JPH11333717A - Grinding wheel forming device and method for using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a grinding wheel so that the V-shaped tip of the grinding wheel may have linearity and the V-shaped tip may be sharply pointed by combining two sets of forming members so that their front surfaces face opposite directions and they may be arranged perpendicular to the inclined direction of the front surfaces and adjacent to a horizontal bus. SOLUTION: A perpendicular line passing the central position in the thickness direction of a grinding wheel is made to coincide with a common horizontal bus L shared with front surfaces of two sets of inclined forming members 25, 26, the grinding wheel is rotated and relatively reciprocated in the direction of the common horizontal bus L of a grinding wheel dresser device 20 of the grinding wheel, and therefore, the front surfaces of the forming members 25, 26 facing opposite directions alternately grind both corner parts of the grinding wheel. Therefore, the grinding wheel can be so formed that its V-shaped tip may in the central position in the thickness direction of the grinding wheel, the linearity of straight parts of the V shape can be provided, and the V-shaped tip can be so formed as to be sharp pointed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dresser device for shaving a grinding wheel used for grinding a magnetic head of a VTR or the like and shaping the cross-sectional shape into a desired shape, that is, a grinding wheel forming device and the like. It is about its use.

[0002]

2. Description of the Related Art In a magnetic head of a VTR, a sliding area of a sliding surface of a magnetic tape is formed to be relatively large with some margin, and a chip of several μm or less is formed in a peripheral portion of the sliding surface. This did not affect the performance of the magnetic head. However, in recent years, along with demands for higher image quality and longer recording time of VTRs, the size of magnetic heads used in VTRs has been reduced.

[0003] When the magnetic head is miniaturized, the sliding area of the sliding surface of the magnetic tape is also reduced, so that the sliding area of the sliding surface cannot be made larger as before, and the sliding area cannot be increased. Since the moving area is formed to the minimum required size, a chip of several μm or less at the periphery of the sliding surface may damage the magnetic tape and adversely affect its performance. Come.

[0004] For this reason, it is required to form a chipless processing portion (corner chamfered portion) on the shoulder portion on both sides of the sliding surface of the magnetic head, on which the magnetic tape slides.
It has been required to form a chamfered portion using zero or more grindstones.

[0005] For example, as shown in FIG.
A chamfered portion 10a is formed on both shoulders of the front side. To form such a chamfered portion 10a, the front and rear of a circumferential portion of a disk-shaped grinding wheel 12 having a sectional shape as shown in FIG. It can be formed by grinding with the tapered surfaces 12a on both sides.

As such a grinding wheel 12, a metal resinoid wheel, a vitrified wheel, a resinoid wheel or the like is used. The tapered surface 12a of the grinding wheel 12 can be formed as shown in FIG. That is, first, as shown in FIG. 1 (a), the circumferential angle portion on one side of the rotating grinding wheel 12 is ground to the grinding wheel dresser 1.
4 and formed into a tapered shape by shaving.

Next, as shown in FIG. 1B, a circumferential angle portion on the opposite side of the rotating grinding wheel 12 is ground with a grinding wheel dresser 15.
It is formed into a tapered shape by shaving it in contact with. Then, a grinding wheel 12 having a sectional shape as shown in FIG. 3C is completed, and the forming of the grinding wheel 12 is completed.

As the grinding wheel dresser, grinding wheel dressers 14 and 15 having the same surface roughness as the grinding wheel 12 and having inclined surfaces as shown in FIGS. 10 (a) and 10 (b) are used. For example, an electrodeposited diamond, a diamond whetstone plate, or the like is attached to the surface.

[0009]

However, in such a conventional method of forming a grinding wheel, as shown in FIG. 10, the grinding wheel 12 is formed separately on one side thereof. As shown in (c), grinding wheel 1
It is very difficult to form the V-shaped cross section of the circumferential portion 2 such that the front end P of the front end thereof is located at the center of the grinding wheel 12 in the thickness direction.

Instead of such a grinding wheel forming method,
Using a grinding wheel dresser 16 having a V-shaped concave cross section as shown in FIG. 11, the grinding wheel 12 is arranged such that the lowest point Q of the V-shape coincides with the center position of the grinding wheel 12 in the thickness direction. The above-mentioned problem can be solved by molding.

