Patent ID: 9005379
Filing Date: 2015-04-14
Classification: B21K,F02M

Abstract:
1. A process for producing a pipe comprising a first end configured to be installed on a seat connected to an injector pump, the pipe configured to supply fuel to an engine, the method comprising the steps of: prearranging a pipe made of stainless steel, wherein the stainless steel comprises carbides, and the pipe is free of welding spots and welding lines; subsequent to prearranging the pipe, hot-pressing the first end or at both ends of the pipe, wherein each end of said pipe subjected to the hot-pressing has a frustoconical end section, a cylindrical intermediate section with outer diameter greater than said frustoconical end section, and another frustoconical section connecting said cylindrical intermediate section to the remainder of the non-hot pressed pipe; subsequent to the hot-pressing of the pipe, subjecting said first end or both ends of said pipe to a heat induction treatment, wherein the carbides contained in the stainless steel are solutionized into solution during said heat induction treatment; and subsequent to the heat induction treatment, cooling said pipe, wherein the heat induction treatment is performed such that the frustoconical end portion is softened, returning the frustoconical end portion to the hardness prior to the hot pressing operation.