JPH0615820U - Hemming device - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a hemming device capable of simultaneously performing hemming and spot welding of a work edge by one device. [Structure] An upper die (2) for moving up and down with respect to a lower die (1) to bend the edge of the work (WA) is provided, and a fixed electrode (10) is provided at the work edge folding portion of the lower die (1), and movable corresponding to the fixed electrode (10) The arm 4 to which the electrode 6 is attached is pivotally supported on the lower die 1 in a vertically rotatable manner, and a pair of tension springs 7a and 7b are arranged on both sides of the pivot point of the arm 4 so that the arm 4 It is characterized in that a cam plate 8 for rotating the upper and lower molds relative to the upper mold 2 is provided so as to be movable up and down in an axial direction parallel to the upper mold 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hemming device capable of spot welding a bent portion of an edge of a plate-shaped work.

[0002]

[Prior art]

 Lids such as automobile hoods, luggage, and doors have a structure in which the edge of the outer panel is bent inward and the edge of the inner panel is sandwiched. As shown in FIG. 5, the processing step is performed by stacking the inner panel WB on the outer panel WA whose edge is preliminarily bent into an L-shape in the previous step, and applying the adhesive C between the edge of the inner panel WB and the outer panel WA. As shown in FIG. 6, the outer panel WA preliminarily bent into an L-shape is pressed by an unillustrated hemming device to bend the outer panel WA.

Next, the work is conveyed to a spot welding device by a conveyer, and as shown in FIG. 7, the bent portion of the work is set on the fixed electrode EA of the spot welding machine, and the movable electrode EB is set at predetermined intervals. Spot welded.

[0004]

[Problems to be solved by the device]

 The conventional processing steps described above require a hemming device, a conveyor for transferring a work from the hemming device to the spot welding device, and a spot welding machine, which requires a large amount of equipment investment and a large equipment installation space. ing. In addition, there was a limit to the improvement of productivity because the work transfer process was inserted between the hemming process and the spot welding process.

An object of the present invention is to provide a hemming device that solves the above conventional problems.

[0006]

Means for Solving the Problems The gist of the present invention to achieve the above object is to provide a lower die on which a plate-shaped work is placed, and to vertically move the lower die to move the edge of the work. An upper die to be bent, a fixed electrode provided at the work edge bending portion of the lower die, and a movable electrode corresponding to the fixed electrode are attached so that the lower die can be rotated vertically to the side of the lower die. A pivoted arm, a pair of tension springs arranged on the left and right across the pivot point of the arm, and an arm that is provided to be movable up and down in an axial direction parallel to the upper die. It is provided with a cam plate that rotates in the vertical direction relative to each other.

[0007]

[Action]

 With the above structure, the lower die and the upper die perform hemming of the work edge, and at the same time, the arm is vertically rotated to spot-weld the bent portion of the work on the lower die to perform one hemming device. This makes it possible to perform hemming and spot welding at the same time.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a lower mold. An outer panel WA and an inner panel WB are mounted on the lower mold 1 in the case of, for example, an automobile door. An upper die 2 moves up and down with respect to the lower die 1 to press the end edge of the outer panel WA to bend it. A fixed electrode 10 is provided at a bent portion of the outer panel WA edge of the lower mold 1. The lower mold 1 and the upper mold 2 constitute a hemming device.

A support member 3 is erected on a side of the lower mold 1, and an arm 4 is pivotally supported on the lower mold 1 so as to be vertically rotatable toward the lower mold 1. A movable electrode 6 corresponding to the fixed electrode 10 is attached to the front end of the arm 4.

A pair of tension springs 7a and 7b are arranged on the left and right sides of the pivot point of the arm 4 which is pivotally supported. As shown in FIG. 5, the tension springs 7a and 7b are guided by a guide member 11 fixed to the floor so that a rod 12 can slide in the vertical direction, and a tension spring is attached to a ball joint 13 at an upper end of the rod 12. The lower ends of 7a and 7b are hooked so as to swing freely. A stopper 14 is provided at the lower end of the rod 12 and regulates the rising end of the rod 12.

