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Connecting rod bushing interference assembling method

An assembly method and connecting rod bushing technology, which are used in engine components, metal processing equipment, mechanical equipment, etc., can solve the problem that the engine connecting rod and bushing cannot meet the assembly requirements of large interference, and improve the one-time improvement. Success rate, uniform force, and the effect of reducing processing steps

Inactive Publication Date: 2014-04-02
刘福平
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AI Technical Summary

Problems solved by technology

[0024] (2) The existing room temperature assembly method of engine connecting rod and bushing cannot meet the assembly requirements of large interference

Method used

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  • Connecting rod bushing interference assembling method
  • Connecting rod bushing interference assembling method
  • Connecting rod bushing interference assembling method

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Embodiment Construction

[0058] Combine below Figure 2 to Figure 9 , the present invention is further described:

[0059] The basic process of powder forging of connecting rod includes the preparation of metal premixed powder, pressing and forming of pre-pressed parts, sintering of connecting rod pre-pressed parts at high temperature, closed-die forging at forging temperature, and finally shot blasting treatment, etc.

[0060] Specifically, the following steps are included:

[0061] 1. Put the bushing 2 at room temperature (25°C) into the connecting rod small head hole 11 of the connecting rod preform under high heat (1100°C-1200°C, usually called hot forging temperature), and then heat Forging the connecting rod preload and the bushing 2 at the forging temperature (1100°C-1200°C).

[0062] The forging principle is as follows: before the hot forging, the pre-pressed part of the connecting rod 11 is in a high-temperature state. At this time, after inserting the bushing 2 at room temperature, there w...

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Abstract

The invention relates to a connecting rod bushing interference assembling method. The method comprises the steps of placing a copper-base alloy bushing in the hot forging process, wherein the outer circular surface of the bushing is unnecessary to fine finish before the forging, and a small-end pore of an iron-base alloy connecting rod is well bonded with a joint surface of the bushing after the forging; primarily connecting the bushing with the small-end pore of the connecting rod in an expansion manner by utilizing an expansion tool, so that not only can the clearance formed in the cooling process of a forged piece be eliminated, but also the interference assembling can be realized, the small-end pore of the connecting rod and the outer circular surface of the bushing are not machined in the entire process, the success rate for assembling the bushing in one step can be increased, the assembling quality is reliable, the machining procedure can be reduced, the production cost can be reduced, and the production efficiency also can be improved.

Description

technical field [0001] The invention relates to an interference assembling method for a connecting rod bushing, in particular to an interference assembling method for an automobile powder metallurgy hot forging connecting rod and a copper-based bushing. Background technique [0002] Such as figure 1 As shown, most of the connecting rod 1 and the piston pin in modern engines are steel parts. The amount of anti-friction tin bronze bushing or iron-based powder metallurgy bushing 2 is pressed in to reduce wear and improve service life. Because the bushing 2 is installed, only the worn bushing 2 needs to be replaced during maintenance, which is economical and convenient. [0003] At present, traditional copper-based alloys and high-tin aluminum-based alloy bearings (AlSn20Cu) are widely used in high-speed and heavy-duty engine bearings in China. Among them, tin bronze materials are more researched and applied because of their advantages such as not easy to crack under high loa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K3/00B21J5/00
Inventor 刘福平
Owner 刘福平
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