JPH02127918A - Manufacture of plate-like inclining function material applying centrifugal casting method and unbending working method - Google Patents

Abstract

PURPOSE:To manufacture an inclining function material having an excellent characteristic with high productivity by manufacturing a pipe in which a composition ratio of ceramics and a metal is varied in the thickness direction of a pipe wall under an action of centrifugal force, cutting it, and thereafter, straightening it to a plate. CONSTITUTION:When a mixture 4 of a metallic molten metal and ceramics powder is supplied into a mold 1 for rotating around the axial center, a material of high specific gravity, and a material of low specific gravity collect on the outside peripheral surface side of a pipe, and the inside peripheral surface side of the pipe, respectively by an action of centrifugal force. Such a pipe having an inclining function in which a composition ratio of ceramics and a metal is varied continuously stepwise in the radial direction of the pipe is manufactured. Subsequently, a pipe 6 manufactured in such a way is cut along its longitudinal direction and divided equally into two to that which has a semicircular cross section, and thereafter, brought to unbending working by rolling forming by a continuous roll forming machine and formed like a plate. Accordingly, an inclining function material having an excellent characteristic can be manufactured with high productivity.

Description

[Detailed description of the invention] (a) Industrial application field This invention has functions such as heat resistance, corrosion resistance, and wear resistance, and is at the cutting edge of space, aviation, nuclear fusion, ocean development, electronics, etc. We are developing a plate manufacturing method for functionally graded materials, which are structural materials that can satisfy the functions required by the technology industry.

(b) Conventional technology The concept of functionally graded materials advances the idea of composite materials,
It is a structural material that has been proposed in recent years and is currently under development, and the combination ratio (composition) of ceramic and metal materials is gradually changed in the thickness direction.

It is a structural material that is rich in ceramics and has functions such as heat resistance, corrosion resistance, and wear resistance, and is rich in metals and has functions such as toughness, workability, and cooling ability. Therefore, the methods proposed so far for producing functionally graded materials include those based on powder metallurgy and attempts to utilize metallurgical phenomena such as vapor deposition, diffusion, decarburization, and deoxidation. be.

(c) Problems to be Solved by the Invention However, the powder metallurgy method has poor productivity and is expensive. In addition, methods that utilize phenomena such as vapor deposition, diffusion, decarburization, and deoxidation have poor productivity and are expensive.
There are many difficulties in making thick plates other than thin plates.

Centrifugal casting, which uses centrifugal force, is used in 2 examples of waterworks.

It is used to manufacture cast iron pipes for gas and caple.
At this time, centrifugal force is used to pressurize the casting and improve the material quality by separating impurities. Also.

Up until now, the technology was all about how to make tubes from plates, and the technology for making plates from tubes was a waste of thought.

The present invention achieves low cost, good productivity, and a slope in which the combination ratio (composition) of ceramics and metal gradually changes in the thickness direction from thin plate to thick plate, which is difficult to achieve with the methods devised up to now. The purpose is to manufacture functional materials.

(d) Means for solving the problem Using the centrifugal casting method, the difference in centrifugal force due to specific gravity is used to create a combination ratio of ceramics and metal from the outside of the tube to the inside.
A tube of a functionally graded material having a progressively varying composition (composition) is produced. In order to facilitate the subsequent bending process, this tube is cut in the longitudinal direction into a grooved member with an arcuate cross section having a circumferential length corresponding to the required plate width. This circular channel member (1
) After unbending using rolling with a continuous roll forming machine, or (2) sending and unbending using a four-roll bending roll machine, a strain relief operation is performed to produce a plate material. In this plastic working, hot, warm, and cold working temperatures are appropriately selected in consideration of the ductility of the functionally graded material.

(E) Action Rotate the mold at high speed to increase the difference in centrifugal force.
．． 6) and metal iron (specific gravity approximately 7.86), the high specific gravity tungsten carbide gathers on the outer surface of the tube, the low specific gravity iron gathers on the inner surface of the center tube, and the tungsten carbide is concentrated in the thickness direction. Tubes of functionally graded materials with progressively varying combination ratios can be produced.

A method for manufacturing a plate from a pipe made of a functionally graded material, (1)
In the plate manufacturing process by rolling using a continuous roll forming machine, as a two-arc cross-section channel material progresses between several stages of distantly edged rolls, it gradually forms at each stage as shown in Figure 1. Correct it to the correct plane. (2) In the plate making process using a four-roll bending roll machine with two movable rolls and two fixed rolls, the two movable rolls are arranged in an arcuate cross-section as shown in Figure 2. By moving it according to the radius of curvature, it is gradually flattened and finally corrected to the correct flat plate.

(f) Effects of the Invention As explained above, in the present invention, a tube made of a functionally gradient material manufactured by a centrifugal casting method that utilizes the difference in centrifugal force due to specific gravity is cut and then bent back nine times to form a plate. Therefore, (1) rolling forming using a continuous roll forming machine enables mass production.

(2) Feed and bend back processing using a 4-roll bending roll machine is suitable for small-scale production for special purposes.

It can also be applied to thick plates that cannot be formed by rolling.

[Brief explanation of the drawing]

The figure shows the bending process corresponding to the second embodiment of the plate manufacturing process of functionally graded material according to the present invention. FIG. 1 shows an example of rolling forming using a continuous roll forming machine. Here, the number of roll stands is four. The upper figure shows how a tube divided into two parts in the longitudinal direction is continuously formed into a flat plate, and the lower figure shows the shape of the roll groove at the center cross-section of the corresponding roll and how it is rolled. It shows the cross-sectional shape of the functionally graded material (the blacked out part). FIG. 2 shows an example of forming using a four-roll bending roll machine. Two rolls, A and B, are movable rolls, and two rolls, C and D, are fixed rolls. The early stage is shown by a dotted line, and the middle stage is shown by a dashed line. Roll B is rolled down in the moving direction, and roll A is raised in the moving direction accordingly, so that the plate finally becomes a flat plate as shown by the solid line.The relationship between this aspect and the change in cross-sectional shape is shown below. ing.

Claims (1)

[Claims] It is characterized by manufacturing plates of functionally graded materials by combining the principle of centrifugal casting, which manufactures pipes by utilizing the difference in centrifugal force due to specific gravity, and the principle of unbending processing in plastic working. After manufacturing the functionally graded material tube,
This pipe is cut in the longitudinal direction, and then (1) bent back using rolling forming using a continuous roll forming machine, or (2) 4
A method of manufacturing a plate material of a functionally gradient material by applying forward bending and unbending processing using this roll-type bending roll machine.