Analysis of technical characteristics of common rail injector parts corresponding to grinding

The high pressure common rail injector works under high pressure, high temperature and high frequency response. The structure of the injector includes nozzle coupler, control valve coupler, orifice plate ball valve and control sleeve ( BOSCH structure) and many other pairs of precision parts. The mesoporous and sealed seating surfaces of these precision parts are usually processed by high-precision grinding to meet the technical requirements, which brings great challenges to the grinding process technology of precision parts.

Analysis of technical characteristics of common rail injector parts corresponding to grinding

1. High surface performance requirements of parts

The mesoporous and sealed seat surfaces of the common-pole injector precision parts have good sliding and sealing properties under high temperature and high pressure conditions, which requires high geometric accuracy of parts and high wear resistance and high strength. High fatigue resistance. Generally, the roundness is required to be 0.5 μm or more, the cylindricity is 1 μm or more, and the surface roughness Ra is 0.008 mm or more. This poses a new challenge to the high-precision machining of surface residual stress, surface metamorphic layer and surface morphology of machined parts.

2. The application of new materials brings difficulties to the processing and manufacturing of common rail parts

Due to the high working pressure and high temperature, the high pressure common rail injector system places high demands on materials. High-temperature wear-resistant alloys such as tungsten, molybdenum, nickel, vanadium and chromium are used in large quantities, and high-strength composite materials are used. For example, needle valves are commonly used in 18CrNi8, 18CrNW, and orifice plates are made of W6M05Cr4V2. The application of these materials has triggered a new round of innovation and improvement in processing methods and equipment.

3. Technical characteristics of precision grinding of precision coupling parts in common rail system

Due to the high precision and complex materials of the common rail system precision parts, and the mass production of parts, this puts high requirements on the processing technology, key technology, abrasives and equipment, see Table 1.

Table 1 Common Rail System Parts Requirements

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