用板牙加工小直径螺柱是一项较困难的工作,尤其是螺柱的直径在3mm以下,螺纹长度大于30mm时,加工起来就更困难。起初,我厂工人把板牙装在普通的板牙架上加工M3×50的接线螺柱,加工出的螺柱有40％不合格。有的直径一段粗,一段细;有的半边有螺纹,半边没有螺纹,达不到图样要求。后来我们采用了如图所示的活动板牙架,加工起来方便、可靠,提高了效率,保证了质量。 Machining small diameter studs with a die is a more difficult task, especially when the stud diameter is under 3 mm and the thread length is greater than 30 mm, making machining more difficult. At first, the factory workers put the board teeth in the ordinary plate frame processing M3 × 50 studs, processed studs 40% failed. Some diameter of a rough, a thin section; some half of the thread, half no thread, can not meet the requirements of the drawings. Later, we use the activities shown in the tooth plate frame, processing up convenient, reliable, improve efficiency and ensure the quality.