JPS6035583Y2 - Spherical wrap device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a spherical lapping device that can perform lapping finishing of a spherical surface efficiently and precisely.

Conventionally, when lapping the spherical surface of a workpiece such as a lens, the workpiece 1 is fixed to a rotatable main shaft 2 with an adhesive 3, as shown in FIG.

A spherical wrap body 5 attached to the wrap shaft 4
is brought into contact with the workpiece 1 and a lapping pressure is applied in the axial direction a of the lapping shaft 4, and then the main shaft 2 and the lapping shaft 4 are rotated, and the lapping shaft 4 is swung in the direction indicated by the arrow. By doing this, the spherical surface of the workpiece 1 was lapped.

However, along with the swing angle of the wrap shaft 4 configured as described above, the direction of the wrap pressure applied in the axial direction of the wrap shaft 4, that is, the axial direction a, changes with the swing angle of the wrap shaft 4. , the distribution state of the lap pressure applied to the workpiece 1 changes significantly.

Therefore, the radius of curvature of the workpiece 1 tends to be larger than the radius of curvature of the wrap body 5, and it is nearly impossible to obtain a lapped surface with a uniform radius of curvature.

Furthermore, when the above-mentioned spherical wrap body 5 is used, when the lap pressure is excessive, the abrasive grains that are the lap agent cannot be uniformly distributed between the workpiece 1 and the wrap body 5,
Particularly, as shown in FIG. 2, the processing performance is extremely poor at the bottom 7 where there is less lapping agent 6.

That is, the amount of processing is large at the top end 8 where there is a lot of lapping agent 6, and the amount of processing is small at the bottom 7 where there is less lapping agent 6.

Therefore, there is a drawback that processing accuracy such as roundness and surface roughness of the lapped workpiece 1 is significantly deteriorated.

This idea was created by focusing on the various circumstances mentioned above, and its purpose is to set the lap pressure to be always constant in the vertical direction, and to maintain the relationship between the workpiece and the lap body. The present invention aims to provide a spherical lapping device that can improve processing efficiency and processing accuracy such as sphericity and surface roughness by uniformly distributing the lapping agent between the two surfaces. .

This invention will be explained below based on an embodiment shown in the drawings.

In FIG. 3, a workpiece 9 is fixed with an adhesive 11 to the tip of a rotatably provided main shaft 10. As shown in FIG.

A spherical wrap body 13 attached to one end of the wrap shaft 12 is in contact with the spherical recess 9 of the workpiece 9 .

A drive mechanism 15 such as an electric motor is connected to the wrap shaft 1 for rotating the wrap body 13 in the direction of the arrow 14□.
2 is connected to the other end.

One end portion of a U-shaped frame 16 is attached to this drive mechanism 15 .

A weight 17 is connected to the other end of the frame 16.

This weight 17, frame 16. The drive mechanism 15 and the wrap shaft 12 constitute a support mechanism 18.

The center of gravity of the integral part consisting of the support mechanism 18 and the wrap body 13 is set to coincide with the center of curvature of the wrap body 13, and is swingable in the direction of the arrow 14b.

This arrow 14. The swinging drive of the support mechanism 18 and the wrap body 13 in the direction is performed by a motor (not shown) via a crank mechanism whose one end is engaged with the drive mechanism 15.

FIG. 4 shows an enlarged view of the wrap body 13, in which a plurality of blind holes 19 are bored in substantially the lower half of the wrap body 13, extending from the outer spherical surface toward the center. The open ends of these blind holes 19 are tapered to have a slightly larger diameter than the other blind holes.

The blind holes 19 are filled with a wrap agent holder 20 made of a material softer than the wrap body 13, such as a sea wire, wax, or solder.

Of these, the sea wire is in the form of a woven fabric and is loaded into the blind hole 19 so that it can be easily replaced, and the wax is, for example, spermaceti wax or beeswax, and solder is also used. is a soft solder such as a tin-lead alloy, which is injected into the blind hole 19 in a molten state.

When the workpiece 9 is processed using the spherical lapping device having the above configuration, as shown in FIG. 5, the lapping shaft 12 is moved by the arrow 14. While rotating in the direction of arrow 14. When the lapping agent 21 is tilted in the direction, the lapping agent 21 near the recess 93 on the upper surface of the workpiece 9 is captured by the lapping agent holders 20 protruding above the upper surface of the workpiece 9.

Then, as the wrap shaft 12 rotates in the opposite direction as shown in FIG. In this state, the remaining portion is supplied between the workpiece 9 and the wrap body 13 while being held in the wrap agent holder 20 .

Therefore, arrow 14. of wrap axis 12. The lapping agent 21 supplied to the upper surface of the workpiece 9 as it swings in the direction spreads over the entire spherical surface of the recess 9 of the workpiece 9.

As a result, in combination with the fact that the vertical wrap pressure is always set to be constant, the concave portion 9. This improves machining accuracy in terms of sphericity and surface roughness, as well as machining efficiency.

As explained above, the spherical lapping device of this invention is constructed so that the lapping pressure in the vertical direction is constant, and a plurality of blind holes are bored in the lapping body in contact with the workpiece. Since the wrap agent holder is filled and the wrap agent is uniformly supplied between the workpiece and the wrap body as the wrap body swings, processing efficiency can be improved. At the same time, it is possible to improve the machining accuracy such as the sphericity and surface roughness of the workpiece.

[Brief explanation of drawings]

Fig. 1 is a partial vertical sectional view of a known spherical lapping device, Fig. 2 is a sectional view for explaining the drawbacks of conventional lapping, and Fig. 3 is a spherical lapping device according to an embodiment of the present invention. 4 is a partially cutaway front view of the wrap body of the spherical wrap device shown in FIG. 3, and FIGS. 5 and 6 are partially cutaway views showing the action of the spherical wrap device shown in FIG. 3. FIG. 9... Workpiece, 10... Spindle, 13
... Wrap body, 15 ... Drive mechanism, 1
8...Support mechanism, 19...Blind hole, 20
... Wrap agent holder, 21 ... Wrap agent.

Claims (1)

[Scope of utility model registration request] It has a rotatable main shaft that fixes the workpiece, a spherical wrap body that comes into contact with the workpiece and has a plurality of blind holes bored on its outer surface, and a drive mechanism that rotationally drives the wrap body. and a support mechanism that is swingable so that its center of gravity coincides with the center of curvature of the wrap body, and a wrap that is filled in the blind hole to capture the wrap agent and supply it between the workpiece and the wrap body. A spherical wrapping device comprising: a drug holder;