JP7431645B2 - Dress grinding device and method - Google Patents

Description

The present invention relates to a dress grinding device for a grinding machine and a control method thereof, and particularly to a dress grinding device for a thread grinding machine and a control method thereof.

Conventionally, in grinding using a grinding machine, especially in ball screw grinding, it has been possible to create gothic-shaped grooves as described in JIS B 1192-1:2018 and grooves derived by slightly correcting the grooves. many. FIG. 1 shows an outline of the shape of the Gothic groove, which is symmetrical, but the centers of the right and left arcs are shifted. Generally, a shape based on this is used, such as adding a chamfer to the edge of the groove or digging deeper in the center of the groove, depending on the requirements. At this time, when grinding a thread groove using a thread grinder, the shape of the grindstone is made to match the shape to be made in the thread groove, and the cross-sectional shape of the grindstone is transferred almost exactly along the spiral to form the desired groove. It is common to create shapes. As a dressing device for creating the shape of this grindstone, devices with various mechanisms are prepared and used in the market. For example, a dressing device and method for a grinding machine equipped with a rotary dresser is used (for example, Patent Document 1 and 2).

Utility Model Publication No. 62-11560 Japanese Patent Application Publication No. 3-55160

Further, as a dressing grinding device for a thread grinding machine, for example, a dressing device as shown in FIG. 2 is also used, and this device shown in FIG. 2 also has a mechanism for rotating a rotary dresser. In general, the shaping of a whetstone is called truing, and the sharpening of a whetstone is called dressing, but here we will also refer to the operation of shaping the whetstone as dressing. In the apparatus shown in FIG. 2, an object for sharpening a grindstone is arranged around the outer periphery of the rotary dresser, and when it hits the grindstone while rotating, the shape of the grindstone changes. Since diamonds are usually used, the disk itself with diamonds arranged around its outer circumference is referred to here as a rotary diamond. The device shown in Figure 2 has linear axes U-axis (parallel to the X-axis) and W-axis (parallel to the Z-axis) that define two-dimensional positions within the When a rotary diamond, which is equivalent to a tool for sharpening a whetstone, is rotated around the B-axis, the amount of offset of the tip of the diamond, which corresponds to the cutting edge, from the B-axis rotation center (as shown in Figure 2) is It has a feed axis or adjustment mechanism for adjusting the B-axis (turning radius). In such a device, a Gothic-shaped circular arc portion can be created by U-W circular interpolation, and can also be formed by determining the U-W coordinates and rotating the B-axis. UW circular interpolation uses 2-axis synchronous control, and B-axis rotation uses 1-axis control, and in general, arc forming using B-axis rotation with a small number of synchronously controlled axes makes it easier to stabilize accuracy. It is not necessarily necessary for either U or W to be parallel to the rotation axis of the grinding wheel, as long as they can be combined to create a parallel movement in the plane, but in the case of the device shown in Figure 2, the dress In each case, the center of the arc is moved forward along the U-axis to match the diameter of the grindstone. In addition, with this device, it is also possible to create a shape using a method generally called normal direction control, which performs circular interpolation using U-W two-axis synchronous control as the radius increases, and directs a specific part of the rotary diamond toward the grindstone using the B axis. It is.

At this time, when the dressing progresses to a certain extent and the shape of the whetstone becomes stable enough, the thin line in Figure 3(b) shows the shape of the whetstone formed by the previous dressing, and the hatched area is scraped off by the current dressing. It becomes an area. Looking at this shape, even if it advances by 1 in the U-axis direction, if we approximate it under the condition that this 1 is small, only cos θy will be removed in the thickness calculation near B = θy (see Figure 4). It turns out. If θy = 60 degrees, it is 0.5. Therefore, although the thinly shaved portion is finished in a neat shape, the sharpening tends to be insufficient and the use of such a whetstone tends to cause grinding burn. On the other hand, if the U-axis is made excessively large in an attempt to thicken the thin portion shown in FIG. 4, an excessive load will be applied to the rotary diamond, which may damage the rotary diamond depending on the type of grindstone.

However, in reality, the position of the diamond tip is often not known on the order of micrometers. For example, due to manufacturing tolerances and assembly deviations of the rotary dresser, thermal deformation of the dressing device, etc., the position may deviate from the designed position on the order of micrometers. This is not a problem if only the U-W interpolation is used to cut the arc, but if the B-axis arc and U-W movement are combined, there may actually be variations in the cutting due to the deviation. There is.

