JPS6254844B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device for heat treatment that heats objects to be heated such as shaft parts for heat treatment such as quenching. The present invention relates to a heating device for heat treatment.

Some shafts used as mechanical parts are partially hardened only in the parts supported by bearings or the parts to which gears and the like are attached. Heating devices used for partial hardening of such shafts generally move the object to be heated in the axial direction while rotating it or without rotating it, and apply the heated object to the heated area by a heating member such as a high-frequency induction heating work coil. It allows heated objects to pass through. The heating member is started when the hardened portion of the object to be heated approaches the heating member, and the operation of the heating member is stopped after the hardened portion passes through the heating region.

Conventionally, as means for starting and stopping the heating member, the operation switch of the heating member is manually operated. However, this manual operation has the disadvantage that the device is complicated to operate and work efficiency is reduced. In addition, as an automatic operation means, the above operation switch is operated by a mechanical means using a cam.
The cam is turned on and off, and the dimensions of the heated part of the object to be heated are set by the shape of this cam. However, controlling the starting and stopping of the heating member using such mechanical means requires a complicated mechanical structure, which makes manufacturing and maintenance of the device complicated. In addition, when processing a variety of heated objects, it is necessary to change the dimensions of the heated part of each heated object, but this requires replacing the cam and adjusting the limit switch dog. It takes time,
This causes work efficiency to decrease. In addition, the above-mentioned cams must be manufactured in a variety of types to correspond to the number of types of objects to be heated, which adds to the number of preliminary work steps and increases costs.

The present invention eliminates the drawbacks of conventional heating devices using mechanical control, and by using electrical control, the mechanical structure of the device is simplified, and it is possible to heat a variety of objects to be heated. The purpose is to speed up and facilitate the setup work for processing.

The present invention detects the moving distance of the intersection position of the object to be heated and the heating member by the number of pulses oscillated to a pulse motor or the number of pulses detected by a detector such as an encoder and a generator, and this number of pulses is detected by a pulse counter circuit. It is characterized in that the heating member is counted and the heating member is controlled to start and stop at the timing when the counted number reaches a certain number.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view schematically showing the heating apparatus for heat treatment according to the first embodiment of the present invention, FIG. 2 is a perspective view showing the positional relationship between the object to be heated and the heating member, and FIG. FIG. 4 is a timing chart for electrical control.

In the embodiment shown in FIG. 1, reference numeral 1 in the figure represents a support member. This support member 1 consists of two rollers 2a and 2b arranged close to each other in parallel.
A heated object W such as a shaft component is placed and supported between the book rollers 2a and 2b. Pulleys 3a and 3b are provided at the rear ends of these two rollers 2a and 2b, respectively, and a geared motor 4 for rotating the pulleys 3a and 3b.
A transmission belt 6 is wound between the drive pulley 5 and the heated object W is rotated in the direction of the arrow by the rotation of the rollers 2a and 2b.

Further, a moving device 7 is disposed at the rear of the support member 1. The moving device 7 includes a push rod 8 for pushing out the object W to be heated from the rear end, and a rack 9 connected to the rear end of the push rod 8. A pulse motor 10 is provided as a means for feeding the rack 9, and a pinion 11 equipped on the pulse motor 10 meshes with the rack 9.

On the other hand, a high-frequency induction heating work coil 12 is disposed as a heating member in front of the rollers 2a and 2b, and the heated object W that moves on the rollers 2a and 2b by the action of the moving device 7 is heated by this work coil. It passes through the center of the high frequency induction heating work coil 12. The high frequency induction heating work coil 12 is connected to a high frequency oscillator 13, and the high frequency oscillator 13 and the pulse motor 10 are connected to and controlled by a controller 14.

Next, the pulse motor 10 and the high frequency oscillator 1
A circuit configuration for electrically controlling 3 and 3 will be explained with reference to FIG. A pulse oscillation circuit 14a is provided in the controller 14, and control pulses from the pulse oscillation circuit 14a are sent to a pulse motor drive circuit 10a to drive the pulse motor 10. Similarly, a microcomputer is built in the controller 14, and based on the stored program set in the memory 14b, a CPU 14c (central processing unit; here, a microprocessor including a system controller and a clock generator) is operated. ) from the pulse oscillation circuit 14a to the pulse motor drive circuit 10.
The number of pulses emitted to a is counted, and arithmetic control is performed so that a signal is emitted when this number of pulses reaches a constant value. Also this CPU14
A flip-flop 14 is used as a circuit for starting and stopping the high frequency oscillation circuit 13a according to the signal from c.
d is provided.

