Vertical ceramic mold shell and molding method thereof

A technology of ceramic mold shells and molding methods, which is applied in casting molding equipment, molds, cores, etc., can solve problems that affect the quality and qualification rate of finished single crystal blades, single crystal products cannot meet technical requirements, and geometric integrity is extremely sensitive. and other problems, to achieve the effect of reducing technical difficulty, easy molding, preventing fracture and leakage of melt

Inactive Publication Date: 2015-08-12
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] We clearly know that in the directional solidification single crystal forming process, the growth of single crystal is extremely sensitive to the geometric integrity of the ceramic mold shell. If there are defects such as cracks on the ceramic mold shell, it will induce the generation of miscellaneous crystals, and finally make the desired shape The monocrystalline products cannot meet the technical requirements and are scrapped
[0007] To sum up, the existing ceramic mold shells used for single crystal blade molding are prone to non-integrity defects such as cracks, so that in the single crystal molding process with high technical requirements, it is easy to induce the nucleation and growth of miscellaneous crystals, which will eventually affect The finished product quality and qualified rate of the formed single crystal blade are reliable and poor in practicability

Method used

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  • Vertical ceramic mold shell and molding method thereof
  • Vertical ceramic mold shell and molding method thereof
  • Vertical ceramic mold shell and molding method thereof

Examples

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Embodiment 1

[0040] see figure 1 As shown, a vertical ceramic formwork is used for the pouring of single crystal blades, especially large single crystal blades, in the directional solidification process. The aforementioned ceramic formwork 3 has a blade cavity corresponding to the designed blade shape, and a crystal selector 2 is provided at the bottom of the ceramic formwork 3, and the ceramic formwork 3 and the crystal selector 2 are integrally formed. The aforementioned ceramic formwork 3 is erected above the chassis 1 through the crystal selector 2 at the bottom. Specifically, a raised and hollow connector 5 is provided in the center of the chassis 1. The connector 5 of the chassis 1 and the crystal selector 2 have a The cavities are a joint structure of adhesive combination, that is, the chassis 1 and the ceramic mold shell 3 are a combined structure formed separately. In order to ensure that the ceramic formwork 3 can be erected reliably and stably on the chassis 1, a plurality of s...

Embodiment 2

[0049] see Figure 7 As shown, a vertical ceramic formwork is used for the pouring of single crystal blades, especially large single crystal blades, in the directional solidification process. The aforementioned ceramic formwork 3 has a blade cavity corresponding to the designed blade shape, and a crystal selector 2 is provided at the bottom of the ceramic formwork 3, and the ceramic formwork 3 and the crystal selector 2 are integrally formed. The aforementioned ceramic formwork 3 is erected above the chassis 1 through the crystal selector 2 at the bottom. Specifically, a raised and hollow connector 5 is provided in the center of the chassis 1. The connector 5 of the chassis 1 and the crystal selector 2 have a The cavities are a joint structure of adhesive combination, that is, the chassis 1 and the ceramic mold shell 3 are a combined structure formed separately. In order to ensure that the ceramic formwork 3 can be erected reliably and stably on the chassis 1, a plurality of ...

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Abstract

The invention discloses a vertical ceramic mold shell and a molding method thereof. The ceramic mold shell is used for molding monocrystal blades and is erected above a base plate via a bottom crystal selector; a combined joint structure is formed between the base plate and the crystal selector, and a plurality of support columns are arranged between the base plate and the ceramic mold shell and are arranged around the outer periphery of the crystal selector. The vertical ceramic mold shell molding method comprises the following steps: respectively manufacturing the ceramic mold shell with the crystal selector, the ceramic base plate with the joint and a plurality of ceramic support columns; combining the crystal selector of the ceramic mold shell to the joint of the base plate, and bonding the combined part with refractory mortar; arranging the support columns between the base plate at the outer periphery of the crystal selector and the ceramic mold shell in a surrounding way, and bonding the bottom ends of the support columns with the base plate as well as the top ends of the support columns with the ceramic mold shell by using refractory mortar. The vertical ceramic mold shell is supported reliably, stably and firmly on the base plate, and the whole support structure is simple and compact.

Description

technical field [0001] The invention relates to a mold shell molding technology for precision melting and casting, in particular to a vertical ceramic mold shell for forming single crystal blades and a molding method for the ceramic mold shell. Background technique [0002] In order to increase the working temperature of superalloy turbine blades, equiaxed crystal blades have been gradually developed into oriented columnar crystal blades and oriented single crystal blades, and the oriented single crystal blades have increased the working temperature by 80-100°C. [0003] The forming of the single crystal blade is mainly realized through the spiral crystal selector set at the bottom of the ceramic mold shell, that is, the polycrystal that will enter the ceramic mold shell is selectively grown through the spiral crystal selector to realize the crystallization in the ceramic mold shell. Single crystals are produced. [0004] It can be seen that the molding of a single crystal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22
Inventor 赵代银曾洪马德新杨功显杨照宏张松泉何建伍林
Owner DONGFANG TURBINE CO LTD
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