JPH04164568A - Correction method for grinding wheel of duplex head grinder - Google Patents

Abstract

PURPOSE:To reduce the dispersion in accuracy, and to make the work dimension in a highly accurate one after the grinding wheel correction, by finding the respective differences in the positions of the correction action part of a tool for correction, prior to correcting a grinding wheel face and after the correction, correcting the difference in the positions of the correction action part, and advancing it. CONSTITUTION:The positions of the correction action part 13 of each tool 5 for correction of a grinding wheel correction device are measured by measuring instruments G1, G2 prior to correcting a grinding wheel face 9 by a grinding wheel correction device and after the correction, and the respective differences of the positions of the correction action part 13 of each correcting tool 5 of the grinding wheel correction device are found. Then the advance position to a grinding position of a grinding wheel 2 after its correction is advanced more than the grinding position where the grinding wheel 2 is located prior to the grinding wheel correction, by correcting the differencein the positions of the correction action part 13 of before and after the grinding wheel correction of the correcting tool 5.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a grindstone correction device for a double-headed grinder.

``Prior Art'' A grinding wheel correction device for a double-headed grinder is shown in FIGS. 7 and 8. In the figure, a double-headed grindstone head 3 is provided with grinding wheels 2 fixed to the ends of the grindstone shaft facing each other with the grinding surfaces (referred to as grindstone surfaces 9) facing each other, which are arranged to be rotationally driven on the bed 1. The grindstone 2 on the left side and the grindstone 2 on the right side can be adjusted in their left and right positions. This adjustment takes place with a screw feed device 12 connected to a feed motor 11. A grindstone correction device 4 is attached to the bed 1.

The grindstone correction device 4 has an arm 7 fixed to a rotatable base shaft 6 parallel to the grindstone axes of both the grinding wheels 2 on the outside in the radial direction of the outer periphery of both the grinding wheels 2 . The tip of the arm 7 is arranged so as to pass along the end surfaces of both grinding wheels 2. A grindstone correction tool 5 is provided at the tip of the arm 7. The tool 5 for repairing the grindstone includes a weighted diamond, a rotary diamond roll, etc., but in the present invention, they can be handled in the same manner, so for the sake of simplicity, they are illustrated as a weighted diamond.

The base shaft 6 is driven by a belt device 8 from an electric motor 10 that repeats forward and reverse rotation, and swings the correction arm 7. .

When the grinding wheels are being corrected, the grinding wheels 2, 2 are rotating.

The electric motor 10 is energized to swing the correction arm 7, and the grindstone correction tool 5 is reciprocated by approximately the radial length of the grindstone surface 9 of the grindstone 2 to change the feeding direction. When the grinding wheel 2.2 is cut toward the grinding wheel correction tool 5, the grinding wheel faces 9, 9 are successively corrected by the radial feed. In this way, the grinding wheel correction tool 5 is fed, but on the other hand, the grinding wheel 2
．． The method of adjusting the grindstone from the point of view of advance and retreat, that is, cutting depth, is shown in FIG.

Here, for the sake of explanation, the workpiece W is the grindstone correction tool 5.
, 5, and the amount of movement S is also the same for each.

As shown in Fig. 5fA), the grinding wheels 2, 2 have a grinding dimension of
Both sides of the workpiece W are simultaneously ground with the grindstone surfaces 9.9 facing each other. The dimensions of the workpiece W are measured so that the grinding dimension or manually managed.

When correcting the grinding wheels, as shown in FIG.
to retreat. As a result, the tip of the grinding wheel correction tool 5.5, that is, the grinding wheel surface 9.
9 will be located.

Next, as shown in FIG. 5(C), both grindstones 2.2 are advanced by a corrected depth of cut C.

Here, when the correction arm 7 is swung to correct the grindstone surfaces 9, 9 as shown in FIG. 5fDl, the distance between the opposing grindstone surfaces 9, 9 becomes X+23.

As shown in FIG. 5 (El), when the grindstone 2.2 is moved forward by the amount of movement S, the distance between the grindstone surfaces 9.9 of the grindstone 2 becomes the two-grinding dimension X.

