Powder injection molding quality control method for automotive supercharged turbine
A technology of powder injection molding and quality control method, which is applied in the direction of turbines, mechanical equipment, etc., can solve the problems of reducing the degreasing speed of the green body, difficult to completely remove the binder, and prone to cracks, etc., to avoid process defects and service Reliability is not affected, the effect of guaranteed quality
Inactive Publication Date: 2016-04-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology
[0006] Generally, the thickness of the parts suitable for the powder injection molding process is generally controlled within 10 mm. For the turbocharger with an outer diameter of 50-70 mm, the thickness of the central solid part is still too large. Excessive thickness will seriously reduce the degreasing of the green body. The speed makes it difficult to completely remove the binder in the green body, and there are technical problems that the injection molding of complex parts is prone to cracks and uneven deformation
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[0017] The embodiments will be described in detail below in conjunction with the accompanying drawings.
[0018] 1) Turbine specifications and raw materials
[0019] Turbine specification: 52mm supercharged turbo
[0020] Powder alloy material: In713c nickel-based superalloy
[0021] Powder particle size range: ~30μm
[0022] Binder formula: polyoxymethylene (POM): high-density polyethylene (HDPE): ethylene-vinyl acetate copolymer (EVA) = 88: 10: 2
[0023] Feeding ratio: IN713c alloy powder: binder = 66:33 (volume ratio)
[0024] Feeding and mixing temperature: 150°C
[0025] 2) The hollow design of the turbine structure, such as figure 1 As shown, there is a Φ5×20 hollow inner hole 2 in the center of the turbine body 1 to reduce the wall thickness of the turbine;
[0026] 3) A hot runner is added to the turbo injection molding mold to improve the fluidity of the injection feeding material and the uniformity and stability of the filling, and to prevent the viscosity cha...
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Abstract
The invention belongs to the technical field of powder high-temperature alloy part shaping and automotive turbosuperchager critical component manufacturing, and particularly relates to a powder injection molding quality control method for an automotive supercharged turbine. The powder injection molding quality control method includes the steps that a hollow design for thinning the structure of a turbine body is adopted, so that the green body degreasing thickness is decreased; meanwhile, a polyformaldehyde group binder is adopted, a catalyzing degreasing process is used in a matched manner to achieve rapid and complete degreasing of a turbine green body, and turbine deformation and binder residues are reduced; and meanwhile, a hot runner technology is adopted in a turbine injection molding die, mold filling of injection molding is stable, the quality of the turbine green body is guaranteed, and various process defects are avoided. Powder injection molding turbine materials include iron-based, nickel-based and nickel-cobalt-based high temperature alloys. By means of the above main technological method and quality control method, injection molding turbine components which are qualified in appearance size and good in internal quality can be obtained.
Description
technical field [0001] The invention belongs to the technical field of forming powder superalloy parts and manufacturing key parts of a turbocharger for a vehicle, and in particular relates to a quality control method for powder injection molding of a turbocharger for a vehicle. Background technique [0002] Turbocharging is an important measure to improve the fuel efficiency of automobile engines and reduce the emission of harmful gases and particulate matter. Driven by the advancement of supercharging technology and the acceleration of the internationalization of environmental protection conventions, the models supporting turbocharging have gradually shifted from heavy-duty vehicles to light-duty vehicles. Cars, sedans and mini-cars transition, and gradually from the current diesel engine turbocharging basic full coverage to gasoline engine turbocharging popularization direction. With the continuous increase of my country's automobile production and ownership, the demand f...
Claims
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IPC IPC(8): B22F3/22B22F5/00
CPCB22F3/225B22F5/009
Inventor 杨福宝章林李大全朱强
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG