Method for V-method shaping anti-gravity pouring of aluminum alloy casting

Abstract

The invention provides a method for V-method shaping anti-gravity pouring of an aluminum alloy casting, which is applied to the technical field of casting. The method for the V-method shaping anti-gravity pouring of the aluminum alloy casting comprises the following steps: V-method shaping, resin sand core making or V-method core making is adopted; resin sand shaping or shaping and sand making are formed by a V method; a lower box and a middle box adopt the V method or the resin sand shaping; an anti-gravity pouring manner is adopted and a metal separation plate has sealing and bearing effects; metal liquid is filled into a transverse pouring gate, an inner sprue, a casting and an open riser under the effect of pressure along a liquid rising pipe from bottom to top in an anti-gravity direction; and the open riser is formed in the top of the casting and a liquid level detector is used for stopping pressurizing when the filling height of the metal liquid reaches the liquid level detector, so that the liquid metal is suspended at the position. The method can be used for producing the aluminum alloy casting with good inner quality, high size precision and excellent surface quality; and sand is convenient to clean, working conditions are good and the cost is saved.

Description

technical field [0001] The invention relates to a method for anti-gravity pouring of V-method molding of aluminum alloy castings in the technical field of casting. Background technique [0002] At present, the V method molding method, also known as vacuum sealing molding method or negative pressure molding method, uses plastic film to vacuumize dry sand and is an advanced physical molding method. The castings produced by V-method casting have good surface quality, high dimensional accuracy, easy molding from the sand box, no draft angle (even -1° draft angle is allowed), simple sand treatment process, and basically all old sand can be reused. , reduced modeling cost, less pollution and good working conditions, these unique advantages make it widely used in construction machinery parts, wear-resistant lining parts, auto parts, bathtubs, valve parts, railway switches and piano string parts at home and abroad, etc. fields are widely used. Compared with wet casting, the surfac...

AI Technical Summary

Problems solved by technology

Since gravity casting is prone to casting defects such as oxidized slag inclusions and pores, it is difficult to guarantee the internal quality of castings

Low-pressure casting or differential pressure casting is more suitable for the production of such castings, but for such castings, due to the structure of "thick upper and lower and thin in the middle", it is not conducive to the formation of sequential solidification conditions, and the supplementary riser at the top The shrinkage effect is difficult to meet the technical requirements

In addition, for a box aluminum casting, resin sand molding is used, because the side wall does not allow a draft angle, and there are many parting sand blocks, which seriously affects the dimensional accuracy of the casting and the molding operation

At the same time, resin sand molding is used, the consumption of resin sand is large, the cleaning environment is harsh, and the surface roughness of castings is difficult to meet the technical requirements, and the surface quality is worse due to the use of chilled iron

[0005] Today, there is no public publication report and application of V-method molding anti-gravity casting technology for aluminum alloy castings at home and abroad. Compared with resin sand mold anti-gravity casting and V-shaping gravity casting Breakthrough, not only retains some advantages of V method molding and anti-gravity pouring, but also overcomes the disadvantages of temperature distribution in anti-gravity pouring that is not conducive to the feeding of the upper part of the casting. At the same time, it has some differences from conventional resin sand anti-gravity casting For example, anti-gravity casting cannot be equipped with open risers at present, and V-method casting requires the use of open risers, and the conventional anti-gravity casting process cannot be simply applied, otherwise it is easy to cause serious accidents such as sand sticking, box collapse, and fire escape.

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