JPH09267249A - Electroformed grinding wheel and fine grinding method therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electroformed grinding wheel and a fine grinding method therewith, which are made so as to carry out a C chanfering of ferrite subjected to tracking work in a highly accurate manner at all times without entailing any damage to an adjacent projection. SOLUTION: This is an electroformed grinding wheel 1 in use on the fine grinding of a C chamfer or the like of ferrite 7 subjected to tracking work, and it is composed of a disklike wheel base 2 and an cylindrical electroformed abrasive wheel 3 being formed on an outer boundary of this wheel base 2 and projected in the same direction as a turning shaft center. Edge thickness of this electroformed abrasive wheel 3 is 0.05mm to 0.2mm and projection value is 0.05mm to 2mm. The electroformed grinding wheel 1 attached to a rotating spring 4 is rotated at a high speed, through which grinding is carried out so as to make the wheel 1 and a workpiece be relatively moved in a direction orthogonal with the turning shaft center and simultaneously to make the abrasive wheel 3 so as to completely pass through the workpiece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroformed grinding wheel and a fine grinding method using the same.

[0002]

2. Description of the Related Art As shown in FIG. 6, a ferrite A having a track processed B is chamfered with a lateral width of about 0.08 mm and an inclination of 45 ° on both sides of the upper surface of each projection for use in a video reading head or the like. C processing (C chamfering) is performed. Conventionally, a ring-shaped grinding wheel D as shown in FIG. 5 (a) is used for the chamfering process, and the grinding wheel D is attached to the tip of the spindle 4 shown in FIG. The part E is ground and chamfered.

[0003]

According to the conventional C chamfering process, as shown in FIG. 5B, when the grindstone portion E of the grinding wheel D is worn, the edge portion becomes R-shaped, resulting in poor flatness. There was a drawback that the precision was poor because the ferrite A was transferred to the chamfered C portion. Further, if the grinding is performed by using the flat side portion of the grinding wheel D, the lowering of the grinding wheel D may damage adjacent protrusions.
The present invention has been made in order to eliminate such a conventional defect, and is capable of always performing C chamfering of track-processed ferrite with high accuracy without damaging adjacent protrusions, and An object is to provide a fine grinding method using the same.

[0004]

As a means for technically solving the above-mentioned problems, the present invention is an electroformed grinding wheel used for fine grinding such as C chamfering of track-processed ferrite, which is a disk. The gist of an electroformed grinding wheel is composed of a circular wheel base and a cylindrical electroformed grinding blade formed on the outer periphery of the wheel base and protruding in the same direction as the rotation axis. The thickness of the electroformed grinding blade is 0.0
5 mm to 0.2 mm, the protrusion amount is 0.5 mm to 2 m
The summary is m. Further, in the method of performing fine grinding using the electroformed grinding wheel, the electroformed grinding wheel mounted on the rotary spindle is rotated at high speed, and the electroformed grinding wheel and the object to be ground are relatively rotated. The gist is a fine grinding method in which the grinding blade is moved in an orthogonal direction and grinding is performed so that the grinding blade completely passes through the portion to be ground.

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes an electroformed grinding wheel according to the present invention, which has a nut gripping portion 2 at its center.
It is composed of a disk-shaped aluminum wheel base 2 having a and a thin cylindrical electroformed grinding blade 3 formed on the outer periphery of the wheel base 2 so as to project by a predetermined amount in the same direction as the rotation axis thereof. ing. The electroformed grinding blade 3 has a blade thickness of 0.0, for example.
The thickness is 5 mm to 0.2 mm, and the protrusion amount is about 0.5 mm to 2 mm.

In this electroformed grinding wheel 1, the nut gripping portion 2a is fitted to the mounting portion 5 formed at the tip of the spindle 4 of the cutting device, and the tightening nut 6 is mounted on the male screw portion 5a of the mounting portion 5. It is attached by screwing.

FIG. 2 shows a state in which the C chamfering 7a of the ferrite 7 is performed by using the electroformed grinding wheel 1. The chuck table 8 of the cutting device has a 45 ° inclined surface 9a. The tool 9 is fixed, and the ferrite 7 which has been subjected to the track processing is held on the inclined surface 9a, and the chamfering processing is performed by the electrocast grinding wheel 1 which moves the chuck table 8 in the arrow direction X and rotates at high speed. .

