Sand box for sand casting of bent pipe and sand core of sand box

Abstract

The invention discloses a sand box for sand casting of a bent pipe and a sand core of the sand box. The sand box comprises an upper sand box and a lower sand box, wherein two or more sand shooting holes are formed in the upper sand box; an exhaust hole and a sprue are formed in the upper sand box; the sprue communicates with a runner; an upper mold cavity is arranged in the upper sand box; a lowermold cavity is arranged in the lower sand box; the sand core comprises an upper half sand core and a lower half sand core; formed core bars are correspondingly arranged in the upper half sand core and the lower half sand core; both ends of the formed core bars correspondingly penetrate out of both ends of the upper half sand core and the lower half sand core, and are welded with the inner wall ofthe sand box; cuboid core heads I are correspondingly arranged at both ends of the upper half sand core; cuboid core heads II are correspondingly arranged at both ends of the lower half sand core; anupper sand mold is arranged between the upper sand box and the upper mold cavity; and a lower sand mold is arranged between the lower sand box and the lower mold cavity. The sand box for the sand casting of the bent pipe and the sand core of the sand box have the beneficial effects that the use of a core support for supporting is not needed; the sand core can be effectively prevented from tiltingand floating; and the phenomenon of misalignment during the box assembling process can be prevented.

Description

technical field [0001] The invention relates to a sand mold casting device, in particular to a sand box and a sand core for elbow type sand mold casting. Background technique [0002] For sand casting elbow castings, conventional core heads are generally used. After the core is placed, the structure of the sand core will tilt into the cavity under the action of gravity. In addition, when molten steel is injected into the cavity, the buoyancy of the molten steel will cause the core Floating upward, due to these two reasons, will lead to uneven wall thickness of the casting. In the prior art, in order to fix the sand core, it is necessary to add two iron core supports at the upper and lower wall thickness positions of the cavity to support and fix the sand core, so as to prevent the core from tilting after lowering the core and floating after injecting molten steel. However, the high internal quality requirements of the pressure-bearing valve body do not allow the existence o...

AI Technical Summary

Problems solved by technology

This method greatly increases the cost of casting production, and there is a risk of core support missing removal

Secondly, the current sand box has a dislocation phenomenon when it is combined, which causes the dislocation of the internal cavity and increases the failure rate of the product

Images