阅读说明：本技术 一种粉末冶金齿轮的制造方法 (Manufacturing method of powder metallurgy gear ) 是由 王挺浩 王永国 于 2019-12-09 设计创作，主要内容包括：本发明公开了一种粉末冶金齿轮的制造方法,该粉末冶金齿轮的制造方法包括如下步骤：P1、混料；P2、成型；P3、预热；P4、复压；P5、烧结；P6、调质；P7、渗碳；P8、精修；P9、后处理：对精修齿轮进行清洗,涂抹防锈油,包装入库,即可得到所述齿轮,本发明提供的一种粉末冶金齿轮的制造方法通过在混料成型后,再次进行预热和复压,能够有效提高粉末结合的紧密型,保证齿轮结构强度,同时在烧结时精确控制各阶段温度,并且调质和渗碳处理,保证齿轮表面强度,避免开裂,同时在存放时进行防锈包裹,精确防护处理,有效提高齿轮制造和存放的稳定性,利于生产使用和推广。(The invention discloses a manufacturing method of a powder metallurgy gear, which comprises the following steps: p1, mixing; p2, molding; p3, preheating; p4, repressing; p5, sintering; p6, tempering; p7, carburizing; p8, fine modification; p9, post-treatment: the manufacturing method of the powder metallurgy gear provided by the invention has the advantages that the fine-finished gear is cleaned, the antirust oil is coated, and the gear can be obtained after packaging and warehousing.)

1. A manufacturing method of a powder metallurgy gear is characterized in that: the manufacturing method of the powder metallurgy gear comprises the following steps:

p1, mixing: selecting raw materials of each component according to the mass percentage, and uniformly mixing to obtain a mixed raw material;

p2, forming: mounting the designed forming die on a powder metallurgy forming press, and adding the mixed raw materials into the forming die for pressing to obtain a pressed blank;

p3, preheating: preheating the pressed blank by an induction heating machine to 400-500 ℃ to obtain a preheated blank;

p4, repression: placing the preheated blank into a forming die, and carrying out re-pressing under the pressure of 150MPa to 160MPa to obtain a re-pressed blank;

p5, sintering: putting the re-pressed blank into a vacuum sintering furnace, and sintering for 80 to 100 minutes at 1000 to 1200 ℃ to obtain a sintered blank;

p6, tempering: quenching the sintered blank at 800-850 ℃, and then tempering at 550-590 ℃ to obtain a quenched and tempered blank;

p7, carburization: placing the quenched and tempered blank into a carburizing furnace for surface carburizing to obtain a carburized blank;

p8, fine modification: carrying out oil immersion treatment on the carburized blank, and then taking out the carburized blank for fine modification to obtain a fine modified gear;

p9, post-treatment: and cleaning the fine-finished gear, coating antirust oil, packaging and warehousing to obtain the gear.

2. A method of manufacturing a powder metallurgy gear according to claim 1, wherein: the raw materials of the P1 step comprise 96-98% of iron, 0.1-0.2% of silicon, 0.1-0.2% of manganese, 0.2-0.5% of nickel, 0.1-0.2% of chromium, 0.4-0.6% of carbon and the balance of impurities.

3. A method of manufacturing a powder metallurgy gear according to claim 1, wherein: the recompression density of step P4 is in the range of 7.6 grams per cubic centimeter to 7.8 grams per cubic centimeter.

4. A method of manufacturing a powder metallurgy gear according to claim 1, wherein: and the sintering in the step P5 is divided into that the low-temperature sintering temperature is 1000-1050 ℃ and lasts for 40-50 minutes, and the high-temperature sintering temperature is 1150-1200 ℃ and lasts for 30-50 minutes.

5. A method of manufacturing a powder metallurgy gear according to claim 1, wherein: the carburizing temperature of the P7 step is 800-850 ℃, lasts for 1-1.5 hours, and the carburizing depth is 0.5-0.8 mm.

6. A method of manufacturing a powder metallurgy gear according to claim 1, wherein: the P8 step finishing includes grinding the tooth tips and tooth flanks.

7. A method of manufacturing a powder metallurgy gear according to claim 1, wherein: the antirust oil in the step P9 is one of tung oil and hard film oil.

Technical Field

The invention relates to the technical field of gear manufacturing, in particular to a manufacturing method of a powder metallurgy gear.

Background

In the current industrial production, gears are widely used to transmit power by meshing with each other, and the machining and manufacturing of gears are also carried out in various ways, among which powder metallurgy is one of them.

However, the existing powder metallurgy gear manufacturing method can not ensure the compactness of powder pressing when the powder is pressed into a form, further influences the strength of the gear after direct sintering, has poor product quality, has poor subsequent treatment degree, influences the surface quality of the gear, is not beneficial to stable meshing, reduces the use stability, and is not beneficial to production and use.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a manufacturing method of a powder metallurgy gear.

