Special sand magnetic adsorption method for core-shooting sand core upper die

Abstract

The invention discloses a special sand magnetic adsorption method for a core-shooting sand core upper die, which is characterized by comprising the following steps: separating out the part of a sand core where special sand needs to be placed to manufacture a local sand core, placing the special sand on the local sand core, and embedding a steel plate in the local sand core; putting the local sandcore in an integral core box, and positioning the local sand core through a magnet; and manufacturing an integral sand core at one time, and combining the prefabricated local sand core into the integral sand core. The method has the creativity that the sand core part with the special sand (and cold iron) is manufactured into the local sand core, the magnet is arranged above the integral core box where the special sand 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.

Description

technical field [0001] The invention relates to a magnetic adsorption method for special sand 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 add special sand on the surface of the sand core to improve the quality and local special effects of the sand core. 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, in the traditional process, for each sand core part, special sand can be placed at the bottom of the sand core mold, and then the sand core can be made by sand injection. 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 ...

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Problems solved by technology

Because the special sand 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, which is difficult to fix

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 All the characteristic sands can be placed at the bottom of the mold according to the existing technology for fixing, but there are still joints in the middle of the final integral sand core, so it is not a real integral sand core

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