| 摘要 |
PURPOSE:To improve machining accuracy and enable efficient production by carrying out perforation in the stage of flat iron and assembling the sheets of perforated flat iron to manufacture an accurate H-section structure, at the time of machining steel plate parts for a steel structure and the production of built-up H steels. CONSTITUTION:In the production process of built-up H-steels, a material is thrown into a device and sent by a push bogie without being numerically controlled and, when the end of the material is detected, it is stopped to carry out the marking-off for end part cut positions. And, cutting and perforation are carried out accurately and efficiently in the stage of a plate before assembling. After that, the plates are assembled into an H-section. The perforation on the marked end of a sheet of flat iron in this former stage is continuously carried out by numerical control. At the same time, the machining of a batten plate having overwhelmingly large number of holes and with a large machining load can also be efficiently carried out. Also, since many members are of a common shape, perforation can be carried out on piles of sheets particularly for perforation with a large machining load.
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