机械制图标准件和常用件基础知识概述
标准件和常用件的定义
1.标准件:就是国家标准将其型式、结构、材料、尺寸、精度及画法等均予以标准化的零件。如螺栓、双头螺柱、螺钉、螺母、垫圈,以及键、销、轴承等,由专门厂家进行大批量生产。
2.常用件:国家标准对其部分结构及尺寸参数进行了标准化的零件,如齿轮、弹簧等。
69页PPT内容介绍标准件和常用件基础知识
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