Incidentally, when the grinding dimensions X in FIG. 5(A) are poorly managed and the grinding wheels 2, 2 are moved back by the amount of movement S, the correction action portion 13 of the correction tool 5 and the grinding wheel surfaces 9, 9 will change as shown in FIG. 5(A). The result is the same even when they do not match as in B).

It would be ideal if the grindstone was corrected as described above, but in actual grindstone correction, the correction tool 5 wears out during the correction.
It will be written below.

FIG. 6 shows the grindstone correction process when the correction tool wears out.

Here, for the sake of explanation, the workpiece W is the grindstone correction tool 5.
．． 5, and the amount of movement S is also the same for each.

Figure 6 (A) shows that the distance between the correction tools 5 is not worn.
Assume that the starting point is +23, and the grinding dimension is X.

FIG. 6(B) is a diagram in which the grinding wheel 2.2 has been moved back by a moving amount S, and as a result, the distance between the grinding wheel surfaces 9.9 becomes X+23 as in FIG. 5(B).

Grinding wheel 2 as in Fig. 6 (Fig. 5 fc as shown in C1)
, 2 is corrected When the cutting wheel is corrected by the cutting depth C,
The correction tool 5.5 during correction as shown in Figure 6 (Dl)
If the tool wear amounts are Wl and W2, the distance between the grinding wheel surfaces 9.9 will not be X+23, but will be X+23- (W
1+W2). As shown in Fig. 6fE, when the grinding wheel 2.2 is advanced by the amount of movement S, the grinding dimension changes from the required grinding dimension X to (W1
+W2), the value X2=X-(Wl, +W2). That is, the width of the ground surface of the workpiece W is W1+W
It becomes smaller by 2.

``Problems to be Solved by the Invention'' Conventionally, in order to prevent the reduction in workpiece size due to the wear of the correction tool as described above, a numerical control device for advancing and retracting the grinding wheel 2.2 was used. fD) After the completion of the grindstone correction, the estimated amount Wg of the corrected tool wear Wl and W2 after the completion of the grindstone correction is input into the program in advance, and the amount of movement to advance the grindstones 2, 2 to the grinding position after the grindstone correction is determined by S- A method of using Wg is being used.

If this is done, the actual tool wear amount of the correction tool 5 will vary, but since the correction tool wear amount Wg is estimated, it will differ from the actual correction tool wear amount.

In particular, when the repair tool is replaced or the grindstone is changed, the tool wear amount of the repair tool often changes, and the actual tool wear amount Wl, W2 and the estimated repair tool wear amount Wg differ greatly. There are cases where the workpiece size does not immediately reach the desired value after being corrected.

Regardless of the amount of wear of the grinding wheel correction tool, the present invention can
It is an object of the present invention to provide a method for correcting a grinding wheel for a double-headed grinder in which the grinding dimensions after the grinding wheel correction are always constant.

"Means for Solving the Problems" The first aspect of the present invention is to move the grindstone at a grinding position for grinding a workpiece backward, move it to a grindstone correction position where the grindstone surface is corrected by a correction tool, and In the grindstone adjustment method, the grindstone surface is corrected by a correction device, and after the grindstone correction, the grindstone is advanced to the grinding position, and the grindstone is stopped at the grinding position to perform grinding.
A measuring device is provided to measure the position of the correction action part of the correction tool of the grindstone correction device, and the position of the correction action part of each correction tool of the grindstone correction device is measured before and after the grindstone surface is corrected by the grindstone correction device. Measure with the measuring device, find the difference in the position of the correction action part of each correction tool, and determine the forward position of the grindstone to the grinding position after correction of the grindstone, compared to the grinding position where the grindstone was located before correction of the grindstone. A method for correcting a grindstone for a double-headed grinder, characterized in that the difference in the position of the correction action part of the correction tool before and after the correction is corrected, and the correction tool is moved forward.

The second invention of the present invention is such that the amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel is greater than the amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel at the time of the previous correction of the grinding wheel. A grindstone correction method for a double-headed grinding machine according to the first invention, characterized in that each difference in position is set to a corrected value.

