Powder metallurgy automotive oil pump internal and external rotors and manufacturing method thereof

Abstract

The invention discloses powder metallurgy automotive oil pump internal and external rotors. The powder metallurgy automotive oil pump internal and external rotors are characterized by being manufactured from, by weight, 75-78 parts of iron powder, 7.5-7.8 parts of nickel, 0.5-0.8 part of graphite powder, 3.1-3.4 parts of copper, 9.2-9.6 parts of molybdenum, 0.3-0.5 part of manganese sulfide, 2.5-2.8 parts of paraffin, 8.3-8.7 parts of Cr, 0.4-0.6 part of Sb, 1.3-1.4 parts of Bi, 3.2-3.4 parts of Ti and 2-3 parts of auxiliaries. According to the powder metallurgy automotive oil pump internal and external rotors, the auxiliaries are added, and therefore the alloy powder is scattered evenly, the longitudinal and transverse evenness of the internal structural organization of the products is guaranteed, and the fatigue life of the products is prolonged; besides, the powder metallurgy automotive oil pump internal and external rotors are high in strength, good in impact toughness, high in hardness, and good in abrasion resistance and cutting performance.

Description

technical field

[0001] The invention relates to the field of powder metallurgy, in particular to an inner and outer rotor of an automobile oil pump by powder metallurgy and a preparation method thereof. Background technique

[0002] The inner and outer rotors of the oil pump are used in automobile engines. The tooth shape of this set of rotors is complex and the dimensional accuracy is high. According to the drawings provided by customers and the requirements for use and assembly, general turning technology cannot meet them. The tooth shape of the existing inner rotor is relatively sharp, and the top of the tooth is very narrow, which is easy to be worn during use, resulting in engine failure. Therefore, the present invention provides a method for manufacturing the inner and outer rotors of the oil pump by using the powder metallurgy process. The inner and outer rotors of the oil pump produced by the method have high tooth strength, long service life, short processing time a...

Examples

Embodiment Construction

[0016] specific implementation plan

[0017] The present invention will be described in detail below through specific examples.

[0018] A powder metallurgy automobile oil pump internal and external rotor, made of the following raw materials in parts by weight (kg): iron powder 75, nickel 7.5, graphite powder 0.5, copper 3.1, molybdenum 9.2, manganese sulfide 0.3, paraffin 2.5, Cr 8.3, Sb 0.4, Bi 1.3, Ti 3.2, additive 2;

[0019] The auxiliary agent is made of the following raw materials in parts by weight (kg): iron powder 30, kaolin 2, alum 1, nano-carbon 1, polyisobutylene 2, aluminate coupling agent DL-411 1, sodium tripolyphosphate 2. Ricinoleic acid 1, aluminum nitride powder 2; the preparation method is to mix iron powder, kaolin, alum, and sodium tripolyphosphate, grind it into 200-300 mesh powder, and then add aluminate coupling agent DL-411 to mix Uniform, pressed into a blank at 10-15Mpa, then sent to 920-950°C for calcination for 3-4 hours, after cooling, crushed...

technical field

[0001] The invention relates to the field of powder metallurgy, in particular to an inner and outer rotor of an automobile oil pump by powder metallurgy and a preparation method thereof. Background technique

[0002] The inner and outer rotors of the oil pump are used in automobile engines. The tooth shape of this set of rotors is complex and the dimensional accuracy is high. According to the drawings provided by customers and the requirements for use and assembly, general turning technology cannot meet them. The tooth shape of the existing inner rotor is relatively sharp, and the top of the tooth is very narrow, which is easy to be worn during use, resulting in engine failure. Therefore, the present invention provides a method for manufacturing the inner and outer rotors of the oil pump by using the powder metallurgy process. The inner and outer rotors of the oil pump produced by the method have high tooth strength, long service life, short processing time a...

Examples

Embodiment Construction

[0016] specific implementation plan

[0017] The present invention will be described in detail below through specific examples.

[0018] A powder metallurgy automobile oil pump internal and external rotor, made of the following raw materials in parts by weight (kg): iron powder 75, nickel 7.5, graphite powder 0.5, copper 3.1, molybdenum 9.2, manganese sulfide 0.3, paraffin 2.5, Cr 8.3, Sb 0.4, Bi 1.3, Ti 3.2, additive 2;

[0019] The auxiliary agent is made of the following raw materials in parts by weight (kg): iron powder 30, kaolin 2, alum 1, nano-carbon 1, polyisobutylene 2, aluminate coupling agent DL-411 1, sodium tripolyphosphate 2. Ricinoleic acid 1, aluminum nitride powder 2; the preparation method is to mix iron powder, kaolin, alum, and sodium tripolyphosphate, grind it into 200-300 mesh powder, and then add aluminate coupling agent DL-411 to mix Uniform, pressed into a blank at 10-15Mpa, then sent to 920-950°C for calcination for 3-4 hours, after cooling, crushed...