Combined wax pattern-based method of achieving precision investment casting for heat-resistant cast steel thin-wall turbine shell

A technology of heat-resistant cast steel and turbine shell, which is applied in the direction of casting mold, casting mold composition, casting molding equipment, etc. rate, ensure casting accuracy, and improve the effect of filling capacity

Active Publication Date: 2015-04-01
北京领动国创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to factors such as the poor fluidity of austenitic heat-resistant cast steel, high pouring temperature, easy gas absorption, oxidation and sand sticking, and the special and complex structure of the turbine shell, the application of austenitic heat-resistant cast steel in the turbine shell is relatively large. The difficulty of the process, the applicability of special casting methods such...

Method used

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  • Combined wax pattern-based method of achieving precision investment casting for heat-resistant cast steel thin-wall turbine shell
  • Combined wax pattern-based method of achieving precision investment casting for heat-resistant cast steel thin-wall turbine shell
  • Combined wax pattern-based method of achieving precision investment casting for heat-resistant cast steel thin-wall turbine shell

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Embodiment 1

[0035] The overall investment casting structure for the heat-resistant cast steel thin-walled turbine shell described in the present invention is as follows: figure 2 As shown, its process method combines figure 1 , including the following steps:

[0036] a. Select low-temperature wax CP200 as the investment material of the turbine shell, let it stand for dewatering treatment, and use 3D printing technology to form the overall turbine shell wax mold 1.

[0037] b. Using A62 medium-temperature mold material with a softening point of 76°C, an ash content of ≤0.03% by mass, and a melting point of 85°C, put it aside for dehydration treatment, and melt-extrude to form a casting riser wax mold 2.

[0038] c. Combined wax model: use bonding wax to bond and combine the integral turbine shell wax model 1 in step a and the casting riser wax model 2 in step b at the bonding surface 3, and the bonding wax temperature is controlled at 160 ± within 10°C.

[0039] d. Shell made of silica...

Embodiment 2

[0045] The shape of the turbine casing for casting according to the present invention is as follows image 3 As shown, its heat-resistant cast steel thin-walled investment casting process method includes the following steps:

[0046] a. Select low-temperature wax CP200 as the investment material of the turbine shell, let it stand for dewatering treatment, and use 3D printing technology to form the 4 wax molds of the upper half shell of the turbine shell.

[0047] b. Using A62 medium-temperature mold material with a softening point of 76°C, an ash content of ≤0.03% by mass, and a melting point of 85°C, put it aside for dehydration treatment, and melt-extrude to form a casting riser wax mold 2.

[0048] c. Use bonding wax to bond and combine the wax mold of the turbine casing upper half shell 4 in step a and the casting riser wax mold in step b, and control the temperature of the bonding wax within the range of 160±10°C.

[0049] d. Select low-temperature wax CP200 as the inves...

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Abstract

The invention discloses a combined wax pattern-based method of achieving precision investment casting for a heat-resistant cast steel thin-wall turbine shell, and belongs to the technical field of casting. In the method, the turbine shell is made of a heat-resistant cast steel material, a wax pattern of the turbine shell is three-dimensionally printed by adopting low-temperature wax, a riser wax pattern is poured by adopting medium-temperature wax through melt extrusion moulding, the combined wax pattern is formed by reliably bonding the wax pattern of the turbine shell with the riser wax pattern by bonding wax; an investment casting technical process based on the combined wax pattern comprises the following steps: preparing wax patterns, combining the wax patterns, producing a shell, carrying out investment wax removal, roasting a pattern shell, melting an alloy, pouring, compacting the shell, blasting shots, cleaning the shell, and the like. The method disclosed by the invention can be used for effectively increasing the wax pattern moulding efficiency of the turbine shell, reducing the cost, ensuring the casting accuracy of a runner of the turbine shell, improving the mould-filling capacity of heat-resistant cast steel, and achieving the thin-wall casting of the turbine shell; the wall thickness can be reduced to 3mm, and thus a light-weight purpose is achieved and the needs of an aircraft engine supercharger are met.

Description

technical field [0001] The invention relates to the technical field of turbocharging of aviation piston engines, in particular to a heat-resistant cast steel thin-walled turbine casing investment casting process based on a combined wax pattern for turbochargers, which is also applicable to automotive turbochargers. Especially in the field of car turbocharger technology. Background technique [0002] The turbocharger is installed on the exhaust pipe of the engine, and the turbine casing is directly connected to the exhaust pipe. It is under high temperature and high pressure working conditions, especially in aviation piston engines and passenger car gasoline engines, where the exhaust temperature is as high as 950 °C ~1050°C, which is much higher than the maximum exhaust temperature of a diesel engine at 850°C. The commonly used silicon-molybdenum ductile iron turbine casing can no longer meet its performance requirements, while austenitic heat-resistant cast steel has good h...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/22
CPCB22C9/04B22C9/22
Inventor 杜发荣姬芬竹周煜李亚静
Owner 北京领动国创科技有限公司
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