The third aspect of the present invention is to retreat the grindstone in the grinding position for grinding the workpiece to the position of the correction action part of the correction tool,
The grinding wheel is advanced by applying a correction cutting feed so that the grinding wheel surface is corrected by a correction tool, the grinding wheel surface is corrected by a grinding wheel correction device, and the grinding wheel is advanced to a grinding position after the grinding wheel correction, -
A grindstone correction method in which the grindstone is stopped at the grinding position and grinding is performed, which includes a measuring device for measuring the position of the correction action part of the correction tool of the grindstone correction device, and the grindstone in the grinding position at the time of the grindstone correction is corrected by the previous grindstone correction. After the grinding wheel is corrected, the grinding wheel is moved to the grinding position, the moving distance or equivalent amount is retracted, the grinding wheel is moved forward by giving a corrected cutting feed, and the grinding wheel surface is corrected by the grinding wheel correction device. The position of the correction action part of the correction tool is measured with the measuring device, the difference in the position of the correction action part of each correction tool is determined, and the amount of movement of the grinding wheel to the grinding position after the previous grindstone correction is calculated. A grinding wheel for a double-headed grinding machine, characterized in that the difference between the positions of the correction action part of the correction tool before and after the grindstone correction is corrected from the amount of movement of the grinding wheel to the grinding position after the grindstone correction when the grinding wheel is corrected. Here's how to fix it.

A fourth aspect of the present invention is to retreat the grindstone at the grinding position for grinding the workpiece, move it to a grindstone correction position where the grindstone surface is corrected by a correction tool, and correct the grindstone surface by a grindstone correction device. In the grinding wheel correction method, the grinding wheel is advanced to the grinding position after the grinding wheel is corrected, and the grinding wheel is stopped at the grinding position to perform grinding.
During the grindstone correction, a piece to be ground by the grindstone surface corrected by the grindstone correction tool is attached to the grindstone correction tool, and a measuring device for measuring the position of the piece is provided, and before and after the grindstone surface is corrected by the grindstone correction device. After the correction, the positions of the pieces attached to the grinding wheel correction device are measured by the measuring device, and the differences in the positions of the pieces are determined. This is a method for correcting a grindstone for a double-headed grinding machine, characterized in that the difference between the position of a piece attached to the correction tool before and after the correction of the grindstone is corrected rather than the position, and the piece is moved forward.

The fifth aspect of the present invention is that the amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel is determined by the position of each piece attached to the grinding wheel correction device, which is greater than the amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel at the time of the previous correction of the grinding wheel. A grindstone correction method for a double-headed grinding machine according to a fourth aspect of the present invention, characterized in that the difference between the values is corrected.

The sixth aspect of the present invention is to retreat the grindstone in the grinding position for grinding the workpiece to the position of the correction action part of the correction tool,
The grinding wheel is advanced by applying a correction cutting feed so that the grinding wheel surface is corrected by the correction tool, the grinding wheel surface is corrected by the grinding wheel correction device, the grinding wheel is advanced to the grinding position after the grinding wheel correction, and the grinding wheel is stopped at the grinding position. In the grindstone correction method, the grindstone correction tool includes a piece to be ground by the grindstone surface corrected by the grindstone correction tool during the grindstone correction, and a measuring device for measuring the position of the piece; At the time of correction, the grinding wheel in the grinding position is moved back to the grinding position after the previous grinding wheel correction, or by an equivalent amount, and the grinding wheel is moved forward with a correction cutting feed, and the grinding wheel surface is corrected by the grinding wheel correction device. The positions of the pieces attached to the grinding wheel correction device were measured with the measuring device before and after the correction, the differences between the positions of each piece were determined, and the amount of movement of the grinding wheel to the grinding position after the grinding wheel correction was calculated from the previous grinding wheel correction. A method for correcting a grinding wheel for a double-headed grinder, characterized in that the difference between the positions of the pieces before and after the correction of the grinding wheel is corrected from the amount of movement of the grinding wheel to the grinding position after the actual correction of the grinding wheel.

