看板试图通过确保上游阶段只生产下游阶段所需的零件，以达到在不同阶段之间最小化WIP(未完成任务)，或者存货清单的目的。
Kanban's aim is to minimize WIP (Work-In-Process), or inventory, between processes by making sure that the upstream process produces parts only if its downstream process needs it.
但油淬情况就不是如此，因为油淬时在淬火临界阶段零件表面的温度可能仍然很高。
This is not true in oil quenching, when the surface temperature may be high during the critical stages of quenching.
偏差模拟技术已经用于在设计阶段对这些不确定因素进行预测，但是基于零件刚性体假设的偏差分析通常过高估计了装配偏差。
Variation simulation analysis has been used in the design stage to predict such uncertainties, but variation analysis based on rigid body assumptions usually overestimates the assembly variations.
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