| 摘要 |
A manufacturing process for a single-block fuel injection rail of a type wherein said rail comprises at least one rectilinear hollow main tube to which are joined rigidly at least one fuel intake tip ; at least one and generally several injector intakes , and rail fastening means , the improvement comprising: heating an aluminium alloy billet to a temperature in the range from about 430.degree.C to about 460.degree.C and, while in a heated condition, hot die forming in a die made of two parts , said hot die-forming comprising extruding said billet through an intermediate of said die so as to provide said billet with a full primary shape which corresponds to an outer shape of said rail to be made and which primary shape has one or several buckles of an extruded aluminium alloy, cooling said primary form to an ambient temperature level; cold machining said primary form , said cold machining comprising: cutting to an exact axial size required; removing at least one superfluous area of the extrusion buckles ; retaining at least one functional area from said extension buckles in existence so as to obtain a secondary full form corresponding partly to an outer form of the rail to be made; |
