Method for setting travel of press brake
A press brake and stroke technology, applied in the field of adjusting the press brake stroke, can solve the problems that the sensor cannot be adjusted, the angle θ measurement is not very accurate, not very reliable, etc.
Inactive Publication Date: 2006-11-29
BYSTRONIC LASER
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Problems solved by technology
However, experience has shown that the measurement of the angle θ is not very precise and not very reliable, the sensors normally used for this type of measurement cannot be adjusted bit by bit and must be recalibrated for each mold
Method used
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[0027]The press brake depicted in FIG. 2 includes: a moving beam 1 supporting a punch 2 ; and a stationary table 3 supporting a die 4 . The displacement of the moving beam is achieved by means of two hydraulic rams 5, 5' mounted on two corresponding uprights 6, 6' fixed to the base. The machine is equipped with two measuring rulers 9 and 9', mounted on each of its sides, in the bending axis, making it possible to measure the displacement of the moving beam relative to the respective uprights 6, 6'. The bending movement is controlled by an electronic control device 7 . Two pressure sensors 8, 8' are mounted on each of the rams 5, 5' respectively in order to detect the pressure at the top of each of them. The control electronics are arranged to process the signals a1 and a2 respectively emanating from each of the pressure sensors, and also to process the two signals b1 from the measuring rulers 9 and 9' and representing the displacement of the moving beam relative to each of th...
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The invention relates to a method for setting the travel of a press brake comprising at least one sensor, which measures a physical parameter (p) that varies with the force exerted by the punch on a piece of sheet metal placed on the die, and an electronic device that controls the displacement of the mobile apron between a top dead centre and a bottom dead centre (BDC). Said electronic device is provided with computing means for correcting the bottom dead centre value according to the measurement taken for said displacement and for the physical parameter (p). The difference in thickness between the real thickness of the sheet metal and the set value (e) for the sheet metal thickness is measured during bending; instantaneous bending angle alpha under the load of the piece is calculated as a function of the displacement, taking account of said difference in thickness and the geometric parameters of the punch and the die; the bearing force (f) of the punch on the piece is calculated using the value of the physical parameter (p); the sequence of values for the instantaneous bending angle / bearing force pair ( alpha , f) is taken and compared to a reference curve (alpha , f)ref which is pre-recorded during a bending operation involving the same material, and the electronic control device calculates a bottom dead centre correction taking account of the deviation between the (alpha, f) pairs and reference curve ( alpha , f)ref, said difference in thickness and the deformations in the press.
Description
technical field [0001] The invention relates to a method for adjusting the stroke of a press brake. The press brake comprises: a fixed table carrying a die; a moving beam carrying a punch; a displacement device of the moving beam, the displacement device being pressed and fixed to a on the column of the fixed table; a measuring ruler for measuring the displacement (d) of the moving beam relative to the column; at least one sensor for measuring a c Physical parameter (p) of the force change on the workpiece of the nominal thickness (e) of the bend; and an electronic control device to control the displacement of the moving beam between top dead center and bottom dead center (BDC), equipped to obtain displacement measurements (d) and physical parameter (p) means, and computing means for correcting the value of said bottom dead center based on said displacement (d) and physical parameter (p) measurements. Background technique [0002] The applicant's patent CH 686119 describes ...
Claims
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IPC IPC(8): B21D5/02
CPCB21D5/02
Inventor 格瑞特·格里岑彼罗·帕皮
Owner BYSTRONIC LASER