An object of the present invention is to provide dress grinding for a grinding machine that not only allows sufficient sharpening, but also effectively prevents grinding burn and damage to the rotary diamond, and reduces the influence of deviations from the design of the position of the diamond tip. An object of the present invention is to provide a device and a control method thereof.

As a result of intensive research into a dress grinding device for a screw grinding machine and its control method, which not only allows for sufficient sharpening but also effectively prevents grinding burn and damage to the rotary diamond, the present inventor discovered that is the U-axis, the horizontal linear axis perpendicular to the U-axis is the W-axis, and the rotation axis around the linear axis perpendicular to both the U-axis and the W-axis is the B-axis. It was discovered that two-step dressing can be performed using synchronous control or U-B synchronous control, in which rough dressing is performed to the rough dressing target shown by the thick line in Fig. 5 (a), and then finish dressing with a constant cut thickness in (b) is performed. Ta. Of course, if it is not possible to scrape off all the way to the rough dress line in FIG. 5(a) at once, scrape off in multiple steps. Although the thick line rough dressing target in Fig. 5(a) is a line that is strictly calculated by giving a target offset for finishing dressing, it may be approximated by polygonal approximation as appropriate, or It may be simplified such that only the vertices in the negative direction are removed.

Furthermore, it has been found that the following dressing control method is effective in reducing the influence of the deviation of the position of the diamond tip from the design.
First, it is assumed that the target device is equipped with an AE sensor and can send a signal to the control device to notify the contact between the grindstone and the dresser. It is also assumed that the control device that receives the signal has a function generally called a skip function that can temporarily stop the feed and record the coordinates that received the signal.
In the method for controlling the dress grinding device, as a first step, as shown in FIG. 6(a), the UW axis is lowered relative to the grindstone by an amount corresponding to a certain thickness u that is desired for the finishing cut. Then, if the diamond tip is moved along the trajectory on the rough dressing target shown in FIG. 5, the grinding wheel and the diamond tip should come into contact if the diamond tip is moved backward by u in the direction of the B axis. This is confirmed by a skip function using an AE sensor, as shown in FIG. 6(b). In other words, it is temporarily stopped at several points on the trajectory and sent along the UW axis in the direction of the B axis to find the deviation of the plan with respect to u.
Next, as a second step, the rough dressing target command in Fig. 5 is corrected on the UW axis using the deviation with respect to u (the amount of shift according to the angle is converted into a sequence or function), and this correction is performed. 5(a) is replaced with a rough dressing target to which .
In addition, if the deviation is larger than the thickness, as shown in FIG. 6(c), it is sufficient to temporarily lower the thickness uL, which is larger than the desired constant thickness u. At that time, the locus corresponding to the rough dressing target also needs to be adjusted to a larger extent. As before, the deviation from the larger thickness uL is determined using the skip function using the AE sensor and the trajectory is corrected. (The shift amount according to the angle is converted into a numerical sequence or a function.) The rest is executed from the second step described earlier.
However, depending on the size of the deviation and the size of the large thickness uL set above, if you return it by an amount equivalent to the constant thickness u above and then move it on a trajectory on the corrected coarse dress target, it may still result in an inappropriate depth of cut. (Depending on the angle of B, there may be cases where cutting is interrupted or too much cutting is left.) Therefore, the trajectory of the rough dressing target is replaced with the trajectory of the corrected rough dressing target using uL', which is shifted even smaller than the above uL, and the trajectory of the rough dressing target is replaced with the trajectory of the rough dressing target. Repeat the process until no inconvenience occurs.
In this way, in a dressing device like the one shown in Figure 2, ``the parts that are not thinly ground will be finished with a fine shape (surface roughness, gloss, etc.), but the sharpening tends to be insufficient and grinding burns will occur if that grindstone is used. In order to avoid the problem of ``making it more likely to cause problems,'' it is possible to reduce the influence of deviations from the design of the position of the diamond tip.

According to the present invention, dress grinding for a grinding machine allows sufficient sharpening, effectively prevents grinding burn and damage to the rotary diamond, and reduces the influence of deviation from the design of the position of the diamond tip. A device and a control method thereof can be provided.

