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Vacuum negative-pressure los mould casting technique

A technology of lost foam casting and vacuum negative pressure, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., and can solve the problems of complex process, high processing cost, casting castings with screw holes, etc.

Inactive Publication Date: 2008-12-31
泰州市永昌冶金设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Existing lost foam casting technology cannot directly cast castings with screw holes, especially castings with small-diameter screw holes. hole, and finally weld the nut into the hole machined above
The process is complicated and the processing cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, a vacuum negative pressure lost foam casting process, comprising the following process steps:

[0045] 1. The main parts are made of polystyrene and EPS mixed foam materials. When cutting, processing and bonding the foam plastic board to make the pattern, ensure that the surface of the pattern is smooth without obvious protrusions and depressions. Its shape and The dimensions are exactly in accordance with the requirements of the pattern drawing. The main parts are made into blocks, and dried to remove moisture, so that the shape is dimensionally stable and has a certain strength and rigidity.

[0046] 2. Bond the main components with the lost foam hot melt adhesive produced by Jinan Zongyuan Casting Material Technology Co., Ltd. to form an overall model consistent with the main shape of the casting.

[0047] 3. Use a nut mold consisting of two parts whose inner diameter is only 1‰ larger than the screw hole to be processed, the other inner surface geomet...

Embodiment 2

[0057] Embodiment 2, a vacuum negative pressure lost foam casting process, comprising the following process steps:

[0058] 1. The main parts are made of polystyrene EPS and EPMMA mixed foam materials. When cutting, processing and bonding the foam plastic board to make the pattern, ensure that the surface of the pattern is smooth without obvious protrusions and depressions. The shape and size are exactly in accordance with the requirements of the pattern drawing. The main parts are made into blocks, and dried to remove moisture, so that the shape is dimensionally stable and has a certain strength and rigidity.

[0059] 2. Bond the main components with the lost foam hot melt adhesive produced by Jinan Zongyuan Casting Material Technology Co., Ltd. to form an overall model consistent with the main shape of the casting.

[0060] 3. Use a nut mold composed of two parts that has the same geometric parameters of the inner surface as the screw hole to be processed or only 6‰ of the ...

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Abstract

The invention relates to a vacuum negative pressure lost foam casting process, which belongs to the technical field of casting. The process comprises the following steps: an integral mold of a screw is obtained by using resin bonded sand with a nut which has the same inner surface geometric parameters as that of or a little bigger internal diameter than that of a screw hole to be processed; the mold of the screw is taken out, coated with a coating and baked dry; then a hole is cut at the position of the screw hole to be processed on the integrally cast overall mold; finally the screw mold is inserted into the cutting hole and assembled to form the final mold; that is, the vacuum negative pressure lost foam casting process can be directly used for casting a casting with the screw hole, which creates a precedent of directly casting small-aperture screw holes without reprocessing in the casting field. The screw hole processed by the process can ensure precision and needs no reprocessing. The vacuum negative pressure lost foam casting process is especially applicable to the vacuum negative pressure lost foam casting of the casting with a plurality of screw holes, small size and high precision.

Description

(1) Technical field: [0001] The invention relates to a vacuum negative pressure lost foam casting process, which belongs to the technical field of casting. (two) background technology: [0002] The lost foam casting technology is to combine the foam type bonding of the castings with similar size and shape into a model cluster, brush the refractory paint and dry it, bury it in the dry quartz sand and vibrate the shape, and pour it under negative pressure to vaporize the model and liquefy the metal. A new casting method that occupies the position of the model and forms a casting after solidification and cooling. It has outstanding advantages such as high dimensional accuracy of castings, smooth surface, less pollution, etc. Compared with traditional casting technology, it has strong competitiveness. It is known as the casting technology of the 21st century and the green revolution of the foundry industry. [0003] In the prior art, the commonly used lost foam casting method i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06B22C9/04
Inventor 孔维民孔德礼吴正海杨卫根树长根
Owner 泰州市永昌冶金设备有限公司
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