A Back Extrusion Plane Forming Process for End Cone Parts of Automobile Exhaust System

Abstract

The present invention relates to the technical field of auto parts production and manufacturing, specifically a back-extrusion planar forming process for end cone parts of an automobile exhaust system, which is carried out in the following steps: Step 1: Determine the shape of the end cone parts to be produced Size, use the blanking die to punch out the outline of the product to form a blank; step 2: use the drawing die to stretch the blank into a semicircular semicircular blank; step 3: use the forming die to stamp the semicircular blank to form a forming blank; step 4: Use the reverse extrusion die to reversely extrude the forming blank out of the bottom plane to form a rough product; Step 5: Use the trimming die to cut off the excess edge material of the rough product to form an end cone part; the present invention uses a reverse extrusion process instead The flanging process is adopted, which reduces the process steps, compresses six sets of molds to five sets, and reduces the cost of the mold. Because there is no need for flanging, the bottom of the product is flat and does not stretch out, which improves the utilization rate of materials.

Description

technical field [0001] The invention relates to the technical field of auto parts production and manufacturing, in particular to a back-extrusion planar forming process for end cone parts of an auto exhaust system. Background technique [0002] The material of end cone products of automobile exhaust system is generally made of stainless steel. The material grades are generally 1.4828, 1.4509, 439, 441, etc. The common characteristics of these materials are medium and high-strength steel, with tensile strength ≥ 430, elongation strength ≥ 250, and elongation ≥ 18. The characteristics of the material determine that the material of this type of product has high hardness, is not easy to form, has large rebound, and is easy to crack. The steel requirements for the mold are high, so the existing production process is blanking, stretching, forming, trimming, flanging, and shaping, a total of 6 steps, such as figure 1 As shown, a total of 6 sets of molds are used for production, a...

AI Technical Summary

Problems solved by technology

There are high requirements for the steel of the mold, so the existing production process is blanking, stretching, forming, trimming, flanging, and shaping, a total of 6 steps, such as figure 1 As shown, a total of 6 sets of molds are used for production, and there are many processes, and because of the flanging process, the flanging size will be unstable, the bottom will be uneven, and the flanging die needs to use tungsten steel to achieve mass production, and the cost of the mold is high.

Images