Foam pattern surface film forming method for lost foam casting

A technology of foam pattern and film forming method, which is applied in the direction of casting and molding equipment, etc., can solve the problems of high price and long film forming time of film forming materials, and achieve the effects of low cost, reduced film forming time and improved surface quality

Inactive Publication Date: 2012-03-07
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for forming a film on the surface of a foam pattern for lost-form shell casting, which solves the problem that the film-forming material of the foam mold takes a long time to form a film and is expensive in the existing method for forming a film on the surface of a foam pattern. Improve the surface quality of foam molds, thereby improving the surface quality of shells and castings

Method used

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  • Foam pattern surface film forming method for lost foam casting
  • Foam pattern surface film forming method for lost foam casting
  • Foam pattern surface film forming method for lost foam casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, the sequence includes:

[0023] 1. Film-forming material preparation step: prepare wax-based organic composite material, the mass percentage of its raw material is: paraffin 100%, the rest is 0; wax-based organic composite material has a melting point range of 40°C;

[0024] Then heat and melt the wax-based organic composite material to form a miscible substance at a heating temperature of 60°C;

[0025] 2. Film forming step: completely immerse the unheated foam pattern into the mixed material, take it out after soaking for 5 seconds and slightly shake or shake to remove the excess liquid mixed material, and form a uniform film on the foam pattern after cooling Layer, see image 3 As shown, a smooth thin layer is formed on the surface of the foam mold, and the grooves between the beads of the foam mold are filled.

[0026] In the film forming step, the foam-like foam molding material is expandable polystyrene resin beads.

Embodiment 2

[0027] Example 2, the sequence includes:

[0028] 1. Film-forming material preparation step: prepare wax-based organic composite material, the mass percentage of its raw materials is: ozokerite 80%, stearic acid 15%, polyethylene 5%, and wax-based organic composite material has a melting point of 55°C;

[0029] Then heat and melt the wax-based organic composite material to form a miscible, heating temperature is 70 ℃;

[0030] 2. Film forming step: completely immerse the foam pattern heated at 20°C into the mixed material, take it out after soaking for 35s and slightly shake or shake to remove the excess liquid mixed material, and form a uniform film on the foam pattern after cooling Layer, use the foam pattern to obtain a picture of the shell such as Figure 4 As shown, the surface of the shell is smooth, and the shell is obtained compared with the untreated foam appearance (see figure 2 ) The surface quality is greatly improved.

[0031] In the film forming step, the foam-like foa...

Embodiment 3

[0032] Embodiment 3, the sequence includes:

[0033] 1. Film-forming material preparation steps: prepare wax-based organic composite material, the mass percentage of its raw materials is: Sichuan wax 60%, stearic acid 30%, rosin 10%, and the wax-based organic composite material has a melting point of 70°C;

[0034] Then heat and melt the wax-based organic composite material to form a miscible substance at a heating temperature of 80°C;

[0035] 2. Film forming step: completely immerse the foam pattern heated at 70°C into the mixture, soak it for 60 seconds, take it out and shake or shake it slightly to remove the excess liquid mixture, and form a uniform film on the foam pattern after cooling Layer, the surface roughness Ra of the casting obtained is 1.9 μm.

[0036] In the film forming step, the foam-like foam molding material is expandable polymethyl methacrylate resin beads.

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Abstract

The invention relates to a foam pattern surface film forming method for lost foam casting, belonging to a lost foam casting method, and solving the problems that the film forming matter of the current foam pattern surface film forming method has longer film forming time and high cost. The method of the invention comprises the following steps: (1) a film forming matter preparing step: preparing a wax-based organic composite material of which the raw materials in mass percent are as follows: 60%-100% of wax, 0%-40% of stearic acid and 0%-10% of additives, wherein the range of melting point of the wax-based organic composite material is 40 DEG C-70 DEG C, and then heating to meld the composite material to form mixture; and (2) a film forming step: completely soaking the foam pattern into themixture and soaking for 5-60s, and then taking out and slightly shaking or whipping to remove the excess liquid mixture, and after cooling, an even film layer is formed on the foam pattern. The invention has simple operation, short film forming time and lower cost, and can greatly improve the surface quality of the foam pattern, thereby improving the surface qualities of a mold shell and casting,and realizing large-scale industrial production.

Description

Technical field [0001] The invention belongs to a lost foam shell casting method, and in particular relates to a foam pattern surface film forming method for lost foam shell casting, which is used to improve the surface quality of the lost foam shell casting. Background technique [0002] In the 21st century, the development of castings is towards the trend of near-net shape, precision, integration, etc. This requires that castings can be accurately formed at one time with less or no machining, thereby reducing man-hours, reducing costs, and improving production efficiency and benefits. [0003] Lost foam casting is a technology with nearly no margin and precise forming. Foam lost foam has low cost, flexible structure design, and large parts can be produced. It is called "new casting technology in the 21st century". However, the decomposition of the foam pattern of the lost foam casting during the pouring process will cause defects such as pores, wrinkles, inclusions, and carbon in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02
Inventor 樊自田蒋文明廖德锋刘德均赵忠董选普
Owner HUAZHONG UNIV OF SCI & TECH
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