JPH03188B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is used to correct the sidewall runout, thickness, etc. of a superabrasive grinding wheel that performs ultra-precision cutting and grooving. The present invention relates to a suitable grinding wheel mold correction method.

[Prior Art] Generally, as shown in FIG. 3, when comb-shaped grooving is performed on a workpiece W or when cutting the workpiece into many strips, resinoid is attached to the rotating shaft 1. Grinding wheel 2 consisting of a bonded diamond grinding wheel, etc.
A grinding wheel (super abrasive grinding wheel) 5 is used, which is constructed by assembling the grinding wheels in parallel with spacers 3 in between and further tightening and fixing them with a tightening nut 4.

By the way, in general, among such grinding wheels 5,
For example, when using the grinding wheel 5 for grooving of magnetic head materials such as ferrite, which requires a processing width of 1 mm or less and a high precision of 10 μm or less relative to the standard dimension, it is necessary to It is particularly important to set the pitch interval P of the grinding wheels 2 within a pre-required machining width dimension accuracy.

For this reason, when setting the pitch interval P of the grinding wheel 5, which conventionally requires a small machining width dimension and high accuracy, first, the grinding wheel 2...
Before assembling the grinding wheels 2..., grind them with a wrapping machine etc. to adjust their thickness and outer circumference runout, then assemble them into the rotating shaft 1 and perform trial machining, and then measure the machining dimensions. The above-mentioned grindstone 2... is disassembled again based on the above-mentioned spacer 3.
This was done by so-called type modification, such as modifying the thickness of...

[Problems to be Solved by the Invention] However, in the above-described conventional method for correcting the shape of the grinding wheel 5, the grinding wheel 2 using the wrapping machine...
The polishing of the spacers 3 and the adjustment of the thickness of the spacers 3 . . . are both operations that require a high level of skill and also require a large amount of working time, resulting in a drawback of inefficiency. Moreover, when reassembling the grinding wheel 2 after adjusting the thickness of the spacer 3, restoration errors due to tightening, etc. are unavoidable, resulting in high precision of approximately ±5 μm or less with respect to the standard machining width dimension. There was a problem that it was difficult to obtain a pitch interval P of . In addition, for example during cutting,
Even when it is necessary to correct only one grindstone 2, all the grindstones 2 must be removed from the rotating shaft 1, which is a contributing factor to the inefficiency of the work. In order to avoid this problem, a technique as shown in Japanese Patent Publication No. 48-44914 has been proposed.

This involves protruding a holding plate between the surfaces of the grinding wheel that is the object of mold correction, placing a diamond tool on both sides of the tip of this holding plate, and moving the holding plate in the radial direction of the grinding wheel while rotating the grinding wheel. This is used to dress the grindstone.

However, in such technology, the diamond tool is brought into contact with the grindstone in spots,
Since dressing is performed by scanning the grindstone surface, it is inevitable that linear traces remain on the dressing surface. To deal with this problem, it is sufficient to arrange a plurality of plate-shaped mold correction whetstones, but when the distance between the grinding wheels is small, forming a thin mold correction whetstone that fits into the gap is difficult. It was difficult to do so using conventional methods.

[Purpose of the Invention] This invention has been made in view of the above-mentioned circumstances, and is intended to correct the sidewall runout, thickness, etc. of a superabrasive grinding wheel such as a resinoid bond diamond grinding wheel that performs ultra-precise cutting and grooving. It is an object of the present invention to provide a method for modifying the shape of a grinding wheel, which can be performed easily, reliably, and with high accuracy without removing the grinding wheel from the rotating shaft.

[Means for Solving the Problems] The grinding wheel mold correction method of the present invention forms a thin plate-shaped mold correction grinding wheel using an electroformed grindstone in which superabrasive grains are dispersed in a metal plating layer. At the same time, these thin plate-shaped mold correction grinding wheels are fixed on a base at intervals corresponding to the pitch spacing, and the superabrasive grinding wheel is rotated between these mold correction grinding stones around the rotation axis. By passing it while rotating and bringing the mold correction grinding wheel surface into contact with the superabrasive grinding wheel surface,
The surface of the superabrasive grinding wheel is ground with the mold correction grindstone to correct the mold.

[Embodiment] Fig. 1 shows a mold correction device used to carry out the first embodiment of the grinding wheel mold correction method of the present invention, and reference numeral 10 in the figure shows a mold correction device of this mold correction device. It is a grindstone for use.

