Honda Motor Co., Ltd.

Eisaku Hasegawa

Takeshi Nakamura

Hiroshi Miwa

Yoshiyuki Kinouchi

Sumitomo Watanabe

Noriko Kurimoto

Mitsutaka Igaue

Takafumi Ikeda

Masahito Mutou

Katsumi Takeishi

Noriko Uematsu

Mitsugu Kaneko

Toshiyuki Kondo

Nobuhiro Kozasa

Hitoshi Yoshimichi

Koichi Matsumoto

Haruhiko Kobayashi

Teruaki Kobayashi

Kensaku Kaneyasu

Shunsuke Ishii

Koki Sanada

Shogo Matsuda

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.

One-side resistance spot welding method and apparatus for carrying out the same

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.

Spot welding method and 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.

One-side spot welding method and one-side spot welding 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 Wand Wthat are not uniform in thermal contraction with respect to an energizing direction, the workpieces Wand Ware clamped with a pair of roller electrodesandwhile applying current. The welding is performed in a state where the roller electrodethat abuts on the workpiece Whaving higher thermal contraction is offset in an advancing direction ahead of the roller electrodethat abuts on the workpiece Whaving lower thermal contraction.

Seam welding warpage prevention method and 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.

Hemming working method and working apparatus

A panel positioning apparatus is provided with an outer panel supporting deviceadapted to support the outer panelfrom a lower side of the outer paneland an inner panel supporting deviceadapted to support the inner panelfrom an upper side of the inner panel. The outer panel supporting devicehas a lower-surface contact sectionadapted to abut against a lower surface of the outer panel. The inner panel supporting devicehas an upper-surface contact sectionadapted to expose below the inner paneland to abut against an upper surface of a part of the outer panelagainst which the lower-surface contact sectionabuts. The outer paneland the inner panelare overlaid with each other, and a bending partA of the outer panelis bent by pinching the outer panelby the lower-surface contact sectionand the upper-surface contact section

Panel positioning apparatus and panel integration method

A welding gun precludes moisture from penetrating inside of a motor housing due by preventing development of negative pressure inside the motor housing. The welding gun includes a feed screw mechanism that is coupled to a servo motor and has a hollow rod that reciprocally moves in a predetermined direction by way of torque applied by the servo motor, and a moveable electrode tip that is connected to a leading end portion of the hollow rod and opens and closes relative to a fixed electrode tip according to the reciprocal movement of the hollow rod. The servo motor has a motor housing in which a motor housing hollow part accommodating a portion of the hollow rod to be reciprocally moveable is formed. A vent that ventilates the motor housing hollow part with ambient air is formed in the motor housing.

Welding gun

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.

Seam welding apparatus and seam welding method

A movable dieincluding a first grooveand a second groovethat extend in a direction in which hemming is performed is moved by a robot, and is positioned and set with respect to a wheel arch portionin a vehicleon a production line. The movable dieis mounted, positioned and fixed with respect to the vehicleby a clamping mechanism. A guide rolleris rolled while the guide roller is engaged with the first groove, and a flangeis inclined by a conical surface of a tapered rollerof a hemming rollerthat moves in an interlocking manner with the guide roller. Next, the guide rolleris rolled while the guide roller is engaged with the second groove, and the flangeis bent by a cylindrical surface of a cylindrical rollerof the hemming roller. The movable dieis separated from the vehicleafter the hemming.

Hemming method and hemming apparatus

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.

Roller hemming method and hemmed member

In an initial state of roller hemming processing, an erected flangebegins to be bent by a roller. At this time, a first plateand a receiving faceare brought into tightly contact with each other at a contact pointbetween the rollerand the erected flangeby strongly pinching by the rollerand an auxiliary roller. On the other hand, in portions other than the contact point, the receiving facetends to be separated from the first plateby reaction. Since slider blocksandare movable along railsandon a side of the receiving die, the receiving dierotates clockwise in the drawing about the contact point. A tight contact in the contact pointis guaranteed as the receiving dierotates about the contact point. As a result, the hemming processing with a good shape can be achieved without wrinkling, ruffling, or deformation.

Roller hemming apparatus and roller hemming 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.

Hemming working method and panel assembly manufacturing method

A three-dimensional shape measuring method and a measuring apparatus thereof that allow the operation of a robot to be readily taught and set in a short time when a three-dimensional measuring device mounted on the robot is caused to move along the surface of a work, thereby measuring the shape of the work. A block data representative of measurement operation that causes the three-dimensional measuring device, which is a laser scanner, to move along the surface of the work is set and recorded. Then longitudinally copying (Step S) and laterally copying (Step S) block data is longitudinally and laterally copied after entering the size and basic shape type of the work. Then the shape of the work is measured on the basis of the copied block data.

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Tochigi, Japan

Eisaku Hasegawa