Straight pipe fine-drawing process

Abstract

The invention relates to a straight pipe fine-drawing process. The process comprises the steps of firstly, part preparing, wherein a straight pipe and a core bar are prepared, the core bar can penetrate into the straight pipe, and one end of the core bar is provided with a limiting end cap capable of preventing the straight pipe from falling out of the end; secondly, preheating, wherein the heating temperature of a heating mechanism is set to be 158+/-10 DEG C; thirdly, heating, wherein the core bar is inserted into the nylon straight pipe in a penetrating manner, it is ensured that the end face of the straight pipe abuts against the end cap of the core bar, the fixed end of the straight pipe is fixed through a clamping mechanism, and the heating mechanism is used for heating the part, tobe stretched, of the straight pipe; fourthly, stretching, wherein the straight pipe is axially stretched through the stretching mechanism, and the straight pipe is locally reduced on the heating portion; fifthly, after stretching, cooling of the straight pipe; and sixthly, taking down the straight pipe from the clamping mechanism, pulling out the core bar from the straight pipe, and after passingthrough examination, obtaining the straight pipe locally reduced. Rapid reducing of the nylon straight pipe is achieved, the principle is simple, design is reasonable, and reducing operation is precise and efficient.

Description

technical field [0001] The invention relates to a thinning process, in particular to a thinning process for a straight nylon tube. Background technique [0002] China's automobile industry is developing rapidly, and the requirements for auto parts have also been greatly improved. Nylon (polyamide) pipes for automobiles have been widely used. In the process of automobile assembly and production, nylon pipes need to be equipped with valves or joints to realize pipeline At the same time, it is necessary to develop valves or joints of corresponding specifications. At present, different brands and types of cars have their own specifications of nylon tubes, resulting in a lot of accessories for valves or joints. In order to match the pipeline design of customers, it is often necessary to Designing valves or fittings to match the piping specifications results in high costs and development risks for developing new specification valves or fittings. [0003] If the outer diameter of ...

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Problems solved by technology

[0002] China's automobile industry is developing rapidly, and the requirements for auto parts have also been greatly improved. Nylon (polyamide) pipes for automobiles have been widely used. In the process of automobile assembly and production, nylon pipes need to be equipped with valves or joints to realize pipeline At the same time, it is necessary to develop valves or joints of corresponding spe

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