JPS6225056B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to forming equipment, particularly to a cage roll forming apparatus for forming electric resistance welded tubes.

[Prior art]

It is necessary to rearrange the rolls in molding equipment, especially in the electric resistance welded tube manufacturing line, in response to changes in molding size. The forming rolls used in the front and middle areas of the forming line are heavy and numerous, so there are problems in that it is difficult and time-consuming to replace the rolls, and equipment costs are high. In order to alleviate these problems, Japanese Patent Publication No. 45-29896 discloses that two groups of relatively small diameter forming rolls are arranged on the inclined straight path 16 and can be adjusted in the width direction and the vertical direction by moving them up and down along the inclined surface. An example is shown in FIG. 1. Also, Jitsukō 46-28897
In the publication, relatively small-diameter forming rolls 2 are arranged separately into a lower roll group and an upper roll group, and the left and right pair of lower roll groups supported side by side in the line direction can be opened and closed in the line width direction, and can be opened and closed in the vertical direction. A lifting device is disclosed (an example is shown in FIG. 2). However, in all of these devices, the pedestal 17 that holds the forming roll 2 is installed on a base frame 18 fixed to the foundation, so in the case of a forming device that handles a wide size range, forming from the base frame 18 is required. The distance to the roll 2 is longer, that is, the height of the pedestal 17 is increased, and the pedestal deformation due to the reaction force during molding is large.This is especially applicable when molding small-sized thick-walled materials that generate a large reaction force during molding due to lack of rigidity. The drawback was that I couldn't do it.

[Purpose of the invention]

The purpose of the present invention is to use a relatively small-diameter forming roll 2 so that even if the forming size changes, the forming roll 2 can be used in a wide range of sizes without having to be replaced, thereby reducing equipment costs and further reducing the work time required for changing rolls. It is an object of the present invention to provide equipment that eliminates the need for molding and has high rigidity that can sufficiently withstand the molding reaction force even when molding small-sized thick-walled materials.

[Structure of the invention]

The structure of the present invention is that relatively small-diameter rolls are arranged symmetrically in a row at short pitches in the line direction, and the left and right roll groups are supported independently and symmetrically on roll support beams 5 that are tilt-adjustable. The support beam is attached to an opening/closing mechanism that adjusts its advance and retreat in the direction perpendicular to the line to form a side forming roll assembly. Further, a roll that supports the center portion of the molding material and has an elevating mechanism is used as a lower roll assembly. These two assemblies are arranged in one frame-like frame 12, and the frame 12 is supported by a lifting device 13 so that its height can be adjusted.

[Action of the invention]

With the above configuration, the present invention can accommodate a wide range of molding sizes by adjusting the position of the rolls without replacing the molding roll 2 even when changing the molding size, and has a high molding reaction force even when molding small-sized thick materials. It can ensure sufficient rigidity to withstand high temperatures and can be molded with good precision.

〔Example〕

Hereinafter, the present invention will be explained based on examples of pipe forming shown in the drawings. Fig. 3 is a perspective view showing the entire cage roll stand, Fig. 4 is a front view seen from the direction in which the molding material enters, Fig. 5 is a side view, and Fig. 6 is a side view.
The figure is an enlarged cross-sectional view taken along the line A-A of the width adjusting mechanism of the side forming roll 2 shown in FIG. 5, and FIG. 7 is an enlarged cross-sectional view of the lifting mechanism of the lower roll.

The molding material 1 is formed into an arc shape as shown in FIG. 4 by an initial molding device installed on the inlet side of the device, and then supplied to the device. The side forming rolls 2 are arranged symmetrically and set so that the distance between the left and right rolls gradually decreases in the line direction from the entry side to the exit side.The lower roll 3 usually has a larger pitch than the side forming rolls 2. Multiple pieces are arranged in the line direction. The molding material 1 is pushed into the roll space formed by the side molding rolls 2 and the lower roll 3, and as it passes through the roll space set to gradually decrease in the line direction, the molding of the material gradually progresses as the material advances.

The side forming roll 2 is pivotally attached to a yoke 4, and the yoke 4 has a turnbuckle 6 attached to a roll holding beam 5 disposed in the line direction so as to be able to adjust the angle.
It is attached via the shaft. The roll holding beam 5 is pivotally attached to a bracket 8 via a shaft 7 so that the gap between the side forming rolls can be adjusted as the pipe manufacturing size changes, and is connected to a reciprocating device 9 provided on the back side of the bracket 8. It therefore serves its purpose by moving within the guide groove 10. In order to configure it like this,
The height of the point of contact between the material and the rolls, that is, the point of application of the forming reaction force, is at a short distance from the guide groove 10, and therefore the reaction force support system has sufficient rigidity against the reaction force during pipe making.

In order to adjust the height of the lower roll 3 due to factors such as changing the pipe manufacturing size or downhill forming method, the lower roll 3 is housed in a roll chock 11, and the roll chock 11 is raised and lowered into a guide frame 12' provided on the frame 12. stored as possible. The roll level of the roll unit composed of the lower roll 3 and the roll chock 11 is adjusted to a predetermined position by a lifting device 13 disposed below the guide frame 12' of the frame 12.

All of the above-mentioned structures are arranged on the above-mentioned frame 12, and this frame 12 is pivoted to support frames 14, 14' installed on the foundation via a lifting device 15, and the pass line is adjusted. In addition, it is configured so that the inclination angle can be freely adjusted with respect to the line advancing direction, so even in the case of downhill molding, by using it in combination with the height adjustment of the lower roll 3, it is possible to achieve a proper downhill and proper roll. You can get the settings.

By configuring the present invention as described above, it is possible to appropriately set the pass line level and roll, and to provide a molding apparatus with high rigidity and high precision.

In addition to the structure and mechanism described in this embodiment, the following method can also be adopted.

1. Although each roll is shown as being non-driven, it may be of a driven type.

2. A lining roll may be provided to mold the material from the inside, and a presser roll may be provided to press the material against the lower roll in order to increase the stability of the material being conveyed.

3. The lower roll may be V-shaped (FIG. 8) or segmented (FIG. 9).

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional device, Fig. 2 is a front view of another conventional device, Fig. 3 is a perspective view of the entire molding stand, Fig. 4 is a front view as seen from the direction in which the material enters. Fig. 5 is a side view, Fig. 6 is an enlarged sectional view of the side forming roll width adjustment device, Fig. 7 is an enlarged sectional view of the lower roll lifting device, Fig. 8 is the V-shaped lower roll,
FIG. 9 shows a split lower roll. 1: Molding material, 2: Side forming roll, 3: Lower roll, 4: Yoke, 5: Roll holding beam, 6: Turnbuckle, 7: Shaft, 8: Bracket, 9: Advance/retreat device, 10: Guide groove, 11: roll,
12: Frame, 13: Lifting device, 14: Support frame, 15: Lifting device, 16: Inclined straight passage, 1
7: Frame, 18: Base frame.

Claims (1)

[Claims] 1. A frame 12 formed of four sides is pivotably installed on the upper part of an elevating device 15, which is installed in two assemblies at the front and rear in the direction of movement of the material, and among the four sides of this frame 12,
A roll chock 11 connected to a lower roll elevating device 13 is provided on two sides in the forward and rearward direction of the material so that it can be raised and lowered.
At the same time, an advancing/retracting device 9 is arranged on both sides of the frame 12, and a holding beam 5 is connected to this advancing/retracting device 9 so that the holding beam 5 can be moved in the horizontal direction. A molding stand with an upper roll 2 disposed through it.