JPH0152092B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pipe bending device, in particular a linear support portion for placing a pipe to be bent and a curved portion curved in accordance with the shape to be bent. a bending die having a positioning groove on its upper surface that is continuous with the bending die; a pad for pressing and supporting the pipe on the support portion toward the bending die; The present invention relates to a pipe bending device including a bend punch that is driven up and down.

Conventionally, such pipe bending equipment has generally been equipped with dedicated bend dies and bend punches depending on the type and bending shape of the pipe to be bent, that is, the bending position, bending angle, depth, etc. Not only was it necessary to manufacture and prepare a bend punch, but there were also problems such as requiring a long time to change the mold.

The present invention has been made in view of the above circumstances, and can quickly deal with changes in the type and bending shape of pipes to be bent, and can reduce the number of bend dies and bend punches that must be prepared. It is an object of the present invention to provide a pipe bending device that does the following.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, a pipe P to be bent is placed in a positioning groove 2 of a bending die 1, and a pad 3 presses and supports the pipe P. At the same time, by pressing the pipe P with the bend punch 4, the pipe P is bent.

Referring also to FIG. 2, the bend die 1 is detachably and movably fixed on the base 5. That is, the lower end of the bend die 1 is integrally provided with an outwardly protruding flange 6, and the bend die 1 is fixed on the base 5 by bolts 7 that vertically pass through the flange 6. Ru. Moreover, a pair of elongated holes 8 and 9 extending along the longitudinal direction of the positioning groove 2 are bored in the base 5, and the elongated holes 8,
Engagement grooves 10 and 11 communicating with the lower end of the base 5 are bored in the side surface of the base 5. Each bolt 7 is inserted into an elongated hole 8, 9, and the engaging groove 10, 11 is inserted into the elongated hole 8, 9.
Nuts 12 are screwed onto the ends of the bolts 7 that protrude from each other. Therefore, by loosening the nut 12, the bend die 1 can be moved along the long holes 8, 9, that is, the positioning groove 2. Furthermore, by releasing the threaded state of the nut 12 onto the bolt 7, the bend die 1 can be removed from the base 5.

The positioning groove 2 is carved on the upper surface of the bending die 1, and consists of a straight support part 13 and a curved part 14 curved in accordance with the shape to be bent, which are connected in a parallel manner within the creeping surface. , its cross-sectional shape is approximately U-shaped corresponding to the lower half of the pipe P.

An elevating table 15 that is driven up and down by a drive device (not shown) such as a hydraulic device is arranged above the base 5, and a support frame 16 is integrally provided on the lower surface of this elevating table 15. . This support frame includes a pair of support columns 17 and 18 suspended from the lower surface of the lifting platform 15 at positions spaced apart from each other along the longitudinal direction of the positioning groove 2 in the bend die 1, and the lower ends of the support columns 17 and 18. and a connecting portion 19 that connects the. Between the upper and lower surfaces of the connecting portion 19,
A guide hole 20 extending in the longitudinal direction is bored, and the guide hole 20 is provided with a pair of step portions 21 and 22 facing downward on both sides of the guide hole 20 in the width direction. On the other hand, both ends of a threaded rod 23 extending parallel to the longitudinal direction of the guide hole 20 are rotatably supported on both the support sections 17 and 18.
A rectangular protrusion 24 protruding outward from 7 is concentrically provided. A spanner or the like can be engaged with this protrusion 24, whereby the threaded rod 23 is rotationally driven. Furthermore, as shown in FIG.
A screw member 25 is screwed into the screw rod 7, and by engaging the tip of the screw member 25 with an engagement hole 26 provided at one end of the threaded rod 23 at intervals in the circumferential direction, the screw can be screwed. Rotational movement of rod 23 is prevented.

A punch holder 27 is mounted on the support frame 16 so as to be movable along the longitudinal direction of the positioning groove 2 . That is, the punch holder 27 has a support flange 28 that slides into both step portions 21 and 22 of the guide hole 20,
29 on both sides, and is slidably fitted into the guide hole 20.
Moreover, the length of the punch holder 27 is set shorter than the length of the guide hole 20, and the punch holder 27 is slidable within the guide hole 20 along its longitudinal direction. Support arms 30 and 31 are integrally provided upwardly projecting from the upper portions of both longitudinal ends of the punch holder 27, and a threaded rod 23 is screwed into the middle of these support arms 30 and 31. Therefore, the punch holder 27 is suspended and supported by the threaded rod 23, and its rotational movement about the threaded rod 23 is prevented by the guide hole 20, so that the punch holder 27 rotates in response to the rotational movement of the threaded rod 23. , the punch holder 27 slides along the guide hole 20.

