Method and device for making large sand cores

Abstract

The invention discloses a core-making method and device for a large-scale sand core, and provides a sand-blowing mechanism, the bottom end of which is matched with each inlet of the top of the core box, and the top end is matched with the bottom end of the sand-shooting mechanism; The sand blowing position between the mechanism and the core box and the degree of freedom to move out from this position have a lateral sand injection structure; move the sand injection mechanism up, the sand blowing mechanism moves into the sand blowing position, and then move the sand injection mechanism down to press and blow Sand mechanism: add sand to the sand blowing mechanism and blow air to make the molding sand enter the core box, the sand blowing pressure is 0.1 MPa ~ 0.2 MPa, and the sand blowing amount is 80 ~ 90% of the quality of the sand core; the sand shooting mechanism moves up, blowing The sand mechanism is moved out of the sand blowing position, and then the sand shooting mechanism is moved down and the core box is compressed; the remaining molding sand is injected into the core box through the sand shooting mechanism, and the compaction of the sand core is completed at the same time, and the sand shooting pressure is 0.4 MPa ~ 0.5 MPa; Blow the sand core to solidify to complete the core making. The invention realizes the core making of large sand cores.

Description

technical field [0001] The invention relates to a core-making method for foundry sand cores, in particular to a method and a device for preparing large-scale sand cores by using a cold core process. Background technique [0002] When preparing a casting with a hollow structure, a sand casting method is usually used, and a sand core corresponding to the hollow structure of the casting needs to be prepared. The equipment for preparing the sand core is a core shooting machine. Usually, a sand shooting cylinder is set at the top, and the bottom of the sand shooting cylinder is connected to the shooting head. The bottom plate of the shooting head is set with a sand shooting plate. The top of the box is correspondingly provided with an opening. In the cold core process, it usually includes a sand-shooting process, which uses air flow to drive the core sand in the sand-shooting cylinder, so that it is ejected from the nozzle through the shooting head, enters the core box and is un...

AI Technical Summary

Problems solved by technology

However, from the perspective of casting technology, the method of horizontal sand shooting is used for large sand cores, resulting in a large difference in density between the upper and lower sides of the sand core, and more floating sand on the surface of the sand core, which seriously affects the surface quality of the sand core, which in turn affects the precision and surface quality of the casting. Especially when the upper plane of the sand core exceeds 2 square meters, it will be difficult to complete the manufacture of the sand core

For sand cores with a mass of 1000L (about 1400kg) and above, similar difficulties will be encountered in the preparation of existing technologies

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