JP3499498B2 - Induction heat treatment equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heat treatment apparatus for heat-treating a revolved moving part (for example, a pin part) of a work (for example, a crankshaft) having a revolved moving part.

[0002]

2. Description of the Related Art As an induction heat treatment apparatus of this type, there is an induction heat treatment apparatus for quenching a crankshaft as a work.

As a crankshaft, for 2 cylinders, 3
There are cylinders, 4 cylinders, 6 cylinders, and the like. For example, as shown in FIG. 2 (schematic front view), a four-cylinder crankshaft has four pin portions P1 to P4 provided at intervals in the central axis direction and between the pin portions P1 to P4. And journal portions J1 to J5 respectively provided outside the pin portions P1 and P4 at both ends. The four pin parts P
1 to P4 are eccentric with respect to the central axis, and the phases of the two pin portions P1 and P4 at both ends are the center two pin portions P.
2, 180 degrees out of phase with P3.

Although not shown, the six-cylinder crankshaft has, for example, six pin portions provided at intervals in the central axis direction and outside the pin portions between the pin portions and at both ends. Some have their own journal sections. The six pin portions are eccentric with respect to the central axis, and the phase of each pin portion is relatively 120 °.
Deviated. In the case of a 6-cylinder crankshaft,
The journal parts other than the journal parts at both ends may not be provided in some cases. Further, the phase shift is 12
There may be a predetermined angle other than 0 °.

In some induction heat treatment apparatuses for quenching such a crankshaft, the pin portion (or journal portion) of the crankshaft is quenched once or in a plurality of times. Further, the pin portion and the journal portion may be simultaneously quenched.

[0006] A conventional induction heat treatment apparatus for quenching a pin portion is provided with a quenching mechanism for induction hardening a crankshaft as a work and a quenching mechanism provided below the quenching mechanism. A work holding / rotating mechanism for holding and rotating, a sensor for detecting the position of the pin portion of the work rotated by the work holding / rotating mechanism, and a work A work loading / unloading mechanism for loading / unloading and a control unit for controlling these are provided.

The quenching mechanism includes a heat treatment unit for subjecting the work held by the work holding / rotating mechanism to induction hardening, and a high frequency power source connected to the heat treatment unit.

In the case of an induction heat treatment apparatus in which the pin portion of the crankshaft is quenched once, a plurality of high frequency power supplies are provided. On the other hand, in the case of an induction heat treatment device in which the pin portion of the crankshaft is quenched multiple times,
When the quenching mechanism is provided with a shift mechanism for shifting the heat treatment unit in the axial direction of the work (so-called coil shift system), and the work holding / rotating mechanism described later is provided with the shift mechanism. In some cases (so-called work shift system), a switch for switching between a plurality of heat treatment units described later and the high frequency power source may be provided instead of providing the shift mechanism. In any case, one high frequency power source, at the same time,
Power is supplied to the pin portions in the same phase.

The heat treatment unit follows a plurality of heat treatment portions arranged side by side and the suspended heat treatment portions so as to follow the rotation and revolution of the pin portion of the workpiece as described later. And a moving mechanism.

The heat treatment section includes a high frequency heating coil body,
A cooling jacket provided on the lower side of the high-frequency heating coil body and a disc-type output transformer and the like provided on the upper side of the high-frequency heating coil body are integrated in a vertically long shape. is there. For example, in the case of an induction heat treatment apparatus configured to cope with quenching of a pin portion of a four-cylinder crankshaft, four heat treatment portions (two or less if a shift mechanism is provided) are provided. Has been.

The high-frequency heating coil body is a so-called semi-open saddle type coil, and a plurality of protrusions (usually upper, diagonally upper right and diagonally upper left 3) are provided inward of the semi-open saddle type coil.
Three) spacers. The spacer abuts on the pin portion of the work to keep the space between the semi-open saddle type coil and the pin portion of the work constant, and when the work is rotated by the work holding / rotating mechanism, the pin is pinned. It functions to follow the semi-open saddle type coil as the part rotates and revolves.

In the unit following movement mechanism, the semi-open saddle type coil of the heat treatment section is covered from above the pin section of the work through the spacer so as to face the pin section of the work at the time of the following. It is moved in two directions perpendicular to the central axis of the. The upper side mechanism of the unit following movement mechanism has a chain and a sprocket, and a tension spring provided on the upstream side of the chain. The tension spring is provided so as to pull up the heat treatment portion because the pin portion may be damaged if the weight of the heat treatment portion is applied to the pin portion of the work as it is, and the life of the spacer is shortened. .
As a result, an appropriate weight is applied to the pin portion of the work. During the following, the heat treatment section makes a circular motion that makes one rotation each time the pin section of the work makes one revolution movement.

The lower side mechanism of the unit following movement mechanism includes a substantially horizontal swingable suspension arm whose one end is rotatably connected to a frame of the high frequency heat treatment apparatus by a shaft, and the heat treatment unit. A frame is rotatably attached to the tip end side of the suspension arm.

The work holding / rotating mechanism includes a chuck mechanism for holding and rotating one side of the work, a center unit for holding the center of the other side of the work, and a predetermined pin portion of the work (whichever is acceptable. For example, it has a detection unit that detects that a pin portion at one end) reaches a predetermined initial set angle. The work holding / rotating mechanism has a predetermined speed (for example, 1 second) during the heating period of the work (for example, about 12 seconds).
The work is rotated a predetermined number of times (for example, about 6 times) in 2 seconds of rotation.

The sensor is Japanese Patent Publication No. 05-01576.
As described in Japanese Patent Publication No. 6, a non-contact type limit switch for detecting that the pin portion of the work to be revolved or the like has reached each predetermined reference position, and the rotation angle of the pin portion are detected. Therefore, it has a rotary encoder coaxially connected to the work holding / rotating mechanism. The predetermined reference positions are the energization start position, the energization stop position, the position at which the normal power (first power) is switched to the power in the power reduction state (second power), and the power in the power reduction state is switched to the normal power. It is the position to return. The limit switches are respectively provided at positions facing each other when the pin portion of the work to be revolved or the like comes to each of the predetermined reference positions.

The limit switch may be provided so as to face each pin portion, or may be provided so as to face a part of the pin portions. The case of being provided so as to face a part of the pin portions means that there are two or more pin portions having the same phase, and the pin portions having the same phase are simultaneously supplied with power from one high frequency power source. In this case, the crankshafts of different cylinders are not processed by the same high-frequency heat treatment apparatus, and the dedicated crankshaft machine of any cylinder is used.

As a part of its function, the control section controls the heating of the work based on the output of the sensor. That is, the control unit gives an instruction regarding energization to the high-frequency power source and an instruction regarding the rotation of the workpiece holding / rotating mechanism during the heating of the workpiece.

The instruction regarding the energization is performed as follows. When it is detected that the pin portion has reached the energization start position, energization is started. After that, when it detects that the pin has come to the position to switch from the normal power to the power reduction state power, it switches from the normal power to the power reduction state power and then to the position to return from the power reduction state power to the normal power. When it detects that the unit has arrived, the power in the power reduction state is returned to the normal power. After such a state after the start of the energization is performed while the work is being rotated the predetermined number of times, the energization is stopped when the pin portion is detected to reach the energization stop position.

As can be seen from FIG. 2, the power is switched to the power reduction state, when the pin is at the top dead center, the heat mass on the upper side of the pin is at the bottom dead center. This is because it is smaller than the heat mass on the upper side of the pin portion at the time. That is, in order to make the depth of the hardened layer after quenching on the outer peripheral surface of the pin portion uniform, the top portion of the pin portion does not overheat so that the upper side of the pin portion does not overheat when the pin portion is at the top dead center. The electric power in the power reduction state is set when it is within a predetermined angle before and after the point (for example, within about ± 60 °).

[0020]

However, when the extension spring is replaced, for example, when the unit follow-up moving mechanism is overhauled, the elasticity of the extension spring after replacement is stronger than that before exchange. When the pin portion is on the bottom dead center side, a gap may be formed between the pin portion and the tip of the spacer of the high-frequency heating coil body of the heat treatment section placed on the pin portion. A gap similar to the gap may be created when the chain is replaced. In addition to overhaul, forget that the length of the chain should be adjusted when starting another work in which the work size (size in the direction orthogonal to the central axis of the crankshaft) is smaller. If not, a gap similar to the above gap can be created.

