JPS5838614A - Working method for hemming of circular ring made of metallic sheet - Google Patents

Abstract

PURPOSE:To prevent the generation of wrinkles and to improve the forming accuracy in bending the peripheral end part of a circular ring, by clamp-pressing the metallic circular ring between a circular ring driving roll equipped with a working roll and a circular ring driving roll equipped with a cushion roll. CONSTITUTION:A work 13 is put between an outside work-driving roll 3 and an inside work-driving roll 4 rotating at the same speed. Next, the work 13 is pressed between a top and bottom surface processing work roll 1 of the roll 4 and a top and bottom surface processing cushion roll 2 of the roll 3, and the roll 1 is pushed forward to the direction of the roll 2 against the resistance of a definite pressure of the roll 2. Then, a peripheral edge processing part of the roll 1 is pushed forward to the peripheral edge-part of the roll 3 with retreat of the roll 2, to press the clamped top and bottom end parts of the periphery of the work 13 to the outside direction, thereby performing an automatic hemming at a stroke. Further, in a case of hemming the peripheral top and bottom parts of the work 13 to the inside direction, the driving rolls 3 and 4 and working rolls 1 and 2 are rearranged properly, or the design is changed at one's option.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic edge bending method for a circular ring made of a flat metal plate. Furthermore, the present invention aims to provide edge-bent products with larger processing limits, fewer wrinkles, and higher accuracy than conventional methods, at a relatively low price. The details will be explained below with reference to the attached drawings.

The attached drawings show an embodiment in which the upper and lower ends of the circumference of a workpiece are bent outward, such as a rim, in the method of edge bending a circular ring made of a flat metal plate (hereinafter referred to as "Waichi") of the present invention. It is something that

And 1 in the figure. 1 shows processing rolls provided on the upper and lower surfaces of the inner work drive roll 4, and on each inner surface of the periphery of the processing roll 10, a processing portion is formed in accordance with the shape of the processing roll.

2 has a machining shape corresponding to the shape of the machining part on the inner surface of the periphery of the work roll 10 for driving the workpiece at the outer side. Bend the edges to the desired shape. Note that the inner and outer work drive rolls 3.4 rotate at the same circumferential speed to drive and rotate the clamped work at a predetermined speed.

5 is a cylinder for work drive roll 4, 6 is a cylinder for processing roll 1/-17Fi cylinder for sewing roll 2, 8 is a motor for processing roll 1, 9 is a motor for sewing roll 2, 10 is a nerg for sewing roll 2 , 11
A μ oil bath, l2 is a control panel, and 13 is a workpiece.Next, the edge bending method of the present invention using the above device will be explained.

A workpiece 13 is placed between an outer workpiece drive roll 3 and an inner workpiece drive roll 4 that rotate at the same circumferential speed (@Figure 3a). A workpiece 13 is placed between the processing roll 1 on the upper and lower surfaces of the driving roll 4 and the cushion roll 2 on the upper and lower surfaces of the driving roll 3. Then, as the cushion roll 2 retreats, the peripheral edge processing section of the processing roll 10 is pushed against the circumference g& of the drive roll 3, and presses the upper and lower ends of the circumference of the workpiece 13 that has been sandwiched in an outward direction to remove wrinkles. Perform automatic edge bending all at once while preventing this from occurring (Fig. 3C). Note that the shape of the edge curve can be freely set depending on the shape of the processed portion provided on the peripheral edge of the processing roll 1 and the shape of the corresponding peripheral edge of the drive roll 3. Although not shown in the drawings, when the upper and lower ends of the circumference of the workpiece 13 are bent inward, the workpiece drive rolls 3.4 and processing rolls 1. The purpose of the present invention can be easily achieved by appropriately rearranging the cushion roll 2 and other arbitrary design changes without changing the gist of the present invention. (In the present invention, a circular ring made of a flat metal plate is sandwiched between a circular drive roll equipped with a processing roll that rotates at the same circumferential speed and a circular drive roll equipped with a cushion roll, and is driven and rotated at a constant speed. However, the edge bending of the circular ring made of a flat metal plate is carried out at once by the suppressing action of the processing roll and the cushion roll at the circumferential end 1C of the driving rotating circular ring, so it is different from the conventional processing method. By pressing the circular ring of the cushion roll during processing, the occurrence of processing wrinkles is prevented, and the processing limit is larger, and processing precision is improved, which provides special effects not seen before. .

[Brief explanation of drawings]

The attached drawings show Embodiment 2 of the present invention; FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is an enlarged front view of the pipe section showing the processing order, and FIG. 4 is an enlarged plan view of the main part. It is a diagram. 1... 7-1 Processing roll, 2... Cushion roll, 3... Outer part work drive roll, 4... Inner part work drive roll, 13... Work. 1 person allowed Shigeru Kodama

Claims (1)

[Claims] Circular knitting t1 made of a metal flat plate is sandwiched between a circular drive roll equipped with a processing roll rotating at the same circumferential speed and a circular drive roll equipped with a cushion roll, and the processing roll is rotated at a constant speed. A method for edge bending a circular ring made of a flat metal plate, characterized in that the circumferential edge of the clamping circular ring is automatically bent outward or inward at once by the pressing action of a bushing and a roll. .