It is a figure which shows an example of the outline of a Gothic-shaped groove. 1 is a diagram showing the basic configuration of a dress grinding device for a screw grinding machine capable of UWB synchronous control or UWB synchronous control. FIG. (a) is a diagram showing an example of the shape applied to the grindstone, and (b) is a diagram showing an example of the area to be removed by the grindstone in the next dressing. It is a figure for explaining the problem of the conventional dress grinding device for thread grinding machines, and its control method. 1A is a diagram showing a rough dressing target and FIG. 1B is a diagram showing a finishing dressing target in a dressing grinding device for a thread grinding machine and a control method thereof according to an embodiment of the present invention. FIG. FIG. 1 is a first diagram for explaining a dress grinding method for a thread grinding machine according to an embodiment of the present invention. FIG. 2 is a functional block diagram of a control system of a dress grinding device for a thread grinding machine according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structure of the principal part of the dress grinding apparatus for thread grinders based on embodiment of this invention. It is the 2nd figure for explaining the dress grinding method for thread grinders concerning an embodiment of the present invention. It is the 3rd figure for explaining the dress grinding method for thread grinders concerning an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a machine configuration using the dressing grinding method for a thread grinding machine of the present invention, which includes a thread grinding device (main machine) with a built-in CNC and a dressing device (auxiliary machine) with a built-in CNC.

First, in order to facilitate understanding of the present invention, the configuration of a dress grinding device for a screw grinder to which the present invention is applied will be explained in detail with reference to FIG. 2 again. Fig. 2 shows a dress grinding device for a screw grinder, in which the linear axis in the cutting direction is the U axis, the horizontal linear axis perpendicular to the U axis is the W axis, and the linear axis is perpendicular to both the U axis and the W axis. FIG. 2 is a schematic diagram showing the basic configuration of a dress grinding device for a screw grinding machine capable of UWB synchronous control or UB synchronous control when the rotation axis around a linear axis is the B axis. As shown in FIG. 2, a dressing grinding device 100 for a screw grinding machine to which the present invention is applied includes a W (axis) feeding device 102 that can move a rotary dresser (described later) in the W (axis) direction, and a It includes a U (axis) feeding device 104 that is movable in the U (axis) direction, a B-axis rotation device 106 that is similarly rotatable around the B-axis, and a radius adjustment device 108 . A rotary dresser rotation device 110 is attached to the B-axis rotation device 106 and the radius adjustment device 108 so as to be able to rotate the B-axis and adjust the radius of the diamond tip as described later. Further, a rotary dresser 112 is attached to a rotating shaft 110a of this rotary dresser rotating device 110. Diamonds 112A are mounted on the circumferential surface of the rotary dresser 112 so that each section has a triangular pyramid shape or a prismatic shape. The radius adjustment device 108 can be rotated by the B-axis rotation device 106, supports the rotary dresser rotation device 110, and is configured to be able to adjust the radius of the diamond tip 112a when rotated around the B-axis. With such a configuration, the rotary dresser rotating device 110 performs a feeding operation in the W (axis) direction, a feeding operation in the U (axis) direction, a turning operation around the B-axis, and an offset amount (B-axis) of the diamond tip 112a from the B-axis turning center 115. The turning radius) 113 (distance between the B-axis turning center 115 and the diamond tip 112a) is adjusted, and while rotating the rotary dresser 112, the grinding wheel 200 is rotated in synchronization with the grinding wheel 200 to be dressed. The peripheral surface is dressed with the diamond tip 112a. As mentioned above, "dressing" here includes not only "sharpening the whetstone" but also the operation of shaping the shape of the whetstone. In the dress grinding device 100 for a thread grinding machine configured as described above, UWB synchronous control or UWB synchronous control is possible in the UWB axis direction defined in FIG. If so, the grindstone 200 for a screw grinder can be used for dress grinding. Conventionally, in the dressing grinding device 100 having such a configuration, the rotary dresser 112 is rotated so that a locus of the diamond tip 112a can be repeatedly drawn in a constant manner, and the grindstone is dressed by moving this repeated locus in the U-axis direction. The Gothic-shaped groove described above can be formed by doing this.

