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Precise design method for casting shrinkage size based on local envelope density

A design method and casting shrinkage technology, applied in the direction of constraint-based CAD, design optimization/simulation, special data processing applications, etc., can solve the problems of large dimensional accuracy error of castings and insignificant accuracy effect, and achieve the solution of large precision error, The design method is reasonable and feasible, and the effect of expanding the scope of application

Active Publication Date: 2021-06-22
HARBIN INST OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the existing empirical scaling method has large casting dimensional accuracy errors, and the effect of the overall envelope density method on improving the casting dimensional accuracy is not obvious, and to provide a casting shrinkage size based on local envelope density. precise design method

Method used

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  • Precise design method for casting shrinkage size based on local envelope density
  • Precise design method for casting shrinkage size based on local envelope density
  • Precise design method for casting shrinkage size based on local envelope density

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specific Embodiment approach 1

[0020] Specific embodiment one: present embodiment a kind of accurate design method of casting shrinkage size based on local enveloping density, finish according to the following steps:

[0021] 1. Divide the test model into several local envelopes according to the contraction center ray division method, first calculate the local envelope density of any local envelope, and according to the quadratic relationship curve between the local envelope density and the shrinkage rate, get Calculate the shrinkage of the local envelope, and then use the same method to obtain the shrinkage of all the local envelopes of the test model;

[0022] 2. Convert the shrinkage rate of all local envelopes of the test model into the shrinkage rate of the same part on the casting. The conversion formula is as follows:

[0023] ε li = α 1 ·ε 1 +α 2 ·ε 2 +…+α n ·ε n +(1-α 1 -α 2 -...-α n )·ε 0

[0024] In the formula, ε n Represents the shrinkage rate of the nth local envelope of the test ...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the shrinkage center ray division method described in step one includes the following steps: first determine the shrinkage center of the test model and the envelope of the test model, and then start from the shrinkage Make several rays from the center to the envelope of the test model, and the closed space formed by two adjacent rays and the edge of the envelope is a local envelope.

[0029] Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the shrinkage center of the test model is the center of mass of the test model.

[0031] Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a casting shrinkage size accurate design method based on local envelope density, and relates to the technical field of casting size accuracy design. The method aims at solving the problems that an existing experience scale method is large in casting size precision error, and the effect of improving the casting size precision through an overall envelope density method is not obvious. The method comprises the following steps: dividing a test model into a plurality of local envelope bodies according to a contraction center ray division method, firstly calculating the local envelope density of any local envelope body, and obtaining the contraction rate of the local envelope body according to a quadratic relation curve of the local envelope density and the contraction rate; and then obtaining the shrinkage rates of all the local envelopes of the test model by adopting the same method, and converting the shrinkage rates of all the local envelopes of the test model into the shrinkage rate of the same part on the casting. The precise design method for the shrinkage size of the casting based on the local envelope density can be obtained.

Description

technical field [0001] The invention relates to the technical field of dimensional accuracy design of castings, in particular to a method for accurately designing shrinkage dimensions of castings based on local envelope density. Background technique [0002] In order to achieve the purpose of reducing the production cost and machining times of parts, when factories and enterprises are constantly looking for various methods, the emergence of near net shape technology undoubtedly provides a powerful means for this, so casting methods are also emerging in an endless stream, so as to achieve high quality and low cost. Cost-effective part forming, and its research mainly focuses on two aspects of shape control and controllability, so the precision control of shrinkage size of castings has become an indispensable part of the field of near-net shape precision shape control. Since castings are mechanically hindered by structures such as molds and cores during the shrinkage process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G06F111/04
CPCG06F30/17G06F30/23G06F2111/04
Inventor 黄西西吴士平薛祥戴贵鑫王明杰陈润瑞彭恒元
Owner HARBIN INST OF TECH
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