JPS5834229A - Manufacturing method of bearing - Google Patents

Abstract

PURPOSE:To give advantages of well maintaining and stabilizing of a solid- lubricating workpieces in an oilless bearing which has the body partially exposed to a frictional face by casting metal around a sand mold as a core mold which has said workpieces inserted into the holes on the periphery. CONSTITUTION:Semicylindrical split molds 4 which have many radially arranged pores 5 and mold pins 6 of which each consists of a trunk part 6a capable of being inserted into each hole 5 and a locking head part 6b are prepared befor manufacturing. The split molds 4 are oppositely fit and fastened with fastening rings 7 and after shell sand 8 is filled into the split mold 4, the split molds 4 and the mold pins 6 are removed. A sand mold 8 which has many holes 9 on the peripheral face is thus completed. With solid-lubricating workpieces 3 of graphite pun into said holes 9, the sand mold 8 is disposed in an outer mold 10. By pouring a metal 12 casted from a gate 11 therebetween a compound body of the workpieces 3 and the metal 12 casted is shaped. The compound body is subjected to a mechanical work to form internal and external surfaces suitable for a finished bearing.

Description

[Detailed description of the invention] In the present invention, a solid lubricated molded body is cast into metal.

This sliding MVC relates to an oil-type bearing in which the above-mentioned molded body is partially exposed.

In the past, a number of methods have been devised for providing an E-body clear molded body on the sliding surface of a metal bearing, but the main methods include the following two methods.

(1) A method in which a large number of holes are formed by machining in a hollow cylindrical metal that is the bearing base, and the holes are filled with a solid lubricant molded body.

(2) A large number of II body lubricated molded bodies (for example, heat-resistant material such as graphite) are arranged in a cylindrical O#, or a large number of protrusions are formed on the outer peripheral surface by machining in advance. A method for producing round bearings in which the solid lubricated molded body is retained within the metal surface by casting the ring bearing metal using the nine-piece lubricated molded body as a core and then removing these marks.

Of the above methods, the former method has been widely used in the past, but when this bearing is used at high temperatures, the solid lubricated molded body and the metal bearing base undergo thermal expansion, causing the molded body to move away from the base. There were defects such as falling off and wobbling.

On the other hand, in the case of the latter type of bearing, if a material with a small coefficient of thermal expansion relative to the metal, such as graphite, is used for the solid lubricated molded body, a shrink fit effect occurs due to casting, and the retention of the molded body in the metal is stabilized. It has the advantage of being stable even in high-temperature atmospheres and offering nine sliding properties. However, this type of bearing has several disadvantages, such as the manufacturing process is complicated and expensive, and it is limited to special applications. In this regard, an example of the prior art will be explained with reference to FIG.

That is, one or two rows of holes 2 are provided on the surface of a plate-shaped shell mold 1, and cylindrical graphite pins 3 are fitted into the holes to form a barrel shape with the graphite pin fitting portion outside. After assembling and forming a core disk as shown in FIG. 1, the bearing metal is cast around the core disk. In this method, it is necessary to prepare a large number of plate-shaped shell hooks to make one bearing, and it is difficult to assemble them into a barrel shape, as shown in Figure 1. Sh.

It takes time and effort. Furthermore, since the circumference of the core disk must be divided into multiple parts, there are restrictions on the shape in which the graphite bottles can be arranged.

In other words, it is possible to densely arrange graphite bottles in the axial thickness of one cylinder.

It is impossible to obtain a dense array in circumferential meat.

It is an object of the present invention to solve these problems and provide a method for manufacturing a round bearing at low cost and with excellent holding stability of solid lubricated molded bodies.

The present invention has a large number of radial holes, and combines a side layer divided into a plurality of 9B cylinder shapes, a removable Ojl pin that matches the holes, and a wave control into a cylindrical shape! ! The metal is then disassembled to obtain a sand mold with a large number of holes or holes on the outer circumference, and these holes or a large Km body lubricated molded body Insert and fix the material, use it as a core board, and cast metal on the outer periphery.After cooling, #II is removed.
The present invention relates to a method of manufacturing a bearing, characterized in that the lubricated molded body of the bearing sliding motion K11 is partially exposed by machining the cast product.

The materials of the solid lubricant molded body O used in the present invention are graphite, silicon nitride, and molybdenum disulfide.

Tungsten disulfide, tungsten diselenide.

