Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1990-09-14
1993-01-05
Jones, David
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
72316, 72322, 72389, B21D 504
Patent
active
051760177
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a bending machine such as a press brake and the like, and more particularly to a tool position controller of the bending machine for controlling a bending angle of a desired portion of a workpiece or elongated sheet metal during a bending operation performed on the bending machine.
DESCRIPTION OF THE PRIOR ART
Hitherto, in case that an elongated sheet metal or workpiece must be bent, a bending machine such as a press brake is employed to perform a bending operation of the workpiece.
Such bending machine is provided with elongated tools comprising an elongated punch and an elongated die between which the sheet metal or workpiece is clamped under pressure and then subjected to the bending operation thereof. Hitherto, a large variety of apparatuses and methods, which compensate for deflections of the tools and control a bending angle of the sheet metal or workpiece during the bending operation thereof on the bending machine, has been proposed.
Included among these conventional apparatuses and methods having been proposed are, for example: an apparatus and a method for compensating for deflections of tools during a bending operation of a workpiece on a bending machine by applying a hydraulic pressure to a plurality of hydraulic cylinders disposed under a die or tool, which hydraulic pressure is so controlled as to correspond to deflections of the tools comprising the die and a punch, the deflections of the tools being detected by strain gages; and others in the prior art disclosed in Japanese Patent Publication Nos. 57-27773, 52-20431, 54-417 and 55-41848.
In the above conventional apparatus and method in which the hydraulic pressure corresponding to the deflections of the tools is applied to the hydraulic cylinders, it is possible to compensate for the deflections of the tools during the bending operation of the workpiece on the bending machine. However, each of the hydraulic cylinders employed in the conventional apparatus and method does not perform its own tool position control, and, therefore, can not control a bending angle of the workpiece during the bending operation thereof.
On the other hand, in case of a bending tool disclosed in the Japanese Patent Publication No. 57-27773, it is not possible for the bending tool to perform a continuous fine control of a bending angle of a desired portion of the workpiece under pressure. Consequently, in cases where the bending angle of the workpiece varies locally during the bending operation of the workpiece performed by such bending tool, it is impossible for the bending tool to compensate for such local variations in bending angle of the workpiece under pressure. On the other hand, each of the others in the prior art disclosed in the Japanese Patent Publication Nos. 52-20431 and 54-417 is a mechanical press brake in which: a ram is moved up and down by means of a link mechanism; and a die is pushed up by a hydraulic cylinder to control a bending angle of a workpiece. However, such a mechanical press brake does not fulfill the function of position control, and, therefore, cannot compensate for variations in the bending angle of the workpiece due to various factors. In addition, since the mechanical press brake is of a type controlling the pressure of the hydraulic cylinder, a bending pressure applied to the workpiece is dispersed. Consequently, the mechanical press brake cannot perform an effective compensation for the variations in bending angle of the workpiece.
SUMMARY OF THE INVENTION
Under such circumstances, the present invention was made. Therefore, it is an object of the present invention to provide a tool position controller of a bending machine for controlling a bending angle of a desired portion of a workpiece or elongated sheet metal during a bending operation thereof performed on the bending machine.
The above object of the present invention is accomplished in accordance with a first aspect of the present invention by providing:
A tool position controller of a bending machine comprising:
REFERENCES:
patent: 4331018 (1982-05-01), Doyle
patent: 4356716 (1982-11-01), Aschauer
patent: 4658624 (1987-04-01), Ridgway et al.
patent: 4658625 (1987-04-01), Koyama et al.
patent: 4966029 (1990-10-01), Zbornik
patent: 5007264 (1991-04-01), Haack
Jones David
Kabushiki Kaisha Komatsu Seisakusho
Kananen Ronald P.
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