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21—4N材质气门车削性能较差,用YW类硬质合金刀头加工,与加工4Cr9Si2材质相比,效率低,刀具消耗量大,废品率高,从而给大批量生产带来一定困难。最近,我们对气门盘部端面采用了磨削加工,收到了较好的效果。 在M7475磨床上采用立式装夹（如图示）。磁盘上面加一底盘1,其上可安装九个夹具体2,每个夹具体上装夹八只气门,所以一次可磨削七十二只气门。以气门小端面定位,定位螺栓4可调整高低,调好后用锁母3紧固。气门杆部外圆紧贴住Ⅴ型块11,Ⅴ型面对夹具体2的垂直度将保证磨削后的气门盘部锥面对气门杆部的跳动量。凸轮手柄8通过垫圈7、压板6以及装在压板槽里摆块5压紧气门。摆块与气门之间的间隙由螺母12调整。当凸轮手柄松开以后,为了使摆块5脱开气门,在拉杆13上可加一弹簧。
21-4N material valve turning performance is poor, with YW carbide cutter head processing, and processing 4Cr9Si2 material compared to low efficiency, tool consumption, high reject rate, which brings some difficulties for mass production. Recently, we used the grinding of the valve plate end face, and received good results. Vertical clamping on M7475 grinding machine (pictured). Add a disk above the chassis 1, which can be mounted on the nine clamp body 2, each clamping body mounted on eight valve, so one can seventy-two valve. To valve small end positioning, positioning bolts 4 can be adjusted high and low, adjusted with a lock mother 3 fastening. Valve rod outer circle close to the Ⅴ block 11, Ⅴ vertical plane clamp body 2 will ensure that the trapezoidal valve disc after grinding Department of the amount of beating the valve stem. The cam handle 8 presses the valve through the washer 7, the pressure plate 6 and the pendulum mass 5 installed in the pressure plate groove. The gap between the pendulum block and the valve is adjusted by the nut 12. After the cam handle is released, a spring may be added to the pull rod 13 in order to release the swing block 5 from the valve.