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Thin-walled circular type investment casting shell and preparation method thereof

A technology of thin-walled rings and investment molds, which is applied to casting molding equipment, molds, cores, etc., and can solve problems such as low dimensional accuracy, poor surface quality, and casting breakouts

Active Publication Date: 2015-02-25
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a thin-walled ring-shaped investment mold to solve the defects of the existing high-temperature alloy large-scale thin-walled complex ring-shaped casting shell manufacturing process, such as casting breakouts, poor surface quality, difficult cleaning of castings, and low dimensional accuracy. Casting mold shell and its preparation method

Method used

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  • Thin-walled circular type investment casting shell and preparation method thereof
  • Thin-walled circular type investment casting shell and preparation method thereof
  • Thin-walled circular type investment casting shell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Preparation of the shell of a large thin-walled annular vacuum casting of a certain K4648 superalloy

[0081] 1. The shell composition is as follows:

[0082] (1) Surface layer refractory powder specifications:

[0083] chemical composition:

[0084]

[0085] Particle size: D95=45-65μm, D50=9-14μm, D10=1-2μm;

[0086] (2) Specifications of the back layer refractory powder:

[0087] chemical composition:

[0088]

[0089] Particle size: D95=45-65μm, D50=10-18μm, D10=1-2.5μm;

[0090] (3) Hanging sand material:

[0091] (3.1) Sand specifications of the first to fourth layers:

[0092] chemical composition:

[0093] Al 2 o 3 ≥99.7%

[0094] Fe 2 o 3 ≤0.09%

[0095] Na 2 O≤0.21%

[0096] Sand size of the first layer: 90-120 mesh,

[0097] Sand size of the second layer: 90-120 mesh,

[0098] Sand size of the third layer: 70-90 mesh,

[0099] Sand size of the fourth layer: 46-70 mesh;

[0100] (3.2) Sand specifications of the 5th t...

Embodiment 2

[0146] Preparation of the shell of a large thin-walled annular vacuum casting of a certain K4169 superalloy

[0147] 1. The shell composition is as follows:

[0148] (1) Surface layer refractory powder specifications:

[0149] chemical composition:

[0150]

[0151] Particle size: D95=45-65μm, D50=9-14μm, D10=1-2μm;

[0152] (2) Specifications of the back layer refractory powder:

[0153] chemical composition:

[0154]

[0155] Particle size: D95=45-65μm, D50=10-18μm, D10=1-2.5μm;

[0156] (3) Hanging sand material:

[0157] (3.1) Sand specifications of the first to fourth layers:

[0158] chemical composition:

[0159] Al 2 o 3 ≥99.7%

[0160] Fe 2 o 3 ≤0.09%

[0161] Na 2 O≤0.21%

[0162] Sand size of the first layer: 90-120 mesh,

[0163] Sand size of the second layer: 90-120 mesh,

[0164] Sand size of the third layer: 70-90 mesh,

[0165] Sand size of the fourth layer: 46-70 mesh;

[0166] (3.2) Sand specifications of the 5th t...

Embodiment 3

[0213] Preparation of the shell of a large thin-walled annular vacuum casting of a certain K438 superalloy

[0214] 1. The shell composition is as follows:

[0215] (1) Surface layer refractory powder specifications:

[0216] chemical composition:

[0217]

[0218] Particle size: D95=45-65μm, D50=9-14μm, D10=1-2μm;

[0219] (2) Specifications of the back layer refractory powder:

[0220] chemical composition:

[0221]

[0222] Particle size: D95=45-65μm, D50=10-18μm, D10=1-2.5μm;

[0223] (3) Hanging sand material:

[0224] (3.1) Sand specifications of the first to fourth layers:

[0225] chemical composition:

[0226] Al 2 o 3 ≥99.7%

[0227] Fe 2 o 3 ≤0.09%

[0228] Na 2 O≤0.21%

[0229] Sand size of the first layer: 90-120 mesh,

[0230] Sand size of the second layer: 90-120 mesh,

[0231] Sand size of the third layer: 70-90 mesh,

[0232] Sand size of the fourth layer: 46-70 mesh;

[0233] (3.2) Sand specifications of the 5th to...

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Abstract

The invention relates to a thin-walled circular type investment casting shell and a preparation method thereof, aiming at solving the defects that for the existing high-temperature alloy large thin-walled complicated circular type casting shell production technology, the casting pouring steel leaks, the surface quality is bad, the casting is difficult to clean, the size precision is low and the like, and belonging to the technical field of an aeroengine. A shell is made of new surface layer refractory powder, a back layer refractory powder and a sand lining material, and the invention provides a formula for all layers of paints of the shell; in addition, the invention further provides a manufacturing method of the thin-walled circular type investment casting shell, and the manufacturing method comprises the following steps: performing oil removal treatment on the surface of a wax mold module, carrying out paint preparation, sand lining and drying, shell dewaxing and shell roasting procedures, and particularly, the reinforcement step is added during the sand lining process, so that the shell has excellent high-temperature performance and good collapse performance at low temperature, and can bear molten metal with the pouring temperature being higher than 1600 DEG C, and can be used for casting high-temperature alloy large thin-walled circular vacuum castings such as K4169, K438, K418 and K4648.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a thin-walled annular investment casting shell and a preparation method thereof. Background technique [0002] Investment casting is an advanced technology near net shape. The products obtained are precise and complex, and can be used directly without or with little processing. It is widely used. The dimensional accuracy of investment castings is high, generally up to CT4-6 (CT10-13 for sand casting, CT5-7 for die casting), and the surface finish is also high, which can reduce machining work, but only in parts with higher requirements It is enough to leave a little processing allowance, and even some castings only leave a grinding and polishing allowance, and can be used without machining. Moreover, the investment casting method can cast complex castings of various alloys, especially high-temperature alloy castings, such as jet engine blades, whose streamlined o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04C04B12/04
CPCB22C1/00B22C3/00B22C9/04
Inventor 李波刘艳邹建波李雪潘国志
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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