Molding structure for green sand mold casting

A casting model and green sand technology, applied in casting molding equipment, casting molds, cores, etc., can solve the problems of large one-time investment and high cost of coated sand, and achieve high-strength effects

Inactive Publication Date: 2016-08-24
王德福
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use the coated sand to produce the mold shell with a core shooter and then pour it. This method is easy to realize, but the cost of the coated sand is high.
The second is to use sand-covered iron molds for production, which has high production efficiency, but the one-time investment is quite large

Method used

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  • Molding structure for green sand mold casting

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Embodiment Construction

[0015] Such as figure 1 As shown, a green sand casting molding structure includes an upper box type 1, a lower box type 2, a back sand 3 is placed at the bottom of the lower box type 2, and a casting model 4 is built in the middle between the upper box type 1 and the lower box type 2, The casting model 4 is covered with coated sand 5 around, and the upper part of the coated sand 5 in the upper box type 1 is provided with surface sand 6 . The thickness of the coated sand 5 is 3-4mm.

[0016] Molding sand material preparation:

[0017] (1) Back sand 3: The sand mixing process is the same as the traditional wet sand process.

[0018] (2) Surface sand 6: The sand mixing process is the same as the traditional wet sand process.

[0019] (3) Mixing coated sand 5: mix coated sand 5 with water and bentonite as binder.

[0020] Preparation method:

[0021] Add 8% bentonite and 4.5% water to the coated sand supplied in the market by weight (coated sand 87.5%), and mix coated sand 5 ...

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Abstract

The invention provides a molding structure for green sand mold casting. The structure comprises an upper case form and a lower case form, backing sand is placed at the bottom of the lower case form, a built-in casting model is arranged between the upper case form and the lower case form, coated sand covers the periphery of the casting model, and facing sand is arranged on the coated sand which is positioned in the upper case form. The thickness of the coated sand is 3-4mm. The molding structure for green sand mold casting is improved in order to realize quality requirements of products. A common molding structure is used for casting, precision casting effects are realized, and the production cost is lower than the production cost of coated sand casting.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a green sand casting molding structure. Background technique [0002] Green sand casting is one of the most common and widely used molding techniques in the foundry industry. It has the advantages of high production efficiency, short production cycle, low material cost and good yield, and is convenient for sand falling. However, when the wet sand mold is poured, water migration and gasification occur on the surface of the sand mold, which makes the casting prone to casting defects such as pores, sand inclusions, sand holes, sand swelling, and sand sticking. Therefore, green sand molding is generally limited to the molding of ordinary parts. It is difficult to produce parts that require high precision and zero defects in castings. For example: the flywheel of the engine is partially non-processed, and the product needs to be fully checked for dynamic balance. The outer process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C1/18
Inventor 王德福
Owner 王德福
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