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Vacuum lost foam casting process

A technology of vacuum lost foam and casting technology, applied in the field of metal casting, can solve the problems of porosity, shrinkage porosity, poor surface quality of casting cold insulation, etc., and achieve the effect of high yield, high quality of finished products and accurate size

Inactive Publication Date: 2014-01-15
湖南三星机床有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a vacuum lost foam casting process that can make the material of the casting more compact and the size more accurate; Poor quality technical issues

Method used

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Embodiment Construction

[0036] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0037] see Figure 4 , using the vacuum lost foam casting process of the present invention to cast such as figure 2 Shown casing 2, comprises the following steps:

[0038] S1: A cavity diaphragm with the same size and shape as the casting is formed by bonding foam sand particles.

[0039] S2: Set the slag discharge sheet 11, inner cooling iron 10 and drainage sheet on the cavity diaphragm; the specific steps are as follows:

[0040] S201: Place slag discharge sheets 11 made of foam material at intervals on the box wall of the casting cavity diaphragm.

[0041] In this embodiment, the slag discharge sheet 11 is a rectangular sheet, one side of the slag discharge sheet 11 of the rectangular sheet is flush with the top of the cavity diaphragm, and ...

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Abstract

The invention discloses a vacuum lost foam casting process which includes the following steps: bonding and combining foam sand to form a cavity membrane with the same size and shape with a casting part; placing deslagging sheets made of foam materials at the wall thickness position of the cavity membrane at intervals; inserting internal chill at the corresponding positions of the cavity membrane according to the hole positions on the casting part needing processing; arranging drainage sheets at the corresponding positions of the cavity membrane according to the position of a runner port; brushing fireproof coatings on the cavity membrane, drying the cavity membrane and burying the cavity membrane in quartz sand for vibration molding; performing bottom injecting type pouring under vacuum negative pressure, simultaneously filling in oxygen to lead the cavity membrane to burn and gasify, and leading liquid metal to occupy the space position of the cavity membrane; and solidifying and cooling the cavity membrane to form the casting part. The vacuum lost foam casting process enables the casting part to be compact in texture and accurate in size, and can improve rate of finished products.

Description

technical field [0001] The invention relates to the field of metal casting, in particular to a vacuum lost foam casting process. Background technique [0002] Such as figure 1 As shown, the traditional vacuum lost foam casting process adopts resin sand molding process, uses 2 blanking risers 4 to feed liquid metal, and the 2 blanking risers 4 are connected by runners 3. The size of the risers A gas outlet riser 5 is arranged on the opposite side, and the workpiece 1 is cast by top injection. [0003] Using the traditional vacuum lost foam casting process, casting such as figure 2 The casting body 2 of the booster box of the boom-type concrete pump truck shown is made of QT450-10, and the wall thickness difference is large. The thickness of the thin wall part 9 is only 10mm, and the thickness of the thick wall part 8 is 55mm. 6 pieces of M12 and 1 piece of and 1 M20 hole 7, such as image 3 As shown, the casting needs to be pressure tested to 0.7Mpa and must not leak....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/06B22C9/04
Inventor 喻朝晖
Owner 湖南三星机床有限公司
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