[0011] However, as shown in the enlarged circle of the lowermost point Q in FIG.
It is very difficult to sharpen the wheel sharply, so that only the grinding wheel dresser 16 whose bottom point Q is rounded can be formed. Therefore, such a grinding wheel dresser 16
The tip portion P of the grinding wheel 12 formed by the method described above is also formed in a rounded shape, and it is very difficult to obtain linearity of the V-shaped linear portion of the grinding wheel 12 and to sharpen the tip portion P sharply. There was a problem that was difficult.

In view of the above problems, the present invention can form the grinding wheel so that the V-shaped tip of the grinding wheel is located at the center of the grinding wheel in the thickness direction, and the linearity of the V-shaped linear portion is improved. An object of the present invention is to provide a grinding wheel forming apparatus and a method of using the same, which can be formed and can be formed so that the V-shaped tip thereof is sharply pointed.

[0013]

In order to solve the above-mentioned problems, a forming apparatus for a grinding wheel according to the present invention includes two sets of forming members whose surfaces are inclined at the same angle with respect to a vertical plane. A configuration in which the two sets of forming members are combined so that the surfaces are opposite to each other and are alternately arranged adjacent to each other in a horizontal generatrix direction perpendicular to and horizontal to the inclination direction of the surface. It was done.

According to the grinding wheel forming apparatus having such a configuration, the vertical plane passing through the central position in the thickness direction of the grinding wheel coincides with the common horizontal generating line shared by the surfaces of the two inclined forming members. Then, by rotating the grinding wheel and reciprocating relatively in the direction of the common horizontal generatrix of the grinding wheel forming apparatus, the surfaces of the forming members opposite to each other alternately cut both corners of the grinding wheel. The molding process can be performed.

[0015]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 to 6
FIG. 1 is a diagram referred to for describing a first embodiment of a grinding wheel forming apparatus and a method of using the same according to the present invention.

[0016] As shown in FIG.
0 (a grinding wheel forming apparatus) includes base members 22 and 23 having inclined surfaces having an angle θ of 60 ° with respect to a vertical surface. Formed members 25 and 26 are provided on the inclined surfaces of the base members 22 and 23 by sticking. The forming members 25 and 26 are arranged such that their surfaces are opposite to each other. Forming member 25, 2
Reference numeral 6 denotes, for example, a material having a count of 2000 or more, and an electrodeposition plating diamond, a diamond whetstone plate, or the like is used.

As shown in FIG. 2, the base member 22 has two inclined support portions 22a at both ends.
A forming member 25 is provided on the inclined surface 2a. A horizontal support portion 22b is formed between the inclined support portions 22a at both ends of the base member 22, and the horizontal support portion 22b
A base member 23 is placed on the upper part, and is fastened and fixed by a screw fastening member 28 as shown in FIG.

As shown in FIG. 2, a forming member 26 is provided on the inclined surface of the inclined supporting portion 23a of the base member 23. The horizontal support portion 22b of the base member 22 includes:
Two screw holes 31 to which the screw fastening members 28 are screwed are formed. Two long holes 29 are formed in the horizontal plate portion fastened by the screw fastening member 28 of the base member 23.

Then, as shown in FIG.
The base members 22 and 23 are assembled such that the base members 22 and 23 are alternately arranged adjacent to each other in the direction of the common horizontal generating line L which is perpendicular to and horizontal to the inclination direction of their surfaces. In order for the horizontal bus bar on the surface of the forming member 25 and the horizontal bus bar on the surface of the forming member 26 to share a common horizontal bus L that is completely aligned, the screw member 30 is rotated and the base member 22 is rotated. Slit part 2 formed in
By adjusting so that 2c is enlarged or reduced, the common horizontal bus L can be shared. Therefore, the screw member 30 and the slit portion 22c constitute a generatrix adjusting means.