Further, a roller 9 is attached to the rear end of the arm 4, and a cam plate 8 that comes into contact with the roller 9 is provided so as to be movable up and down in an axial direction parallel to the vertical movement of the upper die 2. The cam plate 8 is provided with a cam surface 8a that allows the arm 4 to rotate in the vertical direction relative to the upper die 2 in a protruding manner.

Since the present invention has the structure as described above, as shown in FIG. 1, an outer panel WA whose end edges are pre-bent in an L shape in the previous step, and an inner panel WB assembled on the outer panel WA are combined. And are loaded onto the lower mold 1, the cam plate 8 is moved down, and the upper mold 2 is also started to move down. At this time, both tension springs 7a and 7b are in a balanced and balanced state.

As a result, as shown in FIG. 2, the cam surface 8 a of the cam plate 8 contacts the roller 9 to rotate the arm 4 upward, and retracts to a position where it does not interfere with the lowering movement of the upper die 2. At this time, the tension spring 7a behind the pivot 5 is in a free state and the tension spring 7b in front is in a tension state.

When the upper die 2 reaches the bottom dead center and the L-shaped edge is completely bent, the upper die 2 moves upward as shown in FIG. At this time, the arm 4 is rotated downward to the same position as when the operation of FIG. 1 is started, and both tension springs 7a and 7b are in a balanced state.

At the same time when the upper die 2 moves upward, the cam plate 8 also moves upward. When the upper plate 2 is moved up to a position where it does not interfere with the downward rotation of the arm 4 by the upward movement of the cam plate 8, the movable electrode 6 comes into contact with the bent portion and is provided on the lower plate 1 as shown in FIG. Spot welding is performed between the fixed electrode 10 and the fixed electrode 10. At this time, the tension spring 7a in front of the pivot 5 is in a free state, and the tension spring 7a in the rear is in a tension state.

After the spot welding, the cam plate 8 moves to the rising end, and the arm 4 is rotated upward by the tensile force of the tension spring 7a which is in the tension state, and the operation start state shown in FIG. Returned, complete hemming and spot welding cycle, awaiting next cycle start.

[0017]

[Effect of device]

 As described above, according to the present invention, a lower die on which a plate-like work is placed, and an upper die and a lower die that bend up and down with respect to the lower die to bend the edge of the work. The fixed electrode provided in the bending part, a movable electrode that is in contact with the fixed electrode, is attached to the lower mold so as to be vertically pivotable laterally of the lower mold, and the arm of the arm. A pair of tension springs arranged on both sides of the pivot point and a cam plate that is movable up and down in an axial direction parallel to the upper die and that vertically pivots the arm relative to the upper die. Since the configuration is provided, it is possible to perform hemming processing and spot welding processing on the work edge at the same time with a single device, reducing equipment costs and equipment space, and improving productivity. .

[Brief description of drawings]

FIG. 1 is a side view of the device of the present invention.

FIG. 2 is a side view showing a state in which the device of the present invention is activated.

FIG. 3 is a side view of the device of the present invention when the upper die is lifted from the bottom dead center.

[Fig. 4] Side view of spot welding state

FIG. 5 is a front view showing a tension spring mounting structure.

FIG. 6 is a cross-sectional view before conventional hemming

FIG. 7 is a sectional view after the conventional hemming process.

FIG. 8 is a front view of conventional spot welding processing for a hemming portion.

[Explanation of symbols]

 1 Lower mold 2 Upper mold 3 Support member 4 Arm 5 Pivot 6 Movable electrode 7a Tension spring 7b Tension spring 8 Cam plate 9 Roller 10 Fixed electrode

Claims (1)

[Scope of utility model registration request] 1. A lower die on which a plate-like work is placed, an upper die that moves up and down with respect to the lower die to bend an edge of the work, and a fixing provided at a work edge bending portion of the lower die. An electrode, an arm to which a movable electrode corresponding to the fixed electrode is attached, and which is pivotally supported on the lower mold so as to be rotatable in the vertical direction on the side of the lower mold, and arranged on the left and right with a pivotal fulcrum of the arm interposed therebetween. A pair of tension springs, and a cam plate that is movable up and down in an axial direction parallel to the upper mold and that rotates the arm in a vertical direction relative to the upper mold. apparatus.