JPS60205016A - Manufacturing method of slidable compound member - Google Patents

Abstract

PURPOSE:To facilitate the integral joint between a cylindrical metal lining and a slide surface layer, by inserting a copper alloy coil having a reduced diameter, into the cylindrical metal lining after a primary plating layer is formed on the inner surface of the cylindrical metal lining, and then by heat-treating the cylindrical metal lining to integrally joint the metal lining and the coil with each other. CONSTITUTION:There is prepared a cylinder made of iron or iron alloy. The inner surface of the cylinder is formed to have a predetermined inner diameter, and the cylinder is therefore used as a metal lining 1. After the metal lining 1 is cleaned and degreased, a primary plating layer 2 made of Ni or Ni-P alloy is formed in the inner surface of the metal lining 1. Meanwhile a wire 3 made of copper alloy is wound to have an outer diameter (d) which is larger than the inner diameter D of the metal lining 1, so that a copper alloy coil 4 is formed. Further, the coil 4 is inserted into the metal lining 1 after the diameter of the coil 4 is reduced, and therefore, they are integrally incorporated together due to the repulsive force of the coil 4. Further, the thus integrally incorporated metal lining 1 and coil 4 are subjected to heat-treatment to integrally joint both coil 4 and metal lining 1 under action of interdiffusion through the primary plating layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that the inner surface of a cylindrical back metal made of iron or iron alloy is
The present invention relates to a method of manufacturing a composite sliding member in which sliding surface layers made of copper alloy are integrally joined. A composite sliding member (usually called a two-layer bearing) in which a sliding surface layer made of a copper alloy is integrated with the inner surface of a metal backing made of iron or an iron alloy by a method such as casting, phosphorization, or crimping. ) is already known and has been put into practical use.

However, composite sliding members manufactured by these methods often have problems in which peeling occurs between the sliding surface layer and the backing metal during use, impairing their function as composite sliding members. Since this method requires a lot of equipment and a complicated process, there are problems such as the resulting composite sliding member being expensive.

In order to solve these problems, for example,
No. 34494 proposes a method in which a sliding surface layer made of high lead bronze is integrally joined to the inner surface of a cylindrical back metal made of iron or an iron alloy.

To be more specific, after tin-plating the inner surface of the cylindrical back metal,
A cylindrical body made of high-lead bronze is fitted to the inner surface of the back metal in a loose state such that it comes into close contact due to thermal expansion, or is fitted by shrink fit or cold fit.
A method in which a tin-lead alloy, so-called solder, is formed on the joint surface by the diffusion effect of the lead component of the cylindrical body made of tin and high-lead bronze applied to the inner surface of the backing metal by heating to 50°C, and the two are joined together. It is.

However, in this manufacturing method, in order to obtain a good bond between the backing metal and the cylindrical body made of high lead bronze, the fitting condition between the backing metal and the cylindrical body is important, so the thin cylindrical body and the backing metal are thermally expanded. Sometimes it is necessary to process the material to dimensions that allow close contact or shrink fit or cold fit, but this process is particularly difficult for thin-walled cylindrical bodies, and fitting operations such as shrink fit or cold fit are difficult. The problem is that it is very complicated.

In addition, this technique integrates the two by forming a tin-lead alloy on the joint surface, and there are also problems such as restrictions on the copper alloy that forms the sliding surface layer.

In view of these problems, the present invention makes it possible to easily integrate a sliding surface layer made of a copper alloy onto the inner surface of a cylindrical back metal made of iron or an iron alloy, and furthermore, the back metal and the sliding surface layer can be easily integrated. The technical problem is to find a method for manufacturing a composite sliding member that can form a strong bond with the material.

In order to solve the above problems, the present invention provides the following technical means (
(manufacturing method).

That is, a base plating layer of nickel or nickel-phosphorus alloy is formed on the inner surface of a cylindrical back metal made of iron or an iron alloy, and IIj! made of a copper alloy is formed on the inner surface of the back metal. A copper alloy coil formed by winding a strip is inserted after reducing its diameter, and is held in close contact with the inner surface of the backing metal by the repulsive force generated by the reduction in the diameter of the coil, thereby inactivating or reducing it. The coil and the backing metal are bonded and integrated by mutual diffusion through the base plating layer by heat treatment in a neutral atmosphere to form a composite material, and the composite material is machined to slide a copper alloy onto the inner surface of the backing metal. The purpose is to form a surface layer.

The above-mentioned technical means will be explained in more detail with reference to FIG. 2, which shows the shape of each member in each manufacturing step in the order of the manufacturing steps shown in FIG. 1.

[First step] A cylindrical body made of iron or an iron alloy is prepared, and the inner surface of the cylindrical body is formed to have a predetermined inner diameter of 0, and this is used as the back metal 1. Next, after cleaning and degreasing the backing metal 1, a base plating layer 2 is applied to its inner surface [see FIG.
b) see].

The base plating layer 2 promotes bonding and integration between the back metal 1 and a copper alloy forming a sliding surface layer to be described later, and in the present invention, nickel or a nickel-phosphorus alloy is used.

Then, these are applied to the inner surface of the backing metal to a thickness of 5 to 15 μm by electrolytic plating or electroless plating.

[Second step] The wire or strip 6 made of copper alloy is made so that the outer diameter (d) is the inner diameter of the backing metal 1 (■) and d>D (in practical terms,
d=1.03-1.07D is preferred. ), see figure (b)].

The copper alloy forming the coil 4 must exhibit good sliding properties and be able to form the wire or strip 6. Copper alloys that are difficult to form are excluded.

In the present invention, brass that satisfies the above-mentioned functions,
Bronze, aluminum bronze, phosphor bronze, nickel silver, etc. are used.

