Lug type tunnel gate for plastic pipefitting die

Abstract

The invention relates to a lug type tunnel gate for a plastic pipefitting die. The tunnel gate comprises a die cavity insert and a core insert. A runner hole is formed in the cavity insert. The tunnel gate is characterized in that a lug is arranged on a parting line of the cavity insert close to the runner hole, a cavity runner is formed between the lug and the runner hole, a tunnel gate is arranged in the lug, a core runner and a groove are formed in the corresponding core insert, the lug is matched with the groove, the cavity runner is matched with the core runner, and the tunnel gate communicates to the cavity runner (6) and the core runner. The tunnel gate is primarily characterized in that the lug is arranged on the parting line of the cavity insert, and the tunnel gate is arranged in the lug. The tunnel gate has the advantages that when a flue inlet sprue is located on the parting line of the die, a melted plastic raw material entering flow toward two sides (a cavity side and a core side) uniformly and then is gathered together, so that a joint is welded uniformly, the weld marks are few, the pipefitting is attractive in appearance and the product quality and grade are improved.

Description

technical field [0001] The invention relates to a convex block type latent gate of a plastic pipe fitting mold, which belongs to the field of injection molds. Background technique [0002] The injection mold is used to produce plastic pipe fittings. According to the product structure and shape analysis, the parting line of the plastic pipe fitting mold is set in the middle of the plastic pipe fittings, and the injection gate is set below the parting line. However, in actual production, since the injection gate is below the parting line, the molten plastic raw material flows into the mold cavity from both sides after being injected from the gate. As a result, the two strands of plastic raw material cannot reach the intersection position at the same time. A certain temperature difference will easily produce weld marks during welding, which will affect the appearance of the product. Contents of the invention [0003] The purpose of the present invention is to overcome the di...

AI Technical Summary

Problems solved by technology

However, in actual production, since the injection gate is below the parting line, the molten plastic raw material flows into the mold cavity from both sides after being injected from the gate. As a result, the two strands of plastic raw material cannot reach the intersection position at the same time. A certain temperature difference will easily produce weld marks during welding, which will affect the appearance of the product

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