As described above, due to human error, the above-mentioned gap can be formed in the stage before the start of heating, and the same gap as the above-mentioned gap can be formed during the heating period due to the following causes.

As described above, when the so-called power reduction operation for making the electric power in the power reduction state is performed, the depth of the quench hardened layer on the pin portion becomes more appropriate on the entire outer peripheral surface of the pin portion, and the crankshaft Distortion can also be suppressed. However, the shape of the crankshaft is not at least symmetrical with respect to the rotation axis at the top and the bottom, as shown in FIG. 2, for example, and although it is not shown in FIG. Since it has a complicated shape, it is not bilaterally symmetrical, so the crankshaft will become complicated and gradually distorted during the heating period.

On the other hand, since the weight applied by the heat treatment section is adjusted by the tension spring for the above-mentioned reason, when the pin section is moved to the bottom dead center side due to the distortion or the like, the heat treatment section is It may get caught on the way and may not follow the pin part. In this case, the heat treatment part does not go down to the position where it should originally go down, so a gap similar to the above gap can be formed.

As described above, the gap is formed due to various reasons. However, if this gap is large, a defective work piece can be formed. In addition, in the case of the cause due to the human error, since it is in the stage before the start of heating, if the mistake is noticed before the start of heating, it is not necessary to generate a defective work due to such a cause. However, even if the human error is made, the conventional high-frequency heat treatment apparatus does not have means for detecting the error and giving a warning, so that it cannot be prevented in advance. Further, when a defective work is created due to the above-mentioned cause, it is desirable to be able to eliminate it. However, the conventional high-frequency heat treatment apparatus does not have a means for detecting and notifying the occurrence of the defective work due to the above-mentioned cause. Therefore, the above exclusion could not be performed.

A main object of the present invention is to enable a so-called power reduction operation by a means different from the conventional one, and at the same time, prevent the generation of a defective work piece by the above-mentioned other means and reduce it. An object of the present invention is to provide an induction heat treatment apparatus capable of eliminating the work.

[0026]

In order to solve the above problems, in the high frequency heat treatment apparatus according to claim 1 of the present invention, a heat treatment section having a high frequency heating coil body is hung and movable. When the work is rotated, the heat treatment section placed on the revolution-moving portion of the work heats the outer peripheral surface of the revolution-moving portion while making a circular motion together with the revolution-moving portion, and in the process of heating. , Each time it is detected that the heat treatment unit has reached the reference position, the power to be applied to the heat treatment unit is set to a first power and a first power smaller than the first power within one cycle of the circular motion. In the high-frequency heat treatment apparatus for switching to the electric power of 2, a displacement sensor unit for detecting the vertical displacement of the heat treatment unit placed on the revolved moving unit, and the heat treatment unit based on the output of the displacement sensor unit. The reference position Detects that came, and a monitoring control unit that controls switching between the second power and the first power on the basis of the detection result.

In the above-mentioned high-frequency heat treatment apparatus, the monitoring control section may determine whether the distance between the high-frequency heating coil body and the revolved moving section is within a normal range or outside the normal range based on the output of the displacement sensor section. It is determined whether or not there is an alarm, and if it is determined to be outside the normal range, an alarm is issued.

A high-frequency heat treatment apparatus according to a second aspect of the present invention is the high-frequency heat treatment apparatus according to the first aspect, wherein the heat-treatment section is set to the revolved moving section located at a bottom dead center, or , With respect to the heat treatment section, the revolved moving section is set so as to be positioned at bottom dead center,
And when the setting by any one is completed, it has a set control unit that sends a completion signal to the monitoring control unit, and the monitoring control unit, upon receiving the completion signal, performs the determination at least before the heating process. To do.

A high-frequency heat treatment apparatus according to a third aspect of the present invention is the high-frequency heat treatment apparatus according to the second aspect , wherein the monitoring control unit makes the determination also in the heating process.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION An induction heat treatment apparatus according to an embodiment of the present invention will be described below with reference to FIGS.
1 is a schematic explanatory view showing an induction heat treatment apparatus according to an embodiment of the present invention, FIG. 2 is a schematic front view showing a crankshaft for four cylinders as an example of a crankshaft as a work, and FIG. 3 is a schematic view of the present invention. FIG. 4 is a schematic explanatory view showing another example of the induction heat treatment apparatus according to the embodiment, FIG. 4 is a schematic explanatory view showing another example of the induction heat treatment apparatus according to the embodiment of the present invention, and FIG. It is a schematic explanatory drawing which shows another Example of the high frequency heat processing apparatus which concerns on embodiment of this invention.

The induction heat treatment apparatus according to the embodiment of the present invention is a so-called induction hardening apparatus for hardening a crankshaft as a work. The induction heat treatment apparatus may be capable of quenching not only the crankshaft pin portion but also the journal portion, but since the quenching mechanism of the journal portion may be the same as the conventional one, illustration and description thereof will be omitted. Description will be made assuming that the part is quenched. It is assumed that the crankshaft compatible with this high-frequency heat treatment apparatus is a crankshaft for four cylinders or less. However,
By changing the number of heat treatment parts, etc., which will be described later, it is possible to support any number of cylinder crankshafts.

The difference between the high-frequency heat treatment apparatus according to the embodiment of the present invention and the conventional high-frequency heat treatment apparatus is that a displacement sensor unit 610 described later is provided instead of the sensor, and a control unit (not shown) described later is accordingly provided. The point is that the function of has been changed.

In the following, as the induction heat treatment apparatus according to the embodiment of the present invention, in the case of [1] work shift system, there is one heat treatment unit, and [2] work shift system, In case of two parts, [3] coil shift system, [4] no shift mechanism and two or more hardening stations,
[5] In the case where there is no shift mechanism and there is only one quenching station, and [6] when the quenching mechanism of the journal section is provided with a displacement sensor section 610 to be described later, etc. explain.

[1] An induction heat treatment apparatus A according to a first embodiment of the present invention is of a work shift type in which a work holding / rotating mechanism, which will be described later, is provided with a shift mechanism. As shown in FIG.
One heat treatment unit 100 having 0 is hung and movable, and a crankshaft W as a work.
When the crankshaft W is rotated (see also FIG. 2), the pin portion P1 (or P2, P3, P) as the revolved moving portion of the crankshaft W is rotated.
4) heat-treating part 100 placed on 4) circularly moves with the pin part P1 (or P2, P3, P4) to heat the outer peripheral surface of the pin part P1 (or P2, P3, P4), and In the process, every time it is detected that the heat treatment unit 100 has reached the reference position, the power to be given to the heat treatment unit 100 is changed to the normal power as the first power and the normal power within one cycle of the circular motion. The power is switched to the power in the power reduction state as the second power smaller than the power.

The high-frequency heat treatment apparatus A is based on a displacement sensor unit 610 for detecting the vertical displacement of the heat treatment unit 100 placed on the pin P1 (or P2, P3, P4) and the output of this displacement sensor unit 610. Heat treatment section 100
Is provided with a monitoring control unit (not shown) that performs control to switch between the normal power and the power in the power reduction state based on the detection result.

Further, in the high-frequency heat treatment apparatus A, the monitor control section is based on the output of the displacement sensor section 610 and the high-frequency heating coil body 110 and the pin section P1 (or P2, P2).
(3, P4) is determined to be within the normal range or outside the normal range, and an alarm is issued when it is determined to be outside the normal range.

Further, the induction heat treatment apparatus A includes the heat treatment unit 1
00, the pin portion P1 (or P2, P3, P4) is set so as to be positioned at the bottom dead center, and when the setting is completed, a completion control signal is sent to the monitoring control unit (illustration: When the completion signal is received, the monitoring control unit performs the determination at least before the heating process (heating period).

Further, the high frequency heat treatment apparatus A is characterized in that the monitoring controller also makes the determination in the heating process.

The high-frequency heat treatment apparatus A having such characteristics has the following structure, more specifically.

The induction heat treatment apparatus A includes a quenching mechanism 10 for induction hardening the crankshaft W, and the quenching mechanism 10.
A work holding / rotating mechanism (not shown) that is provided below the workpiece and holds and rotates the crankshaft W during quenching work.
And the pin portion P1 (or P2, P of the crankshaft W)
3 and P4), the displacement sensor mechanism 600 has a displacement sensor unit 610 for detecting the vertical displacement of the heat treatment unit 100 of the quenching mechanism 10, and the loading / unloading of the workpiece with respect to the workpiece holding / rotating mechanism. A work loading / unloading mechanism for
The high-frequency heat treatment apparatus A includes an alarm device (not shown) that issues an alarm when it is in an abnormal state, and a control unit (not shown) that controls these.