"Example" Hereinafter, an example of the present invention will be described with reference to the drawings. First, the apparatus for carrying out the present invention will be described. , FIG. 3 is a front view of the double-headed grinder, and FIG. 4 is a sectional view taken along line AA in FIG. 3. The different points from those already explained in FIGS. 7 and 8 will be explained.

The double-headed grinder used in the present invention is a measuring device that measures the correction action part 13 of the grinding wheel correction tool 5, that is, the cutting edge in the case of a heavy diamond, and the outer circumference which is the contact part with the grinding wheel surface 9 of the rotary diamond in the case of a rotary diamond. G, G2
It is equipped with The signals of the position of the corrective action section 13 detected by the measuring instruments Gl and G2 are input to the control device 14, and the control device 14 controls the feed motor 11, which is a servo motor.

The present invention will be explained in detail with reference to FIG. Fig. 1 (Al to (El) shows the grinding wheel correction according to the basic operation order. As shown in Fig. 1 (Al), the grinding wheel 2.2 is machined with grinding dimension Grind both sides of the workpiece W. (Measure the dimensions of the workpiece W so that the grinding dimension (Sizing device) As shown in Fig. 1 (B), when correcting the grinding wheel, the amount of movement Sl, S by which the grinding wheel 2 was moved to the position of the grinding dimension X after the previous correction is
Retract each grinding wheel 2.2 by 2.

As shown in FIG. 1 (C1), the feed motor 11 is driven to move the grindstones 2 and 2 forward by the corrected depth of cut C1°02 using the screw feed device 12, and the grindstone correction tool 5 is moved forward by the measuring instruments Gl and G2. Measure the position of the correction action $13 and send a signal of this measured position to the control device 14, or adjust the measuring device 0. If the shape and size of the grinding surface of W is significantly different on both sides of the workpiece W, uneven wear of the grinding wheel surface 9 will occur, so the corrected cutting depths C1 and C2 are adjusted to the grinding wheel surface 9.9 based on the workpiece W.
Determined by the state of

Note that this tool position measurement can be performed before the grindstone correction is performed, so it can be performed when starting the grindstone correction operation shown in Figure 1 (Bl) (or, it can be performed using the grindstone correction tool that was used after the previous grindstone correction, which will be described later). The measurement position of the correction action section 13 of No. 5 may be stored in the control device 14, and the grindstone correction is performed here.

As shown in FIG. 1 fDl, when the grindstone is corrected, the position of the correction action part 13 of the grindstone correction tool 5 changes by the amount of correction tool wear MW, W2. Here, the position of the correction action part 13 of the grindstone correction tool 5 is measured by the measuring instruments Gl and G2, and a signal of the position is input to the control device 14. The control device 14 compares the position of the correction action part 13 of the grinding wheel correction tool 5 before the current grinding wheel correction measured in FIG. Find the difference.

This difference is the corrected tool wear amounts Wl and W2.

As shown in FIG. 1(E), the control device 14 moves the grinding wheel 2.2 forward after the previous grinding wheel correction.
The difference between Sl, S2 and corrected tool wear amount Wl, W2 is 5L-W,
S2-W2 is calculated respectively, and the feed motor 11 is driven to move the grindstone 2.2 by the screw feed device 12 by a new travel distance of 5 l-.
Send Wl, S2-W2. As a result, the grinding dimension between the grindstone surfaces 9.9 of the grindstone 2.2 becomes X.

In the above, the cutting depths ic and c2 are the total cutting depth, and the actual cutting is performed in parts, and the cutting is performed several times at the end of the swinging stroke of the correction arm 7 (the same applies hereinafter).

In the above, the position of the correction action part 13 of the grindstone correction tool 5 is determined by comparative calculation based on the position of the correction action part 13 of the tool 5 after the previous grindstone correction and before the grindstone correction. Next, an example using absolute calculation will be described.

FIG. 2 shows another embodiment. As shown in FIG. 2 fAl, the state of the grinding position is the same as in FIG. 1 fA).

