A secondary ejection die-casting mold

Abstract

The invention relates to the technical field of die-casting dies, in particular to a secondary ejection die-casting die. The secondary ejection die-casting die comprises a die plate, an insertion pin, an ejection pin, a return pin, a front ejection pin plate, a rear ejection pin plate and a bottom plate, wherein the die plate comprises a first rear die plate and a second rear die plate; the insertion pin is connected with the second rear die plate; the ejection pin is connected with the front ejection pin plate; the return pin is connected with the rear ejection pin plate; the bottom plate is arranged below the rear ejection pin plate; a spacing bounce device is arranged between the rear ejection pin plate and the front ejection pin plate; the spacing bounce device comprises an upper spacing block, a middle spacing block and a lower spacing block; the upper spacing block is connected with the front ejection pin plate; the middle spacing block is elastically connected with the rear ejection pin plate; the lower spacing block is connected with the bottom plate and connected with the upper spacing block in a sliding manner; during die assembly, the upper spacing block is fastened with the middle spacing block; and during die opening, after the upper spacing block drives the middle spacing block to move a distance, the middle spacing block is in oblique surface fit with the lower spacing block to allow the middle spacing block to be separated from the upper spacing block. The die can effectively solve the problem of an insufficient ejection force during the die opening.

Description

technical field [0001] The invention relates to the technical field of die-casting molds, in particular to a secondary ejection die-casting mold. Background technique [0002] Die castings come in various shapes. After the die casting work is completed, ejector pins are generally used to push the die castings out of the pouring cavity. There are many products with large through-holes in the structure, such as some automotive parts. For the production of such products by die-casting, there are mainly two technical difficulties in the following aspects: First, on the rear mold core of the rear template of the die-casting mold It is impossible to place enough thimbles for ejecting the product. At the same time, the product forms a large tight force on the insert pin at the position of the through hole, which will cause the product to be unable to escape the cavity after being formed in the mold, and the product production is difficult. ; Second, when the product with a larger ...

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Problems solved by technology

There are many products with large through-holes in the structure, such as some automotive parts. For the production of such products by die-casting, there are mainly two technical difficulties in the following aspects: First, on the rear mold core of the rear template of the die-casting mold It is impossible to place enough thimbles for ejecting the product. At the same time, the product forms a large tight force on the insert pin at the position of the through hole, which will cause the product to be unable to escape the cavity after being formed in the mold, and the production of the product is difficult. ; Second, when die-casting a product with a larger through hole, it is necessary to set an insert pin in the position of the through hole to ensure the formation of the through hole of the product, but the setting of the insert pin is easy to cause the cooling water to fail during the die-casting process. When reaching the position of the insert pin, the local temperature of the insert pin is too high, causing the die-casting material to stick to the insert pin, resulting in a lack of material in the formed product. At the same time, the insert is also easy to break due to the high temperature of the insert pin. Moreover, the position where the temperature of the inserting needle is too high can easily cause shrinkage cavities and pores in the formed product, which directly affects the air tightness of the formed product, resulting in defective products.

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