Powder metallurgy technical formula and technical process thereof

Abstract

The invention discloses a powder metallurgy technical formula and a technical process thereof. The formula is iron-base powder formed by uniformly mixing graphite powder, copper powder, zinc stearate and iron powder. The forumula is characterized in that ferrophosphorus alloy and manganese sulfate are added to the iron-base powder; and the iron-base powder comprises the following components in percentage by weight: 0.4-1.5% of graphite powder, 1-3% of copper powder, 1-2.5% of manganese sulfide, 1-2.5% ferrophosphorus alloy, 0.5-1% of zinc stearate and 70-98% of iron powder. The technical process comprises the following steps: (1) mixing; (2) compacting; (3) sintering; (4) oil immersing; (5) finishing; (6) rough processing; (7) fine processing; and (8) rust-proofing treatment. The invention replaces electrolytic copper with ferrophosphorus alloy, thereby enhancing the performance and the strength of the product, reducing the manufacturing cost, enhancing the production efficiency and having the advantages of strong wear resistance, short sintering time and stable quality.

Description

technical field [0001] The invention relates to a metallurgical process, in particular to a powder metallurgy formulation and a process flow thereof. Background technique [0002] Powder metallurgy is a processing method for preparing metal powder and making the mixture of metal powder or non-metal powder into products through forming and sintering processes. It can not only produce special materials that are difficult to produce by ordinary smelting methods, but also manufacture various A kind of precision mechanical parts, saving labor and materials. However, the cost of the mold and metal powder is relatively high, and it should not be used when the batch size is small or the product size is too large. [0003] Generally, the powder metallurgy process used in the society usually goes through the processes of material mixing-stirring molding-sintering-shaping-secondary sintering-mechanical processing-heat treatment-oscillating grinding-vacuum oil immersion and so on. As ...

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Problems solved by technology

[0005] 1. The production cost is high; the electrolytic copper powder in the market is about 80,000 yuan / ton, and the price is high, which increases the production cost for the enterprise

[0006] 2. Copper powder is prone to deformation during sintering, which affects the performance and strength of the product

[0007] 3. It usually takes 20 minutes to sinter the conduit with electrolytic copper as the main formula, and the sintering time in the electric furnace is relatively long, which reduces the production efficiency

[0008] Therefore, the existing formula and process of powder metallurgy still have limitations, poor adaptability to special process requirements, and need further improvement

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