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Core for precision casting, manufacturing method thereof, mold for precision casting

A technology of precision casting and manufacturing methods, which is applied in the direction of casting molding equipment, molds, cores, etc., and can solve the problems of core cracking, low strength, low strength at high temperature, etc., and achieve the effect of preventing cracking and improving strength

Inactive Publication Date: 2017-04-12
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the current mandrels are manufactured with an emphasis on alkali solubility, so there are problems such as low high-temperature strength.
In addition, in the injection molding method, there are many holes in the surface of the sintered core after the molding, so the strength is low. In addition, there is a problem that the holes may become the starting point, which may lead to mold during casting. core rupture

Method used

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  • Core for precision casting, manufacturing method thereof, mold for precision casting
  • Core for precision casting, manufacturing method thereof, mold for precision casting
  • Core for precision casting, manufacturing method thereof, mold for precision casting

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no. 1 approach

[0034] figure 1 It is a cross-sectional structure diagram of a core for precision casting.

[0035] The core for precision casting of the present invention is formed on the surface of a sintered core body for precision casting (hereinafter referred to as "core body") mainly composed of siliceous particles to form two types of silicon particles with different particle diameters. It is made of a coating layer of solid material.

[0036] Such as figure 1 As shown in the upper part of the cross-sectional view of the core body of the sintered body, many pores 18c are formed on the surface 18b of the core body 18a during sintering.

[0037] In the present invention, as figure 1 As shown in the lower part of , by covering the hole 18c formed in the surface with the coating layer 19a, the hole 18c can be blocked.

[0038] Here, the core main body 18a is mainly composed of siliceous particles, such as fused silica (SiO 2 )form.

[0039] This core main body 18a is manufactured by ...

no. 2 approach

[0098] In this embodiment, since the structure of the investment casting core is the same as that of the first embodiment, referring to the drawings described in the first embodiment ( figure 1 and 2 )Be explained.

[0099] figure 1 It is a cross-sectional structure diagram of a core for precision casting.

[0100] The core for precision casting of the present invention is formed on the surface of a sintered core body for precision casting (hereinafter referred to as "core body") mainly composed of siliceous particles to form two types of silicon particles with different particle diameters. It is made of a coating layer of solid material.

[0101] Such as figure 1 As shown in the upper section of the cross-sectional view of the core body of the sintered body shown in , many pores 18c are generated during sintering on the surface 18b of the core body 18a.

[0102] In the present invention, as figure 1 As shown in the lower part of , by covering the hole 18c formed on the ...

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Abstract

On the surface of the sintered investment casting core body (18a) mainly composed of siliceous particles, a coating layer (19a) consisting of silicon alkoxide alone or a mixed alkoxide of silicon alkoxide and aluminum alkoxide is formed. formed, thus blocking the pores (18c) formed in the surface. As a result, it is possible to prevent the core from being broken during casting.

Description

technical field [0001] The invention relates to a mold core for precision casting and a manufacturing method thereof, and a casting mold for precision casting. Background technique [0002] Examples of precision castings include rotor blades for gas turbines. In a gas turbine, a working fluid is combusted by a combustor to form a high-temperature and high-pressure working fluid, and the turbine is rotated by the working fluid. That is, the working fluid compressed by the compressor is combusted by the combustor to increase energy, and the energy is recovered by the turbine to generate rotational force, thereby generating electricity. The turbine section is provided with a turbine rotor, and at least one gas turbine rotor blade is provided on the outer periphery of the turbine rotor. [0003] Here, the gas turbine blades are exposed to high temperatures. As a countermeasure against this, a cooling medium for cooling is passed through the gas turbine rotor blades. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10B22C3/00B22C9/04
CPCB22C3/00B22C9/04B22C9/10B22C9/24B22C9/12B22C9/18B22C9/22F01D5/28
Inventor 小熊英隆森一刚冈田郁生下畠幸郎
Owner MITSUBISHI HEAVY IND LTD