Method for manufacturing check valve core by powder metallurgy

Abstract

The invention discloses a method for manufacturing a check valve core by powder metallurgy. The method includes steps of a, preparing a mixed material: using electrolytic iron powders as base materials, and mixing the electrolytic iron powders with other components of, by weight, 35%-40% of scrap steel powders, 5%-6% of recirculated iron powders, 3.5%-3.8% of manganese powders, 0.4%-0.5% of molybdenum powders, 0.3%-0.5% of chromium powders, 0.3%-0.5% of molybdenum disulfide powders, 0.8%-1.1% of waste aluminum powders, 1.8%-2.0% of graphite and 1.5%-2.0% of stearic acid which is smaller than 45 microns; and b, performing pressing molding: feeding the evenly mixed powder metallurgy material to a press machine, and performing the pressing molding by means of a mold to form the check valve core. The method for manufacturing the check valve core by the powder metallurgy is high in production continuity, high in material utilization, suitable for volume-producing and capable of reducing costs.

Description

technical field [0001] The invention relates to a method for preparing a check valve core, in particular to a powder metallurgy preparation method for a check valve core. Background technique [0002] At present, the domestic spherical check valve cores are all made of ordinary high-speed steel materials, or stainless steel materials are machined into spherical check valve cores. The processing speed is slow and the material utilization rate is not high. However, the globe valve manufactured by powder metallurgy process not only has high material utilization rate, but also is suitable for mass production. A small amount of fine grinding of powder metallurgy valve body is required before assembly and use. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a powder metallurgy preparation method for a check valve core with high production efficiency and low manufacturing cost, aiming at the current technical situation ...

AI Technical Summary

Problems solved by technology

The processing speed is slow and the utilization rate of materials is not high. However, the globe valve manufactured by powder metallurgy process not only has high material utilization rate, but also is suitable for mass production. Before assembly and use, a small amount of fine grinding of powder metallurgy valve body is required.