Method for increasing permeability of investment cast ceramic shell

A technology of investment casting and ceramic molding, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems that the gas cannot be discharged from the mold shell, the gas cannot be discharged from the mold shell, and the castings are scrapped, etc., so as to improve the quality of casting Pass rate, guaranteed surface quality, simple effect of mixing process

Active Publication Date: 2015-03-11
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] More and more complex structural parts and thin-walled parts with a wall thickness of less than 1mm need to be molded by casting. The shell is composed of powder and sand closely connected with almost no gaps. If the shell is damp during pouring, or If the gas content in the alloy is too high, the gas in the shell cannot be discharged, and defects such as pores or cold shuts will be formed on the surface of the casting, causing the casting to be scrapped
[0003] Therefore, it is necessary to solve the problem that the gas cannot be discharged from the shell during the pouring process through technical improvement

Method used

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  • Method for increasing permeability of investment cast ceramic shell
  • Method for increasing permeability of investment cast ceramic shell
  • Method for increasing permeability of investment cast ceramic shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Make 10 pieces of a small thin-walled structural part, the outer dimension is about 60mm×100mm×250mm.

[0024] Weigh the refractory material powder 320# bauxite powder and GRJ26 silica sol of each layer of the reinforcement layer according to the ratio of 4-4.5:1 by mass, and add the polyester fiber into the mixing tank for mixing, and the stirring speed is 400-500r / min , stirred for 24 hours, then added the defoamer n-butanol accounting for 0.5-1wt% of the mass of silica sol in each layer and the wetting agent stearic acid accounting for 0.5-1wt% of the mass of silica sol in each layer, and adjusted the viscosity of the coating to The range required for each layer of coating in the reinforcement layer is to obtain the reinforcement layer coating with polyester fibers added to each layer, and the final sealing layer coating does not add polyester fibers; wherein, the quality of polyester fibers added is 0.5 to 0.7wt of the powder quality of each layer of the reinforcemen...

Embodiment 2

[0036] Make 10 pieces of certain blade parts, the outer dimension is about 150mm×50mm×20mm.

[0037] Weigh the refractory material powder of each layer of the reinforcement layer 320# fused mullite powder and GRJ26 silica sol according to the mass ratio of 3.5-4:1, pour part of the silica sol into the mixing bucket, and put the weighed Pour the powder of each layer into the mixing bucket 3 to 4 times, stir with a mixer while pouring, the stirring speed is 400-500r / min, mix the aramid fiber into the last batch of powder and add it to the mixing bucket, then add the remaining The silica sol was mixed and stirred for 27 hours, and finally, the defoamer n-butanol accounting for 0.5-1 wt% of the mass of each layer of silica sol and the wetting agent stearic acid accounting for 0.5-1 wt% of the mass of each layer of silica sol were added, and the viscosity of the coating was adjusted with deionized water. Adjust to the range required by the coatings of each layer of the reinforcemen...

Embodiment 3

[0041] Make 4 pieces of a large circular part, the outer dimension is about

[0042]Weigh the 320# fused corundum powder and GRJ26 silica sol in the ratio of 3.5-4.5:1 for the refractory material powder of each layer of the reinforcement layer, pour part of the silica sol into the mixing bucket, and divide the weighed powder into Pour into the mixing bucket for 3 to 4 times, stir with a mixer while pouring, the stirring speed is 400-500r / min, mix the aramid fiber into the last batch of powder and add it to the mixing bucket, then add the remaining silica sol and mix for 30 hours , finally add the defoamer n-butanol accounting for 0.5-1wt% of the mass of silica sol in each layer and the wetting agent stearic acid accounting for 0.5-1wt% of the mass of silica sol in each layer, and use deionized water to adjust the viscosity of the coating to the level of each reinforcement layer. The range required for the layer coating is obtained by adding the reinforcement layer coating of...

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Abstract

The invention provides a method for increasing the permeability of an investment cast ceramic shell, and belongs to the field of investment casting. The problem of easy formation of defects of the surface of a cast member in the cast member casting process in the prior art is solved. The method comprises the following steps: adding an adhesive, strengthening layer all-layer powder and carbon-containing fibers into a stirring barrel, adding an antifoaming agent and a wetting agent, and adjusting the viscosity of the obtained coating to a required range by using deionized water to obtain a strengthening layer coating with all layers having the carbon-containing fibers; coating a wax mold with the surface layer coating of the shell according to a routine shell making technology, completing a coating, sanding and drying process by using the all-layer strengthening layer coating, coating a sealing slurry layer without the carbon-containing fibers, and drying to obtain a shell; and dewaxing the shell, and roasting to obtain the net structured ceramic shell with exhaust channels. The method guarantees the strength of the shell, improves the permeability of the shell, eliminates the defects caused by unsmooth exhaust of the surface of the cast member, guarantees the quality of the surface of the cast member, and improves the qualified rate of the cast member.

Description

technical field [0001] The invention belongs to the field of investment casting, and mainly relates to a method for increasing the air permeability of an investment casting ceramic shell. Background technique [0002] More and more complex structural parts and thin-walled parts with a wall thickness of less than 1mm need to be molded by casting. The shell is composed of powder and sand closely connected with almost no gaps. If the shell is damp during pouring, or If the gas content in the alloy is too high, the gas in the shell cannot be discharged, and defects such as pores or cold shuts will be formed on the surface of the casting, causing the casting to be scrapped. [0003] Therefore, it is necessary to solve the problem that the gas cannot be discharged from the shell during the pouring process through technical improvement. Contents of the invention [0004] The object of the present invention is to solve the above-mentioned problems in the prior art and provide a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C3/00B22C1/02
CPCB22C1/02B22C3/00B22C9/043
Inventor 杜洪强张泽海邹建波张玲张明俊
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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