JPH0637030B2 - Grinding cutting device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grinding and cutting apparatus that rotates a rotating grindstone and moves it toward a work, and cuts and cuts the work by the rotating grindstone. The present invention relates to a device equipped with a device for measuring the diameter of.

(Prior Art) Conventionally, as a device for detecting the wear amount of a rotary grindstone, for example, there is one shown in Japanese Patent Publication No. 54-5547, which blows air to the peripheral portion of the rotary grindstone and This is a configuration in which the amount of wear of the rotary grindstone is detected by the change in resistance.

Further, as shown in JP-A-54-1491, the wear amount of a rotary grindstone is obtained from the displacement amount of the contact by a displacement meter equipped with a wear-resistant contact, and JP-A-61-61.
As disclosed in No. 226262, there is a device that uses a piezo element to measure the distance between a rotary grindstone and an object to be ground.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional example, although the wear amount of the rotary grindstone can be detected, it is not possible to detect the diameter of the rotary grindstone, and therefore the diameter of the rotary grindstone is detected. Means must be provided separately.

In addition, those that use air or use a piezo element,
The configuration becomes complicated, a process for detection is required, the time for one work process becomes long, and the work efficiency is reduced.

What detects the amount of wear of the rotating grindstone from the amount of displacement of the contact, when using a large-diameter rotating grindstone, in response to this, it is necessary to increase the maximum amount of displacement of the contact,
This is not preferable because the detector becomes large.

Therefore, it is an object of the present invention to provide a grinding and cutting device equipped with a device for measuring the diameter of a rotary grindstone that solves the above-mentioned conventional drawbacks.

(Means for Solving the Problem) In order to solve this problem, the present invention is a grinding and cutting device that moves a rotating grindstone toward a work while rotating the grindstone and grinds and cuts the work by the rotary grindstone. A contact detector that has a contactor disposed at a predetermined position within a stroke range in which the rotary grindstone moves to cut the work, and a contact detector that detects that the rotary grindstone contacts the contactor; A control device that moves the contactor to a position that does not contact the rotating grindstone immediately after the rotating grindstone contacts the child, and a moving amount that the rotating grindstone moves from a predetermined origin position to contacting the contactor. Based on the above, an arithmetic unit for calculating the diameter of the rotary grindstone is provided.

(Operation) With the above configuration, the present invention can detect the diameter of the rotary grindstone by using a detector having a simple structure, can be configured in a small size, and further has a contactor that directly contacts the peripheral edge of the rotary grindstone. Since it is used, the detection accuracy is high.

Further, the present invention, by arranging the contact at a predetermined position in the moving range of the rotary grindstone, during the detection cutting work process, the diameter of the rotary grindstone can be detected. It is not necessary to add a stroke to, and the work time does not increase, and the work efficiency is improved.

(Embodiment) FIG. 1 is a front view of a rotary grindstone grinding and cutting machine having an embodiment of the present invention.

A carry 3 having rollers 5 and 6 and movable horizontally on the machine base 1 is placed on the machine base 1.

A piston rod 8 of a cylinder (not shown) fixed on the machine base 1 is fixed to the lower surface of a rear frame 7 extending to the rear of the carry 3, and the piston rod is sucked into the cylinder. , Carry 3 moves leftward in the figure.

A turntable 1 is supported on the carry 3 so as to be vertically turnable about a turning shaft 9 fixed on the carry 3.
0 is provided.

The motor 4 is fixed to the upper surface of the rear part of the rotary table 10, and the bearing 11 is fixed to the upper surface of the front part of the rotary table 10.

A shaft 12 connected to the motor 4 is provided in the bearing 11.
The rotation of the shaft 12 is transmitted to the rotation shaft 13 rotatably supported by the tip of the bearing 11 by converting the rotation direction by 90 ° through a bevel gear (not shown).

A rotary grindstone 14 is attached to the rotary shaft 13.

A holder 15 for swingably holding a cylinder 16 is provided at a front portion of the carry 3, and a tip end of a piston rod 17 of the cylinder 16 has a tip of a mounting shaft ( It is rotatably attached to a shaft (not shown).

By sucking the piston rod 17 into the cylinder 16 from the state shown in the figure, the front part of the turntable 10 turns downward, and the rotary shaft 13 of the rotary grindstone 14 also turns downward accordingly.

A work insertion port 18 is formed in the machine frame 2 in front of the machine base 1, and a workpiece 22 to be ground such as a steel pipe is inserted into the work insertion port 18.

A fixed clamp 19 is provided at one end of the work insertion port 18, and a movable clamp 20 attached to a cylinder 21 is disposed at the other end.

