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Preparation method of casting mold for reducing casting stress of large abrupt wall thickness type nickel-base superalloy casting obtained by anti-gravity casting

A nickel-based high-temperature alloy and anti-gravity casting technology, which is applied to casting molding equipment, casting molds, and casting mold components, can solve the problems of high residual stress in casting, and achieve the effect of high mold strength and improved mold filling ability

Active Publication Date: 2014-07-30
HARBIN INST OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of high residual stress in the casting of large nickel-based superalloy castings with abrupt wall thickness changes, and provides a method for preparing molds for reducing the casting stress of large nickel-based superalloy castings with sudden wall thickness changes in antigravity casting

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0017] Specific Embodiment 1: In this embodiment, a method for preparing a mold for reducing the casting stress of large nickel-based superalloy castings with sudden wall thickness changes in anti-gravity casting, the specific steps are as follows:

[0018] Step 1. Paste the wax pattern in paint A, sprinkle sand powder B, and dry to obtain the surface layer;

[0019] Step 2. Soak the zirconia fiber net in the paint A, while ultrasonically vibrating for 1h to 2h, then wrap the zirconia fiber net on the surface layer surface obtained in step 1, then sprinkle fine back sand and dry;

[0020] Step 3, repeat step 2 1 to 4 times to prepare a buffer layer with a multi-layer structure;

[0021] Step 4. Slurry the buffer layer prepared in step 3, sprinkle 275 mesh corundum powder back sand, and dry; then hang slurry, sprinkle 175 mesh corundum powder back sand, and dry; then hang slurry, sprinkle 125 mesh zircon sand, and dry ; Hang slurry again, sprinkle 80-mesh zircon sand, and dry;...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the coating A described in step 1 is formed by mixing the sand powder material B and the binder according to the mass ratio of 2.7:1, wherein the sand powder material B is made by mixing 400 mesh zirconia and corundum powder at a mass ratio of 1:1, and the binder is non-quick-drying silica sol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment differs from Embodiment 1 in that the particle size of the fine back sand in step 2 is smaller than the thickness of a single layer of zirconia fiber net. Others are the same as in the first embodiment.

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Abstract

The invention relates to a preparation method of a casting mold for reducing the casting stress of a large abrupt wall thickness type nickel-base superalloy casting obtained by anti-gravity casting, belongs to the field of high-activity metal melting and forming, and aims to solve the problem about restriction on high residual casting stress of the large abrupt wall thickness type nickel-base superalloy casting. The method comprises the following steps: (1) coating a wax pattern with slurry, scattering sand powder B, and drying to obtain a surface layer; (2) coating the slurry, wrapping the surface of the surface layer obtained in the step (1) with a zirconia fiber mesh, scattering fine back sand, and drying; (3) repeatedly executing the step (2); (4) coating the slurry, and scattering back sand to obtain a back layer; (5) de-waxing and roasting; and (6) filling a sand box, hardening and drying. The prepared casting mold is high in strength, and can adapt to high anti-gravity forming pressure, so that the mold-filling capacity of superalloy is greatly improved. The method is used for preparing the casting mold.

Description

technical field [0001] The invention relates to a casting mold preparation method for reducing the casting stress of large nickel-based high-temperature alloy castings with abrupt wall thickness changes in anti-gravity casting, and belongs to the field of high-activity metal smelting and forming. Background technique [0002] Large-scale nickel-based superalloy castings with abrupt wall thickness are a very important category of castings in the aerospace field. Many, the casting method currently used can no longer meet the requirements of casting forming. Anti-gravity casting has unique advantages in solving the forming of large-scale nickel-based superalloy castings with sudden wall thickness changes, but at the same time, the casting molds used in the forming of such castings put forward higher requirements. Due to the thin wall of the main body of the casting, if the strength of the mold shell is not enough, the thin wall part of the cavity may be deformed when the shell...

Claims

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Application Information

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IPC IPC(8): B22C9/03
Inventor 邹鹑鸣魏尊杰王宏伟朱兆军
Owner HARBIN INST OF TECH
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