JPH02198766A - Control device for grinding amount of grinding device - Google Patents

Abstract

PURPOSE:To simplify the final thickness change of the body to be ground at a low manufacturing cost and with high accuracy by equipping a thickness setting means setting the final thickness of a body to be ground at the maximum feeding position of a grinding member by a cam device. CONSTITUTION:When a grinding member 7 is approached or brought into contact with a belt material A, it is fed up to the maximum feeding position with regulating its feeding by a cam device to grind the belt material A in a preset thickness finally. The control of the max. grinding amount of the grinding member 7 for this belt material A is determined by the shape of the plate cam 41 of the cam device and the belt material A can be ground in a fixed thickness at all times even if a driving motor receives the effect of disturbance. Also, in changing the final thickness of the belt materials A, it can be changed by inserting or changing the thickness setting means of the plate 55.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to, for example, a belt manufacturing process in which a cylindrical belt material (also called a slab) is used after being vulcanized and formed but before being cut into a predetermined belt width. This invention relates to a control device for controlling the amount of grinding (feeding amount) of the belt material in a grinding device for finishing the thickness of the belt material according to standard dimensions by grinding the back surface of the belt material.

[Prior Art] As a device for controlling the amount of grinding when the belt material is ground to a constant thickness by a grinding device, devices having the following configuration have conventionally been generally used.

That is, as shown in FIG. 7, a base 12° on which a grinding machine 3° equipped with an abrasive belt 7° is installed is slidably disposed 2° above the head, and one end 2° above the head is attached. A drive motor 70 is provided in the drive motor 70, and a ball screw rod or feed screw rod 72 connected to the drive shaft of the drive motor 70 via a coupling 71 is screwed into a female screw member 73 fixed to the lower surface of the base 12°. Then, by rotating the threaded rod 72, the grinding machine is brought into contact with the belt material A, which is passed between the main spindle roll 21' and the tension roll 26' held in a fixed position, and rotated. Grind belt material A with a 7° abrasive belt. In this way, when the amount of feed of the abrasive belt 7° relative to the belt material A reaches a preset value, the drive motor is stopped and the grinding work is completed.

In addition, there is a grinding amount control device that uses a hydraulic cylinder instead of the drive motor or threaded rod for moving the grinding machine, and a manual grinding amount control device that does not use any drive motor or other moving device for the grinding machine. There is.

[Problem to be solved by the invention] Among the conventional grinding amount control devices described above, in the control device using the drive motor 70, when trying to improve control accuracy,
Expensive drive motors such as servo motors and pulse motors7
0 is required, which increases manufacturing costs. In addition, when the load resistance acting on the abrasive belt 7' increases during the grinding operation of the belt material A, the rotation of the drive motor 70 is temporarily stopped and feeding to the belt material A is stopped. When performing control, the drive motor 70 is susceptible to disturbances such as noise, so there is a risk that load control may not be performed accurately.

In a control device that uses a hydraulic cylinder as a moving device for a grinding machine, the accuracy of the control of the amount of grinding changes as the oil temperature changes, so the control tends to become unstable, and the amount of grinding by the hydraulic cylinder may vary. control is mechanically difficult.

Manual control devices require a worker to work on the device all the time, resulting in very poor work efficiency and a heavy burden on the worker.

This invention was made in view of the above points, and is less expensive to manufacture than conventional electrically controlled devices using drive motors, is not affected by electrical disturbances, has high precision, and is capable of grinding. It is an object of the present invention to provide a grinding amount control device for a grinding device that can easily change the final thickness of an object to be ground later.

[Means for Solving the Problems] In order to achieve the above object, the grinding amount control device of the present invention rotates at least one of a grinding member such as a grinding wheel or an abrasive belt, and an object to be ground such as a belt material. A grinding amount control device for a grinding device for grinding a workpiece to a constant thickness by holding either one in a fixed position and bringing the other into contact and further feeding the workpiece, the grinding amount control device comprising: a) said grinding member or said workpiece; a) a feeding device for feeding one of the objects to be ground while making contact with the other; b) a cam device for regulating the feeding in stages to a preset maximum feeding position; and a thickness setting means for setting the final thickness of the workpiece at the maximum feed position.

[Function] The grinding amount control device of the present invention having the above configuration,
For example, when grinding a belt material as an object to be ground to a constant thickness, the belt material is rotated in a fixed position, and a rotating or non-rotating grinding member is brought closer to the belt material by a feeding device. When the grinding member approaches or comes into contact with the belt material within a predetermined range, the feeding of the grinding member is regulated by the cam device, and the grinding member gradually moves toward the belt material while being regulated by the cam device to the maximum feeding position. (in stages), and finally the belt material is ground to a preset thickness. Therefore, control of the maximum grinding amount of the grinding member relative to the belt material is determined by the cam shape (step) of the cam device, so if the drive motor used to rotate the cam device (in the case of a rotary type) is Even if influenced by
The accuracy of the maximum grinding amount of the grinding member relative to the belt material is not affected at all, and the belt material can always be ground to a constant thickness.

In addition, when changing the final thickness of the belt material after grinding, a thickness setting means such as a plate is inserted into the contact position with the cam device, or the previously inserted thickness setting means is replaced. As a result, the amount of grinding is regulated by the cam device, and the final finished thickness of the belt material that has been ground can be changed.

In contrast to what has been described above, the same effect as described above is achieved even when the belt material is fed into contact with the grinding member held in a fixed position.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 4 is an overall schematic front view showing a belt material grinding apparatus equipped with a grinding amount control device according to an embodiment of the present invention, and FIG. 5 is a plan view thereof.

First, the overall configuration of the grinding device will be described. As shown in FIGS. 4 and 5, a belt grinder 3 is installed on one side (on the left side of the figure) of the bed 2 of the grinding device 1.

The belt grinding machine 3 has a known structure, with a contact wheel 4 disposed near the center of the bed 2, a drive wheel 5 disposed at one end of the bed 2, and an upper position approximately midway between both wheels 4 and 5. tension wheel 6
A coated abrasive belt 7 (referred to as Sangu paper) is continuously passed through the belt. Further, the contact wheel 4 and the drive wheel 5 are set at the same height. A dust collector 8 is disposed below both wheels 4 and 5, and a suction device (not shown) connected to one end of the dust collector 8 sucks up the grinding powder generated during grinding work. It is designed to collect dust. The drive wheel 5 is connected by a drive belt IO to a drive motor 9 provided at the lower end of the bed 2, and the drive motor 9 rotates the drive wheel 5.

The tension wheel 6 is rotatably supported between a pair of brackets 6a, and the tension wheel 6 is rotatably supported between a pair of brackets 6a.
One end is pivotally supported by a support member 6b, and the other end is connected to a tension cylinder 6c, so that tension is applied to the abrasive paper belt 7 by the extension movement of the tension cylinder 6c. Furthermore, a tracking cylinder 6d is connected to one end of one of the brackets 6a, and as the tracking cylinder 6d expands and contracts, one end of the tension wheel 6 swings left and right, causing the abrasive cloth belt 7 to meander appropriately. It looks like this. Note that by making the abrasive cloth belt 7 meander during grinding work, the belt 7
The life of the belt material is extended, and the finish of the belt material A (FIG. 6), which will be described later, is improved.

A rotating support device 11 for the belt material A is provided on the other side of the bed 2 (on the right side in the figure). This rotation support device 1
1 consists of the following configuration.

That is, a base 12 is disposed on the bed 2 via a linear motion bearing 13 so as to be horizontally movable. In this embodiment, one end of a hydraulic cylinder 15 as a feeding device is connected to the lower end of the support piece 14 extending downward from the base 12, and the other end is connected to the bed 2, so that the hydraulic cylinder 15 can expand and contract. The base 12 approaches and moves away from the belt grinder 3 as a result of the movement.

