JPS63260754A - Chamfering equipment - Google Patents

Abstract

PURPOSE:To enable the outer edge part of a magnetic head or the like to easily perform chamfering of asymmetrical shape, by eccentrically placing the rotary center for the chamfered objective surface center of a workpiece and chamfering the outer edge part giving a predetermined tilt to the periphery of a cylindrical tool. CONSTITUTION:Holding a workpiece 6 of magnetic head or the like, forming a rectangular parallelepiped shape, to a holding part 8, when chamfering of oval shape 2aX2b with a point P serving as the center is performed for a chamfering objective surface 2AX2B with a point O serving as the center, the rotary center of the workpiece 6 is displaced from ll' to mm' by an X-direction eccentric amount adjusting screw 9. And setting a tilt angle range of the workpiece 6 to a control unit 21, adjusting an eccentric amount of an eccentric disc 14 and performing rotary motion and swivel motion in a swivel direction 5 of a cylindrical grinding wheel 1, a chamfering device, which rotates the workpiece by a motor 16 in a direction 7 while changing tilt angle continuously by swiveling a rotary table 18, chamfers the workpiece pressing it by a spring 11. Further for eccentricity, when it is performed in an axial direction bb, a Y-direction eccentric amount adjusting screw 10 is used. In this way, asymmetrical chamfering can be easily performed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a chamfering device, and in particular is used to chamfer an asymmetrical shape on the outer edge of a rectangular parallelepiped workpiece such as a magnetic head. This invention relates to a chamfering device suitable for.

[Prior Art] Conventionally, a method of chamfering the outer edge of a rectangular parallelepiped magnetic head made of a brittle material such as ceramics involves polishing using a lapping tape that runs at high speed. It has been known.

It is also known that chamfering of eyeglass lenses is carried out by grinding using a grindstone.

A related technique of this type is, for example, Japanese Patent Publication No. 58-28071.

[Problems to be Solved by the Invention] The above-mentioned prior art does not give consideration to the formation position of the single-chamfer shape when chamfering the outer edge of the surface to be machined (which is rectangular) of a rectangular parallelepiped magnetic head. Ta. Therefore, the outer edge of the surface to be machined is chamfered in an asymmetrical shape, that is, at a position where the center of the chamfer shape (for example, an elliptical shape) is eccentric by a predetermined eccentric amount with respect to the center of the surface to be machined. However, it was difficult to perform chamfering on such a chamfered shape.

An object of the present invention is to provide a chamfering device that can easily chamfer an asymmetrical shape on the outer edge of a rectangular parallelepiped, such as a magnetic head, by improving the problems of the prior art described above. It is something to do.

[Means for Solving the Problems] The configuration of the chamfering device according to the present invention for solving the above problems uses a cylindrical tool to form an asymmetrical shape on the outer edge of a rectangular parallelepiped workpiece. A chamfering device that performs chamfering includes a tool driving means that rotates a cylindrical tool, a tool device section that has a swinging means that provides swinging motion in the axial direction of the cylindrical tool, and a tool drive unit that rotates a workpiece. an eccentricity adjustment means capable of eccentrically rotating the center of rotation of the workpiece by a predetermined eccentricity with respect to the center of the workpiece; The tool is equipped with a tilt angle imparting means capable of imparting an inclination, and a workpiece holder having a load means capable of pressing the workpiece against the outer periphery of the cylindrical tool with a predetermined load.

Further details are as follows.

The above purpose is to eccentrically position the rotation center of the workpiece by a predetermined amount of eccentricity with respect to the center of the surface to be machined, and to This is achieved by chamfering the outer edge of the surface to be processed while applying a predetermined inclination to the workpiece and pressing the workpiece toward the rotation center.

[Operation] The eccentricity adjustment means eccentrically sets the rotation center of the workpiece by a predetermined eccentricity with respect to the center of the workpiece, and the inclination angle imparting means causes the workpiece to be eccentric by a predetermined eccentricity with respect to the outer periphery of the cylindrical tool. gives the slope of The tool driving means rotates the cylindrical tool, and the swinging means swings the cylindrical tool in its axial direction. Then, the workpiece is rotated around the rotation center by the workpiece drive means, and the workpiece is pressed against the outer periphery of the cylindrical tool with a predetermined load by the load means. By machining, it is possible to chamfer the outer edge in a desired symmetrical shape.

[Example] Hereinafter, the present invention will be explained by examples.

FIG. 1 is a perspective view showing a chamfering device according to an embodiment of the present invention.

The outline of the apparatus of this embodiment will be explained using FIG. 1. This chamfering apparatus has a tool device section 27 and a workpiece holding section 28, and the tool device section 27 has a cylindrical shape. A cylindrical grindstone rotation motor 4, which is a tool driving means that rotates a cylindrical grindstone 1 related to a shaped tool. The present invention relates to a rocking means that gives rocking motion to the cylindrical grindstone 1 in the axial direction. Crank 13° eccentric disc 14. It has a swing motor 15, and
The workpiece holding section 28 includes a workpiece rotation motor 16, which is a workpiece drive means that rotates the workpiece 6, and whose rotation center is eccentric by a predetermined eccentric amount with respect to the center of the workpiece 6. The present invention relates to an eccentric amount adjusting means that can adjust the eccentricity. X-direction eccentricity adjusting screw 9. Y direction eccentricity adjustment screw 10. 5-turn table 1 related to inclination angle imparting means capable of imparting a predetermined inclination to the workpiece 6 with respect to the outer circumference of the cylindrical grindstone 1
8° Workpiece tilt motor 20. It has a workpiece load setting spring 11 which is a loading means that can press the workpiece 6 against the outer periphery of the cylindrical grindstone 1 with a predetermined load.

This will be explained in detail below.

3 is a grindstone shaft head that supports the cylindrical grindstone 1; 22 is a grindstone shaft head that supports the cylindrical grindstone 1;
This grindstone shaft head 32 is a slide table on which the cylindrical grindstone rotation motor 4 is placed.
A crank 13 is connected to the crank 13, and an eccentric disk 14 directly connected to a swing motor 15 is connected to the crank 13. By adjusting the amount of eccentricity of the eccentric disc 14, a predetermined amplitude can be given to the rocking motion of the cylindrical grindstone 1 in the rocking direction 5. 2 is the rotation direction of the cylindrical grindstone 1.

8 is a workpiece holding part that holds the workpiece 6, and this workpiece holding part 8 is provided with an X-direction eccentricity adjusting screw 9. A Y-direction eccentricity adjusting screw 10 is attached. 12 controls the rotation of the workpiece rotation motor 16 from the workpiece holding section 8.
This is a holder part that enables the workpiece 6 to be rotated in the rotational direction 7, and a workpiece load setting spring 11 is attached to this holder part 12. 17 is the holder portion 12. A slide base on which the workpiece rotation motor 16 is mounted; 18 is a rotary table on which the slide base 17 is rotatably mounted; 20 is a rotary table for imparting a predetermined tilt angle and rocking motion to the rotary table 18; The workpiece tilting motor, 19, is capable of rotating in its swing direction.

25 is a crank connected to the slide base 17;
4 is an eccentric disc connected to the crank 25 and directly connected to the workpiece escape motor 23.

21 is a control device that can continuously change the inclination angle of the workpiece 6 within a predetermined range while the workpiece 6 is being rotated by the workpiece rotation motor 16.

The operation of the chamfering machine configured in this way.

This will be explained using FIGS. 1 to 3.

Figure 2 shows how to give the eccentricity ΔX and the machining shape in this case. Figure (1) is a plan view, and Figure (II) is this (1).
The AA sectional view in the figure, Figure 3, shows how to give the eccentricity Δy,
The machining shape in this case is shown.

(1) Figure is a plan view, (II) figure is B- of this (I) figure.
It is a sectional view of B.

First, the workpiece 6 having a rectangular parallelepiped shape is held by the workpiece holding section 8 . Then, a predetermined amount of eccentricity is given to this workpiece 6.

For example, with reference to Figure 2, the size of the surface to be machined is 2.
AXjB, whose center is the 0 point, and on the outer edge of this surface to be processed is an elliptical shape (major axis 2a x minor axis 2b) having centers at two points eccentric by ΔX on the a-a axis, that is, the X axis.
When performing chamfering, use the X-direction eccentricity adjustment screw 9 to change the rotation center of the workpiece 6 from QQ' to
It is sufficient to move it to m' and process it.

In addition, an elliptical shape (centered at point p' which is eccentric by Δy on the b-b axis, that is, the y-axis) is attached to the outer edge of the surface to be machined.
When chamfering the major axis 2a and the minor axis 2b), use the Y-direction eccentricity adjustment screw 10 to move the rotation center of the workpiece 6 to nn' as shown in FIG. do it.

Next, the amount of eccentricity of the eccentric disk 14 is adjusted. Control device 21
, the range of the inclination angle of the workpiece 6 (α, ~α2゜α2〉α
, ).

Here, if you turn on the single chamfer processing device, 1 cylindrical grindstone 1
rotates in the rotational direction 2 and swings in the swinging direction 5 with a predetermined amplitude. The workpiece rotation motor 16 rotates, the workpiece 6 rotates in the rotation direction 7, and the one-turn table 18 swings in the swing direction 19, thereby reducing the inclination of the workpiece 6 with respect to the outer circumference of the cylindrical grindstone 1. The angle is within the predetermined range (α
1 to α2). The slide base 17 moves forward, and the workpiece load setting spring 11 causes the workpiece 6 to move forward.
is pressed against the outer periphery of the cylindrical grindstone 1 with a predetermined load.

In this state, the chamfering of the surface to be machined progresses, the asymmetrical chamfering shown in FIG. 2 or 3 is performed, and after a predetermined period of time has elapsed, the chamfering device is turned off.