This grinding wheel 10 for mold correction is made by electroplating a substrate (not shown) to eutectoid metals such as nickel, cobalt, and nickel-cobalt with superabrasive grains such as diamond and CBN, and to properly form the grinding wheel 2 to be corrected. After obtaining a grinding wheel layer with a thickness equal to the pitch interval P,
Furthermore, the electroformed grindstone obtained by removing the above-mentioned substrate is further cut into rectangular thin plate shapes.

A plurality of these mold correction grindstones 10...
They are fixed at a predetermined location on the base 12 with their respective side surfaces 10a facing each other in parallel and with a gap gauge 11 having the same thickness as the appropriate thickness of the grindstone 2 interposed therebetween.

Next, an example of a grinding wheel mold correction method according to the present invention using the mold correction device configured as described above will be explained.

First, the base 12 to which the mold correction grindstones 10 are fixed is fixed at a predetermined position on a table (not shown). On the other hand, in the grinding wheel 5 to be corrected, the grinding wheel 2 is placed on the outer periphery of the rotating shaft 1 in advance with a spacer 3.
... in between, and then tighten the nut 4.
Fix it with. Then, while rotating the assembled grinding wheel 5 around the rotating shaft 1, the grinding wheels 2 are passed between the side surfaces 10a of the mold correction grinding wheels 10 of the mold correction device. Then, among the grinding wheels 2 of the grinding wheel 5, if the thickness or side runout is too large, the side surface of the grinding wheel 2...
Grindstone 10 for mold correction fixed at the relevant location on the top
..., and thereby the pitch distance P of the grinding wheels 2... of the grinding wheel 5 is corrected to a required predetermined dimension.

However, in such a method for correcting the shape of a grinding wheel, the grinding wheel 10 for correcting the shape of the grinding wheel 2 of the grinding wheel 5 has a small thickness and a high accuracy of approximately ±3 μm. Since the electroformed grinding wheel has multiple layers of abrasive grains and has excellent rigidity, even if the grinding wheel 5 has a small pitch interval between the grinding wheels 2, the grinding wheels 2 can be attached to the rotating shaft 1. It can be easily and reliably corrected in the same state. The mold correction grindstone 10... enters between the grindstones 2... and sharpens the surface with the pitch of the grindstone 2... fixed, but if the pitch of the grindstone 2... is small and the pattern correction grindstone 10... is thin. However, since the electroformed whetstone is elastic and has high toughness, when it is pressed by the whetstone 2, it undergoes a slight elastic deformation and the whetstone 2...
The surface of the mold can be stably ground to make it flat and the distance between the surfaces constant, allowing mold correction to be carried out. In addition, since the mold correction grinding wheels 10 are fixed to the base 12 and the grinding wheels 5 are passed between them while rotating, there is no risk of the mold correction grinding wheels 10 being shaken. Furthermore, since these mold correction grindstones 10 have a long service life, the mold correction described above can be performed with high accuracy over a long period of time.

[Other Embodiments] FIG. 2 shows a mold correction device used to carry out a second embodiment of the mold correction method of the present invention, in which the pitch intervals of the grinding wheels 2 are as shown in FIG. 1 above. This is for modifying the shape of the grinding wheel 5 which is wider than the one shown.

In FIG. 2, in the mold correction device of this example, a plurality of mold correction grinding wheels 20 are provided in order to simultaneously perform mold correction on the side surface and on the outer peripheral surface of the grinding wheels 2 of the grinding wheel 5. Each set of three sheets is fixed on the base 25. That is,
In FIG. 2, a pair of mold correction whetstones 20a, 20a having substantially the same shape sandwich a mold correction whetstone 20b, which is shorter in length, between them, and the side surfaces 20a, 20a of each other have a shorter length.
c and 20c are fixed apart from each other by an appropriate plate thickness interval of the grindstone 2 to be corrected. Here, the length dimension of the mold correction grindstone 20b is such that the position of the end surface exposed between the mold correction grindstones 20a, 20a is the outer peripheral surface of the grindstone 2 that is passed between the pattern correction grindstones 20a, 20a. 2a is an appropriate passing position. Then, a plurality of sets of these mold correction grindstones 20a, 20a, 20b
are fixed in parallel with each other at the pitch interval of the grindstone 2, with a gap gauge 21 sandwiched between them.

