Manufacturing method of high-collapsibility mold shell

A collapsible, mold shell technology, applied in the field of investment casting, can solve the problems of extensive casting process, small internal voids, difficult to clean, etc., and achieve the effects of reducing labor intensity, high temperature strength, and residual strength.

Active Publication Date: 2018-09-07
HEBEI GANGYAN DEKAI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the SiO of silica sol 2 The content is high and the casting process is extensive and uncontrolled, the strength of the molded shell is too high, the residual strength after pouring is high, and it is not easy to clean. If the casting has a complex inner cavity or pipeline structure, it will also bring great difficulties to the shell cleaning
At the same time, due to the high density of the mold shell and the small internal gap, the air permeability and heat dissipation of the mold shell are poor, which affects the surface quality of the casting.

Method used

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  • Manufacturing method of high-collapsibility mold shell
  • Manufacturing method of high-collapsibility mold shell
  • Manufacturing method of high-collapsibility mold shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 A kind of preparation method of high collapsibility formwork X1

[0043] Prepare the surface layer by mixing 25% silica sol with zircon powder to prepare the coating slurry. Use a flow cup to strictly control the viscosity of the slurry. The viscosity is 28s. Within the specified range; dip the module into the paint and move it up and down and turn it, then lift it up. If there is paint accumulation, brush it evenly with a brush, and rotate the module reasonably to cover the module with a layer of paint evenly. Sanding can be carried out when the paint drips very little. The control of the paint dripping time can prevent the paint from sticking to the sand due to natural hardening. Because the module has small diameter deep holes or angles, grooves and other coatings are not easy to immerse, so before coating, dip the paint with a brush and drop it into the hole grooves to puncture the air bubbles in the hole grooves, so that the surface of the module is ...

Embodiment 2

[0048] Embodiment 2 A kind of preparation method of high collapsibility formwork X2

[0049] Surface layer preparation, the coating slurry is prepared by mixing silica sol with a silica content of 25% and zircon powder, using a flow cup to strictly control the viscosity of the slurry, the viscosity is 30s, stir evenly before coating the slurry, and retest the viscosity , to ensure that the viscosity is within the specified range; immerse the module in the paint, move and rotate up and down, and then lift it up. If there is paint accumulation, brush it evenly with a brush, and rotate the module reasonably to cover the module with a layer of paint evenly. Sanding can be carried out when the paint drips very little. The control of the paint dripping time can prevent the paint from sticking to the sand due to natural hardening. Because the module has small diameter deep holes or angles, grooves and other coatings are not easy to immerse, so before coating, dip the paint with a b...

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Abstract

The invention relates to a manufacturing method of a high-collapsibility mold shell. The manufacturing method comprises the following steps that surface layer slurry with first specific viscosity is prepared; white corundum sand is scattered, and a surface layer is formed on the surface of a mold set; a transition layer slurry with second specific viscosity is prepared; mullite sand and graphite particles are fully mixed uniformly and manufactured into mixed sand; sequentially, the transition layer slurry coats the surface of the surface layer, and the mixed sand is scattered on the surface ofthe surface layer, so that a transition layer is formed; reinforcing layer slurry with third specific viscosity is prepared; a reinforcing layer is formed on the surface of the transition layer; slurry sealing is carried out on the mold set, and a mold shell is formed; and the mold shell is subjected to dewaxing, roasting and cooling to be manufactured into the high-collapsibility mold shell. According to the manufacturing method of the high-collapsibility mold shell, the mold shell is easy to dry, the manufacturing efficiency is high, remnant of the mold shell is small, strength is low, themold shell is easy to clear, the mold shell has good breathability, and the defects of air hole and pinhole looseness and the like on the surface of a casting can be reduced.

Description

technical field [0001] The invention relates to the field of investment casting, in particular to a method for preparing a highly collapsible mold shell. Background technique [0002] Investment casting is to prepare models by pressing wax patterns or other meltable materials, and prepare modules in a certain combination method, coat refractory materials on the surface of the modules and sprinkle sand on the surface of the modules to form a mold shell of a certain thickness, and dry it naturally . Use high-pressure water steam or direct high-temperature roasting to melt the loss module, and the remaining formwork is roasted at high temperature to ceramicize the refractory material, and finally a certain strength formwork is obtained, and molten metal is injected into the formwork to obtain metal castings. After pouring, wait for the casting to cool, and use the method of hydraulic sand cleaning to remove the residual formwork. The gating system is cut off and the nozzle is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/00B22C3/00
CPCB22C1/00B22C3/00B22C9/04
Inventor 郝圆亮邵冲高仕山朱小平毕亮孟小东
Owner HEBEI GANGYAN DEKAI TECH CO LTD
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