JPS6364276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mass centering machine.

A mass centering machine is a machine that determines the processing center of a workpiece as close to the center of mass as possible in order to reduce the amount of unbalance correction after processing a rotating body.A conventional example is shown in Figure 1. . As shown in the figure, the conventional device attaches the workpiece 02 on a softly supported rotary table 01, rotates it at high speed with a center as close to the center of mass as possible, and after determining the center, is fixed and a center hole is drilled in the center using a drill 03.

However, these conventional mass centering machines were developed primarily for heavy workpieces such as automobile crankshafts, and they do not take into consideration very small and light workpieces, making it difficult to ensure accuracy. It was hot.

In view of such conventional circumstances, the present invention aims to enable highly accurate center massaging even for small and lightweight workpieces. a clamping device for attaching the workpiece to the rotary table; and a means located on the axis of the rotary table to generate a laser beam for machining a center hole toward the rotary table. It is characterized by

Embodiments according to the present invention will be described below based on the drawings. FIG. 2 is a front view schematically showing the apparatus of the embodiment, and in the figure, 1 is a lightweight rotary table made of plastic, light alloy, etc., and is rotatably supported by a bearing 2. . Bearing 0
2 is an elastic support member (O-ring, etc.) 3 in the radial direction.
It is supported by Rotation of motor 4 is transmitted to rotary table 1 via pulley 5 and belt 6. The workpiece 7 is fixed to the top of the rotary table 1 by a clamping device 8. A laser beam generator 9 is disposed on the axis of the rotary table 1, and a fifth
Since it has a long hole-shaped slit 10 as shown in the figure, the emitted laser beam falls on the workpiece 7 in an irradiation pattern P as shown in FIG. 4 (a view taken along the - arrow in FIG. 2).

In the above apparatus, when the rotary table 1 is rotated at high speed by the motor 4 via the belt 6, the workpiece 7 rotates quietly in the state shown in FIG. 3, with zero vibration at the center of gravity. Furthermore, although vibration becomes large at low speeds, this does not become excessive due to the elastic support member 3, which is an appropriate damper. When the beam emitted from the laser beam emitter 9 is aimed at the center of the workpiece 7, it has the effect of melting the center of the workpiece 7. However, due to the special shape of the slit 10, only the center of gravity remains stationary and the area around it swings around, so that only the center of gravity receives a large average amount of light, which causes it to be extremely heated and a center hole to be drilled. Since the surrounding area is appropriately cooled, the center hole will not shift. Therefore, a center hole is formed at the center of gravity with very high precision.

As explained above, according to the present invention, the workpiece is fixed on a lightweight rotary table and rotated at high speed to perform laser processing, so that center kneading of a small and lightweight workpiece can be performed with high accuracy and ease.

[Brief explanation of drawings]

FIG. 1 is a front view of a conventional device. 2nd to 5th
The figures show an embodiment according to the present invention, Fig. 2 is a schematic front view, Fig. 3 is a diagram showing the relationship between the rotational speed of the rotary table and vibration of the center of gravity, and Fig. 4 is a view taken along the - arrow in Fig. 2. , FIG. 5 is a plan view showing the slit of the laser beam generator. 1...Rotary table, 2...Bearing, 3...Elastic support member, 4...Motor, 7...Work, 9...
Laser beam generator.

Claims (1)

[Claims] 1. A lightweight rotary table, a bearing for rotationally supporting the rotary table, means for elastically supporting the bearing in the radial direction, a clamp device for attaching a workpiece to the rotary table, and a clamp device located on the axis of the rotary table. A center kneading machine characterized by comprising: means for generating a laser beam for machining a center hole toward a rotary table.