长春第一汽车制造厂生产的汽车发动机,活塞销和活塞、连杆进行分组装配,其外径尺寸共分六组,每组间隔仅0.0025毫米,精度要求较高。原使用苏联设计的检测仪器,示值不清,而且每个工件在检测三个截面尺寸时,要来回移动三次,工作效率低,误差大,仪器的结构复杂,不易调整。该厂工具分厂采用自制的水柱式高压气动仪等制成的活塞销多尺寸测量装 Changchun First Automobile Works production of automotive engines, piston pin and piston, connecting rod assembly, the outer diameter size is divided into six groups, each interval of only 0.0025 mm, higher accuracy. The original use of the Soviet-designed testing instruments, indicating the value is not clear, and each workpiece in the detection of three cross-sectional size, to move back and forth three times, low efficiency, error, the instrument’s complex structure is not easy to adjust. The plant tool factory using self-made high-pressure water pressure pneumatic piston piston pin made of multi-size measurement equipment