である。 FIG. 5 is a diagram showing (a) a rough dressing target and (b) a finishing dressing target in the dress grinding device 100 for a thread grinding machine according to the present embodiment. As mentioned above, with the conventional dressing method, the thinly cut parts become insufficiently sharpened, and using such a grinding wheel tends to cause grinding burn. On the other hand, if the U-axis is made too large, it places stress on the rotary diamond. This may cause problems such as costs. Therefore, in the dress grinding device for a thread grinding machine and its method according to the present embodiment, the dress grinding device 100 for a thread grinding machine capable of the above-mentioned UWB synchronous control or U-B synchronous control (see FIG. 2) is used. ), a two-step dressing was performed in which first rough dressing was performed to the rough dressing target shown by the thick line in FIG. That is, what is shown by the bold line in FIG. 5(b) is the finishing dressing target 56. Of course, if the rough dressing target 52 shown by the bold line in FIG. 5(a) cannot be removed at once, the removal is done in multiple steps. Note that the rough dressing target 52 shown by a thick line in FIG. 5(a) is a line that is precisely calculated by giving a target offset for finishing dressing. In other words, if you do not consider the offset in the U-axis direction, you can simply replace R with R+r (r: the thickness you want to cut in for finishing). The shape attached to the grindstone is called the old trajectory, and the trajectory prepared in this way is called the new trajectory. The offset in the U-axis direction is arranged so that the old locus and new locus intersect at the end 54 of the range used for cutting. If there is a feed axis for radius adjustment, this can be achieved just by adjusting that axis, but if it is manual, the offset in the U-W direction is synchronized with the movement of the B axis (the radial outward movement due to B turning) direction). If solved strictly, the shift amount can be obtained by the following formula (1).

It is.

However, in reality, the position of the diamond tip is often not known on the order of micrometers. For example, due to manufacturing tolerances and assembly deviations of the rotary dresser, thermal deformation of the dressing device, etc., the position may deviate from the designed position on the order of micrometers. This is not a problem if only the U-W interpolation is used to cut the arc, but if the B-axis arc and U-W movement are combined, there may actually be variations in the cutting due to the deviation. There is.

Therefore, the inventor of the present invention has developed a method as described below, which not only enables sufficient sharpening but also effectively prevents grinding burn and damage to the rotary diamond, and also reduces the influence of deviation from the design of the position of the diamond tip. Made it possible to reduce it. That is, first, by UW-B synchronous control or U-B synchronous control, rough dressing is performed to the rough dressing target shown by the thick line in FIG. This is a two-step dress. Of course, if it is not possible to scrape off all the way to the rough dress line in FIG. 5(a) at once, scrape off in multiple steps. Although the thick line rough dressing target in Fig. 5(a) is a line that is strictly calculated by giving a target offset for finishing dressing, it may be approximated by polygonal approximation as appropriate, or It may be simplified such that only the vertices in the negative direction are removed.

Furthermore, it has been found that the following dressing control method is effective in reducing the influence of the deviation of the position of the diamond tip from the design. Hereinafter, a method of controlling a dress grinding device for a thread grinding machine according to an embodiment of the present invention will be described with reference to FIGS. 6 to 10. First, it is assumed that the target dressing control device is equipped with an AE sensor and can send a signal to the control device to notify the contact between the grindstone and the dresser. It is also assumed that the control device that receives the signal has a function generally called a skip function that can temporarily stop the feed and record the coordinates that received the signal.

FIG. 6 is a first diagram illustrating a method of controlling a dress grinding device for a thread grinding machine according to an embodiment of the present invention. 6(a) shows the current grinding wheel shape 64 for the same trajectory (UW offset) 62 as the rough dressing target, and in FIG. 6(b), this deviation is confirmed with the skip function and the B-axis at that point is shown. This indicates that UW linear interpolation (up to the skip signal) is performed toward the turning center, that is, the distance to contact is confirmed using the skip function. Moreover, FIG. 6(c) shows a control method in which, when the deviation is larger than the thickness, the thickness uL is temporarily lowered by a value larger than the desired constant thickness u. In this case, it is also necessary to adjust the locus corresponding to the rough dressing target to a larger extent. Similarly to FIG. 6(b), the deviation with respect to the larger thickness uL is determined by the skip function using the AE sensor and the trajectory is corrected. FIG. 7 is a functional block diagram schematically showing a control system of the dress grinding device for a thread grinding machine according to the present embodiment. The dress grinding device 100 for a screw grinding machine according to the present embodiment includes, as a control system, a dress control device 700, an input/output device 710, each shaft motor 720 and each motor drive 730, a rotary diamond shaft rotating motor 740, and a rotary diamond shaft rotating motor 740. It has a diamond shaft motor drive 750. The dress control device 700 includes an axis control section 702, a programmable controller 704, and an I/O (input/output) module 706. The control system of the dress grinding apparatus 100 according to this embodiment also includes various switches and the like as an input/output device 710, as well as an AE sensor, an encoder, etc. related to the skip signal, which is the key point of the present invention. The dressing control device consisting of these control systems may be a separate control device from the screw grinding machine control device (not shown), or may be a part of the screw grinding machine control device (not shown). good.

