Steel-based copper alloy dual-metal sliding bearing and preparation method thereof

A sliding bearing and copper alloy technology, applied in sliding contact bearings, rotating bearings, bearings, etc., can solve the problems of reduced bearing wear resistance, high replacement frequency, poor lubricity, etc., and achieve self-lubrication and wear resistance. The effect of excellent capacity, high carrying capacity and low cost

Active Publication Date: 2010-02-17
COB PRECISION PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are mainly two types of sliding bearings of this type. One is self-lubricating sliding bearings with copper alloy as the matrix, which are used in the lifting and lowering of the boom and the telescopic parts of the stick, which can meet the wear resistance requirements under high load and very low speed. , but the main disadvantage of this type of bearing is the high cost; the other type is a sliding bearing based on alloy steel used in the rotating part of the bucket, which can meet the service life requirements under high load and relatively high speed. The main problem is that the lubricity is poor and the frequency of external lubrication is high. If there is a lack of oil or less oil, the wear resistance of the bearing will decrease significantly, so that the frequency of replacement is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 Taking the preparation of a steel-based copper alloy bimetal sliding bearing with an inner diameter of 50mm, an outer diameter of 70mm and a height of 40mm as an example, the preparation method includes the following steps:

[0016] 1. The C45 steel pipe with an outer diameter of 70mm and an inner diameter of 60mm is machined into a seamless steel sleeve (shaft sleeve) with a height of 40mm, and the secondary processing allowance of the wall thickness must be ensured;

[0017] 2. The inner surface of the shaft sleeve is electroplated with copper to form an electroplated copper layer with a thickness of 5 μm. The surface of the coating is required to be dense and uniform without oxidation;

[0018] 3. Powder mixing according to the following weight ratio: electrolytic copper powder 55%, aluminum powder 3%, titanium powder 8%, tin powder 12%, iron powder 5%, copper phosphide powder 10%, nickel powder 5%, graphite powder 1.5%, zinc stearate 0.5%, utilize the c...

Embodiment 2

[0024] The preparation process of embodiment two is the same as that of embodiment one, except that the steel sleeve is a stainless steel tube, and the thickness of the copper coating on the inner surface is 8 μm; the weight content of each raw material in the powder metallurgy material is respectively: electrolytic copper powder 66%, ball Aluminum powder 16%, titanium hydride powder (TiH2) 3%, copper-tin alloy powder (QCuSn10) 2%, iron phosphide powder (FeP 23 ) 1%, copper phosphide powder 10%, electrolytic nickel powder 1% and molybdenum disulfide 1%; the pressing pressure of the powder metallurgy material in the ring mold is 500MPa; The temperature was 900°C, and the sintering time was 3 hours.

Embodiment 3

[0025] The preparation process of embodiment three is the same as that of embodiment one, except that the thickness of the copper coating on the inner surface of the steel sleeve is 6 μm; the weight content of each raw material in the powder metallurgy material is respectively: electrolytic copper powder 70.5%, copper aluminum alloy powder ( QCuAl 10 ) 10%, reduced titanium powder 5%, copper-tin alloy powder (QCuSn 8 ) 7%, reduced iron powder 4%, iron phosphide powder (FeP 23 ) 2% (as phosphorus), 0.5% each of graphite, molybdenum disulfide and zinc stearate; the pressing pressure of the powder metallurgy material in the ring mold is 250MPa; the assembly is placed in a helium atmosphere sintering furnace for sintering and molding. The sintering temperature is 1050° C., and the sintering time is 1 hour.

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Abstract

The invention discloses a dual-metal sliding bearing and a preparation method thereof. Carbon steel or stainless steel is taken as an outer layer material, and a powder metallurgy material taking a copper alloy as a basal body is taken as an inner layer material; the inner surface of the outer layer material is electroplated to form an electroplated copper layer with the thickness of 4-8 micrometres; the inner layer material comprises the following components by weight percent: 1%-20% of aluminum, 1%-8% of titanium, 1%-15% of stannum, 0.1%-5% of ferrum, 0.1%-2% of phosphorus, 0.1%-5% of nickel, at least one of 0.1%-2% of graphite and 0.1%-2% of molybdenum disulfide or 0.1%-2% of zinc stearate, and the balance of copper; and the bearing is impregnated with lubricating oil. The dual-metal sliding bearing has the advantages of low cost, high carrying capability, self-lubrication, excellent abrasion resisting capability, and the like, and can be widely applied to reciprocating swing positions of a swing arm, a bucket rod, a bucket, and the like of a large-tonnage and high-power excavator.

Description

technical field [0001] The invention relates to a bimetallic sliding bearing and a preparation method thereof, in particular to a bimetallic sliding bearing which uses an integral carbon steel or stainless steel as a bearing substrate and copper-aluminum alloy as a substrate as a wear-resistant and friction-reducing layer, and is prepared by pressing and sintering sintered powder. An oil-containing bimetal sliding bearing and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of technology in the field of construction machinery, higher requirements have been put forward for the key working devices of hydraulic excavators, especially large-tonnage and high-power excavators. The working device is a device that directly completes the excavation task, and its reliability has a great influence on the performance of the hydraulic excavator. It is composed of three parts: the boom, the stick, and the bucket. The lifting of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/12F16C33/06F16C33/12F16C33/14C22C9/00C22C9/01C22C9/02C22C9/06C22C30/04C25D7/10B22F3/16B22F3/26
Inventor 张国强王宏刚倪志伟范建明杨生荣
Owner COB PRECISION PARTS
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