JPH07290152A - Setting method of roll forming machine and device therefor - Google Patents

Abstract

PURPOSE:To produce a formed part excellent in dimensional precision by setting a roll gap and then setting a roll so that the load is fixed. CONSTITUTION:An upper roll 1 is supported on a upper roll shaft 7 through a roll holder 3 by a roll chock 5. A lower roll 2 is supported on a lower roll shaft 8 through a roll holder 4 by a roll chock 5. By turning either of the upper or lower roll 1, 2 toward advancing direction, rolling is executed. At this time, a roll gap is set and then the roll is set so that the load is fixed. A screw down mechanism 9 is arranged above the upper roll shaft 7, a push up cylinder 11 for hydraulic reduction is arranged under the lower roll shaft 8. By this method, changing of roll can be eliminated so as to produce in high productivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll forming machine setting method and setting apparatus.

[0002]

2. Description of the Related Art When roll forming a material,
Since the roll has to be replaced every time the size such as the outer diameter and the wall thickness changes, various methods have been devised to eliminate the roll replacement and allow size-free molding with size sharing.

In a roll forming machine for producing products such as pipes, there are the following methods for providing size sharing such as outer diameter and wall thickness. JP-A-62-16
In the method disclosed in Japanese Patent No. 6027 in which the roll is tilted in a plane perpendicular to the traveling direction of the plate, the lower roll 21 is separated and parallel to the outside when the outer diameter is large and the plate width is large as shown in FIG. While moving, the upper roll 22 moves outward while tilting the upper part inward (FIG. 1a), and when the outer diameter is small and the plate width is small, the lower roll 21 is moved in parallel in a direction in which the lower roll 21 is in close contact. The upper roll 22 is moved inward while tilting the upper part outward (FIG. 1b). The commonality of wall thickness will be dealt with by adjusting the inclination angle of the upper roll.

In an edge bending method as disclosed in Japanese Patent Laid-Open No. 60-24220, the roll is moved in the width direction so as to have commonality, in the case where the outer diameter is large and the plate width is large as shown in FIG. For the lower roll 21, the inner one of the two types of hole type is used, and when the outer diameter is small and the plate width is small, the outer type of the two types of lower roll 21 is used.
The commonality of the wall thickness is adjusted by the inclination angle of the upper roll 22, and when the wall thickness is thick, it is set up, and when the wall thickness is small, it is tilted.

Japanese Patent Application Laid-Open No. 64-44217, Japanese Patent Application No. 3
No. 2,308,817, a few lower rolls 21
In the method of inclining, the lower roll is inclined in the plate advancing direction with respect to the commonality of the wall thickness, as shown in FIGS. 3 (a) and 3 (b). In addition, as in Japanese Patent Application No. 4-55207 and Japanese Patent Application No. 4-67192, upper and lower rolls 22, 21.
A method of turning the vehicle (see FIG. 4) is also conceivable. In this method, the contour line of the roll projected in the traveling direction of the material is changed by the rotation of the roll, so that the outer diameter and the wall thickness are shared.

In these size-free moldings, as the size is shared, the number of movable parts is increased as compared with the conventional method in which rolls are exchanged for each size. Therefore, the occurrence of backlash is increased, so that the molding curvature and the wall thickness accuracy are improved. There is a problem that it is difficult to secure. Among these technologies, the method of rotating the roll has high commonality, but since the configuration is particularly complicated, there are problems that the number of parts increases and the cause of backlash increases, and it is difficult to secure rigidity. The amount of change in the gap is large, and the conventional method of setting the roll position causes a large change in wall thickness due to a setting error.

[0007]

Among the roll-forming machines that can be used for all sizes, in the roll-rotating type roll-forming machine, the roll setting gap becomes relatively small as the roll position changes, and the molded product is crushed. Then, a large dent is generated. An object of the present invention is to provide a size-free roll forming machine setting method and apparatus in which the influence of roll position setting error is mitigated.

[0008]

The present invention achieves the above object by controlling the load of a roll.
(1) In a roll forming machine in which upper or lower rolls are rotated with respect to the traveling direction, a roll gap is set, and
A roll setting method for a roll forming machine, characterized in that the roll is set to have a constant load, and (2) a screw reduction mechanism is provided above the upper roll shaft and a hydraulic pressure push is provided below the lower roll shaft. A roll forming machine having an up cylinder.

[0009]

In the roll swivel type roll forming machine described above, an error in the roll position is likely to occur, and the method of setting the roll position has a problem that the formed product is crushed due to the generated roll position error. In the present invention, by setting the roll forming load, the influence of the roll position error that has occurred is mitigated to prevent the collapse of the formed product.

