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Gypsum mold precise casting method and device for magnesium alloy casting

A technology of precision casting and gypsum molding, which is applied in the field of gypsum molding precision casting of magnesium alloy castings, can solve the problem of unsolved magnesium alloy flame retardants, etc., and achieve the effects of facilitating shrinkage, reducing shrinkage porosity, and improving mold filling ability.

Pending Publication Date: 2020-03-20
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these two methods, the location of the chilled iron or heat sink will be limited by the shape of the casting, and there are certain limitations in implementation, and the problem of how the magnesium alloy flame retardant enters the gypsum cavity is not solved.

Method used

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  • Gypsum mold precise casting method and device for magnesium alloy casting

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Effect test

Embodiment 1

[0050] A gypsum-type precision casting method for magnesium alloy castings, using the same material casting model and airway model, the airway model and the casting model are connected using a foam ceramic block; the foam ceramic block is a porous foam corundum ceramic block. The foam ceramic block is placed at the position where the molten metal arrives at the end, and plays an exhaust role in the pouring process to prevent the mold from suffocating.

[0051] When making the plaster mold, the casting model and the airway model are placed in advance, and when the casting model and the airway model are melted, the airway will form naturally; both the casting model and the airway model are preferably wax models.

[0052] The magnesium alloy is poured into a mold under a negative pressure of 2KPa (absolute pressure), and after the pouring is completed, it is pressurized and solidified or solidified under atmospheric conditions. When the negative pressure condition is released or ...

Embodiment 2

[0071] A gypsum type precision casting method for magnesium alloy castings, comprising the following steps:

[0072] 1) Using casting simulation technology, design the air channel model for heat dissipation;

[0073] 2) Make casting wax molds, pouring system wax molds and airway wax molds, and cast casting wax molds, pouring system wax molds, foam ceramic blocks 11 soaked in wax, airway wax molds and airway nozzle wax molds Bonding into a wax tree, the wax tree is placed in the cover box 10 of the gypsum mold;

[0074] 3) Add 10% of 100-mesh graphite particles and 2% of boric acid to the casting gypsum powder, and add 25% of water to prepare gypsum slurry;

[0075] 4) Put the casing 10, the assembled wax tree and the bottom plate 12 into the pressure tank, and connect the vent pipe nozzle wax mold to the pressurized air inlet 23 of the pressure tank; vacuumize to make the pressure tank pressure 10 2 -10 3 Pa, the gypsum slurry was stirred under vacuum for 5-20 minutes, and ...

Embodiment 3

[0089] A gypsum type precision casting method for magnesium alloy castings, comprising the following steps:

[0090] 1) Using casting simulation technology, design the air channel model for heat dissipation;

[0091] 2) Make casting wax molds, pouring system wax molds and airway wax molds, and cast casting wax molds, pouring system wax molds, foam ceramic blocks 11 soaked in wax, airway wax molds and airway nozzle wax molds Bonding into a wax tree, the wax tree is placed in the cover box 10 of the gypsum mold;

[0092] 3) Add 6% of 100-mesh graphite particles and 5% of boric acid to casting gypsum powder, and add 30% of water to prepare gypsum slurry;

[0093] 4) Put the casing 10, the assembled wax tree and the bottom plate 12 into the pressure tank, and connect the vent pipe nozzle wax mold to the pressurized air inlet 23 of the pressure tank; vacuumize to make the pressure tank pressure 10 2 -10 3 Pa, the gypsum slurry was stirred under vacuum for 10 minutes, and then th...

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Abstract

The invention discloses a gypsum mold precise casting method and device for a magnesium alloy casting. A casting model and an air duct model which are made of the same material are adopted, and a foamed ceramic block is adopted for connection between the air duct model and the casting model; when a gypsum mold is manufactured, the casting model and the air duct model are placed in advance, and when the casting model is melted, the air duct is naturally formed; and magnesium alloy is poured and cast under the negative pressure condition, and after pouring is completed, pressurization solidification or solidification under the atmospheric condition is conducted. When the negative pressure condition is relieved or pressurization solidification is carried out, air passes through the air duct to cool the casting. The method can be used to change the temperature distribution of the casting mold, improve the cooling speed of the casting, facilitate realization of sequential solidification, and improve the quality of the casting.

Description

technical field [0001] The invention discloses a gypsum-type precision casting method and device for magnesium alloy castings, belonging to the technical field of precision casting methods. Background technique [0002] Large-scale magnesium alloy castings mostly use sand casting, and sulfur powder is mixed in the sand mold, which can play a flame retardant effect, but sand casting is difficult to produce high-precision thin-walled castings. Therefore, researchers have carried out a lot of research work on gypsum magnesium alloy casting , focusing on the flame retardancy of magnesium alloys. The main reason is that magnesium alloys will undergo intense exothermic reactions with gypsum at liquid temperature. Once the reaction starts, it will not stop until the magnesium alloys have completely reacted. The patent "a gypsum formula for casting magnesium alloy and its preparation method" (201110325509.X) uses phosphorus graphite to effectively prevent the oxidation of magnesium ...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22D27/15B22D27/13B22D27/04
CPCB22C9/04B22D27/15B22D27/13B22D27/04
Inventor 毛红奎尹智何炀贾喆徐宏侯击波
Owner ZHONGBEI UNIV
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