Precise investment casting technology

It is a technology of investment precision casting and technology, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc. It can solve the problems of casting deformation, casting product bulging, and many manufacturing processes, and achieve good strength and heat resistance. Product size High precision and good storage stability

Active Publication Date: 2015-11-18
NINGBO TIANYE PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are still some problems in the existing domestic investment casting technology, such as many manufacturing processes, especially the existence of the molding process, which increases the labor intensity and increases the manufacturing cost.
Since the molding process of investment precision casting is simply to bury the mold shell with molding sand, the supporting strength and hardness of the molding sand are very poor, resulting in defects such as bulges, shrinkage cavities, and shrinkage of the casting product after pouring, and the finished product of the casting The low rate has always been a difficult problem for investment casting
Not only that, the low strength of the mold shell made by domestic investment casting, which leads to the defects of casting deformation and low casting dimensional stability, is also a problem that many companies in this industry are difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] During the preparation of the coating, after adding deionized water, it is preferably stirred for half an hour. In order to improve the coating performance of the surface coating, it is necessary to add 0.1-0.2 parts by weight of surfactant during preparation, but at this time, when the paint is stirred, a large amount of gas will be involved and the bubbles will increase, so it is necessary to add 0.2-0.3 parts by weight at the same time The defoamer removes the air bubbles of the surface layer coating. The surfactant used in the present invention is preferably stearic acid or sodium dodecylbenzenesulfonate; the defoamer used in the present invention is preferably n-octanol defoamer.

[0034] Fused corundum has the advantages of high melting point (2050°C), compact structure, good thermal conductivity, etc., and its thermal expansion rate is small and uniform. The total expansion from room temperature to 2000°C is about 2%. In addition, corundum is an amphoteric oxide...

Embodiment 1

[0045] Step 1, mold development, the present invention adopts VMCL600 vertical machining center bed type CNC milling machine to set molds, such as some precision parts of auto parts castings.

[0046] Step 2, mold making, using the mold to inject wax to prepare a wax model of the product, which is the investment molding process. First configure the mold material, the components of the mold material and the parts by weight of each component are as follows: 35 parts by weight paraffin wax, 22 parts by weight octyl stearate, 23 parts by weight microcrystalline wax, 15 parts by weight polyamide wax, 15 parts by weight Polyethylene wax, 3 parts by weight of SEBS, 1 part by weight of xylene.

[0047] When configuring the above substances, an electric hot water bath melting device is used, and the specific operation steps are as follows:

[0048] S1: Weigh the above-mentioned substances in proportion, put the above-mentioned substances into a dry water-bath stainless steel or alumin...

Embodiment 2

[0068] Step 1, mold development, the present invention adopts VMCL600 vertical machining center bed type CNC milling machine to set molds, such as some precision parts of auto parts castings.

[0069] Step 2, mold making, using the mold to inject wax to prepare a wax model of the product, which is the investment molding process. First configure the mold material, the components of the mold material and the parts by weight of each component are as follows: 36 parts by weight paraffin wax, 23 parts by weight octyl stearate, 23 parts by weight microcrystalline wax, 16 parts by weight polyamide wax, 15 parts by weight Polyethylene wax, 4 parts by weight SEBS, 1 part by weight xylene.

[0070] When configuring the above substances, an electric hot water bath melting device is used, and the specific operation steps are as follows:

[0071] S1: Weigh the above-mentioned substances in proportion, put the above-mentioned substances into a clean water-bath stainless steel or aluminum c...

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PUM

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Abstract

The invention provides a precise investment casting technology. In the wax laminating process, polyethylene wax and SEBS elastomers are inserted into paraffin, microcrystalline wax and ethylhexyl stearate in a penetrating manner, a grid-interpenetration structure is formed, and the strength of the structure is improved; polyamide wax swells under the effect of xylene to generate paste thixotropic agents; and a net-shaped structure is formed, the good strength and the good heat resistance are achieved, the storage stability is good, and the quite good anti-settling effect is achieved in the coating system. As for coatings adopted in the precise investment casting technology, polyvinyl alcohol and hydroxymethyl cellulose serve as auxiliary binding agents, silica sol serves as a main binding agent, and fused alumina, cubic boron nitride and titanium nitride serve as main fireproof materials, so that a manufactured shell is good in heat resistance and high in strength. In this way, an alloy steel investment cast product manufactured with the precise investment casting technology is high in size accuracy, fewer in casting crack and reliable in quality, and a casting obtained through casting with the technology is smooth in surface and high in quality.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to an investment precision casting process. Background technique [0002] The investment casting process is usually divided into replica casting, molten lead casting and lost wax casting. Among them, lost wax casting is lost foam casting, also known as investment casting. Investment casting is a casting process with little or no cutting, and it is an excellent process technology in the foundry industry. Investment precision casting is widely used, not only suitable for casting of various types and alloys, but also the dimensional accuracy and surface quality of the castings produced are higher than other casting methods. Therefore, other casting methods are difficult to cast complex, high temperature resistant , Castings that are not easy to process can be cast by investment casting. [0003] The practical application of modern investment casting methods in industrial production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C7/02C22C38/14
Inventor 崔建业
Owner NINGBO TIANYE PRECISION CASTING
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