JPS5950920A - Bead forming method - Google Patents

Abstract

PURPOSE:To perform continuously a bead forming work, to enable an end- working, and to reduce man-hours and the number of the parts, by providing hard rubber rolls for pressing and holding a workpiece to forming rolls, in a bead forming work. CONSTITUTION:When a workpiece 1 is bitten by forming rolls 5, hard rubber rolls 6 come into contact with the workpiece 1 prior to the rolls 5 because the roll 6 is larger in diameter than the roll 5, and the workpiece 1 is already in a state of being pressed and held by the elasticity of the roll 6 before being bitten by the rolls 5. Thus the bead forming work is continuously performed, while maintaining this state, by drawing the workpiece 1 from the rolls 5 by driving the rolls used for sending the workpiece 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a bead forming method suitable for bead forming processing of long thin plates.

[Prior art]

Figure 1.2 shows an example of a bead-formed long thin plate.
A conventional bead forming method will be explained with reference to FIG. When processing such a bead-formed workpiece 1, the roll-processed member 2 is processed by the roll-forming method, and the end portion 3, which cannot be processed by the roll-forming method, is separately press-formed, and then welded and joined at the weld line 4. To manufacture.

[Purpose of the invention]

As mentioned above, in the conventional roll forming method, the end portion cannot be processed, so welding must be performed, which increases the number of parts and the number of manufacturing steps. The object of the present invention is to enable bead forming processing that allows end processing.

[Summary of the invention]

If a bead forming process as shown in FIG. 1 is performed using the conventional roll forming method, buckling deformation occurs in processing the end portion because the periphery of the thin plate that is pressed by the rolls is not constrained. In order to eliminate this drawback, the present invention surrounds the forming roll with a hard rubber roll and utilizes the elasticity of the roll to restrain it under pressure. ) Enables continuous bead stretch molding while preventing clogging.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIG. 4, and a cross section of the bead-formed portion thereof is shown in FIG. In the figure, 5 is a forming roll, 6 is a hard rubber roll having a larger diameter than the forming roll 5, and 7 is a feed roll for the workpiece 1. When the forming roll 5 bites the workpiece 1, the hard rubber roll 6 is larger in diameter than the forming roll 5, so the hard rubber roll 6 hits the workpiece 1 first, and the forming roll 5 hits the workpiece 1. Before the workpiece 1 is bitten, the workpiece 1 is already in a state of being pressurized and restrained by the elasticity of the hard rubber roll 6. The pressurizing restraint force can be easily adjusted by adjusting the difference in diameter of these rolls.

In this way, the workpiece 1 is held between the forming roll 5 and the hard rubber roll 6, and the feed roll 7 for the workpiece 1 is driven to pull out the workpiece l from the forming roll 5.
This allows for continuous bead forming. At the processing section T, the upper and lower sides of the forming roll 5 that has bitten into the workpiece 1 and the hard rubber roll 6 that is pressurized and restrained are released.

Thereby, the terminal portion is also processed into a predetermined shape.

Note that instead of feeding the workpiece 1, a forming roll 5 and a hard rubber roll 6 may be fed. [Effects of the Invention] According to the present invention, bead forming of a long thin plate workpiece By adding a hard rubber roll to pressurize and constrain the molding rono, bead molding can be performed in a continuous manner from the burr, making it possible to process the ends, reducing manufacturing man-hours and the number of parts, and creating beautiful products. A bead-molded product with a long thin plate appearance can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a long thin plate bead-formed product, Fig. 2 is a cross-sectional view taken along line AA, and Fig. 3 is a long thin plate bead-formed product using the conventional hot welding method. FIG. 4 is an explanatory diagram showing one embodiment of the present invention, and FIG.
The figure is a cross-sectional view of the bead forming processing section of FIG. 4. 1... Bead formed product, 2... Roll processed member by roll forming, 3... End part of outer plate by press working, 4... welding line, 5
...Form roll, 6...Hard rubber roll, 7...Feed roll 1'1 figure'4'3t1 4 figure15 figure

Claims (1)

[Claims] 1 Sandwich the workpiece between forming rolls and hard rubber rolls,
A bead forming method characterized in that when stretch forming is performed using forming rolls, the workpiece is simultaneously conveyed in the direction of the rolls while being pressurized and restrained by a hard rubber roll to perform bead forming.