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Production method of iron-based premixed powder for engine rotor

A production method and technology of pre-mixed powder, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of poor consistency of rotor strength, many types of alloy materials, poor fluidity of mixed powder, etc., to achieve consistent size and consistency High performance and stable performance

Active Publication Date: 2020-12-11
山东鲁银新材料科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing method for preparing iron-based premixed powder for engine rotors uses pure iron powder as the base powder, and adds nickel powder, copper powder, molybdenum iron powder, graphite , cutting aids and lubricants are prepared by direct mixing method. This method has many types of alloy materials added, which requires high mixing technology, and is prone to element segregation, which makes the consistency of the rotor in terms of strength and precision worse. Mixing at the same time Poor fluidity of powder

Method used

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  • Production method of iron-based premixed powder for engine rotor
  • Production method of iron-based premixed powder for engine rotor
  • Production method of iron-based premixed powder for engine rotor

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 A kind of production method of iron-based premixed powder for engine rotor

[0026] Described production method is stirring type direct mixing method; Concrete steps are as follows:

[0027] (1) Feeding

[0028] Add the base powder and auxiliary materials prepared in advance according to the ingredient list into the BR-71 high specific gravity powder flexible mixer. The order of feeding is first to add half of the base powder, then cutting agent, graphite, lubricant, and then add the other half of the base powder;

[0029] The mass ratio of the base powder, graphite, cutting agent and lubricant is: 98.15:0.75:0.4:0.70;

[0030] The base powder: LAP100.29D1 (alloyed with three elements of nickel, molybdenum and copper), diffusion alloy steel powder, produced by Laiwu Iron and Steel Group Powder Metallurgy Co., Ltd.;

[0031] The cutting agent, the model is T-1 cutting agent, the active ingredient is CaF, produced by Guangzhou Qingfanxiang New Material Co.,...

Embodiment 2

[0049] Taking the most widely used Fe-C-Cu series iron-based powder metallurgy material as an example, the company's self-produced water atomized pure iron powder LAP100.29 is used as the base powder, and the 200-mesh copper produced by Beijing Youyan Powder New Material Co., Ltd. The powder FTD-3 and the graphite F10 of Swiss Temigo are alloying element powders, and the lubricants are W-special, E-206, SUW-5000B, MP32, SKZ-600, Lubricant-C-wax, SKZ-320 respectively, according to With the same ratio of Fe+0.8%C+2.0%Cu+0.8%Lub, 7 experiments were carried out using the direct mixing method. Three samples were taken for each batch of finished products, and the loose ratio, fluidity, compressibility, and demoulding force were tested respectively, and the average value was taken. The results are shown in Table 2.

[0050] Table 2: Test results of physical properties of mixed powders using different lubricants

[0051]

[0052] Analysis of Table 2 shows that when using the same ...

Embodiment 3

[0059] When using the direct mixing method, the phenomenon of poor product flow performance and low loose ratio often occurs in winter.

[0060] The temperature difference between winter and summer in northern my country is 50 ℃ ~ 60 ℃. Such a huge temperature difference can easily make the lubricant itself agglomerate and difficult to separate during the direct mixing process. White spots that can be recognized by the naked eye appear in the mixed powder, which is reflected in In quality, the flow performance becomes poor due to the low loose ratio.

[0061] The properties of the mixed powders prepared at different mixing temperatures are shown in Table 4.

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Abstract

The invention provides a production method of iron-based premixed powder for an engine rotor. The mixed powder comprises the following components: base powder LAP100.29D1, graphite, a cutting agent and a lubricant. According to the prepared mixed powder, the apparent density is 3.1-3.15 g / cm<3>, the fluidity is 31.5-32 sec / 50 g, and the compressibility is 7.01-7.05 g / cm<3>. Diffusion type alloy steel powder serves as the base powder, the graphite and the cutting aid are added, and the uniformity of alloy components such as copper, nickel and molybdenum is guaranteed while a sintered product obtains enough high pressing performance. The performance of a sintered blank prepared from the mixed powder is that the size change rate is within -0.1%, the expansion rate ranges from -0.035 to -0.038%, the ductility is 1.3-1.33%, the tensile strength is 550-555 MPa, and the yield strength is 415-418 MPa.

Description

technical field [0001] The invention relates to a production method of iron-based premixed powder for engine rotors, and belongs to the technical field of materials for engine rotors. Background technique [0002] The rotary engine converts the combustion expansion force of the combustible gas into the driving torque. Compared with the reciprocating engine, it saves the useless linear motion. Therefore, the rotary engine with the same power is small in size, light in weight, low in vibration and noise, and has a large Advantage. The engine fuel pump rotor produced by powder metallurgy method is the most typical high-end powder metallurgy product, which has the advantages of high production efficiency, low cost, long wear-resistant life and good stability. [0003] The existing preparation method of iron-based premixed powder for engine rotors uses pure iron powder as the base powder, and is prepared by direct mixing method by adding nickel powder, copper powder, molybdenum ...

Claims

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Application Information

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IPC IPC(8): B22F1/00
CPCB22F1/10
Inventor 李霆李普明卞新龙于永亮吴琼丁东升张金岭马中锋王瑞芳吴德源
Owner 山东鲁银新材料科技有限公司
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