A preparation method of compressor valve plate powder metallurgy

Abstract

The invention discloses a powder metallurgy preparation method of a compressor valve plate. The compressor valve plate comprises, by weight percent, 0.2-0.6% of graphite, 0.2-0.4% of chromium, 0.4-0.6% of manganese, 0.2-0.4% of nickel, 0.2-0.4% of quartz sand powder, 0.8-1% of aluminum, 1-2% of copper, 1-1.2% of modifier and the balance of iron. By the added modifier, ultrafine powder is provided in mixed raw materials, the ultrafine powder can be filled in gaps amount large particles, and apparent density of the mixed raw materials is increased. The ultrafine powder mainly comprises nano silicon dioxide and calcium stearate. The novel modifier obtained by modifiers such as silane coupling agents further increases physical indexes such as wear resistance of products. Polyethylene vinyl acetate and liquid paraffin which serve as lubricants are added to the modifier to increase hybrid pressing effect of the modifier, pressing strength, at the same pressing pressure, of powder metallurgy components is increased greatly, particle combination forms and pore shapes of raw materials are changed, and cracks are solved fundamentally.

Description

technical field [0001] The invention mainly relates to a powder metallurgy preparation method for a valve plate of a compressor, which belongs to the field of casting. Background technique [0002] With the continuous development of my country's economy, powder metallurgy structures are used more and more widely. As a near net shape technology, powder metallurgy has great economic advantages in the production of structural parts and other parts with large batches, high dimensional accuracy and high processing costs. However, there is a weakness in powder metallurgy structural parts: the compact strength of the product before sintering is very low, which leads to cracks easily appearing during the forming and handling process, and cannot be detected during the manufacturing process. This is a fatal defect in some applications such as key parts of automobiles, which leads to the application of powder metallurgy structural parts only to low- and medium-risk stress-bearing part...

AI Technical Summary

Problems solved by technology

The material composition affects the manufacturing cost, the product density has a great influence on the loss of the molding machine and the mold, and the crack is mainly affected by the strength of the compact, and it is difficult to detect