After inserting the object 22 to be ground into the work insertion port 18,
By moving the movable clamp 20 to the right in the figure, the object to be ground 22 is moved to the fixed clamp 19 and the movable clamp 20.
It is pinched by.

After that, the carrier 3 is moved in the direction of arrow A as shown by the imaginary line in the figure, and the rotary base 10 is rotated downward, so that the rotating grindstone 14 rotating at high speed is moved to the arrow B in the figure. The workpiece 22 is rotated in the direction to grind and cut the object 22 to be ground.

A contact detector 30 including a contactor 31 with which the peripheral edge of the rotary grindstone 14 comes into contact when the rotary grindstone 14 descends is provided near the work insertion opening 18.

The contact detector 30 has the configuration shown in FIGS. 2 and 3.

A bracket 34 is horizontally projected from a front plate 33a of the housing 33 fixed to the machine frame 2, and a bearing plate 35 is fixed to the tip of the bracket 34.

A fixed plate 36 is attached to the bearing plate 35, and a limit switch 41 is attached to the fixed plate 36.

A bearing 38 is inserted and fixed to the front plate 33a of the housing 33, and the hollow shaft 42 is slidably supported in the axial direction by the bearing 38 and the bearing plate 35. The shaft 37 is inserted into the hollow shaft 42, and the bushes 40 and 45 are interposed therebetween,
The shaft 37 is rotatable within the hollow shaft 42.

A boss 43 having an arm portion 43a is attached to the tip of the shaft 37, and is fixed to the shaft 37 by tightening with an end plate 44.

One end of an arm-shaped contactor 31 that extends horizontally below the work insertion port 18 is fixed to the arm portion 43a.

A hard ceramic plate 32 is fixed to the upper surface of the contactor 31 as a wear-resistant material so that the contactor 31 does not wear when it comes into contact with the rotary grindstone 14.

As a material for the ceramic plate 32, for example, a ceramic having alumina of about 98% such as carbonized alumina or alumina nitride is used. It has high wear resistance, heat resistance and impact resistance.

In this contactor 31, the rotary grindstone 14 is the object to be cut 2 to be ground.
When the cutting wheel 2 is cut and cut, the rotary grindstone 14 is arranged in the moving direction, and the lower peripheral edge of the rotary grindstone 14 is brought into contact with the contact 31 during the process of the rotary grindstone 14 cutting and cutting the workpiece 22 to be ground. It is placed in contact.

A limit switch 41 is attached to the fixed plate 36, and an arm 45 arranged so as to be able to contact the limit switch 41 is fixed to the rear end of the shaft 37.

The arm 45 is urged downward by a spring 39, and when the contact 31 is not loaded, the force of the spring 39 causes the arm 45 to move to the limit switch 4
It is in contact with 1.

A cam 46 is fixed to the rear end surface of the bearing 38, and the cam 46 has a mountain in the axial direction of the shaft 37.

A dog 48 is fixed to the hollow shaft 42 so as to face the cam 46, and a roller 47 that abuts the cam 46 is attached to a part of the outer periphery of the dog 48.

A piston rod 49 of a cylinder 50 whose lower end is rotatably attached to the machine frame 2 is locked to the dog 48.

By extending the piston rod 49, the dog 4
8 rotates (the hollow shaft 42 also rotates integrally), and the roller 47 moves up to the mountain of the cam 46. As a result, the dog 48 is pushed in the direction of arrow C in FIG.

When the dog 48 is pushed in the direction of arrow C, the dog 48
The hollow shaft 42 to which is fixed also moves in the same direction,
Along with this, the shaft 37 and the contactor 31 also move in the same direction.

In this way, the reason for moving the contact 31 is that the contact 3
This is to remove the contact 31 from the moving surface of the rotary grindstone 14 after the rotary grindstone 14 contacts 1 to reduce the wear of the contact 31 and to prevent the movement of the rotary grindstone 14 from being disturbed.

The dog 48 is biased rightward in FIG. 3 by the spring 51, and when the piston rod 49 is attracted to the cylinder 50 and the roller 47 descends to the valley of the cam 46,
The urging force of the spring 51 pushes the dog 48,
The contactor 31 is returned to the original position.

A proximity switch 52 is attached to the bracket 34 via an arm 53.
The sensing plate 540 is disposed so as to move integrally with the dock 48 so as to face the sensing unit of.

As described above, when the piston rod 49 extends and the contactor 31 moves for a predetermined distance, the sensing plate 54 is disengaged from the sensing part of the proximity switch 52, and the movement of the contactor 31 can be detected.

