Patent application number | Description | Published |
20100326965 | SEAM WELDING APPARATUS AND SEAM WELDING METHOD - A seam welding apparatus and a seam welding method perform a seaming process on workpieces of various shapes having flange sections, by preventing a welding track formed by upper and lower rotary electrodes from becoming displaced from a welding reference line established on the flange section. The seam welding apparatus includes two rotary electrodes for gripping the flange section therebetween while seam-welding the flange section, a support for synchronizing movements of the two rotary electrodes with each other in a widthwise direction of the flange section, a turning mechanism for pressing at least one of the two rotary electrodes toward the workpiece body, a roller that abuts against an end face of the flange section, and roller adjusting means for positionally adjusting the roller. | 12-30-2010 |
20110180518 | RESISTANCE WELDING METHOD - A resistance welding method, which resistance-welds a pair of workpieces by gripping the workpieces with a pair of electrode tips under a prescribed welding pressure, and supplies a welding current through the electrode tips to the workpieces, includes the steps of detecting a change in an amount of expansion of a nugget produced in the workpieces, along a direction in which the electrode tips grip the workpieces therebetween, determining whether the detected change is smaller than a threshold value or not, and gradually increasing the welding current flowing through the workpieces after the detected change is judged as being smaller than the threshold value. | 07-28-2011 |
20110233173 | SEAM WELDING METHOD AND MACHINE THEREFOR - A seam welding machine includes a first roller electrode and a second roller electrode that hold a layered body formed by layering a plurality of workpieces. The first roller electrode is in contact with a thinnest workpiece, which is disposed on an outermost side of the layered body. The seam welding machine has a current-branching electrode held in contact with the thinnest workpiece, and which is charged with a polarity opposite to that of the first roller electrode. Accordingly, when an electric current is applied between the first roller electrode and the second roller electrode that hold the layered body, a branch electric current is applied from the first roller electrode to the current-branching electrode, or a branch electric current is applied from the current-branching electrode to the first roller electrode. | 09-29-2011 |
20120074113 | SPOT WELDING METHOD AND SPOT WELDING APPARATUS - A spot welding method and a spot welding apparatus are provided. A stacked assembly of at least three workpieces is gripped between first and second welding tips. An inner workpiece positioned inside of the stacked assembly, of two of the workpieces that exhibit a maximum contact resistance in the stacked assembly, is electrically connected to a ground electrode, or to an electrode having the same polarity as the second welding tip near an outer workpiece positioned adjacent to the inner workpiece and facing outwardly from the stacked assembly, of the two workpieces. Then, electric current is applied from the first welding tip toward the second welding tip. In this case, first, the stacked assembly is pressed under a first pressing force, and then, the stacked assembly is pressed under a second pressing force which is greater than the first pressing force. | 03-29-2012 |
Patent application number | Description | Published |
20080307630 | Hemming Working Method and Working Apparatus - A moving die is held by a robot and made to approach a vehicle, and a positioning pin is inserted into a positioning hole of the vehicle. The moving die is brought into a floating state of being displaceable relative to the vehicle by reducing a force of the robot for maintaining an attitude thereof. In a state of holding the moving die by the robot, a surface of the moving die is brought into contact with the vehicle by an adsorbing mechanism including an adsorbing portion of an elastic member provided to the moving die. The moving die and the robot are cut to be separated. | 12-18-2008 |
20090139293 | HEMMING METHOD AND HEMMING APPARATUS - A movable die | 06-04-2009 |
20100104798 | ROLLER HEMMING METHOD AND HEMMED MEMBER - In a roller hemming method for folding a flange erected from a workpiece by pressing a working roller against the flange and moving the working roller relative to the flange, the flange is folded by: a first temporary bending step of bending a tip-side portion of the flange into a state that the tip-side portion is inclined; a second temporary bending step of bending a remaining, base-side portion of the flange into a state that the base-side portion is inclined; and a full bending step of bending the thus-bent flange into a final shape so that the flange is into contact with a flange-proximate portion. | 04-29-2010 |
