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A Design Method for Asymmetric Riser

A design method and asymmetric technology, applied in the field of titanium alloy casting, can solve problems such as low yield rate, and achieve the effect of improving yield rate, obvious effect and reducing waste.

Active Publication Date: 2020-06-16
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a design method for an asymmetric riser. Aiming at the problems that the conventional riser cannot effectively lead to shrinkage defects and low material yield in the existing titanium alloy casting process, an asymmetric riser is designed to replace the conventional riser. Defects that cannot be extracted from the mouth can be extracted from the casting, thereby improving the internal quality of the casting, reducing subsequent repair welding and repairing, and improving product quality; at the same time, increasing the material yield and reducing raw material costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Example 1: Leading out gap defect aspects

[0030] A tail ring casting customized by a company has an outline size of Ф220mm×160mm and a wall thickness of 22mm. Because the wall thickness of this product is relatively thick and the wall thickness distribution is uneven, the shrinkage cavity cannot be drawn out of the casting when a general riser is used. Demonstration according to the design steps of the present invention is as follows:

[0031] 1. Import the designed casting system into the Huazhu simulation software to simulate casting, and obtain the distribution of shrinkage cavities in the casting as well as the size and quantity of shrinkage cavities;

[0032] 2. Add a symmetrical riser to the casting system and carry out simulated casting. It is found that the symmetrical riser can only lead to part of the shrinkage cavity, and the shrinkage cavity cannot be completely induced by increasing the size of the riser;

[0033] 3. Add an asymmetric riser to the casti...

example 2

[0034] Example 2: Improve material yield

[0035] A company customized a titanium alloy fan impeller casting, with an outline size of Ф810mm×290mm and a wall thickness of 57mm in the thick zone. Because the wall thickness of this product is relatively thick, and the wall thickness distribution is uneven, the material yield is low when using a general riser.

[0036]1. Import the designed casting system into the Huazhu simulation software to simulate casting, and obtain the distribution of shrinkage cavities in the casting as well as the size and quantity of shrinkage cavities;

[0037] 2. Add a symmetrical riser to the casting system and simulate casting. It is found that the symmetrical riser can lead to all shrinkage cavities, but it is a waste of material. The weight of the casting: 540Kg, the riser: 192Kg, and the material yield: 73.7%;

[0038] 3. Add an asymmetric riser to the casting system and perform simulated casting. After analysis, all the shrinkage cavities insid...

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PUM

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Abstract

A design method for an asymmetric riser, importing the designed casting system into the casting simulation software, performing casting simulation, analyzing the situation of the riser in the casting, and designing a symmetrical riser based on this, and then simulating again, when the symmetrical riser When the shrinkage cavity cannot be drawn out after adjustment, add an asymmetric riser to the casting system, and perform multiple simulated castings through the offset of the asymmetric weight in one direction, and then determine the position of the asymmetric riser. The size of the asymmetrical riser is then proportionally fine-tuned to obtain the smallest size asymmetrical riser. The method of the invention eliminates the shrinkage cavity inside the titanium alloy casting and achieves the purpose that the conventional riser cannot effectively lead out defects, and on the other hand solves the problem of low material yield of the conventional riser.

Description

technical field [0001] The invention belongs to the field of titanium alloy casting, and specifically relates to a design method of an asymmetric riser, on the one hand, eliminating the shrinkage cavity inside the titanium alloy casting, achieving the purpose that the conventional riser cannot effectively lead out defects, and on the other hand, solving the conventional The problem of low yield rate of riser. Background technique [0002] Shrinkage cavity defects in the casting process of titanium alloy seriously affect the quality of castings, especially for thick and large castings, feeding is difficult, and the internal shrinkage cavity formed is relatively large (generally ≥ 10mm). On the one hand, this defect becomes the weak zone of the casting, which affects the mechanical properties of the casting. On the other hand, it makes the surface of the casting form a huge static pressure pit after hot isostatic pressing (HIP), causing the casting to deform. In view of the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
Inventor 乔海滨孙宏喆麻毅刘义辉袁兵兵刘茵琪
Owner LUOYANG SUNRUI TI PRECISION CASTING