| 摘要 |
PROBLEM TO BE SOLVED: To provide a press brake which can improve productivity by accurately judging bending completion timing, and also to provide a machining method using this press brake. SOLUTION: A ram position detecting means 13 detects and feeds back the position of a ram 3U, and a machining completion discriminating part 35 constantly monitors a ram position-detecting signal, discriminating the bending as completed when the change in the position detecting signal shows a preset value or below, and transmitting a completion signal; therefore, the completion of the bending can be automatically and accurately judged. In addition, when the completion signal is transmitted, a timer 39 starts counting time and, when a preset prescribed time is counted up, a ram movement-commanding part 19 instructs the ram 3U to start a retreating movement; therefore, the timer 39 can be set short, enabling the ram 3U to start the retreating movement in the shortest time regardless of the type of the material. Consequently, the productivity can be enhanced.
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