Preparation method of bearing bush with high bearing capacity

A high bearing capacity bearing technology, applied in the field of high bearing capacity bearing preparation, can solve the problems of limited bearing capacity, cracking, delamination, etc., and achieve the effect of improving fatigue strength, bearing capacity and performance

Inactive Publication Date: 2012-04-25
广东韶配动力机械有限公司
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Problems solved by technology

However, the chemical composition of the lead-tin-copper ternary alloy layer determines that the bearing capacity is limited (about 50Mpa), and it is prone to defects such as cracks and delamination. As a result, bearing manufacturers have to bear a high three-guarantee claim burden for a long time, and at the same time limit Increased performance of OEM machines

Method used

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Embodiment Construction

[0016] A method for preparing a bearing bush with high bearing capacity, comprising the following steps:

[0017] (1) A lead-tin-copper ternary alloy antifriction layer is plated on the substrate;

[0018] (2) electroplating an indium layer on the lead-tin-copper ternary alloy friction-reducing layer;

[0019] (3) After the indium layer is electroplated, it is diffused in oil or glycerin solution for three hours at a temperature of 150° C., so that the indium layer is evenly diffused into the lead-tin-copper ternary alloy friction-reducing layer.

[0020] In step (1), the plating solution is configured as follows: 90-120 grams / liter of lead fluoroborate, 10-18 grams / liter of stannous fluoroborate, 2-3 grams / liter of copper fluoroborate, 70-80 grams of fluoroboric acid / L, gelatin: 5-10 g / L, boric acid: 20-30 g / L, resorcinol: 5-10 g / L, current density 1.5-2.5 A / dm 2 , temperature: 15~20 ℃; Lead-tin alloy is used as the anode, and the content ratio of lead and tin in the lead-...

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Abstract

The invention relates to a method for preparing a bearing bush with high bearing capacity, which comprises the following steps: (1) plating a lead-tin-copper ternary alloy friction reducing layer on a substrate; (2) electroplating an indium layer on the lead-tin-copper ternary alloy friction reducing layer; (3) after electroplating the indium layer, allowing the substrate to diffuse in an oil or glycerol solution for three hours at a temperature of up to 150 DEG C so as to allowing the indium layer to be uniformly diffused on the lead-tin-copper ternary alloy friction reducing layer. Compared with the prior art, the invention adds indium on the basis of the lead-tin-copper ternary alloy friction reducing layer of the bearing bush; indium is an element with soft texture and good ductility, so the crack resistance and delamination resistance of the bearing bush are greatly improved, and the bearing capacity is greatly increased; in addition, with the preparation method of the present invention, indium is uniformly diffused on the lead-tin-copper ternary alloy friction reducing layer, which improves the fatigue strength to 90-105 MPa; and the invention overcomes the problems that indium metal is active, and the electroplating and diffusion of indium in ternary alloy has certain technical difficulties.

Description

technical field [0001] The invention relates to the technical field of bearing pads, in particular to a preparation method for bearing pads with high bearing capacity. Background technique [0002] As the part where the bearing and the shaft are in contact, the bearing pad plays a pivotal role in the fields of engines, compressors, and internal combustion engines. The traditional bearing bush is composed of a substrate and a friction-reducing layer on the substrate. The substrate is composed of a steel backing layer and a copper alloy base layer on the steel-backing layer. The anti-friction layer is generally made of lead-tin Copper ternary alloy plating. However, the chemical composition of the lead-tin-copper ternary alloy layer determines that the bearing capacity is limited (about 50Mpa), and it is prone to defects such as cracks and delamination. As a result, bearing manufacturers have to bear a high three-guarantee claim burden for a long time, and at the same time li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/10C25D3/56C25D3/54C25D5/50
Inventor 刘志玉谭少伟黄从四黄文平
Owner 广东韶配动力机械有限公司
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