Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1991-10-17
1993-05-18
Jones, David
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
72 21, 72389, 72461, B21D 122
Patent
active
052110451
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to an apparatus for determining the correct mounting of a die assembly on a press brake. More particularly, the present invention relates to an apparatus of the foregoing type which assures that an occurrence of interference of back-gauges with the die assembly during an operation of the press brake can reliably be prevented by determining whether or not a correct die assembly corresponding to the kind of work to be worked is mounted on the press brake.
BACKGROUND ART
With respect to a press brake, a work has been hitherto bent by inserting it in the space between a punch and a die until it collides with back-gauges and then lowering the punch toward the die while the position where the work has been inserted in that way is restricted by the back-gauges.
Since a location where the work is to be bent by the press brake in cooperation of the punch with the die differs from step to step, there is a need of displacing the back-gauges at each step corresponding to the location where the work is to be bent. In addition, for the purpose of assuring operational safety during displacement of the back-gauges, there is a need of controllably displacing the back-gauges so as not to allow the back-gauges to interfere with a die assembly comprising a punch and die at all times. Indeed due to the fact that a die to be mounted on the press brake differs corresponding to the kind of work to be worked, and moreover, a region where the back-gauges interfere with die assembly differs corresponding to the kind of work to be worked, there is a need of controllably displacing the back-gauges corresponding to the kind of work to be worked.
Here, conventional typical techniques for avoiding undesirable interference of the back-gauges with the die assembly can be noted below. configuration of a die f, i.e., a lower die half of the die assembly by actuating a key board with his hands at every time when the die assembly is replaced with another one corresponding to the kind of work to be worked. As shown in FIG. 8, the foregoing data is essentially composed of a distance e from the center of the die f to an end surface of the same, a height h of the die f, a distance e from the center of a holder g for immovably holding the die f on a table (not shown) to an end surface of the same and a height h' of the holder g. On completion of the inputting operation, the controller calculates an interference region j as represented by hatched lines in the drawing based on the inputted data and then determines whether or not a target position at the foremost end of a back-gauge i enters the interference region i. Thereafter, the operator outputs results derived from the foregoing determination to the controller. data on the die f with the aid of the controller at every time when the die f is replaced with another one. Thereafter, the operator inputs into the controller data indicative of the interference region j and then controllably displaces the back-gauge j so as not allow the foremost end of the back-gauge i to enter the interference region j.
According to the conventional techniques as mentioned above, however, since there is a need of inputting data into the controller at every time when the die f is replaced with another one, operations to be performed by an operator become complicated, and moreover, a burden to be borne by the operator is enlarged unavoidably.
Indeed, since a die replacing operation is an operation to be individually performed by the operator, there arises an occasion that a die is erroneously selected by the operator when the die replacing operation is performed. Similarly, since a data inputting operation is also an operation to be individually performed by the operator, it is anticipated that data on a die different from the die for which a die replacing operation has been practically performed are erroneously inputted into the controller. In addition, there is a possibility that a die is mounted at the position offset from its preset position toward the back
REFERENCES:
patent: 4831862 (1989-05-01), Ohashi et al.
Jones David
Kabushiki Kaisha Komatsu Seisakusho
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