Method for determining shrinking percentages of investment pattern precision casting mold

A technology for mold shrinkage and determination method, which is applied in the directions of casting molds, casting mold components, manufacturing tools, etc., can solve the problems of difficult casting accuracy, simple roughness, etc., to achieve the effect of improving accuracy, saving workload, and enriching the accuracy of design details

Inactive Publication Date: 2015-04-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former mainly controls the error by setting the anti-deformation shrinkage rate for the key parts, but the determination of the shrinkage rate for the key parts of the mold usually depends on the experience of the designer, and it can only be set for a few key dimensions, which is relatively simple and rough
As the shape of castings becomes more and more complex, this anti-deformation mold design mode through a few simple shrinkage ratios increasingly shows the shortcomings of being too broad and empirical, and in fact it is becoming more and more difficult to obtain through this design mode. Satisfactory casting accuracy

Method used

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  • Method for determining shrinking percentages of investment pattern precision casting mold
  • Method for determining shrinking percentages of investment pattern precision casting mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] step one:

[0024] Moldflow was used to establish the model of the oblique support plate of the aero-engine casing, and the deformation cloud image of the investment mold preparation stage was analyzed and obtained. The simulated size of the flange outer diameter on the outer ring of the wax mold is 1002mm.

[0025] Step two:

[0026] ABAQUS is used to build a model for the casing preparation stage of the casing, the wax pattern cloud diagram deformed in the previous step is used as the input of this model to obtain the cavity deformation cloud diagram of the casing, and the outer diameter of the flange on the outer ring is measured to be 1005mm.

[0027] Step 3: Use ProCAST to establish a model for the alloy solidification stage of the casing. The inner cavity of the deformed shell in the previous step is used as the input of this model to obtain a cloud image of the deformed casting. The outer diameter of the flange on the outer ring is measured to be 998mm.

[0028] Step 4: U...

Embodiment 2

[0031] Step 1: Use Moldflow to establish the engine turbine model, analyze and obtain the deformation during the investment mold preparation stage. The measured maximum diameter of the wax mold is 257mm.

[0032] Step 2: Use ABAQUS to build a model for the turbine shell preparation stage, and use the wax pattern cloud image deformed in the previous step as the input of this model to obtain the shell cavity deformation cloud image. The measured maximum diameter is 259.2mm.

[0033] Step 3: Use ProCAST to establish a model for the solidification stage of the turbine alloy, and use the deformed shell cavity in the previous step as the input of this model to obtain a cloud image of the deformed casting. The measured maximum diameter is 260mm.

[0034] Step 4: Apply MSE.Marc to build a model for the heat treatment stage of the turbine, use the castings after solidification and deformation in the previous step as the input of this model, and obtain the cloud map of the castings after heat ...

Embodiment 3

[0037] Step 1: Use Moldflow to build a gas turbine triple blade model, and analyze and obtain the deformation during the investment mold preparation stage. Obtain the deformation profile of the blade wax mold after shrinking.

[0038] Step 2: Use ABAQUS to build a model for the preparation stage of the shell of the blade, and use the deformed wax pattern cloud image of the previous step as the input of this model to obtain the deformation cloud image of the shell cavity.

[0039] Step 3: Use ProCAST to build a model for the alloy solidification stage of the blade, and use the deformed shell cavity in the previous step as the input of this model to obtain a cloud image of the deformed casting.

[0040] Step 4: Use MSE.Marc to establish a model for the heat treatment stage of the blade, and use the castings after solidification and deformation in the previous step as the input of this model to obtain the cloud map of the castings after heat treatment.

[0041] Step 5: Cut the deformed p...

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Abstract

The invention relates to a method for determining the shrinking percentages of an investment pattern precision casting mold. The method comprises the steps of (1) establishing numerical analysis models for various operation stages of investment casting, (2) taking the analog output of a previous numerical analysis model as the analog input of a next numerical analysis model, establishing an error flow of the whole process and obtaining the final casting simulation deformation result, (3) performing reversible deformation to a mold design stage from the final casting simulation deformation result and determining the profile shrinking percentage of each key dimension. Compared with the prior art, the method has the advantages that the error flow is established or the error evolution of the key dimensions, more accurate and detailed shrinking percentages can be obtained based on the backtracking of the error flow, and the design detail accuracy of the mold design can be enriched; besides, pre-deformation is performed on the error evolution of the whole process of the castings at the source of the mold design, and therefore, the correction work on the castings in the subsequent steps can be saved, the workload is saved and the precision of the castings is improved.

Description

Technical field [0001] The invention relates to the field of investment casting, in particular to a method for determining the shrinkage rate of investment casting molds. Background technique [0002] With the improvement of energy utilization efficiency, more and more parts are designed based on complex aerodynamic principles or fluid dynamics, their shapes are complex, and the requirements for integration and precision are higher. Investment casting can accurately cast parts with extremely complex shapes as a whole, so it has become the main method or even the only method to produce complex metal components. However, the investment casting process is complicated and the process is lengthy (such as figure 1 (Shown), from the initial design of the casting to the preparation of the investment mold, the preparation of the shell, the solidification of the casting and the final post-processing, each process introduces size tolerance and deformation (hereinafter referred to as error) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50B22C9/04
Inventor 何博汪东红李飞祝国梁孙宝德王俊
Owner SHANGHAI JIAO TONG UNIV
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