Method for processing reducer pipe by integral cold drawing molding

Abstract

The invention provides a method for processing a reducer pipe by integral cold drawing molding. Firstly, a small section of process pipe is formed on one end of a pipe blank (2) by the mode of extrusion or pruning, and the pipe blank (2) on which the process pipe is produced is arranged in concentric holes of a supporting sleeve (4) and a stretching die (3) provided with a stretching transition face; secondly, a cylindrical mandrel (1) which is prepared beforehand is arranged in the process pipe, and the process pipe thereof is gripped on the gripping head of a machine tool; and thirdly, the process pipe is moved along with the gripping head of the machine tool in the movement direction, and then can be formed by stretching. The reducer pipe produced by the method has the advantages of smooth surface, no flash burr, favorable airtightness and electrical conductivity, stable and reliable stretching, high efficiency and easy control of reducing size, and avoids the disadvantages of hard guarantee of straightness and coaxiality of parts, low production efficiency, complex connection structure, high production cost, poor connection airtightness and electrical conductivity, and the like of the common method for processing the reducer pipe. The method is suitable for processing the controllable stoke reducer pipe and can meet the special requirements of measurement products on fuel oil for aviation and motor cars.

Description

technical field [0001] The invention relates to a processing method for a non-cutting stretch forming reducing pipe. Background technique [0002] The reducing tube is an important part of the fuel oil level measuring instrument of the aircraft and the vehicle. Therefore, the diameter of the reducer, the length of the reducer and the accuracy of manufacturing are strictly required. At present, it is generally difficult to meet the requirements in the manufacturing methods of welding processing and mechanical connection processing of transition joints to process reducing pipes. This is because the reduced diameter pipes processed by welding are easily deformed by heat during welding, and are easy to be welded through. Moreover, the straightness and coaxiality of the parts are difficult to guarantee. After welding, the surface of the reducing pipe, especially the inner surface, is difficult to grind. Whether it is single piece or mass production, the production efficiency ...

AI Technical Summary

Problems solved by technology

Whether it is a single piece or mass production, the production efficiency is very low, and the yield is not high

[0003] However, the reducing pipe mechanically connected by transition joints not only has a complicated connection structure and high manufacturing cost, but also has poor connection sealing and electrical conductivity.

The assembled variable diameter tube has poor electrical performance, such as the capacitance value is difficult to adjust

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