JPH0829541B2 - Manufacturing method of ceramic substrate - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for processing a ceramic green sheet, and particularly in the production of a ceramic substrate, bending is further performed after scribing to improve the crackability of the ceramic fired body. The present invention relates to a method for manufacturing a ceramic substrate.

[Prior Art] Conventionally, in a ceramic product, particularly a ceramic substrate subjected to scribing, a manufactured green sheet is scribed vertically and horizontally by a press die and fired to manufacture a fired product. Scribing of such a ceramic substrate is performed by forming grooves on the surface of the green sheet in the vertical and horizontal directions by pressing with a die by a pressing machine at the stage of the green sheet. In this grooving, grooving blades (longitudinal blades, horizontal blades) with a die in consideration of the workability of the green sheet.
The height or angle must be designed appropriately. Also, considering the breakability when firing the ceramic fired body,
It is necessary to change the vertical and horizontal scribe groove depths to ensure the ease of cracking during division.

In order to secure the vertical and horizontal crackability of this fired product, the design of the blade of the die must be performed in consideration of the workability of the green sheet, which is extremely difficult. If the mold design is incorrect, the required groove depth cannot be secured,
Since the ratio of the depths of the vertical and horizontal grooves cannot be adjusted, appropriate crackability cannot be secured.

Also, if the green sheet is processed more than necessary,
Stress strain such as processing strain remains on the green sheet, which causes deformation and cracking during firing. Further, in the conventional scribing process, the die wear is severe and the durability of the die is problematic. Therefore, in the conventional method, if the die design is wrong, it is difficult to adjust the scribing depth, and it is difficult to perform appropriate scribing. Further, if strong working is performed, the die is consumed and damaged significantly, which is very disadvantageous in terms of economy.

[Problems to be Solved by the Invention] The present invention provides a scribing method for a green sheet capable of arbitrarily controlling the vertical and horizontal groove depths in such scribing without depending on a die press. The purpose is to do. A further object of the present invention is to provide a method for scribing a ceramic green sheet that can reduce the residual strain such as processing strain on the green sheet and reduce the deformation during firing. Another object of the present invention is to provide a scribing method for a ceramic green sheet, which is capable of reducing wear and the like by using a die press as a preliminary processing step for groove processing.

[Structure of the Invention] [Means for Solving the Problems] Here, the gist of the present invention is that a ceramic green sheet is grooved by a die press, scribed, and fired. , In the method for manufacturing a ceramic substrate; a green sheet having scribed grooves is bent by passing it between rollers to cause vertical cracking from the bottom of the grooves on the surface of the ceramic green sheet, and to prevent vertical cracking. This is a method for manufacturing a ceramic substrate, which is characterized by ensuring. And the depth of the scribe groove to be formed is the same as the thickness of the green sheet.
It should be in the range of 1/10 to 1/5.

[Operation] According to the present invention, the ceramic green sheet having the scribe grooves formed by passing between the rollers is bent to introduce cracks from the bottom of the scribe grooves to ensure the crackability of the green sheet.

In the method of manufacturing a ceramic substrate, scribing is performed to form scribed grooves in the vertical and horizontal directions, and a ceramic green sheet is divided into a large number of ceramic substrates, which are individually manufactured into ceramic substrate products. For such scribing, conventionally, scribe lines have been formed vertically and horizontally on a ceramic green sheet by pressing with a die press, but in such groove processing, the cutting edge of the die is , It has a sharp angle and is easily worn. Also, when the fired ceramic substrate is divided vertically and horizontally, it must be cracked in which direction first. Cracks in both directions must be easier for one to crack than the other.

That is, it is necessary to change the vertical and horizontal scribe depths.
In that case, it is necessary to design a die in which the height of the scribe edge of the press die is changed. However, in order to perform this design properly, it is necessary to make an appropriate mold by trial and error.

When a green sheet having grooves formed by the scribing process according to the present invention is passed between rollers and a bending stress is applied to the green sheets, a force is applied to widen the formed grooves, and a crack is further generated from the bottom thereof. . The bending stress can be adjusted in length or depth by adjusting the degree thereof. Further, the processing of the scribe-processed green sheet according to the present invention as described above is performed continuously, and the green sheet can be processed efficiently. Further, the treatment method of the present invention results in further expanding the formed scribe groove, which can improve the crackability (breakability) of the green sheet, and makes the production of a ceramic substrate by scribe processing more efficient. become.

