JPS60184978A - Manufacturing method of shoe for tilting compressor - Google Patents

Abstract

PURPOSE:To form uneven parts on a plating surface into smoothness as well as to prevent any lost motion due to the uneven parts from occurring, by forming a reverse concave part in one end of a cylindrical blank and, after the surface is plated, finishing the reserve concave part into a spherical concave part. CONSTITUTION:At the time of manufacturing, first of all, a reserve concave part 2 is formed in one end of a cylindrical blank 1, making it as a blank work 3. Next, a surface of the blank work 3 is plated with copper and, after a through hole 4 is made up by means of punching, the reserve concave part 2 machined into a spherical concave part 5 by means of press work, making it into a blank work 6. In succession, a chamfering part 8 is formed in an outer circumference of a slide surface 7 being slidden with a swash plate 12 of the blank work 6, while the slide surface 7 is ground and removed the copper plating. And, after heat hardening treatment and grinding take place on the slide surface 7, buffing is applied to the outer circumference of the slide surface 7 and then the slide surface 7 and the chamfering part 8 are continuously ranged with a smoothly curved surface 10. With this constitution, any lost motion due to uneven parts on the plating is prevented from occurring.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method of manufacturing a shoe for a swash plate compressor.
More specifically, the present invention relates to a method of manufacturing a shoe having a spherical concave portion on one end of which a spherical surface slides, and a sliding surface on the other end of which a swash plate slides.

[Prior Art] A swash plate compressor includes a swash plate that is rotated by a rotating shaft within a cylinder block and a piston that is fitted within the cylinder block, and the rotation of the swash plate causes the piston to reciprocate. be. Conventionally, a shoe and a pawl have been used to interlock the swash plate and the piston, and one end of the shoe is in sliding contact with the swash plate, and a spherical recess formed at the other end of the shoe and a pawl formed on the piston. The swash plate and the piston are interlocked by interposing a pawl between the spherical concave portion and the spherical concave portion.

[Problem to be Solved by the Invention 1] By the way, in order to smooth the sliding movement between the spherical recess and the pole that slides thereon, at least the spherical recess is plated with copper or the like. Sometimes,
When plating is performed after forming a spherical recess, slight irregularities in the plating are later smoothed out by the poles that are incorporated into the swash plate compressor, resulting in looseness. When the backlash occurs, a hitting sound is generated, fatigue is caused, and in the worst case, seizure may occur.

[Means and effects for solving the problem] In view of such circumstances, the wooden invention forms a preliminary concave portion for forming the above-mentioned spherical concave portion at one end of the cylindrical material, and then at least the preliminary concave portion. The surface of the spherical recess is plated, and then a spherical member of a desired shape is pressed into contact with the preliminary recess to make the preliminary recess the spherical recess. By molding the parts, slight irregularities in the plating can be smoothed out before being assembled into the swash plate compressor, thereby making it possible to prevent the occurrence of the above-mentioned backlash.

[Example] The manufacturing method of the present invention will be explained below with reference to the illustrated example. In FIG. 1(a), first, a rod-shaped body (not shown) with a circular cross section is cut to a required length to manufacture a cylindrical material l. do. Next, as shown in FIG. 1(b), a preliminary concave portion 2 having a truncated conical shape or a slightly spherical shape is formed on one end surface of the material 1.
The material 3 is formed by cutting and/or forging.

This preliminary recess 2 is for facilitating the formation of a spherical recess described below.

Once the material 3 is manufactured, its surface is plated with copper to a thickness of 1 to 104 m, preferably 3 to 5 IL m, and then the material shown in Fig. 1 (C
), a through hole 4 having a substantially circular cross section is formed by punching, and then the preliminary recess 2 is formed into a spherical recess 5 by pressing.

The above-mentioned copper plating is particularly applied to smooth the sliding movement between the spherical recessed part 5 and the ball 20 (see Fig. 2) which is in sliding contact therewith. It may be. This type of plating needs to be applied before forming the spherical concave portion 5 by the above-mentioned press working, and by performing press working after plating, slight irregularities in the plating can be made smooth. become.

