A kind of preparation method of high-strength piston pin hole bushing

Abstract

A preparation method of a high-strength piston pin hole bushing, the steps: by weight percentage 28.5-33.5% Zn, 1.5-2.5% Mn, 0.8-1.5% Al, 0.6-1.2% Ni, 0.7-1.3% Si, the rest is Cu, for batching. Copper, zinc, aluminum and silicon are added in the form of pure copper, pure zinc, pure aluminum and pure silicon; manganese and nickel are added in the form of CuMn30 copper-manganese master alloy and CuNi15 copper-nickel master alloy; pure copper, pure zinc, pure aluminum, pure Add silicon, copper-manganese alloy and copper-nickel alloy into the smelting furnace to melt and fully stir; carry out horizontal continuous casting of molten copper to obtain a rough ingot; use the copper tube ingot obtained after horizontal continuous casting as a spinning blank, Spinning is carried out in reverse rotation mode, and the rollers are installed with a pair of double-cone rollers at staggered distances. The gap between the mandrel and the rollers is 4-8mm, the feed ratio is 0.5-1mm / r, and the temperature is 150-250°C. ;Machining. The preparation method of the invention has simple procedures and is easy to operate, and the prepared piston pin hole bushing has high strength and low cost, can meet the use requirements of the piston pin seat, improve its fatigue resistance, and effectively avoid pin seat failure.

Description

technical field [0001] The invention relates to a preparation method of a piston pin hole bushing, in particular to a preparation method of a high-strength piston pin hole bushing. Background technique [0002] The piston pin hole bushing is one of the key parts of the engine. It is inserted in the piston pin hole with an interference fit and has a clearance fit with the piston pin. It is used to reduce the contact stress on the surface of the piston pin hole and improve the reliability of the pin hole. Due to the continuous high-frequency alternating stress during high-temperature operation, the working conditions of the bushing are extremely harsh. Therefore, the bushing material needs to have good hardness, strength and fatigue resistance. [0003] At present, domestic engine piston pin hole bushings are mainly made of copper alloys such as tin bronze and phosphor bronze, which are relatively expensive, and the forming methods are mostly solid bar machining or machining ...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic engine piston pin hole bushings are mainly made of copper alloys such as tin bronze and phosphor bronze, which are relatively expensive, and the forming methods are mostly solid bar machining or machining after forging. higher

Moreover, the performance of the prepared piston bush is 540MPa at room temperature, and the Brinell hardness is about 170HB, which is far from that of the imported piston bush.

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