Universal bottom mold for pouring precoated sand mold

A film-coated sand mold and bottom mold technology, which is applied in the directions of casting molds, cores, and casting mold components, can solve the problems of easy inclusions on the surface of products, insufficient filtration of alloy liquid, etc., to improve surface quality, reduce internal inclusions, Smooth filling effect

Inactive Publication Date: 2014-07-30
贵阳百德铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a universal bottom mold for coated sand casting, which solves the problems of insufficient filtration of alloy liquid and easy occurrence of inclusions on the surface and inside of the product in the ordinary coated sand casting process.

Method used

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  • Universal bottom mold for pouring precoated sand mold
  • Universal bottom mold for pouring precoated sand mold
  • Universal bottom mold for pouring precoated sand mold

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 Cooperate with pouring 204 pump cover castings with the general-purpose bottom mold of described film-coated sand casting

[0027] 204 pump cover casting weighs 8.8Kg per piece, and its external dimensions are 202mm×166mm×60mm. Shell-type casting and forming two products), the pouring method is bottom injection type, that is, the molten iron enters the shell-shaped cavity of the coated sand part after being filtered from the general bottom mold, the diameter of the sprue is φ30mm, and the diameter of the riser is φ70mm, Two castings are fed with one riser. There are five layers of shell-shaped stacked boxes for parts (excluding the general bottom mold), and the pouring time of molten iron is 1 minute and 20 seconds. Using the universal base mold for coordinating casting, the qualified rate of castings is greater than 97%, and the qualified rate of castings before using the universal base mold is 60% to 70%.

Embodiment 2

[0028] Example 2 Use the coated sand mold to cast the general bottom mold and cast 204 valve body castings

[0029] The single piece weight of 204 valve body casting is 1.6Kg, and the external dimension is 49mm×47mm×55mm. In the shell mold cavity of the sand part, the diameter of the sprue is φ25mm, and the diameter of the riser is φ60mm. One riser is used to feed six castings. There are 10 layers of shell-shaped stacked boxes of parts (excluding the general bottom mold), and the pouring time of molten iron is 50 seconds. Using the universal bottom mold for coordinating casting, the qualified rate of castings is greater than 98%, and the qualified rate of castings before using the universal bottom mold is 75% to 85%.

Embodiment 3

[0030] Example 3 Use the film-coated sand mold to cast a general bottom mold and cast a certain type of casting

[0031] The casting weighs 3.68Kg per piece, and its external dimensions are 219mm×170mm×74mm. The casting has a large shape, but its shape is simple, without a sand core. Two products), the pouring method is the bottom injection type, that is, the molten iron enters the shell mold cavity of the coated sand part after being filtered from the general bottom mold, the diameter of the sprue is φ25mm, and the diameter of the riser is φ50mm, and a riser is used Feed two castings. There are 8 layers of shell-shaped stacked boxes for parts (excluding the general bottom mold), and the pouring time of molten iron is 65 seconds. Using the universal bottom mold for coordinating casting, the qualified rate of castings is greater than 95%, and the qualified rate of castings before using the universal bottom mold is 70% to 80%.

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Abstract

The invention discloses a universal bottom mold for pouring a precoated sand mold. The universal bottom mold comprises an upper mold (4), a lower mold (5), a pouring gate (1) and a riser (3), wherein the lower mold (5) is provided with a positioning boss A (7) and a positioning boss B (8); a backflush groove (9), a slag deposition ladle (2) and a filtering net (6) are arranged in a passage between the pouring gate (1) and the riser (3). By virtue of the backflush groove (9), the slag deposition ladle (2) and the filtering net (6), a molten alloy liquid is filtered and purified fully and smooth mold filling of the molten alloy liquid is achieved; after casting molding, the surface quality is enhanced and internal purities are few. Multiple layers of precoated sand part shell molds can be superposed on the universal bottom mold to perform pouring.

Description

technical field [0001] The invention belongs to the field of film-coated sand casting, and in particular relates to a general bottom mold for film-covered sand casting. Background technique [0002] With the advancement of technology, the requirements for product quality are getting higher and higher. For casting products, not only the internal quality but also the appearance quality are required. In order to be able to compare with foreign product quality, the coated sand casting technology has begun to be adopted by domestic foundry manufacturers. use. Usually, in the design of the coated sand pouring system, the traditional pouring riser is mainly used. The alloy liquid directly enters the cavity from the gate and is cooled to form. There is generally a filter at the gate, but the filtering effect is not good, which will affect the casting in severe cases. surface quality and internal quality. Chinese patent: A film-coated sand shell type for producing flat gaskets (app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/08
Inventor 黄启贵吴胜兵
Owner 贵阳百德铸造有限公司
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