The quenching mechanism 10 includes a heat treatment unit 50 for induction hardening the crankshaft W held by the work holding / rotating mechanism, and the heat treatment unit 50.
And a high frequency power source (stored inside the device frame 5) connected via the flexible lead 25.

The heat treatment unit 50 includes a heat treatment unit 100.
And a unit follow-up moving mechanism 200 for making the heat treatment section 100 follow the rotation and revolution of the pin portion P1 (or P2, P3, P4) of the crankshaft W as described later.
And have.

The heat treatment section 100 comprises a high frequency heating coil body 1
10, a cooling jacket (not shown) provided on the lower side of the high frequency heating coil body 110, and a disk-type output transformer 120 and the like provided on the upper side of the high frequency heating coil body 110 are arranged in the vertical direction. It is one.

The high frequency heating coil body 110 includes a so-called semi-open saddle type coil 111 and the semi-open saddle type coil 1.
It has three spacers 112 projecting from the inside of 11. The spacer 112 contacts the pin portion P1 (or P2, P3, P4) of the crankshaft W,
When the space between the semi-open saddle type coil 111 and the pin portion P1 (or P2, P3, P4) of the crankshaft W is made constant, and when the crankshaft W is rotated by the work holding / rotating mechanism. , Pin portions P1, P2, P
Half-open saddle type coil 1 for P3 to rotate and revolve
11 to follow.

In the unit following movement mechanism 200, the semi-open saddle type coil 111 of the heat treatment section 100 is connected to the pin portion P1 (or P2, P3, P of the crankshaft W) during the following.
4) is covered from above the pin portion P1 (or P2, P3, P4) via the spacer 112,
The crankshaft W is moved in two directions at right angles to the central axis of the crankshaft W. The upper side mechanism of the unit following movement mechanism 200 includes a chain 210 and a sprocket 22.
0 and a tension spring 230 provided on the upstream side of the chain 210.

One end of the tension spring 230 is fixed to the apparatus frame 5. The tension spring 230 applies the weight of the heat treatment unit 100 to the pin portion P1 (or P2, P3, P4).
If it is applied to the pin P1 (or P2, P
3, P4) may be damaged, and the spacer 11
Since the life of the heat treatment part 2 becomes short, the heat treatment part 100 is provided so as to be pulled up. Thereby, an appropriate weight is applied to the pin portion P1 (or P2, P3, P4). During the following, the heat treatment unit 100 makes a circular motion that makes one rotation each time the pin portion P1 (or P2, P3, P4) makes one revolution movement.

The lower side mechanism of the unit following movement mechanism 200 is a substantially horizontal swingable suspension arm 250 whose one end is rotatably connected to the apparatus frame 5 by a shaft 255.
The heat treatment unit 100 has a frame 260 rotatably attached to the tip end side of the suspension arm 250.
Between the suspension arm 250 and the chain 210, a shaft body 256 to which one end side of the chain 210 is fixed, and a support body 257 that rotatably supports the shaft body 256 are provided. Between the suspension arm 250 and the frame 260, the shaft body 2 to which the upper end of the frame 260 is fixed
58 and a support body 2 for rotatably supporting the shaft body 258.
59 and 59 are provided.

The high frequency power source is a transistor inverter. That is, the high frequency power supply is composed of six thyristors (forward converter) which are connected to an external 50 Hz or 60 Hz three-phase AC power supply through three coupling capacitors.
, Two DC chokes on the downstream side, four power transistors (inverse conversion section) on the downstream side, a voltage / power control input terminal connected to each gate of the six thyristors, and this voltage / power The control input terminal has a heating on / off portion for setting a voltage for turning on / off the high frequency power source.

The voltage / power control input terminal is also connected to a D / A conversion card of a control unit described later. The heating on / off section is also connected to an output card of the control section described later. As a result, the high frequency power supply operates as follows according to an instruction from the control unit described later.

In order to turn on the high frequency power source, it is necessary to once set the oscillation stabilizing voltage. Therefore, when the high-frequency power source is turned on, the control unit, which will be described later, instructs the heating on / off section to turn on the power. Upon receiving this instruction, the heating on / off section
Output the voltage set to the oscillation stabilization voltage to the power control input terminal. This instruction raises the oscillation stable voltage.

After the oscillation is stabilized in this way, a voltage for setting the normal power to the voltage / power control input terminal via the D / A conversion card or a command from the control unit to be described later. When a voltage for setting the power in the power reduction state is applied, the high frequency power supply outputs the output voltage at the normal power or the output voltage at the power in the power reduction state.

The work holding / rotating mechanism is a general one having a swing arm mechanism and a shift mechanism for shifting the swing arm mechanism in the front-back direction of the plane of FIG.

The swing arm mechanism has a substantially U-shaped swing arm, a drive unit (for example, an index unit) for swinging the swing arm, and a holding unit provided at the tip of the swing arm so as to face each other. And a rotating portion. The holding / rotating portion is provided on one side of the tip end of the swing arm, and is provided on the crankshaft W
A chuck mechanism that grips and rotates one side of
A center unit provided on the other side of the tip of the swing arm for holding the center of the other side of the crankshaft W and a predetermined pin portion of the crankshaft W (whichever is acceptable, for example, the pin portion P1 at one end) are predetermined. It has an initial set angle and a detection unit that detects when the initial set angle is reached after shifting.

The shift mechanism includes a rail-equipped base portion fixed to the floor surface to which the high-frequency heat treatment apparatus A is fixed, a slider sliding on the rail-equipped base portion, and the rail-equipped base portion and the slider. And a drive mechanism provided in the. The drive mechanism is a drive unit fixed to one end of the rail-equipped base portion, a support body fixed to the other end of the rail-equipped base portion, and between the drive unit and the support body,
And a ball screw mechanism attached to the base portion with rails. The swing arm mechanism is attached to the slider.

The maximum shift length of the shift mechanism is the distance between the pin portion at one end and the pin portion at the other end of the longest crankshaft W to which the high frequency heat treatment apparatus A corresponds. The chuck mechanism and the center unit are the induction heat treatment apparatus A.
The respective tip end portions are movable so as to hold the longest crankshaft W and the shortest crankshaft W, respectively.

The displacement sensor mechanism 600 includes the heat treatment unit 10.
Displacement sensor unit 610 that detects displacement of 0 in the vertical direction
A suspension frame 630 for fixing the displacement sensor unit 610 to the apparatus frame 5, and the displacement sensor unit 61.
The wire 620 is provided between the tip of the movable part 611 of No. 0 and the shaft 256. Displacement sensor section 61
0 is a linear sensor such as a linear scale, a magnescale, a potentiometer, and a differential transformer, as long as it can detect the displacement of the heat treatment unit 100 in the vertical direction. In the displacement sensor unit 610, the tip of the movable unit 611 is
It is fixed to the shaft body 256 via the wire 700,
The vertical displacement of the heat treatment unit 100 is indirectly detected.

Therefore, the displacement sensor section 610 at the timing when the pin portion P1 (or P2, P3, P4) on which the high-frequency heating coil body 110 is placed stops at the bottom dead center or when the pin portion passes the bottom dead center. Based on the output from the high frequency heating coil body 110 and the pin portion P1 (or P2, P
3, P4), it is possible to detect what the distance is at bottom dead center.

Further, if the shape information of the crankshaft W is given to the monitoring control unit described later in advance, the high frequency heating coil body 110 is not limited to the bottom dead center and may be located on the top dead center side from the bottom dead center. The distance between the high frequency heating coil body 110 and the pin portion P1 (or P2, P3, P4) on which it is placed can be detected. However, at the bottom dead center, it is most likely that the high frequency heating coil body 110 does not follow the pin portion P1 (or P2, P3, P4) on which the high frequency heating coil body 110 is placed. The detection at is sufficient. It is also possible to reduce the monitoring load on the monitoring control unit described later.

If the monitoring control unit described later determines that the distance at the bottom dead center is within the normal range, and the distance at the next bottom dead center is also within the normal range,
At least during this period, and at least until after reaching the top dead center after passing through the bottom dead center, the output from the displacement sensor unit 610 can be treated as being correct. Therefore, if the shape information of the crankshaft W is given to the monitoring control unit described later in advance, for example, the energization start position, the energization stop position, and the power reduction state from the normal power are calculated based on the output from the displacement sensor unit 610. It is possible to detect the above-mentioned four positions, that is, a position at which the power is switched to the power and a position at which the power in the power reduction state is returned to the normal power.

