A method for improving sand-filled molding of core-shooting molds

Abstract

The invention relates to a method for raising sand-filled molding of a core-shooting mold. By sealing the core-shooting mold as a whole, a mechanical pump is used to evacuate the entire inner cavity of the mold, and the overall negative pressure of the inner cavity of the mold is realized during sand filling, thereby reducing the The purpose of increasing the sand filling resistance, increasing the sand filling rate, and improving the quality of the sand core. The beneficial effects of the present invention are: breaking the conventional design concept, utilizing the characteristics of the overall negative pressure in the mold cavity during sand filling, increasing the exhaust pressure difference, increasing the exhaust power, and reducing the sand filling resistance; Unobstructed, the flow rate of the sand is improved, and the kinetic energy of the sand is increased; the quality of the sand core is significantly improved; the defects of the sand core are reduced, the time-consuming and labor-intensive man-made repairs are reduced, the production cost is reduced, and the production efficiency is improved; , to avoid the leakage of catalyst gas, and achieve the goal of green production; the design structure of the mold is optimized, the quality of the mold is improved, and the service life is extended.

Description

technical field [0001] The invention belongs to the field of mold forming, and in particular relates to a sand-filled molding method for lifting a core-shooting mold. Background technique [0002] The currently used core shooting mold is to reserve a certain design gap between the sand filling plate and the upper mold, and the air in the mold cavity is discharged from the upper and lower molds during the sand filling process. The exhaust of the upper mold is discharged from the gap between the upper mold and the sand-filled plate, and the exhaust of the lower mold is pumped out by the mechanical pump through the support space. This structure makes the core-shooting mold in a connected state with the outside world, the exhaust pressure difference is small, the sand filling molding resistance is large, and the sand core is prone to quality defects. [0003] With the continuous complexity of sand core structure and the continuous improvement of sand core quality requirements, ...

AI Technical Summary

Problems solved by technology

Therefore, the currently used core-shooting mold design scheme shows obvious defects and deficiencies. The design and manufacture of core-shooting molds is difficult, which affects sand-filled molding in actual production.

The quality problem of the sand core directly affects the efficiency and quality of casting production, causing serious losses to casting production

In addition, the production site is relatively prone to sand filling and air leakage or even sand leakage.

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