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Casting process of turbine of turbocharger for gasoline engine

A turbocharger and gasoline engine technology, which is applied in the field of metallurgical technology, can solve problems such as structural design and process route defects, and achieve the effects of high internal quality, high dimensional accuracy and high surface finish

Active Publication Date: 2015-03-11
METALINK SPECIAL ALLOYS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many factors that cannot meet the above requirements, the most important of which is the internal quality of the turbine inlet side, and the structural design and process route defects in the casting process of traditional turbocharger castings

Method used

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  • Casting process of turbine of turbocharger for gasoline engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A non-reserve investment casting process for a turbocharger for a gasoline engine, comprising the following steps:

[0025] 1) Design and manufacture of wax molds; place the mold on the working table of the wax press machine, adjust the height of the nozzle and the wax injection port to be consistent; open the mold, and spray a thin layer of atomized silicone oil after checking that it is correct, and then close it mold, align with the wax nozzle;

[0026] 2) Compression and inspection of turbocharger wax molds: press the work button with both hands to press the wax molds; among them, the wax used for the wax molds in the wax mold pressing is filled with wax AB2066, and its shrinkage rate is controlled between 0.4% and 0.65%. Between, the ash content should be small. Pressing parameters are as follows: barrel area temperature 65°C; wax injection temperature 62°C; nozzle temperature 62°C; upper and lower template temperature 30°C; mold clamping pressure 30bar; injection...

Embodiment 2

[0041] Basically the same as Example 1, the difference is: the pressing of the turbocharger wax mold: the temperature of the barrel area is 63°C; the temperature of wax injection is 62°C; the temperature of the nozzle is 60°C; the temperature of the upper and lower templates is 27°C; Pressure 40bar; injection pressure 8bar; injection time 40S; holding time 40S; parting agent: atomized silicone oil.

[0042] The master alloy is selected from the chemical composition shown in Table 2, and the balance is impurities.

[0043] Table 2 Unit: Mass %

[0044] Ni Cr Si P Fe mn Cu Sb Pb Bi 73.64 12.63 0.017 0.006 0.0270 0.0003 0.0026 <0.0001

[0045] The pouring of turbochargers for gasoline engines takes place on a three-chamber vacuum induction furnace. Vacuum induction furnace: the final baking temperature of the formwork is 1000°C, and the heat preservation is 3h; the superheating temperature of the alloy liquid is 1580°C; the pouring temperatur...

Embodiment 3

[0047] Basically the same as Example 1, the difference is: the pressing of the turbocharger wax mold: the temperature of the barrel area is 68°C; the temperature of wax injection is 65°C; the temperature of the nozzle is 65°C; the temperature of the upper and lower templates is 32°C; Pressure 45bar; injection pressure 5bar; injection time 80S; holding time 90S; parting agent: atomized silicone oil.

[0048] The master alloy is selected from the chemical composition shown in Table 3, and the balance is impurities.

[0049] Table 3 Unit: Mass %

[0050] Ni Cr Si P Fe mn Cu Sb Pb Bi 73.65 12.67 0.041 0.006 0.0310 0.0020 0.0025 <0.0001

[0051] The pouring of turbochargers for gasoline engines is carried out on a three-chamber vacuum induction furnace or a rapid melting furnace. Vacuum induction furnace: the final baking temperature of the formwork is 1050°C, and the heat preservation is 3h; the superheating temperature of the alloy liquid is ...

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Abstract

The invention discloses a gasoline engine turbocharger marginless investment precision casting process, wherein the process comprises the following steps: 1) mold design and manufacturing of a wax mold; 2) pressing and inspection of the turbocharger wax mold; 3) combination and oil removal of a turbocharger wax mold set; 4) shell preparation of the turbocharger wax mold set; 5) vacuum smelting of a mother alloy for pouring; 6) vacuum melting and pouring of a turbocharger casting piece; 7) cleaning, cutting and sand blasting of a turbocharger mold shell, and polishing of a casting head; and 8) nondestructive testing of the turbocharger casting piece, and inspection of the surface and dimension of the casting piece. The marginless precision casting process path method easily satisfies the mass production, can meet the use requirements, solves a passenger car gasoline engine turbocharger charging turbine, achieves the nationalization problem of the component, and can be stable in batch production.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and specifically uses a vacuum induction furnace smelting equipment or a rapid melting furnace to melt and cast a no-surplus precision casting mold shell of a turbocharger turbocharger for a passenger car gasoline engine with a certain size requirement to obtain dimensional accuracy. Turbochargers with high quality, high internal quality and high surface finish are also suitable for vacuum smelting induction casting of high-precision, high internal quality turbo castings. Background technique [0002] The turbocharger designed and manufactured according to the traditional casting process operates at 950°C and 190,000r·min -1 Under the premise, it can only withstand the temperature for 100-200 hours, which cannot meet the design requirement of 300 hours. There are many factors that cannot meet the above requirements, the most important of which are the internal quality of the turbine inlet sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04C22C33/06
CPCB22C9/04C22C19/051C22C19/056
Inventor 马步洋王浩冰邓军刘海艳王加强贾明
Owner METALINK SPECIAL ALLOYS CORP
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