The work roll 21 is arranged at one end of the base 12 (near the center of the bed 2) so as to face the contact wheel 4 of the belt grinder 3 and to have its axis at the same height as the wheel 4. There is. One end of the work roll 21 is rotatably supported by a support member 22 erected on one side of the base 12 via a bearing (not shown), and the other end of the work roll 21 is supported by a rotation center 23. It is rotatably supported. The rotation center 23 swingably supports a support member (
The rotary center 23 is attached to a tailing fitting 24 supported by a spindle (not shown), so that the rotation center 23 can be removed from the end of the work roll 21 when the belt material A is attached to or removed from the work roll 21.

A plurality of idler shafts 26 having an outer diameter considerably smaller than the work roll 21 are rotatably disposed on the base 12 at predetermined intervals via support members (not shown). Although not shown, the support member at one end of the idler shaft 26 can be removed from the idler shaft 26 when attaching or removing the belt material A.

As shown in FIG. 6, the cylindrical belt material A after vulcanization is passed between the work roll 21 and the idler shaft 26. As shown in FIG. In this embodiment, a case is shown in which a belt material having the minimum diameter (currently φ29m1+) for a small toothed belt is ground as the bell member A. For this reason, work roll 2
A tooth groove 21a corresponding to the tooth profile of the small toothed belt material A is formed on the circumferential surface of the belt member 1. A frame-shaped lever 28 with a tracing plate 27 as a sliding member, which is arc-shaped so as to follow the small toothed belt material A on the work roll 21, is installed at the tip, or a pivot shaft that can freely rotate in the vertical direction. 28a, and is biased upward by an air cylinder 29 (FIG. 4) serving as a biasing means, so that the copying plate 27 is attached to the lower part of the work roll 21 (
It is pressed against the small toothed belt material A (on the opposite rotational direction side with respect to the contact portion with the abrasive paper belt 7). Further, above the frame-shaped lever 28, a frame-shaped lever 31 (FIGS. 4 and 5), which has a rotatable squeeze roll 30 installed at its tip, is mounted on a pivot shaft that can freely rotate in the vertical direction. 31a and is biased downward by an air cylinder 32 (FIG. 4) serving as a biasing means, the squeezing roll 30 rotates relative to the upper part of the work roll 21 (the contact area with the abrasive cloth belt 7). direction)
It is pressed against the small toothed belt HA. The work roll 21 is rotated by a drive motor 34 via a drive belt 33 as shown in FIG. The direction of rotation of the work roll 21 is clockwise, and the direction of rotation at the contact portion between the coated abrasive belt 7 of the belt grinder 3 and the belt material A is opposite. As shown in FIG. 6, the small toothed belt material A rotates clockwise as the work roll 21 rotates, but at this time, the copying plate 27 is pressed against the belt material A at the lower part of the work roll 21. , rotation of belt material A is suppressed. At the same time, the squeezing roll 30 is pressed against the belt material A at the upper part of the work roll 21.
The belt material A is squeezed along the circumferential surface of the work roll 21. Therefore, as shown in the figure, the belt material A is slightly slack in areas other than the attachment point C with the work roll 21, and is close to the state in which the belt (final product) is used.

In FIG. 4, the hydraulic cylinder 15 is contracted and the base 1
2 approaches the belt grinding machine 3, and the belt material A comes into contact with the abrasive coated paper belt 7 on the contact wheel 4 under the condition shown in FIG. However, in the case of a small toothed belt, the amount of grinding on the back surface of belt material A is very small, about 1 mm. Therefore, the amount of grinding of the belt material A is adjusted by the grinding amount control device of the present invention.

Hereinafter, the grinding amount control device 40 according to an embodiment of the present invention will be explained in detail.

That is, as shown in FIGS. 1 and 2, a pair of bearing members 42 are provided on the rear end surface of the bed 2 at a constant interval and protrude rearward, and there is approximately a space between each bearing member 42. A circular plate cam 41 is rotatably supported by a rotary shaft 43, and one end (base end) of the rotary shaft 43 is coupled to a drive shaft of a low-speed drive motor 44 fixed to the rear end surface of the bed 2.
6, they are connected so as to be integrally rotatable. The plate cam 41 is
The protrusion 41a is provided so that the maximum grinding amount (maximum feed amount) for the belt material A, in other words, the maximum step (difference between the minimum diameter and the maximum diameter of the plate cam 41) is set to 1 mm in this embodiment. There is.

