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Method for testing crack sensitivity of precision steel casting and test model thereof

A technology of crack sensitivity and test model, applied in the field of metal casting, can solve the problems of single structure, unable to achieve sufficient and reasonable, crack sensitivity can not be reflected at the same time, etc., to achieve the effect of low cost and reduce crack defects

Inactive Publication Date: 2013-05-08
HUBEI UNIV OF AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the complexity of the casting structure, the structure of the above test model is relatively simple and single. With this test method, the crack sensitivity of multiple different structural positions of the same casting cannot be reflected at the same time, especially for precision casting. , it is difficult to fully and accurately test the crack sensitivity of precision and complex castings. Naturally, the measures to prevent and eliminate cracks in the production of castings derived from this are not sufficient and reasonable.

Method used

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  • Method for testing crack sensitivity of precision steel casting and test model thereof
  • Method for testing crack sensitivity of precision steel casting and test model thereof
  • Method for testing crack sensitivity of precision steel casting and test model thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] According to the material components designed in Table 1 and the pouring process parameters shown in Table 2, the test model is manufactured and pressed according to the normal investment casting process—pressed wax mold—set tree—shell making—demoulding— — roasting — melting and casting — cleaning;

[0040] Select 30 cleaned test models, and use cast steel shots with a hardness of 40HRC for shot blasting. Grease, dirt, scale, rust, corrosion products, oxides and others are not allowed to exist on the surface of the cleaned test models impurities;

[0041] After the shot blasting treatment, the surface of the test model, including the fillet transition, is cleaned with a colored crack cleaner;

[0042] Spray the crack observation part of the model with colored penetrant and keep it wet for 5 minutes;

[0043] Wipe off the excess penetrant on the surface of the test model, and clean the observation part with cleaning agent;

[0044] After the surface is dry, spray a colo...

Embodiment 2

[0054] According to the material components designed in Table 4, the pouring process parameters are the same as in Example 1, and the test model is manufactured according to the normal investment casting process. Pressing the mold - pressing the wax mold - forming the tree - making the shell - demoulding - — roasting — melting and casting — cleaning;

[0055] (2) The cleaned test model is shot blasted with cast steel shots with a hardness of 45HRC. Grease, dirt, scale, rust, corrosion products, oxides and other impurities are not allowed to exist on the surface of the cleaned test model;

[0056] (3) After the shot peening treatment is completed, the surface of the test model, including the fillet transition, is cleaned with a colored crack cleaner;

[0057] (4) Spray the observation part of the test model with colored penetrant and keep it moist for 10 minutes;

[0058] (5) Wipe off the excess penetrant on the surface of the test model, and clean the observation part with cl...

Embodiment 3

[0067] According to the material components designed in Table 6, the pouring process parameters are the same as in Example 1, and the manufacturing of the test model is carried out according to the normal investment casting process. Pressing the mold - pressing the wax mold - forming the tree - making the shell - demoulding - — roasting — melting and casting — cleaning;

[0068] (2) The cleaned test model is shot blasted with cast steel shots with a hardness of 50HRC. Grease, dirt, scale, rust, corrosion products, oxides and other impurities are not allowed to exist on the surface of the cleaned test model;

[0069] (3) After the shot peening treatment is completed, the surface of the test model, including the fillet transition, is cleaned with a colored crack cleaner;

[0070] (4) Spray the observation part of the test model with colored penetrant and keep it moist for 8 minutes;

[0071] (5) Wipe off the excess penetrant on the surface of the test model, and clean the obser...

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Abstract

The invention relates to a method for testing the crack sensitivity of a precision steel casting and a model thereof. The method is suitable for the crack sensitivity test of material components and casting process parameters, and the model is a grid type; different fillet sizes are adopted at the transition parts of the model grid, and grid rib plates are different in thickness; and the model is cast and shot blasting is performed according to normal processes, a crack observing part is determined, and the crack at the part is detected and evaluated. The model and test method provided by the invention can effectively predict the cracking trend of different materials and process parameters in the precision casting process, and also can provide reference to the design of the casting fillet size so as to guarantee the rationality in designing the casting structure, the casting material components and the casting process parameters, reduce the cracking defect of the casting and obtain a high-quality low-cost precision steel casting.

Description

technical field [0001] The invention belongs to the technical field of metal casting, and relates to a method for testing crack sensitivity of investment castings, in particular to a method for testing crack sensitivity of precision cast steel castings and a test model thereof. Background technique [0002] Cracks are one of the typical defects in the manufacturing process of castings, especially in high-strength thin-walled steel castings of precision casting. With the development of investment casting, there are more and more extreme parts such as complex parts, thin-walled parts and rod-shaped parts, and the tendency of crack defects in investment castings is also increasing. The research on the causes and mechanism of casting cracks is helpful for manufacturers to take corresponding measures to prevent and eliminate cracks in casting production, and has important application value in providing technical guarantee for the production of qualified castings. [0003] In ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/91
Inventor 张红霞杨体升吴建刚
Owner HUBEI UNIV OF AUTOMOTIVE TECH
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