Roller hemming device and roller hemming method

Abstract

A roller (48) starts to bend a standing flange (65) in the initial state of a roller hemming processing. A first plate material (63) is fitted to a receiving face (15) by the strong holding action of the roller (48) and an auxiliary roller (51) at a contact point (70) between the roller (48) and the standing flange (65). On the other hand, the receiving face (15) tends to be separated from the first plate material (63) by the reaction thereof at those portions other than the contact point (70). Since slider blocks (22) and (22) are movable along rails (21) and (21) on a receiving mold (10), the receiving mold (10) is rotated clockwise about the contact point (70) (as shown in the figure). Since the receiving mold (10) is rotated about the contact point (70), the adhesiveness of the first plate material to the receiving face at the contact point (70) can be assured. As a result, the hemming processing free from wrinkles, waving, and deformation to provide excellent shape can be achieved.

Description

technical field [0001] The present invention relates to the improvement of roll hemming technology. Background technique [0002] The processing technique of overlapping two sheet materials and bending the edge of one sheet onto the edge of the other sheet to connect the edges of the two sheet materials has been widely practiced, and this technique is called hemming. [0003] Among the hemming techniques, the pressure hemming method using a die is well known, but there is also a roll hemming method using another method (for example, refer to Japanese Patent Publication No. 7-16731 ​​(FIGS. 1 and 3).). [0004] Japanese Patent Application Publication No. 7-16731 ​​will be described based on the drawings described later. Fig. 16(a) and Fig. 16(b) are diagrams explaining the basic principle of the prior art. In FIG. 16( a ), a workpiece 102 is placed on a crimping die 101 , and the edges of the workpiece 102 are pressed by clamping arms 104 , 104 of clamping mechanisms 103 , ...

AI Technical Summary

Problems solved by technology

[0013] If roll hemming is performed with the gap 125 left, so-called wrinkle accumulation and waviness will occur, resulting in poor shape of the finished product

Since the gap 125 cannot be allowed, the clamping force will be strengthened to eliminate the gap 125, which will cause extrusion damage on the holding arm 121 or deform the holding arm 121.

[0014] For the above reasons, the roll hemming using the existing hemming die 101 cannot be applied to rigid parts such as white metal car bodies.

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