JP2000343426A - Truing method for grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform truing of a grinding device with high precision without being affected by thermal deformation of the grinding device. SOLUTION: In a truing method for a grinding wheel 17 of a grinding device supplying a workpiece 5 to a machining position A to grind the workpiece 5 at the machining position A by the grinding wheel 17, a truer 14 having the same shape as the workpiece 5 is supplied to the machining position A of the workpiece 5, and the truer 14 is ground at the machining position A by the grinding wheel 17 to perform truing of the grinding wheel 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of truing a grinding wheel.

[0002]

2. Description of the Related Art Some grinding devices such as a cylindrical grinder and an inner surface grinder are provided with a truing device for performing truing (forming dressing) of a dropped grinding wheel. For example, as shown in FIG.
02, a work 103 is attached to the work 103, and the outer peripheral groove 103a of the work 103 is ground by the grinding wheel 105 of the grindstone head 104. The headstock 101 is provided with a truing device 106, and the truing device 106 has a truer (forming dressing grindstone). ) 107 is pressed against the grinding wheel 105 to perform truing of the grinding wheel 105.

[0003]

However, in the grinding device provided with the truing device 106, since the processing position A1 and the truing position A2 are different, the processing position A1 and the truing position A2 are affected by the thermal deformation of the grinding device. The distance between them and the relative distance of the grinding wheel 105 from the processing position A1 and the truing position A2 fluctuate, and there is a problem that the truing of the grinding wheel 105 cannot be performed with high accuracy.

[0004] The present invention has been made in view of the above problems, and it is an object of the present invention to provide a truing method of a grinding wheel that can accurately perform truing of a grinding device without being affected by thermal deformation of the grinding device. Things.

[0005]

According to a first aspect of the present invention, there is provided a grinding apparatus for supplying a work to a processing position and grinding the work with a grinding wheel at the processing position. In the method of truing a grinding wheel, a truer having the same shape as the workpiece is supplied to a processing position of the workpiece, and the truer is ground by the grinding wheel at the processing position, thereby performing the truing of the grinding wheel.

In the first means, since the truing of the grinding wheel is performed at the processing position of the work, the processing position and the truing position are the same, and the truing position is not affected by the heat of the grinding device.
Truing of grinding wheels can be performed with high precision.

Further, as a second means, the present invention provides a truing method of a grinding wheel in a grinding apparatus for supplying a work to a processing position and grinding the work with a grinding wheel at the processing position. By unloading the unprocessed workpiece, supplying a truer having the same shape as the workpiece to the workpiece processing position, and grinding the truer with a grinding wheel at the processing position, the truing of the grinding wheel is performed. The truer is unloaded, the unloaded unworked workpiece is supplied to the work processing position, and the unloaded truer is held at a fixed position.

In the second means, the truing operation of the grinding wheel can be interrupted while the workpiece is being ground sequentially. When the truing of the grinding wheel is completed, the workpiece is continuously ground. be able to.

Further, as a third means, according to the present invention, the truer is supplied to a processing position every predetermined number of times of processing a workpiece. By doing so, the grinding wheel can be trued regularly.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a grinding apparatus capable of carrying out the truing method of a grinding wheel according to the present invention. This grinding device comprises a headstock 2 and a grinding wheel head 3 provided on a bed 1. The headstock 2 is provided with a main shaft 4 that can be driven to rotate, and the main shaft 4 has a built-in electromagnetic chuck (not shown) for holding the work 5 (hereinafter, the work 5 is attached to the main shaft 4 by the electromagnetic chuck). The mounting position is referred to as a processing position A.) The work 5 has an outer peripheral groove 5a to be ground by a grinding wheel 17 described later.

As shown in FIG. 2, two shoes 6 and 7 for supporting the work 5 at the processing position A from below and from the side are provided near the main shaft 4, and the work 5 at the processing position A is obliquely upward. And an unloading cylinder 8 for pushing out and unloading. Around the headstock 2, a work supply guide 9 for supplying the unprocessed work 5 from diagonally above to the processing position A, a work discharge guide 10 for discharging the processed work 5 diagonally below, and a truer supply cylinder 11.
Is arranged.

The work supply guide 9 has a stopper 12a.
The workpiece supply stop cylinder 12 is provided for stopping the supply of the unprocessed workpiece 5 by moving the workpiece into and out of the workpiece supply guide 9. Further, the work discharge guide 10 is provided with a work discharge stop cylinder 13 for stopping the discharge of the unloaded work 5 by moving the stopper 13a to and from the work discharge guide 10 (hereinafter, the cylinder 13 will be referred to as a cylinder 13). The position where the work 5 is stopped by the stopper 13a is referred to as a stop position B.) Truer supply cylinder 11
Is provided with a chuck 11a for holding the truer 14 (hereinafter, a position where the truer 14 is held by the chuck 11a is referred to as a standby position C).
The work discharge stop cylinder 13 can not only stop the discharge of the unloaded work 5 but also push up the discharge-stopped work 5 from the stop position B to the standby position C of the truer supply cylinder 11. ing. The truer supply cylinder 11 can supply the truer 14 held by the chuck 11a from the standby position C to the processing position A of the workpiece 5. The processing position A, the stop position B, and the standby position C of the work 5 form a triangle as shown in FIG.