Next, FIG. 4 is a cross-sectional view of the trailing frame 7 at the rear of the carry 3 and the rear of the turntable 10.

At the rear end of the rear frame 7, there is provided a pulley 57 pivotally mounted on the bearing base 63.

A pulley 59 is attached to the lower surface of a plate 62 extending rearward from the upper surface of the carry 3 via a bearing stand 64, and the rotary encoder 5 is attached to the upper surface of the plate 62.
5 is fixed.

A pulley 60 is axially mounted on the wall surface of a housing 65 that houses the rotary encoder 55.

A holder 61 is fixed to the rear part of the turntable 10,
A pulley 56 is axially attached to the holder 61.

The rubber belt 5 having one end fixed to the pulley 57
8 is a pulley 59, a shaft 55 of the rotary encoder 55
a, it is hung on the pulley 60, and the other end is fixed to the pulley 56.

The rubber belt 58 is stretched by the movement of the pulley 56 when the rotary base 10 rotates, and at this time, rotates the shaft 55a of the rotary encoder 55. Therefore, the rotation amount (rotation angle) of the rotary base 10 can be detected from the rotation amount of the shaft 55a of the rotary encoder 55.

FIG. 5 is a block diagram showing the configuration of the control device equipped in this embodiment.

The arithmetic unit 66 is configured by using an arithmetic circuit such as a microcomputer, and has a switch signal S1 of the limit switch 41 and a switch signal S of the proximity switch 52.
2, the output signal S3 of the rotary encoder 55, and other control input signals are input.

Further, from the arithmetic unit 66, a motor driver 65 for controlling the rotation speed of the motor 4 for driving the rotary grindstone 14.
Then, the speed command signal S4 is output. In addition, the arithmetic unit 66 outputs a control signal for the cylinder and the like.

The arithmetic device 66 calculates the diameter of the rotary grindstone 14 based on the switch signal S1 of the limit switch 41 and the output signal S3 of the rotary encoder 55, and based on the calculated diameter, the diameter of the rotary grindstone 14 is calculated. The rotational speed of the rotary grindstone 14 is controlled so that the peripheral speed of the rotary grindstone 14 is always constant regardless of the change of.

The calculation of the diameter of the rotary grindstone 14 is performed by the operation described below.

At the time of grinding and cutting the object to be ground 22, the carrier 3 is mounted on the machine base 1.
The center of the rotary grindstone 14 is moved to the descent start point O (shown in FIG. 1) of the rotary grindstone 14 by moving up.

The descending start point O is a position when the axis of the shaft 12 is horizontal, and the descending start point O is the origin. The horizontal position of the descending start point O differs depending on the movement distance of the carry 3 (it differs depending on the number of the objects 22 to be ground and the grinding and cutting method such as push cut and pull cut).

Next, when the piston rod 17 is sucked by the cylinder 16 and the rotary base 10 rotates about the rotary shaft 9, the rotary grindstone 14 also rotates about the rotary shaft 9 as a fulcrum. As described above, the rubber belt 58 is stretched and the shaft 55a of the rotary encoder 55 rotates.

Since the rotation amount of the shaft 55a of the rotary encoder 55 is proportional to the rotation angle of the rotary grindstone 14, the calculation device 66
The number of pulses of the output signal S3 of the rotary encoder 55 is counted, and this count value is stored as the rotation angle of the rotary grindstone 14 (of course, the rotation angle data can be directly obtained by using an absolute encoder). .

When the rotary grindstone 14 is rotated and the grinding and cutting work of the object to be ground 22 progresses, the rotary grindstone 14 is in the middle of this work process.
The peripheral edge of the contactor 31 contacts the contactor 31, and the contactor 31 is pushed by the rotary grindstone 14 and rotates in the direction of arrow D in FIG.

As a result, the shaft 37 to which the contactor 31 is attached rotates, and the arm 45 fixed to the shaft 37 is rotated.
Is rotated, the arm 45 is separated from the limit switch 41, and the limit switch 41 is turned off.

The arithmetic unit 66 detects that the limit switch 41 is turned off by the switch signal S1 of the limit switch 41, and temporarily stores the turning angle θ of the rotary grindstone 14 at this time.

The stored rotation angle θ is used to calculate the diameter L of the rotary grindstone 14.

That is, as shown in FIG. 1, since the distance N between the descending start point O of the rotary grindstone 14 and the contact 31 is a predetermined value, the descending distance K of the rotary grindstone 14 is calculated from the rotation angle θ. By calculating and subtracting from the predetermined distance N, the diameter L of the rotary grindstone 14 can be obtained.

