JPH01113163A - Production of sliding part - Google Patents

Abstract

PURPOSE:To form a sliding part optionally set volumetric containing ratio of fiber or grain with squeeze casting by charging the fiber or the grain of ceramic, etc., into a vessel having plural small holes and impregnating molten Al alloy in the vessel from the small holes in the vessel and solidifying. CONSTITUTION:At first, a case 15 is set into a fixed metallic mold 11 and the carbon grain is packed in the case body and an upper cap 16 is covered on the case 15 while press-forming the carbon grain with a plunger 12. By this method, the carbon grain is formed into the shape forming the sliding part in the inner part of the vessel 14. Then, the plunger 12 is ascended and the molten Al alloy is poured from the pouring hole 13 of the fixed metallic mold 11 and after impregnating it into void among the carbon grains by pressurizing with the plunger 12 from the small holes 17 of the vessel 14, it is solidified to form a billet of the composite material. This billet is taken off from the vessel 14 and surface-ground to complete as the sliding part.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a method for manufacturing sliding parts of compressors used in air conditioning equipment, refrigeration equipment, etc.

(B) Prior art As shown in FIGS. 7 and 8, a conventional compressor has a rotary shaft 51 rotatably held in a cylinder 50, and a roller 53 is fitted around an eccentric portion 52 of the rotary shaft 51. It's matching. A vane 55, which is elastically held by a spring 54 on the cylinder 50, is in contact with the roller 53.

When the rotating shaft 5i is rotated by an electric element (not shown), the roller 53 rotates along the inner wall of the cylinder 50, sucks gas such as refrigerant into the cylinder 50 from the suction port 56, compresses it, and discharges the gas from the discharge port 57. It is discharged from While the roller 53 is rotating, the tip of the vane 55 is pressed against the surface of the roller 53 by the elastic force of the spring 54, and the interior of the cylinder 50 is divided into a suction side and a discharge side.

(c) Problems to be solved by the invention However, in conventional compressors, the rollers 53, vanes 55, etc. are made of heavy iron-based materials, which increases the weight of the entire device into which they are incorporated. In addition, with the advancement of technology, the adoption of inverter systems has required the roller 53 to rotate at high speeds, and when the roller 53 is made of iron-based material, the bearing caused by the rotation of this roller during high speed rotation is It is becoming impossible to cope with the increase in load.

Therefore, it has been proposed to make rollers and vanes using aluminum alloys and titanium alloys that have low specific gravity and wear resistance (for example, Japanese Patent Laid-Open No. 61-155
(See Publication No. 687). Rollers and vanes made of these lightweight, wear-resistant metals are advantageous in terms of reduced inertia during rotation and vane followability, but their coefficient of linear expansion is larger than that of steel, so they are less sensitive to temperature changes. On the other hand, the gap between the cylinder and the sliding part made of iron-based materials tends to change, which not only poses a risk of gas leakage, but also does not necessarily provide sufficient wear resistance compared to iron-based materials.

This invention solves the above-mentioned problems by reducing the inertial force during rotation of rollers and vanes due to the inherent lightness of aluminum-based metals, and by using fibers and aggregates that cannot have a high volume content such as ceramics and carbon. The purpose of this method is to allow molten aluminum-based metal to impregnate and solidify particles that are difficult to form into a preform by applying pressure without reducing the volume content of ceramics, carbon, etc.

(d) Means for Solving the Problems This invention involves putting M fibers or particles of ceramic, carbon, etc. into a container with a plurality of small holes, and after setting this container in a forging machine, aluminum alloy Sliding parts are manufactured by pressurizing molten metal and allowing it to impregnate and solidify into the container through small holes in the container.

(*〉Operation) By having the above-described structure, this invention allows fibers whose volume content cannot be increased or particles which cannot be aggregated to form a preform to be placed in a container, and the 1a7a in this container.
The volume of ceramic or carbon fibers or particles is made so that molten aluminum alloy can be impregnated into the aluminum alloy particles under pressure, and the mechanical strength and wear resistance of the aluminum alloy as well as the coefficient of linear expansion between the iron-based material and the track. This makes it possible to manufacture sliding parts using a molten metal forging method using materials that are difficult to set the content of or form into preforms.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 to 6.

1 is a compressor, and this compressor includes a cylinder 2, a roller 5 that rotates inside the cylinder 2 by an eccentric portion 4 of a rotating shaft 3,
A high pressure chamber 6 and a low pressure chamber 7 are connected to the cylinder 2 in contact with this roller.
It is composed of a vane 8 that divides the cylinder 2 into two parts, and an upper bearing part 9 and a lower bearing part 10 that seal the opening of the cylinder 2 and pivotally support the one-rotation shaft 3. An electric motor (not shown) for driving the compressor 1 is attached to one end of the rotating shaft 3.

