Patent ID: 9101971
Filing Date: 2015-08-11
Classification: B21D,B60K,F01N,Y10T

Abstract:
1. A method of manufacturing a tail trim of an exhaust pipe for a vehicle, the method comprising: forming a substantially tubular pipe section by a pipe forming process; forming a first tail trim assembly along the pipe section by a primary hydroforming process by injecting fluid into the pipe section at high pressure, the first tail assembly including first and second tail trim portions; performing a heat treatment process in the first tail trim assembly, wherein the performing of the heat treatment process includes forming a carbonized film along an inner surface of the first and second tail trim portions of the first tail trim assembly; forming a second tail trim assembly by a secondary hydroforming process by injecting fluid into the first tail trim assembly at high pressure; and performing at least one of cutting, deburring, and restriking to the second tail trim assembly.