20100154503 | ROLLER HEMMING APPARATUS AND ROLLER HEMMING METHOD - In an initial state of roller hemming processing, an erected flange | 06-24-2010 |
20120074103 | SEAM WELDING WARPAGE PREVENTION METHOD AND APPARATUS - It is an object of the present invention to provide a seam welding warpage prevention method and apparatus capable of preventing warpage caused by cooling contraction after welding, in a case where workpieces are different from one another in material and thickness, and thus not uniform in thermal contraction. In the seam welding warpage prevention method for welding a plurality of workpieces W | 03-29-2012 |
20120117783 | PANEL POSITIONING APPARATUS AND PANEL INTEGRATION METHOD - A panel positioning apparatus is provided with an outer panel supporting device | 05-17-2012 |
20120291508 | HEMMING WORKING METHOD AND WORKING APPARATUS - A moving die is held by a robot and made to approach a vehicle, and a positioning pin is inserted into a positioning hole of the vehicle. The moving die is brought into a floating state of being displaceable relative to the vehicle by reducing a force of the robot for maintaining an attitude thereof. In a state of holding the moving die by the robot, a surface of the moving die is brought into contact with the vehicle by an adsorbing mechanism including an adsorbing portion of an elastic member provided to the moving die. The moving die and the robot are cut to be separated. | 11-22-2012 |
20130056451 | ONE-SIDE SPOT WELDING METHOD AND ONE-SIDE SPOT WELDING APPARATUS - A one-side spot welding method for causing an electrode to contact a welding portion of a work-piece only from one side of the work-piece to weld the work-piece, the method includes a nugget forming process of applying welding pressure to the work-piece through the electrode, and causing the work-piece to be fully electrically conducted at a predetermined current value, and a slow-cooling process of applying welding pressure to the work-piece through the electrode from the one side, and causing the work-piece to be electrically conducted at a current value lower than the predetermined current value after the nugget forming process. | 03-07-2013 |
Patent application number | Description | Published |
20080230588 | HEMMING WORKING METHOD AND PANEL ASSEMBLY MANUFACTURING METHOD - A hemming working is performed by a positioning step of positioning a first panel formed with a projected portion for welding on a second panel formed with a flange portion; a first bending step of bending the flange portion; and a second bending step of pressing the flange portion on an outer side of the projected portion. | 09-25-2008 |
20080256779 | HEMMING WORKING METHOD AND HEMMING WORKING DEVICE - A hemming working device is provided with: a jig body configured to support a first workpiece and a second workpiece which are overlapped; and a working drive portion configured to join the first workpiece and the second workpiece and perform a hemming on the first workpiece and the second workpiece. The jig body is provided with: a holding mechanism capable of holding the first workpiece and the second workpiece; and a backing member capable of being contacted with a portion of the first workpiece where hemming working is executed. | 10-23-2008 |
20110147355 | WELDING GUN - A welding gun is provided in which moisture does not penetrate inside of a motor housing due to preventing the inside of the motor housing from becoming negative pressure. The welding gun includes a feed screw mechanism ( | 06-23-2011 |
20140158668 | ONE-SIDE RESISTANCE SPOT WELDING METHOD AND APPARATUS FOR CARRYING OUT THE SAME - A one-side resistance spot welding method includes a preheating step followed by a welding step. In the preheating step, an electric current having a smaller current value than a welding current is fed from a first electrode to second electrodes such that a substantially annular high-temperature region coaxial with the first electrode and having a higher temperature than neighboring parts is created in a workpiece due to resistance heat generation at a position located near a tip end of the first electrode. In the welding step, the annular high-temperature region forms a shielded current path due to its high electric resistance and serves to guide a welding current from the first electrode to flow into a bottom steel sheet of the workpiece via the shielded current path, thereby allowing the welding current to subsequently advance along the bottom steel sheet and reach the second electrodes via a top steel sheet. | 06-12-2014 |