The punch holder 27 has a through hole 3 extending vertically at a position corresponding to the support part 13 in the bend die 1.
2 is bored, and a step 33 facing downward is provided in the middle of the through hole 32. A support rod 34 is inserted through the through hole 32 so as to be vertically movable, and a stopper portion 35 that can come into contact with the punch holder 27 is integrally provided at the upper end of the support rod 34 . Furthermore, a male thread 36 is provided at the lower end of the support rod 34, and this male thread 36 is screwed onto the pad 3. Therefore, the pad 3 and the support rod 34 are integrally connected, and a spring 37 surrounding the support rod 34 is interposed between the pad 3 and the stepped portion 33.
The pad 3 is urged downward by the spring force of the spring 37, and the stopper portion 35 is prevented from falling off from the through hole 32 by the stopper portion 35 coming into contact with the punch holder 27.

A holding groove 38 having a substantially U-shaped cross section and corresponding to the upper half of the pipe P is bored in the lower surface of the pad 3.
This holding groove 38 fits into the upper half of the pipe P on the support portion 13.

Curved portion 1 in positioning groove 2 of bend die 1
A mounting groove 3 is provided on the lower surface of the punch holder 27 between both sides, corresponding to the pipe portion protruding from the pipe portion 4.
9 is drilled. On both sides of this mounting groove 39,
Projections 40 and 41 having sloped surfaces that approach each other as they move downward are protruded between both sides of the punch holder 27, and the bend punch 4 has projections 40 and 41.
Recesses 42 and 43 are bored into which the two can be slid together.

The bend punch 4 is slid into the mounting groove 39 by fitting the protrusions 40 and 41 into the recesses 42 and 43, respectively. Moreover, a fixing screw member 44 is screwed into one end of the punch holder 27, and this screw member 44 is inserted into a screw hole provided in the bend punch 4.
5, the bend punch 4 is fixed to the punch holder 27. Therefore, by loosening the screw member 44, the bend punch 4 can be slid along the mounting groove 39, and the operation of attaching and detaching the bend punch 4 is extremely easy.

The lower part of the bend punch 4, that is, the pressing part 46 projects downward from the punch holder 4, and is formed in a downwardly convex semicircular shape within a vertical plane that includes the axis of the pipe P. Moreover, on the lower surface of the pressing part 46,
A pressing groove 4 having a substantially U-shaped cross section into which the pipe P can be inserted
7 is drilled.

Next, the operation of this embodiment will be described. With the lifting platform 15 raised, the pipe P to be bent is placed on the positioning groove 2 of the bend die 1 by a transver (not shown). Next, the lifting table 15 is lowered, but this first causes the holding groove 38 of the pad 3 to press against the pipe 9 on the support part 13.
As the lifting platform 15 descends, the spring 37 is activated, and the pad 3 firmly presses the pipe P onto the bending die 1. As a result, the pipe P is firmly supported by the bend die 1 and the pad 3.
Further, as the platform 15 descends, the pressing groove 47 of the bend punch 4 fits into the portion of the pipe P that protrudes from the curved section 14, and as the platform 15 further descends, the pipe P is pressed against the curved section 14. , the pipe P is bent along the curved portion 14.

In such a pipe bending device, when the bending shape, that is, the bending position, bending angle, depth, etc. changes, the threaded rod 23 is rotated.
What is necessary is to move the punch holder 27, that is, the bend punch 4 to a desired position, and further move the bend die 1 on the base 5. This makes it possible to quickly deal with changes in the bending shape. Moreover, the type of pipe P can be quickly dealt with by moving the bend punch 4 and the bend die 1.

If there is a change in the type or bending shape of the pipe P that cannot be handled by moving the bend punch 4 and bend die 1, the bend die 1 and bend punch 4 can be replaced, making the replacement work extremely easy. And it can be done quickly. Furthermore, there are few opportunities to replace the bend die 1 and bend punch 4, and therefore the number of bend dies 1 and bend punches 4 to be prepared for replacement can be reduced.

As described above, according to the present invention, the bend punch is removably attached to the punch holder which is movable along the longitudinal direction of the pipe and supported on the lifting platform, so that Changes in the bending shape can be quickly dealt with by moving the punch holder, and the number of bend dies and bend punches that must be prepared can be reduced.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1... Bend die, 2... Positioning groove, 3... Pad, 4... Bend punch, 13... Support part, 14... Curved part, 15... Lifting platform, 27... Punch holder, P...
pipe.

Claims (1)

[Claims] 1. A positioning groove in which a linear support part for placing a pipe to be bent and a curved part curved in accordance with the shape to be bent are connected in a vertical plane. a bend die provided on the upper surface; a pad for pressing and supporting the pipe on the support portion toward the bend die; a bend punch that is driven up and down to abut and press a protruding portion from the curved portion of the pipe; In the pipe bending equipment including,
The pipe bending apparatus is characterized in that the bend punch is removably attached to a punch holder that is movable along the longitudinal direction of the pipe and supported on a lifting platform. 2. The pipe bending apparatus according to claim 1, wherein the bending die is movably and detachably fixed on a base in the longitudinal direction of the pipe.