The unload cylinder 8, the truer supply cylinder 11, the work supply stop cylinder 12, and the work discharge stop cylinder 13 are driven by a hydraulic control device 15.

On the other hand, the grindstone table 3 is provided with a wheel spindle 16 that can be driven to rotate, and the wheel spindle 16 is provided with a grindstone shaft 18 having a grinding grindstone 17 at the tip. The grinding wheel head 3 is moved in the horizontal direction (Z
Direction), and AC (not shown)
The servo motor is capable of reciprocating in the vertical direction (X direction).

Next, a method of processing the workpiece 5 and truing the grinding wheel 17 in the grinding apparatus having the above-described configuration will be described with reference to the flowchart of FIG.

At the time of processing the work 5, as shown in FIG.
The work 5 is retracted from the work supply guide 9 as shown by the dashed line and the work 5 is supplied to the processing position A. Similarly, the stopper 13a of the work discharge stop cylinder 13 is retracted from the work discharge guide 10 as shown by the dashed line. On the other hand, the chuck 11a of the truer supply cylinder 11 has a truer 1
4 is attached.

[0018] First, in step 101, the value obtained by subtracting the processed count N _G from dress skip number N _D (N _D -N _G)
Is determined to be zero. Here, the dress skip number N _D, the number of skip molding Dress (truing), i.e., a machining pass of the workpiece to be next truing after performing truing, as set in advance (an example, the In the embodiment, it is 50 times.) The processing count number _NG indicates the number of times the workpiece has been processed, and is counted each time one workpiece 5 is processed.

If N _D -N _G is zero, that is, if the processing count number _NG has not reached the dress skip number N _D , the work 5 at the processing position A is ground in step 102. For this purpose, the grindstone head 3 is moved in the X-axis and Z-axis directions by driving the AC servomotor 19 and other servomotors to approach the work 5. Then, the main shaft 4 and the wheel spindle 16 are rotated at a high speed, and at the same time, the grinding wheel base 3 is raised to perform a grinding process.

When the grinding is completed, step 103
Then, after setting the processing count number to 1 by setting _NG = _NG + 1, the unprocessed work 5 is unloaded by driving the unload cylinder 8 in step 104 and discharged along the work discharge guide 10. In step 105, the unprocessed work 5 is loaded to the processing position.

[0021] In this way machining cycle of the workpiece 5 is repeated, with the processing count N _G increases reaches a predetermined address skip number N _D, the N _D -N _G is zero at step 101, truing cycle Move to That is, in step 106, the work supply stop cylinder 12
To stop the supply of the work 5 by moving the stopper 12a into the work supply guide 9 as shown by the solid line in FIG. Next, at step 107, the work discharge stop cylinder 13 is driven to stop the stopper 13a as shown by the solid line in FIG.
Into the work discharge guide 10 to stop the discharge of the work 5.

In this state, the unload cylinder 8 is driven in step 108 to unload the unprocessed work 5 at the processing position A. Thus, the unprocessed work 5 is stopped at the stop position B by the stopper 13a of the work discharge stop cylinder 13. In step 109, the truer supply cylinder 11 is driven to supply the truer 14 held by the chuck 11a from the standby position C to the processing position A. Then, in step 110, the processing position A
The truing of the grinding wheel 17 is performed by treating the truer 14 supplied to the workpiece 5 with the grinding wheel 17 while considering the workpiece 5.

The truing of the grinding wheel 17 is performed by the work 5
Since it is performed at the processing position A, it can be performed with high accuracy without being affected by the heat of the grinding device. In addition, since the truing of the grinding wheel 17 is performed in the same manner as the processing of the work 5, it is not necessary to separately provide a truing device for the grinding wheel 17 in the grinding device, and it is necessary to perform special control on the grinding wheel 17 during truing. Absent. Further, since the truing of the grinding wheel 17 is performed by the truer 14 having the same shape as the workpiece 5,
The grinding wheel 17 can be formed in the same shape as the work 5.

