Cold-iron magnetic adsorption method for core-shooting sand core upper die

Abstract

The invention discloses a cold-iron magnetic adsorption method for a core-shooting sand core upper die, which is characterized by comprising the following steps: arranging a magnet above a sand core die to adsorb cold iron which needs to be placed on the sand core upper die, and then shooting sand into the die to obtain a sand core. The method has the creativity that the magnet is arranged at the die part where the cold iron needs to be placed, and the local sand core can be well positioned through the magnet, so the process is simple and easy to implement. The strength of the sand core manufactured by the method is high, and the wall thicknesses of all parts are uniform; sticking is not required, so wall seams of each part of the cavity can be fully eliminated; and the yield is high, and the adding amount of resin can be properly reduced.

Description

technical field [0001] The invention relates to a method for magnetic adsorption of a cooling iron on a core-shooting sand core, and belongs to the technical field of casting sand core production. Background technique [0002] In the casting process, for sand cores with complex shapes and structures, it is necessary to put chilled iron on the sand cores to improve the strength and quality of the sand cores. In the prior art, the sand cores of large castings are usually divided into several sand core parts to be manufactured separately, and then the sand core parts are bonded to obtain a complete sand core. Therefore, for each sand core part, a chill iron can be placed on the bottom of the sand core mold to make a sand core. Due to the manufacturing process of the existing sand core, the shape of the bonded seam is not regular enough, which will affect the strength of the final casting. With the improvement of product quality requirements, the existing core-shooting core-ma...

AI Technical Summary

Problems solved by technology

Due to the manufacturing process of the existing sand core, the shape of the bonded joint is not regular enough, which will affect the strength of the final casting

With the improvement of product quality requirements, the existing core-shooting core-making process can no longer meet the requirements, so it is necessary to use the production of integral sand cores to improve the quality of castings

However, when making a whole sand core, or combining several sand core parts into a large sand core, the cold iron that could have been placed at the bottom of the mold has changed its position, and some positions are on the upper mold of the sand core. It is difficult to fix, so the cold iron fixing of the whole sand core is one of the problems

Chinese patent 200710107328.3 discloses a method for producing integral cores of bolsters and side frames. It divides the sand cores into upper and lower pieces to make them, and then combines the two pieces to obtain an integral sand core. Although this method makes the upper and lower sand cores The cold iron can be placed at the bottom of the mold according to the existing technology for fixing, but the final integral sand core still has seams in the middle, so it is not a real integral sand core

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