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  Process and pneumatic device for detecting the bending angle of a plate sheet in a bending pressUSPTO Application #: 20070186602Title: Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press Abstract: The invention refers to the field of bending presses for plate sheets and more precisely it refers to a process and a device for detecting the bending angle in real time when the press punch operates on the sheet placed above the matrix die. The process provides for the generation of at least two flows of compressed air in at least two matrix die points that are totally or partially covered by the plate sheet. The pressure variation during the bending step is measured and such variation is compared with sample pressure values. The device provides for a compressed air system with a pressure reducer that supplies four orifices and a servo-controlled device that performs a compensation. (end of abstract) Agent: Young & Thompson - Arlington, VA, US Inventor: Giovanni Cella USPTO Applicaton #: 20070186602 - Class: 072031100 (USPTO) Related Patent Categories: Metal Deforming, With Indication Of Condition Or Position Of Work, Product, Or Machine Element (e.g., Broken Tool Alarm, Etc.), Including Deformation By Simple Bending The Patent Description & Claims data below is from USPTO Patent Application 20070186602. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention deals with a process and a pneumatic device for detecting the bending angle of a plate sheet in a bending press. [0002] As known, bending presses can have different construction variations. The most widespread ones are composed of a moving table supporting a punch and a fixed table supporting a matrix die. [0003] The moving table can translate in a vertical plane along two risers on which two hydraulic cylinders are assembled for this movements. [0004] Matrix die and punch have different shapes depending on the bending angle that has to be obtained, and therefore are both or only one of them interchangeable, provided that they are compatible. [0005] The plate sheet is rested onto the matrix die and the punch drops over it. [0006] One of the major problems of bending presses is verifying, at the end of the bending step, the bending angle and in particular whether such angle coincides with the desired angle. [0007] In fact, it is known that the plate dose not keep the angle imprinted by punch and matrix die due to the elastic return of the plate itself. [0008] The elastic plate return can be determined with difficulty, since it depends on three major variable factors: [0009] plate thickness, which is not constant in all plate sheet points; [0010] material of which the plate is composed; [0011] lamination direction of the plate sheet. [0012] Such factors can change for the same sheets and for the same workings, so that it is necessary, for every bend plate sheet, to verify whether the bending angle coincides with the desired angle and possibly intervene with a new pressing action. [0013] Several systems, of the mechanical and of the optical type, are already known for detecting the bending angle, and the most accurate ones provide for carrying out the measure on four points. [0014] The mechanical system disclosed, for example, in U.S. Pat. No. 4,131,008, IT-A-1293374, IT-A-1294147, provide for feeler means to detect the bending angle on the plate intrados or extrados, composed of one or two elastically yielding and independent forks. [0015] In case of two forks, they can be placed one inside the other or side by side. [0016] The fork heads or bits are adapted to be arranged in contact with the sheet plate. [0017] The two elastically yielding forks are connected on their lower side to a related position transducer that communicates with a logical data processing unit that manages the bending press. [0018] Another system of the mechanical type is disclosed in DE-A-10006512 in which, for detecting the bending angle, two levers are used with their fulcrum onto the matrix die and which, through their rotation movement, operate on a signal transducer. [0019] Another system for detecting the bending angle is the one manufactured by the Belgian Company LVD that provides for a moving arm, placed beside the matrix die, which, supported by two linkages, and during the bending stage, arranges sensor means in contact with one of the two wings of the diverging plate. [0020] The sensor means are coaxially moving with respect to such arm and provide detection data to the bending press logical unit. [0021] These mechanical system have the inconvenience that they cannot be applied to all types of matrix dies, in particular matrix dies with narrow slots, since physically there is no room for inserting the forks. [0022] Moreover, the fork movement can be constrained by the presence of dirt or metallic debris that can always be found in environments where metals are worked. [0023] The optical system, see WO-A-01/28706, provides for at least one source of a light beam that is used for projecting two spots or a linear segment onto part of the sheet to be controlled. [0024] The bending angle is given by the distance between the projected spots, the known beam incidence angles, and the known distance between detection planes. [0025] The passing channels of the two light beams create a punch weakening; moreover, such channels can be easily occluded by debris or impurities that can be found on the plates thereby impairing their reading or making it unreliable. [0026] It also known from patent EP 1083403 a method and device for detecting the bending angle of a plate. EP 1083403 shows a bending die having orifices in the face and slot side. In order to detect the bending angle, the pressure difference in an orifice is measured. With the help of tables, formulas, etc the value of the pressure difference is transferred in a value of an angle. [0027] Object of the present invention is ensuring the bending angle determination with a system that is able to avoid any occlusion or reading obstacle. [0028] These and other objects are all obtained by the process and the device of the present invention, that is characterised by what is provided in the enclosed claims. Continue reading... Full patent description for Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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