Further, as an operation input section of the microcomputer, a key 15 and a magnetic cassette tape insertion slot 17 are provided on the panel of the controller 14, and this panel is also provided with a digital display 16.

Next, the operation of the heating apparatus for heat treatment according to the present invention will be explained below.

First, input control data regarding the heated part of the object W to be heated using the key 15,
Alternatively, the data can be input using a magnetic cassette tape. This control data indicates that the heated part of the object W to be heated is from the starting position to the high frequency induction heating work coil 1.
This is based on the number of pulses required to reach the center of the high-frequency induction heating work coil 12 and the number of pulses required until the heated portion passes through the center of the high-frequency induction heating work coil 12.

For example, as shown in FIG. 2, the position l ₁ from the tip of the heated object W having a total length l is the first heating part α ₁ , and the position l ₂ behind this first heating part α ₁ is the position l 1. 2 heating portion α ₂ , the number of pulses (for example, 100 pulses) corresponding to the distance of the run-up distance x for the tip of the object to be heated to the high-frequency induction heating work coil 12 and the distance l ₁ above, and The first heating part α ₁ is a high frequency induction heating work coil 12
The number of pulses (for example, 60 pulses) corresponding to the distance passing through the center of the pulse is input as control data. In addition, the number of pulses corresponding to the movement of the distance l ₂ to the second heating portion α ₂ (for example, 30 pulses) corresponds to the distance that the second heating portion α ₂ passes through the center of the high-frequency induction heating work coil 12. Input the number of pulses (for example, 40 pulses) at the same time.

Next, the heated object W is placed on the rollers 2a and 2 of the support device 1.
When the start switch of the controller 14 is turned on, the rollers 2a and 2b rotate,
The round rod-shaped object W to be heated starts to rotate, and a control pulse (FIG. 4B) is sent from the pulse oscillation circuit 14a to the drive circuit 10a of the pulse motor 10, so that the pulse motor 10 is driven and the pinion 11 and the rack are connected. 9 causes the pushing rod 8 to push the rear end of the object to be heated W, thereby causing the object to be heated W to move toward the rollers 2a, 2.
Start moving on b. This control pulse is CPU1
4c, and the count number is input as control data, for example 100.
When it becomes a pulse, a signal (C in Figure 4) is sent from the CPU 14c to the flip-flop 14d.
The output of flip-flop 14d becomes high level. (Figure 4D). When the level reaches this high level, an ON signal is sent to the high frequency oscillation circuit 13a, the high frequency oscillation circuit 13a is started (Fig. 4E), and heating of the heated portion _α1 of the heated object W is started (the Figure 4A). Furthermore, after heating starts, a certain number of control pulses are applied,
For example, when the number of pulses reaches 60, the CPU14c
A signal is output from the flip-flop 14d to the flip-flop 14d (FIG. 4C), the flip-flop 14d becomes low level (FIG. 4D), and the high-frequency oscillation circuit 13a
The OFF signal is sent and the high frequency oscillation circuit 13a is stopped (Fig. 4E). Then, in the same way as the above operation, a certain number of times after the heating of the first heating section α ₁ is completed, e.g.
After 30 pulses, the high frequency oscillation circuit 13a is turned ON again for 40 pulses, and the second heating portion _α2 is heated. In this way, only the portions α ₁ and α ₂ of the object to be heated W that require quenching are partially heated. Immediately after this heating is completed, the object W to be heated is continuously cooled with water, and then the object to be heated W is cooled by the pulse motor 10.
is sent over the rollers 2a, 2b and the rollers 2a, 2
It falls from the front end of b and the quenching is completed.

The above operation is automatically repeated, and the heated object W is sequentially fed onto the rollers 2a and 2b from a heated object supplying means (not shown), and this heated object W is automatically heated at the same location by the above-mentioned process. heated to. Furthermore, when the type of object W to be heated changes and the position of the heating part for quenching changes, simply by inputting the new number of pulses as control data using the key 15 or the magnetic cassette tape, it is possible to immediately change the type of object W to be heated. The object W can be subjected to heat treatment.

