Continuous steam treatment furnace for powder metallurgy product

Abstract

The invention discloses a continuous steam treatment furnace for a powder metallurgy product. The furnace comprises a frame (10), a mesh belt (7) on the frame (10) and a driving device (1) for driving the mesh belt (7) to operate, wherein the frame (10) is provided with a feed section (2), a preheating section (3), a black coating section (4) and a discharge section (5) through which the mesh belt (7) passes; the outlet end of the feed section (2) is connected with one end of the preheating section (3); the joint between the black coating section (4) and the preheating section (3) is provided with a hermetic air curtain; the other end of the preheating section (3) is connected with one end of the black coating section (4); the other end of the black coating section (4) is connected with the discharge section (5); and the black coating section (4) is connected with a steam generating device (9) and an atmosphere control device (6). The continuous steam treatment furnace can operate continuously, has high yield and low energy consumption, is easy to operate and convenient to maintain and can produce high-quality powder metallurgy products.

Description

technical field [0001] The invention relates to a continuous steam treatment furnace (commonly known as a blackening furnace) for powder metallurgy products. Background technique [0002] Water vapor treatment (blackening treatment) of powder metallurgy products is an important process to improve the surface wear resistance and corrosion resistance of powder metallurgy products. [0003] In view of the porosity properties of medium-density powder metallurgy products, water vapor treatment can be used to improve the wear resistance and corrosion resistance of the product surface. After treatment, the inner and outer surfaces of the product are covered with a layer of hard black magnetic iron oxide. This matte black oxide layer increases the wear and corrosion resistance of the article and provides a low reflective, aesthetically pleasing surface. After the powder metallurgy products are treated with water vapor, the surface hardness can be increased from HB 50-70 to HRB 50-...

AI Technical Summary

Problems solved by technology

[0005] 1. Neither of the two furnaces has the ability to clean the surface of the product before the product is blackened. The cleaning treatment and the blackening treatment are completed in the same furnace chamber, and the oil on the surface of the product is difficult to clean or cause secondary pollution, resulting in A uniform and dense oxide film cannot be formed on the surface of the product, and the product quality is very unstable

[0006] 2. The well-type steam treatment furnace can only operate intermittently, not continuous production, low production capacity and high energy consumption

[0007] 3. Use a conventional mesh-belt heat treatment furnace for water vapor treatment. Usually, water vapor is directly introduced from the discharge section of the furnace. The water vapor pressure in the furnace is low, and the water vapor can only penetrate into the shallow surface layer of the product, forming a very thin oxide film. Thin, the quality of the product is poor

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