Zoo Zoo Diesel Roj Injector Nozzle DN4PD57 rau Denso Toyota Cav Qhov

Kev tshuaj xyuas yog vim li cas lub injector nozzle daig nyob rau hauv lub injectors (Part 2)

2.2 Nto roughness thiab hardness ntsuas tau Qhov saum npoo roughness ntawm rab koob valve yog ntsuas thiab qhov yuav tsum tau roughness saum npoo ntawm rab koob valve yog 61HRC ~ 65HRC rau qhov yuav tsum tau hardness nto. Lub roughness ntawm lub koob valve nrog steel stamp tooj HHM yog Ra0.03 Rt0.34, thiab lub hardness saum npoo yog 60.4HRC ~ 60.7HRC; Lub koob valve nrog steel stamp tooj HD yog Ra0.02, Rt0.37, thiab qhov tawv tawv yog 62.3HRC. Qhov roughness thiab hardness ntawm ob rab koob li qub xa mus rau kev soj ntsuam tag nrho ua tau raws li cov qauv tsim. Tom qab lub nozzle tau dissected, lub puab qhov roughness yog ntsuas. Lub puab qhov roughness yuav tsum tau ntawm lub nozzle yog 0.05Rt0.8. Valve Ra0.07～1.16, Rt0.82～1.79. Lub puab qhov roughness ntawm ob lub nozzles xa mus rau kev soj ntsuam tsis tau raws li qhov yuav tsum tau tsim.

2.3 Surface hardness ntsuas thiab metallographic tsom xam Cov saum npoo hardness ntawm rab koob valve yuav tsum yog 61HRC-65HRC, tsis pub dawb bainite thiab cov residual austenite tsis pub tshaj 5%. Lub hardness ntawm lub koob valve nrog thawj tus naj npawb HHM yog 62.9HRC ~ 63.6HRC, cov nplej loj yog 10, thiab qib ntawm superheat yog 2; lub hardness ntawm rab koob valve nrog tus thawj steel stamp tus naj npawb HD yog 62.4HRC ~ 63.4HRC, lub grain loj yog 9 thiab lub degree ntawm superheat yog 2. Lub hardness ntawm ob rab koob li qub tag nrho raws li cov qauv tsim.