Furthermore, the control pulses sent to the pulse motor 10 may always have a constant frequency, and the object to be heated W may be moved at a constant speed from beginning to end. In the example shown in the figure, the frequency of the control pulse is increased only during the first 100 pulses to rapidly advance the heated object W, and after the first heating portion _α1 approaches the high-frequency induction heating work coil 12, the frequency is lowered and the heating begins. It is also possible to reduce the speed to an appropriate speed. Further, the heating member is not limited to the high-frequency induction heating work coil, but a laser hardening device or heating means using flame may be used. In the case of laser or flame, the laser generator or flame generator may be started or stopped by the ON/OFF signal of the flip-flop 14d. Alternatively, the object to be heated W may be stopped, and the heating members such as the high-frequency induction heating work coil 12 may be moved by a pulse motor.

In addition, as another example of a start/stop circuit that starts and stops the heating member 12, a magnetic holding relay is turned on by a signal from the CPU 14c to start the high frequency oscillation circuit 13a, etc., and a timer linked to this relay is used. for a certain period of time (heated parts α ₁ , α ₂
Turn off the relay after the time corresponding to the dimensions of
It is also possible to do so.

Further, as an example of a case where a microcomputer is not used for control of the present invention, the pulse oscillation circuit 14a
The number of pulse oscillations may be counted using a normal pulse counter. In this case, the heating portion and heating range are set by manually setting the number of pulses counted by the pulse counter.

Further, as shown in FIG. 5, an extrusion rod 8 for extruding the object W to be heated is guided by a guide bush 18, and a female screw holder 19 is fixed to the rear end of this extrusion rod 8. The moving device 7' may be configured such that the screwing screw 20 is rotationally driven by the pulse motor 10.

Next, FIG. 6 shows a circuit diagram of a heating apparatus for heat treatment according to a second embodiment of the present invention. In this embodiment, a motor 21 (AC or DC motor) equipped with an encoder 21a and a generator 21b as a detector is used to operate the moving device 7.

In its operation, first, the motor 21 is driven by a command issued from the CPU 14c to the motor drive circuit 22, and the object W to be heated is moved. The rotation speed of this motor 21 is determined as a constant pulse by an encoder 21a and a pulse generator 21b.
Feedback is provided to the CPU 14c. This feedback pulse is counted within the CPU 14c. Then, control data input in advance into the microcomputer using the key 15 or the magnetic cassette tape, that is, the number of pulses (corresponding to the length from which the first heating section _α1 reaches the high frequency induction heating work coil 12) For example, 100 pulses) is compared with the counted pulse number, and when the counted pulse number reaches 100 pulses, a signal is sent to the flip-flop 14d. This signal starts the high frequency oscillation circuit 13a and heats the object W, as in the first embodiment. Thereafter, when a certain number of pulses are counted, a signal is sent to the flip-flop 14d, and the heating of the first heating portion _α1 and the second heating portion _α2 of the object to be heated W is completed.

Further, in this second embodiment, a pulse counter for counting the number of pulses fed back from the encoder 21a and a comparator for comparing the counted pulse number with a preset number of pulses are provided without using a microcomputer. You can also do that.

Further, the encoder 21a and the generator 21b as a detector may be operated in conjunction with the pinion 11 (FIG. 1) provided in the motor 21, or may be operated in conjunction with other gear transmission means taken out from the drive system of the motor 21. It can also be activated by tilting it. Furthermore, the workpiece extrusion rod 8 and rack 9 (first
A linear scale encoder is attached as a detector to a linearly movable part such as the female screw holder 19 (Fig. It is also possible to do this. This linear scale encoder has a magnetic scale attached to the linear movable part, detects the linear movement of the magnetic scale with a magnetic head, extracts this as a pulse number, and reads out the pulse number.

As described above, according to the present invention, the starting and stopping of the heating member is controlled by electrical means, which simplifies the mechanical structure and facilitates manufacturing and maintenance. In addition, by synchronizing the starting and stopping of the heating member with a means for moving the heated object using a pulse motor or a detector that detects movement by the number of pulses, the accuracy of the heating range of the heated object is improved, and the quenching Work becomes more uniform and quality improves. moreover,
The hardening range for any mode can be set simply by inputting the number of pulses as control data into the microcomputer, so there is no need to replace cams or limit switch dogs as with conventional mechanical systems, and only key operations are required. , it is possible to reduce the number of setup steps by performing only the preliminary work of setting the cassette tape. In addition, there is no need to manufacture cams or jigs, and there are excellent effects such as a reduction in work costs.

