JPS5811109A - Manufacture of ceramic plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a ceramic plate, and more particularly, to an improvement in the process of cutting or grooving a green sheet into a predetermined shape before firing, and then firing it to finish it into a ceramic plate. .

Ceramic plates, which have been increasingly used as circuit boards for electronic devices in recent years, are created by firing ceramic sheets called green sheets.

There are two methods for forming green sheets: a powder press method and a doctor blade method. Of these, the doctor blade method is said to be the superior method from an engineering standpoint. The reason for this is that with the powder press method, it is difficult to apply pressure uniformly and the density of the green sheet is relatively small and uneven, whereas with the doctor blade method, a uniform, high-density green sheet is obtained. Furthermore, it has the advantage of being uniform in thickness and easy to handle. For this reason, processing steps such as cutting, drilling, punching, etc. on a green sheet formed by the doctor blade method and then firing the green sheet can be easily carried out.

By the way, presses have been frequently used as a method for processing green sheets.

That is, when cutting, punching, drilling, grooving, etc., processing was performed using a press mold formed into a predetermined shape. However, when using a press, for example, if you want to make a prototype of a certain shape, you have to create a press mold of that shape, so it takes many days to manufacture the press mold, and the cost of the mold is high. Currently, there are several drawbacks, such as the fact that rapid treatment and shape changes cannot be easily implemented. Another disadvantage is that, as mentioned above in the green sheet production method, it is difficult to apply pressure uniformly during press processing, and the processed edges in particular are subject to large compression, resulting in a processed damaged layer remaining over a wide range. Even if the green sheet is formed uniformly, the density of the shaped sheet will be uneven, and as a result, when it shrinks during firing, the shrinkage rate will differ depending on each part, resulting in cracks, bends, or problems after firing. The dimensions become uneven, −
This also created an unfavorable situation from a product management standpoint.

The present invention has been made in view of these current circumstances, and
By using high-pressure fluid jets when processing green sheets, it is possible to prevent stress and uneven density from occurring due to processing, and also to be able to quickly and easily respond to changes in shape. Before firing, the so-called green sheet is flexible, and such flexible members can be easily cut using conventionally known high-pressure fluid jets.

The pressure of the fluid used for cutting is from LOOOkgfA7n to 5.000 kg:f4n', which is sufficient for practical use and allows extremely effective cutting. During cutting, the cutting stress acts only on the tiny part of the cutting point and has almost no effect on other parts, so there is no process-altered layer and the uniform density distribution of the green sheet is maintained as it is. Shrinkage becomes uniform and irregular deformation does not occur, improving the yield of the product after firing.Since the shrinkage rate due to firing is still constant, the dimensions of the product after firing can be calculated at the time of cutting. Easy to manage.

This processing method can be effectively used not only for cutting but also for grooving called snap processing. Traditionally, presses and rollers have been used in this snap processing, and as with cutting, a damaged layer spreads over a wide area around the processed area, and this appears as an uneven shrinkage rate during firing, resulting in deformation and dimensional changes. However, by using high-pressure fluid injection, it becomes possible to adjust the depth of snap machining by adjusting the fluid pressure.

The fluid pressure used for snap processing is 500 kgf/
It is practical at a rate of 1.0 to 1.0001 cgf/an, and is set depending on the machining depth, material dimensions, and machining speed.When snap machining is performed using high-pressure fluid, the process-altered layer is extremely small, similar to cutting machining. This is only a small range and can be ignored in the firing process, making it possible to obtain a product with extremely high precision.These are the advantages from the viewpoint of shape and quality.

Another advantage is that changes in processing dimensions can be easily accommodated in a short time. Not only linear cutting but also shape cutting can be achieved by using the NO control device or optical copying device as a control device and working in conjunction with the high-pressure fluid injection device.

If you prepare a tape or even a drawing for optical tracing and incorporate it into these control devices, you can process it into the desired shape. For this reason, it is an extremely effective method not only for application to production lines but also for changing shapes and dimensions during the trial production stage. Further, according to the processing method of the present invention, it is possible to stack and cut a plurality of green sheets, and it is effective when applied to a production line.

As detailed above, according to the method of the present invention, compared to the conventional pressing method (5), it is possible to respond more quickly to changes in shape and dimensions, resulting in less time loss and lower costs. Because the shrinkage during firing is small and the shrinkage is uniform, there is less chance of deformed or unevenly dimensioned products, which greatly improves the yield, and it is efficient because multiple sheets can be stacked and cut. This method has the advantage of being able to perform snap processing simply by changing the fluid pressure, and greatly contributes to improving the quality of ceramic plates.

patent applicant Sugitsu Machine Co., Ltd. (6)

Claims (1)

[Claims] A method for producing a ceramic plate, which comprises cutting or grooving a pre-fired ceramic tape or ceramic sheet using a high-pressure fluid jet and then firing it to obtain a desired ceramic plate.