The alarm device is an alarm sound generator including a speaker for emitting an alarm sound to the operator and an alarm light for emitting an alarm light to the operator.
The alarm device is connected to an output card of the control unit described later.

The control section is composed of a sequencer. That is, the control unit has a CPU card, an A / D conversion card, a D / A conversion card, an input card, and an output card. The CPU card has a CPU, a memory, a timer and the like. In the memory of the CPU card, set control software is stored in the memory of the CPU card so as to perform a part of the function of the control unit, and the monitor control software stores the monitor control unit. It is remembered. Other general control software is also stored in the memory of the CPU card.

As described above, the set control unit has the pin portion P1 (or P2, P3, P4) for the heat treatment unit 100.
Is set so as to be positioned at the bottom dead center, and when the setting is completed, a completion signal is sent to the monitoring controller. Specifically, the set control unit causes the work loading / unloading mechanism and the work holding / rotating mechanism to perform, for example, the following series of setting operations for the pin portions P1 to P4.

First, the setting operation for the pin portion P1 is as follows. From the work loading / unloading mechanism, the work holding /
The crankshaft W is loaded into the rotating mechanism. The crankshaft W is held by the work holding / rotating mechanism holding / rotating portion. The crankshaft W is rotated by the holding / rotating portion so that the detection portion of the work holding / rotating mechanism causes the predetermined pin portion P to move.
When it is detected that 1 reaches a predetermined initial set angle, the rotation of the holding / rotating portion is stopped. The predetermined initial set angle is a state in which the pin portion P1 and the pin portion P2 have the same height as shown in FIG. 1, and the pin portion P1 is on the left side of the pin portion P2 in FIG. .

The swing arm of the work holding / rotating mechanism is swung 90 ° toward the heat treatment section 100. Then, the pin portion P1 of the swung crankshaft W is brought to the position of the bottom dead center, brought into contact with the three spacers 112 of the heat treatment portion 100, and the heat treatment portion 100 is placed on the pin portion P1. Becomes However, the chain 21
If the adjustment of 0 or the like is incomplete, a gap may be formed between the tip of the spacer 112 and the pin portion P1. Since the setting of the pin portion P1 is completed, the set control unit sends a completion signal to the monitoring control unit.

The set control unit continues to operate even after the hardening of the pin P1 is completed according to an instruction from the monitoring control unit described later.
In order to set 2 in the heat treatment section 100, the following setting operation is performed.

The swing arm of the work holding / rotating mechanism is swung in the opposite direction to the heat treatment section 100 by a predetermined angle. The constant angle may be 90 °, but may be smaller than 90 ° as long as the crankshaft W is not rotated and the crankshaft W does not come into contact with the heat treatment section 100 after the reverse swing. At the position after the reverse swing, the shift mechanism of the work holding / rotating mechanism is operated to move the swing arm mechanism to the pin portion P for the pitch between the pin portion P1 and the pin portion P2.
Shift to 2 side. This allows the crankshaft W
Is shifted to the pin portion P2 side by the pitch.

When the crankshaft W is rotated by the holding / rotating portion, the detection portion of the work holding / rotating mechanism causes the predetermined pin portion P1 to have a predetermined first post-shift initial set angle (the predetermined initial set angle). When it is detected that the angle becomes 180 ° from the angle, the rotation of the holding / rotating portion is stopped. The swing arm of the work holding / rotating mechanism is swung forward in the direction of the heat treatment unit 100 by the angle swung reversely.

Then, the pin portion P2 of the swung crankshaft W is brought to the position of the bottom dead center and brought into contact with the three spacers 112 of the heat treatment portion 100, and the heat treatment portion 100 is placed on the pin portion P2. It will be in a damaged state. However, if the adjustment of the chain 210 or the like is incomplete as described above, a gap may be formed between the tip of the spacer 112 and the pin portion P2. Since the setting of the pin portion P2 is completed, the set control unit sends a completion signal to the monitoring control unit.

The setting control section performs the following setting operation in order to set the pin section P3 in the heat treatment section 100 even after the hardening of the pin section P2 is completed according to the instruction of the monitoring control section.

The swing arm of the work holding / rotating mechanism is swung in the opposite direction to the heat treatment section 100 by the same angle as the above-mentioned fixed angle. At the position after the reverse swing, the shift mechanism of the work holding / rotating mechanism is operated to shift the swing arm mechanism to the pin portion P3 side by the pitch between the pin portions P2 and P3. As a result, the crankshaft W is shifted to the pin portion P3 side by the pitch.

Since the pin portion P2 and the pin portion P3 are in the same phase, the rotation after the shift is unnecessary. The swing arm of the work holding / rotating mechanism is swung forward in the direction of the heat treatment unit 100 by the angle swung reversely. Then, the pin portion P3 of the swung crankshaft W is brought to the position of the bottom dead center, brought into contact with the three spacers 112 of the heat treatment portion 100, and the heat treatment portion 100 is placed on the pin portion P3. Becomes However, if the adjustment of the chain 210 or the like is incomplete as described above, a gap may be formed between the tip of the spacer 112 and the pin portion P3. Since the setting of the pin portion P3 is completed, the set control unit sends a completion signal to the monitoring control unit.

The setting control section performs the following setting operation in order to set the pin section P4 in the heat treatment section 100 even after the hardening of the pin section P3 is completed according to the instruction of the monitoring control section.

The swing arm of the work holding / rotating mechanism is swung in the opposite direction to the heat treatment section 100 by the same angle as the above-mentioned fixed angle. At the position after the reverse swing, the shift mechanism of the work holding / rotating mechanism is operated to shift the swing arm mechanism to the pin portion P4 side by the pitch between the pin portions P3 and P4. As a result, the crankshaft W is shifted to the pin portion P4 side by the pitch.

When the crankshaft W is rotated by the holding / rotating portion, the detecting portion of the work holding / rotating mechanism causes the predetermined pin portion P1 to have the predetermined second post-shift initial set angle (the predetermined initial setting). Angle (the same angle as the angle) is detected,
Stop the rotation of the holding / rotating part. The swing arm of the work holding / rotating mechanism is swung forward in the direction of the heat treatment unit 100 by the angle swung reversely. Then, the pin portion P of the swung crankshaft W
4 is brought to the position of the bottom dead center, brought into contact with the three spacers 112 of the heat treatment section 100, and the heat treatment section 100 is placed on the pin portion P4. However, if the adjustment of the chain 210 or the like is incomplete as described above, the spacer 1
There may be a gap between the tip of 12 and the pin portion P4. This completes the setting of the pin portion P4, so the set control section sends a completion signal to the monitoring control section.

As a part of its function, the monitoring control section has a normal distance range between the high frequency heating coil body 110 and the pin section P1 (or P2, P3, P4) based on the output of the displacement sensor section 610. It judges whether it is within the normal range or outside the normal range, and when it is judged that it is outside the normal range, an alarm is issued. More specifically, when the monitoring control unit receives the completion signal, the displacement sensor unit 610 is provided before at least the heating process for at least the pin units P1 to P4.
It is determined whether the distance between the high frequency heating coil body 110 and the pin portion P1 (or P2, P3, P4) is within the normal range or outside the normal range based on the output of When the determination is made, it has a function of instructing the alarm device to issue an alarm, and before or after the alarm, it usually has a function of stopping the high-frequency heat treatment apparatus A.

This stop is automatically performed by the monitor control unit. Of course, the stop may be performed manually. After stopping in this way, the operator can inspect the high-frequency heat treatment apparatus A and adjust the mounting position of the tension spring 230 and the like to correct the problem of the distance. As a result, with respect to the crankshaft W before the heat treatment, the defect of the distance can be corrected, so that the crankshaft W does not become a defective product due to the defect of the distance before the heat treatment. That is, it is possible to automatically detect the defect of the distance before the heat treatment in advance and prevent the generation of the defective crankshaft W.

In the heating process, the monitoring control unit detects that the heat treatment unit 100 has reached the reference position (that is, the four positions) based on the output of the displacement sensor unit 610. Control for switching between the normal power and the power in the power reduction state based on the detection result is performed to the voltage / power control input terminal of the high frequency power supply via the D / A conversion card, and the work is held / rotated. It also gives instructions regarding rotation of the mechanism. The rotation instruction means the crankshaft W
During the heating period (for example, about 12 seconds), the crankshaft W is rotated at a predetermined speed (for example, one rotation and 2 seconds) a predetermined number of times (for example, about 6 times).

