JPH0425362A - Processing method for curved face of glass part - Google Patents

Abstract

PURPOSE:To finish a lot of the bodies to be worked in the same quality, by forming the external shape and curve chamfering with their grinding simultaneously by a grinding grindstone equipped with the curve chamfering, fixing the main face of this formed glass part to a polishing machine with its being made upward and subjecting the main face to brush polishing. CONSTITUTION:The external shape and curve chamfering are formed with their grinding simultaneously by the grinding grindstone 2 equipped with the curve chamfering, in the case of polishing the external shape of a plate like glass part 1 and the main faxce making a curve face with their forming. Then, the main face of this formed glass part 1 is fixed to a polishing machine 5 with its making upward and a polishing face is obtained with the main face being subjected to brush 4 polishing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a processing method for shaping the outer shape of a plate-shaped glass component, such as a sapphire cover glass for a watch, chamfering it, and obtaining a polished surface.

Common materials include crystals such as sapphire, ceramics in general,
It is applicable to processing amorphous materials such as inorganic glass and other hard and brittle materials.

[Conventional technology]

As shown in the cross-sectional views of Fig. 3 (A), (B), and (C), the conventional technique 1 (i) is to place a glass part (l), which is a workpiece, on a round plane as shown in the same figure (a). shape, and the same figure (
A flat surface number 1' was formed by inclined grinding as shown in b).

Thereafter, as shown in FIG. 3C, each glass component l is fixed to the chuck 8, and while being rotated as shown by arrow a, the flexible buff 7 is pushed obliquely onto the flat part l'. By applying the process, the process changed from a flat chamfer to a curved chamfer.

[Problem to be solved by the invention]

The above method had the following drawbacks.

In other words, ■Round shapes become the mainstream, and it is not possible to accommodate the diversity of designs.

■By chucking individual glass parts each time,
The dimensions of the chamfer varied.

■Individual processing takes time and is not suitable for mass production.

There were problems such as this, which increased the manufacturing cost, and was not preferred in practice.

The present invention aims to solve these problems.

[Means to solve the problem]

The means adopted by the present invention to achieve the above object is a method of shaping and polishing the outer shape of a plate-shaped glass component and the main surface of the curved surface, using a grinding wheel equipped with a d-chamfer. The process of simultaneously cutting the outer shape and curved chamfer four times, fixing the molded glass part on a polishing machine with the main surface σ facing up, and polishing the main surface with a brush to obtain a polished surface can be achieved at low cost. It provides a method for curved chamfering and finishing of the external shape of glass parts.

[For production]

The first feature of the present invention is the action of the grinding wheel, and the second feature is the action of the grinding wheel.
The feature of this method is that it uses brush polishing, which makes it possible to polish not only round but also polygonal glass parts with curved surfaces with stable precision.

C Embodiment] An embodiment of the present invention will be specifically described with reference to FIGS. 1 and 2.

Figures 1 to (E) are cross-sectional views sequentially showing the processing method of the present invention, and a sapphire cover glass for a wristwatch will be explained as a glass component 1 as an example of a workpiece. The glass component 1 in the same figure ((A) is positioned and rotated by a cam mechanism not shown.A grinding wheel 2 shown in the same figure (B) is rotated as shown by the arrow C on its outer periphery 11. Nakara arrow d
Press it in the direction of .

The Guyamont' grinding part 2' of this grinding wheel 2 has a curved chamfered part 12 and a grinding surface of an outline part 13, and as a result,
As shown in FIG. 3C, a curved chamfer 1# and an external chamfer 1' are formed over the entire circumference.

In this grinding process, the relationship between the glass component 1 and the spindle of the grinding wheel 2 is made to be interlocked by means of an NC or copying cam. Therefore, the controlled movement allows grinding even irregular shapes such as polygons.

Next, the polishing finish of the curved chamfered portion 1'' will be explained (see the same figure). A large number of glass parts 1 are fixed to the workpiece plate 5 with adhesive. At this time, the main surfaces ground in the previous process are facing up. , a brush 4 is placed against this surface, and the work plate 5 and the brush stand 3 rotate in opposite directions while injecting an abrasive 6 between them.At this time, the brush stand 3 is subjected to pressure F. The curved chamfer is polished by the applied frictional force.As shown in detail in the enlarged figure (e), the flexibility of the brush 4 allows the curved chamfer to be uniformly polished by 62 WF. .

Glass part 1 is the work! ! A large number of brushes 4 are fixed to the brush base 15 with adhesive, and are evenly embedded in the brush stand 3, so that the polishing action can be appropriately controlled by adjusting the rotational speed and pressing force.

By the above polishing process, the previously ground surface is polished to a perfect cast surface, and the curved surface and transparency of the glass component 1 are both finished in high quality.

Here, the materials used for the above-mentioned grinding and polishing will be explained.

The material for the grinding wheel is preferably a metal diamond wheel made by sintering metal and diamond powder, or an electrodeposited diamond wheel made by laminating diamond powder on a metal base using a plating method. This is a fine powder diluted with polishing oil.

Next, the shapes of glass parts that can be achieved by the method of the present invention can be various shapes as illustrated in the plan views of Fig. 2 ((a) to (c)). Even if the shapes of glass parts are slightly different, they can be fixed to the same workpiece and a large number of glass parts can be polished at the same time.

C. Effects of the invention] As described above, the method of the present invention can meet various design requests and can finish a large number of workpieces to the same quality, compared to conventional methods.
Moreover, it is mass-producible. As a result, many effects can be obtained, such as the ability to manufacture glass parts with curved chamfers at low cost.

[Brief explanation of the drawing]

Figure 1-(e) are cross-sectional views showing the processing order of the present invention. FIGS. 2A to 2B are plan views of shapes to which the processing method of the present invention is applied. FIGS. 3A to 3C are cross-sectional views showing the conventional processing order.・Glass parts ・Grinding whetstone ・Brush stand ・Brush bristle tip ・Work board ・Abrasive ・Puff ・Chuck Applicant Seiko Electronic Components Co., Ltd. Representative Patent attorney Keinosuke Hayashi (d) Shiko No. 2 (b) ~ ( e)

Claims (1)

[Claims] A method of shaping and polishing the outer shape and curved main surface of a plate-shaped glass part, which includes a step of simultaneously grinding and shaping the outer shape and curved chamfer with a grinding wheel equipped with a curved chamfer, and the shaped glass A method for processing a curved surface of a glass component, which comprises fixing the component on a polishing plate with its main surface facing up, and polishing the main surface with a brush to obtain a polished surface.