In this case, the thickness of the mold correction grindstone 20 is difficult to specify depending on the hardness of the grindstone to be corrected, but it is set at 0.1 mm to 1.0 mm based on the rigidity of this type of pattern correction grindstone. is desirable. In other words, if the thickness is less than 0.1 mm, sufficient rigidity cannot be obtained and it is unsuitable, and if the thickness exceeds 1.0 mm, it will take a long time to manufacture. This is because it becomes uneconomical.

In the mold correction method using this mold correction device, while rotating the grinding wheel in which the grindstone 2... has been installed in advance, the grindstone 2... is used as the mold correction grindstone 20.
By passing between the side surfaces 20c, 20c of the grindstone 20a, the side surfaces 20c, 20c are used to sharpen the side surface of the grindstone 2, and the pitch interval P thereof is corrected.

At the same time, the outer circumferential surface 2a of the grindstone 2 is ground by the mold correction grindstone 20b between the mold correction grindstones 20a, 20a, and the outer diameter of the grindstone 2 is corrected to an appropriate outer diameter.

Therefore, according to the mold correction method of this example, even when performing mold correction of the grinding wheel 5 in which the pitches of the grinding wheels 2 are wide, the same effects as those shown in the first example can be obtained. In addition, in the method of this example, the mold correction grindstones 20a, 20a
A mold correction grindstone 2 for correction of the outer circumferential surface 2a of the grindstone 2 is provided in between.
0b, it is possible to correct the runout of the outer circumferential surface 2a at the same time as correcting the pitch interval, and thus high work efficiency can be obtained.

Note that in the method for correcting the shape of a grinding wheel shown in the first embodiment, a type correction grindstone for correcting the outer circumferential surface of the grindstone 2 is not used between the type correction grindstones 10. However, the present invention is not limited to this, and if necessary, a mold correction grindstone for correcting the outer circumferential surface may be provided in place of the gap gauge 11.

In addition, in the above embodiments, the grindstone 2
Although the case has been described in which the mold of the superabrasive grinding wheel 5 is corrected in which the distance between the opposing surfaces is the pitch interval P corresponding to the processing width dimension, the embodiment of the present application is not limited to this. As shown in the figure, the present invention can be similarly applied to the shape correction of a grinding wheel in which the distance between the surfaces 2a on one side of each grinding wheel 2 is the pitch interval described above.

In this case, the mold correction grindstones 30 may be fixed to the base 31 so that the distance between the side surfaces 30a is the pitch interval described above.

In addition, the super abrasive grinding wheel 5... is used as the mold correction grinding wheel 10.
The method of passing between the grinding wheels 5..., 20... is arbitrary, but in the case shown in FIGS. 1 and 2, linear movement is sufficient as usual, and the grinding wheel 5... shown in FIG.
A mold correction device may be placed in place of the workpiece W on a processing table (not shown) used when grooving the workpiece W, and the same procedure as in the grooving work may be performed.

In the mold correction work, the mold correction grindstones 10, 2
0, wear progresses more on the inlet side, but if a certain length is secured in the passing direction, an unworn part will remain on the outlet side, and the surface of the whetstone will be finished by that part. , you can make accurate corrections.

On the other hand, in the case of the embodiment shown in FIG. 4, the method described above may be used, but the grinding wheels 5 are moved to the base 31 without making contact with the grinding wheels 30 for mold correction.
The surface 2a of the grindstone 2 may be pressed against the surface of the mold correction grindstone 30 by moving the grinding wheel 5 parallel to its rotation axis.

Further, the shape of the mold correction grinding wheels 10 and 20 used is not limited to rectangular shapes, but may be circular, triangular, or any other shape depending on the feed speed of the grinding wheel 5.

[Experiment Example 1] First, nickel and diamond abrasive grains (abrasive grain diameter 20/30 μm) were electroplated onto the substrate in a plating bath.
A plating layer with a thickness of 0.35 mm was obtained by eutectoid deposition. Next, the substrate was removed to create an electroformed grindstone with a thickness of 0.35 mm. Then, these electroformed grindstones were cut to obtain a rectangular thin plate shaped grindstone for mold correction measuring 20×20×0.35 mm. At this time, the thickness error of the mold correction grindstone was within ±3 μm. Next, a plurality of these grindstones for pattern correction were combined and fixed to a base to create a pattern correction device for a grinding wheel as shown in FIG. 2.

