我厂生产的活塞,其内槽直径的精度较高(四级),过去我们一直使用普通的弹簧卡钳和内槽卡尺进行测量。因为测量不准确,经常出现返工、报废的情况,降低了产品质量,影响了生产任务的完成。通常生产中使用的内径靠表,虽然测量精度高,但它的测量头伸缩量小,不能通过内孔伸入内槽进行测量;普通的弹簧卡钳虽然卡脚伸缩量大,能伸入内槽测量,但测量精度低。二者之间,恰有相反的长短之处。而本文介绍的测量活塞内槽的弹簧卡钳,则同时具有上述 The pistons I produced in our factory have higher accuracy of the inner groove diameter (Grade IV). In the past, we used the ordinary spring calipers and inner groove calipers for measurement. Because of inaccurate measurements, rework and scrapping often occur, reducing product quality and affecting the completion of production tasks. Usually used in the production of the inner diameter of the table, although the measurement accuracy, but its measuring head retractable small, can not be measured through the inner hole into the inner groove; ordinary spring caliper card feet retractable, can be inserted into the inner groove Measurement, but the measurement accuracy is low. Between the two, exactly the opposite length. While the spring caliper for measuring the inner groove of a piston described in this article has both of the above