| 摘要 |
<p>The invention provides, with reference to the figure, a method of forming a tubular blank of a desired cross section from a tubular blank (10) of different cross section by means of closing parts (30, 40) of a die around the tubular blank (10), the die defining a cavity having the desired cross section, and supporting an interior surface of the tubular blank (10) during closing of the parts (30, 40) of the die. In the method of the invention the interior surface of the tubular blank (10) is supported during closing of the parts (30, 40) of the die by a solid insert (20) which is deformed when the tubular blank (10) is deformed by the closing parts (30, 40) of the die and which resists deformation thereby providing support for the interior surface.</p> |
