Selective laser melting forming method for small-gap closed aluminum alloy impeller

A technology of laser selective melting and aluminum alloy impeller, which is applied in the directions of additive manufacturing, process efficiency improvement, additive processing, etc. problems, to achieve the effect of ensuring the consistency of the surface quality of the flow channel, improving the dimensional accuracy and shape accuracy, and improving the mechanical properties and reliability

Active Publication Date: 2019-08-23
XIAN SPACE ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In various types of conventional transport engines, the number of aluminum alloy impeller blades is large and the shape is complex, and the outlet gap is narrow (minimum 1.6mm), which cannot be formed by precision casting
At present, the aluminum alloy is used to process the front cover plate and impeller separately, and then brazed into the impeller assembly. The processing process is complex and the cycle is long. Low opening strength and other problems, there are certain quality hidden dangers
The existence of the above problems seriously restricts the short-cycle, high-reliability rapid development and production of conventional transport engines

Method used

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  • Selective laser melting forming method for small-gap closed aluminum alloy impeller
  • Selective laser melting forming method for small-gap closed aluminum alloy impeller
  • Selective laser melting forming method for small-gap closed aluminum alloy impeller

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Experimental program
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Embodiment

[0068] Such as Figure 5 As shown, a small-gap closed-type aluminum alloy impeller laser selective melting forming method, the steps include:

[0069] (1) The established three-dimensional model of the aluminum alloy impeller, such as figure 1 As shown, the diameter is 70mm, the height is 46mm, and the outlet size is 1.6mm;

[0070] (2) The selected impeller forming direction, such as figure 2 shown.

[0071] (3) Add process pre-compensation, the schematic diagram of process pre-compensation is as follows image 3 shown.

[0072] (4) The added support of the final model, including the hollow columnar support inside the impeller and the solid support at the lower part of the cover plate, the hollow columnar support is as follows Figure 4 shown.

[0073] (5) Adjust the position of the model with added support on the forming substrate platform, and then select the parameter package of AlSi10Mg aluminum alloy for subdivision processing. The process parameters of the impell...

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Abstract

The invention relates to a selective laser melting forming method for a small-gap closed aluminum alloy impeller, and belongs to the technical field of metal additive manufacturing. The small gap refers to that an outlet gap between a front cover plate and a rear cover plate in the impeller is not more than 3 mm. Process pre-compensation is adopted, and a columnar support convenient to remove is additionally arranged, so that the size precision, the shape precision and the surface roughness of an inner runner are ensured, wherein the precision can reach + / -0.1 mm, the surface roughness of theinner runner subjected to surface finishing can reach Ra of 1.6 microns, so that overall additive manufacturing of the small-gap closed aluminum alloy impeller becomes possible.

Description

technical field [0001] The invention relates to a small-gap closed-type aluminum alloy impeller laser selective melting forming method, which belongs to the technical field of metal additive manufacturing. The small gap means that the outlet gap between the front cover plate and the rear cover plate in the impeller is not greater than 3mm. Background technique [0002] The turbo pump impeller is an important part of the pumped liquid rocket engine, which ensures the efficient, reliable and continuous supply of fuel and oxidizer during the working process of the engine. Most of the impellers are closed structures, with different numbers of built-in blades with complex surface structures, which cannot be directly formed by mechanical processing methods. At present, split processing + brazing or precision casting are mainly used for processing and forming. In various types of conventional transport engines, the number of aluminum alloy impeller blades is large and the shape is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/24C22C21/02B33Y10/00B33Y80/00
CPCB22F3/24C22C21/02B33Y10/00B33Y80/00B22F2003/248B22F2003/247B22F10/00B22F10/68B22F10/66B22F10/28B22F10/34B22F10/36B22F10/366B22F10/47Y02P10/25
Inventor 李护林杨欢庆王云王琳雷钥
Owner XIAN SPACE ENGINE CO LTD
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