对于一些薄壁管路的弯曲,如火炉烟筒、建筑物的水落管,各种机械设备的通风及料物输送管路等,每年的用量是非常大的。如火炉烟筒弯头,仅天津一市估计每年就需1百万件以上。对于这类薄壁管弯头的制作目前在我国还沿用着一种古老的工艺方法,即采用划线、分节下料、咬口联接的方法。采用这种方法得到的薄壁弯管费工、费料。同时弯管强度低,使用寿命短。本文介绍一种新设计的Wj—薄壁管弯曲 For some thin-walled pipe bending, such as the furnace chimney, the building downspouts, all kinds of mechanical ventilation and material piping, etc., the annual amount is very large. Such as stove pipe bends, Tianjin alone is estimated to need more than 1 million pieces per year. For the production of such thin-walled pipe elbow currently used in our country also an ancient process, that is, the use of scribing, sub-section cutting, articulation method. The thin-walled elbows used in this method are laborious and costly. At the same time, bending strength is low, short service life. This article describes a new design of Wj-thin-walled tube bending