JPH08135660A - Bearing metal and its manufacture - Google Patents

Abstract

PURPOSE: To provide bearing metal by which strength of separative crack resistance is improved and a separative crack is easily inspected by forming one among a tin plating-applied copper fine wire, an aluminium fine wire and an aluminium alloy fine wire in a net shape, and embedding it in a soft metallic layer composed of one of white metal and aluminium-tin alloy. CONSTITUTION: A net-like copper fine wire 5 is cast in white metal 2 composed mainly of 5 to 13% antimony, 2 to 8.5% copper and 0 to 2% cadmium having a tin group on an inside surface of base metal 1 after it is fixed to the base metal 1 by spot welding by a copper or copper alloy welding rod by keeping away from an oil groove 4a, 4b part, and terminals 6a and 6b of a copper wire are exposed outside of the white metal 2. Therefore, the white metal 2 and the net-like copper fine wire 5 become a composite material, and the net-like copper fine wire 5 improves fatigue strength, that is, strength of separative crack resistance of the white metal 2. When electric resistance between the terminals 6a and 6b of the copper fine wire is monitored, since an electric resistance base changes when the white metal 2 is separated and the copper fine wire is cut off, the occurrence of a separative crack can be detected.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a diesel engine bearing,
The present invention relates to bearings mainly applied to large machines such as turbine bearings and rolling roll bearings.

An example of the manufacturing process of a conventional bearing having a white metal layer on its inner surface is shown in FIGS. 3 (A) and 3 (B). As shown in the figure, a carbon steel base metal 1 is tin-plated 3 for improving the casting of the white metal 2, and then the white metal 2 is cast on the inner surface by centrifugal casting. Then, the conventional bearing is manufactured by rough finishing, dividing into two (sometimes divided into three and four) and finishing.

[0003]

In the conventional bearing, fatigue cracks are formed in the white metal or aluminum-tin alloy layer on the inner surface due to the repeated high surface pressure received from the shaft and the repeated external force accompanying the deformation of the bearing. May occur, causing peeling.

However, in order to confirm whether the white metal or the aluminum-tin alloy layer on the inner surface of the conventional bearing is peeled off as described above or is sound, a large engine such as a diesel engine is disassembled. do it,
Since the inner surface of the bearing must be inspected, for example, in the case of a diesel engine such as a large transport ship, there is a problem that a single inspection requires enormous cost of over 10 million yen and man-hours.

An object of the present invention is to provide a bearing metal whose white metal or aluminum-tin alloy layer on the inner surface of the bearing is improved in peeling resistance and in which peeling inspection is easy.

[0006]

The bearing metal according to the first aspect of the present invention is a bearing having a soft metal layer made of one of white metal and aluminum-tin alloy on the inner surface, in which tin-plated thin copper wire and thin aluminum wire are provided. It is characterized in that one of the aluminum alloy thin wires is reticulated and embedded in a soft metal layer made of one of white metal and aluminum-tin alloy.

According to a second aspect of the present invention, the bearing metal according to claim 1 is a continuous thin wire made of one of tin-plated copper thin wires, aluminum thin wires, and aluminum alloy thin wires, which are net-shaped. It is characterized in that it is composed of a wire and is embedded in a soft metal in a mesh shape without contact.

In the method of manufacturing a bearing metal according to the third aspect of the present invention, a net made of one of tin-plated copper thin wires, aluminum thin wires and aluminum alloy thin wires is formed in a carbon steel cylindrical base metal. After spot welding on the surface, the thin wire is embedded in a soft metal composed of one of white metal and aluminum-tin alloy by centrifugal casting.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a bearing metal in which a continuous tin-plated thin copper wire, aluminum thin wire and aluminum alloy thin wire are arranged in a mesh shape without contacting each other. After spot welding on the inner surface of a carbon steel cylindrical base metal, the thin wire is embedded in a soft metal made of one of white metal and aluminum-tin alloy by centrifugal casting.

[0010]

The bearing metal according to the first and third aspects of the present invention is formed by casting fine wires made of copper or the like in a net-like shape, so that the bearing metal is made of white metal or aluminum-tin alloy soft metal and copper fine wires. Since it is made of a material, it is possible to improve the fatigue strength of the bearing metal, that is, the resistance to peeling.

The tin plating applied to the copper wire has the effect of ensuring castability with the soft metal layer of white metal or aluminum-tin alloy, and the matrix of the bearing metal remains soft metal. , It does not impair the embeddability of foreign matter and abrasion powder.

In the bearing metal and the manufacturing method thereof according to the second and fourth aspects of the invention, as shown in FIG. 1, the copper thin wire is made into a continuous net-like thin wire, and therefore, in addition to the functions of the first and third inventions. If the electrical resistances of both terminals 6a and 6b are constantly monitored, the electrical resistance value will change if peeling occurs and the thin copper wire or the like is cut. Occurrence can be easily detected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a structural view of the bearing of the first embodiment, FIG. 2 is a manufacturing process drawing of the bearing of the first embodiment, and FIG. 1B is a detailed view of spot welding. In the figure, the inner surface of the base metal 1 is a tin-based antimony 5 to 13%, copper 2 to 8.5%, and cadmium 0.
Oil groove 4 in white metal 2 with 2% as main component
The net-like copper fine wire 5 is fixed to the base metal 1 by spot welding at a constant length using a copper or copper alloy welding rod by casting, and the terminals 6a, 6b of the copper wire are made of white metal 2. It is exposed to the outside.

