A kind of processing method of automobile exhaust pipe fittings

Abstract

The invention provides an automobile tail throat pipe machining method. The automobile tail throat pipe machining method comprises the steps of a) stamping a sheet material to obtain a sheet with opposite two sides which are straight sides with equal length and other two sides which are curved sides, wherein the length of one curved side is smaller than the length of the other curved side; b) forming a plurality of circular holes in the sheet; c) bending the sheet, enabling the two straight sides to be fit, and then welding the two straight sides together to form a cylinder to obtain a semi-finished product which is featured by that the port of one end is large, the port of the other end is small, the side surface is gapless and the section of the side surface in the direction from one port to the other port is a straight side; d) removing welding burrs, putting the semi-finished product into a mold with a product shape, closing the mold and extruding to obtain a finished product; wherein in the step a, the length of one curved side is equal to the perimeter of one port, and the length of the other curved side is equal to the perimeter of the other port. By adopting the method, the thickness at different positions of the pipe is comparatively uniform, the finished product is not easily destroyed and the product qualification rate is high.

Description

technical field [0001] The invention relates to a processing method for an automobile tail throat pipe fitting. Background technique [0002] The tailpipe of a car is a component installed at the tail end of the exhaust pipe of the car. In addition to preventing the deformation of the tail pipe of the car, it can also play the role of supercharging and turbulence, so that the exhaust pipe of the car can emit light to a certain extent. The sound becomes slightly softer and nicer, reducing the noise. [0003] The pipe fittings of automobile tail throat are generally small in diameter at the part connected to the exhaust pipe, while the diameter of the other end is relatively large. ladder tube. In the prior art, for this kind of automobile exhaust pipe fittings, a round pipe is generally used, and then the stretching process is used to stretch out the stepped pipes with different pipe diameters, and then the finished product is obtained by punching holes on the stepped pipes...

AI Technical Summary

Problems solved by technology

In the prior art, for this kind of automobile exhaust pipe fittings, a round pipe is generally used, and then the stretching process is used to stretch out the stepped pipes with different pipe diameters, and then the finished product is obtained by punching holes on the stepped pipes. Using this method, the stretched stepped pipe has different thicknesses due to different pipe diameters, and the thickness is uneven, and it is troublesome to punch holes in the pipe, and it is easy to be damaged, resulting in a low qualified rate of finished products.

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