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Method for preparing overall shell mold by utilizing vaporizing combustion of mold shell roasting pattern

A shape and roasting technology, which is applied in the field of preparing the overall shell shape by gasification and combustion of the mold shell roasting pattern, can solve the problems of subcutaneous air holes, pungent smell castings, etc., to avoid carbon increase, solve pungent smell, and reduce dewaxing process Effect

Active Publication Date: 2014-09-03
沃尔曼科技张家港有限公司
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Problems solved by technology

[0004] The invention provides a method for preparing an integral shell mold by gasification and combustion of the mold shell roasting pattern, which reduces the investment casting dewaxing process, shortens the production cycle, and improves production efficiency; the shell mold manufacturing does not use phenolic resin as a binder, and solves the problem of Eliminate the irritating smell and pores under the casting skin during shell casting; the gasification mold shell is roasted, gasified, burned, and disappeared before pouring, avoiding defects such as carburization of steel castings and wrinkled iron castings in lost foam casting. Improve casting quality

Method used

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  • Method for preparing overall shell mold by utilizing vaporizing combustion of mold shell roasting pattern

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Embodiment 1

[0018] Such as figure 1 As shown, the method of preparing the overall shell shape by gasification and combustion of the high-temperature roasting pattern of the mold shell is used to trial-produce the nickel-based alloy impeller, including the following steps:

[0019] Step 1: Use polyethylene (PE) plastic as the pattern material, design and manufacture pattern forming molds, and use injection molding to make patterns such as sprue cups, runners and castings.

[0020] Step 2. According to the design requirements of the casting process, the three impeller shapes are arranged at 120° on the same horizontal plane, and the sprue cup, sprue, and castings are bonded and assembled into an overall shape and trimmed according to technical requirements.

[0021] Step 3, dip-coat the surface layer slurry, shake the slurry, sprinkle surface sand, and dry for 20 to 28 hours to make the surface layer; after the surface layer is dried, dip-coat the back layer slurry and sprinkle sand , Dry ...

Embodiment 2

[0026] In this embodiment, the traditional investment casting method is used to produce the nickel-based alloy impeller, including the following steps:

[0027] Step 1. Design and manufacture the mold, use B576 / medium temperature wax to make wax molds such as sprue cups, runners and castings.

[0028] Step 2. According to the design requirements of the casting process, the three impeller wax molds are arranged at 120° on the same horizontal plane, and the sprue cup, sprue and castings are bonded and assembled to form an overall wax mold group and carried out according to the technical requirements. Trimming.

[0029] Step 3, dip-coat the surface layer slurry, shake the slurry, sprinkle surface sand, and dry for 20 to 28 hours in sequence to make the surface layer; after the surface layer is dried, dip-coat the back layer slurry and sprinkle sand , Dry for 6-8 hours, and repeat 2 times to make the first back layer and the second back layer; use the back layer slurry as the sea...

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Abstract

The invention provides a method for preparing an overall shell mold by utilizing vaporizing combustion of mold shell roasting pattern. The method comprises the following steps: preparing a plastic mold by adopting an injection molding method, splicing and assembling the plastic mold to form an overall pattern, and coating, sanding, drying and hardening the overall pattern, thus obtaining a solid mold shell; roasting the obtained mold shell, wherein the pattern disappears due to vaporizing combustion, thus obtaining an overall shell mold; and finally, cleaning and pouring the obtained shell mold, thus obtaining the casting. The method is high in applicability, the complexity of the cast alloy types and casting structures is not limited, the processes of investment casting and dewaxing are reduced, the production cycle is shortened, and the production efficiency is improved. In the process of manufacturing the shell mold, a phenolic resin is not used as an adhesive, and the problems of pungent smell and subskin blowholes of castings in the process of casting and pouring the shell mold are solved. The pattern disappears before pouring due to roasting and vaporizing combustion of the mold shell, the defects of evaporative pattern casting steel casting recarburization and iron casting wrinkled skin are overcome, and the casting quality is improved.

Description

technical field [0001] The invention belongs to the technical field of shell mold casting, and in particular relates to a method for preparing an integral shell mold by gasifying and burning mold shell roasting patterns. Background technique [0002] Shell mold casting (shell mold casting) is a casting technology invented by the German J. Cronin in 1943. The surface of the casting is smooth and clean, and the size is accurate. It can be processed without machining or only a small amount of processing. It is especially suitable for large production batches and high dimensional accuracy. Castings with high requirements, thin walls and complex shapes. Shell casting uses the tipping bucket method to manufacture the shell, and the upper and lower (or left and right) two shells are clamped with clamps or glued with resin, and the mold can be formed without a sand box, which can significantly reduce the amount of molding sand. The shell is usually made of coated sand with phen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C13/08
Inventor 王再友杨少锋
Owner 沃尔曼科技张家港有限公司
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