A kind of injection molding alloy powder and its application in automobile gearbox sliding sleeve

An automotive gearbox and injection molding technology, which is applied to belts/chains/gears, mechanical equipment, transmission parts, etc., can solve the problem of limited accuracy of temperature and atmosphere control, sliding sleeves that cannot be used in technical processes, and unstable strengthening phase content, etc. problems, to achieve the effect of optimizing the sintering process, expanding the temperature of the sintering interval, and improving the stability of tempering

Active Publication Date: 2016-04-20
湖南英捷高科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although there are some experimental reports on the preparation of 4140 medium carbon alloy steel by MIM, the technical process cannot be used to prepare sliding sleeves.
Because the use of sliding sleeves requires high density and strength, and the existing technology cannot meet such high requirements
The current MIM4140 alloy steel composition design is not reasonable, it can only be sintered at low temperature, and the sintering time is short (generally 2-4 hours), resulting in low sample density; simply improve its technology, such as using increased temperature sintering The method is easy to cause overburning, and the angle of the right angle between the horizontal part and the convex part of the part will be easily deformed after the sintering temperature is high (the verticality is difficult to guarantee), resulting in the scrapping of the product
In addition, due to the reported MIM4140 technology, in operation, due to the control of equipment and processes, it is inevitable that the temperature and atmosphere control accuracy is limited, which easily leads to fluctuations in carbon content, which makes the content of strengthening phase unstable, resulting in hardness and strength. decline
These factors lead to the sintering strength obtained by the existing MIM4140 technology is lower than 700MPa
In addition, the fluctuation of carbon content also affects the sintering densification, resulting in a narrow sintering "window", and the suitable temperature range for sintering is only 15°C, which makes sintering difficult

Method used

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  • A kind of injection molding alloy powder and its application in automobile gearbox sliding sleeve
  • A kind of injection molding alloy powder and its application in automobile gearbox sliding sleeve
  • A kind of injection molding alloy powder and its application in automobile gearbox sliding sleeve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation of the automobile gearbox sliding sleeve by injection molding alloy powder comprises the following steps:

[0048] Step 1: Preparation of feed

[0049] The selected alloy powder components are: C0.40, Si0.35, Mo0.7, Cr1.8, Mn0.6, B1.5, the balance is Fe, and the gas-atomized alloy powder with an alloy powder particle size of 8-10 μm, Mix in a mixer according to the mass ratio of alloy powder and binder 85:15, and mix for 30 minutes at 120-125°C to obtain the feed; the speed of the mixer is 60 rpm, and the mixing time is 2 hours;

[0050] Step Two: Injection Molding

[0051] The feed obtained in the first step is injected into the mold of the automobile gearbox sliding sleeve through the injection molding machine, and the mold is released to obtain the blank of the automobile gearbox sliding sleeve; the injection molding process parameters are: injection temperature 145°C, injection pressure 85MPa, mold The temperature is 50°C; the powder loading is 56%...

Embodiment 2

[0058] The preparation of the automobile gearbox sliding sleeve by injection molding alloy powder comprises the following steps:

[0059] Step 1: Preparation of feed

[0060] The selected alloy powder components are: C0.42, Si0.29, Mo0.76, Cr1.67, Mn0.67, B1.0, the balance is Fe, and the particle size of the alloy powder is 10-15μm. According to the mass ratio of alloy powder and binder 88:12, mix in a mixer, and mix for 50 minutes at 130-140°C to obtain the feed; the speed of the mixer is 150 rpm, and the mixing time is 1.5h ;

[0061] Step Two: Injection Molding

[0062] The feed obtained in the first step is injected into the mold of the automobile gearbox sliding sleeve through the injection molding machine, and the mold is released to obtain the blank of the automobile gearbox sliding sleeve; the injection molding process parameters are: injection temperature 155 ° C, injection pressure 100 MPa, mold The temperature is 55°C; the size of the powder loading is 60%;

[0...

Embodiment 3

[0069] The preparation of the automobile gearbox sliding sleeve by injection molding alloy powder comprises the following steps:

[0070] Step 1: Preparation of feed

[0071] The selected alloy powder components are: C0.45, Si0.25, Mo0.8, Cr1.6, Mn0.8, B0.8, the balance is Fe, and the gas-atomized alloy powder with an alloy powder particle size of 15-20 μm, According to the mass ratio of alloy powder and binder 90:10, mix in a kneader, knead for 45 minutes at 140-150°C to get the feed; the speed of the kneader is 200 rpm, and the kneading time is 0.8h ;

[0072] Step Two: Injection Molding

[0073] The feed material obtained in the first step is injected into the mold of the automobile gearbox sliding sleeve through the injection molding machine, and the mold is released to obtain the blank of the automobile gearbox sliding sleeve; the injection molding process parameters are: injection temperature 170°C, injection pressure 120MPa, mold The temperature is 60°C; the powder l...

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Abstract

The invention discloses injection molding alloyed powder and application of the injection molding alloyed powder in an automobile transmission sliding sleeve. The alloyed powder is gas atomization alloyed powder composed of C, Si, Mo, Cr, Mn, B and the balance Fe. According to the application, the alloyed powder and binding agents are mixed, and feed is obtained; the feed is injected in an automobile transmission sliding sleeve mould to be formed; then, the feed is presintered in a vacuum degreasing furnace under the protective atmosphere in a three-stage mode, and a presintered billet is obtained; finally, under the protective atmosphere, high-temperature sintering is carried out, and the automobile transmission sliding sleeve is obtained. On the basis of the injection molding process for adjusting components of the alloyed powder, the sintering process is easy to control, a sintering window is wide, the density of a sintered product is large, the mechanical property is excellent, the deformation of the sintering process is small, the size precision of a manufactured product is high, and the density of the sintered product exceeds 97 percent; the strength exceeds 900 MPa, compared with an original product of the same kind, the strength of the sintered product is improved by 30 percent, and the product reaches the international advanced level; the industrial scale production can be achieved, and the injection molding alloyed powder is particularly suitable for manufacturing the automobile transmission sliding sleeve.

Description

technical field [0001] The invention discloses an injection molding alloy powder and its application in a sliding sleeve of an automobile gearbox. The invention belongs to the technical field of powder metallurgy material preparation and metal injection molding. Background technique [0002] The sliding sleeve is one of the important parts in the automobile gearbox. Its material is 4140 medium carbon alloy steel (domestic brand 42CrMo). The preparation methods mainly include casting and forging. The process of casting 4140 alloy steel is simple, but the forming precision is not high, and the phenomenon of uneven composition and structure is prone to occur. Forged 4140 alloy steel has superior performance, but its cost is high. Metal injection molding (Metal Injection Molding, referred to as MIM) can produce high-performance special-shaped metal parts with complex shapes at a lower cost. Therefore, some studies have used MIM technology to manufacture 4140 alloy steel mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/18C22C38/02C22C38/04C22C38/32B22F1/00B22F3/22F16H57/00
Inventor 何浩李益民邓忠勇
Owner 湖南英捷高科技有限责任公司
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