白铁制件成形的关键在于展开下料,如何能准确、简单、迅速地做出展开图,是提高白铁制件劳动生产率的重要一环。 我们经过多年实践,摸索出了许多新的展开下料方法,两节任意同径弯头的展开下料就是其中的一种。该方法与老传统下料方法相比,既不用画实样,又简便省时。下图所示为两节任意角度(以70°为 The key to forming white iron parts lies in unwinding. How to make the unfolded drawings accurately, simply and quickly is an important part of improving the labor productivity of the white iron parts. After years of practice, we have explored many new ways of unwinding the blanks, one of which is the unwinding of two sections of any bend with the same diameter. Compared with the old traditional blanking method, this method does not need to draw a real picture and saves time. The figure below shows two arbitrary angles (at 70 °)