That is, according to the present invention, in a round rod-shaped object to be heated such as a shaft of a machine, at an arbitrary position,
In addition, partial hardening at multiple locations can be performed freely and efficiently in succession. In addition, even if the position, length, and number of hardened parts of the object to be heated differ, the heating part can be set arbitrarily just by inputting data, allowing partial heat treatment for parts produced in a wide variety of small quantities. can be realized at low cost. Furthermore, since the round rod-shaped object to be heated is supported by rotation, uneven heating temperature due to variations in the distance between the object to be heated and the heating member is reduced, and unevenness of heating temperature is reduced, thereby preventing the occurrence of bending of the object to be heated. can. Therefore, the accuracy of the parts after heat treatment can be maintained, almost no centering work is required, and even if bending occurs, centering work can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing the heating apparatus for heat treatment according to the first embodiment of the present invention, FIG. 2 is a perspective view showing the positional relationship between the object to be heated and the heating member, and FIG. 3 is a perspective view showing the electrical control. Figure 4 is a timing chart for electrical control, where A is the heating range of the object to be heated, B is the signal output of the pulse oscillation circuit, C is the output from the CPU, and D is the flip-flop. Output E indicates the output of the high frequency oscillation circuit, FIG. 5 is a perspective view showing another means of the moving device, and FIG. 6 is a circuit configuration diagram showing a second embodiment of the present invention. W...Object to be heated, 1...Support device, 7, 7'...
...Moving mechanism, 10...Pulse motor, 12...Heating member, 14a...Pulse oscillation circuit, 14b...
Memory, 14c...Pulse number counting circuit, 1
4d...Flip-flop (start/stop circuit),
21a, 21b...detector (encoder, generator).

Claims (1)

[Scope of Claims] 1. A mechanism that includes a support member that supports a round bar-shaped object to be heated while rotating it, and that moves the intersection position of the object to be heated on the support member and a heating member that heats the object to be heated. A pulse motor is provided as a drive source of the pulse motor, and a pulse oscillation circuit is provided to provide pulses to the pulse motor, and the number of pulses oscillated from this pulse oscillation circuit is counted.
The number of pulses input in advance to indicate the distance from the heating member to the heating position on the object to be heated and the range of the heating part is compared with the pulse count number, and the number of pulse counts indicates the start and end points of the heating part. A heating device for heat treatment, comprising a control circuit that emits a signal when the number of pulses matches a commanded number, and a start/stop circuit that starts or stops the heating member based on the signal from the control circuit. 2. A support member that supports a round bar-shaped object to be heated while rotating it, and a drive source for a mechanism that moves the intersection position of the object to be heated on the support member and a heating member that heats the object to be heated, In addition, this moving mechanism is provided with a detector that detects the moving distance of the intersection position of the object to be heated and the heating member by the number of pulses, and furthermore, the number of pulse oscillations from this detector is counted, and the heating member The number of pulses input in advance to indicate the distance from to the heating position on the object to be heated and the range of the heated part is compared with the pulse count number, and the pulse count number indicates the start and end points of the heated part. It is equipped with a control circuit that emits a signal when the number of pulses matches, and
A heating device for heat treatment comprising a start/stop circuit that starts or stops the heating member based on a signal from the control circuit. 3. Heating for heat treatment according to claim 2, wherein the detector is an encoder and a generator attached to a motor that is a drive source of a mechanism that moves the intersection position of the object to be heated and the heating member. Device. 4. The heating device for heat treatment according to claim 2, wherein the detector is an encoder and a generator attached to a power transmission section of a mechanism that moves the object to be heated and the heating member at an intersection position. 5. The heating device for heat treatment according to claim 2, wherein the detector is a linear scale encoder attached to a mechanism that moves the intersection position of the object to be heated and the heating member. 6. The heating device for heat treatment according to claim 1 or 2, wherein the control circuit is a CPU of a microcomputer.