Centrifugal casting process of tin-based bearing alloy

Abstract

The invention discloses a centrifugal casting process of a tin-based bearing alloy. The centrifugal casting process comprises the following steps that a tin liquid and a babbitt alloy liquid are prepare, tin is smelted at the temperature of 300-380 DEG C, and the tin-based babbitt alloy is smelted at 440-460 DEG C; a base body for casting is subjected to surface copper plating after heat treatment, machining and sand blowing; the base body is subjected to pre-treatment before the babbitt alloy is poured, whererin the pre-treatment comprises preheating, water washing and tin hanging; the pre-treated base body is quickly clamped into a centrifugal casting machine clamp, and a centrifugal machine is started and rapidly poured; a cast mold formed by combining the base body and the clamp is rotated at a preset rotating speed for 5 minutes, then stopping rotating, and a bearing alloy blank is taken out; and the bearing alloy blank is slowly cooled to the room temperature. According to the centrifugal casting process, the defective rate of gap defects or slag inclusion defects of the produced bearing alloy finished product is controlled within 5%, and the quality of the bearing alloy is close to zero. According to the centrifugal casting process, the tin-based bearing alloy which is compact in structure and free of gaps, pores and slag inclusion defects can be manufactured, and the yield and the productivity of the tin-based bearing alloy are improved.

Description

technical field [0001] The invention relates to a centrifugal casting process of a tin-based bearing alloy, in particular to a process suitable for producing a tin-based bearing alloy whose inner diameter is less than 60 mm. Background technique [0002] At present, although graphite bearings, air bearings and other new bearings have come out at home and abroad, Babbitt alloy, as a kind of anti-friction alloy with excellent performance, multi-use and proven practice, is still widely used in civil steam turbines, aviation and other fields. , Among them, tin-based babbitt alloy is usually cast on a low-carbon steel backing (in the inner hole of the matrix) because of its soft texture and low strength, and is used to manufacture tin-based bearing alloys (ie bimetallic alloys). Various versions of the centrifugal casting process for tin-based bearing alloys are commonly found in casting handbooks and professional journals, but in reality, producing high-quality bearing alloys th...

AI Technical Summary

Problems solved by technology

If technicians cannot fully grasp the essentials of the bearing alloy centrifugal casting process, casting defects such as pores and gaps will easily occur frequently when producing bearing alloys in batches and in large quantities, resulting in a large waste of non-ferrous metals and cost losses

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