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中文摘要：
着眼于产品层次的反求设计,基于功能表面组织了产品-零件-功能表面3层的精度模型.由三维重构模型反求出产品的精度信息模型,进而实现产品的精度设计.具体介绍了精度重构的实现步骤并以活塞夹具为例进行了验证.
英文摘要：
Aiming at the reverse design at product level, a functional surface-based tri-layer precision model of product--part--functional surface is proposed. The products＇ precision models are derived reversely from their 3D models so that the precision design of the products can be achieved. The implementation process of the precision reconstruction is elaborated and a piston fixture is presented as an example for validation.
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