Aluminum-zinc-silicon-lead alloy for thin-wall bearing bush and alloy sheet preparation method

Abstract

The invention relates to an aluminum-zinc-silicon-lead alloy for a thin-wall bearing bush, which comprises the following chemical components in percentage by weight: 4.2-5.3% of Zn, 1.2-1.9% of Si, 0.9-1.3% of Cu, 0.01-0.65% of Mg, 0.60-1.3% of Pb, 0.01-0.3% of Ti, less than or equal to 0.05% of Fe, less than or equal to 0.05% of single content of other impurity elements, less than or equal to 0.15% of total content of the impurity elements and the balance of Al, a method for preparing an alloy sheet according to the aluminum-zinc-silicon-lead alloy comprises the following steps of: carrying out homogenizing annealing treatment on an alloy ingot blank, and machining to remove surface defects; and performing hot rolling and cold rolling. The performance of the aluminum-zinc-silicon-lead alloy is improved, the cold-rolled alloy sheet with the hardness larger than or equal to HV80 can be prepared by means of reasonable design of alloy components, optimization of the heat treatment technology, adjustment of the rolling technology and the like, the defects of opening, edge cracking, bulging and the like easily occurring in the sheet rolling process are effectively overcome, the internal quality of the alloy sheet is guaranteed, and the service life of the alloy sheet is prolonged. And the material selection requirement of thin-wall bearing bush localization on alloy materials can be met.

Description

technical field [0001] The invention relates to the field of thin-walled bearing pad alloy materials, in particular to an aluminum-zinc-silicon-lead alloy and an alloy thin plate preparation method for thin-walled bearing pads. Background technique [0002] The force exerted by the journal bearing the bearing pad is called the "fuse" of the engine. When the load is too large, the temperature is too high, the lubricating oil has impurities and viscosity abnormalities, etc., the bearing pad will burn the bearing pad to protect the engine from badly damaged. Sliding bearing materials are materials for manufacturing bearing bushes, bushings and other parts, which are friction couples that directly cooperate with shafts or journals. Sliding bearing materials must have good antifriction, wear resistance, embedding, compliance, corrosion resistance and sufficient bearing capacity to reduce friction and wear and prolong the service life of the bearing. [0003] Existing thin-walle...

AI Technical Summary

Problems solved by technology

At present, the performance of the existing thin-walled bearing alloy materials in my country is insufficient, and the preparation process is not mature enough, resulting in the heavy dependence of aluminum alloy bearings for high-speed diesel engines on imports. Therefore, it is of great significance to realize the independent guarantee of domestic bearing materials.