Method of manufacturing common rails,申请号GB20000003402-传众专利搜索

Method of manufacturing common rails

申请公布号：GB0003402(D0)

申请号：GB20000003402

申请日期：2000.02.14

申请公布日期：2000.04.05

申请人：

USUI KOKUSAI SANGYO KAISHA LIMITED

分类号：F16L41/02;B21C37/29;B21K3/00;F02M41/00;F02M55/02;F16L41/08

主分类号：F16L41/02

摘要：A method is provided for manufacturing common rails, such as a high-pressure fluid manifold or a block rail that may be use in an accumulator fluid injection system. The method includes providing a main tubular rail with a flow passage extending in an axial direction. A bottomed lower hole is formed generally transverse to the axial flow passage. A pressing force is applied to the bottomed lower hole to generate a residual compressive stress in a circumferential part of the end portion of the bottom hole. The bottom lower hole then is made to communicate with the flow passage in the main rail. Defects that may have been caused by the application of the pressing force then are cut off. The removal of the defects improves an internal pressure fatigue strength, achieves high durability and ensures freedom from leakage.