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A processing method for the horizontal hole of the powder metallurgy compressor cylinder block

A compressor cylinder block and processing method technology, which is applied in the field of powder metallurgy, can solve the problems of large cutting amount of cross holes, short tool life, high processing cost, etc., and achieve the goal of improving processing speed and tool life, low cost and fast processing speed Effect

Active Publication Date: 2019-05-14
NBTM NEW MATERIALS GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As one of the main methods of manufacturing rotary compressors, powder metallurgy has the characteristics of high production efficiency and high material utilization rate. However, due to the limitation of its process characteristics, the vertical hole can only be formed at one time during the forming process. Cross holes such as spring holes and air holes can only be obtained by additional machining
At present, the processing of the horizontal hole of the cylinder body is carried out after sintering. At this time, the material has formed a metallurgical bond, the strength is high, and the cutting amount of the horizontal hole is large, resulting in slow processing speed, short tool life and high processing cost.

Method used

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  • A processing method for the horizontal hole of the powder metallurgy compressor cylinder block
  • A processing method for the horizontal hole of the powder metallurgy compressor cylinder block
  • A processing method for the horizontal hole of the powder metallurgy compressor cylinder block

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Experimental program
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Effect test

Embodiment 1

[0024] 1. Raw material ratio: the material of the cylinder is Fe-0.8wt%C, 0.8wt% graphite powder, 0.3wt% green body strengthening agent, 0.7wt% lubricant, 40wt% atomized iron powder, and the balance of reduced iron The powder is mixed evenly by bonding and mixing.

[0025] 2. Forming: the mold is heated to 70°C, and then warm molded, the forming pressure is 700Mpa, the density is 6.60±0.05g / cm 3 , Green strength 18 ~ 23MPa.

[0026] 3. Green body machining and drilling: machine the prepared green body to obtain air hole A and spring hole B. Design special fixtures such as figure 2 As shown, the green parts are fixed, and the fixture includes a sliding block 2, a positioning pin 1, a protrusion 4 and a clamping block 3, and the positioning pin 1 corresponds to the lower positioning hole of the cylinder body, and the sliding block 2, the protrusion 4 and the clamping block The blocks 3 all play the role of auxiliary support, which helps to reduce the vibration of the product ...

Embodiment 2

[0029] 1. Raw material ratio: the material of the cylinder is Fe-0.7wt%C-1.5wt%Cu, 0.7wt% graphite powder, 1.5wt% copper powder, 0.4wt% green body strengthening agent, 0.2wt% lubricant , The remaining atomized iron powder is mixed evenly by bonding and mixing.

[0030] 2. Forming: Forming at room temperature, forming pressure 700Mpa, density 7.00±0.05g / cm 3 , Green strength 20 ~ 25MPa.

[0031] 3. Green body processing and drilling: machining the prepared green body to obtain air holes and spring holes. The fixture structure is similar to Example 1. The processing parameters are: the feed rate when entering the tool is 20mm / min, the tool rotation speed is 5000 rpm, and after the tool enters the substrate 1mm, the feed rate becomes 40mm / min, and the tool rotation rate becomes 4000 rpm. After processing, the pores around the product are smooth without peeling off, no cracks are found in metallographic examination, and the roughness of the pore wall after sintering is Ra1.2. ...

Embodiment 3

[0033] 1. Raw material ratio: the material of the cylinder is Fe-0.4wt%C, 0.4wt% graphite powder, 0.2wt% green body strengthening agent, 0.5wt% lubricant, and the balance is reduced iron powder, using conventional rotation Mixing method Mix well.

[0034] 2. Forming: the mold is heated to 80°C, and then warm molded, the forming pressure is 600Mpa, the density is 6.50±0.05g / cm 3 , Green strength 18 ~ 23MPa.

[0035] 3. Green body processing and drilling: machining the prepared green body to obtain air holes and spring holes. The fixture structure is similar to Example 1. The processing parameters are: the feed rate when entering the tool is 25mm / min, the tool rotation speed is 8000 rpm, and after the tool enters the substrate 1mm, the feed rate becomes 50mm / min, and the tool rotation rate becomes 6000 rpm. After processing, the pores around the product are smooth without peeling off, no cracks are found in metallographic examination, and the roughness of the pore wall after ...

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Abstract

A powder metallurgy air-conditioning compressor cylinder horizontal hole processing method, the steps: mixing raw materials in proportion: C: 0.4wt% ~ 0.9wt%, Cu: 0 ~ 3wt%, lubricant: 0.2 ~ 0.8wt%, The green body reinforcement is 0.1-0.5wt%, and the balance is iron powder. After forming, the green body is drilled and machined. The green body strength needs to be greater than 15MPa. When drilling, the green body is fixed on a specific fixture, and a specific Tool for processing. Before the powder metallurgy cylinder is sintered, the air hole and spring hole are processed in the green state, and at the same time, a specific processing tool is used for machining. The processed cylinder has no cracks, and has the advantages of simple process, fast processing speed and relatively low cost. The low profile solves the problems of high cylinder strength and slow drilling speed after sintering, and greatly improves the processing rate and tool life.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a method for preparing a cylinder body of a powder metallurgy compressor, in particular to a method for processing a horizontal hole of a cylinder body of a powder metallurgy compressor. Background technique [0002] Rotary compressors are widely used in household air conditioners, with an annual output of more than ten million units. The rotary compressor is composed of main parts such as piston, cylinder block, vanes and the spring on the back, eccentric crankshaft, upper and lower cylinder heads, etc. The cylinder block is the skeleton of the compressor, on which are installed the main components of the compressor, supporting The eccentric crankshaft rotation mechanism ensures the correct mutual position of the moving parts; it supports the upper and lower cylinder heads and other fixed parts to form sealed high and low pressure air chambers and air flow channels. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F1/00
CPCB22F3/162B22F1/10
Inventor 冯伟立潘中晨包崇玺赵万军
Owner NBTM NEW MATERIALS GRP
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