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Gypsum mold for aluminum alloy casting

A technology of aluminum alloy castings and plaster molds, which is applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of degassing and impurity removal conditions, etc., to increase peelability, improve efficiency, and increase adhesion Effect

Active Publication Date: 2018-09-04
ZHEJIANG GAOAO SANITARY WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Low-pressure casting follows the general casting process. First, the aluminum alloy solution must be refined and removed. In the prior art, the removal of aluminum alloy can be carried out not only in the melting furnace, but also in the holding furnace or crucible of the low-pressure casting machine. It is different from the ordinary gravity casting method in which filters can be placed at multiple positions in the ladle, hopper, and runner to repeatedly degas and remove impurities from the aluminum alloy liquid. Or melting in a crucible and directly entering the mold cavity through the riser pipe, the conditions for degassing and impurity removal are subject to many restrictions

Method used

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  • Gypsum mold for aluminum alloy casting
  • Gypsum mold for aluminum alloy casting

Examples

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Effect test

Embodiment 1

[0026] see figure 1 , figure 1 It is a schematic structural diagram of a plaster mold for aluminum alloy casting according to the present invention. The plaster mold includes a mold shell composed of an upper mold shell 1 and a lower mold shell 2, and a mold cavity enclosed by the mold shells for forming aluminum alloy castings.

[0027] see figure 2 , figure 2 Yes figure 1 A partial enlarged view at the middle circle, it can be seen from the figure that the inner wall of the cavity is at least partially provided with the adhesion layer 3 .

[0028] The material of the adhesion layer is mainly composed of molten salt substances that can degas the aluminum alloy liquid and exclude metal inclusions, and its combination can also consider the adhesion to the inner wall of the plaster mold cavity and the peelability of the casting (this adhesion and Peelability needs to be controlled with coating thickness).

[0029] According to the above principles, the above-mentioned ad...

Embodiment 2

[0034] This embodiment is a description of the specific composition of the material of the adhesion layer in the plaster mold for aluminum alloy casting proposed in Example 1. Specifically, the adhesion layer is composed of the following materials in parts by weight:

[0035] NaCl+KCl: 15-25 parts by weight; NaF: 8-12 parts by weight; CaF2: 5-8 parts by weight; K3AlF6: 5-8 parts by weight; Na2SO4+K2SO4: 3-5 parts by weight; Graphite: 1-3 parts by weight parts; CaCO3: 4-6 parts by weight.

[0036] Wherein, in the 15-25 parts by weight of NaCl+KCl, the weight ratio of NaCl and KCl is 1:0.5-2.

[0037] Wherein, in the 3-5 parts by weight of Na2SO4+K2SO4, the weight ratio of Na2SO4 and K2SO4 is 1:0.5-2.

[0038] The above materials are mixed and hot-melted and then dip-coated on the inner wall of the mold cavity.

Embodiment 3

[0040] This embodiment is a further optimization of the material of the adhesion layer proposed in Example 2. Specifically, the adhesion layer is composed of the following materials in parts by weight:

[0041] NaCl: 12 parts by weight; KCl: 10 parts by weight; NaF: 9 parts by weight; CaF2: 6 parts by weight; K3AlF6: 6 parts by weight; Na2SO4: 1.5 parts by weight; K2SO4: 2 parts by weight; Graphite: 2 parts by weight; CaCO3: 4.5 parts by weight.

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Abstract

The invention discloses a gypsum mold for aluminum alloy casting, and the gypsum mold is applicable to low-pressure casting. The gypsum mold comprises a mold shell and a mold cavity formed by the moldshell and used for the forming of an aluminum alloy casting, an adhesion layer is arranged on the inner wall of the mold cavity, and the adhesion layer material comprises NaCl, KCl, NaF, CaF2, K3AlF6, Na2SO4, K2SO4, graphite and CaCo3; the thickness of the adhesion layer can be 0.5-5 mm; and the mold cavity is preferably provided with a dead head structure positioned at the top or a process machining allowance corresponding to the product.

Description

technical field [0001] The application relates to the technical field of casting, in particular to a plaster mold for aluminum alloy casting. Background technique [0002] In the field of casting, aluminum alloy castings are a kind of castings with large output and wide application due to their high strength and light weight. Generally speaking, various casting methods such as metal mold casting, high pressure casting, Low pressure casting, investment casting, lost foam casting, etc. are all suitable for the manufacture of aluminum alloy parts. Among them, low-pressure casting is a technologically advanced casting method. The castings produced have high density and good strength. The pouring principle of low-pressure casting is that the model is placed above the crucible, and the aluminum alloy liquid passes through the riser and runner under a certain pressure. , rise into the mold cavity, and keep the pressure for a period of time after filling the mold cavity, so that th...

Claims

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Application Information

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IPC IPC(8): B22C9/02B22C3/00
Inventor 孟繁华
Owner ZHEJIANG GAOAO SANITARY WARE CO LTD
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