JPS5928413B2 - Shaft bending device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft object bending device for forming a shaft object such as a pipe into an arc shape.

Conventional shaft object bending devices include a device that wraps the shaft object around an arc-shaped roller (or mold) to shape it, and a device that presses an arc-shaped mold onto the shaft object to form the object. It was equipped with an electric motor or hydraulic cylinder, which provided the forming force.

Therefore, the shapeable shafts are determined by the capacity of the electric motor or hydraulic cylinder, and there is no suitable shaft bending device for thick-walled, squib, and large-sized shafts that require a large forming force. Nakatsuta. An object of the present invention is to obtain a shaft object bending device that can shape a large shaft object into an arc shape using an existing pressurizing device such as a press.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings showing embodiments thereof. Two arms 2 and 3 are arranged symmetrically around a center pin 1, and each arm 2 and 3 is attached to a pin 5 on a base plate 4.
Lever T and 8 are swingably attached by 6 and 6.
and are rotatably connected via pins 9 and 10.

Further, one ends of guide levers 13 and 14 are rotatably attached to the arms 2 and 3 by pins 11 and 12, respectively, and the other ends of the guide levers 13 and 14 are rotatably attached to the shaft 16 of a common guide roller 15. Be connected freely. The guide roller 15 is guided in a guide groove IT provided in the base plate 4 and is movable in the vertical direction. Note that the same lever T) lever 8, guide lever 13, guide lever 14, and guide roller 15 are provided on both sides of the arms 2 and 3. The center pin 1 can be moved forward and backward by a center pin attachment/detachment device 18. The center pin attachment/detachment device 18 consists of a guide sleeve 19 that guides the center pin 1, and a cover 20 attached to the arm 3 (or 2).
A female screw 20a is fixed to the cover 20, and a male screw 1a integral with the center pin 1 is engaged with the female screw 20a. Therefore, by rotating the male screw 1a, the center pin 1 can be moved back and forth. In this manner, the tip of the center pin 1, which can move forward and backward, is engaged with a corresponding hole in the pusher 21. A bending die 22 is attached to the lower end of the pusher 21.
is attached to arms 2 and 3, and bending molds 2 are attached to arms 2 and 3, respectively.
2, opposed flat molds 23 and 24 are attached.
The shaft object bending device with such a configuration is the fixed platen 2 of the brace device.
5 and the movable platen 26, the pusher 21 is placed between the movable platen 2
6, and the base plate 4 is attached to the fixed platen 25. Next, the operation of this shaft bending device will be explained.

First, move back the center pin 1 and press the pusher 21 and arm 2.
, 3 and lift the pusher 21, bending die 2.
2 and the flat molds 23 and 24, the shaft 27 to be formed is set, then the push tool 21 is lowered, the center pin 1 is advanced and engaged with the push tool 21, and the push tool 21 and the arm 2 are moved together. ，
Connect with 3.

When the press device is operated in this state to lower the movable platen 26, the arm 2 gradually swings counterclockwise and the arm 3 clockwise, respectively, and as shown in FIG. is bent and formed. If an unbalance occurs between the left and right arms 2 and 3 during pressurization and, for example, the right arm 2 attempts to swing significantly, the guide lever 13 will also swing and the guide roller 15 will be pressed in the lateral direction of the guide groove 17. Just can't shake. On the other hand, even if the left arm 3 tries to swing greatly, the guide roller 1
5 is only pressed against the guide groove 17 and cannot swing. That is, the arms 2 and 3 are always maintained in a symmetrical positional relationship, and the shaft 2T is symmetrically bent along the bending die 22. Therefore, the shaft 27 can be accurately bent to a predetermined angle, and no excessive force is applied to the press device, which is a press device, so the bending can be performed safely without damaging the press device. I can do it. After the bending is completed, the center pin 1 is moved back to release the connection between the pusher 21 and the arms 2 and 3, and the pusher 2
1 and take out the shaft 27. As explained above, according to the present invention, a bending mold is attached to one end of the push tool attached to one mounting board (the movement board in the above embodiment) of the pressurizing device, and the center is detachable from the push tool. 1 arranged symmetrically to each other so as to be able to swing around the pin.
The pair of arms are connected via swingable levers to the base plate attached to the other mounting plate (fixed plate in the above example) of the pressurizing device. Attach the mold, and connect the other ends of the guide levers, whose ends are swingably connected to both arms and arranged symmetrically to each other, to a common guide roller, and move the guide rollers along the line of symmetry of both guide levers (see above). In the example, the shaft object bending device was constructed by guiding the shaft object so that it moves along the soil direction (underground direction), so it is possible to bend and form shaft objects such as large pipes using an existing pressurizing device. Since large forming force can be obtained, cold working is possible.

Furthermore, a guide link consisting of a guide lever and guide roller is provided, so the forces of the left and right arms are always balanced.
Since no unreasonable force is applied to the pressurizing device and the shaft is formed symmetrically along the bending mold, highly accurate bending can be performed. In addition, a wide range of shaft objects can be bent by simply exchanging the bending die and the flat die.

[Brief explanation of drawings]

FIG. 1 is a front view of the shaft object bending device according to the present invention, FIG. 2 is a side view of the shaft proboscis bending device shown in FIG. 1 (the right half is shown as a sectional view), and FIG. FIG. 3 is a front view showing a state in which the shaft object bending device shown in FIG. 1... Center pin, 2, 3... Arm, 4... Base plate, 7, 8...
・Lever 13, 14...Guide lever, 15
...Guide roller, 17...Guide groove, 18...Center pin removal device, 21...
...Usage, 22...--Bending mold, 23,24--
... Flat type, 25 ... Fixed plate, 26 ...
...Movable plate, 27...Shaft object.

Claims (1)

[Claims] 1. In a shaft object bending device that uses a pressure device such as a brace to bend and form a shaft object into an arc shape, a bending die is attached to one end of the push tool attached to one mounting plate of the pressure device, and the bending die is attached to one end of the push tool. A pair of arms arranged symmetrically so as to be swingable about a removable center pin are each connected to a base plate attached to the other mounting board of the pressurizing device via a swingable lever, A flat mold is attached to each arm opposite to the bending mold, one end of which is swingably connected to each arm, and the other end of a guide lever arranged symmetrically to each other is connected to a common guide roller. A shaft object bending device characterized in that a guide roller is guided so as to move along a line of symmetry between both guide levers.