The roll forming machine normally sets the roll to the command position, but in the present invention, the roll is set to the command load. As for the forming load, it was found that the increase of the load is large when the crushing is involved, since the forming is mainly bending. FIG. 5 shows changes in load and crush with changes in roll gap. The horizontal axis of the figure is the roll gap, which is changed from +1.5 mm to -1.5 mm with reference to the material plate thickness t. Further, the forming load is shown as a ratio based on the load when the roll gap is set to the material plate thickness t.
The crush indicates the plate thickness of the crushed portion with respect to the material plate thickness.
From the figure, it can be seen that the load increases rapidly with the occurrence of crushing. Therefore, if a load that does not cause crushing before the rapid increase of the molding load is obtained and set to this load, the product can be molded without crushing and molding curvature.

As a device for setting the molding load, a pressure-reducing device (push-up or push-down) by hydraulic pressure or air pressure is incorporated in the roll forming machine, and the roll is applied to the molding load determined by the above method by using this pressure-reducing device. By setting, the product can be molded without crushing and lack of molding curvature. That is, as shown in FIG. 6, the reduction device 11 may be provided below the lower roll shaft 8 and pushed up to make the load constant.

In FIG. 6, reference numeral 1 denotes an upper roll, which is supported by an upper roll shaft 7 by a roll chock 5 via a roll holder 3. A lower roll 2 is supported by a lower roll shaft 8 by a roll chock 5 via a roll holder 4. 9 is a screw reduction mechanism provided on the upper part of the roll shaft, and 11 is a push-up cylinder for hydraulic reduction provided on the lower part of the lower roll shaft. Instead of FIG. 6, a push-down cylinder may be provided on the upper part of the upper roll to control the load to be constant.

[0013]

EXAMPLES Next, examples of the present invention will be described. Figure 6
A steel pipe was formed using the roll-swivel type roll forming machine shown in FIG. This molding machine is a vertical roll turning type and has a hydraulic pressure reduction cylinder 11 for constant load control.
As an example, a steel pipe was manufactured. The roll turning type roll forming machine was installed in the first stage of the pipe forming machine to perform roll forming. The upper and lower rolls of the roll forming machine installed in the first stage were cross-swirled, and the swivel angle of the upper roll was 15 ° and the swivel angle of the lower roll was also 15 °. STK400 is used as the material and the wall thickness is 5
A target outer diameter of 50.8 mm was formed using a material of mm. The curvature / thickness distribution of the edge portion of this steel pipe is shown in FIG. FIG. 7 also shows the values obtained by the conventional method. As is apparent from the figure, it can be seen that the present invention enables molding without crushing and lack of molding curvature.

[0014]

EFFECTS OF THE INVENTION According to the present invention, it is possible to eliminate the need for roll replacement by providing size commonality such as outer diameter and wall thickness, thereby enabling high-efficiency production. Further, it is possible to manufacture a molded product having excellent dimensional accuracy without crushing and lack of molding curvature.

[Brief description of drawings]

1A and 1B are explanatory views of a size-free forming roll.

FIG. 2 is an explanatory view showing another type of size-free forming roll.

FIG. 3 is an explanatory view showing another type of size-free forming roll.

FIG. 4 is an explanatory view of a vertical roll turning type roll forming machine.

FIG. 5 is a diagram showing changes in load and crush with changes in roll gap.

FIG. 6 is a view showing an example of a load control system vertical roll turning type common stand of the present invention.

FIG. 7 shows the curvature and wall thickness distribution from the edge end in steel pipe manufacturing.

[Explanation of symbols]

 1 Upper Roll 2 Lower Roll 3 Upper Roll Holder 4 Lower Roll Holder 5 Upper Roll Chock 6 Lower Roll Chock 7 Upper Roll Shaft 8 Lower Roll Shaft 9 Screw Reduction Mechanism 10 Forming Plate 11 Hydraulic Push Down Cylinder 21 Lower Roll 22 Upper Roll

Claims (2)

[Claims] 1. A roll forming machine for rotating upper or lower rolls with respect to a traveling direction, wherein a roll gap is set and the rolls are set so that a load is constant. Method. 2. A stand having an upper roll shaft supporting an upper roll and a lower roll shaft supporting a lower roll, wherein a screw reduction mechanism (9) is provided on an upper part of the upper roll shaft (7), and the lower roll shaft (8) is provided. ) Is provided with a hydraulic pressure push-up cylinder (11) below the roll forming machine.