The low speed drive motor 44 also includes the belt grinder 3.
When the current value of the drive motor 9 exceeds a set current, rotation stops, and when the current value falls below the set current, rotation starts, so-called a control circuit that drives the drive motor 9 while controlling the load is incorporated.

The other end (tip) of the drive shaft 43 is provided with a mechanism for stopping the rotation of the plate cam 41 when the temporary cam 41 has rotated to the maximum feed position, and then returning the temporary cam 41 to the rotation start position (origin). A switch operation (auxiliary) plate cam 47 is attached, and a limit switch 45 that comes into contact with the operation plate cam 47 is fixed to the rear end surface of the bed 2.

On the other hand, a guide member 52a is provided protruding from the rear portion of the lower surface of the base 12 in the direction of the potato, and a pair of supports 52 are vertically and slidably provided along the guide member 52a. A roller bearing 51, which is a driven contact of the plate cam 41, is rotatably provided between each support body 52.

Further, a plate mounting member 5 is attached to the rear end of the lower surface of the base 12.
3 is placed below. This plate mounting member 53
A plate mounting plate 53a is provided on the lower end surface of the plate 53a to extend toward the front (head 2), so that a thickness setting plate 55 serving as a means for setting the thickness of the belt material A can be placed on the mounting plate 53a. It has become. This thickness setting plate 55 is
This plate is used to determine the final thickness of the belt material A after the grinding work is completed. Reference numerals 56 and 57 in FIG. 1 are stopper members for regulating the frontmost position of the base 12 on the head 2.

Next, regarding the belt material grinding device of the above-mentioned embodiment,
Its usage and operation will be explained.

In Figure 1, Figure 2 or Figure 4, ■ Work roll 2
1 and the idler shaft 26, the belt material A to be ground is passed. (2) Set the belt thickness setting plate 55 on the mounting plate 53a of the plate mounting member 53. (2) The abrasive cloth belt 7 of the belt grinder 3 is rotated clockwise by the drive motor 9. - Drive the suction device of the dust collector 8 to collect cutting dust. ■Drive motor 3
4, the work roll 21 is rotated, and the belt material A is rotated clockwise. (2) After the air cylinder 32 is extended to press the squeezing roll 30 against the belt attachment on the work roll 21, the air cylinder 29 is contracted to press the tracing plate 27 against the belt attachment.

(2) The rotation support device 11 is gradually brought closer to the belt grinder 3 by contracting the hydraulic cylinder 15. ■Hydraulic cylinder 15
With the contraction of the base 12, the base 12 slides forward on the head 2, the support body 52 is pushed forward via the plate mounting member 53 and the thickness setting plate 55, and the roller bearing is attached to the protrusion 41a of the plate cam 41. At the same time as 51 makes contact,
Start rotating the plate cam 41 clockwise by the low speed drive motor 44.