Cadmium disulfide and the like have no limitations, but Sa is often used. Cast metals include steel alloys used for bearings, aluminum alloys, cast iron, etc., and Toty-made shank is split into fibers.

In addition, the side layer, sieve, and fixing tools for gold I are suitable for repeated use, such as steel, cast iron, steel alloy, aluminum alloy, etc., and there is no splitting as long as they are made of a material with small dimension changes throughout the seasons. The molding sand is preferably shell sand and Cos# from the viewpoint of degassing and cost.

When inserting the sand mK body-slip molded body, the stability may be improved by using an adhesive. Then, first, a large number of radial holes 5. as shown in FIG. A cylindrical split W4 (generally divided into two parts) having... is prepared. In addition, as shown in @3H, the body part 6a has a cross-sectional shape that can be inserted into the six holes 5 provided in the side layer 4, and the body part 6b serves as a stopper. Fabricate and further tie -114 together as shown in No. 4i1.

A fixing ring 7 for fixing is prepared. These O-en^
As shown in Figure 4, fill the shell with 8-karat gold sand, mold it, disassemble it as shown in Figure 4, and make #211.
8, in other words, first remove the bottle 6 in the circumferential direction (direction A and B) and fix the primary VC 7t@
Remove in direction (C and D direction) and finally IHM4tM1
After disassembling in directions (E and F directions), sand m8 having a large number of holes a & . . on the outer circumferential surface is taken out.

Thus obtained 7'l:, il'ff18 is turtle 6
As shown in the figure, the graphite solid lubricant molded bodies 3 are inserted and fixed into the holes 9 on the outer circumferential surface, respectively. Metal 12 is poured from sprue 11. The inner and outer peripheral surfaces of the thus obtained composite of the graphite integral III-layer molded body 3 and the cast metal 12 are machined to form a cylindrical bearing as shown in FIG. 1E7.

2nd #A, 4th SWA, and 4th ai which are an embodiment of the present invention
By preparing a set of a warp, AI bottle, and fixing ring as shown in 9, and using these repeatedly, it is possible to easily integrally mold a core with a large number of radial holes. can be simplified and contribute to cost reduction.

The following effects can be obtained by the manufacturing method described above.

(1) Since foundry sand (shell sand, CO [sand, etc.) can be used for the core of the lj1-body lubricated molded body, increase in material costs can be suppressed, and it is also effective for gas release, hot water bathing, and fire resistance. It is possible to improve castability such as properties.

(2) There are no restrictions on the arrangement method of KJI@bins, as shown in 9, where the inner sandals are shaped like a barrel, and can correspond to various usage conditions. It becomes possible to design *build a nine-wheeled bridge.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a core star produced by a conventional method. Figures 2 to 7 are drawings for explaining one embodiment of the present invention, respectively. Figure jlEg is a perspective view of the side layer of the rounding that makes the core shoe, and Figure JIa is a view of the side layer of the core jI. A perspective view showing a salt bottle for forming a large number of holes on the outer circumferential surface, Fig. 4 is a vertical sectional view showing a state in which the core overflow is integrally molded, and No. s#A shows the core bottom after molding. G6g is a partially omitted vertical cross-sectional view showing the method of rounding, and No. 7 WJ is a partially omitted vertical cross-sectional view showing a nine-wheel bridge that has been machined nine times after casting. Explanation of symbols l... Shell casting jl 2... Hole 3... Graphite bottle (solid lubricant molded body 4... Split l115... Hole 6... Shoe hinge 7... Fixing ring 8 ...
Core xii<sand layer) 9...hole 1G...outer m (sand j
1) 11...Gate 12...Cast metal 1"f, 7

Claims (1)

[Scope of Claims] L: A fixing device that fixes a cylindrical nine-piece plate divided into a plurality of cylindrical parts provided with a large number of radial holes, a removable cross-bin attached to the holes, and a nine-piece plate together in a cylindrical shape. Combined with odor, molding sand is put into a metal mold and molded, and then the gold layer is decomposed to form a large number of holes or holes on the outer circumferential surface? ! Got III? - Solid lubricated molded bodies are inserted and fixed into these holes or holes, and metal is cast around the outer periphery of the core. After cooling, remove the sand layer and machine the casting.
A method for manufacturing a bearing, comprising partially exposing a bearing sliding surface K1m lubricated molded body. 2. Claim 8, wherein the divided side layer is two side layers.
Manufacturing method for bearings as described in Paragraph 1.