JPS6052259A - Lapping machine - Google Patents

Abstract

PURPOSE:To eliminate such a risk that a workpiece trips over or turns over in the case of the small diameter of the workpiece, by attaching the workpiece to the convex spherical surface side of a spherical bearing, and as well by applying both pressing force for lapping and driving force for sliding to the concave spherical seat side. CONSTITUTION:The convex spherical part of a workpiece holder 17 to which a workpiece 2 is secured is fitted into the concave spherical seat of a concave spherical part 18, and a load P is applied to a loading rod 5 which is also applied with slide force by means of a drive arm 7. With respect to the sliding direction of the workpiece for lapping, indicated by the arrow A, the workpiece is stable irrespective of its shape within a range of 0<=h2-h1<=b even though the diameter (a) of the workpiece is small, where h1 is the vertical distance between the lapping surface 1 and the center point O' of the convex spherical surface of the workpiece holder 17, and h2 is the height of the action point of a resultant force F for thrusting the holder 17 from the lapping surface 1, thereby occurrence of scratches is limited to be minimum. Further, (b) is the diameter of a circular plane-projection of the holder 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a processing machine for performing lapping processing.

[Background of the invention]

FIG. 1 is a partial cross-sectional view showing the structure of one example of a conventional lapping machine. 1 is a lapping surface plate, and 2 is a workpiece to be lapped. The work 2 described above is attached to a work holder 3, and the work holder 3 is supported by a load rod 5 via a spherical bearing 4.

Generally, the work holder 3 is provided with a spherical seat, the load rod 5 is configured in the shape of a bead, and both of the above members are fitted to form the spherical bearing 4.

A suppressing load is applied to the load rod 5 as shown by the arrow P, and the drive arm 7 is slidably supported by a slide bearing 6 provided at the tip thereof, and the other end of the drive arm 7 is held by a bearing 8. and fit onto the eccentric shaft 9. The above eccentric shaft 9 is
The rotary disk IN is mounted eccentrically with respect to the rotating disk IN mounted on the rotary shaft of the rotor 120. 10 is a feed screw for adjusting eccentricity i+. As a result, the load rod 5 is reciprocated in the X direction (left-right direction in the figure).

Although not shown, the load rod 5 is driven in the T-Y direction (perpendicular to the plane of the paper) by a means similar to the X-direction reciprocating drive means described above.
It is also driven back and forth.

As described above, the load rod 5 that is reciprocated in the x and y directions and the workpiece 2 supported by it are placed on the second
A surge locus 13 is drawn as shown in the figure.

In the conventional lapping machine described above, it is desirable that the workpiece 2 be pressed against the lapping surface plate with uniform pressure and slide in a serge pattern as shown in FIG.

FIG. 3 is an explanatory diagram of the force exerted on the workpiece 2.

When the work holder 3 to which the work 2 is fixed moves in the direction of the arrow, there is a problem that the work trips or falls.

When the height from the polished surface of the friction cuff 11-F1 on the polished surface of the workpiece 2 to the center O of the spherical bearing 4 is h, the moment MF generated by the frictional force is Mp = F @h.

On the other hand, the moment y2Mo due to the wedge action of the wrap oil
If the radius of workpiece 20 is fa, then P e a 1 M
O≧My is a stable detention condition.

Pea ten M. <　M　F It becomes unstable.

Based on the above study, the conditions for the workpiece 2 to undergo lamp polishing stably are as follows: P>(MF-M□)-1(i'sh-Mg)-a a.

When considering the stumbling of a workpiece that falls at point C, M o
Since << MF, the above formula is P≧−Jl' h (!
:f, fru.

Considering the friction coefficient μ=-, the above equation becomes μSπ, where μ≦1 in normal lapping processing, so 1≦K is the stable condition at point C.

In this way, in the conventional workpiece support method in lapping (Fig. 3), the stability at the front end of the workpiece is determined by the ratio of the workpiece radius a and the height h from the polished surface to the center of the spherical bearing. For tall workpieces or narrow workpieces,
During ramp machining, the workpiece is at its toe level on the surface of the lapping surface, and the lapping abrasive grains 19, which are in a semi-fixed state, are scraped off as shown in Figure 4, resulting in damage to the good surface quality of the polished surface (scratches occur), etc. There was a problem. In the worst case scenario, the workpiece would fall and cause deep scratches on the surface of the lapping plate, making lapping impossible.

In conventional lapping machines, as mentioned above, if the radius (or @) a of the workpiece 2 is small, mechanical stability is lost, so a dummy workpiece (not shown) is placed around the outer circumference of the workpiece. Stability has been obtained by apparently increasing a, but this reduces the required polishing efficiency of the workpiece and also requires the surface area of the lapping surface to be larger than originally required, resulting in poor efficiency and economic efficiency. Both were bad.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a lapping machine which is free from the risk of colliding or falling even when a dummy work is not used when the radius or width of the work is small. do.