Reference numeral 10 denotes a forging machine, and this forging machine is made up of a fixed mold 11 in which materials are set and stored, and a plunger 12 that slides inside the fixed mold. The fixed mold 11 is provided with an injection port 13 for injecting molten aluminum alloy. Reference numeral 14 denotes an iron container filled with fibers or particles of ceramic, carbon, etc., and this container includes a case body 15,
It is formed with an upper lid body 16. The container 14 is provided with a plurality of small holes 17 through which molten metal and gas pass. The inside of the container 14 is formed into a shape in which sliding parts such as the rollers 5 and vanes 8 can be formed.

In the manufacturing method of the sliding part configured as described above, the manufacturing order of the sliding part of the vane 8 is explained. First, the case body 15 is set in the fixed mold 11, and carbon particles are filled into the case body. The upper lid body 16 is placed on the case body 15 while press-molding carbon particles with the plunger 12. Therefore, the carbon particles are
It is formed into a shape that molds sliding parts inside.

Then, the plunger 12 is raised to completely inject the molten aluminum alloy from the injection port 13 of the fixed mold 11, and after being pressurized by the plunger 12 and impregnated between the carbon particles through the small hole 17 of the container 14, it solidifies. to form a composite billet. This billet is taken out from the container 14,
Heat treatment is applied to remove distortion to relieve stress during molten metal forging. The billet is then cut into vane 8 shapes. The surface of this vane is then polished to complete the sliding part.

Further, the roller 5 is also manufactured by a similar process.

The sliding parts of the rollers 5 and vanes 8 are manufactured by filling the container 14 with carbon particles, so that they can be formed by the molten metal forging method even when using carbon particles that are difficult to form into preforms.

Further, the sliding part is manufactured by filling the container 14 with carbon particles and using a molten metal forging method, thereby omitting the step of forming a preform with carbon particles.

By impregnating aluminum alloy with carbon particles, its mechanical strength and wear resistance can be improved, and its coefficient of linear expansion can be made to be on the same level as iron-based materials.

By filling the container 14 with ceramic fibers and carbon fibers whose volume content cannot be increased compared to the aluminum alloy, the gaps between the fibers can be increased, making it easier for the molten metal to penetrate during forging, and reducing the volume content. It can be set arbitrarily.

This invention uses the conventional molten metal forging method to manufacture sliding parts by filling a container 14 with ceramic, carbon, or other particles that are difficult to form into a preform, and ceramic, carbon, or other fibers whose volume content can be regulated. This makes it possible to use materials that were not previously available, and also allows the volume content of the reinforcing material of the aluminum alloy to be set arbitrarily.

(g) Effects of the Invention In the method for manufacturing sliding parts of this invention, fibers or particles of ceramic, carbon, etc. are placed in a container with a plurality of small holes, and after this container is set in a forging machine, an aluminum Sliding parts are formed by pressurizing molten alloy and impregnating it into the container through the small holes of the container and solidifying it. Therefore, fibers or particles of ceramic, carbon, etc. are placed in the container, and the outside of the container is Impregnated with molten aluminum alloy from
By manufacturing sliding parts by solidification, sliding parts with an arbitrary volume content can be formed by molten metal forging even if particles that are difficult to form into a preform or fibers whose volume content is regulated can be used. Furthermore, since the sliding parts are manufactured by placing the material in a container and forging it with molten metal, the need to form a preform of the material can be omitted, improving productivity.

[Brief explanation of the drawing]

1 to 6 show this invention, FIG. 1 is a sectional view of the compressor, FIG. 2 is a sectional view taken along the line A-A in FIG. 4 is a cross-sectional view showing a state in which the material filled in the container is press-formed with a lid; FIG. 5 is a cross-sectional view showing a state in which molten metal is injected into the forging machine. Fig. 6 is a sectional view showing a state in which the injected molten metal is impregnated into the container, Figs. 7 and 8 show conventional examples, Fig. 7 is a sectional view of the compressor, and Fig. 8 is the 7 It is a sectional view taken along the line BB in the figure. 5...Roller, 8...Vane, 10...
Forging machine, 11... Fixed mold, 12... Plunger, 14... Container, 17... Small hole.

Claims (1)

[Claims] 1. Fibers or particles of ceramic, carbon, etc. are placed in a container with multiple small holes, and after this container is set in a forging machine, molten aluminum alloy is pressurized and impregnated into the container through the small holes of the container. A method of manufacturing a sliding part, characterized in that the sliding part is formed by solidification.