Device and method for hemming processing

Abstract

For example, in hemming processing that is performed along the peripheries of an automobile door panel, conventionally, a bent portion of the panel formed by flanging processing is previously bent at an angle of approximately 45°, and then is finally bent by changing a posture of a bending roller and rolling thereto again. Therefore, it is difficult to shorten time for hemming processing. It is one object of the present inventions to complete hemming processing in only one rolling step, to thereby reduce working time for hemming processing. Therefore, the invention is constructed such that a bending roller R rolls on a bent portion We in a posture that an axis of rotation R3 of the bending roller is rearwardly inclined relative to a normal line R2 perpendicular to a rolling direction R1 at a side of a folded edge Wee of the bent portion in a plan view. According to this construction, because the bent portion We is bent while a side pressure in a bending direction is applied thereto, the bent portion We can be bent to a folded state in one bending step.

1 . A hemming method characterized in that a side pressure in a bending direction is actively applied to a bent portion of a work that is formed by flanging processing, thereby bending the bent portion to a folded state in one bending step.  
     
     
         2 . A roller type hemming method, the method being performed by pressing a bending roller on a bent portion of a work that is formed by flanging processing, characterized in that a side pressure in a bending direction is applied to the bent portion by moving the bending roller in a rolling direction while a bending surface of the bending roller is rearwardly inclined relative to a normal line perpendicular to the rolling direction at a side of a folded edge of the bent portion, thereby bending the bent portion to a folded state in one bending step.  
     
     
         3 . A hemming device that is used for performing the hemming method as defined in  claim 2  comprising a multi-axes type robot hand, a bending roller rotatably attached to the robot hand, and a controller that controls the action of the robot hand such that the bending roller rolls on the bent portion in a posture that an axis of rotation of the bending roller is rearwardly inclined relative to the normal line perpendicular to the rolling direction at the side of the folded edge of the bent portion in a plan view.  
     
     
         4 . A hemming device that is used for performing the hemming method as defined in  claim 2  comprising a multi-axes type robot hand, a tapered bending roller rotatably attached to the robot hand, and a controller that controls the action of the robot hand such that the bending roller rolls on the bent portion in a posture that a small diameter side of the bending roller is positioned at the side of the folded edge of the bent portion and a rolling surface of the bending roller is parallel to the bent portion when hemming processing is completed.  
     
     
         5 . A press type hemming method for folding a bent portion of a work that is formed by flanging processing, the method being performed by pressing a bending blade to the bent portion, characterized in that a side pressure in a bending direction is actively applied to the bent portion by pressing the bending blade while moving it in a resultant direction of a direction of a surface of the bent portion and a direction perpendicular thereto, thereby bending the bent portion to a folded state in one pressing step.  
     
     
         6 . A hemming method as defined in  claim 5  characterized in that the bent portion is incompletely bent while moving the bending blade in the resultant direction of a die closing direction and a direction perpendicular thereto, and then the bending blade is lowered with an upper die, thereby bending the bent portion to the folded state.  
     
     
         7 . A hemming device that is used for performing the hemming method as defined in  claim 5  or  6  comprising a lower die that supports the work, an upper die that vertically moves relative to the lower die, a bending blade that is attached to the upper die and is movable in the direction perpendicular to a die closing direction, and a bending blade moving mechanism that moves the bending blade in the direction perpendicular to the die closing direction.  
     
     
         8 . A hemming device that is used for performing the hemming method as defined in  claim 5  or  6  comprising an X-axis moving mechanism that moves the bending blade along the X-axis corresponding to the direction of the surface of the bent portion, and a Y-axis moving mechanism that moves the bending blade along the Y-axis perpendicular to the X-axis, wherein the bending blade is adapted to press the bent portion while moving it in the resultant direction of the direction of the X-axis and the direction of the Y-axis.  
     
     
         9 . A hemming device as defined in  claim 8  characterized in that the movement of the bending blade by means of the X-axis moving mechanism and/or the Y-axis moving mechanism is numerically controlled.