Core manufacturing method and device for large sand core

Abstract

The invention discloses a core manufacturing method and device for a large sand core. A sand blowing mechanism is provided, the bottom end of the sand blowing mechanism is matched with each inlet in the top of a core box, and the top end of the sand blowing mechanism is matched with the bottom end of a sand shooting mechanism; the sand blowing mechanism has a sand blowing position for moving into the space between the sand shooting mechanism and the core box and a degree of freedom for moving out from the position, and is provided with a lateral sand feeding structure; the sand shooting mechanism is moved upwards, the sand blowing mechanism is moved to the sand blowing position, and then the sand shooting mechanism is moved downwards to press the sand blowing mechanism; sand is added into the sand blowing mechanism, air is blown, the molding sand enters the core box, the sand blowing pressure is 0.1 MPa-0.2 MPa, and the sand blowing amount is 80%-90% of the mass of the sand core; the sand shooting mechanism is moved upwards, the sand blowing mechanism is moved out from the sand blowing position, and then the sand shooting mechanism is moved downwards to press the core box; remaining molding sand is shot into the core box through the sand shooting mechanism, meanwhile, the sand core is compacted, and the sand shooting pressure is 0.4 MPa-0.5 MPa; and the sand core is subjected to air blowing curing, and a core is manufactured. According to the method and device, core manufacturing of the large sand core is realized.

Description

technical field [0001] The invention relates to a core-making method for casting sand cores, in particular to a method and device for preparing large-scale sand cores using a cold core process. Background technique [0002] When preparing a casting with a hollow structure, a sand casting method is usually used, and it is necessary to prepare a sand core corresponding to the hollow structure of the casting. The equipment for preparing sand cores is a core shooter. Usually, a sand shooting cylinder is installed on the top, and the bottom of the sand shooting cylinder is connected to the shooting head. The bottom plate of the shooting head is provided with a sand shooting plate. The top of the box is correspondingly provided with an opening. In the cold core process, it usually includes the sand shooting process, which uses the air flow to drive the core sand in the sand shooting cylinder, so that it is sprayed out from the nozzle through the injection head, enters the core bo...

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 tu

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