Process method for manufacturing balance weight for compressor by powder metallurgy

Abstract

The invention discloses a process method for producing a balance weight for a compressor by powder metallurgy, which comprises the steps that: (1), raw materials comprising Mn (17-25%), C (0.5-1.5%) and Fe (the rest) are uniformly blended to produce raw material powder required by production; (2), the raw material powder is put into a mechanical press (or four-column hydraulic press) for compression moulding so as to obtain a pressing compact for the balance weight; (3), the pressing compact for the balance weight is put into a continuous mesh belt furnace (or push rod furnace) for sintering to obtain a sintering compact for the balance weight; and (4), the sintering compact for the balance weight is subjected to shot blasting treatment to obtain a finished product of the high manganese steel weight balance for the air compressor. According to the production method disclosed by the invention, the stability of the sizes of workpieces is good, no impurity is generated, the quality of the surface is excellent, and the components are uniform and stable; the weight variation among products of different batches is small and can be controlled within 1%; no oxidation is generated in the production process, the internal organization of metal is excellent, the crystalline grain is finer, and the bad organizations such as coarse crystal and mixed crystal can be avoided.

Description

technical field [0001] The invention relates to a method for manufacturing an air-conditioning compressor balance block, in particular to a manufacturing process for a high-manganese steel balance block used for an air-conditioning compressor. [0002] Background technique [0003] The function of the balance weight of the air conditioner compressor is: when the piston of the air conditioner compressor moves up and down, the balance weight controls the crankshaft to move back and forth, and maintains the smooth operation of the motor; the balance weight is required not to be magnetized in an alternating current environment, not to generate a magnetic field, and not to form Magnetic force, that is, the balance weight is non-magnetic. [0004] In the prior art, there are three types of balance weights for air conditioner compressors: copper, zinc, and non-magnetic steel. Typical structures are as follows: figure 1 , 2 As shown, the non-magnetic steel balance weight is usua...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are three types of balance weights for air conditioner compressors: copper, zinc, and non-magnetic steel. Typical structures are as follows: figure 1 , 2 As shown, the non-magnetic steel balance weight is usually made by precision casting, and the shortcomings of the precision casting process are mainly: 1. The size of the casting is unstable and the deviation is serious; 2. There are iron beans and sand in the hole; 3. The surface quality of castings is poor, and the main beneficial surface has more honeycomb pores; 4. The composition is not easy to control; 5. High scrap rate and high energy consumption

Although this kind of investment casting process has been improved many times, the above defects are still difficult to be reliably solved.

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