JPS63192518A - Vendor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bender used when bending a member such as a pipe to a predetermined curvature.

[Prior Art] Various structures have been proposed as this type of vendor. Among them, the first one is representative.
Examples include those shown in the figure. This bender includes a fixed roll 3 that is rotatably supported on a base 1 and has a groove 3a with a semicircular cross section on its outer circumferential surface that is machined to match the outer diameter of a pipe 2, and a fixed roll 3 that is rotatably supported on a base 1. An arm-like member 5 rotatably held on the roll shaft 4 of the fixed roll 3; 3 and a presser roll 6 that revolves while rotating on its axis. Further, a groove 6a having a semicircular cross section in accordance with the outer diameter of the pipe 2 is also formed on the outer peripheral surface of the presser roll 6. By sandwiching the pipe 2 between this groove 6a and the groove 3a of the fixed roll 3 and rotating the arm-like member 5 in a predetermined direction (arrow A direction), the pipe 2 can be bent to a predetermined curvature. It looks like this.

[Problems to be solved by the invention] By the way, for vendors formed as described above)
Every time the bending angle of the pipe changes, a fixed roll that matches the bending angle becomes necessary. However, conventional commercially available fixed rolls have a limited number of curvature types, and therefore only a limited number of curvatures can be obtained that are restricted by the fixed roll. Therefore, if you want to obtain a fixed roll with a different curvature, you will have to make a new fixed roll by special order each time, which is extremely costly and takes a relatively long time to obtain the fixed roll. It took several days to process.

Therefore, the object of the present invention was made in view of the above-mentioned points, and the purpose of the present invention is to provide a thin plate-shaped bending jig in place of the conventional fixed roll.
Furthermore, by providing a presser jig that has both the functions of a fixed roll and a presser roll, it is an object of the present invention to provide a bender that can produce products with various curvatures at low cost and in a short time.

[Means for Solving the Problems] The bender of the present invention includes a thin plate-like bending jig having a curved part formed with a predetermined curvature on a part of the outer periphery, and a bending jig having a curved part formed with a predetermined curvature on the bending jig. It consists of a plate that is rotatably attached to the center of curvature and extends in the radial direction, and a presser jig that is a two-part body that is attached to the plate at a portion that intersects with the curved part, and the presser jig is The bending jig is characterized in that it is configured to sandwich the curved portion of the bending jig from above and below, and that a forming space for holding the periphery of the member to be bent is formed in the dividing surface thereof.

[Function of the Invention] The bending jig related to the bender of the present invention is manufactured by cutting a thin plate-like material to form a curved part with an arbitrary curvature. In addition, the holding jig is a two-part body, and when the curved part of the bending jig is held between these two parts, a molding space approximately equal to the outer diameter of the bent member is formed on the divided surface by the curved part and both divided bodies. be done. In addition, on the bending jig, a plate extending in the radial direction is rotatably attached to the center of curvature of the curved part, and a holding jig is attached to the part of this plate that intersects with the curved part. There is. Therefore, the forming space is located along the curved portion of the bending jig.

Therefore, when a member to be bent, such as a pipe, is passed through the forming space of the holding jig, and then the plate and the holding jig integrated therewith are rotated in a predetermined direction, the member to be bent, such as a pipe, is moved into the bending jig. It can be bent along the curved part.

[Embodiment] FIGS. 2 and 4 are diagrams showing an embodiment of a vendor according to the present invention. As shown in FIGS. 2 and 3, the bending jig 10 has a thin plate shape and is made to have a semicircular shape in plan view, and is fixed to a base (not shown) via a stay 11. There is. The bending jig 10 of this embodiment is manufactured by cutting a steel plate with a thickness of about several mm into a semicircular shape. Further, its outer peripheral surface portion is a curved portion 10a formed with a predetermined curvature. Note that the radius of curvature of this curved portion 10''a (as shown in FIG. 2, the distance R from the position of the center of curvature 12 to the curved portion 10a) is set to be the minimum bending radius of the pipe 13, which is the member to be bent. A pipe holder 14 is fixed to one end of the straight portion 10b of the bending jig 10.

On the other hand, at the position of the stay 11 of the bending jig 10, an elongated plate 16 is rotatably attached via an attachment hole 15. A plurality of these mounting holes 15 are provided at regular intervals in the length direction of the plate 16, and each can be rotatably mounted to the position of the stay 11 of the bending jig 10 via a screw or the like. There is. Further, a presser jig 17 is fixed to one end of the plate 16. As is clear from FIGS. 3 and 4, this holding jig 17 is composed of blocks 18 and 19 divided into upper and lower sections. These blocks 18 and 19 are vertically symmetrical, and a groove 18a with a semicircular cross section is formed on the dividing surface 17a of both blocks.
, 19a are formed. Therefore, when both are put together, a molding space 20 that can embrace the outer periphery of the pipe 13 is formed. Therefore, the hole diameter of the molding space 20 is set to be the same as the outer diameter of the pipe 13. Note that the mounting hole 14 of the plate 16 is mounted at the position of the stay 11 of the bending jig 10 so that the center position of the molding space 20 and the center position of the pipe 13 coincide.

