首页|Researchers Submit Patent Application, 'Welding cell, use thereof and welding me thod performed therewith', for Approval (USPTO 20240139854)
Researchers Submit Patent Application, 'Welding cell, use thereof and welding me thod performed therewith', for Approval (USPTO 20240139854)
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News editors obtained the following quote from the background information suppli ed by the inventors: “Resistance spot welding became commonly used in the automo tive industry. For example, spot welding is used for connecting vehicle metal bo dy parts. A welding gun for spot welding generally has two electrodes with at le ast one movable electrode driven by a linear electromechanical actuator (hereina fter, EMA). The welding gun is located on an arm of an industrial manipulator (h ereinafter, a robot), which is controlled by the controller of the robot. During configuration, a spatial coordinate of the end of the electrode of the welding gun is determined, for example, by bringing the electrode to the calibration pla te without a gap between them and recording the current coordinate. Before weldi ng, the robot is trained-with a control unit an operator brings the welding gun to the weld spot such that the second electrode touches one of the workpieces. D uring welding, the robot moves the welding gun to two or more workpieces fixed i n the equipment such that the one of welding gun electrodes touches one of the w orkpieces at a right angle to the surface of the part to be welded. Then, in res ponse to a command from a weld timer to the robot controller in accordance with a welding program stored in the weld timer internal memory, the EMA brings the m ovable electrode to the workpieces. After the movable electrode contacts one of the workpieces, the welding gun clamps the workpieces between the electrodes wit h a prescribed force. This force is maintained by limitation of EMA motor curren t consumption at a certain level corresponding to said force. Further, the force which the workpiece is clamped with is referred to as an electrode clamping for ce. Then by a command from the weld timer in accordance with the stored welding program, the prescribed electric current is passed to a transformer located on t he welding gun. The transformer amplifies the current to thousands of amperes an d passes the current through the electrodes, in particular, through caps on the ends thereof that contact the workpieces, and through the workpieces, which caus es local heating, melts the metal in the clamped area and forms a weld nugget. A fter the welding current is no longer supplied (electric current application is predefined in the welding program as well), the metal cools and hardens, and the parts become joined at the weld nugget-a weld spot is created. Then the weld ti mer sends command to the robot to open the welding gun and release welded parts. The robot then moves the welding gun electrode away from the completed weld spo t and to a next weld place on the same parts.
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