Gypsum-mold vacuum pouring pressurized solidification casting method and device

A technology of vacuum casting and gypsum molding, which is applied to casting molding equipment, casting molds, cores, etc., which can solve the problems of shape and position restrictions, slow cooling of gypsum molding, and poor cooling effect, so as to improve the yield of finished products and facilitate replenishment Shrink effect

Pending Publication Date: 2020-02-21
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of slow cooling of the plaster mold, the methods that have been developed mainly include: pre-embedding metal heat sinks in the plaster mold, such as using chilled iron castings, the rapid cooling process is limited by the shape and position of the metal heat sink, and the cooling effect is not good
[0004] In the magnesium alloy gypsum mold casting, the patent application with the publication number CN104209497A: a large complex thin-walled magnesium alloy piece gypsum mold casting method also adopts the method of placing amorphous cold iron at the hot joint to improve the cooling speed of the mold, and the shape is not fixed. The mixture components of cold iron are phenol resin, toluenesulfonic acid, boric acid, bentonite, chromite sand in mass percentage, and then the tank is filled with SF 6 dry air or CO 2 atmosphere, implement vacuum casting and pressurized solidification. On the one hand, this method is limited by the shape and position of the cold iron, and on the other hand, it needs to configure the mixture components, which is inconvenient and easy to cause poor exhaust. Stomata

Method used

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  • Gypsum-mold vacuum pouring pressurized solidification casting method and device
  • Gypsum-mold vacuum pouring pressurized solidification casting method and device

Examples

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Effect test

Embodiment 1

[0039] A gypsum type vacuum pouring pressurized solidification casting method, specifically comprising the following steps:

[0040] 1) Make casting wax molds, gating system wax molds, and airway wax molds according to the shape and size of the casting; control the final cooling rate by setting the distance between the airway and the casting wax mold and the size of the cross-sectional area.

[0041]2) Set the sprue and air vent 12 on the casing 16, assemble the casting wax mold and the airway wax mold, and use the second connecting block 18 to fix the casting wax mold and the airway wax mold, and the casting wax mold One side is bonded to the sprue port of the sleeve box 16 through the wax mold of the gating system; the end of the airway wax mold is bonded to the vent 12 of the sleeve box 16, and the side wall of the airway wax mold and the sleeve box 16 adopts the first connection Block 17 bonding;

[0042] The pouring port is arranged on the top of the casing, and the vent...

example 2

[0055] (1) According to the shape and size of the casting to be cast, make casting wax molds, pouring system wax molds, and airway wax molds, and place them in the casing. The location is installed correctly;

[0056] (2) Put the casing 16, the airway wax mold and the casting wax mold into the vacuum tank, and pour the gypsum slurry;

[0057] (3) After the poured gypsum mold is placed for 12 hours to be finalized, it is placed in a roasting furnace for dewaxing and roasting. The roasting process is as follows: figure 2 shown;

[0058] (4) After roasting, when the gypsum mold is cooled to 200-300°C, push the gypsum mold into the pressure tank, align the air passage in the gypsum mold with the pressurized air inlet, and fix the casing 16 to the bottom plate 10;

[0059] (5) Fill the ladle 4 with molten metal and hang it at the pouring position;

[0060] (6) Close the pressure tank door 11 and lock it;

[0061] (7) Open the valve 8 of the vacuum tank to reduce the pressure i...

example 3

[0065] (1) Bond the airway wax mold to the casting wax mold, and use cold iron and heat-resistant ceramic blocks at the joint to prevent the air from entering the mold cavity when the air is pressurized, and then the casting wax mold, the casting system wax mold, etc. Put the wax model in the casing, and ensure that the position of the vent is installed correctly;

[0066] (2) Put the casing 16, the airway wax mold and the casting wax mold into the vacuum tank, and pour the gypsum slurry;

[0067] (3) After the cast gypsum mold is placed for 24 hours, it is put into a roasting furnace for dewaxing and roasting, and the roasting process is selected according to the gypsum mold casting process manual;

[0068] (4) When the temperature of the gypsum mold after roasting is 200-300°C, push the gypsum mold into the vacuum tank, align the air channel in the gypsum mold with the pressurized air inlet, and fix the casing 16 and the bottom plate 10;

[0069] (5) Fill the ladle 4 with m...

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PUM

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Abstract

The invention discloses a gypsum-mold vacuum pouring pressurized solidification casting method and device. A casting wax mold, a casting system wax mold and a ventilation passage wax mold are manufactured according to the shape size of a to-be-cast part, the ventilation passage wax mold is pre-placed in a gypsum mold, and after the wax mold is removed, a ventilation passage is formed, pressurizedgas is flowed through the ventilation passage, and then the effect of casting mold cooling is achieved; and depending on the arrangement of the ventilation passage, the temperature distribution of thecasting is changed, so that the solidification sequence of the casting is adjusted, the casting tends to solidify in sequence, and the yield of the casting is favorably improved.

Description

technical field [0001] The invention discloses a gypsum type vacuum pouring pressurized solidification casting method and device, belonging to the technical field of casting methods. Background technique [0002] Gypsum mold precision casting is a new technology of precision casting developed in the 1970s. It assembles the investment mold and fixes it on the sand box plate specially used for grouting, pours the gypsum slurry in under vacuum, and after the slurry is condensed, it can be removed by drying, and then dried, Roasting becomes a gypsum type, and casting is obtained by casting under vacuum. The advantage of plaster casting is that it is excellent in remodeling, accurate and smooth, and can be applied to large and complex castings. The disadvantage is that the thermal conductivity of the gypsum mold is very low, and the cooling effect of the mold is poor. When the wall thickness of the casting varies greatly, defects such as shrinkage porosity and shrinkage cavity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D27/04B22D27/15
CPCB22C9/04B22D27/04B22D27/15
Inventor 毛红奎尹智贾喆何炀徐宏侯击波
Owner ZHONGBEI UNIV
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