FIG. 8 is a schematic diagram showing the configuration of main parts of the dress grinding device for a thread grinding machine according to the present embodiment. That is, FIG. 8 shows the correspondence between contact detection by the AE sensor and its signal processing and control. When contact is detected by the AE sensor 802, the contact detection signal is sent to the dress control via the signal processing device 804. transmitted to device 700. Here, the AE sensor may be built into the dressing device 100 (see FIG. 2), or may be built into the device side of a grindstone shaft (not shown) of a screw grinder (not shown). In FIG. 8, the AE sensor is installed on the stationary side, but it is more suitable for this sensor to be of a type that is installed within the rotating shaft so that it can be installed close to the contact point.

FIG. 9 is a second diagram for explaining the dress grinding method for a screw grinder according to the present embodiment. In FIG. 9(a), it is assumed that the deviation (offset) from the same trajectory 62 as the rough dressing target shown in FIG. 6(a) is uniform regardless of the B-axis turning angle position. That is, in FIG. 9(a), the horizontal axis of the graph shows the B-axis turning angle position from 0° to ±75°, and the vertical axis shows the offset amount. However, due to mechanical reasons, the offset amount may actually deviate depending on the B-axis turning angle position, as shown in FIG. 9(b). In contrast, in the dress grinding method for a screw grinding machine according to the present embodiment, this deviation is confirmed by the skip function, and U-W linear interpolation (up to the skip signal) is performed toward the B-axis turning center at that point. By doing this, you will solve this discrepancy problem. FIG. 10 is a third diagram showing the dress grinding method for a screw grinder according to the present embodiment. That is, in the dress grinding method for a screw grinding machine according to the present embodiment, as shown in FIG. 10(a), the actual offset amount due to the machine is measured at each point (here and there), and ), check the deviation at each point using the skip function, perform U-W linear interpolation (up to the skip signal) toward the B-axis turning center at that point, and then correct the trajectory to bring it closer. Do it like this. As a result, as shown in FIG. 10(c), a uniform assumed offset can be obtained regardless of the B-axis turning angle position.

As described above, in the control method of the dress grinding device for a thread grinding machine according to the present embodiment, as shown in FIG. 6(a), the UW axis is finished cut into the grindstone. It is lowered by an amount corresponding to the constant thickness u. Then, if the diamond tip is moved along the trajectory on the rough dressing target shown in FIG. 5, the tip of the diamond should be in the direction of the B axis, and if it is fed by the above-mentioned constant thickness u, the grinding wheel and the tip of the diamond should come into contact. This is confirmed by a skip function using an AE sensor, as shown in FIG. 6(b). That is, it is temporarily stopped at several points on the trajectory and sent along the UW axis in the direction of the B axis to find the deviation from the planned constant thickness u. Next, as a second step, the rough dressing target command in Fig. 5 is corrected on the UW axis using the deviation with respect to u (the amount of shift according to the angle is converted into a sequence or function), and this correction is performed. 5(a) is replaced with a rough dressing target to which . In addition, if the deviation is larger than the thickness, as shown in FIG. 6(c), it is sufficient to temporarily lower the thickness uL, which is larger than the desired constant thickness u. At that time, the locus corresponding to the rough dressing target also needs to be adjusted to a larger extent. As before, use the skip function using the AE sensor to find the deviation from uL and correct the trajectory. (The amount of shift according to the angle is converted into a numerical sequence or a function.) The rest is executed from the second step described earlier.