In this state, the back surface of the belt material A on the work roll 21 comes into contact with the coated abrasive belt 7 on the contact wheel 4, and the grinding operation is started. In this way, by the temporary cam 41,
While the amount of grinding of the abrasive cloth belt 7 (on the contact wheel 4) against the belt material A (on the work roll 21) is regulated, the abrasive cloth belt 7 gradually cuts into the belt material A as the plate cam 41 rotates. The grinding work progresses. As described above, when the load resistance acting on the abrasive cloth belt 7 increases and the current value of the drive motor 9 of the belt grinder 3 becomes larger than the set value, the plate cam 41 stops rotating, and conversely, the load resistance increases. When the current value decreases and returns to below the set value, the plate cam 41 rotates and is automatically controlled. ■The plate cam 41 rotates almost once, and the temporary cam 4 rotates against the roller bearing 21.
When the minimum diameter position 1 is reached, the amount of feed of the abrasive cloth belt 7 to the bearing material A becomes maximum, and the bearing material A is ground to a thickness preset by the belt operator. At the same time, the limit switch 45 is operated by the auxiliary plate cam 47, the drive motor 44 is stopped, and the rotation of the plate cam 41 is stopped. [Co., Ltd.] After the grinding work of the belt material A continues for several seconds from the state (2) above, the hydraulic cylinder 15 is rapidly extended to return the rotary support device 11 from the belt grinder 3 to its original position. ■The squeeze roll 30 and copying plate 27 are moved to the air cylinder 3.
After contracting the air cylinder 2 and extending the air cylinder 29 to separate them from the belt material A on the work roll 21, the rotation of the belt material A is stopped. At the same time, the abrasive cloth belt 7 of the belt grinder 3 stops rotating. Further, the drive of the suction device of the dust collector 8 is also stopped. Furthermore, the plate cam 41 also rotates and returns to the origin position, which is the rotation start reference point. In addition,
The origin position of the temporary cam 41 is detected by the auxiliary plate cam 47 and the limit switch 45 in contact with the auxiliary plate cam 47.

■Finally, the ground belt material A is removed from the work roll 21 and the idler shaft 26, and the grinding work is completed.

Incidentally, in the above embodiment, the thickness setting plate 55 is attached to the plate attachment member 53, but as shown in FIG. A correction plate 54 may be attached to the attachment member 53. Furthermore, in the above embodiment, when the hydraulic cylinder 15 is contracted, the base 12
Although the base 12 is moved forward, the base 12 may be moved forward when the hydraulic cylinder 15 is extended. Furthermore, a grinding wheel type grinding machine may be used instead of the belt grinding machine 3.
Also, contrary to the above embodiment, the object to be ground, such as the belt material A, is held in a fixed position, and the grinding machine is brought close to the object to be ground.
They may be spaced apart. Furthermore, the object to be ground is not limited to the belt material A, but can also be used to grind molds and gears, for example.

[Effects of the Invention] As is clear from the above explanation, the grinding amount control device for a grinding device of the present invention has the following effects.

That is, compared to a conventional device that is electrically controlled using a drive motor, the structure is simple and the manufacturing cost is low because it is made of relatively inexpensive components. In addition, the amount of grinding (
Since the feed rate (feed amount) is controlled by a cam device, it is not easily affected by electrical disturbances, and highly accurate and stable control is achieved, allowing the workpiece to be ground to a preset thickness.

Furthermore, since the thickness of the object to be ground can be set by the thickness setting means, the finishing (final) thickness of the object to be ground can be easily changed.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the grinding amount control device of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a front view showing a grinding amount control device according to another embodiment of the invention. It is a diagram. FIG. 4 is an overall schematic front view showing a belt material grinding device equipped with a grinding amount control device according to an embodiment of the present invention, FIG. 5 is a plan view of the same, and FIG. It is an enlarged front view. FIG. 7 is a schematic front view showing a grinding amount control device of a conventional grinding machine. 1...Grinding device, 2...Bed, 3...Grinding machine,
7... Abrasive cloth belt (grinding member), 40... Grinding amount control device, 41... Temporary cam, 44... Drive motor,
45...Limit switch, 47...Plate cam for switch operation, 51...Roller bearing, 53...Plate mounting member, 53a...Fixing plate, 54.55...
・Plate, A... Belt material (object to be ground).

Claims (1)

[Scope of Claims] At least one of a grinding member such as a grinding wheel or an abrasive belt and an object to be ground such as a belt material is rotated, and one of the objects is held in a fixed position while the other is brought into contact with the object to be ground. A grinding amount control device for a grinding device for grinding an object to be ground to a constant thickness, the device comprising: a feeding device for bringing one of the grinding member or the object to be ground into contact with the other and feeding further; The present invention includes a cam device for regulating stepwise up to a preset maximum feed position, and a thickness setting means for setting the final thickness of the workpiece at the maximum feed position of the grinding member by the cam device. Features: Grinding amount control device for grinding equipment.