[Summary of the invention]

In order to achieve the above object, the lapping machine of the present invention supports a C workpiece via a spherical bearing, and performs lapping processing in which the workpiece is pushed toward a ramp surface plate and slid against the lapping surface plate. The machine is characterized in that the workpiece is attached to the convex spherical surface τ (U) of the spherical bearing, and a pressing force for lapping and a driving force for sliding are applied to the concave spherical spacer of the spherical bearing. .

[Example of invention]

Next, one embodiment of the present invention will be explained with reference to FIG. This embodiment is an improvement by applying the present invention to an avant-garde conventional device, and the lap surface plate J1 work 2, load rod 5, and sliding bearing 6 are shown in FIG. 3 with the same drawing reference numbers as in FIG. 3. The components are the same or similar to those in the conventional example.

A concave spherical bearing 18 having a concave spherical seat is attached to the lower end of the load rod 5 to form a work holder 17 having a convex spherical surface that matches the concave spherical bearing 18 described above.

The work 2 is fixed to the work holder 17 by an appropriate method (adhesion, adhesive) such as screwing.

The convex spherical part of the work holder 17 is fitted into the spherical seat of the concave spherical bearing 18, and a load P is applied to the load stop 5, and a sliding force is applied to the load stop 5 via the drive arm '7. . For convenience of explanation: Pestle 5 where sliding is performed in the direction of the arrow directly above.
Let me explain.

The center of the convex spherical surface formed on the work holder 17 is shaved.

Let the radius between the spheres be t.

In this example, the planar projection shape of the work boulder 17 is circular, and its diameter -? 1l-2b.

The concave spherical bearing 18 pushes the τ soak holder 1f in the feeding direction via the convex spherical surface. The resultant force of the force is F, and the height of the point of application of the resultant force F from the polishing surface is hl, and from the polishing surface Let the vertical distance to the center point 0' of the convex spherical surface be soh1.

Regarding the sliding direction of the workpiece for lap polishing in the direction indicated by the arrow, the front end of the workpiece is C and the rear end is B. These points C,
The mechanical stability conditions for H are as follows. That is, 0
At the point, My 10MO1P(a-1-b)≧O but M
FI = F (hl - hl), and at point B MF
1 + M□ -Pa≦0. Here, Mo due to the dynamic pressure of the lap oil is ignored because it is relatively small, and the stability condition becomes 11 ≤ h2- b] 5th 1,, A.

However, the friction coefficient μ”P is μ in normal lapping processing.
Since ≦1, -a≦h2-hx≦a10 is 41 cases of stability of the spherical bearing according to the present invention.

Therefore, according to the present invention, no matter how small the workpiece hand gB becomes, mechanical stability can be obtained as long as the spherical bearing is used in the range O≦h2−hwork≦b, so it is stable regardless of the workpiece shape. You can get sex.

If the height of the workpiece is high, the radius R of the spherical bearing may be increased. In the example shown in FIG. 5, the center 0' of the work holder 7, which has a convex spherical surface, is located closer to the lap surface plate (lower in this figure) than the contact surface (polished surface) between the workpiece and the lap surface plate.
ζ, and h1≧0, but even if the center O' of the convex spherical body 7 is located closer to the workpiece than the polishing surface (hl<0), the dimension hl is different from that of the conventional machine. If the dimension is hl (h) compared to the 6 dimensions shown in FIG.

In this embodiment (FIG. 5), the sliding surfaces of the work holder 7, which has a convex spherical body, and the concave spherical body 8 are lubricated with oil. The sliding surfaces of the concave and convex spherical bodies do not necessarily have to be in contact with each other at all times, and may be interlayered by appropriately providing oil holes or oil grooves on the m@ surface.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to impart mechanical stability to a workpiece during lapping processing with a simple configuration, thereby preventing the occurrence of scratches that are a problem during lapping processing. can be kept to a minimum, and the surface quality of the polished surface can be improved.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of an example of a conventional lapping machine;
The reason is the illustration of the Lissajous figure in lapping processing, Part 3.
The figure is an explanation of the female state of the workpiece in the lapping machine according to the present invention, the fourth factor is also the constant state CV diagram, and the fifth figure is the main part #AAl1 of the lapping machine of the present invention. 1... Lap surface plate, 2... Work. 3... Work holder, 4... Spherical bearing. 5...Log production, 6...Sliding bearing. 7...MA drive arm ・8...Bearing. 9...Occurrence axis, lO...Feed screw. 11...Rotation placement, 12...Motor. 13...su → Noosh trajectory. 17... Work holder in which a convex spherical body is formed. 18... Four ball tooth body bearing, 19... Abrasive grain. Representative Patent Attorney Akio Takahashi Figure 1 Y Figure 2 Figure 3 Figure φ

Claims (1)

[Claims] 1. In a lapping machine that supports a workpiece through a spherical bearing and slides the workpiece against the lapping surface plate while pressing the workpiece toward the lapping surface plate, the workpiece is supported by the spherical bearing. A lapping machine, characterized in that it is attached to a convex spherical surface side and is configured to apply a pressing force for lapping and a driving force for sliding to a concave spherical spacer of the spherical bearing. 2. The lamp processing machine according to claim 1, wherein the center point of the spherical surface of the spherical bearing is set closer to the lap surface plate than the lap surface of the lap surface plate.