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Additive for water soluble core and application method thereof

A technology of water-soluble cores and additives, applied in the direction of cores, molds, mold components, etc., can solve the problems of low core strength, easy corrosion of nozzles, short service life, etc., achieve strong wetting performance and avoid scratches , the effect of increasing strength

Active Publication Date: 2018-09-07
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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  • Additive for water soluble core and application method thereof
  • Additive for water soluble core and application method thereof

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Effect test

Embodiment 1

[0042] A water-soluble core additive 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; water-soluble polymer material One or more of starch, cellulose, polyethylene glycol, epoxy resin, polyacrylamide, etc.; organic acid is one or more of acetic acid, citric acid, oxalic acid, sulfonic acid; water-soluble inorganic The 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 process, and the components such...

Embodiment 2

[0061] The using method of the additive of a kind of water-soluble core of the present embodiment, concrete steps are as follows:

[0062] S100, disposing a spray liquid, dissolving water, polyvinyl alcohol, sodium chloride, sodium carbonate, and oxalic acid in water to prepare an aqueous solution with a viscosity of 3 cps and a pH value of 7.

[0063]S200, droplet injection molding of water-soluble core and intermittent infrared heating pre-curing, lay 100 / 140 mesh silica sand on the lifting table 163, and the liquid spraying device 122 sprays S100 according to the drop path generated by the solid model of the core. For the prepared aqueous solution, after the spraying of the micro-droplets on the layer is completed, the infrared heating plate 180 is turned on to perform intermittent infrared heating and curing on the layer. After curing, the elevating table 163 descends by 0.1 mm to complete the subsequent liquid dripping process and intermittent infrared heating pre-curing ...

Embodiment 3

[0068] The using method of the additive of a kind of water-soluble core of the present embodiment, concrete steps are as follows:

[0069] S100, configure the spray liquid, dissolve water, polyethylene glycol, polyacrylamide, potassium chloride, potassium carbonate, and citric acid in water, and configure it into an aqueous solution with a viscosity of 2 cps and a pH value of 7;

[0070] S200, droplet spray forming of water-soluble core and continuous infrared heating pre-curing, mix 70 / 100 mesh silica sand and 100 / 140 mesh magnesia sand in a ratio of 7:3 and spread them on the lifting workbench 163, 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, and after the spraying of micro-droplets on this layer is completed, the infrared heating plate 180 is turned on to perform infrared heating and pre-curing on the layer. After curing, the elevating table 163 descends by 0.2 mm, and s...

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Abstract

The invention relates to an additive for a water soluble core and an application method thereof, and belongs to the technical field of casting. The additive comprises a water soluble high molecular material, organic acid and water soluble inorganic salt, wherein the water soluble high molecular material is used for improving the initial hardness of a core; the organic acid is used for adjusting the pH value to prevent corrosion; the water soluble inorganic salt is used as an adhesive for the core. The method comprises the following steps: mixing an additive and water to prepare jetting fluid,spraying the jetting fluid layer by layer onto a disperse layer surface of the core; performing heating with infrared ray while spraying is performed, so as to produce a preset core; performing infiltration on the preset core or spraying an inorganic salt solution onto the preset core, laying the infiltrated core into a microwave oven to perform intermittent microwave heating curing after infiltration, and sintering the cured core, so as to further improve the strength of the core.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C9/10B22C1/18B22C23/02B22C9/12B33Y30/00B33Y70/00
CPCB22C1/02B22C1/18B22C9/10B22C9/12B22C23/02B33Y30/00B33Y70/00
Inventor 张龙张明亚谢玲玲王浩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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