Ceramic die shell capable of eliminating casting hot crack defects of section-variable parts and molding method thereof

A technology of ceramic mold shell and variable cross-section, applied in casting molding equipment, mold, mold composition, etc., can solve the problem of not considering the ceramic mold shell structure and molding process, to eliminate hot crack defects, improve structural strength, good stability

Active Publication Date: 2017-08-04
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the general research focus on the elimination of hot crack defects in variable cross-section parts in the precision casting process is on the selection of alloy components in precision casting and the pouring process of alloy melts, and does not consider the structure of ceramic mold shells. Study on the Influence of Forming Process on Hot Cracking Defects

Method used

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  • Ceramic die shell capable of eliminating casting hot crack defects of section-variable parts and molding method thereof
  • Ceramic die shell capable of eliminating casting hot crack defects of section-variable parts and molding method thereof
  • Ceramic die shell capable of eliminating casting hot crack defects of section-variable parts and molding method thereof

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Effect test

Embodiment 1

[0029] see figure 1 As shown, the present invention is a variable cross-section part-a ceramic mold shell for precision casting of a heavy-duty gas turbine guide vane. The ceramic mold shell 1 has a casting cavity 2 matching the design structure of the turbine guide vane.

[0030] The above-mentioned casting cavity 2 has an inner edge plate part, an airfoil body part and an outer edge plate part according to the turbine guide vane, and the connection transition between the inner edge plate part and the airfoil body part respectively forms a cross-sectional mutation structure, that is, the inner edge plate part , The cross-sectional area of ​​the outer edge plate portion is larger than the cross-sectional area of ​​the airfoil portion. When casting molten steel in the casting cavity 2 with such a structure for precision casting, hot knot effects will occur at the sudden change in cross section—that is, the solidification process at the sudden cross section is slower than that o...

Embodiment 2

[0041] The invention relates to a ceramic mold shell for precise casting of a variable cross-section part-turbine blade, and the ceramic mold shell has a casting cavity matching the design structure of the turbine blade.

[0042] According to the turbine blade, the above-mentioned casting cavity has a shroud, a blade body and a tenon root, and a cross-sectional mutation structure is formed at the connection transition between the blade crown, tenon root and blade body, that is, the cross-sectional area of ​​the blade crown and tenon root is larger than that of the blade body cross-sectional area. When casting molten steel in such a casting cavity for precision casting, hot knot effects will occur at the sudden change in section—that is, the solidification process at the sudden change in cross section is slower than that of the surrounding area, so there will be hot crack defects including porosity. That is to say, according to the solidification characteristics of the molten s...

Embodiment 3

[0053] The invention relates to a variable cross-section part-a ceramic mold shell for precision casting of a small T-shaped high-temperature alloy part. The ceramic mold shell has a casting cavity matching the design structure of the T-shaped high-temperature alloy part.

[0054] The above-mentioned casting cavity has a crown and a body according to the T-shaped superalloy part, and a cross-sectional abrupt structure is formed at the connection transition between the crown and the body, that is, the cross-sectional area of ​​the crown is larger than that of the body. When casting molten steel in such a casting cavity for precision casting, hot knot effects will occur at the sudden change in section—that is, the solidification process at the sudden change in cross section is slower than that of the surrounding area, so there will be hot crack defects including porosity. That is to say, according to the solidification characteristics of the molten steel in the aforementioned cas...

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Abstract

The invention discloses a ceramic die shell capable of eliminating casting hot crack defects of section-variable parts and a molding method thereof. The ceramic die shell is provided with a casting cavity matched with a section-variable part design structure; corresponding hot spot areas are arranged in the casting cavity according to coagulation properties of molten steel in the casting cavity in the casting process; concave grooves are formed in positions corresponding to the hot spot areas on the external surface of the ceramic die shell; the width and the length of the concave grooves correspond to the hot spot areas in the casting cavity. Through the ceramic die shell, the structure strength is ensured; meanwhile, the thickness of the ceramic die shell can be effectively, reliably and differentially controlled; the shrinkage stress of the hot spot positions is effectively eliminated; the generation of hot crack defects is avoided.

Description

technical field [0001] The invention relates to the investment pattern technology of the precision casting process, in particular to a ceramic mold shell that can eliminate casting hot crack defects of variable cross-section parts in the precision casting process, and a molding method of the ceramic mold shell. Background technique [0002] The no-reserve investment casting process is the most commonly used technology for forming superalloy parts (such as aeroengine blades or industrial gas turbine blades, etc.), and the superalloy parts formed by it have good high-temperature mechanical properties, and are suitable for industrial equipment with harsh service conditions ( Such as aero engines or industrial gas turbines, etc.) have been widely used. [0003] However, during the molding process of high-temperature alloy parts, casting defects often appear on casting blanks in the no-reserve investment casting process, which is especially prominent in precision casting for part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22
CPCB22C9/04B22C9/22
Inventor 王海伟张琼元杨啊涛张建平巩秀芳杨功显王海洋张松泉
Owner DONGFANG TURBINE CO LTD
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