FIG. 2 fBl shows the grindstone in a state where the correction operation has started. When the grindstone correction operation is started, the measuring instruments Gl and G2 measure the dimensions M 1 , M 2 from the left and right center line 15 of the workpiece W to each correction action part 13 of the grindstone correction tool 5, and The position signal is input to the control device 14 and stored 6
Note that this operation may be performed even before the grindstone correction operation starts. The width of the workpiece W, that is, the grinding dimension X is stored in the control device 14, and the control device 14 stores L1=M1−X.
/2, calculate L2=M2-X/2. Furthermore, the corrected depth of cut C1°C2 is stored in the control device 14, and R1=
Calculate L1-CI, R2=L2-C2.

As shown in FIG. 2(C), the control device 14 controls the feed motor 1.
1 and the screw feed device 12 causes the grindstones 2, 2 to move backward R1, R2, respectively, the grindstone faces 9, 9 are located at the corrected cutting depths C1, C2. The grindstone is corrected here.

Fig. 2 (Measuring instruments Gl and G2 after grinding wheel correction as shown in DJ)
The dimensions Ml' and M2' from the center Ei15 of the workpiece W to the correction action part 13 of the grindstone correction tool 5 are measured, and this signal is input to the control device 14. Control device 14
is the center of the workpiece W before the grindstone correction, which is the memorization point! f915
The dimension Ml from to the correction action part of the grindstone correction tool 5.

Find the difference from M2. That is, corrected tool wear amount Wl=M1
-Ml', W2=M2-M2' are determined.

As shown in FIG. 2 (El), the control device 14 then calculates the previously calculated workpiece center line 15 from the distance ifM, M2 to the correction action part 13 of the grinding wheel correction tool 5, which is half of the grinding dimension
The value Ll using 2 respectively.

The value Jl = L2 minus the corrected tool wear amount W, W2
The feed motor 11 is energized and the screw feed device 12 moves the grindstone 2.2 forward by setting Ll-Wl, J2=L2-W2 as the moving amount. As a result, the distance between the grindstone surfaces 9.9 of the grindstone 2.2 becomes the grinding dimension X.

As mentioned above, the wear amount of the grinding wheel correction tool is found by finding the dimensional difference between the corrected tool position before and after the grinding wheel correction or the grinding wheel surface at the corrected tool position and the grinding position as a comparison value or as an absolute value, and then correct the grinding wheel. By moving the grindstone to the front of the grindstone position at the previous grinding position by the wear amount of the grindstone correction tool, the distance between the grindstone surfaces becomes the grinding dimension X.

In the above, the measuring instrument Gl is used before and after the grindstone correction.

Amount of wear W of the grinding wheel correction tool 5 obtained from measurement by G2
l and W2 also include the case of tool breakage. The values shown as the amounts of wear W and W2 at the time of tool breakage are extremely large values.

The control device 14 can determine the maximum wear amounts Wl and W2 in advance, and when these values are exceeded, it can be determined that the tool is damaged and an alarm can be issued.

Each of the above operations can be automated. Therefore, even if the automatic grindstone (17) is moved back and forth, the grindstone surface remains at a constant position after the grindstone correction, and the workpiece dimensions after the grindstone correction can be made highly accurate.

In the embodiments described so far, the position of the cutting edge of the grindstone correction tool is measured at a total of -11 points by measuring instruments Gl and G2.

In the next embodiment, as shown in FIGS. 9 and 10, the surface of a piece 16 provided on a grinding wheel correction arm 7 is measured by i++ measuring instruments Gl and G2. The position of the piece 16 is arranged at a position i where it is ground by the corrected grindstone surface 9L corrected by the grindstone correction tool 5 during grindstone correction. Therefore, the piece 16 is disposed at the rear of the grindstone correction tool 5 with respect to the moving direction of the grindstone correction arm 7 when cutting is performed. In this case, the cutting at the time of correction is performed only on one side of the swing of the grindstone correction arm 7. And in this example, arm 7
A piece 16 is fitted into a through hole 19 of the arm 7 parallel to the root axis 6 of the arm 7, and a set screw 20 is screwed into a female thread provided from the tip of the arm 7 toward the through hole 19.

