JPS6334743Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a bending device, a so-called bending roll machine, for forming a steel pipe by bending a steel plate.

Regarding a bending device that uses bending rolls to bend steel plates and form them into steel pipes, the applicant has previously filed an application for utility model registration, and the application has been published (Utility Model Application).
54-143860).

As shown in FIG. 1, the bending device according to the above application has two parallel bottom rolls 2 on a bed 1, a top roll 3 arranged above them in parallel, and both ends of the top roll 3 shaped like a portal. It is supported by a frame 4. Both legs 5 of this frame 4 are connected to a guide member 7 by a pivot pin 6.
The frame 4 is rotatably connected to the top roll 3, and the frame 4 rotates around the pin 6 so as to be able to come out from one end of the top roll 3.

Further, the guide member 7 is slidably inserted into a guide groove 8 on the bed 1. Since a reaction force corresponding to the pressing force (vertical load) during molding acts upward on the top roll 3, the guide groove 8 is designed to transmit the reaction force to the bed 1.
For example, it is formed in a dovetail groove.

The guide member 7 is connected to each end of a horizontally moving shaft 9, and has a threaded portion 1 provided at the center of the shaft 9.
0 is engaged with the inner peripheral screw of the boss portion 12 of the worm wheel 11, and the rotating shaft 13 is connected to the worm wheel 11.
By transmitting the rotational force, the frame 4 is moved horizontally via the moving shaft 9. In addition to the above-mentioned vertical load, a lateral load also acts on the top roll 3 (especially when bending the edge of a steel plate), so the reaction force is applied to the top roll 3 by moving the boss 12 of the moving shaft 9 to the bed 1.
It is supported by engaging a part of the

The above-mentioned bending device can reliably support vertical loads and lateral loads, and in particular, the lateral loads are supported by a center-symmetric structure, so it has the advantage of being able to perform bending with high precision. It is desired to improve accuracy.

After further consideration, we found that there are two shafts (pivot pin 6 and moving shaft 9) and the sliding surface of the guide groove 8 between the frame 4 and the bed 1, and there is a possibility of fitting allowance or machining error in these parts. It was found that this caused so-called rattling, making it difficult to improve the machining accuracy of the slide surface in particular, and becoming a problem that hindered the improvement of bending accuracy.

This invention aims to solve the above problems and improve the forming accuracy of steel pipes.

In order to achieve the above object, this invention has a horizontal movement axis passing through both legs of the portal frame so that horizontal movement relative to the frame is impossible, and at least one of the frames has a horizontal movement axis extending through the legs of the portal frame. A gap is provided between the lower end of the frame and the bed so that the bed can rotate around the bed, and both ends of the moving shaft are slidably supported by a part of the bed.

According to the above configuration, the frame moves horizontally as the horizontal movement axis moves, and the reaction force of the lateral load acting on the frame is supported by the bed via the axis. Further, the reaction force of the vertical load acting on the frame is also supported by the bed via the shaft, and at least one frame is actuated to tilt around the shaft and come out of the end of the top roll.

Embodiments of this invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 2 and 3, the device according to this invention has two parallel bottom rolls 21 supported rotatably on a bed 20 by bearings 22. Furthermore, gate-shaped frames 23 and 23' are provided at both left and right ends of the bed 20, and hydraulic cylinders 2 are mounted on the frames 23 and 23', respectively.
4, and its cylinder 24 and frame 23,
A bearing 25 is supported so as to be movable up and down by a vertical guide groove provided in 23', and a top roll 26 is rotatably supported by this bearing 25.

As shown in FIG. 4, a horizontal movement shaft 29 is passed through both legs 27 of the frame 23 via a bearing 28, and the movement shaft 29 is attached to the outer surface of the bearing 28.
The stepped portion 31 forming the boundary with the large diameter portion 30 of 9 is engaged to prevent movement in the horizontal direction relative to the frame 23. Further, the large diameter portion 30 has a keyway 30' and is non-rotatably and slidably supported by a bearing portion 32 having a key 32' protruding from a part of the bed 20.

A threaded portion 33 is formed in the center of the horizontal movement shaft 29, as in the conventional case.
3 is connected to a worm wheel 34. The worm wheel 34 has a boss portion 35 , and an inner circumferential screw provided on the boss portion 35 is screwed to the threaded portion 33 , and both ends of the boss portion 35 are connected to a bearing 36 between the bottom rolls 21 . It comes into contact with a part of the bed 30 via the support plate 30 to support the reaction force corresponding to the lateral load.