When the slide base 17 is moved backward by the workpiece escape motor 23 and the workpiece 6 is removed from the workpiece holder 8, a workpiece in which the desired chamfered portion 26 is formed is obtained.

The processing accuracy of this processed product will be explained using FIG. 4.

FIG. 4 is a machining accuracy characteristic diagram of a workpiece machined by the chamfering apparatus according to FIG. 1.

As is clear from this FIG. 4, the eccentricity Δ is applied to the workpiece 6.
When processed by giving X and Δy, the center of the processed product.

The eccentric position Pv P' measured from the point is the set value ΔX,
It agrees extremely well with Δy.

A specific example will be shown.

For the case where the eccentricity ΔX is set to 0, 0.6, and 1.13n+m, respectively, the outer diameter is 100mmφ2 and the width is 20nn.
cylindrical whetstone 1 (diamond whetstone), whetstone rotation speed =
70rp+n, number of oscillations/oscillation amplitude = 10cpm/6m
m, and the tilt angle α, ~α2 = 1° ~ 5°.

When chamfering was performed with a load of 300gf, the center of the workpiece. The eccentric position p measured from the point is 0 and 0, respectively.
．． 6.1.13+nm, which was in good agreement with the set value.

According to the embodiment described above, there are the following effects.

■, At the outer edge of the surface to be processed of the rectangular parallelepiped-shaped workpiece 6,
Asymmetrical chamfering can be easily performed.

■, X-direction eccentricity adjustment screw 9. Y direction eccentricity adjustment screw 1
0 and eccentrically eccentrically the center of rotation of the workpiece 6 by a predetermined amount in advance, it is possible to chamfer an asymmetrical shape with high precision.

(2) Since the cylindrical grindstone 1 is oscillated in the oscillation direction 5, the grinding surface of the cylindrical grindstone 1 is uniformly polished, and the shape accuracy of the machined surface of the workpiece 6 is excellent.

In addition, in the said Example, the cylindrical tool was used as the cylindrical grindstone 1, but it is not limited to the cylindrical grindstone 1, but a disc-shaped grindstone may be used.

Alternatively, a cylindrical tool coated with abrasive tape may be used. In this way, a new polishing tape is always fed out and comes into contact with the workpiece 6, so the polishing efficiency is very high.In addition, since the cylindrical tool does not wear out, the workpiece There is an advantage that the shape accuracy of the machined surface of No. 6 does not deteriorate.

Furthermore, in the embodiment, the workpiece tilting motor 2
0 is controlled by the control device 21 to swing the rotary table 18 in the swing direction 19, but this swing does not have to be performed. In that case, the motor 2
If a constant inclination angle α is given to the rotary table 18 by the angle o, the chamfering process having a constant inclination angle can be performed on the chamfered portion 26 of the workpiece 6 in accordance with the inclination angle.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a chamfering device that can easily chamfer an asymmetrical shape on the outer edge of a rectangular parallelepiped, such as a magnetic head. .

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a chamfering device according to an embodiment of the present invention, Fig. 2 shows how to give the eccentricity ΔX and the machining shape in this case, (1) is a plan view; The (■) figure is a sectional view taken along the line A-A of this CI), Figure 3 shows how to give the eccentricity Δy and the machining shape in this case, and the (I) figure is a plan view.
The figure (■) is a sectional view taken along line B-B of this figure (1), and the figure 4 is
2 is a machining accuracy characteristic diagram of a workpiece machined by the chamfering device according to FIG. 1. FIG. 1... Cylindrical grindstone, 4... Cylindrical grindstone rotation motor,
6...Workpiece, 9...X-direction eccentricity adjusting screw, 1
0... Y direction eccentricity adjusting screw, 11... Workpiece load setting spring, 13... Crank, 14... Eccentric disc, 15... Rocking motor, 16... Workpiece Object rotating motor, 18... rotary table, 20... workpiece tilting motor, 27... tool device section, 28... workpiece holding section.

Claims (1)

[Claims] 1. In a chamfering device that uses a cylindrical tool to chamfer an asymmetrical shape on the outer edge of a rectangular parallelepiped workpiece, a tool driving means for rotating the cylindrical tool; a tool device section having a swinging means for giving a swinging motion in the axial direction of a cylindrical tool; a workpiece driving means for giving rotation to a workpiece; Eccentricity adjustment means that can eccentricize by the amount of eccentricity;
An inclination angle imparting means capable of imparting a predetermined inclination to the workpiece with respect to the outer circumference of the cylindrical tool; and a load means capable of pressing the workpiece against the outer circumference of the cylindrical tool with a predetermined load. What is claimed is: 1. A chamfering device comprising: a workpiece holding section. 2. The chamfering device according to claim 1, wherein the cylindrical tool is a cylindrical grindstone. 3. The chamfering device according to claim 1, characterized in that an abrasive tape is wrapped around the cylindrical tool.