Preparation method for powder metallurgy aluminum alloy connection rod used for compressor

A powder metallurgy and aluminum alloy technology is applied in the field of preparation of powder metallurgy aluminum alloy connecting rods for compressors. The material group allocation ratio is scientific and reasonable, and the effect of improving efficiency

Active Publication Date: 2016-06-29
NBTM NEW MATERIALS GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with aluminum-based materials, iron-based materials have higher mechanical properties and can work under higher loads, but it is difficult to produce parts with uniform density and high density (>90% theoretical density), and the thermal conductivity of iron is relatively Poor, must use coolant during machining
In the case of incomplete surface sealing treatment, the coolant will seep into the connecting rod matrix and gradually overflow during use
The aging of the overflowed coolant will cause abnormal matching of parts or lubrication, resulting in abnormal operation of the compressor, such as increased noise, abnormal pressure, etc., or even shutting down directly

Method used

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  • Preparation method for powder metallurgy aluminum alloy connection rod used for compressor
  • Preparation method for powder metallurgy aluminum alloy connection rod used for compressor
  • Preparation method for powder metallurgy aluminum alloy connection rod used for compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Mixing: the chemical composition of the connecting rod is Cu: 4.5wt%, Mg: 1.2wt%, Si: 0.7wt%, Zn: 0.1wt%, Sn: 0.1wt% (mass fraction), and the particle size of 4.5wt% 325 mesh electrolytic copper powder, 2.8wt% Al-25Si alloy powder with a particle size of 500 mesh, 2.4wt% Al-50Mg alloy powder with a particle size of 100 mesh, 0.1wt% zinc powder with a particle size of 200 mesh, and 0.1wt% particle size of 200 mesh Tin powder, 1.4wt% lubricant, 88.7wt% 100-mesh aluminum powder are placed in a double-cone mixer and mixed for 45 minutes. The powder used is as follows figure 2 shown.

[0036] 2. Forming: use the mixed powder to form on the forming press according to the requirements of the drawings, the forming pressure is 150-400MPa, and the forming density is 2.60±0.05g / cm 3 .

[0037] 3. Dewaxing-sintering: The green body is continuously dewaxed and sintered in a mesh belt furnace. The protective atmosphere in the whole process is pure nitrogen, and the dew point is...

Embodiment 2

[0046] 1. Mixing: the chemical composition of the connecting rod is Zn: 5.8wt%, Mg: 2.5wt%, Cu: 1.6wt%, Si: 0.2wt%, Sn: 0.1wt% (mass fraction), and 97.6wt% 100 mesh Al-5.8%Zn-2.5%Mg-1.6%Cu (mass fraction) pre-alloyed powder, 0.8wt% Al-25Si alloy powder, 0.1wt% tin powder, 1.5wt% lubricant, placed in double cone In a mixer, mix for 30 minutes.

[0047] 2. Forming: use the mixed powder to form on the forming press according to the requirements of the drawings, the forming pressure is 450-600MPa, and the forming density is 2.55±0.05g / cm 3 .

[0048] 3. Dewaxing: The green body is rapidly heated to 420°C and held for 30 minutes, the protective atmosphere is pure nitrogen, the nitrogen dew point is ≤ -30°C, and the residual carbon content after dewaxing is ≤0.05%.

[0049] 4. Heat the dewaxed product to 605°C, keep it warm for 30 minutes, the protective atmosphere is pure nitrogen, the nitrogen dew point is ≤ -45°C, and the sintered density is 2.75±0.05g / cm 3 .

[0050] 5. Shap...

Embodiment 3

[0057] 1. Mixing: the chemical composition of the connecting rod is Cu: 3.0wt%, Mg: 1.0wt%, Si: 1.0wt%, Zn: 0.1wt%, Sn: 0.6wt% (mass fraction), and the particle size of 6.0wt% 325 mesh Al-50Cu alloy powder, 4wt% Al-25Si alloy powder with particle size of 500 mesh, 2.0wt% Al-50Mg alloy powder with particle size of 100 mesh, 0.1wt% zinc powder with particle size of 200 mesh, 0.6wt% particle size of 200 mesh Target tin powder, 1.5wt% lubricant, and 85.8wt% 100-mesh aluminum powder were placed in a double-cone mixer and mixed for 45 minutes.

[0058] 2. Forming: use the mixed powder to form on the forming press according to the requirements of the drawings, the forming pressure is 450-600MPa, and the forming density is 2.55±0.05g / cm 3 .

[0059] 3. Dewaxing: The green body is rapidly heated to 420°C and held for 30 minutes, the protective atmosphere is pure nitrogen, the nitrogen dew point is ≤ -30°C, and the residual carbon content after dewaxing is ≤0.05%.

[0060] 4. Sinterin...

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Abstract

Disclosed is a preparation method for a powder metallurgy aluminum alloy connection rod used for a compressor. The preparation method comprises the steps that the aluminum alloy connection rod comprises the chemical components of 0.1wt%-7wt% of Cu, 0.1wt%-3wt% of Mg, 0.1wt% -6wt% of Si, 0.1wt%-8wt% of Zn, 0.02wt%-2wt% of Sn, less than 2wt% of other refined grain auxiliaries, and the balance Al; powder containing Al, Cu, Mg, Si, Zn and Sn elements is mixed, the mixed powder is subjected to die pressing forming at the pressure of 100-600 MPa to obtain green-pressing, and the forming density is 2.30-2.65 g / cm<3>; dewaxing treatment and sintering treatment are conducted; heat treatment is conducted; reshaping is conducted; sand blasting or brushing treatment is conducted; and machining is conducted, and the product size is made to meet the requirements of a drawing. The preparation method is simple in preparation process and has the characteristics of being small in machining quantity and high in material utilization ratio. The production cost is reduced, and the production efficiency is improved. The produced connection rod is scientific and reasonable in material component ratio, high in tensile strength, and good in abrasion resistance. Optimization of the design of the compressor is facilitated, the efficiency of the compressor is improved, and the preparation method is suitable for large-batch efficient production.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a method for preparing a powder metallurgy aluminum alloy connecting rod for a compressor. Background technique [0002] The function of the connecting rod in the compressor is to connect the crankshaft and the piston and transmit force, and convert the circular motion of the crankshaft into the linear reciprocating motion of the piston. The main production methods of connecting rods are forging, powder metallurgy, and casting. The mechanical properties of forging are the highest, while casting is the lowest, and the powder metallurgy method is in the middle. Compared with forging and casting, powder metallurgy has the advantages of less machining, high dimensional accuracy, uniform structure, less segregation and inclusions, and high production efficiency. At present, powder metallurgy connecting rods are mainly made of iron-based materials. Compared with aluminum-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F1/00C22C21/00
Inventor 柳睿周国燕包崇玺毛增光
Owner NBTM NEW MATERIALS GRP
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