JPH02171211A - Cutter of green sheet - Google Patents

Abstract

PURPOSE:To make a change in cutting dimensions easy, by a method wherein the title cutter is provided with a rotary table capable of turning by fixing a green sheet, an ultrasonic cutter for cutting-off of the green sheet and a moving device moving the ultrasonic cutter. CONSTITUTION:An ultrasonic cutter 3 is positioned at a fixed position by lowering the same, a rotary table 2 is turned by 360 deg. and the edge 10 of a blade of the same cuts off a circular sheet C. With this construction, the green sheet C can be cut into fixed dimensions freely and easily and a cutter of a green sheet C suitable for small quantity production of various kinds can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an apparatus for cutting alumina green sheets or the like into circular shapes or the like.

Prior Art To cut a green sheet into a circular shape (the same applies to other circular shapes), press punching is performed using a die. For sizes exceeding 150 mm in diameter, since there is no suitable equipment, a circular template is applied to the green sheet and cut manually using an ordinary cutter.

Problems to be Solved by the Invention In the punching method, the cut portion is compressed, resulting in the generation of chips and chips. Therefore, the cut surface will not be smooth.

Furthermore, punching out large disks using a press is disadvantageous for high-mix, low-volume production because the press machine becomes larger and the mold cost increases. Moreover, if the thickness of the green sheet is 2 mm or more, cracks and chips will occur on the cut surface, and the product will not be produced.

OBJECTS OF THE INVENTION It is an object of the invention to provide a green sheet cutting device that can freely and easily cut green sheets into predetermined sizes and is suitable for high-mix, low-volume production.

Summary of the Invention The gist of the present invention is a green sheet cutting device as claimed in the claims.

Means for solving the problem will be explained using the embodiment shown in FIG. In this embodiment, the green sheet G is cut into circular shapes.

The rotary table 2 can rotate while fixing the green sheet G.

The ultrasonic cutter 3 cuts the green sheet G or the green sheet in a stopped state.

The moving means 4 moves the ultrasonic cutter 3 relative to the green sheet G to cut the green sheet G into, for example, a circular shape.

Operation: For example, the ultrasonic cutter 3 is moved to a predetermined position by the moving means 4. For example, a circular green sheet piece having a predetermined diameter is cut into a green sheet G by an ultrasonic cutter 3.
disconnect from.

Embodiment The green sheet cutting device shown in FIG. 1 is of a numerical control type, and includes a frame 1, a rotary table 2, an ultrasonic cutter 3, a moving means 4 as a means for changing cutting dimensions, a rotary table drive unit 5, It has a vacuum pump 6.

For example, the green sheet is alumina green sheet G.
It is fixed on the rotary table 2 by adsorption. This adsorption is performed by operating the vacuum pump 6.

The rotary table 2 is provided on the frame 1 and is rotatable by a drive section 5. The ultrasonic cutter 3 is set on a moving table 7 of a moving means 4. This movable table 7 can be horizontally moved along rails 8 by a drive device (not shown) and can be fixed at a predetermined position. The rails 8 preferably run along the diameter of the rotary table 2. Ultrasonic cutter 3
The blade edge 9 can be positioned and moved up and down by operating the air cylinder 9. The ultrasonic cutter 3 is usually capable of cutting various difficult-to-cut items such as rubber, sponge, cake, etc.

The ultrasonic cutter 3 is lowered and positioned at a predetermined position, the rotary table 2 is rotated 360 degrees, and the cutting edge 10 of the ultrasonic cutter 3 cuts a circular sheet C as shown in FIG. The green sheet G is thicker than 2 mm (but can be cut).

[Comparative test] An alumina green sheet with a thickness of 2.8 mm was formed by extrusion molding, and then press punched, and the device of this invention was used to form an alumina green sheet with a diameter of 1 mm.
Cut into 22 mm discs.

Products cut using conventional press punching have chips and cracks on the cut surface, and cannot meet product specifications.

On the other hand, the cut surface of the product cut by the device of the present invention was smooth and met the product specifications.

An alumina green sheet with a thickness of 0.6 mm obtained by doctor blade molding was cut into discs with a diameter of 214 mm using the apparatus of the present invention. Previously, discs of this size were cut by hand using templates. Working efficiency was improved by using the device of this invention. In addition, because the resistance during cutting is lower than that of conventional cutters, the stress that the green sheet receives during cutting is small, which reduces the warpage of the outer circumference of the alumina disk after firing, and allows the green sheet to be rewarped and fired (with a weight placed on it). The number of products that undergo firing and creep deformation to unwarp the product was reduced by 35%.

The invention is not limited to the embodiments described above.

The durability of the ultrasonic cutter according to the present invention is improved by using zirconia ceramics or the like for the cutting edge.

For example, an example of creating a rectangular green sheet will be explained.

To enable a rotary table to be fixed after being rotated every 90 degrees. Then, the rail position can be moved in a direction perpendicular to the longitudinal direction of the rail. What's more, the ultrasonic waves allow the cutter's cutting edge to rotate 90 degrees.

Under this premise, the green sheet is cut by a predetermined length corresponding to the first side of the rectangle by moving the ultrasonic cutter along the rail. Next, after rotating the cutting edge of the cutter 900 times, the ultrasonic cutter is moved together with the rail in a direction perpendicular to the longitudinal direction of the rail. As a result, a predetermined length corresponding to the second side of the rectangle is cut using an ultrasonic cutter. You can also repeat the same process and cut from the first side to the fourth side to make a rectangular green sheet.

As described in detail, according to the present invention, the cutting dimensions can be easily changed by the moving means, making it suitable for high-mix, low-volume production.

Even in a thick sheet, for example, a green sheet with a thickness of 3+n+n, the cut surface is smooth and good. When cutting thin sheets (for example, 0.4 mm thick green sheets), ultrasonic cutters have low cutting resistance, so
The stress strain applied to the sheet has been reduced. Therefore, the deformation (warpage) of the product after firing was reduced. Therefore, the quality of the cut sheet can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a circular cutting device for a green sheet according to the present invention, and FIG. 2 is a diagram showing a state in which the green sheet is cut into circular shapes. G...Green sheet 2...Rotary table 3...Ultrasonic cutter 4...Cutting dimensions Change means-6:

Claims (1)

[Claims] A rotary table capable of fixing and rotating a green sheet, an ultrasonic cutter for cutting a rotating green sheet or a stopped green sheet, and an ultrasonic wave applied to a green sheet. A green sheet cutting device comprising a moving means for moving a cutter to cut the green sheet into a predetermined shape.