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我厂生产的摩托车配件及微型车气门,对气门杆部外圆直径加工完毕后,应进行整体软氮化处理.为了防止氮化前后杆部直径的变化,氮化前应对其杆部直径全检,并将原尺寸公差压缩,结合氮化胀缩规律,压缩进气门尺寸为(?)5.5_(-0.045)~(-0.035),排气门为(?)5.5_(-0.07)~(-0.06),实际公差为0.01mm.用千分尺测量,(因刻度小)眼易疲劳.检测速度极慢,又易出错,不适合我厂生产的发展.用气动量仪测量,将原公差放大5000倍,即50mm的宽度表示0.01mm,直观显目,避免了错检;并且该量仪效率高,一次同时能测气门杆部上两点或三点直径,检测速度比原来快8～10倍,较圆满地解决了这个课题.
I plant the production of motorcycle parts and mini-car valve, valve stem diameter after the completion of processing, should be the overall soft nitriding. In order to prevent the nitrification before and after the rod diameter changes before nitriding its rod diameter Full inspection, and the original size tolerance compression, combined with the law of nitrogen expansion and contraction, compressed intake valve size 5.5 (-0.045) -0.035, the exhaust valve 5.5 (0.07 ) ~ (-0.06), the actual tolerance of 0.01mm. Measured with a micrometer, (due to small scale) eye fatigue. Detection speed is extremely slow, and easy to error, not suitable for the development of our factory production. 5000mm magnification of the original tolerance, which means that the width of 50mm 0.01mm, intuitive and obvious, to avoid misjudging; and the high efficiency of the instrument, one at the same time be able to measure the valve stem on two or three points diameter, the detection speed faster than the original 8 to 10 times, a more satisfactory solution to this issue.