During grinding wheel correction, the diamonds of the grinding wheel correction tool are scattered on the grinding wheel surface between the geometric surface drawn by the tip of the grinding wheel correction tool and the grinding wheel surface after grinding wheel correction due to the movement of the grinding wheel surface due to the movement of the grinding wheel correction tool and the grinding wheel. There is a probability that the abrasive grains will be removed, and there is a slight difference. In this embodiment, during the grindstone correction, the piece 16 ground by the corrected grindstone surface is measured, so the conditions are similar to those when grinding the workpiece W, and more accurate tool wear correction for grindstone correction can be expected. Therefore, it is desirable that the material of the piece 16 be made to match the material of the workpiece W.

The piece 16 acts as shown in FIG. 11, and the surface 16S ground by the grinding wheel surface 9L during the last grinding wheel correction process is measured by a measuring device.

[Effect of the Invention 1] Since each invention of the present invention is as described above, after the grindstone is corrected, the grindstone surface is restored to the position of the constant grinding dimension X. Therefore, variations in accuracy are extremely small, and the workpiece dimensions after the grindstone correction can be made highly accurate.

[Brief explanation of the drawing]

Figure 1 (A), Figure 1 (B), Figure 1 (C), Figure 1 (
D), Figure 1 fE) are plan views of the embodiment of the present invention, Figure 2 (A), Figure 2 (B), Section 2 (C), Figure 2 (D),
Fig. 2 (El is a plan view of another embodiment of the present invention, Fig. 3 is a rear view of a double-headed grinder used in C), and Fig. 4 is a view taken along the line A-A in Fig. 3. , Fig. 5 (Al, (Bl,
(C1, (Dl, (El is a schematic diagram showing the method of grinding wheel correction for a double-headed grinder, Fig. 6 (A), CB+, f
cl. (Di, fEl is a schematic diagram showing the neck point during the grinding wheel correction method of a double-headed grinder, Fig. 7 is a back view of a double-headed grinding machine performing the conventional grinding wheel correction method, and Fig. 8 is a diagram showing the neck point of the grinding wheel correction method of a double-headed grinder. B-B
The arrow views and FIGS. 9 to 11 show other embodiments,
FIG. 9 is a side view of the grindstone correction arm, FIG. 10 is a sectional view taken along line CC in FIG. 9, and FIG. 11 is an enlarged view taken along arrow D in FIG. 9 showing the operation. W... Workpiece Gl, G2... Measuring device 1... Bed
2. Whetstone 3. Whetstone stand 4. Whetstone correction device t5.
・Whetstone correction tool 6-・Rotary shaft 7・・Arm 8・
・Belt device 9゜9L・・Whetstone surface 10・・Electric motor
11...Feed motor 12...Screw feed device 13...
Correction action part 14...Control device 15...Center line 16.
- Piece 17... Grinding wheel shaft 19... Through hole 20... Set screw Wl, W2... Amount of wear. Patent Applicant Nippei Toyamayo Co., Ltd. Rihito Arai Part 11 Figure 1 CD) Figure 1 (E) Figure 2 Figure 2 (D) Figure 5 (A) Figure 6 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. Retract the grindstone that is in the grinding position for grinding the workpiece, move it to the grindstone correction position where the grindstone surface is corrected by a correction tool, and correct the grindstone surface by the grindstone correction device, A grindstone correction method in which the grindstone is advanced to a grinding position after the grindstone correction, and the grindstone is stopped at the grinding position to perform grinding, the grindstone correction method comprising a measuring device for measuring the position of a correction action part of a correction tool of the grindstone correction device; Before and after the grindstone surface is corrected by the device, the position of the correction action part of each correction tool of the grindstone correction device is measured by the measuring device, and the difference in the position of the correction action part of each correction tool is determined, The advancing position of the grinding wheel to the grinding position after the grinding wheel correction is moved forward from the grinding position where the grinding wheel was located before the grinding wheel correction by correcting the difference in the position of the correction action part of the correction tool before and after the grinding wheel correction. A method for repairing the grinding wheel of a double-headed grinder. 2. The amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel is calculated by calculating the difference in the position of the correction action part of each correction tool from the amount of movement of the grinding wheel to the grinding position after correction of the previous grindstone. 