In the fourth chapter, the automatic generation theory of the dimension chain based on assemble drawing is put forward.
第四章：提出了基于装配图约束关系的尺寸链自动生成原理。
The drawing cylinder of C7620 is very difficult to assemble and disassemble; the oil seal of the drawing cylinder is easy to wear down faster and causes leakage.
C7620车床的拉紧油缸在装配和拆卸时较为困难，密封圈磨损较快，且漏油现象严重。
Modeling steps: confirm design scheme, model parts, assemble part, edit unit store and make schedule drawing.
造型过程含确定设计方案、零件造型、零件装配、编辑零件库、生成工程图等步骤。
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