Central running-gate mould cavity of extruding mould

Abstract

A central sprue cavity of pressig die is composed of raw material staying tray, sprue cup, and internal sprue consisting of upper segment whose cross-section is gradually decreased and lower segment whose cross-section is gradually increased. Its advantages are low pressure to die and die locking force, and easy breaking off of prue on demoulding.

Description

technical field [0001] The invention relates to the technical field of extrusion dies in metal casting, in particular to a gate cavity for supplying molten metal by pressing metal into the casting mold with high pressure during extrusion die casting. Background technique [0002] Compared with ordinary die-casting die, the die-casting product has the characteristics of smooth surface and dense texture, and can be used to process products such as automobile air-conditioning parts. The mouth is on the side of the product. Although it is easier for the product and the gate to come out of the mold, due to the difficulty of exhausting and pressure transmission, bubbles and internal leakage are often generated during the T6 treatment. In the product center, feeding from below can change the above situation; but the gate is in the product center, if the cylindrical gate of the prior art is used, the following problems will occur: First, the pressure loss is large, and the applied h...

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Problems solved by technology

[0002] Compared with products produced by ordinary die-casting dies, die-casting products have a smoother surface and a denser texture. They can be used to process automotive air-conditioning parts and other products. If molten metal enters from the side of the product, it can be cast The gate is on the side of the product. Although the product and the gate are easy to come out of the mold, due to the difficulty of exhaust and pressure transmission, bubbles are often generated during T6 processing, and internal leakage and other phenomena occur; If the gate is in the center of the product, if the gate is in the center of the product, if the cylindrical gate of the prior art is used, the following problems will occur: First, the pressure loss is large, and most of the applied high pressure rushes towards the formwork , cannot be smoothly transferred into the mold cavity; second, a large clamping force is required, otherwise the pressure rushing to the template is likely to push the template away; third, it is difficult to break the gate when demoulding; especially for automobile air conditioners Products such as scroll discs are die-cast with cylindrical gates, and the technical performance of the products often fails to meet the requirements.

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