A high-precision die-casting mold with a local pressurization mechanism and its casting method

Abstract

The invention relates to a high-precision die-casting mold provided with a local pressurization mechanism, comprising an upper mold, a lower mold and a pressurization mechanism, the pressurization mechanism is arranged on the upper mold, and a workpiece is arranged between the upper mold and the lower mold Cavity, the upper mold is provided with a mounting cavity for installing a booster mechanism, and the mounting cavity passes through the workpiece cavity; the booster mechanism includes a gear, a rack, and a booster rod arranged in the mounting cavity And the left booster block and the right booster block that can move inward relative to the workpiece cavity at the same time, one end of the booster rod is provided with teeth that cooperate with the gear, after the casting in the die-casting mold is completed, the booster rod moves, The right booster block is driven to move to the left, while the teeth of the booster lever drive the gear to rotate, and the rack drives the left booster block to move to the right under the drive of the gear. The invention uses a pressurizing mechanism to effectively pressurize the "double ear" part of the product locally to form a feeding channel, which can effectively reduce or eliminate the shrinkage cavity problem at this part.

Description

technical field [0001] The invention relates to the technical field of die-casting molds, in particular to a high-precision die-casting mold and a casting method provided with a local pressurization mechanism. Background technique [0002] Shrinkage cavity and shrinkage porosity are common shrinkage defects inside die castings in traditional die casting. It is mainly reflected in the phenomenon of processing holes and pressure inspection air leakage caused by its poor compactness, which belongs to its technological characteristics. For products with high air tightness requirements, shrinkage cavities and shrinkage porosity will lead to product scrapping. The reason for its formation is the vacuum pores produced by the inability to feed inside the casting. The shrinkage of die castings generally occurs at the position where the wall thickness is uniform. From the general section, it usually occurs at the axis; from the cross section, it occurs at the center, so it is also c...

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Problems solved by technology

[0005] Aiming at the "double ears" part of the worm shell die-casting product, shrinkage cavity and shrinkage defects are easily formed during solidification. The present invention is to provide a high-precision die-casting mold with a local pressurization mechanism and its casting method. The present invention is aimed at worm To solve the problem of shrinkage cavity in the "double ear" part of the shell die-casting, a gear rack two-way linkage supercharging mechanism is designed to effectively pressurize the "double ear" part locally, forming a feeding channel, and solidifying under high pressure, which can Effectively reduce or eliminate the shrinkage cavity problem in this part

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