In the manufacturing method of the first embodiment, as shown in FIG. 2, copper or copper is provided by arranging a portion where the fine copper wire 7 is divided along the inner surface of the base metal 1 and a portion where the oil grooves 4a and 4b are cut off. The terminals 6a and 6b of the thin copper wire 7 are exposed to the outside of the base metal 1 by spot welding 9 using an alloy welding rod 8 at fixed intervals to fix the base metal 1 to form a mesh. The subsequent manufacturing process is similar to the conventional bearing manufacturing process 2, in which the inner surface of the base metal is tin-plated, and then the white metal is cast by centrifugal casting. After that, rough finishing, division and finishing are performed.

Next, the operation of the first embodiment will be described. The white metal 2 and the reticulated copper fine wire 5 become a composite material, and the reticulated copper fine wire 5 improves the fatigue strength of the white metal 2, that is, the peeling resistance. Since White Metal 2 remains a soft alloy, it does not impair the embeddability of foreign matter and abrasion powder. Since the thin copper wire 7 is a single wire, the terminals 6a and 6b of the thin copper wire
If you monitor the electrical resistance between them, White Metal 2
When the copper fine wire 7 is cut, the electrical resistance value changes, so that the occurrence of the peeling of the bearing can be easily detected without disassembling the large machine.

A second embodiment according to the present invention will be described with reference to FIGS. The inner surface material of the bearing is not aluminum-based and is made of tin 40% alloy or bronze, and the material of the reticulated fine wire is aluminum or aluminum alloy manufactured by the same method as the first embodiment. The operation of the second embodiment Is the same as the operation of the first embodiment.

A third embodiment will be described with reference to FIGS. Bearing surface material is copper-based tin 2-11%, zinc 1-
A bronze soft alloy containing 12% of lead and 0 to 7% of lead was used, and the material of the reticulated fine wire was copper, which was manufactured by the same method as in the first embodiment. The operation of the third embodiment is the same as that of the first embodiment. The operation is the same as that of the first embodiment.

A fourth embodiment according to the present invention will be described with reference to FIGS. In the figure, a white metal 2 is cast on the inner surface of a base metal 1, and a reticulated copper fine wire 5 is embedded in the white metal layer. In the manufacturing method of the fourth embodiment, the net of the copper fine wires 5 cut into the inner surface of the base metal 1 is fixed by spot welding with a welding rod 8 made of copper or copper alloy. After that, the white metal 2 is tin-plated by centrifugal casting as in the conventional manufacturing process. The reticulated copper fine wire may be reticulated aluminum fine wire or reticulated aluminum alloy fine wire. The operation of the fourth embodiment will be described. The spot welding is to maintain the position of the reticulated copper fine wire 5 when centrifugally casting the white metal 2 in the subsequent step. The tin plating improves the adhesion between the reticulated copper fine wire 5 and the white metal 2. The reticulated copper thin wire 5 improves the fatigue strength of the white metal 2, that is, the peeling resistance strength, and does not impair the foreign matter embeddability.

[0019]

【The invention's effect】

(1) The inner surface material of the bearing is made of a composite material of white metal or fine reticulated copper wire using a soft metal such as aluminum-tin alloy as a matrix or aluminum or aluminum alloy thin wire, so that the inner surface material of the bearing is resistant to peeling, The crack strength is improved and there is an effect of preventing peeling and crack damage. Even if a fatigue crack occurs in the matrix of white metal or the like, the net-like or fine wire must be cut before it becomes a peeling piece and falls off. Therefore, the life until peeling greatly increases.

(2) Since the peeling of the bearing inner surface material can be constantly monitored by monitoring the electrical resistance at both ends of the reticulated copper thin wire, the peeling can be easily detected by detecting the change in the electrical resistance. Can be detected. Therefore,
It is not necessary to dismantle a large machine such as a marine diesel engine to inspect the bearing, and it is possible to reduce enormous inspection costs that may exceed 10 million yen per time.

[Brief description of drawings]

FIG. 1 is a structural diagram of a bearing according to a first embodiment of the present invention.

FIG. 2A is a manufacturing process diagram of the first embodiment according to the invention. (B) Detailed view of spot welding.

FIG. 3 is a manufacturing process diagram of a bearing having a white metal layer on the inner surface of a conventional example.

[Explanation of symbols]

1 ... Base metal, 2 ... White metal, 3 ... Tin plating solution, 4
a, 4b ... Oil groove, 5 ... Reticulated copper fine wire, 6a, 6b ... Copper fine wire terminal, 7 ... Copper fine wire, 8 ... Copper or copper alloy welding rod, 9 ...
Spot welding.

Claims (4)

[Claims] 1. A bearing having a soft metal layer made of one of white metal and aluminum-tin alloy on its inner surface, wherein one of tin-plated copper thin wire, aluminum thin wire and aluminum alloy thin wire is reticulated. The bearing metal is embedded in a soft metal layer made of one of white metal and aluminum-tin alloy. 2. A thin wire made of one of a tin-plated copper thin wire, an aluminum thin wire and an aluminum alloy thin wire, which are formed in a mesh shape, is composed of one continuous wire and does not come into contact with each other. The bearing metal according to claim 1, wherein the bearing metal has a mesh shape and is embedded in a soft metal. 3. A net comprising one of tin-plated copper thin wires, aluminum thin wires, and aluminum alloy thin wires is spot-welded to the inner surface of a carbon steel cylindrical base metal,
A method of manufacturing a bearing metal, wherein the fine wire is embedded in a soft metal made of one of white metal and aluminum-tin alloy by centrifugal casting. 4. A carbon steel cylindrical base metal, which is formed by continuously arranging one of tin-plated copper thin wires, aluminum thin wires, and aluminum alloy thin wires in a net shape without making contact with each other. After spot welding on the inner surface of the bearing, the thin wire is embedded in a soft metal made of one of white metal and aluminum-tin alloy by centrifugal casting.