Development of computer aided process planning system for plate bending by line-heating. Report 4: Decision making on heating conditions, location and direction

Abstract

The plate bending process is considered as a process to form three-dimensional shapes by introducing the permanent strain (inherent strain) into a plate through proper means. It has been shown that it is very important to utilize both inplane and bending inherent strains for effective bending. The inherent strain necessary to produce the final shape to be formed and the relation between the heating condition and inherent strain created by single heating line in the previous work have been studied. Although the general idea of generating process plan or heating instructions was proposed, the detail was not discussed. Therefore, methods to generate the information on where, in which direction and how to heat are discussed in this report. Their effectiveness are examined through numerical examples.

板曲げプロセスは、適当な手段を通じて板に永久歪(固有歪)を導入することにより、3次元形状に成形するプロセスと考えられる。有効な曲げには、面内歪および曲げ固有歪の両方を用いることが極めて重要であることが示されている。著者は、前報において、最終形状に成形するに必要な固有歪および加熱条件と単一加熱ラインによって創られた固有歪との関係を研究した。プロセスプラン構成あるいは加熱方式の一般的理念は提案したが、詳細は論じなかった。従って、何処で、どの方向へ、そしてどのように加熱するかに関する情報構成法を本報では論じた。その有効性の検証は数値例で行った。