In the grinding wheel dresser device 20 shown in FIG. 1, when the forming members 25 and 26 share one common horizontal bus L, the horizontal reference dimension a of the common horizontal bus L
And the vertical reference dimension b is such that the screw fastening member 28 is
By moving the base member 23 relative to the base member 22 in the horizontal direction via the reference numeral 9, it is variable. That is, the larger the horizontal reference dimension a becomes and the smaller the vertical reference dimension b becomes, the more the common horizontal bus L moves to the lower side of the forming members 25 and 26. Therefore, the screw fastening member 28 and the elongated hole 29 constitute relative position adjusting means.

Hereinafter, a method of using the grinding wheel dresser device 20 according to the embodiment will be described. First, as shown in FIG. 3, the above-mentioned grindstone dresser device 20 is placed on a support table 34 directly below the grindstone 12 of a grindstone 32 having the grindstone 12, and fixed by magnetic force or the like. The grinding wheel 12 is moved in X, Y, Z directions with respect to the grinding wheel dresser device 20 on the support table 34 by a driving device (not shown).
Relative movement in each axial direction. Grinding wheel 12
For example, a grindstone such as a metal resinoid grindstone, a vitrified grindstone, and a resinoid grindstone having a grindstone number of 2000 or more can be used.

After the radial runout and the thickness runout of the grinding wheel 12 are removed in advance by a dresser for shaking, the grindstone is adjusted so that the common horizontal bus L and the X-axis direction of the grinding device 32 coincide. After the dresser device 20 is fixed on the support table 34, the outer peripheral portion of the grinding wheel 12 is finally formed.

First, as shown in FIG. 4 (a), the grinding wheel 12 is moved to the forming members 25 and 2 of the grinding wheel dresser device 20.
6 above. Next, as shown in FIG. 4B, the rotating grinding wheel 12 is relatively reciprocated in the Y-axis direction, and the corners of the grinding wheel 12 come into contact with each of the forming members 25 and 26. Left and right 2 in the figure of the grinding wheel 12
Find one position.

As shown in FIG. 4 (c), the grinding wheel 1 is located at a central position between the left and right positions of the grinding wheel 12.
After the relative movement of the grinding wheel 2, the grinding wheel 12 is relatively moved downward in the figure until the corners on both sides of the circumferential portion of the grinding wheel 12 contact both the forming members 25 and 26.

Then, from this state, the grinding wheel 12 is relatively moved upward by about 20 μm in the figure, and then the grinding wheel 1 is moved.
2 is relatively moved in the X-axis direction. Then, at first, the grinding wheel 12 does not contact any of the forming members 25, 26, but starts to contact the forming members 25, 26 when the grinding wheel 12 is relatively moved gradually downward in the figure. Then, the grinding wheel 12 relatively moves along the common horizontal generating line L, and the grinding wheel 12
The grinding process is performed by shaving the corners on both sides of the circumferential portion of the grinding wheel 12 alternately.

In this manner, the grinding wheel 12 is relatively moved downwardly in the figure so that the grinding wheel 12 is relatively reciprocated to perform reciprocating and shaping processing, for example, by cutting 1 μm at a time. Eventually, FIG. 4 (d)
As shown in (2), two tapered surfaces 12a can be formed by shaving off the corners on both sides of the circumferential portion of the grinding wheel 12.

By performing the forming process in this manner, it is possible to perform the forming such that the front end portion P where the two tapered surfaces 12a intersect is located exactly at the center position in the thickness direction of the grinding wheel 12. The linearity of the V-shaped straight part can be obtained, and the tip part P of the grinding wheel 12 can be sharpened sharply without becoming round.

Also, the shape of the grinding wheel 12 is confirmed during the forming. If the tip P is not at the center of the grinding wheel 12 in the thickness direction, the grinding wheel 12 is relatively moved in the Y-axis direction. In addition, by cutting and processing, it is possible to correct the tip P to be located at the center position in the thickness direction of the grinding wheel 12.

Therefore, according to the grinding wheel dresser device 20 according to the embodiment, the two surfaces of the two sets of forming members which are inclined and the vertical surface passing through the central position in the thickness direction of the grinding wheel 12 are shared. By making the horizontal bus L coincident with each other, rotating the grinding wheel 12 and reciprocating the grinding wheel 12 relative to each other in the direction of the common horizontal bus L of the grinding wheel dresser device 20, the surfaces of the forming members opposite to each other can be formed. The shaping can be performed by alternately shaving the corners on both sides of the grinding wheel 12. Therefore, the V-shaped tip of the grinding wheel can be formed so as to be located at the center in the thickness direction of the grinding wheel, and the linearity of the V-shaped straight portion can be obtained, and the V-shaped tip can be obtained. Can be formed to be sharp.

