Precise casting technology for green sand vacuum sealing model

A technology of vacuum-sealed molding and precision casting, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc. It can solve problems such as dust pollution, long-term vacuuming, and coatings affecting production efficiency, so as to save costs, improve production efficiency, Effect of reducing energy consumption

Inactive Publication Date: 2011-10-19
JIAHE ZHONGHE CASTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a precision casting process for green sand vacuum-sealed molding, which uses wet sand instead of dry sand for molding, and solves the problem of serious dust pollution in the existing V method castin

Method used

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  • Precise casting technology for green sand vacuum sealing model
  • Precise casting technology for green sand vacuum sealing model
  • Precise casting technology for green sand vacuum sealing model

Examples

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Effect test

Embodiment 1

[0040]In this embodiment, the green sand made of standard casting silica sand, coal powder for casting, bentonite for casting and a small amount of water is used as the molding material. The EVA film is heated by the device; the EVA film that has been heated to form a mirror surface is attached to the mold, and the film is completely adsorbed on the surface of the mold under the action of vacuum negative pressure; Shaking, into a sand mold. After the molding is completed, the upper part of the sand mold is covered with a plastic film, and the vacuum pumping sand box is connected to the vacuum pumping system to pump negative pressure; at the same time, the vacuum valve in the pumping chamber of the negative pressure box is closed; the mold is lifted again to complete a mold-making work; change the model or Use the same process steps as the sand box to complete the upper mold; fasten the upper and lower molds to form the cavity to complete the entire molding work; put the sprue ...

Embodiment 2

[0042] This embodiment produces single-hole large-plane castings, and its technological process is as follows figure 1

[0043] ① Make foam modules, such as figure 2 The foam module shown in the cavity is made of polystyrene foam on the lower surface of the cavity, which is generally formed by foam molding or cutting bonding or cutting processing.

[0044] ②Select the molding material, which is made of standard casting silica sand, coal powder for casting, bentonite for casting and a small amount of water.

[0045] ③Make a vacuum-tight mold, such as Figure 4 As shown, a 0.1mm thick EVA film is selected and heated to 80-120°C to form a mirror surface. Under the action of vacuum negative pressure, the film is pasted on the surface of the model. The negative pressure box of the mold bottom plate is vacuumed at 0.03-0.05Mpa. Then move the model to the vibrating table, and add molding materials while compacting it. At the same time, put the foam module into the mold cavity. A...

Embodiment 3

[0049] This embodiment produces single-hole large-plane castings

[0050] ① Make foam modules, such as figure 2 The foam module shown in the cavity is made of polystyrene foam on the lower surface of the cavity, which is generally formed by foam molding or cutting bonding or cutting processing.

[0051] ② Select the molding material, which is made of standard casting silica sand, casting clay and a small amount of water.

[0052] ③Make a vacuum-tight mold, such as Figure 5 As shown, a 0.1mm thick EVA film is selected and heated to 80-120°C to form a mirror surface. Under the action of vacuum negative pressure, the film is pasted on the surface of the model. The negative pressure box of the mold bottom plate is vacuumed at 0.03-0.05Mpa. Then move the model to the vibrating table, and add molding materials while compacting it. At the same time, put the foam module into the mold cavity. After adding the molding sand, the shaking table stops vibrating, and covers the film on ...

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Abstract

The present invention provides a precise casting technology for a green sand vacuum sealing model, which belongs the vacuum casting technical field. The invention is characterized in that the green sand is taken as a molding material, quantity of the sand core can be minimized through an effective usage of foamed materials, which is suitable for producing medium and small sized comparative precision castings. The problems of serious dust pollution, long vacuum-pumping time and production efficiency affected by using paint in a present V method can be solved. When a complex cavity is casted, the foamed material is provided at the position unsuitable for drafting to form a portion of the cavity, the foamed material is melted when casting, therefore the purposes of minimizing sand core quantity and weight can be reached, so that the production technology can be simplified as well as cost can be saved. The produced casting has the advantages of high dimensional precision, clear contour and smooth surface.

Description

technical field [0001] The present invention relates to the molding process of casting products by vacuum sealing molding method (referred to as "V" method molding), especially the precision casting technology of green sand vacuum sealing molding with an inner cavity structure not suitable for drafting. Background technique [0002] V-method casting is a physical modeling method. The basic principle is to fill the special sand box with dry sand without water and no binder, slightly shake it tightly, and then vacuumize the mold surface and the sand mold covered with plastic film on the back of the sand box. The pressure difference makes the mold take shape. Because it does not use binder, it is convenient to shake out sand, which minimizes the consumption of molding materials, reduces waste sand, improves production conditions, and greatly improves the surface quality and dimensional accuracy of castings. (V method casting production and application examples / Xie Yihua, Xi...

Claims

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Application Information

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IPC IPC(8): B22C9/03B22C9/04
Inventor 叶升平黄乃雄徐奇黄华军
Owner JIAHE ZHONGHE CASTING
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