On the other hand, the grinding wheel used for correction is a disc-shaped one with a diameter of 150 mm and a thickness within the range of 0.35 mm to 0.36 mm.
A grinding wheel made of resinoid bond with an abrasive layer containing CBN#600 with a concentration of 100 is installed at a pitch interval of 0.8 mm.
I prepared one with a total of 5 pieces installed. Then, when this grinding wheel was rotated at a circumferential speed of 1800 m and correction was performed at a feed rate of 50 mm/min, the pitch interval was 0.8 mm ± 5 μm, the blade thickness was 0.35 mm ± 3 μm, the outer circumference runout was 2 μm, and the outer diameter was We were able to obtain a grinding wheel with a diameter of 75.0mm±5μm. Incidentally, the cut of the mold correction whetstone in this mold correction was 2 μm/time, and this mold correction whetstone could be used a total of 10,000 times.

[Effects of the Invention] As explained above, the grinding wheel mold correction method of the present invention forms a thin plate-shaped mold correction grinding wheel using an electroformed grindstone in which superabrasive grains are dispersed in a metal plating layer. At the same time, these thin plate-shaped mold correction grinding wheels are fixed on a base at intervals corresponding to the pitch spacing, and a superabrasive grinding wheel is rotated around the rotation axis between these mold correction grinding stones. The surface of the super-abrasive grinding wheel is ground by the above-mentioned pattern correction grindstone, and the pattern is corrected by allowing the surface of the super-abrasive grinding wheel to come into contact with the surface of the super-abrasive grinding wheel.
Therefore, according to this mold correction method, the following effects can be obtained.

(i) This is a grinding wheel made from a super-abrasive grinding wheel, which was conventionally thought to be impossible to correct on the machine. Even if the grinding wheel is narrow and the thickness of each grinding wheel is as thin as 0.3 mm, by forming a thin mold correction grinding wheel that can fit into this gap from an electroformed grinding wheel containing super abrasive grains. Since the mold correction grindstone is elastically deformable and has high rigidity and toughness, it is possible to simultaneously correct the grindstone surface and the spacing between the grindstone surfaces with high precision and without removing it from the rotating shaft.

(ii) By setting the depth of cut to a minute value, for example 2 μm, precise mold correction on the micron order of the superabrasive grinding wheel is possible.

(iii) Because the electroformed grindstone has high wear resistance and homogeneity,
The mold correction grindstone itself has little deformation and is highly durable.

(iv) When grooving a workpiece using a grinding wheel, the mold can be corrected by placing a mold correction device in place of the workpiece on a processing table, etc., and performing the same procedure as for grooving. There is the advantage that no separate equipment for correction is required.

(v) If a smaller diameter grindstone is used as a spacer inserted between the grindstones, it is possible to correct the shape of the outer peripheral surface at the same time as the side surface of the grindstone.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a mold correction device for implementing an embodiment of the grinding wheel mold correction method of the present invention, and FIG. 2 is a mold correction device for implementing a second embodiment of the present invention. FIG. 3 is a schematic configuration diagram showing a mold correction device for carrying out a conventional mold correction method, and FIG. 4 is a schematic configuration diagram showing a method for carrying out a third embodiment of the present invention. It is. 1... Rotating shaft, 2... Grindstone, 2a... Outer peripheral surface,
5... Grinding wheel, 10, 20, 20a, 20b...
Grindstone for mold correction, 11, 21... Feeler gauge, 1
2,25...base.

Claims (1)

[Scope of Claims] 1. The surface of the above-mentioned grinding wheels of a super-abrasive grinding wheel in which a plurality of grinding wheels having super-abrasive grains are mounted on the outer periphery of a rotating shaft with pitch intervals corresponding to the machining width dimension of the workpiece. In the method for correcting the shape of a grinding wheel, the grinding wheel is formed into a thin plate shape using an electroformed grindstone with super abrasive grains dispersed in a metal plating layer, and the thin plate shape is The mold correction grinding wheels are fixed on a base at intervals corresponding to the pitch spacing, and the superabrasive grinding wheel is passed between these mold correction grinding wheels while rotating around the rotation axis. A grinding wheel characterized in that the shape of the super-abrasive grinding wheel is corrected by grinding the surface of the grinding wheel with the pattern-correcting grindstone by bringing the surface of the super-abrasive grinding wheel into contact with the surface of the super-abrasive grinding wheel. How to modify car model.