Production process for curled type decorative tail tube

Abstract

The invention provides a production process for a curled type decorative tail tube. The production process comprises the following steps: (1) punching a sheet into a needed shape; (2) bending the sheet obtained in the step (1) into a tubular shape; (3) welding the two ends, which are in lap joint after being bent into the tubular shapes, of the sheet, thereby obtaining a pre-formed tubular product; (4) hydraulically expanding for enabling the pre-formed tubular product obtained in the step (3) to precisely form a needed outer contour; (5) bending the mouth part of the pre-formed tubular product obtained in the step (4) to be semi-circular through an elbow mould; and (6) reshaping and flaring the pre-formed tubular product obtained in the step (5) for enabling the tubular product to form aneeded shape. Manufacturing for the curled type decorative tail tube is accomplished through dropping, bending, straight seam welding, process angle punching, expanding, bending, head reshaping, primary expanding and secondary expanding, so that multi-time drawing process treatment for the sheet is not needed, and the operation process, compared with a multi-time drawing process, is greatly simplified, and therefore, precision controllability is improved, and a material utilization rate is increased.

Description

technical field [0001] The invention relates to a manufacturing process of auto parts, in particular to a production process of a curled decorative tail pipe. Background technique [0002] The decorative tail pipe of the car, that is, the tail throat of the car, is installed at the end of the exhaust pipe of the car, and has the functions of decoration and noise reduction. Since the decorative tail pipe of the car is used at the end of the exhaust pipe, it is usually directly visible to the user. In order to achieve a more beautiful and rounded decorative effect, a circle of crimping treatment is often performed on the opening of the tail pipe, and the crimping treatment is also beneficial to the Reduce exhaust emission noise. However, the crimping process of the decorative tail pipe is relatively complicated. Generally, a tubular shape is formed first, and then the tubular mouth is crimped. Traditionally, the crimping process requires the use of sheet material for multiple...

AI Technical Summary

Problems solved by technology

However, the curling molding process of the decorative tailpipe is more complicated. Generally, the tube is formed first and then the tubular mouth is curled. Traditionally, the curling molding process requires multiple drawing, shaping, trimming, punching, shaping, and flanging of the sheet material. And other processes, especially in the deep drawing process, due to the limitation of the deep drawing height, multiple deep drawing is often used, and its precision is difficult to control accurately. It can be seen that the traditional process is complex in forming, difficult in forming, and low in material utilization.

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