Plaster mold for aluminum alloy casting

A technology for aluminum alloy castings and plaster molds, which is used in casting molding equipment, casting molds, and casting mold components. Effect

Inactive Publication Date: 2019-08-30
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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  • Plaster mold for aluminum alloy casting
  • Plaster mold for aluminum alloy casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , figure 1 It is a structural schematic diagram of a plaster mold for aluminum alloy casting of 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 for forming aluminum alloy castings surrounded by the mold shells.

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

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

[0029] According to the above principles, choose the appropriate ratio of NaCl, ...

Embodiment 2

[0034] This example is an illustration 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; CaF 2 : 5-8 parts by weight; K 3 AlF 6 : 5-8 parts by weight; Na 2 SO 4 +K 2 SO 4 : 3-5 parts by weight; Graphite: 1-3 parts by weight; CaCO 3 : 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, the Na of described 3-5 weight part 2 SO 4 +K 2 SO 4 In, Na 2 SO 4 and K 2 SO 4 The weight ratio is 1:0.5-2.

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

Embodiment 3

[0040] This embodiment is a further optimization of the adhesion layer material 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; CaF 2 : 6 parts by weight; K 3 AlF 6 : 6 parts by weight; Na 2 SO 4 : 1.5 parts by weight; K 2 SO 4 : 2 parts by weight; Graphite: 2 parts by weight; CaCO 3 : 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 present application relates to the field of casting technology, 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 casting with large output and wide application due to their high strength and light weight. Generally speaking, various casting methods such as sand casting and metal casting in special 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 casting method with advanced technology. 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. , rises into the mold cavity, fills the mold cavity and keeps the pressure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B22C3/00
Inventor 孟繁华
Owner ZHEJIANG GAOAO SANITARY WARE CO LTD
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