Mold for machining internal thread of plastic part and pulling core

Abstract

The invention discloses a mold for machining an internal thread of a plastic part and pulling a core. The mold comprises a fixed mold body, a movable mold body and an oil cylinder motor, a first motorgear is fixed to an output shaft of the oil cylinder motor, a transmission mechanism is arranged in the movable mold body and comprises a rotating shaft, a first insert gear and n second insert gears, the first insert gear is fixed to one end of the rotating shaft, a second motor gear is fixed to the other end of the rotating shaft, an anti-strain mechanism is further arranged in the movable moldbody and comprises n anti-rotation inserts, a hole site insert is arranged in each anti-rotation insert, one end of each hole site insert is fixed to the corresponding second insert gear, a thread insert is fixed to the other end of each hole site insert, the thread inserts penetrate through a mold core to be movably arranged in a mold cavity to be used for shaping the plastic part with the internal thread, and the rotating shaft is driven by driving force provided by the oil cylinder motor to rotate so as to drive the thread inserts to rotate. The mold has the advantages that strain and burn-out cannot be caused, and the generation of burrs of the mold is avoided; and a thread head and a thread tail of the thread are located at the unified position through a core-in limiting mechanism.

Description

technical field [0001] The invention relates to the technical field of plastic molds, in particular to a mold for processing internal threads and core pulling of plastic parts. Background technique [0002] Plastic molding is the most common method in plastic processing. As one of the tools for plastic molding, plastic injection molds affect the quality, output and cost of products in terms of quality, precision manufacturing cycle and production efficiency of the injection process. The upgrading of products has higher requirements on the level of mold design. Great progress has been made in precision plastic molds, and the plastic parts produced by the molds are slowly maturing. [0003] At present, there are various types of internal thread release in the mold industry. The main structure basically includes a strong release structure, a motor-driven structure, a manually twisted thread insert structure, an oil cylinder rotation structure, and a sloping top structure. Gen...

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Problems solved by technology

[0004] However, there are more or less defects in the existing internal thread demoulding structure, such as the following points: 1. In the process of driving the automatic demoulding push plate by the oil cylinder, due to the large friction force, it is easy to be injured and burned. 2. Since there is no limit on the circumference of the plastic product on the mold, when the plastic part is separated from the mold, the rotation of the mold will cause the plastic product to follow the rotation, resulting in that the demolded product cannot reach Standard requirements; 3. Threaded inserts do not have a core-entry limit structure, and the thread head and tail of the processed product cannot always be in the same position

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