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“极限与配合”是一项重要的互换性基础标准。它是保证零部件互换与配套、组织专业化生产不可缺少的技术措施,直接影响着产品的精度、性能和使用寿命,是评定产品质量的重要技术指标。1 公差制的历史1.1 1959年以前我国采用的是前苏联OCT公差制。 OCT公差制中,分子“A”代表基孔制;分母“B”代表基轴制;并且分静、过渡、动三种配合种类。静配合分热配合(P)、压配合(P)、轻压配合()三种;
“Limit and cooperation ” is an important basis for interchangeability standards. It is an indispensable technical measure to ensure the interchangeability of parts and components and the organization of specialized production. It directly affects the accuracy, performance and service life of the products, and is an important technical index for the assessment of product quality. 1 History of Tolerance System 1.1 Before 1959 our country adopted the OCT tolerance system of the former Soviet Union. OCT tolerance system, the molecular “A ” represents the base hole system; denominator “B ” represents the base axis system; and static, transition, moving three kinds of cooperation. Static with the heat with the (P), with the pressure (P), with light pressure () three;