Therefore, a so-called power reduction operation is also performed by the output of the monitoring control section and the displacement sensor section 610.

Further, the monitoring control section makes the above determination also in the heating process, and when it determines that the temperature is out of the normal range, it instructs the alarm device to issue an alarm, and before and after this alarm. Usually, it also has a function of stopping the high-frequency heat treatment apparatus A.

Therefore, even if the distance defect happens to occur in the heating process, the monitoring control unit automatically finds the distance defect and stops the high-frequency heat treatment apparatus A. Shaft W
Can be properly excluded.

Whether the distance between the high frequency heating coil body 110 and the pin portion P1 (or P2, P3, P4) based on the output of the displacement sensor unit 610 is within the normal range or outside the normal range. The determination is made by comparing with a value in a normal range registered as table data in advance in the nonvolatile memory of the CPU card.

The value of the normal range is determined with a certain allowance in consideration of mechanical errors such as an operation error of the swing arm and the like, an abrasion error of the spacer 112, and a manufacturing error of the crankshaft W. Also, since the distance is detected during the heating period of the crankshaft W, it is also considered that the crankshaft W is gradually distorted during the heating period. Further, the value in the normal range may be a constant value in consideration of the distortion, but may be a different value every time the bottom dead center is passed, and fine control may be performed.

If it is desired that the vertical position adjustment of the displacement sensor unit 610 is not necessary even if the size of the crankshaft W (the size in the direction orthogonal to the central axis of the crankshaft W) changes, then the high frequency heat treatment apparatus A is used. The vertical position of the displacement sensor unit 610 is adjusted by the crankshaft W having the smallest size for quenching, and the movable unit 611 of the displacement sensor unit 610 is displaceable even by the crankshaft W having the largest size. do it.

The table data is data on basic crankshafts of different sizes registered in advance. As for the table data, of course, data relating to a crankshaft that has not been registered can be registered at any time as needed. Such a table data method is preferable in terms of work efficiency because the adjustment time when starting the quenching work of the crankshafts of different sizes can be shortened as compared with the conventional case. In the case of the conventional high-frequency heat treatment equipment that used limit switches, when entering the quenching work of the crankshafts of different sizes,
This is because it was necessary to adjust the position of the limit switch.

Induction heat treatment apparatus A thus constructed
Works as follows:

When the crankshaft W is supplied to the work holding / rotating mechanism by the work loading / unloading mechanism,
The holding / rotating portion of the workpiece holding / rotating mechanism receives and holds the crankshaft W. The crankshaft W is rotated by the holding / rotating portion, and when the predetermined pin portion P1 reaches a predetermined initial set angle, the rotation is stopped. The swing arm swings toward the heat treatment unit 100, and the crankshaft W is brought into contact with the three spacers 112 of the heat treatment unit 100 with the pin portion P1 at the bottom dead center position.
That is, the heat treatment part 100 is attached to the pin part P1 located at the bottom dead center.
Is placed. However, there may be a gap as described above. The set control unit sends a completion signal to the monitoring control unit.

Upon receipt of this completion signal, the supervisory control unit
Before heating the pin P1, the displacement sensor unit 6
Based on the output of 10, it is determined whether the distance between the high frequency heating coil body 110 and the pin portion P1 is within the normal range or outside the normal range, and when it is determined that the distance is outside the normal range, an alarm is issued. Induction heat treatment equipment A
To stop. The operator inspects the high-frequency heat treatment apparatus A and adjusts the attachment position of the tension spring 230 and the like to correct the problem of the distance. After the correction, when the operator restarts the high frequency heat treatment apparatus A, the pin portion P
The process of heating for 1 is performed. On the other hand, even when the determination is within the normal range, the process of heating the pin portion P1 is started.

The holding / rotating portion rotates the crankshaft W a predetermined number of times at a predetermined speed. At this time, when it is detected that the heat treatment unit 100 placed on the pin P1 has passed the energization start position based on the output of the displacement sensor unit 610, the monitoring control unit instructs the high frequency power supply to supply the normal power. Energization is started. When the pin P1 is at the bottom dead center as the energization start position, energization of normal power is started at the stage of transition to the heating process.

During the heating period, when it is detected based on the output of the displacement sensor section 610 that the heat treatment section 100 placed on the pin section P1 has passed the position for switching from the normal power to the power in the power reduction state, The power is switched from normal power to power in the power reduction state. After that, during the heating period, based on the output of the displacement sensor unit 610, it is detected that the heat treatment unit 100 placed on the pin P1 has passed the position where the power in the power reduction state is returned to the normal power. , The power in the power reduction state is switched to the normal power.

Based on the output of the displacement sensor section 610 a predetermined number of times, the heat treatment section 100 placed on the pin section P1.
Has been detected to have passed the position where the normal power is switched to the power in the power reduction state, and then, based on the output of the displacement sensor unit 610, the heat treatment unit 100 placed on the pin P1 has reached the energization stop position. When is detected, the energization is stopped. Note that energization may be forcibly performed by measuring the elapsed time from the start of energization with a timer of the control unit. When the energization is stopped, the rotation of the crankshaft W by the holding / rotating portion is stopped.

Further, during the heating period, the monitoring control unit
Based on the output of the displacement sensor unit 610, it is determined whether the distance between the high-frequency heating coil body 110 and the pin portion P1 is within the normal range or outside the normal range, and when it is determined that the distance is outside the normal range. Issues an alarm and stops the high frequency heat treatment apparatus A before and after this. That is, during the heating period, the monitoring control unit compares the output of the displacement sensor unit 610 with the value in the normal range registered as table data to determine the distance between the high frequency heating coil body 110 and the pin portion P1. Is within the normal range or out of the normal range, and if it is determined to be out of the normal range, an alarm is issued, and the induction heat treatment apparatus A is stopped before and after this.

It is desirable that the comparison is performed at the timing when the pin portion P1 passes through the bottom dead center as described above. This timing is given by measuring the elapsed time from the start of energization with the timer of the control unit. The determination may be stopped immediately when it is determined to be outside the normal range at each timing when the pin portion P1 passes through the bottom dead center, or may be determined to be outside the normal range even once even after the heating period has elapsed. If it is done, it may be stopped.

In general, the cooling liquid is jetted from the cooling jacket to quench (ie, cool) the pin portion P1 of the crankshaft W, and then the high frequency heat treatment apparatus A is stopped.
This is because this allows the defective crankshaft W to be taken out immediately.

When stopped, the defective crankshaft W is removed, and the operator adjusts the mounting position of the tension spring 230 and the like of the high-frequency heat treatment apparatus A, if necessary, to correct the problem of the distance. When the operator resets the high frequency heat treatment apparatus A, the initial state is restored.

On the other hand, when the pin portion P1 is hardened without any problem, the pin portion P1 is shifted to the pin portion P2 as described in the set control portion, and the pin portion P2 also has the above-mentioned pin portion P1. The operation is similar to the operation. When the pin portion P2 is hardened without any problem, the pin portion P2 is shifted to the pin portion P3 as described in the set control portion,
The operation of the pin portion P3 is similar to the operation of the pin portion P1 described above. Then, when the pin portion P3 is hardened without any problem, the pin portion P3 is shifted to the pin portion P4 as described in the set control portion, and the pin portion P4 is also operated in the same manner as the above-described pin portion P1. It becomes the operation of.

When the pin portion P4 is hardened without any problem, it means that the crankshaft W has been hardened properly. The swing arm of the work holding / rotating mechanism is reversely swung, and the crankshaft W is paid out to the work loading / unloading mechanism. After that, a new crankshaft W is supplied to the work holding / rotating mechanism by the work loading / unloading mechanism, and the above process is repeated.

However, if the above-mentioned determination of the pin portion P1 before the heating process is within the normal range, the above-mentioned determination should normally be within the normal range even for the pin portions P2 to P4 before the heating process after the shift. If the determination of the pin portion P1 before the heating process is out of the normal range, the operator will readjust it, so that the determination should be within the normal range for the pin portions P2 to P4 before the heating process after the shift. Therefore, the pin portion P before the heating process
The determination in 2 to P4 can be omitted. However, even if the high-frequency heating coil body 110 accidentally rides on a portion other than the pin portions P2 to P4, that is, the journal portion during the setting, it is preferable to detect an abnormality. The determinations in the parts P2 to P4 are usually not omitted. In the following high-frequency heat treatment device, a device that does not omit this description will be described as a representative.