[Third step] After cleaning and degreasing the copper alloy coil 4 obtained in the second step, the coil 4 of the copper alloy obtained in the second step is twisted in the winding direction to reduce its diameter and inserted into the back metal 1 obtained in the first step, and The coil 4 is brought into close contact with the inner surface of the backing metal due to the repulsive force caused by the diameter reduction, and the two are combined [see Figure 2 (C)] [Fourth step], the combination product of the backing metal 1 and the coil 4 obtained in the third step. are heated in an inert or reducing atmosphere at a temperature of 800 to 900°C for 30 to 60 minutes, and the coil 4 and backing metal 1 are bonded and integrated by mutual diffusion via the base plating layer 2. This is then cooled (air cooling is preferable) to form a composite material.Then, the composite material is mechanically IJOed to predetermined dimensions to form a composite material having a sliding surface layer 5 made of copper alloy on the inner surface of the backing metal. (See Figure 2).

This bonding and integration of the coil 4 and the backing metal 1 is performed using the base plating layer 2.
When the nickel or nickel-phosphorus alloy of the back metal 1 and the iron or iron alloy of the backing metal 1 and the coil 4 are heated, a contact portion 1 (and a bonding layer (alloy layer) 6 is formed by the interdiffusion effect of K).

6(a), (o), and (c) show cross-sectional shapes of wire rods and strips 6 suitable for forming the coil 4. FIG.

That is, in the present invention, the cross-sectional shapes of the wire and strip 6 for forming the coil 4 are circular as shown in (A), and (
The rectangular shape shown in b) and the circular shape shown in r-t are preferable for forming the coil 4, bonding it to the back metal 1, and obtaining a thin sliding surface layer 5.

The diameter of these wire rods 6 (d5 and the thickness t' of the wire rod 6)
It is desirable that the value takes into account the machining allowance for the thickness 1) of the sliding surface layer 5, and d'-1, 5 to 2t and t' = 1.2 to 1.51 are generally preferred. It is.

Figure 4 shows that the coil 4 is wound at a constant pitch (
A groove 7 is formed on the inner surface of the composite sliding member by winding it with a certain distance (interval) and joining it with the back metal 1. This can be used as a groove for embedding the agent.

By adopting the above means, the present invention has the following effects.

1) Since the coil can be formed by a simple method of winding a wire or strip, it is easy to manufacture.

2) Since the coil can be easily inserted into the backing metal by reducing its diameter, there is no need to make exact fitting dimensions between the backing metal and the coil, and the work can be done easily.

6) The close force that influences the bonding between the backing metal and the coil can be obtained by the repulsive force (returning force) by reducing the diameter of the coil and inserting it into the backing metal, and no other pressurizing means is required.

4) By heat-treating the coil and the backing metal by bringing them into close contact with the backing metal due to the repulsive force of the coil itself, a strong bond can be obtained due to the mutual diffusion effect with the base plating applied to the backing metal,
Peeling from the backing metal can be prevented. 5) Since 1+ gold and coils can be easily formed into arbitrary dimensions, it is possible to obtain a large amount of composite sliding members by forming them into a long length, joining them together, and then cutting them into appropriate dimensions. can.

6) By varying the winding pitch of the coil, oil grooves or grooves for embedding solid lubricant, etc. can be easily formed.

Composite sliding members with excellent sliding performance can be manufactured easily and inexpensively, and workability and economic efficiency can be improved. Examples of the present invention will be shown below.

[Example] A steel pipe (carbon steel pipe for mechanical structure) with an inner diameter of 44J
After machining to 11 x outer diameter 5011 x length 60 m1,
. Next, a phosphor bronze strip with a thickness of 3 xx was reduced in size, inserted into the back metal, and combined with the back metal. Next, the assembled product was placed in a nitrogen gas atmosphere furnace and heat-treated at a temperature of 850°C for 40 minutes to bond the contact parts of the coils together, and to connect the backing metal and the coil through the base plating layer. A composite material was obtained by bonding and integrating them by mutual diffusion.

Then, the composite material is machined to have an inner diameter of 40 mm x an outer diameter of 5 mm.
A composite sliding member with a sliding surface layer thickness of 2111 mm was prepared using 0 mm x 60 mm length.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the manufacturing method of the composite sliding member of the present invention, and Figures 2 (a), (b), and (c) show the shape of the composite sliding member of the present invention at each manufacturing process. 6 (I) and (C) are sectional views of the wires and strips forming the coil, and FIG. 4 is a sectional view showing the shape of another composite sliding member of the present invention. 1: Backing metal, 2: Undercoat plating layer, 3 Two-wire material, 4: Coil, 5: Sliding surface layer Patent applicant Oiles Industries Co., Ltd. Figure 1 (C) (D) Figure 3 Figure 4 Cause

Claims (1)

[Claims] 1) A step of applying a base plating layer of nickel or nickel buttock alloy to the inner surface of a cylindrical backing metal made of iron or iron alloy and having a predetermined inner diameter of 0; 2) Made of copper alloy. Step of winding the wire or strip material so that the outer diameter (d) is d>l with respect to the inner diameter of the backing metal (0) to form a coil; 3) Putting the coil on the inner surface of the backing metal and reducing its diameter. 4) A step of combining the backing metal and the coil by inserting the coil into the backing metal and bringing it into close contact with the inner surface of the backing metal due to the repulsive force caused by the diameter reduction of the coil; 4) Inserting the coil on the backing metal in an inert or reducing atmosphere Heat treatment is performed at a temperature of ~900 °C to bond and integrate the coil and the backing metal by mutual diffusion via the base plated layer to form a composite material, and the composite material is machined to coat the inner surface of the backing metal with a copper alloy. A step of forming a composite sliding member having a sliding surface layer. A method for manufacturing a composite sliding member that consists of the steps 1) to 4) above.