Soluble mold core and preparation method thereof

A core, polyethylene glycol technology, applied in the direction of cores, casting equipment, casting molds, etc., can solve the problems of soluble cores that are not suitable for high-quality castings, low strength, and pollute the environment.

Inactive Publication Date: 2009-10-21
江苏嘉宸合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Urea has poor thermal stability, low dimensional accuracy of the formed inner cavity, poor surface quality, low strength, high brittleness, and releases ammonia gas, which not only pollutes the environment, corrodes the mold, but is also harmful to the human body; The core is easy to absorb moisture, the surface quality is low, the dimensional accuracy is not high, and the comprehensive performance of strength and toughness is poor
These two types of soluble cores are not suitable for producing high-quality castings, so it is necessary to develop new soluble cores to meet the requirements of manufacturing high-quality castings

Method used

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  • Soluble mold core and preparation method thereof
  • Soluble mold core and preparation method thereof
  • Soluble mold core and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The binder selection molecular weight is the polyethylene glycol of 3000 and 8000, and the mass ratio of the two is 50:50, stir evenly, dissolve and stir by water bath; The filler that adopts is made up of two parts, sodium bicarbonate and talcum powder ( Add 5% aluminum oxide powder), the mass ratio between the two is 60:40, the two are mixed evenly; the mass ratio of the binder to the filler is 60:40, and the filler is evenly added to the melted binder , after stirring evenly, add plasticizer, plasticizer adopts polyethylene, and polyethylene can be dissolved in paraffin, the mass ratio of paraffin and polyethylene is 10:90, and plasticizer accounts for 2% of the total mass of binding agent and filler ; After the core material is fully mixed and heated to 110°C, the soluble core is prepared by injection molding; the prepared soluble core is put into the wax mold, and the wax mold is prepared by injection molding. The mold injection temperature is 55°C-68°C. Put the pr...

Embodiment 2

[0021] The binding agent selection molecular weight is the polyethylene glycol of 2000 and 5000, and the mass ratio of the two is 60: 40, stir evenly, dissolve and stir by water bath; The filler that adopts is made up of two parts, sodium carbonate and talcum powder (adding 10% Al2O3 powder), the mass ratio between the two is 60:40, the two are mixed evenly; the mass ratio of the binder to the filler is 60:40, the filler is evenly added to the melted binder, After stirring evenly, add plasticizer, plasticizer adopts polyethylene, and polyethylene can be dissolved in paraffin, the mass ratio of paraffin and polyethylene is 20: 80, and plasticizer accounts for 3% of the gross mass of binding agent and filler; After the core material is fully mixed and heated to 115°C, the soluble core is prepared by injection molding; the prepared soluble core is put into the wax mold, and the wax mold is prepared by injection molding. The injection temperature is 55°C-65°C. Put the pressed wax ...

Embodiment 3

[0023] The binder selection molecular weight is the polyethylene glycol of 2000 and 5000, and the mass ratio of the two is 60:40, stir well, melt and stir by water bath; The filler that adopts is made up of two parts, sodium carbonate and mica powder (adding 5% Al2O3 powder), the mass ratio between the two is 60:40, the two are mixed evenly; the mass ratio of the binder to the filler is 60:40, the filler is evenly added to the melted binder, After stirring evenly, add plasticizer, plasticizer adopts polyethylene, and polyethylene can be dissolved in paraffin, the mass ratio of paraffin and polyethylene is 15: 85, and plasticizer accounts for 3% of the gross mass of binding agent and filler; After the core material is fully mixed and heated to 110°C, the soluble core is prepared by injection molding; the prepared soluble core is put into the wax mold, and the wax mold is prepared by injection molding. The injection temperature is 55°C-70°C. Put the pressed wax mold into the aqu...

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Abstract

The invention provides a soluble mold core and a preparation method thereof. The soluble mold core comprises the main ingredients, such as polyethylene glycol binder, filling and plasticizer, wherein the mass ratio of the polyethylene glycol binder to the filling is 60:40 to 40:60, the mass ratio of paraffin to polyethylene in the plasticizer is 20:80 to 5:95, and the plasticizer is 1 to 5 percent of the total mass of the polyethylene glycol binder and the filling. The soluble mold core has a certain strength and toughness, can ensure the smooth molding of a paraffin mold, can be easier to lose in an aqueous medium under the condition of undamaging the performance and the shape of the paraffin mold and can satisfy the requirements for manufacturing high-quality castings.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a soluble core for investment precision casting and a preparation method thereof. Background technique [0002] With the development of modern industry, the requirements for precision casting parts are getting higher and higher, and the shapes of parts are becoming more and more complex, especially the complex inner cavity structure brings great difficulty to investment precision casting. When preparing parts, complex inner cavities can be formed by cores. If ceramic cores are used to form inner cavity structures, the cost is high and time-consuming, especially after the casting is formed, it is difficult to remove the ceramic cores. The chemical substances in the ceramic core are also harmful to the casting itself; while the soluble core is used to form the cavity structure of the wax mold of the casting, the cavity of the wax mold can be formed without the soluble c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C1/20B22C9/10
Inventor 毛萍莉姜卫国胡壮麒刘正
Owner 江苏嘉宸合金科技有限公司
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