However, depending on the size of the deviation and the size of the large uL set, if you return it by an amount corresponding to the same constant thickness u as before and then move it on a trajectory on the corrected coarse dress target, the cut may still be inappropriate. (Depending on the angle of B, there may be cases where cutting is interrupted or too much cutting is left.) Therefore, the first step above is performed by replacing the trajectory of the rough dressing target with the trajectory of the corrected coarse dressing target using a shift uL' that is even smaller than uL. Repeat this operation until the inconvenience no longer occurs. In this way, in a dressing device like the one shown in Figure 2, ``the parts that are not thinly ground will be finished with a fine shape (surface roughness, gloss, etc.), but the sharpening tends to be insufficient and grinding burns will occur if that grindstone is used. In order to avoid the problem of ``making it more likely to cause problems,'' it is possible to reduce the influence of deviations from the design of the position of the diamond tip.

According to an embodiment of the present invention, a grinding machine that not only allows sufficient sharpening, but also can effectively prevent grinding burn and damage to the rotary diamond, as well as reduce the influence of deviation from the design of the position of the diamond tip. A dress grinding device and a control method thereof can be provided.

In the above, the dressing device may be controlled by a separate controller, or may be controlled by a controller in the thread grinding machine itself. That is, the example shown in FIG. 11 includes a thread grinding device (main machine) 110 with a built-in CNC and a dressing device (auxiliary machine) 120 with a built-in CNC.
A thread grinding device (main machine) 110 with a built-in CNC includes a controller 112, a plurality of single-axis drives 114, each motor (actuator) 115, a grindstone shaft drive 116 and its motor (actuator) 117, and an input/output device 118. (position sensor, speed sensor, switch, lamp, touch probe, keyboard...). Here, the controller 112 includes an NC controller 112a, a display and input/output device controller 112b, and an auxiliary (sequence) controller 112c.
The CNC built-in dressing device (auxiliary device) 120 includes a controller 122, a plurality of single-axis drives 124, each motor (actuator) 125, a diamond drive 126 and its motor (actuator) 127, and an input/output device 128. have. Here, the controller 122 includes an NC controller 122a and an auxiliary controller 122c.
Some of the above-mentioned single-axis drives can drive motors for multiple axes. In many cases, the drive is not directly controlled by the NC controller, but is operated by an auxiliary controller. In many cases, controllers such as NC controllers, auxiliary controllers, and displays are integrated into one unit, and some or all of their functions are implemented as software. In other words, it is easy to combine multiple controllers into one controller. Therefore, the controller of the dressing device can be the same as the controller of the main machine, and can be implemented as software on the main machine side. Naturally, in that case, the boundaries between the main engine and the auxiliary engine are not clear.

52 Rough dressing target, 54 End of range used for cutting, 56 Finish dressing target, 62 Same locus as rough dressing target (U-W offset), 64 Current grinding wheel shape, 100 Dressing grinding device for screw grinding machine, 102 W (axis) feeder, 104 U (axis) feeder, 106 B-axis rotation device, 108 radius adjustment device, 110 rotary dresser rotation device, 110a rotating shaft, 112 rotary dresser, 112A diamond, 112a diamond tip, 115 B-axis rotation Center, 113 Offset amount (B axis turning radius), 200 Grinding wheel,

Claims (1)

In a dress grinding device for a screw grinder, the linear axis in the cutting direction is the U axis, the horizontal linear axis perpendicular to the U axis is the W axis, and the linear axis around the linear axis perpendicular to both the U axis and the W axis is When the rotation axis is the B axis,
This is a dress grinding device for a thread grinding machine that is capable of U-W-B synchronous control or U-B synchronous control, and is equipped with an AE sensor to send a signal to the control device to notify when the grinding wheel and dresser come into contact. At the same time, the control device that receives the signal has a skip function that can temporarily stop feeding and record the coordinates that received the signal. It has a dressing means and a finishing dressing means for performing finishing dressing with a constant cut thickness after the rough dressing, and lowers the U-W axis to the grindstone by an amount corresponding to the constant thickness u desired to make the finishing cut, and then The first step is to use the skip function using the AE sensor to confirm that if the diamond tip is moved along the target locus of the rough dressing, the grinding wheel and the diamond tip will come into contact if the diamond tip is moved backward by u in the direction of the B axis. The process of
A dressing for a screw grinding machine, comprising a second step of correcting the rough dressing target command U-W using the deviation with respect to u, and replacing it with the rough dressing target to which this correction is applied. Control method for grinding equipment.

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