Accordingly, grinding of the V-shaped winding groove M of the magnetic head part 35 as shown in FIG. 5 and grinding of the V-shaped track width regulating groove T of the magnetic head part 36 as shown in FIG. Since the formed grinding wheel 12 can be used for the processing, the positioning of the grinding wheel 12 at the time of the grinding process is easy and accurate, and the V-shaped winding groove M and the track width regulating groove T, If the tip is not desired to be rounded, the tip can be sharpened.

The magnetic head components 35 and 36 are ground by removing the grindstone dresser device 20 from the support 34 of the grinding device 32 and then mounting the magnetic head components 35 and 36 on the support 34. Can be fixed and the grinding process can be performed by the grinding wheel 12 just formed by the grinding wheel dresser device 20.

Further, according to the grinding wheel dresser device 20 according to the above embodiment, the forming members 25 and 26 share a common horizontal bus L and the grinding wheel 12 uses the common horizontal bus L
, The grinding wheel 12 can contact the forming members 25 and 26 evenly along the common horizontal generating line L so that the grinding wheels 12 can be uniformly cut. Can be prevented.

Further, according to the grinding wheel dresser device 20 according to the above-described embodiment, the horizontal reference dimension a and the vertical reference dimension b of the common horizontal bus L
By moving the base member 23 in the horizontal direction with respect to the base member 22 via the.

For this reason, the grinding wheel 12 and the formed workpiece 2
5 and 26 can be shifted, so that the grinding wheel 12
Can be performed, the molding speed can be prevented from being lowered and the molded shape can be prevented from deteriorating, and the molded members 25 and 26 can be effectively used over the entire surface.

Further, as compared with the conventional method of forming the grinding wheel 12 on one side side as shown in FIG. 10, the escape of the grinding wheel 12 during forming is reduced. Even in the case of a thin whetstone of 2 mm or less, it can be formed into a V-shape while preventing its escape.

FIG. 7 is a view showing a grinding wheel forming apparatus 40 according to a second embodiment of the present invention. In the first embodiment, the grindstone dresser device 20 has two forming members 25 and one forming member 26. In the second embodiment, however, the forming of a grinding wheel is performed. The difference is that the apparatus 40 has two forming members 25 and two forming members 26.

In this grinding wheel forming apparatus 40,
A slit portion 42c similar to the slit portion 22c in the first embodiment is provided, and the forming member 25 is formed by the screw member 30 in the same manner as in the first embodiment.
The horizontal bus and the horizontal bus of the forming member 26 can be adjusted so that a common horizontal bus L can be shared.

According to the second embodiment, the corners on both sides of the circumferential portion of the grinding wheel 12 are more evenly cut than in the first embodiment, and the shaving is performed quickly. Processing can be performed.

In the above-described embodiment, the description has been given of the grinding wheel dresser device 20 or 40 having two forming members 25 and one or two forming members 26. However, the forming member 25 is provided in the grinding wheel forming device. One or three or more, or three or more forming members 26 can be provided, and the number thereof can be provided in various combinations.

Further, in the above-described embodiment, the case where the object to be ground is the both shoulders of the magnetic head and the parts 35 and 36 thereof has been described. However, the object to be ground is not limited to these. It goes without saying that any other thing may be used.

Further, in the above-described embodiment, the case where the inclination angle between the vertical surface and the forming members 25 and 26 is 60 ° has been described, but the inclination angle may be any angle between 0 and 180 °. It goes without saying that any angle may be used.

Further, in the above-described embodiment, an example in which the forming members 25 and 26 are formed by using an electroplated diamond or a diamond grindstone plate has been described. In the present invention, other materials are used. Is also good.

In the above-described embodiment, the grinding wheel 12 using a metal resinoid grindstone, a vitrified grindstone, a resinoid grindstone, or the like is described as an example. In the present invention, other grindstones are used. Is also good.

Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and may be variously modified based on the technical idea of the present invention. Can be changed.

[0045]

As described above, according to the grinding wheel forming apparatus of the present invention, the V-shaped tip of the grinding wheel can be formed so as to be located at the center of the grinding wheel in the thickness direction. The linearity of the V-shaped straight portion can be obtained, and the V-shaped tip can be formed so as to be sharp.

[Brief description of the drawings]

FIG. 1 is a view showing a grindstone dresser device 20 according to a first embodiment of the present invention, and FIG.
FIG. 1B is a side view thereof.

FIG. 2 is an exploded perspective view of the grinding wheel dresser device 20 in FIG.

FIG. 3 is a perspective view of the periphery of the grinding wheel 12 of the grinding device 32.

4 (a) to 4 (d) show the forming operation of the grinding wheel 12. FIG.
FIG.

5A and 5B are a perspective view of a magnetic head component 35 and an enlarged perspective view of a winding groove M of the magnetic head component 35, showing an example of grinding by the grinding wheel 12;

FIG. 6 is a perspective view of a magnetic head part 36 showing another example of grinding processing by the grinding wheel 12, and its track width regulating groove T.
It is an expansion perspective view of the part.

FIG. 7 is a perspective view of a grinding wheel forming apparatus 40 according to a second embodiment of the present invention.

FIG. 8 is a perspective view of the magnetic head 10 and a partially enlarged view thereof.

FIG. 9 is a sectional view of the grinding wheel 12;

10 is a partial cross-sectional view showing a procedure of a conventional forming method of the grinding wheel 12 in the order of FIGS. 10 (a) to 10 (c). FIG.

11A and 11B are a cross-sectional view and a partially enlarged cross-sectional view of a grindstone dresser 16 used in another conventional method of forming a grindstone 12.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Magnetic head, 10a ... Chamfering part, 12 ... Grinding grindstone, 12a ... Tapered surface, 14, 15, 16 ... Grindstone dresser, 20 ... Grindstone dresser device, 22, 23 ... Base member, 22a, 23a ... Inclined support part, 22b: horizontal support portion, 22c: slit portion, 25, 26: molded member, 28: screw fastening member, 29: long hole, 30: screw member, 31: screw hole, 32: grinding device, 34: support base, 3
5, 36: magnetic head parts, 40: grinding wheel forming device, 42c: slit portion, L: common horizontal busbar, M: winding groove, T: track width regulating groove

Claims (4)

[Claims] 1. Two sets of forming members whose surfaces are inclined at the same angle with respect to a vertical plane are provided, and the surfaces are opposite to each other and are perpendicular to the direction of inclination of the surface. An apparatus for forming a grinding wheel, wherein the two sets of forming members are combined so as to be alternately arranged adjacent to each other in a horizontal horizontal generatrix direction. 2. A common horizontal bus bar in which one of the two sets of forming members is rotated in the horizontal direction and the horizontal generatrix direction of this forming member is connected to the horizontal generatrix direction of the other forming member. 2. The grinding wheel forming apparatus according to claim 1, further comprising a generating means for adjusting so as to be shared. 3. A relative position adjusting means for moving one of the two sets of forming members from the other forming member in a direction perpendicular to the horizontal generatrix and in a horizontal direction. The forming device for a grinding wheel according to item 1. 4. Two sets of forming members whose surfaces are inclined at the same angle to each other with respect to a vertical plane are provided, and the surfaces are opposite to each other and are perpendicular to the direction of inclination of this surface. A vertical plane and an inclined plane passing through the center position in the thickness direction of the grinding wheel, using a grinding wheel forming apparatus in which the two sets of forming members are combined so as to be arranged alternately next to each other in a horizontal horizontal generatrix direction. By aligning the common horizontal generating line shared by the surfaces of the two sets of forming members, rotating the grinding wheel and relatively reciprocating in the common horizontal generating line direction of the grinding wheel forming apparatus, A method of using a grinding wheel forming apparatus, wherein a surface of a forming member in an opposite direction is formed by alternately shaving both corners of a grinding wheel.