JPS6087009A - Dry cutting method for ceramic molded bodies - 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 Field of Industrial Application The present invention relates to a dry cutting method for ceramic molded bodies of ceramic products used in various electronic devices, automobiles, and the like.

Conventional configurations and their problems In recent years, along with the development of the electronics, automobile, and energy industries, ceramic products have also undergone remarkable development due to their various electrical and mechanical properties. For molding this ceramic product, extrusion molding (1), which has been conventionally used for metal and plastic materials, yields a homogeneous molded body.

(2) No harmful dust is generated during molding.

(3) High moldability.

It is widely used for these reasons.

However, the extruded molded product contains 10 to 30% by weight (hereinafter referred to as wt%) of water, and in the case of a hollow molded product, drying and cutting of the molded product are particularly important steps. .

In other words, when using the conventional method of placing a hollow molded body created by extrusion on a belt conveyor or the like and drying it with hot air or a heater, there is a difference in the rate of moisture evaporation between the inner and outer surfaces of the hollow molded body. The problem was that it deformed during drying. By the way, there was a subsequent report that the deformed inside of the molding was inconvenient in that even if the deformation was corrected, it would deform again during firing. This means that generally extruded ceramic molded bodies mainly consist of a binder such as methyl cellulose, a wetting agent such as glycerin, water and ceramic powder, and have plasticity, but when they lose water during drying, they become plastic. It is thought that a habit of deformation called the memory phenomenon has developed, and it is difficult to remove it.

In addition, when cutting a semi-dried or completely dry molded body into individual products, a method in which a metal blade is pressed in one direction deforms and distorts the area around the cut part, causing cracks during firing. There was a problem.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a method for drying and cutting ceramic molded bodies, which prevents deformation and cracking during drying and cutting, and which makes it possible to obtain good hollow ceramic products.

Structure of the Invention In order to achieve the above-mentioned object, the present invention inserts a hollow hot air blower tube for drying having pores similar in shape to the molded body into the hollow part of an extrusion-molded hollow ceramic molded body. After simultaneously drying the inner and outer surfaces, the high-tensile steel wire is pressed and cut while simultaneously rotating the drying side hot air blower tube and the ceramic/plastic molded body.
It has the unique effect of making it possible to obtain good hollow ceramic products without causing deformation, distortion, cracking or cracking during drying and cutting.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Semiconductive barium titanate having an average particle size of 1.4 μm and the following composition was used as a ceramic raw material.

(13a o, 7B Pbo, 2□) Tl 1. Q
20! ,04 +0-001ONb20゜10.002
8in2 +0.0006 MnO2 Next, a) Ceramic raw material 1o b) Methyl cellulose 340y.

C) Glycerin 46o1' a) Pure water 2.11 The mixture was blended and kneaded to produce a clay for press molding. This clay was extruded into a cylindrical ceramic molded body 2 having an outer diameter of 40 mm and a wall thickness of 3.511 m using an extrusion molding apparatus 1 shown in FIG. FIG. 2 shows a drying hot air blower 3 having a similar shape to the ceramic molded body 2 for drying the ceramic molded body 2 produced by extrusion molding. In order to effectively disperse moisture, the drying hot air blower 3 is
It has a hole 4 and a cutting gap 6.

Next, as shown in FIG. 3, the ceramic molded body 2 is attached to the hot air blower tube 3 for drying shown in FIG. Then, the outer surface of the ceramic molded body 2 was heated with dry air W2 at 130°C at 1 m/s+a.
It was dried for 10 hours.

After drying, as shown in FIG. 4, the ceramic 2 molded body 2 was rotated together with the drying hot air blower 3 at 28 Or, p, m, and a high-tensile steel wire 6 with a diameter of 0.5 ffM was continuously pressed. The sample was cut from the sample and baked at 1300°C for 1 hour.

As a result, a good ceramic fired body could be obtained without cracking, cracking, or deformation during drying and cutting. A hollow drying hot air blower with porous holes is inserted into the hollow part of the body, and after drying, the high tensile steel wire is pressed and cut while rotating the drying hot air blower and the ceramic molded body. , without deformation, distortion, or cracking.
Extrusion molding produces a good hollow ceramic material, and its practical effects are impressive.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing extrusion molding, Fig. 2 is a perspective view showing a drying cylinder, Fig. 3 is a cross-sectional view showing the drying method according to the present invention, and Fig. 4 is a partial cross-section showing the cutting method according to the present invention. It is a diagram. 1... Extrusion molding machine, 2... Ceramic molded body, 3... Warm air blower for drying, 4...
...Vacancy, 5...Void for cutting, 6...
High tensile steel wire.

Claims (1)

[Claims] A hollow drying hot air blower having pores similar in shape to the ceramic molded body is inserted into the hollow part of the extruded hollow ceramic molded body, and the molded body is simultaneously dried from the inner and outer surfaces. A method for drying and cutting a ceramic molded body, which includes pressing and cutting a high-tensile steel wire while simultaneously rotating a drying hot air blower and a ceramic molded body.