The structure of the induction heat treatment apparatus A according to the first embodiment of the present invention is not limited to that described above. For example, the displacement sensor unit 610 is the heat treatment unit 10.
Anything can be used as long as it can detect the vertical movement of 0. Therefore, a rotary displacement sensor such as a rotary encoder that detects a rotary displacement may be used instead of the linear sensor. in this case,
For example, if the rotational displacement sensor is mounted coaxially with the sprocket 220, the mechanism can be simplified. Further, conventionally, a cylinder mechanism may be provided in place of the tension spring 230, but in this case also, the same as described above is applied.

In the high-frequency heat treatment apparatus A according to the first embodiment of the present invention, the work holding / rotating mechanism has a swing arm mechanism, but it may have an elevating mechanism instead. In this case, the work holding / rotating mechanism swings the crankshaft W or reversely swings in the above-described operation.
It only raises or lowers the crankshaft W.

In the high frequency heat treatment apparatus A according to the first embodiment of the present invention, instead of removing the swing arm mechanism or the lifting mechanism from the work holding / rotating mechanism,
As shown in FIG. 3, a high-frequency heat treatment apparatus A ′ may be provided in which a heat-treatment section side elevating mechanism 700 is provided between the quenching mechanism 10 (excluding the high-frequency power source) and the apparatus frame 5. That is, the displacement sensor unit 6 is added to the conventional high-frequency heat treatment apparatus equipped with the heat treatment unit-side elevating mechanism for setting the heat treatment unit 100 to the pin portion located at the bottom dead center.
10 etc. may be applied.

The heat treatment section-side lifting mechanism 700 includes a rail body (not shown) projecting from the apparatus frame 5, a lifting slider 710 that engages with the rail body, the rail body and the lifting slider 710. And a drive mechanism (not shown) provided therebetween. In the case of the induction heat treatment apparatus A ′, the slider 7 for raising and lowering the heat treatment section side elevation mechanism 700.
A quenching mechanism 10 (excluding the high frequency power source) and a displacement sensor mechanism 600 attached to the quenching mechanism 10 are attached to the quenching mechanism 10.

The set controller of the induction heat treatment apparatus A'is
Due to the above configuration change, the setting control unit of the induction heat treatment apparatus A is slightly different. However, the set control section of the induction heat treatment apparatus A ′ causes the set control section of the induction heat treatment apparatus A to set by the work holding / rotating mechanism so that the pin portion is located at the bottom dead center with respect to the heat treatment section 100. On the other hand, the heat treatment unit 100 is attached to the pin portion located at the bottom dead center
Is changed so that it can be set by the elevating mechanism on the heat treatment section side.

[2] An induction heat treatment apparatus B according to the second embodiment of the present invention is of a work shift type having two heat treatment sections 100 (see FIG. 1). The induction heat treatment apparatus B shifts the crankshaft W by a work holding / rotating mechanism similar to the above-mentioned work holding / rotating mechanism after simultaneously quenching the pin portions P1 and P2, and then rotates the crankshaft W by 180 ° to initialize it. The pin portions P3 and P4 having the same positional relationship as the set pin portions P1 and P2 are simultaneously quenched. Since the pin portions P1 and P2 have a phase difference of 180 ° from each other and cannot be processed by one high-frequency power source, the high-frequency heat treatment apparatus B requires two high-frequency power sources.

Therefore, the induction heat treatment apparatus B has the quenching mechanism 10 and the displacement sensor mechanism 600 in the induction heat treatment apparatus A.
And one and two respectively, and the maximum shift length of the shift mechanism of the work holding / rotating mechanism in the high-frequency heat treatment apparatus A is the longest crankshaft W corresponding pin portion P1 to pin portion of the crankshaft W. The distance is changed to P3.

Further, in the high frequency heat treatment apparatus B, the pitch between the two hardening mechanisms 10 (excluding the high frequency power source) can be changed so as to correspond to different kinds of crankshafts W. There is. Therefore, one quenching mechanism 10 (excluding the high frequency power source) and the displacement sensor mechanism 600 attached to this quenching mechanism 10 are provided.
Is fixed to the apparatus frame 5 as in the case of the induction heat treatment apparatus A, but the other hardening mechanism 10 (however,
Excluding the high frequency power supply. ) And the displacement sensor mechanism 600 attached to the quenching mechanism 10 are the device frame 5
A slide mechanism for pitch adjustment (not shown) is provided between and.

The pitch adjusting slide mechanism has a rail body protruding from the apparatus frame 5, a slider engaging with the rail body, and a drive mechanism provided between the rail body and the slider. This drive mechanism is provided only when the pitch is automatically adjusted by the control unit, but may be the same as the drive mechanism of the work holding / rotating mechanism in the high frequency heat treatment apparatus A. The quenching mechanism 10 (excluding the high frequency power source) and the displacement sensor mechanism 600 attached to the quenching mechanism 10 are fixed to the slider.

Further, in the induction heat treatment apparatus B, the set control unit and the monitoring control unit are partly different from those of the induction heat treatment apparatus A due to the above-mentioned configuration change. However, the monitoring control unit of the induction heat treatment apparatus B is basically the same as that of the induction heat treatment apparatus A, and only the control for the two pin portions is different, so a detailed description thereof will be omitted and the induction heat treatment apparatus will not be described. A brief description will be given below in connection with the B set control unit.

The set controller of the induction heat treatment apparatus B also has a pin portion P1 (or P2, P3,
P4) is set so as to be positioned at the bottom dead center, and when the setting is completed, a completion signal is sent to the monitoring control section. A series of setting operations for the pin portions P1 to P4 to be set by the mechanism are slightly different.

First, the setting operation for the pin portions P1 and P2 is as follows. The crankshaft W is loaded into the work holding / rotating mechanism from the work loading / unloading mechanism. The crankshaft W is held by the work holding / rotating mechanism holding / rotating portion. When the crankshaft W is rotated by the holding / rotating portion and the detection portion of the work holding / rotating mechanism detects that the predetermined pin portion P1 has reached the predetermined initial set angle, the holding / rotating portion operates. Stop rotation.

The swing arm of the work holding / rotating mechanism is swung 90 ° toward the heat treatment section 100. Then, the pin portion P1 of the swung crankshaft W is brought to the position of the bottom dead center, brought into contact with the three spacers 112 of the heat treatment portion 100, and the heat treatment portion 100 is placed on the pin portion P1. Becomes However, the gap may be formed as described above. This is the pin P1
Since the setting for is completed, the set control unit
A completion signal is sent to the monitoring controller. After that, the monitoring control unit makes the determination at least before the heating process.

On the other hand, the heat treatment section 100 is also placed on the pin portion P2, but when the pin portion P1 is at the bottom dead center position, the pin portion P2 is at the top dead center position. Therefore, the determination regarding the pin portion P2 cannot be performed when the pin portion P1 is at the position of the bottom dead center. Therefore, after the above determination, in order to make the determination at the pin portion P2,
The set control unit rotates the crankshaft W by the holding / rotating unit so that the detection unit of the work holding / rotating mechanism causes the predetermined pin portion P1 to be at an angle of 180 ° from the predetermined initial setting angle. Is detected and the rotation of the holding / rotating portion is stopped. That is, at this time, the pin portion P2 is at the bottom dead center. Since the setting of the pin portion P2 is completed by this, the set control portion sends a completion signal to the monitoring control portion. After that, the monitoring control unit makes the determination at least before the heating process.

That is, the monitoring control section makes the above-mentioned determination on the pin portions P1 and P2 at least before the heating process of the pin portions P1 and P2. The monitoring control unit determines the high frequency heating coil body 110 and the pin portion P1 based on the determination of either of the pin portions P1 and P2.
When it is determined that the distance to (or P2) is out of the normal range, the warning device is instructed to issue a warning, and the high frequency heat treatment apparatus B is stopped before and after this warning.
After the stop, the operator inspects the high-frequency heat treatment apparatus B and adjusts the attachment position of the tension spring 230 and the like to correct the problem of the distance. After the correction, when the operator restarts the operation, when the determination at the pin portion P2 is not completed, the operation related to the determination is performed. On the other hand, when the determination at the pin portion P2 is completed, the process proceeds to the process of heating the pin portions P1 and P2, and the operation by the monitoring control unit is performed.

