| 摘要 |
PURPOSE:To make the production of a roughly-shaped steel for shape steels possible efficiently by utilizing the bulges in the broadside end parts of a slab produced by screwing down a flat slab largely in its width direction. CONSTITUTION:A flat slab 3 is worked to an intermediate rough blank material 4 having guide grooves 10, 10' on the short side faces by means of channel type calibers 1, 1' having projections 2, 2' of the height 0.1-0.28 times the thickness b3 thereof. Next, the bottom width of the caliver with projections 6, 6' is broadside screwed down largely with channel type calibers 5, 5' with projections of b5, whereby it is worked to an intermediate blank material 7 having guide channels 11, 11'. The height of the projections 6, 6' is made roughly the same as that of the projections 2, 2', and part of the enclosing lines of the projections 6, 6' are made >=0.15 times the length of the enclosing lines of the projections 2, 2'. These projections are so formed that the angles formed by the tangents of the enclosing lines and the bottom parts of the calibers are 35-55 deg.. Such material 7 is finish formed as it is with finishing calibers 12, 12' for roughly-shaped steel of the 2nd stage, whereby a desired roughly-shaped steel 13 is produced. |
