Water glass type magnesium alloy fusible pattern casting process

A technology of investment casting and magnesium alloys, which is used in manufacturing tools, casting equipment, metal processing equipment, etc., and can solve the problems of large castings, poor air permeability, and coarse grains of castings.

Inactive Publication Date: 2010-03-03
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Die casting is the main process of forming magnesium alloys. Due to poor exhaust, the castings contain a lot of gas, and post-heat treatment cannot be performed to improve their mechanical properties; and the investment in equipment is large.
Magnesium alloy gypsum-shaped investment casting, due to th...

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  • Water glass type magnesium alloy fusible pattern casting process

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Experimental program
Comparison scheme
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Embodiment Construction

[0017] 1. Wax mold preparation

[0018] Molding material: wax-based molding material and resin-based molding material

[0019] Molding process parameters:

[0020] The injection temperature is 45-80°C; the molding temperature is 20-30°C.

[0021] Injection pressure 0.3 ~ 15Mpa; holding time 1 ~ 5 minutes

[0022] The mold-making room temperature is 18-30°C; the cooling water temperature of the wax mold is 18-28°C.

[0023] Design gating system and assemble wax patterns

[0024] 2. Shell making

[0025] Top coat ratio

[0026] Quartz glass powder: water glass: wetting agent = (1.15~1.5): 1.0: 0.05

[0027] Coating ratio of reinforcement layer

[0028] Bauxite: silica sand: water glass: wetting agent = (0.6 ~ 0.9): (0.3 ~ 0.5): 1.0: 0.05

[0029] Hardener: ammonium chloride: water = (20~30): (80~70)

[0030] Shell making process parameters:

[0031] Layers Paint Viscosity Sanding Size Hardener Temperature Hardening Time Drying Time (minutes)

[0032] / S (s...

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Abstract

The invention discloses a water glass type magnesium alloy fusible pattern casting process which belongs to the field of fusible pattern casting and comprises the following procedures: (1) making a wax pattern; (2) making a water glass type shell suitable for making magnesium by using water glass as an adhesive and using quartz powder and aluminum bauxite as powder materials; (3) melting by the melting process of the magnesium alloy; (4) casting; and (5) cleaning a cast. The viscidities of a surface layer of the type shell and a reinforcing layer are higher than the viscidities of a traditional process; the number of the layers is less than that of a traditional process; hot water is used for dewaxing; compared with the traditional process, hardening processing is not added; baking temperature is largely lower than that of the traditional process; and the hot water of boric acid is used for immersing the type shell for avoiding oxidizing the magnesium alloy to replace gas protection, thereby reducing substance consumption and energy consumption, improving the environment and reducing the production cost. The invention replaces a magnesium alloy gypsum type fusible pattern casting process to solve the problem of large pits and crystal grains on the surface of the cast, replaces a sand casting process to solve the problems of high roughness and low dimension precision of the surface of a diamantine cast and replaces a die-casting process to solve the problem that a die cast of the magnesium alloy cannot be thermally treated. The invention is applied to form the cast of the magnesium alloy.

Description

technical field [0001] Magnesium Alloy Casting Background technique [0002] The forming processes of magnesium alloy castings include: sand casting, die casting [1], semi-solid forming is under research [2], investment casting is a near-net forming process, and its casting mold can be divided into water glass type, silica sol Type, ethyl silicate type, compound type and gypsum type. It is mainly used in the forming of various steel, aluminum alloy and copper alloy castings [3][4]. Magnesium alloy gypsum investment casting report [5]. So far, there is no report on investment casting process of water glass type magnesium alloy. [0003] Die casting is the main process of forming magnesium alloys. Due to poor exhaust, the castings contain a lot of gas, and post-heat treatment cannot be performed to improve their mechanical properties; and the investment in equipment is large. Magnesium alloy gypsum-shaped investment casting, due to the slow heat dissipation and poor air pe...

Claims

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Application Information

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IPC IPC(8): B22D21/04B22C9/04
Inventor 白聿钦
Owner HENAN POLYTECHNIC UNIV
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