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Dead head-free casting technology

A casting process and riser technology, which is applied in the field of non-riser casting process, can solve problems such as defects, shrinkage of holes, and external quality of casting cold insulation, and achieve the effects of easy production, accurate size, and weight saving

Inactive Publication Date: 2012-10-24
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

[0006] The purpose of the present invention is to provide a riser-free casting process that makes the casting material more compact and can increase the yield, so as to solve the technical problems that the traditional riser-free casting process is easy to cause shrinkage of holes, cold shut of castings and poor appearance quality

Method used

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Embodiment Construction

[0031] 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.

[0032] see figure 1 , using the riserless casting process of the present invention to cast such as figure 1 The box body shown comprises the following steps:

[0033] S1: Fill the metal mold with the same size and shape as the casting with resin sand.

[0034] S2: Set the slag discharge piece 9, the inner cooling iron 8 and the drainage piece in the resin cavity; the specific steps are as follows:

[0035] S201: Place slag discharge sheets 9 made of foam material at intervals on the box wall of the casting in the resin cavity.

[0036] In this embodiment, the slag discharge piece 9 is a rectangular thin slice, and the cross section of the rectangular thin slice is trapezoidal. The dimensions of the trapezoidal length×width×thickness are 50mm×40mm...

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Abstract

The invention discloses a dead head-free casting technology, which comprises the following steps of: filling and modeling a metal die which has the same size and shape with those of a casting by resin sand; arranging deslagging sheets made of a foam material at intervals on the box wall of the casting in a resin cavity; according to a position on which a hole needs to be processed in the casting, inserting an inner chill into the corresponding position in the resin cavity; according to the position of a pouring gate hole, arranging a drainage piece on the corresponding position in the resin cavity; taking out the metal die; solidifying the resin sand to form a resin cavity; carrying out bottom-pouring-type pouring under the vacuum negative pressure to enable the resin cavity to be full of liquid metal; and after the liquid metal is solidified and cooled, removing loose resin sand on the surface of the casting to obtain the casting. According to the dead head-free casting technology disclosed by the invention, the material of the casting is tighter, and the finished product rate can be improved.

Description

technical field [0001] The invention relates to the field of metal casting, in particular to a riserless casting process. Background technique [0002] The graphitization expansion of ductile iron castings in the casting process, in order to reduce the displacement of the shape wall caused by the graphitization expansion of the casting pressure box, promote the graphitization expansion to the interior of the casting, so as to improve the density of the casting and the mechanical properties of the casting body. Resin flasks with better rigidity and dry molding sand should be used for molding. When multiple resin flasks are combined in blocks, they must be firmly connected and locked with bolts. [0003] Using the traditional resin sand casting process, casting such as figure 1 The casting body 1 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 7 is only 10mm, and...

Claims

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Application Information

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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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