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在加工棒材拉力试样中,需频繁松紧三爪卡盘,操作人员劳动强度大,长期使用三爪卡盘磨损严重,且效率低,成本高.经多年实践,设计出一种简便,易操作的夹具,见附图.可减轻劳动强度,降低三爪卡盘损耗,拉力试样加工效率提高,操作时间缩短.夹具的前部是内圆锥形定位孔,(锥度6°～8°)中心有一弹簧顶着中心顶头,专用于加工棒材拉力试样.使用时,先将夹具夹在车头的三爪卡盘上,试样一端对准夹具的中心顶尖,另一端由车床尾座中心顶尖顶紧,使试样在内圆锥形定位受力固定,此时弹簧处于受压状态,保证试样在加工中正常切削,待试样加工完毕,松开车床尾座中心顶尖,使弹簧复原,试样被自动顶出.
In the processing of bar tensile specimens, the need to frequently elastic three-jaw chuck, the operator labor-intensive, long-term use of three-jaw chuck wear and tear, and low efficiency, high cost. After many years of practice, to design a simple, easy Operation of the fixture, see the attached map. Reduce labor intensity and reduce the loss of three jaws, pull the sample processing efficiency, shorten the operation time.At the front of the fixture is the conical positioning hole, (taper 6 ° ~ 8 °) The center has a spring against the center of the head, dedicated to the processing of bar tensile specimens.Use, the first fixture in the front of the three-jaw chuck, the specimen at one end of the fixture center of the center, the other end by the lathe tailstock center Top tight, so that the specimen within the conical positioning force fixed, then the spring is under pressure to ensure that the sample in the normal machining, processing until the sample is completed, the center of the tailstock center is released, the spring return , The sample is automatically pushed out.