A kind of preparation method of the additive of water-soluble core

A water-soluble core and additive technology, used in cores, casting equipment, metal processing equipment, etc., can solve the problems of low core strength, short service life, easy corrosion of nozzles, etc., to achieve strong wetting performance and improve strength. , the effect of increasing strength

Inactive Publication Date: 2020-01-07
宣城市益超金属箔材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 preparation method of the additive of water-soluble core
  • A kind of preparation method of the additive of water-soluble core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]A method for preparing an additive for a water-soluble core in this embodiment, the additive includes the following components: 10%-20wt% of water-soluble polymer material, 0-5wt% of organic acid, 75-90wt% of water-soluble inorganic salt; The polymer material is one or more of starch, cellulose, polyethylene glycol, epoxy resin, polyacrylamide, etc.; the organic acid is one or more of acetic acid, citric acid, oxalic acid, and sulfonic acid; The water-soluble inorganic salt is one or more of chloride, bromide, carbonate, sulfate, phosphate, nitrate, metaaluminate and hydroxide. The water-soluble polymer material plays the role of ensuring the low-temperature bonding strength, the water-soluble inorganic salt is the main binder, which ensures the core strength at medium and high temperatures, and the organic acid plays the role of adjusting the pH value. Since the additive and water are mixed into a solution, the water gradually evaporates during the subsequent heating pr...

Embodiment 2

[0066] A kind of high-strength water-soluble core of the present embodiment, the production process is as follows:

[0067] S100, micro-droplet injection molding, lay 100 / 140 mesh silica sand on the lifting table 163, the liquid spraying device 122 sprays additives according to the droplet path generated by the solid model of the core, after the micro-droplet spraying on this level is completed, the lifting work The stage 163 goes down by 0.1mm, and completes the subsequent dripping processes on discrete levels in sequence until the dripping processes on all discrete levels are completed;

[0068] S200, intermittent microwave curing, take out the injection-molded core together with the powder bed 164, place it in the microwave oven 210 for intermittent microwave heating, and take it out after the core is completely cured;

[0069] S300, spraying inorganic salt solution, taking out the mold core after microwave curing, spraying Na + / / Cl - , CO 3 2- -H 2 For the solution o...

Embodiment 3

[0074] A kind of high-strength water-soluble core of the present embodiment, the production process is as follows:

[0075] S100, micro-droplet injection molding, mix 70 / 100 mesh silica sand and 100 / 140 mesh magnesia sand evenly in a ratio of 7:3 and spread them on the lifting workbench 163, and the liquid spraying device 122 generates according to the solid model of the core Additives are sprayed on the dripping path. After the spraying of micro-droplets on this level is completed, the lifting table 163 moves down by 0.2mm, and the subsequent dripping processes on discrete levels are completed in sequence until the dripping processes on all discrete levels are completed;

[0076] S200, intermittent microwave curing, take out the injection-molded core together with the powder bed 164, place it in the microwave oven 210 for intermittent microwave heating, and take it out after the core is completely cured;

[0077] S300, infiltrate the inorganic salt solution, take out the mold c...

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Abstract

The invention discloses a method for preparing a water-soluble mold core additive and belongs to the technical field of casting. The method comprises the following steps: respectively dissolving a water-soluble high polymer material and a water-soluble inorganic salt into water, mixing, testing the pH value, dropping an organic acid by using a burette, and adjusting the pH value of the mixed solution to 7, thereby obtaining the additive. Due to adoption of the organic high polymer material in the additive prepared by using the method, a water-soluble mold core has relatively high primary strength; the pH value is adjusted by using the organic acid, so that the problem that a micro-drip ejection head is short in service life is solved; as the water-soluble inorganic slat is used as an adhesive of the mold core, the strength can be improved.

Description

technical field [0001] The invention belongs to the technical field of casting, and specifically relates to a method for preparing an additive for a water-soluble mold core. 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. Problems such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/02B22C9/10
CPCB22C1/02B22C9/105
Inventor 黄贞益杨晓娜王萍李景辉张龙吕璇
Owner 宣城市益超金属箔材科技有限公司
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