We manufactured shoes for cases in which press processing was applied after plating and cases in which plating was applied after press processing, respectively.
According to an experiment in which each type of compressor was assembled into a swash plate compressor and operated, no problems occurred in the former case, but in the latter case, there were slight warps that were thought to be caused by the unevenness of the plating. It has been confirmed that this may occur.

Next, as shown in FIG. 1(d), for the material 6 in which the 1-arrangement through hole 4 and the spherical concave portion 5 are formed, the outer periphery of the sliding surface 7 that comes into sliding contact with the peeled plate is chamfered. While forming part 8, 1. The contact surface 7 is ground and the copper coating normally applied to the contact surface 7 is removed. This peeling is done in order to more effectively apply the heat hardening treatment to the sliding surface 7 in the next step C.

1 J? ? After peeling off the copper plating applied to the joint 7, heat harden the I-J! , apply charcoal quenching.

This carburizing and quenching is performed, for example, by heating at 850 to 800°C for about 5 hours and then quenching.
This can be done by heating at 30 to 200°C for about 2 hours. In addition, other heat curing treatments include:
Treatments such as quenching, soft ticker treatment, etc. that are typically heated to 500'C or higher can be used.

-Jl After the heat hardening treatment is completed, the sliding surface 7 is subjected to grinding such as ramp processing to remove distortion of the sliding surface 7. After that, as shown in FIG. 1(e) with the - part enlarged, the outer circumference of the sliding surface 7 is puffed to make the sliding surface 7 and the chamfered portion 8 smooth. Continue on the curved surface lO.

This curved surface lO is continuous with the sliding surface 7 within a range of 2.5 mm or less, more preferably 2+*m or less from the outer circumference of the material 11, and forms an angle of 10 II or less with respect to the surface of the swash plate 12. It is preferable that the chamfered portion 8 be continuous with the chamfered portion 8 within a distance of no more than 5 pm from the surface of the swash plate 12.

The shoe 21 manufactured as described in 1- below is shown in Fig. tJS2,
As shown in FIG. 3, it has a sliding surface 22 that slides on the swash plate of the swash plate compressor, a spherical recess 23 that slides on the spherical surface of the pole 20, and a through hole 24. The pawl 20 comes into sliding contact with a spherical recess formed in the piston of a swash plate compressor (not shown).

Note that the spherical concave portion 23 is located between the pole 20 and the shaded portion 25.
It is designed to make sliding contact within the range of . Further, it goes without saying that the preliminary recessed portion 2 may have substantially the same shape as the spherical recessed portion 5.

[Effects of the Invention] As described above, in the present invention, the spherical concave portion is formed after plating, so that slight irregularities in the plating can be smoothed out before being incorporated into the swash plate type compressor 2. The effect is that the occurrence of backlash due to the unevenness can be prevented.

[Brief explanation of the drawing]

FIGS. 1(a) to (8) are explanatory diagrams for explaining one embodiment of the manufacturing process of the present invention, FIG. 2 is a sectional view of the shoe manufactured by the manufacturing process of FIG. 1, and FIG. FIG. 1...Cylindrical material 2...Preliminary concave portion 5.23...
・Spherical recessed part 12...Swash plate 20...Ball 21
...Shu22...Sliding surface area 1 (a) (b) (C) Fig. 2 422 (d) (e) No. 30

Claims (1)

[Claims] A method for manufacturing a shoe having a spherical concave portion on one end of which a spherical surface slides, and a sliding surface on the other end of which a swash plate slides, the method comprising forming the spherical concave portion on one end of a cylindrical material. After forming the preliminary concave portion, at least the surface of the preliminary concave portion is plated, and then a spherical member having a desired shape is pressed against the preliminary concave portion to form the preliminary concave portion as the spherical concave portion. A method for manufacturing a shoe for a swash plate compressor, characterized by: