Shaping technology and shaping device for large-diameter PE (poly ethylene) reduced tee joint branch pipe

Abstract

The invention discloses a shaping technology and a shaping device for a large-diameter PE (poly ethylene) reduced tee joint branch pipe. The shaping technology comprises the following steps of: drilling a calculated small hole (2) on a specified position of a thick-wall PE piping; fixing the piping with the opening on a hoop clamping device formed by two semicircles; heating outer wall on the opened position by a heater; quickly pushing the heated piping to the right to a right semicircle die by a hydraulic cylinder, and tightly supporting; putting a pull head with a cooling device into the small hole, wherein the front end of the pull head is a small shaft, and the rear edge is expanded in the taper shape; enabling the small shaft on the front end of the pull head to pass through the small hole; clamping the small shaft by the chuck of a drawing device; applying tensile force; carrying out turnup and chambering the small hole; stopping drawing after the pull head is pulled to the position, and keeping stationary; introducing cool water to cool the inside and the outside of the shaped branch pipe; after cooling and shaping, returning the shaped piping to the left position; taking down the shaped reduced tee; and taking out the shaped pull head.

Description

technical field [0001] The invention generally relates to plastic processing, in particular to a processing method for a large-diameter PE reducing tee branch pipe. technical background [0002] At present, there is no other processing method for the large-diameter PE reducing tee branch except for injection molding to meet the requirements. However, the small amount of branch pipes processed by expensive large-scale injection molding machines, coupled with high mold costs, the production cost is dozens of times that of the product, and cannot be sold in the market. On the other hand, injection molding can only be produced with PE80 grade raw materials, while PE100 has good raw material performance, but its fluidity is poor, and it needs a more demanding injection molding machine to complete. Due to the investment and cost constraints of injection molding, the reducing tee branch pipes of large-diameter plastic pipe fittings can only be processed by other methods, such as w...

AI Technical Summary

Problems solved by technology

There are still some deficiencies in the technology disclosed in this application, including ① the opening of small holes is not calculated, resulting in insufficient branch pipe material and insufficient wall thickness

②Using external force to act on the die head, the external force used is a jack, because the space inside the tube is too small, the operation is difficult, and the efficiency of the manual jack is slow, the temperature drops quickly, and continuous operation cannot be performed

③Because the pipe is not fixed, the pipe is easily deformed by the force of the jack, resulting in an ellipse, which is difficult to restore after cooling

④ The centering is not good, so the wall thickness of the branch pipes formed is uneven and the length is different

⑤ Difficult to form serial production

⑥The product is difficult to produce piece by piece, and the quality is the same

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