At this time, as shown in FIG. 3 (a) and FIG. 3 (b) in which the G portion thereof is enlarged, the lower end 3a of the electroformed grinding blade 3 of the electroformed grinding wheel 1 is positioned below the chamfered portion. Grinding is performed so that the C chamfer 7a is completely removed. With this configuration, even if the electroformed grinding blade 3 is worn, the cylindrical tip portion is always in contact with the grinding surface without lowering the grinding wheel 1, so that the adjacent projection is flat and good without being damaged. C chamfering is possible.

In this case, the chuck table 8 holding the ferrite 7 was moved, but the electroformed grinding wheel 1
The spindle 4 mounted with may be moved, that is, the electroformed grinding wheel 1 and the ferrite 7 (workpiece) may be moved in a direction relatively orthogonal to the rotational axis of the wheel.

4 (a) and 4 (b) show an example of manufacturing an electroformed grinding wheel. First, as shown in FIG. 4 (a), all except the outer peripheral surface of the disk-shaped wheel base K is masked M. Nickel plating solution P that is coated and contains diamond abrasive grains
And the electrodeposited layer R is electrodeposited on the outer peripheral surface of the wheel base through the anode plate Q until the electrodeposited layer R has a predetermined thickness.

Next, the blade is exposed by an etching process. As shown in FIG. 4B, the etching liquid is used after masking all except the portion to be etched (outer peripheral portion of one side of the wheel base K). S (sodium hydroxide 20%
Then, the exposed portion of the wheel base K is etched until the amount of protrusion of the grinding blade reaches a predetermined amount. After the etching, the wheel base K is taken out, washed, and all the masking M'is removed, whereby the electroformed grinding wheel can be manufactured.

[0012]

As described above, according to the present invention,
An electroformed grinding wheel consisting of a disk-shaped wheel base and a cylindrical electroformed grinding blade protruding in the same direction as the rotation axis is formed on the outer periphery of the wheel base, and the electroformed grinding wheel is used as a spindle. It is a method of performing grinding so that the electroformed grinding wheel and the object to be ground are relatively moved in the direction orthogonal to the rotation axis and the grinding blade is completely removed from the part to be ground. Therefore, the C chamfering of the track-processed ferrite can be always reliably processed with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state before mounting a spindle of an electroformed grinding wheel according to the present invention.

FIG. 2 is a perspective view showing a C chamfering state of a ferrite subjected to track processing by using an electroformed grinding wheel.

3A is a schematic cross-sectional view of a main part in a chamfered state, and FIG. 3B is an enlarged view of a G part thereof.

FIG. 4A is an explanatory view showing an electrodeposition process at the time of manufacturing an electroformed grinding wheel, and FIG. 4B is an explanatory view showing a cutting-out etching process.

FIG. 5A is a perspective view showing a conventional grinding wheel,
(B) is an explanatory view showing a chamfering processing state in which the grinding wheel is worn and the accuracy is deteriorated.

FIG. 6 is a perspective view of a track-processed ferrite.

[Explanation of symbols]

 1 ... Electroformed grinding wheel 2 ... Wheel base 2a ... Nut gripping part 3 ... Electroformed grinding blade 3a ... Tip lower part 4 ... Spindle 5 ... Mounting part 5a ... Male screw part 6 ... Tightening nut 7 ... Ferrite 7a ... C chamfer 8 ... Chuck table 9 ... Jig 9a ... Inclined surface

Claims (3)

[Claims] 1. An electroformed grinding wheel used for fine grinding such as C chamfering of track processed ferrite, comprising:
An electroformed grinding wheel comprising a disk-shaped wheel base and a cylindrical electroformed grinding blade formed on the outer periphery of the wheel base and protruding in the same direction as the rotation axis. 2. The thickness of the electroformed grinding blade is 0.05 mm to 0.
The electroformed grinding wheel according to claim 1, wherein the electroformed grinding wheel is 2 mm and the protrusion amount is 0.5 mm to 2 mm. 3. A method for performing fine grinding using the electroformed grinding wheel according to claim 1, wherein the electroformed grinding wheel mounted on the rotary spindle is rotated at a high speed, and the electroformed grinding wheel and an object to be ground. A fine grinding method using an electroformed grinding wheel, in which and are relatively moved in a direction orthogonal to the rotation axis, and grinding is performed so that the grinding blade completely passes through the portion to be ground.