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Technological method of using internal chill for expendable pattern negative pressure casting

A process method and negative pressure casting technology, applied in the field of casting, can solve the problems of thermal joint dispersion, scrapped castings, inability to perform centralized feeding, etc., and achieve the effects of strong applicability, low cost and simple structure

Active Publication Date: 2016-05-04
JIANGSU GRINKA MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the dispersion of hot joints, centralized feeding cannot be carried out. Shrinkage cavities and shrinkage defects are formed at the hot joints of castings after pouring and forming. These casting defects still exist after machining, resulting in the scrapping of castings.

Method used

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  • Technological method of using internal chill for expendable pattern negative pressure casting
  • Technological method of using internal chill for expendable pattern negative pressure casting
  • Technological method of using internal chill for expendable pattern negative pressure casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] The process of using internal cooling iron in lost foam negative pressure casting mainly includes the following steps:

[0025] (1) Selection of inner cooling iron material: the material of inner cooling iron 3 can be the filament 4 of the same material as the casting, and commercially available nickel-plated iron wire can be used for less demanding castings or parts that can be processed.

[0026] (2) Determination of the quality of the inner cooling iron: the quality of the inner cooling iron 1 can be determined according to the quality of the hot joint. Generally, the quality of the inner cooling iron is 2~3.5% of the mass of the hot joint.

[0027] (3) Preparation of inner cooling iron: preparation of inner cooling iron 3, with a cross-sectional area of ​​1~7mm 2 Commercially available nickel-plated iron wire or castings of the same

[0028] The filament 4 of the material is prepared by winding the inner cooling iron 3 with the same shape as the casting, and the to...

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Abstract

The invention belongs to the technical field of casting, and relates to a technological method of using internal chill expendable pattern negative pressure casting for producing a dispersed hot spot shrinkage porosity qualified casting without a shrinkage cavity inside. The method includes the steps of selecting an internal chill material, determining internal chill quality, manufacturing the internal chill, cleaning the internal chill, manufacturing internal chill formed foam model, conducting molding, performing casting and obtaining the casting after solidification. The same material as the casting or a commercially available nickel plated wire structure is adopted in the internal chill, so that the internal chill the same as the casting in shape is manufactured conveniently. The straight rod and winding combined structural form is adopted in the internal chill, the straight rod structure has fixing and supporting functions and can prevent that the internal chill collapses an expendable pattern cavity due to excessive mass. The internal chill is simple in structure, low in cost, easy to operate, high in reliability and applicability and suitable for the casting provided with dispersed hot spots and formed by an expendable pattern.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a process method for producing qualified castings without shrinkage cavity and shrinkage inside the dispersed heat joints by using internal cooling iron lost foam negative pressure casting. Background technique [0002] Lost foam casting is a new casting process method in the foundry industry. It is a combination of foamed plastic models similar in size and shape to the castings to form a model cluster. After brushing with a refractory coating and drying, it is buried in dry quartz sand for vibration molding. , a new casting method that pours liquid metal under negative pressure to vaporize the model and occupy the position of the model, solidifies and cools to form the required casting. The process of lost foam casting is much simpler than the traditional sand casting process. Its process advantages include: high casting precision, flexible design, no sand core and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D15/00
CPCB22C9/046B22D15/00
Inventor 燕声壮项恒新王章忠王红星
Owner JIANGSU GRINKA MACHINERY CO LTD
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