In order to achieve the purpose, the invention adopts the following technical scheme:

a manufacturing method of a powder metallurgy gear comprises the following steps:

p1, mixing: selecting raw materials of each component according to the mass percentage, and uniformly mixing to obtain a mixed raw material;

p2, forming: mounting the designed forming die on a powder metallurgy forming press, and adding the mixed raw materials into the forming die for pressing to obtain a pressed blank;

p3, preheating: preheating the pressed blank by an induction heating machine to 400-500 ℃ to obtain a preheated blank;

p4, repression: placing the preheated blank into a forming die, and carrying out re-pressing under the pressure of 150MPa to 160MPa to obtain a re-pressed blank;

p5, sintering: putting the re-pressed blank into a vacuum sintering furnace, and sintering for 80 to 100 minutes at 1000 to 1200 ℃ to obtain a sintered blank;

p6, tempering: quenching the sintered blank at 800-850 ℃, and then tempering at 550-590 ℃ to obtain a quenched and tempered blank;

p7, carburization: placing the quenched and tempered blank into a carburizing furnace for surface carburizing to obtain a carburized blank;

p8, fine modification: carrying out oil immersion treatment on the carburized blank, and then taking out the carburized blank for fine modification to obtain a fine modified gear;

p9, post-treatment: and cleaning the fine-finished gear, coating antirust oil, packaging and warehousing to obtain the gear.

Preferably, the raw materials of the components in the step P1 comprise 96-98% of iron, 0.1-0.2% of silicon, 0.1-0.2% of manganese, 0.2-0.5% of nickel, 0.1-0.2% of chromium, 0.4-0.6% of carbon and the balance of impurities.

Preferably, the recompression density of the P4 step is in the range of 7.6 grams per cubic centimeter to 7.8 grams per cubic centimeter.

Preferably, the sintering in the step P5 is divided into a low-temperature sintering temperature of 1000 to 1050 ℃ for 40 to 50 minutes, and a high-temperature sintering temperature of 1150 to 1200 ℃ for 30 to 50 minutes.

Preferably, the carburizing temperature of the P7 step is 800 set to 850 degrees celsius for 1 to 1.5 hours, and the carburizing depth is 0.5 to 0.8 mm.

Preferably, the P8 step finishing includes a tooth tip and tooth surface grinding process.

Preferably, the rust preventive oil in the step P9 is one of tung oil and hard film oil.

According to the manufacturing method of the powder metallurgy gear, provided by the invention, preheating and re-pressing are carried out again after material mixing and forming, so that the compactness of powder combination can be effectively improved, the structural strength of the gear is ensured, meanwhile, the temperature of each stage is accurately controlled during sintering, and the surface strength of the gear is ensured by quenching and tempering and carburizing treatment, cracking is avoided, meanwhile, rust-proof wrapping and accurate protection treatment are carried out during storage, the manufacturing and storage stability of the gear is effectively improved, and the manufacturing method is beneficial to production, use and popularization.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A manufacturing method of a powder metallurgy gear comprises the following steps:

p1, mixing: selecting raw materials of each component according to the mass percentage, and uniformly mixing to obtain a mixed raw material;

p2, forming: mounting the designed forming die on a powder metallurgy forming press, and adding the mixed raw materials into the forming die for pressing to obtain a pressed blank;

p3, preheating: preheating the pressed blank by an induction heating machine to 400-500 ℃ to obtain a preheated blank;

p4, repression: placing the preheated blank into a forming die, and carrying out re-pressing under the pressure of 150MPa to 160MPa to obtain a re-pressed blank;

p5, sintering: putting the re-pressed blank into a vacuum sintering furnace, and sintering for 80 to 100 minutes at 1000 to 1200 ℃ to obtain a sintered blank;

p6, tempering: quenching the sintered blank at 800-850 ℃, and then tempering at 550-590 ℃ to obtain a quenched and tempered blank;

p7, carburization: placing the quenched and tempered blank into a carburizing furnace for surface carburizing to obtain a carburized blank;

p8, fine modification: carrying out oil immersion treatment on the carburized blank, and then taking out the carburized blank for fine modification to obtain a fine modified gear;

p9, post-treatment: and cleaning the fine-finished gear, coating antirust oil, packaging and warehousing to obtain the gear.

Preferably, the raw materials of the components in the step P1 comprise 96-98% of iron, 0.1-0.2% of silicon, 0.1-0.2% of manganese, 0.2-0.5% of nickel, 0.1-0.2% of chromium, 0.4-0.6% of carbon and the balance of impurities.

Preferably, the recompression density of the P4 step is in the range of 7.6 grams per cubic centimeter to 7.8 grams per cubic centimeter.

Preferably, the sintering in the step P5 is divided into a low temperature sintering temperature of 1000 to 1050 ℃ for 40 to 50 minutes, and a high temperature sintering temperature of 1150 to 1200 ℃ for 30 to 50 minutes.

Preferably, the carburizing temperature of the P7 step is 800 set to 850 degrees celsius for 1 to 1.5 hours, and the carburizing depth is 0.5 to 0.8 mm.

Preferably, the P8 step finishing includes a tooth tip and tooth surface grinding process.

Preferably, the rust preventive oil in the step P9 is one of tung oil and hard film oil.

According to the manufacturing method of the powder metallurgy gear, provided by the invention, preheating and re-pressing are carried out again after material mixing and forming, so that the compactness of powder combination can be effectively improved, the structural strength of the gear is ensured, meanwhile, the temperature of each stage is accurately controlled during sintering, and the surface strength of the gear is ensured by quenching and tempering and carburizing treatment, cracking is avoided, meanwhile, rust-proof wrapping and accurate protection treatment are carried out during storage, the manufacturing and storage stability of the gear is effectively improved, and the manufacturing method is beneficial to production, use and popularization.