After the hardening of the pin portions P1 and P2 is completed, the set control portion causes the swing arm of the work holding / rotating mechanism to swing in the opposite direction to the heat treatment portion 100 by the same angle as the predetermined angle. At the position after the reverse swing,
The shift mechanism of the work holding / rotating mechanism is operated to shift the swing arm mechanism to the pin portion P3 side by the pitch between the pin portions P1 and P3. As a result, the crankshaft W is shifted to the pin portion P3 side by the pitch.

After that, the set control section rotates the crankshaft W by the holding / rotating section so that the detection section of the work holding / rotating mechanism causes the predetermined pin section P1 to move from the predetermined initial set angle to 180 degrees. When the angle of ° is detected, the rotation of the holding / rotating part is stopped. That is, at this time, the pin portion P3 is at the bottom dead center. After this, the pin portions P3 and P4 are also
This is the same as the pin portions P1 and P2. The other operations are basically the same as those of the high-frequency heat treatment apparatus A, and the description thereof will be omitted.

In the case of the high frequency heat treatment apparatus B according to the second embodiment of the present invention, two high frequency power supplies were used to simultaneously quench two pin portions, but one high frequency power supply was used instead. Also, the configuration according to the above-described high frequency heat treatment apparatus B may be applied to a conventional high frequency heat treatment apparatus in which a switch for switching is provided between the high frequency power supply and the two heat treatment units. In this case, in the high-frequency heat treatment apparatus B, two pin portions are hardened at the same time, but the difference is that each heat treatment portion 100 placed on the two pin portions performs hardening one by one by switching the switch. .

The induction heat treatment apparatus B according to the second embodiment of the present invention may also be an induction heat treatment apparatus B'having a configuration change that satisfies the relationship of the induction heat treatment apparatus A to the induction heat treatment apparatus A (FIG. 3). That is,
The induction heat treatment apparatus B ′ has one hardening mechanism 10 (however, with respect to the slider 710 of the induction heat treatment apparatus A ′.
Excluding the high frequency power supply. ), A displacement sensor mechanism 600 attached to the quenching mechanism 10, and the other quenching mechanism 1
0 (however, the high-frequency power source is not included), a displacement sensor mechanism 600 attached to the quenching mechanism 10, and a pitch adjusting slide mechanism are attached.

[3] The induction heat treatment apparatus C according to the third embodiment of the present invention is of the coil shift type (see FIGS. 4 and 5). The induction heat treatment apparatus C includes a heat treatment unit 100 corresponding to the induction heat treatment apparatuses A and A ′.
There are two high-frequency heat treatment devices CA and CA 'and two high-frequency heat treatment devices CB and CB' corresponding to the high-frequency heat treatment devices B and B '.

In the induction heat treatment apparatus CA, the shift mechanism is removed from the work holding / rotating mechanism in the induction heat treatment apparatus A, and the quenching mechanism 10 (excluding the high frequency power source) is attached to the quenching mechanism 10. Instead of fixing the displacement sensor mechanism 600 and the displacement sensor mechanism 600 to the apparatus frame 5, as shown in FIG.
It is attached so as to be movable in the front-back direction of the paper surface of FIG.

The heat treatment unit side shift mechanism 800 is provided between a rail body (not shown) protruding from the apparatus frame 5, a slider 810 engaged with the rail body, and between the rail body and the slider 810. Drive mechanism (not shown)
Have and. The quenching mechanism 10 (excluding the high-frequency power source) and the displacement sensor mechanism 600 attached to the quenching mechanism 10 are fixed to the slider 810. The drive mechanism may be the same as the drive mechanism of the shift mechanism of the work holding / rotating mechanism of the high frequency heat treatment apparatus A.

Further, the induction heat treatment apparatus CA has a set control unit which is slightly different from that of the induction heat treatment apparatus A due to the above configuration change. The set control unit of the high frequency heat treatment apparatus CA shifts the swing arm mechanism (or the lifting mechanism) by the shift mechanism in order to shift the crankshaft W, whereas the set control unit of the high frequency heat treatment apparatus A shifts the coil 111. Heat treatment section 100 equipped with
The above is changed by the heat treatment unit side shift mechanism 800.

In the high frequency heat treatment apparatus CA ', the shift mechanism is removed from the work holding / rotating mechanism in the high frequency heat treatment apparatus A', and the heat treatment section side shift mechanism 800 'similar to the heat treatment section side shift mechanism 800 in the high frequency heat treatment apparatus CA is used.
5 is provided between the apparatus frame 5 and the heat treatment section side elevating mechanism 700, as shown in FIG. Further, the induction heat treatment apparatus CA 'has a set control unit which is slightly different from that of the induction heat treatment apparatus A'due to the above configuration change. The set control unit of the high-frequency heat treatment apparatus CA ′ has a coil 111, while the set control unit of the high-frequency heat treatment apparatus A ′ shifts the crankshaft W by the shift mechanism of the work holding / rotating mechanism. The parts 100 and the like are changed to be shifted by the heat treatment part side shift mechanism.

In the high-frequency heat treatment apparatus CB, the shift mechanism is removed from the work holding / rotating mechanism in the high-frequency heat treatment apparatus B, and the heat treatment section side shift mechanism 800 similar to the heat treatment section side shift mechanism 800 in the high-frequency heat treatment apparatus CA is provided. It is provided between the pitch adjusting slide mechanism and the device frame 5 (see FIG. 4).

Further, the induction heat treatment apparatus CB has a set control unit slightly different from the set control unit of the induction heat treatment apparatus B due to the above configuration change. The set control unit of the high-frequency heat treatment apparatus CB shifts the swing arm mechanism (or the elevating mechanism) by the shift mechanism in order to shift the crankshaft W, whereas the set control unit of the high-frequency heat treatment apparatus B shifts the coil 111. Heat treatment section 100 equipped with
The above is changed by the heat treatment unit side shift mechanism 800.

The high-frequency heat treatment apparatus CB ′ has the same shift mechanism 800 as the heat-treatment section side shift mechanism 800 of the high-frequency heat treatment apparatus CB except that the shift mechanism is removed from the work holding / rotating mechanism in the high-frequency heat treatment apparatus B ′. ′
Is provided between the apparatus frame 5 and the heat treatment section side elevating mechanism 700 (see FIG. 5). Further, the induction heat treatment apparatus CB 'has a set control unit slightly different from that of the induction heat treatment apparatus B'due to the above configuration change. The set control unit of the high-frequency heat treatment apparatus CB ′ has a coil 111, while the set control unit of the high-frequency heat treatment apparatus B ′ shifts the crankshaft W by the shift mechanism of the work holding / rotating mechanism. The parts 100 and the like are changed so as to be shifted by the heat treatment part side shift mechanism 800 '.

[4] The induction heat treatment apparatus D according to the fourth embodiment of the present invention has no shift mechanism, and
This is a case where there are two or more quenching stations (see FIGS. 1 and 3; however, only one quenching station is shown). The induction heat treatment apparatus D includes an induction heat treatment apparatus D1 and D1 ′ having four hardening stations and an induction heat treatment apparatus D2 and D2 ′ having two hardening stations.

In the case of the induction heat treatment apparatuses D1 and D1 ', one pin portion is hardened at each hardening station.
The high-frequency heat treatment apparatuses D1 and D1 'correspond to the high-frequency heat treatment apparatuses A and A', respectively, in which the shift mechanism of the work holding / rotating mechanism is removed, and four sets are arranged in tandem. However, the set control unit of the high-frequency heat treatment devices D1 and D1 'does not shift by the shift mechanism and only instructs the setting operation for one pin unit.

In the case of the induction heat treatment apparatuses D2 and D2 ', the pin portions P1 and P4 are hardened at one hardening station and the pin portions P2 and P3 are hardened at the other hardening station. That is, the pin portions in the same phase are heated by one high frequency power source.

The high-frequency heat treatment apparatuses D2 and D2 'have high-frequency heat treatment apparatuses B and B'removing the work holding / rotating mechanism shift mechanism, respectively, and two high-frequency power sources from one to two.
This is equivalent to two sets in which the adjustment range of the slide mechanism for pitch adjustment is adapted to the pin portions P1 and P4 or the pin portions P2 and P3. However, the set control unit of the high-frequency heat treatment devices D2 and D2 'does not shift by the shift mechanism and only instructs the set operation for the pin portions P1 and P4 and the pin portions P2 and P3. The monitoring control units of the high-frequency heat treatment devices D2 and D2 'perform the above-mentioned determinations at the pin portions P1 and P4 and the pin portions P2 and P3, respectively.

