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A kind of rapid prototyping method of microwave curing water-soluble core

A technology of microwave solidification and water-soluble cores, which is applied in the direction of cores, mold components, molds, etc., can solve problems such as short service life, low core strength, and easy corrosion of nozzles, so as to ensure strength, improve strength, and avoid scratched effect

Active Publication Date: 2020-02-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the traditional forming method of the existing water-soluble core has a long preparation period, the production cost of individualized products is relatively high, and the existing micro-droplet spray forming water-soluble core uses inorganic salt solution as the spray liquid, and the nozzle is easy to corrode. Problems with shorter service life and lower core strength

Method used

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  • A kind of rapid prototyping method of microwave curing water-soluble core
  • A kind of rapid prototyping method of microwave curing water-soluble core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of rapid prototyping method of microwave curing water-soluble core of the present embodiment, comprises the following steps:

[0044] S100, configure the spray liquid, mix water and additives evenly, and prepare an aqueous solution with a viscosity of 1-10 cps and a pH value of 7;

[0045] S200, micro-droplet injection molding, lay the molding sand on the lifting table 163, and the liquid spraying device 122 sprays the aqueous solution configured in S100 according to the droplet path generated by the solid model of the core. The platform 163 goes down by 0.01-1 mm, and completes the subsequent liquid dripping process on the discrete layers in sequence until the liquid dripping processes on all the discrete layers are completed;

[0046] S300, intermittent microwave curing, taking out the injection-molded core together with the powder bed 164, placing it in the microwave oven 210 for intermittent microwave heating, and taking out the core after it is completely cu...

Embodiment 2

[0062] The rapid prototyping method of a kind of microwave curing water-soluble core of this implementation, its operation process is as follows:

[0063] S100, configure the spray liquid, dissolve polyethylene glycol, starch, potassium chloride, potassium hydroxide, and oxalic acid in water, and configure it into a solution with a viscosity of 3-5cps and a pH value of 7;

[0064] S200, micro-droplet injection forming, laying 100 / 140 mesh mullite sand on the lifting worktable 163, the head of the liquid spraying device 122 sprays the aqueous solution configured in S100 according to the drop path generated by the solid model of the core, and waits for the layer After the spraying of micro-droplets is completed, the lifting table 163 moves down by 0.05 mm, and the subsequent dripping processes on discrete levels are completed in sequence until the dripping processes on all discrete levels are completed;

[0065] S300. Intermittent microwave curing, take out the spray-molded core...

Embodiment 3

[0069] The rapid prototyping method of a kind of microwave curing water-soluble core of this implementation, its operation process is as follows:

[0070] S100, configure the spray liquid, dissolve polyacrylamide, polyethylene glycol, potassium carbonate, and potassium chloride citric acid in water, and configure it into a solution with a viscosity of 3-5 cps and a pH value of 7;

[0071]S200, micro-droplet injection molding of water-soluble core, mix 70 / 100 mesh silica sand and 100 / 140 mesh mullite sand evenly and spread them on the lifting worktable 163, the liquid spray device 122 generates the droplets according to the solid model of the core The liquid path sprays the aqueous solution configured in S100, and after the spraying of micro-droplets on this level is completed, the lifting table 163 moves down by 0.03 mm, and the subsequent dripping processes on discrete levels are completed in sequence until the dripping processes on all discrete levels are completed;

[0072]...

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Abstract

The invention discloses a method for rapidly forming a microwave curing water-soluble core and belongs to the technical field of casting. The method disclosed by the invention comprises the followingsteps: S100, preparing a spraying solution; S200, performing droplet jetting forming; S300, performing intermittent microwave curing; S400, wetting or spraying an inorganic solution; S500, performingsecondary intermittent microwave curing; and S600, sintering. According to the method disclosed by the invention, the core is subjected to microwave hardening pre-forming and then subjected to inorganic salt solution impregnation, secondary microwave curing and sintering; and since the wetting property of the inorganic salt solution is extremely high, pores filled with the pre-formed core can be fully wetted, the inorganic salt is separated out by crystallization in the secondary intermittent microwave curing process, and the strength of the core is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of casting, and specifically relates to a rapid prototyping method for microwave solidified water-soluble mold cores. Background technique [0002] There are a large number of aluminum alloy castings with complex inner cavities and curved channels in the fields of automobiles, construction machinery and aerospace. These complex aluminum alloy castings can be produced with built-in metal cores, resin sand cores and water soluble cores. Due to the complex process of metal core core making, and the use of chemical core removal is easy to cause environmental pollution, this has prompted organic resin sand cores with excellent comprehensive performance to be widely used in the production of such castings. However, with the development of technology, the forming temperature of aluminum alloy castings is lowered, and the collapse performance of the organic resin sand cores that are easy to collapse is weakened. P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10B22C1/02
CPCB22C1/02B22C9/105
Inventor 张龙谢玲玲章小峰杨晓娜彭磊
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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