2. The method for correcting a grinding wheel for a double-headed grinder according to claim 1, wherein the corrected value is used. 3. Retract the grindstone in the grinding position for grinding the workpiece to the position of the correction action part of the correction tool, and advance the grindstone by applying a correction cutting feed so that the grindstone surface is corrected by the correction tool; In a grindstone correction method in which a grindstone surface is corrected by a grindstone correction device, the grindstone is advanced to a grinding position after the grindstone correction, and the grindstone is stopped at the grinding position to perform grinding, the correction action part of the correction tool of the grindstone correction device is Equipped with a measuring device that measures the position, when the grinding wheel is being corrected, the grinding wheel in the grinding position is moved back by the distance it was moved to the grinding position after the grinding wheel was corrected during the previous grinding wheel correction, or by an equivalent amount, and the grinding wheel is moved forward by giving a corrected cutting feed. The position of the correction action part of each correction tool of the grindstone correction device is measured by the measuring instrument before and after the grindstone surface is corrected by the grindstone correction device, and the position of the correction action part of each correction tool is determined. Calculate the difference, and calculate the amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel from the amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel at the time of the previous correction of the grinding wheel, and the position of the correction action part of the correction tool before and after the correction of the grinding wheel. A method for correcting a grinding wheel for a double-headed grinder, characterized in that the differences between the two are corrected values. 4. Retract the grindstone at the grinding position where the workpiece is to be ground, move it to the grindstone correction position where the grindstone surface is corrected by the correction tool, correct the grindstone surface with the grindstone correction device, and after the grindstone correction, grind the grindstone. In a grindstone correction method in which grinding is performed by advancing the grindstone to a grinding position and stopping the grindstone at the grinding position, during the grindstone correction, a piece to be ground by the grindstone surface corrected by the grindstone correction tool is attached to the grindstone correction tool, and the piece is A measuring device for measuring the position is provided, and the position of the piece attached to the grinding wheel correction device is measured by the measuring device before and after the grinding wheel surface is corrected by the grinding wheel correction device, and the difference between the positions of the pieces is determined, and the grinding wheel is corrected. The grinding wheel is moved forward to the grinding position after correcting the difference in the position of the piece attached to the correction tool before and after the grinding wheel correction, and the grinding wheel is moved forward from the grinding position where the grinding wheel was located before the grinding wheel correction. How to repair the grinding wheel of a double-headed grinder. 5. The amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel is the value corrected for the difference in the positions of the pieces attached to the grinding wheel correction device, compared to the amount of movement of the grinding wheel to the grinding position after correction of the grinding wheel at the time of the previous correction of the grinding wheel. The method for repairing a grinding wheel for a double-headed grinder according to claim 4. 6. Retract the grindstone in the grinding position for grinding the workpiece to the position of the correction action part of the correction tool, and advance the grindstone by applying a correction cutting feed so that the grindstone surface is corrected by the correction tool; In a grindstone correction method in which the grindstone surface is corrected by a grindstone correction device, the grindstone is advanced to a grinding position after the grindstone correction, and the grindstone is stopped at the grinding position to perform grinding, during the grindstone correction,
A piece to be ground by the grinding wheel surface corrected by the grinding wheel correction tool is attached to the grinding wheel correction tool, and a measuring device for measuring the position of the piece is provided, and the grinding wheel in the grinding position at the time of the grinding wheel correction is corrected at the time of the previous grinding wheel correction. The position of the piece attached to the grinding wheel correction device before and after the grinding wheel surface is corrected by the grinding wheel correction device by moving the grinding wheel backward by the amount of movement that was later moved to the grinding position, or by an equivalent amount, giving a corrected cutting feed and moving the grinding wheel forward, and correcting the grinding wheel surface by the grinding wheel correction device. is measured by the measuring device, the difference between the positions of each piece is determined, and the amount of movement of the grinding wheel to the grinding position after the correction of the grinding wheel is determined from the amount of movement of the grinding wheel to the grinding position after the correction of the grinding wheel at the time of the previous correction of the grinding wheel. A method for correcting a grinding wheel for a double-head grinder, characterized in that the difference between the positions of the pieces before and after the grinding wheel correction is taken as a corrected value.