产品包括：螺栓、螺钉、螺柱、U型螺栓、预装配的螺钉和垫片组件以及与预装配组件一样加工的无垫圈产品。
Products included are bolts, screws, studs, U-bolts, preassembled screw and washer assemblies (sems), and products manufactured the same as sems except without washer.
在此基础上，阐述协同数字化预装配技术的概念。
Then the concepts of collaborative digital pre-assembly techniques are presented.
协同虚拟装配是借助于网络对产品进行数字化预装配，它是敏捷化设计与制造的基础。
The cooperative virtual assembly is a kind of pre assembly for product in digital mode by network, and a basis of agile design and manufacture.
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