High manganese steel balance weight for frequency conversion compressor and manufacturing method thereof

Abstract

The invention discloses a high manganese steel balance block for frequency conversion compressor and a manufacturing method thereof. The balance block is made of high manganese steel, and the weight ratio of each element in the high manganese steel is: C0.2%~1.5%, Mn13 ~25%, S≤0.1%, P≤0.1%, Si≤1%, Cr≤5%, Ni≤2%, Fe balance, the balance weight of the compressor is made by investment casting process, which can effectively guarantee the shape of the product And the size, especially the composition is controllable, the batch production capacity is large, and the production cost of the compressor balance block is effectively reduced.

Description

technical field [0001] The invention relates to a balance weight for a variable frequency compressor; the invention also relates to a manufacturing method for a balance weight for a frequency conversion compressor. Background technique [0002] The balance weight is an important part of the compressor. For a long time, the material of the balance weight in the inverter compressor industry has been made of brass (copper-zinc alloy) because it is a non-magnetic material with high density and good plasticity. However, due to the shortage of non-ferrous metal resources, the price is too high and the vibration is violent, which affects the production of the inverter compressor balance weight, resulting in high production costs. Moreover, the lead element in the copper alloy is harmful to the human body and the environment, and has been listed as a restricted substance by the European Union. [0003] The production of traditional copper alloys generally adopts gravity casting (or...

AI Technical Summary

Problems solved by technology

The balance weight made of high manganese steel with a manganese content between 11.0% and 14.0% cannot meet the requirements of the inverter compressor balance weight, so the high manganese steel with a manganese content between 11.0% and 14.0% The material is not suitable for the production of the balance weight of the inverter compressor

[0005] Application number 200710145503.8 discloses a non-magnetic alloy for making balance weights in Chinese patent application, which consists of 5-20% manganese, 5-20% chromium, 0.05-1.5% sulfur, 0.4-3% copper, 0 ~1.5% nickel, carbon ≤ 0.15%, silicon ≤ 1%, phosphorus ≤ 0.05%, and the balance of iron and trace impurity elements. Due to the excessive types and proportions of alloying elements in this formula, the overall cost of the balance block Too high, too many types of elements have high requirements for the quality control of the balance weight, the lead element in the copper alloy is harmful to the human body and the environment, and has been listed as a restricted substance by the European Union

The forging process is inconvenient to process the right angle position and the water chestnut position of the balance weight, and it is easy to have material shortage, trimming and raised defects; in addition, the hot rolling and cold drawing processing process, the processed products are prone to cracks, pits, out-of-tolerance dimensions, wall Uneven thickness, inclusions and other defects, such defects will affect the performance of the compressor, and the quality is difficult to guarantee