Method for designing riser during sand casting process of thin wall casting of solid of revolution based on shrinkage defect prediction

A technology of thin-walled castings and sand casting, which is applied in the direction of casting molding equipment, casting molds, and casting mold components. degree of effect

Inactive Publication Date: 2016-05-25
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problem that the existing method cannot accurately design the size of the riser, thereby providing a design method for the riser in the sand casting process of the thin-walled casting of a rotary body based on the prediction of shrinkage porosity

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  • Method for designing riser during sand casting process of thin wall casting of solid of revolution based on shrinkage defect prediction
  • Method for designing riser during sand casting process of thin wall casting of solid of revolution based on shrinkage defect prediction
  • Method for designing riser during sand casting process of thin wall casting of solid of revolution based on shrinkage defect prediction

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specific Embodiment approach 1

[0042] Specific Embodiment 1: The riser design method in the process of sand casting of thin-walled castings based on shrinkage porosity prediction described in this embodiment is carried out according to the following steps:

[0043] Step 1. Design a physical simulation experiment to obtain the heating curve of different points in the sand mold:

[0044] Carry out numerical simulation of the temperature field, and directly determine the interface heat transfer coefficient of the alloy / sand mold (between the alloy and the sand mold) by using the heat flux density versus time curve provided by the experiment;

[0045] Step 1 (1), the shape and size characteristics of the casting in the physical simulation experiment: the casting is a rectangular plate, and the length of the rectangular plate is represented by L plane Indicates that the plate thickness δ plane Minimum wall thickness δmin of thin-walled castings with rotary bodies casting and the maximum wall thickness δmax ca...

specific Embodiment approach 2

[0058] Specific embodiment two: in the step one (1) described in this embodiment, the length L of the rectangular plate plane It is 254mm. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0059] Specific implementation mode three: In this implementation mode, in step one,

[0060] The thin-walled casting of the rotary body is selected from the cylinder blade casting. The cylinder blade casting is made of duplex stainless steel. The materials of the duplex stainless steel are: C: 0.02wt%, Si: 0.58wt%, Mn: 0.88wt%, S: 0.04wt%, P: 0.04wt%, Ni: 5.00wt%, Mo: 3.00wt%, Cu: 0.60wt%, N: 0.25wt%, Cr: 22.00wt%, the balance is Fe. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for designing a riser during a sand casting process of a thin wall casting of a solid of revolution based on shrinkage defect prediction, relating to the technology of sand casting of a thin wall casting of a solid of revolution and aiming at solving the technical problem that the size of a riser cannot be accurately designed according to an existing method. According to the invention, an alloy / sand mold interface heat exchange coefficient is determined by a physical experiment method, and the practicability of the interface heat exchange coefficient is subjected to experimental verification by an experimental means of casting a circular casting by a sand mold, and thus the riser can be designed based on accurate shrinkage defect prediction. The precise selection and experimental verification of the alloy / sand mold interface heat exchange coefficient lay solid foundation for the accurate prediction on shrinkage defects and the reasonable design on riser size, the problem of huge trials but lack of necessary experimental verification during an existing defect prediction and riser designing process is solved, the accuracy of riser design is improved, the casing process optimization is accelerated, the production development period is shortened, and the quality of a casting product is improved by 20%-40%.

Description

technical field [0001] The invention relates to a design method for a riser in the sand casting process of a thin-walled casting of a rotary body, and relates to the sand casting technology of a thin-walled casting of a rotary body. Background technique [0002] Thin-walled castings of the rotary body (for example, the engine hood of the car is a thin-walled casting of the cylinder body, and the generator wheel is a thin-walled piece of the cylinder blade). 50mm), the tendency of the paste to solidify at the same time is large, and the feeding channel of the open riser on the top of the casting is easily blocked by the dendrite skeleton, which cannot effectively feed the lower part of the casting. Shrinkage defects occur. Shrinkage porosity is an important casting defect. Due to the reduction of the area of ​​the load-bearing surface, its presence will seriously weaken the strength and hardness of the casting. Compared with thick-walled castings, due to the small thicknes...

Claims

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Application Information

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IPC IPC(8): B22C9/08
CPCB22C9/088
Inventor 刘东戎杨智鹏杨洋郭二军
Owner HARBIN UNIV OF SCI & TECH
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