Also, from the molding space 20 of blocks 18 and 19, plate 1
At a position on the rotation center side of No. 6, a step is formed on the dividing surface. This step corresponds to a dimension t corresponding to half the thickness of the bending jig 10. Therefore, a part of the blocks 18 and 19 can sandwich the bending jig 10 from above and below, and at this time, the curved part 10 of the bending jig 10
The tip of a faces the molding space 20. Further, while the bending jig 10 is being held between the holding jig 17 and the bending jig 10, the holding jig 17 can be rotated without sliding on the bending jig 10 around the center of curvature 12. Therefore, the molding space 20 can be moved along the curved portion 10a of the bending jig 10. Therefore, this presser jig 17 functions not only as a conventional presser roll but also as a fixed roll. Note that the block 18 is attached to the plate 16 with bolts 21 in advance. Further, a lever 22 is connected to one end side of the presser jig 17.

A presser jig attachment portion 23 is provided at one end of the lever 22, and the blocks 18 and 19 are fastened together with bolts 24 here.

Next, the bending process of the pipe 13 will be explained.

First, a predetermined bending jig 10 is manufactured by cutting a thin plate according to the curvature of the pipe 13, and this is fixed on a base. Next, the plate 16 to which the presser jig 17 has been connected in advance is rotatably attached to the stay 11 of the bending jig 10 through the attachment hole 15 thereof. In this case, the plate 16 is provided with a plurality of mounting holes 14, but the presser jig 17
The mounting hole 14 is selected so that the center of the molding space 20 coincides with the center of the pipe 13, and the mounting hole 14 is mounted to the stay 11 of the bending jig 10.

Note that the plate 16 and the presser jig 17 are set in a state where they are rotated approximately 90 degrees clockwise relative to the solid line state shown in FIG. After setting in this manner, the pipe 13 is inserted a predetermined amount through the molding space 20, and then the plate 16 and the holding jig 17 are rotated counterclockwise (in the direction of arrow B) about the center of curvature 12. If the pipe 13 is bent, the pipe 13 is bent to the curved portion 10a of the bending jig 10, and a predetermined curvature can be obtained. At this time, since the curved portion 10a is held between the blocks 18 and 19, there is no risk of deformation or the like.

In this embodiment, since a large number of mounting holes 14 are formed in the plate 16, the same holding jig 17 can be used even when changing the curvature of the pipe 13.

That is, in such a case, first select a bending jig 10 suitable for the curvature of the pipe 13. And this bending jig 1
0 to the base, attach the plate 16 to the mounting hole 1.
4 to the stay 11 of the bending jig 10. At this time, a mounting hole 14 is selected so that the center of the molding space 20 of the holding jig 17 and the center of the pipe 13 match, and the plate 16 is attached to the stay 11 of the bending jig 10 through the mounting hole 14. Install. After that, the pipe 13 may be bent to a predetermined curvature by the same operation as described above. In this way, various curvatures can be formed using the same holding jig 17, which is extremely convenient. In the above-described embodiment, the pipe '13 is used as the bent member, but it goes without saying that the bending member is not limited to this.

[Effects of the Invention] According to the bender of the present invention, the bending jig is made of a thin plate-like member, and the curvature of the bending jig is adjusted by using the presser jig, which has both the functions of a conventional fixing roll and a presser roll, through a plate. By attaching it rotatably at the center, a member to be bent such as a pipe can be bent to a curvature that matches the bending jig. Therefore, even if it is desired to form a curvature to a curvature that is not available on a commercially available fixed roll in a conventional roll bender, according to the present invention, a bending jig can be manufactured each time or in advance from a thin plate-like member. Therefore, in the above case, with the conventional roll bender,
Although fixed rolls must be specially ordered, the processing time can be greatly reduced. Therefore, even in such a case, the desired curvature can be formed at low cost and in a short time.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional bender. 2 to 4 show examples, in which FIG. 2 is a plan view of the bender, FIG. 3 is a side view thereof, and FIG. 4 is an enlarged sectional view of the main part. (Explanation of symbols) 10...Bending jig, 10a...Curved part, 12...
Center of curvature, 13...Pipe, 15...Mounting hole, 1
6... Plate, 17... Presser jig, 18.19.
...Block (divided body), 20...Molding space.

Claims (1)

[Claims] a thin plate-like bending jig having a curved part formed with a predetermined curvature on a part of its outer periphery; and a bending jig rotatably attached to the center of curvature of the curved part on the bending jig and extending in the radial direction. It consists of a plate and a holding jig which is a two-part body attached to a portion of the plate that intersects with the curved part, and the holding jig is configured to pinch the curved part of the bending jig from above and below. A bender characterized in that a molding space for holding the periphery of a member to be bent is formed in the dividing surface thereof.