When the truing of the grinding wheel 17 is completed, the workpiece discharge stop cylinder 13 is driven in step 111 to raise the unprocessed work 5 at the stop position B and move it to the standby position C. The unprocessed work 5 is held by the chuck 11 a of the truer supply cylinder 11. Next, in step 113, the work discharge stop cylinder 13 is driven to return the stopper 13a to the stop position B to enter the work discharge guide 13a. Then, in step 114, the unload cylinder 8 is driven to Unloads the truer 14 located at. As a result, the truer 14 is stopped at the stop position B by the stopper 13a of the work discharge stop cylinder 13. Then, in step 115, the truer work cylinder 5 held by the chuck 11a is supplied from the standby position C to the processing position A by driving the truer supply cylinder 11.

Then, by driving the work discharge stop cylinder 13 in step 116, the truer 14 at the stop position B is raised and moved to the standby position C. In step 117, the truer 14 is chucked by the chuck of the truer supply cylinder 11. 11a. Thereafter, in step 118, the work supply stop cylinder 12 is driven to retract the stopper 12a from the work supply guide 9 as indicated by a two-dot chain line, and in step 119, the work discharge stop cylinder 13 is driven to stop the stopper 13a. 2
The workpiece is ejected from the work discharge guide 10 as shown by the dotted line. As a result, preparation for continuing the processing of the work 5 is completed,
In step 120, the work processing count number _NG is returned to zero, the flow returns to step 101, and the processing cycle of the work 5 described above is continued.

As described above, every time the grinding cycle of the work 5 is repeated a predetermined number of times, the process smoothly shifts to the truing cycle of the grinding wheel 17 and can quickly return to the work cycle of the work 5. There is no long interruption due to truing. In addition, the grinding wheel 17 can be trued periodically, and the work 5
It is possible to suppress the variation in the processing accuracy.

In the above-described embodiment, the method of truing the grinding wheel 17 in the grinding device for grinding the outer peripheral groove 5a of the work 5 has been described, but the inner peripheral groove 21a of the work 21 as shown in FIG. Grinding machine 22 with a grinding wheel 22 or a work 23 as shown in FIG.
In a grinding apparatus for grinding the annular groove 23a on the end face of the workpiece with a cup-shaped grinding wheel 24, the truing method according to the present invention is carried out by preparing the truers 25 and 26 having the same shape as the works 21 and 23. Can be.

[0028]

As is clear from the above description, according to the first aspect of the present invention, since the truing of the grinding wheel is performed at the processing position of the workpiece, the truing of the grinding wheel can be performed without being affected by the heat of the grinding device.
Truing of grinding wheels can be performed with high precision. Further, it is not necessary to separately provide a truing device for the grinding wheel in the grinding device, and the truing of the grinding wheel can be performed in the same manner as the processing of the work, so that there is no need to perform special control on the grinding wheel at the time of truing. Further, since the truing of the grinding wheel is performed with a tool having the same shape as the workpiece, the grinding wheel can be formed into the same shape as the workpiece.

Further, according to the second aspect of the present invention, it is possible to smoothly shift to the truing of the grinding wheel while sequentially performing the grinding of the workpiece, and to quickly return to the grinding of the workpiece. The work cycle of the work can be shortened.

Further, according to the third aspect of the present invention, since the lure is supplied to the processing position every predetermined number of times of processing of the work, the grinding wheel can be trued periodically, and the processing accuracy of the work can be improved. Variation can be suppressed.

[Brief description of the drawings]

FIG. 1 is a front view of a grinding apparatus capable of implementing a truing method of a grinding wheel according to the present invention.

FIG. 2 is a sectional view taken along line II of the grinding apparatus of FIG. 1;

FIG. 3 is a flowchart showing a truing method of the grinding wheel of the present invention in the grinding apparatus of FIG. 1;

FIG. 4 is a cross-sectional view showing another shape of the work.

FIG. 5 is a partial front view of a conventional grinding device provided with a truing device.

[Explanation of symbols]

 5, 22, 24 Work 14, 25, 26 Truer 17 Grinding wheel A Processing position B Stop position C Standby position

Claims (3)

[Claims] 1. A truing method of a grinding wheel in a grinding device for supplying a work to a processing position and grinding the work with a grinding wheel at the processing position, wherein a truer having the same shape as the work is supplied to the processing position of the work. A truing method of the grinding wheel, wherein the truing of the grinding wheel is performed by grinding the truer at the processing position with a grinding wheel. 2. A truing method of a grinding wheel in a grinding device for supplying a work to a processing position and grinding the work with a grinding wheel at the processing position, wherein the unworked work at the processing position is unloaded; A truer having the same shape as the above is supplied to the processing position of the workpiece, and the truer is ground by the grinding wheel at the processing position, thereby performing truing of the grinding wheel, unloading the truer at the processing position, and unloading the truer. A truing method for a grinding wheel, comprising: supplying an unprocessed work to a work processing position of the work; and holding the unloaded truer at a fixed position. 3. The truing method for a grinding wheel according to claim 1, wherein the truer is supplied to a processing position every predetermined number of times of processing the workpiece.