A double box sand mold for casting aluminum alloy parts

Abstract

The invention belongs to the technical field of metal casting machining, and particularly relates to a dual box sand mould used for aluminum alloy component casting. The dual box sand mould comprisesan upper sand box and a lower sand box. The upper sand box and the lower sand box are fixed through bolts. Pin holes are formed in the outer walls of the sand boxes. Baffles are arranged on the outersides of the pin holes. Clamped connection grooves used for fixing the baffles are formed in the right sides of the baffles. Strong magnet lantern rings are arranged in screw holes. Cushion pipes arearranged in the strong magnet lantern rings, and corrugated springs are sleeved in gaps between the outer sides of the cushion pipes and the screw holes. External threads matched with internal threadsin the screw holes are arranged on the upper segments and the lower segments of screws of the bolts, the surface of the middle segment of each screw is free of a thread, and two contraction necks with the diameters gradually reduced are arranged in the middle segment of each screw. Limiting pins are arranged in the pin holes, and U-shaped grooves are formed in the front ends of the limiting pins.The sand mould is high in structural strength and strong in fastening function, the effects of vibration resistance and heat-resisting deformation prevention of the sand mould are relatively better,the screws cannot be locked in the casting process, and demolding is more convenient.

Description

technical field [0001] The invention belongs to the technical field of metal casting processing, and in particular relates to a double box sand mold used for casting aluminum alloy parts. Background technique [0002] Casting is a method of casting liquid metal into a casting cavity suitable for the shape of the part, and then cooling and solidifying it to obtain parts or blanks; it is one of the most commonly used processing methods for metal parts with complex structures. The mold materials used in casting are mainly sand, metal and ceramics; sand molds have become the most important mold materials because of their advantages of easy processing, easy demoulding, and low cost. [0003] According to different morphological characteristics, commonly used casting sand molds include different types such as two-box sand molds, three-box sand molds, pit sand molds, and core sand molds. Two-box sand molds are the simplest sand mold structure and can be applied to casting parts of ...

AI Technical Summary

Problems solved by technology

[0004] During the sand casting process, the model needs to be assembled and fixed. The stable assembly of the sand mold determines the accuracy of the processed pattern. If the structure of the sand mold cannot be assembled correctly, stably, and firmly, it may be due to its own weight, the erosion of molten metal, or vibration. Offset occurs, resulting in pattern distortion or structural defects

In addition, during the preparation process of the sand mold, it is necessary to shock the sand filling to ensure that the original sand is compact, and the loose combination of the original sand may also cause defects in the parts after casting

The vibration during the sand tightening process will affect the bonding strength of the sand mold; the conventional molding fixtures include bolts and buckles, etc. The bolts have a better fastening effect and are resistant to vibration. It remains stable, but due to the large amount of heat released in the sand mold during the casting process, the heat will cause deformation between the bolt and the screw hole, and eventually cause the bolt to lock, which will cause difficulties in dismantling the sand mold and demolding the part blank

The heat-resistant and anti-deformation effect of the buckle is good, and the problem of locking is not easy to occur; but the stability of the fastening effect of the buckle is relatively poor, and it is easy to loosen in a vibration environment, which affects the compaction effect of the sand mold and the casting parts machining accuracy

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