JPS61192472A - Globe machining device - Google Patents

Abstract

PURPOSE:To enable globe to be machined in high precision for a long period by engraving a V-shaped groove on the surface of a lower lap eccentrically against rotary axis, thereby suppressing abrasion of an upper lap. CONSTITUTION:While lapping powder being fed in the position of a globe 7, upper and lower laps 5, 6 are, respectively, rotated in the direction 10, 11, a V-shaped groove circle 13 on the lower lap 6 is rotated eccentrically against rotary axis line 14. Each of the globes is supported by three points, i.e. the lapping surface 12 of the upper lap 5, and both side walls of the V-shaped groove 13 and moves round by turning. However, since lapping speeds at these three points differ from each other, slipping motion takes place between the globe 7 surface and the upper and lower laps 5, 6, the globe 7 moves along the V-shaped groove 13. The whole surface of the globe 7 is uniformly lap- finished, its specified sphericality is attained, and moreover, abrasive progress of lapping surface 12 is suppressed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a sphere machining device suitable for machining spheres made of ceramics, for example. As such, they are widely applied in various technical fields, and in particular, ceramic spheres are attracting attention for their application to special uses that take advantage of their corrosion resistance, heat resistance, wear resistance, etc. In general, regardless of whether the sphere is made of ceramic or not, it is required to have a certain diameter with good sphericity, so a processing device suitable for this is required.

Figure 3 is an example of this, showing a lower lap plate made of steel disc (
1), a steel disc-shaped upper lapping machine (2) is coaxially opposed to the lower lapping machine (1) and the upper lapping machine (21).
A holding plate (3) that supports a spherical workpiece (■) is placed between them. A plurality of spherical workpieces (8) are mounted on the support part formed on the same circumference of the holding plate (3). It is supported and fitted into the V-shaped annular groove (1a) of the lower lapping machine (1), and the pressure applied through the rotation of the lapping machines (1) and (2) and the upper lapping machine (2) The material rolls in the annular groove (1a), and during this time, a lapping agent is supplied from the outside and processed.

However, in this processing device, not only the pressure applied via the upper lapping machine (2), the amount of lapping agent supplied, and the interval between the lapping agents subtly affect the amount of lapping, but also the V-shaped annular groove (1a
) is set coaxially with the rotation axis (6) of the lapping machine (11, (2)), so a wear groove (4) is formed on the lapping machine (2) due to wear. - It has the disadvantage that it is very difficult to perform proper processing with high efficiency.It also has problems with product yield, and requires improvement.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a sphere machining device that can process a plurality of spheres with high precision.

[Summary of the invention]

A V-shaped groove forming an annular ring is carved eccentrically with respect to the rotation axis of the lower lapping plate.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 show the sphere processing apparatus of this embodiment. This device is, for example, a steel disc-shaped upper lapping machine (5).
and a lower lapping machine (6) made of steel, for example, disposed coaxially opposite to the lower surface of the upper lapping machine (5), and between these upper and lower lapping machines (5) and (6). A holding plate (8) that removably holds a ceramic sphere (force...) such as 5iaN4 (silicon nitride) that is interposed and lapped to a true sphere, and a lower lapping plate (6) Ω.
A first rotary drive mechanism (not shown) that rotationally drives a rotary shaft (6a) coaxially connected to the lower surface in the direction of arrow α1, and a rotary shaft (6a) coaxially connected to the upper surface of the upper lapping machine (5). 5a
) is rotated in the arrow αD force direction (not shown), and the lower lapping machine (6) is rotated by the upper lapping machine (5).
It consists of a pressure mechanism (not shown) that applies a predetermined pressure to the machined area, and a lapping agent supply mechanism (not shown) that supplies a lapping agent such as diamond powder to the processing area.

Thus, the lower surface of the upper lapping machine (5) is a flat lapping surface α2. On the other hand, on the upper surface of the lower lapping plate (6) facing parallel to the lapping surface a4, a V-shaped groove α-shaped having a circular ring is carved. This 7-shaped groove 0 has a 7-shaped cross section. Also, the center of this V-shaped groove αken is
The upper and lower lapping machines (5) and (61) are provided eccentrically by an eccentric amount ΔB with respect to the rotational axis αa of the lapping machines (61).

However, in the sphere processing apparatus having the above configuration, the holding plate (
8) Place the sphere (7)... at a certain position in the V-shaped groove α■. Next, the pressure mechanism KJ:, 9 upper lapping machine (5) is lowered in the four directions of the arrow α, and the sphere (7)... is compressed by the upper and lower lapping machines (5), (61). Power: Upper and lower lapping machines (5) while supplying lapping agent to the area.

(6) are rotated in the directions of arrows αG and (1i1), respectively. As a result, the V-shaped groove α rotates eccentrically with respect to the rotation axis (L4). At this time, the sphere (force... It rolls uniformly on the lapping surface (I) of the lapping machine (5).

Thus, each sphere (force...) has a wrap surface (13
It rolls while being supported at three points: and the both side wall surfaces of the 7-shaped groove 0. However, since the lapping speeds at the three points above are different, sliding motion occurs between the surface of the sphere (7) and the upper and lower lapping machines (5) and (6), resulting in poor lapping. It will be done. At the same time, the sphere (7)... is...

The rotating shaft moves within the V-shaped groove u3. Therefore, the sphere (
The force... can uniformly lap the entire surface and obtain the desired sphericity.Furthermore, the above-mentioned sphere (force...) rolls uniformly on the band-shaped area of the lap surface α2, so Since the progress of wear on the lapped surface α2 is suppressed and the lapped surface α2 can maintain a constant flatness over a long period of time, the machining accuracy of the sphere (force...) can be maintained at a constant level.

In the above embodiment, the rotation of the upper lapping machine (5) may be stopped and only the lower lapping machine (6) may be rotated. Furthermore, the upper and lower lapping machines (5) and (6) may be arranged eccentrically from each other. Furthermore, the V-shaped groove 1 may also be a groove with an inverted trapezoidal cross section instead of an exact 7-shaped groove. Furthermore, as shown in Fig. 3, a pair of V-shaped grooves ue, αη forming a ring eccentric by an eccentric amount ΔR are carved in the lower lapping machine (6) at symmetrical positions across the rotational axis I. may be set. In this case, the number of spheres (forces...) that can be processed is doubled, improving processing efficiency.

Furthermore, the number of such V-shaped grooves is not limited to one pair, and for example, three to five V-shaped grooves may be provided.

〔Effect of the invention〕

In the sphere machining apparatus of the present invention, the V-shaped groove is carved eccentrically with respect to the axis of rotation in the lower lapping machine, so that wear of the upper lapping machine can be suppressed. Therefore, the sphere can be processed with high precision over a long period of time, and the upper lapping machine can be replaced less frequently, making it more economical. Particularly, when the present invention is applied to spherical processing of ceramics, which are hard and brittle members, remarkable effects are achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a sphere processing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the lower lapping machine of FIG. 1, and FIG. 3 is a plan view of the lower lapping machine of another embodiment of the present invention. Fig. 4 is a configuration diagram of a conventional sphere machining device. gutter groove. a4...Rotation axis line. Agent: Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2

Claims (2)

[Claims] (1) An upper lapping machine having a flat lapping surface formed on one end surface, and an opposing surface facing parallel to the lapping surface, and is driven to rotate around a rotation axis perpendicular to the opposing surface, and A sphere machining device characterized in that it comprises a lower lapping machine in which a circular V-shaped groove is carved eccentrically with respect to the rotational axis on the opposing surface. (2) The sphere machining device according to claim 1, wherein a plurality of V-shaped grooves are carved.