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研究机械加工工艺过程尺寸链中的二环尺寸链，强调其存在、意义和地位。结合实例介绍求解工艺尺寸及其公差的基本思路；提出了二环尺寸链是确定并联关系机械加工工艺过程尺寸链中工序尺寸偏差的重要决定因素。提出修改传统的“工艺尺寸链”提法的建议。
To study the ring size chain in the dimension chain of machining process emphasizes its existence, significance and position. The basic idea of solving the process dimension and its tolerance is introduced with examples. The second dimension dimension chain is the important decisive factor to determine the process dimension deviation in the dimension chain of the machining process. Proposed to amend the traditional “process size chain” proposal.