Precision investment casting method for magnesium alloy

A technology of investment precision casting and magnesium alloy, which is applied in the direction of casting molding equipment, casting molds, and casting mold components. It can solve the problems of poor anti-oxidation measures, achieve oxidation prevention, ensure surface finish, and ensure dimensional accuracy and surface finish. Effect

Active Publication Date: 2016-03-30
宝鸡金航华颢新材料技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of poor anti-oxidation measures in existing investment casting methods, the present invention provides a magnesium alloy investment casting method

Method used

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  • Precision investment casting method for magnesium alloy
  • Precision investment casting method for magnesium alloy
  • Precision investment casting method for magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) 3D laser printing wax model.

[0021] Use commercial software to establish a 3D model of the casting in the computer, and use 3D selective laser printing rapid prototyping equipment to manufacture the RP shape of the casting. The RP pattern material is PSB powder (glass transition temperature is 70-98°C, decomposition temperature >300°C). Put the RP pattern into a water bath type wax melting insulation barrel for wax dipping treatment, and take it out after dipping for 3 minutes. After 3 minutes, carry out the second dip coating, and take it out after 2 minutes. The wax-soaked RP pattern is manually polished in water with No. 600 sandpaper, and then the RP pattern is degreased with washing powder or detergent, rinsed and dried. Subsequently, the casting gating system is assembled and welded according to the casting process.

[0022] (2) Shell making.

[0023] Choose ZrO 2 As the best surface sand material and coating powder. Wherein, the proportioning of the s...

Embodiment 2

[0033] (1) 3D laser printing wax model.

[0034] Use commercial software to establish a 3D model of the casting in the computer, and use 3D selective laser printing rapid prototyping equipment to manufacture the RP shape of the casting. The RP pattern material is PSB powder (glass transition temperature is 70-98°C, decomposition temperature >300°C). Put the RP pattern into the water-bath type wax melting insulation barrel for wax dipping treatment, and take it out after dipping for 2 minutes. After 3 minutes, carry out the second dip coating, and take it out after 1 minute. The wax-soaked RP pattern is manually polished in water with No. 600 sandpaper, and then the RP pattern is degreased with washing powder or detergent, rinsed and dried. Subsequently, the casting gating system is assembled and welded according to the casting process.

[0035] (2) Shell making.

[0036] Choose ZrO 2 As the optimal surface layer sand material and coating powder, the ratio of the surface l...

Embodiment 3

[0046] (1) 3D laser printing wax model.

[0047] Use commercial software to establish a 3D model of the casting in the computer, and use 3D selective laser printing rapid prototyping equipment to manufacture the RP shape of the casting. The RP pattern material is PSB powder (glass transition temperature is 70-98°C, decomposition temperature >300°C). Put the RP pattern into a water bath type wax melting insulation barrel for wax dipping treatment, and take it out after dipping for 3 minutes. After 3 minutes, carry out the second dip coating, and take it out after 2 minutes. The wax-soaked RP pattern is manually polished in water with No. 600 sandpaper, and then the RP pattern is degreased with washing powder or detergent, rinsed and dried. Subsequently, the casting gating system is assembled and welded according to the casting process.

[0048] (2) Shell making.

[0049] Choose ZrO 2 As the optimal surface layer sand material and coating powder, the ratio of the surface la...

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Abstract

The invention discloses a precision investment casting method for magnesium alloy, which is used for solving the technical problem that the conventional investment casting method is poor in oxidization prevention measures. According to the technical scheme, the method comprises the following steps: preparing a wax mould by adopting 3D laser printing, using ZrO2 as a surface layer and second layer sand material, and desorbing resin by using a roasting method to be sufficiently burned; after roasting, immersing a mould shell cavity in a hot saturated boric acid aqueous solution with the temperature being 90-100 DEG C; before pouring, introducing mixed protection gas with the volume fraction ratio of HFC134a to Ar being 30 to 70; in the pouring process, uninterruptedly sprinkling appropriate sulfur to the magnesium alloy ladle pouring liquid level and a riser, and thus effectively preventing magnesium alloy oxidation and burning. As the wax mould is prepared by adopting 3D laser printing, the dimensional precision and the surface smoothness of magnesium alloy casts are ensured. ZrO2 is used to prevent magnesium alloy melt from reacting with a casting mould. The resin is desorbed by using the roasting method to be sufficiently burned, ash content and slag are not left, and the surface smoothness and the internal quality of the magnesium alloy casts are ensured.

Description

technical field [0001] The invention relates to an investment casting method, in particular to a magnesium alloy investment precision casting method. Background technique [0002] The document "Application Publication No. CN101862811A Chinese Invention Patent" discloses a rapid investment casting method for complex thin-walled parts. This method uses polystyrene rapid prototyping technology to produce polystyrene foam plastic investment casting pattern and pouring system, improves the surface quality of the casting pattern through surface low-temperature wax infiltration process, roasts at high temperature to completely gasify the foam plastic, and finally pours The metal gets precision casting. This method has good adaptability to aluminum alloys. However, this method does not have any anti-oxidation measures during the casting process, and is not suitable for magnesium alloys. This is due to the extremely active nature of the magnesium alloy, which will react with the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C3/00B22D21/04
CPCB22C3/00B22C9/04B22C9/043B22D21/04
Inventor 杨光昱罗时峰刘少军赵明介万奇
Owner 宝鸡金航华颢新材料技术研究院有限公司
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