The above horizontal movement mechanism is the other frame 23'
The side is similarly configured, and each frame 23,
A worm gear 37 meshed with a worm wheel 34 of 23' is connected by a connecting shaft 38, and one worm gear 37 is connected to a rotating shaft of a motor 39. By rotating this motor 39, the horizontal movement axis 2 of both frames 23, 23' is
9 horizontally in the same direction at the same time.

In addition, one frame 23 is connected to both leg portions 27.
A gap _g1 is provided between the lower end of the bed 20 and the frame 23, and a piston rod 41 of a hydraulic cylinder 40, which is pivotally supported on the outer surface of the bed 20, is pivoted to this frame 23 (see Fig. 2). , Fig. 3). By operating the hydraulic cylinder 40 described above, the frame 23 can be rotated around the movement axis 29 and tilted outward.

Further, as shown in FIG. 5, a sleeve 43 is fitted to one end of the top roll 26 inserted into the top roll support bearing 42 of the frame 23, and a required gap g ₂ is provided between the sleeve 43 and the bearing 42. is provided so that it can be freely pulled out from one end of the top roll 26 or vice versa when the frame 23 is tilted.

As shown in FIG. 2, a drive source 44 and a speed reduction device 45 are provided on the side of the other frame 23', and the driving force is transmitted to the bottom roll 21 via a gear 46. Also, Totsuprol 26
The tip of the arm 47 provided at the end of the bed 20 is connected to a support device 48 provided on the bed 20, thereby maintaining balance on both sides of the frame 23' when one frame 23 is pulled out from one end of the top roll 26. .

Next, the operation of the above device will be explained.

The above device drives the motor 39 to generate the worm 3.
7. When the worm wheel 34 is rotated and the horizontal movement axis 29 is moved in a certain direction, the frames 23, 2
3' moves in the front-rear direction, the top roll 26 can be moved toward one of the bottom rolls 21, and the position of the top roll 26 is appropriately set and the hydraulic cylinder 24 is actuated to perform end bending.

After the end bending is completed, the bottom roll 21 is rotated in the same way as in the conventional case, and the top roll 26 is usually positioned at an appropriate height in the middle of the top roll to form the steel pipe. When forming is completed, the frame 23 is tilted outward by driving the hydraulic cylinder 40, and one end of the top roll 26 slips out of its bearing 42, and the top roll 26 is cantilevered by the other frame 23' and the support device 48. In this state, the formed steel pipe is extracted.

The bending device of this invention is as described above, in which the frame is supported by the bed only through the horizontal movement axis and does not come into surface contact with the bed. Since shaft machining can achieve higher accuracy than surface machining, this invention, which has no surface contact parts, has the effect of allowing highly accurate bending.

In addition, the horizontal movement axis has the function of supporting the frame and transmitting the reaction force against the vertical load and lateral load during molding to the bed, as well as the function of the rotation center axis when the frame is tilted. This also has the effect of simplifying the structure.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of the conventional example, Fig. 2 is a front view of the embodiment, Fig. 3 is a side view of the same, Fig. 4 is a partially omitted vertical sectional view of the same, and Fig. 5 is a longitudinal sectional view of the same. It is a partially omitted longitudinal sectional front view same as the above. 20...Bed, 21...Bottom roll, 22
... Bearing, 23, 23' ... Frame, 24 ...
Hydraulic cylinder, 25...bearing, 26...top roll, 27...leg, 29...horizontal movement axis, 30
...Large diameter part, 31...Step part, 32...Bearing part, 3
3... Threaded part, 34... Worm wheel, 35
... Boss part, 36 ... Bearing part, 37 ... Worm gear, 38 ... Connection shaft, 39 ... Motor, 40 ...
…Hydraulic cylinder, g ₁ …Gap.

Claims (1)

[Scope of utility model registration request] Two bottom rolls are rotatably supported in parallel on the bed, and a top roll is supported in a vertically movable manner parallel to and above the bottom rolls on a gate-shaped frame erected facing each other on the bed. In a steel plate bending device in which each frame is supported movably in the horizontal direction at right angles to the axis of the bottom roll, a horizontal movement axis is passed through both legs of the frame so that horizontal movement relative to the frame is impossible; A steel plate characterized in that a gap is provided between the lower end of both legs and the bed so that at least one of the frames can rotate around the movement axis, and both ends of the movement axis are slidably supported by a part of the bed. Bending equipment.