一、前言 型材是飞行器、火车、汽车、雷达天线等的受力结构零件。其剖面形状以角材为主,此外尚有T形、U形以及其它形状的剖面。其外形有等曲率的,也有变曲率的。此类零件比较细长,相对弯曲半径较大。目前大部分工厂成形此类零件的机械化程度低,劳动强度大,生产率低。本文介绍此类零件的一 First, the foreword Profile aircraft, trains, cars, radar antenna and other components of the force structure. Its profile is mainly angle material, in addition there are T-shaped, U-shaped and other shapes of the cross-section. Its shape has equal curvature, but also variable curvature. Such parts are relatively slender, the relative bending radius larger. At present most of the factory forming such parts of the low degree of mechanization, labor-intensive, low productivity. This article describes one of these parts