The diameter L of the rotary grindstone 14 thus obtained is calculated by the arithmetic unit 6
6 is temporarily stored in 6 and is used for calculation for determining the rotation speed V of the rotary grindstone 14 this time.

The rotation speed V is determined based on the diameter L of the rotary grindstone 14 by constantly obtaining a rotation speed such that the peripheral speed of the rotary grindstone 14 is constant.

The determined rotation speed V is output to the motor driver 67 as a speed command signal S4, and the motor driver 67 controls the rotation speed of the motor 4 according to the speed command signal S4.

On the other hand, when the limit switch 41 is turned off, the arithmetic device 66 drives a cylinder driving device (hydraulic pump or the like) (not shown) to drive the cylinder 50.
Thereby, as described above, the dog 48 is rotated to move the contactor 31 in the direction of the arrow C in FIG. 3, and the contactor 31 is removed from the track of the rotary grindstone 14.

Whether the contactor 31 has deviated from the orbit of the rotary grindstone 14 is determined by the arithmetic unit 66 when the switch signal S2 of the proximity switch 52 is turned off.

As described above, in the present embodiment, the contact detector 30 detects that the rotary grindstone 14 has contacted the contact 31 with the peripheral edge of the rotary grindstone 14, and the rotation angle θ of the rotary grindstone 14 at this time is detected by the rotary encoder. By detecting with 55, the rotary whetstone 1
The diameter L of 4 can be detected. Moreover, the rotary whetstone 1
By directly bringing the contactor 31 into contact with the rotary wheel 4,
The detection accuracy is much higher than that of the method of indirectly detecting the outer peripheral edge of No. 4.

In addition, although the said Example showed the example which applied this invention to the grinding cutting machine which rotates the rotary grindstone 14 and grind-cuts the to-be-ground object 22, the present invention is not limited to this. Needless to say, the present invention can be applied to an apparatus that moves a rotating grindstone in parallel to perform grinding cutting.

In the above embodiment, the diameter of the rotary grindstone 14 is detected,
Although an apparatus for controlling the peripheral speed of the rotary grindstone 14 is shown as an example, in addition to this, the distance between the rotary grindstone 14 and the object to be ground is determined from the diameter of the rotary grindstone 14 to stabilize the processing accuracy. It can also be applied to notifying the replacement time of the rotary grindstone 14 from the wear value of the rotary grindstone 14.

(Effects of the Invention) As described in detail above, the present invention can detect the diameter of a rotary grindstone using a detector having a simple structure, can be configured in a small size, and can directly Since the contactor that contacts the peripheral edge is used, the detection accuracy is high.

Further, the present invention, by arranging the contact at a predetermined position of the moving range of the rotary grindstone, during the cutting and cutting work process, the diameter of the rotary grindstone can be detected, and therefore, it is necessary to separately measure the diameter. It is not necessary to add a stroke to, and the work time does not increase, and the work efficiency is improved.

Further, immediately after the rotary grindstone comes into contact with the contactor, the contactor moves to a position where it does not come into contact with the rotary grindstone, so that the contactor can be prevented from being damaged by the rotary grindstone.

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of a grinding and cutting machine to which an embodiment of the present invention is applied, FIG. 2 is a front view showing the configuration of a contact detector that constitutes the same embodiment, and FIG. Sectional view of the vessel,
FIG. 4 is a rear sectional view of the carrier and the turntable in FIG.
FIG. 5 is a block diagram of the electric control device in this embodiment. 3 ... Carry 9 ... Rotating shaft 10 ... Rotating base 30 ... Contact detector 31 ... Contact 41 ... Limit switch 55 ... Rotary encoder 58 ... Rubber belt 66 ... Computing device 67 ... Motor driver θ …… Rotation angle L …… Diameter

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Susumu Amo ▲ Hiro ▼ 5-15 Kitahama, Higashi-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd. (72) Kuniharu Suto 5-15 Kitahama, Higashi-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd.

Claims (1)

[Claims] 1. A grinding and cutting apparatus for rotating a rotating grindstone and moving it toward a work, and grinding and cutting the work by the rotating grindstone, wherein the rotating grindstone moves within a predetermined stroke range for cutting the work. A contact detector having a contactor disposed at the position, and detecting the contact of the rotary grindstone to the contactor, and rotating the contactor immediately after the rotary grindstone contacts the contactor. A controller for moving the wheel to a position not contacting the grindstone, and an arithmetic unit for calculating the diameter of the rotary grindstone on the basis of the amount of movement of the rotary grindstone from a predetermined origin position until it comes into contact with the contactor. A grinding and cutting device characterized by being provided.