本研究旨在開發電腦輔助設計程式，以簡化手工方式推演板金件容差表複雜的設計工作。透過系統提供之人機介面，設計工程師可在系統中產生設計簡圖，擷取板金元件原始藍圖中之特徵與尺度。而圖面上之尺寸容差與幾何容差的標註，使用者則可利用系統中附屬之轉換與計算的功能建立容差之約束條件。此外系統中內建最差法及統計法兩種法則作為容差分析的演算模組，以協助設計工程師對板金件之施工尺寸與製程容差做適度地分配。因為減少了人為因素導致計算誤差，板金製程的規劃將可有效的進行設計品質亦可確保。

The objective of this research is to develop a computer aided design program so that the tolerance charting of sheet metals will be simplified. The system offers a friendly interface and users can complete his design task step by step. First, a user collects the necessary data such as features and dimensions from a blueprint and input them to the system. The software can provide schematic drawings of the sheet metal part to the user immediately. Then, a tolerance module helps to the user converting the size tolerances and geometric tolerances on the blueprint into constraints in the cad model. Two tolerance analysis methods, the worst case approach and statistical approaches have been included in the system. The uses can choose either one to perform tolerance accumulation on a resultant dimension or to allocate process tolerances for each bending process. With the assistance of computer aid design, human errors can be decreased but engineer’s productivity will be increased.

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