扣件參數化設計及成形負荷快速評估系統

Parametric Design and Forging Load Prediction System for Fasteners

吳國鼎 ； 張婉琪 ； 許進忠 ； 余征諴

《機械工業雜誌》 441期 (2019/12) Pp. 37-42

摘要

本文提出扣件多道次製程設計及成形負荷預估方法，以快速評估產品成形負荷並提供成形曲線以做為調模參考。經由上界限法與厚壁圓環理論建立扣件成形負荷及模具應力預測，依據不同螺栓類產品幾何參數，自動產生標準成形製程並比較各道次負荷，由模具應力預估進行應力環最佳干涉量設計。以M6螺栓鍛造為例，經由FEM分析比較負荷估算誤差皆小於10%，並可快速預測各道次成形負荷及最佳應力環設計參數，可提供適當的機台選用參考，本系統可提供設計工程師快速評估製程設計，累積成形設計經驗，縮短設計的時程，提升產品開發速度。

關鍵字

快速評估系統 ； 上界限法 ； 厚壁園環理論

並列摘要

Methods of the multi-pass forming process design and forging load prediction are proposed in this paper to predict the forming load and to provide load curve as die adjustment for fastener industry. The forming load and the die stress analysis were generated via the upper bound method and the thick-walled cylinder theory, respectively. The standard forming process and load predictions were generated automatically according to the specified bolt geometry, and the optimum interference amount of the compression ring was calculated. A M6 bolt was taken to present the proposed system. The comparison of the load predictions with the FEM simulation results showed 10% deviation which is good enough for industry applications to estimate load requirement in the compression ring design. The proposed methods and the developed system were capable of helping engineers to evaluate new process design, build up forming experience, and shorten the product development time.

並列關鍵字

Fast evaluation system ； Upper bound theory ； Thick wall cylinders theory