[5] The induction heat treatment apparatuses E and E'according to the fifth embodiment of the present invention have no shift mechanism and only one hardening station (see FIGS. 1 and 2). (See FIG. 3).

In the case of the high-frequency heat treatment apparatuses E and E ', the hardening mechanism 10 (however, in the front-back direction of the paper surface of FIGS. 1 and 3) is used in comparison with the high-frequency heat treatment apparatuses B and B'without the shift mechanism. This is equivalent to one in which two sets of a high-frequency power source are excluded) and a displacement sensor mechanism 600 are additionally provided with a pitch adjusting slide mechanism. However, the set control unit of the high-frequency heat treatment apparatus E does not shift by the shift mechanism and instructs only the setting operation for the four pin portions P1 to P4. The monitoring control unit of the high-frequency heat treatment apparatus E has a pin portion P1 having a phase difference of 180 ° with each other,
The above-mentioned determinations regarding P4 and the pin portions P2 and P3 are respectively performed.

[6] Although not shown, the induction heat treatment apparatus according to the sixth embodiment of the present invention is a case where the quenching mechanism of the journal portion is also provided with the displacement sensor portion 610 and the like. Since there is no part that revolves around the journal part,
The necessity of providing the displacement sensor unit 610 and the like is low. However, if the adjustment method is bad, especially after replacing the tension spring, etc., when the heat treatment part is set to the journal part or the journal part is set to the heat treatment part, the space between the tip of the spacer of the high frequency heating coil body and the journal part is It is possible that there will be a gap. The high-frequency heat treatment apparatus is for detecting that the gap has been formed, and has a displacement sensor mechanism 600 and a monitoring control unit.

The monitoring control unit is based on the output of the displacement sensor unit 610 after the setting and at least before the heating process, and whether the distance between the high frequency heating coil body and the journal unit is within the normal range or not. It may be determined whether or not it is out of the range, and when it is determined to be out of the normal range, an alarm is issued, and before or after this, the high-frequency heat treatment apparatus F is usually stopped.

Although the work has been described as a crankshaft, it is obvious that the work is not limited to the crankshaft and may be substantially the same as the above as long as the work has a revolved moving portion such as a pin portion of the crankshaft. Therefore, the description thereof will be omitted.

[0134]

As described above, according to the first aspect of the present invention.
In the high-frequency heat treatment apparatus according to the first aspect of the present invention, a heat treatment unit having a high-frequency heating coil body is suspended and movable, and when the work is rotated, the heat treatment unit placed on the revolved moving unit of the work is affected by the heat treatment unit. The outer peripheral surface of the revolved moving part is heated while circularly moving together with the revolving moving part, and is given to the heat treating part every time it is detected that the heat treating part has reached the reference position in the process of heating. In a high-frequency heat treatment apparatus that switches electric power between a first electric power and a second electric power that is smaller than the first electric power within one cycle of the circular motion, the heat treatment unit placed on the revolved moving unit. Of the displacement sensor unit for detecting the displacement in the up-and-down direction, and based on the output of the displacement sensor unit, it is detected that the heat treatment unit has reached the reference position, and the first electric power is detected based on the detection result. The second And a monitoring control unit that performs control to switch between force, the monitoring control unit, the displacement sensor
The high frequency heating coil body and the revolution
The distance to the moving part is within the normal range or out of the normal range.
If it is judged that it is out of the normal range, a warning is given.
It is supposed to give out information.

Therefore, in the case of the high-frequency heat treatment apparatus according to claim 1 of the present invention, the first heat treatment unit is based on only the output of one sensor which is a displacement sensor unit per heat treatment unit.
It is possible to perform a so-called power reduction operation, which switches between the second power (normal power) and the second power (power in the power reduction state). Further, the output of this displacement sensor unit can be used for other purposes. That is, so-called power reduction operation is made possible by means different from the conventional one, that is, the displacement sensor section and the monitoring control section, and the distance between the high-frequency heating coil body and the revolved moving section is set by the means as described later. It is possible to detect and prevent the generation of defective work in advance, reduce the generation of defective work, or eliminate defective work. Further, the work efficiency can be improved as compared with the case where the limit switch is used conventionally.

[0136]

Moreover, in the case of the above high-frequency heat treatment apparatus, it is determined whether the distance between the high-frequency heating coil body and the revolving moving part is in an appropriate state based on the output of the displacement sensor part. If it is abnormal, it will give an alarm.
It is possible to prevent the generation of defective work pieces in advance and reduce the generation of defective work pieces as compared with the related art, or to eliminate defective work pieces.

[0138] induction heat treatment apparatus according to claim 2 of the present invention, in the induction heat treatment apparatus according to claim 1, either by setting the heat treatment unit with respect to the object revolve portion is positioned at the bottom dead center, or , With respect to the heat treatment section, the revolved moving section is set so as to be positioned at bottom dead center,
And when the setting by any one is completed, it has a set control unit that sends a completion signal to the monitoring control unit, and the monitoring control unit, upon receiving the completion signal, performs the determination at least before the heating process. To do.

Therefore, in the case of the high-frequency heat treatment apparatus according to claim 2 of the present invention, in the setting stage before the heating process, the revolved moving part is set so as to come to the bottom dead center, At this point, if the distance between the high-frequency heating coil body and the revolved moving part is already inappropriate, an alarm is issued. Therefore, in the case of the improper state, it is possible not to shift to the heating process, and it is possible to prevent the generation of defective work. Therefore, the generation of defective work can be reduced as compared with the conventional case.

The induction heat treatment apparatus according to claim 3 of the present invention is the induction heat treatment apparatus according to claim 2 , wherein the monitoring control unit makes the determination also in the heating process.

Therefore, in the case of the high-frequency heat treatment apparatus according to claim 3 of the present invention, when the alarm is issued during the heating process,
Since the occurrence of defective work can be known, defective work can be eliminated.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an induction heat treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic front view showing a crankshaft for four cylinders as an example of a crankshaft as a work.

FIG. 3 is a schematic explanatory view showing another example of the induction heat treatment apparatus according to the embodiment of the present invention.

FIG. 4 is a schematic explanatory view showing still another example of the high-frequency heat treatment apparatus according to the embodiment of the present invention.

FIG. 5 is a schematic explanatory view showing still another example of the high-frequency heat treatment apparatus according to the embodiment of the present invention.

[Explanation of symbols]

P1 to P4 Pins (revolved moving parts) W crankshaft (work) 100 heat treatment department 110 High frequency heating coil body 610 Displacement sensor section

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) C21D 9/00-9/44, 9/50 C21D 1/02-1/84 H05B 6/06

Claims (3)

(57) [Claims] 1. A heat treatment section having a high-frequency heating coil body is suspended and movable, and when the work is rotated, the heat treatment section placed on the revolution-removed section of the work is revolved. Heating the outer peripheral surface of the revolved moving part while making circular motion with the part, and, in the process of heating, each time it is detected that the heat treatment part has reached the reference position,
In the high-frequency heat treatment apparatus that switches the electric power applied to the heat treatment section to the first electric power and the second electric power that is smaller than the first electric power within one cycle of the circular motion, the high frequency heat treatment apparatus is installed on the revolved moving section. A displacement sensor section for detecting the vertical displacement of the heat treatment section, and based on the output of this displacement sensor section, it is detected that the heat treatment section has reached the reference position, and based on this detection result, the The monitoring control unit includes a monitoring control unit that controls to switch between the first power and the second power .
Based on the output, the high frequency heating coil body and the revolved moving part
Whether the distance between is within or outside the normal range
Makes a judgment and issues an alarm if it is judged to be outside the normal range
Induction heat treatment apparatus, characterized in that that. 2. The induction heat treatment apparatus according to claim 1.
The above-mentioned revolving moving part located at the bottom dead center,
Set the heat treatment part or connect it to the heat treatment part.
And set the revolved moving part so that it is positioned at the bottom dead center.
And when the setting by either is completed,
With a set control unit that sends a completion signal to the visual control unit
When the monitor control unit receives the completion signal,
An induction heat treatment apparatus, characterized in that the determination is performed before the heating process . 3. The induction heat treatment apparatus according to claim 2
In the heating process,
An induction heat treatment apparatus characterized by making a determination .