Further, in the scribing process using the mold according to the present invention, since a crack can be introduced into the scribing groove later, the pressure of the press mold requires less pressure, resulting in less wear of the mold. There is something.

The scribing process according to the present invention can be performed by a die press, but the depth of the scribing groove formed can be shallower than that conventionally performed. That is, the depth of the conventional scribe groove is about 1/6 to 1/2 of the thickness of the green sheet.
However, in the scribing method according to the present invention, the depth of the scribe groove may be about 1/10 to 1/5 of the thickness of the green sheet. This is because the bending process according to the present invention is performed later to further expand the scribe groove and ensure the cracking property. If the depth of the scribe groove is about 1/10 or less of that of the green sheet, even the processing method according to the present invention cannot cause cracks from the bottom of the groove. Further, if the groove is formed in about 1/5 or more, it is not suitable for the processing method of the present invention.

[Example] FIG. 1 shows an apparatus in which a bending stress is further applied to a ceramic green sheet having scribed grooves according to the present invention.

The endless belt 7 is hung on the pressing roller 1, and the endless belt 5 is also hung on the lower receiving rollers 2 and 3, and the green sheet 6 having the scribed grooves is attached to the endless belt 5. It is placed as shown, passed between rollers and subjected to bending stress. The magnitude of the applied bending stress can be adjusted by the diameter of the roller 1 and the distance between the rollers 2 and 3. That is, the bending angle of the green sheet is determined, and the applied force can be adjusted by adjusting the magnitude of the stress applied to the green sheet of the roller 1, that is, the adjustment of the spring 4.

According to the method of the present invention, the green sheet 6 is placed on the belt 5 and passes between the roller 1 and the rollers 2 and 3,
In the meantime, a predetermined stress and bending angle are applied. A crack is introduced into the bottom of the scribe groove of the green sheet due to this predetermined bending stress. It substantially deepens the scribe groove.

If the diameter of the roller 1 is reduced or the distance between the rollers 2 and 3 is reduced, the bending stress increases and the treatment according to the present invention is strengthened. Further, when the spring 4 applied to the roller 1 is adjusted and a strong force is applied to the roller 1, the process according to the present invention becomes strong, that is, the bending stress can be further increased.

Although the shape of the ceramic green sheet and the arrangement of the ceramic substrate are not particularly limited, the processing is easier, the shape and the arrangement are good so that defective products are not generated, and the scribe processing is performed uniformly. Further, a device having a shape and arrangement in which extra stress is not applied to the ceramic substrate and distortion is less likely to occur is suitable.

[Effects of the Invention] The following technical effects can be obtained by the method for manufacturing a ceramic substrate by further bending the scribe-processed ceramic green sheet according to the present invention.

First, in die pressing for scribing a green sheet, the groove can be formed with a shallow depth, die wear can be reduced, and the life of the green sheet can be extended. To provide a method for manufacturing a ceramic substrate by processing, and secondly, to provide a method for scribing a ceramic green sheet that can reduce damage to the ceramic substrate due to die processing of the green sheet, and thirdly. According to the present invention, a method of bending a ceramic green sheet having scribed grooves and easily adjusting the depth of the introduced crack depending on the degree of the processing is provided. Fourth, further, the ceramic green sheet Scribing method for ceramic green sheets that can continuously introduce cracks when processing Technical advantages, such as that could be provided was obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a belt and roller device for further bending a ceramic green sheet having scribed grooves according to the present invention. [Explanation of symbols for main parts] 1,2,3 …… Roller 4 …… Adjusting spring 5,7 …… Endless belt 6 …… Ceramic green sheet

Claims (2)

[Claims] 1. A method for producing a ceramic substrate by grooving a ceramic green sheet with a die press, scribing, and then firing the green sheet having scribed grooves formed between rollers. By doing so, bending is performed and vertical cracks are generated from the bottom of the groove on the surface of the ceramic green sheet,
A method of manufacturing the ceramic substrate, characterized by ensuring vertical cracking properties. 2. The ceramic substrate according to claim 1, wherein the depth of the scribed groove formed is in the range of 1/10 to 1/5 of the thickness of the green sheet. Production method.