三、镗铣类数控机床用工具系统标准化概况1.国外自动换刀机床用7:24圆锥工具柄部标准化现状自六十年代研制出加工中心机床以来,至七十年代末工业发达国家的数控化率已达到30～40%,但国际标准化组织(ISO)在这期间并未进行自动换刀机床用7:24圆锥工具柄部标准的起草工作,一些国家先后自行制订了有关柄部和柄部拉紧用拉钉的国家标准、协会标 Third, the boring and milling CNC machine tool system standardization profile 1. Foreign automatic tool change machine tool 7:24 conical tool handle standardization status Since the 1960s developed the machining center machine, to the late 1970s industrialized countries NC The rate has reached 30 ~ 40%, but the International Organization for Standardization (ISO) during this period did not carry out automatic tool changer 7:24 conical tool handle standard drafting work, some countries have formulated their own on the handle and handle Department of tension with pull the nail national standards, the Association standard