JP2012250278A - Bending device - Google Patents

Abstract

A bending apparatus with improved workability and convenience capable of forming a rod-like workpiece such as a pipe into an arbitrary bending radius within an arbitrary bending range and shortening the working time.
A first mold 12 provided on a fixing member 11 and having two engaging portions spaced from each other with respect to a rod-shaped workpiece 20 is opposed to the first die with the workpiece interposed therebetween. A second die 13 that presses the workpiece at the center of the two engaging portions, and is interposed between the fixing member and the second die, and the second die and the Bending radius adjusting means 14 for determining a bending radius by changing a relative distance from the first mold, and a rotating means 30 for rotating the forming part and the workpiece relative to each other. It is equipped with.
[Selection] Figure 1

Description

  The present invention relates to a bending apparatus used when bending a rod-shaped body such as a pipe or rod having a circular or rectangular cross section into an arc shape.

As a conventional bending apparatus, there is one in which a bending radius is determined according to a mold to be used (see, for example, Patent Document 1).
In addition, there is a structure in which a rotary drive mechanism is provided in a pressing die and a receiving die roll so that the workpiece is bent while being fed by the pressing die and the receiving die (for example, see Patent Document 2).
Also, a general-purpose three-point bending apparatus provided with an attachment portion for attaching an auxiliary member that holds the pipe against the bending regulating member while preventing the bending of the pipe when the pipe is bent to keep the pipe bent. (See, for example, Patent Document 3).

Japanese Patent No. 2960046 (pages 3 to 4, FIG. 1) JP 2010-260105 A (first page, FIG. 1) Japanese Patent No. 3577782 (pages 4-6, FIG. 1)

  In the molding by a general-purpose pipe bender as in Patent Document 1, the bending radius is fixed, and when the bending radius is changed, another mold is required each time, and there is a problem that the convenience is poor. In addition, the bending apparatus as disclosed in Patent Document 2 has a problem that the apparatus is very large and difficult to carry because the push-type and receiving-type rolls are provided with a rotation drive mechanism. In addition, the bending radius of the molding by the three-point bending apparatus as in Patent Document 3 is arbitrary. However, since the range that can be molded at one time is small, it is necessary to repeat the molding by shifting the workpiece when bending a certain range. There was a problem that it took a long time.

  The present invention has been made to solve the above-described problems of the prior art, and can be formed into an arbitrary bending radius of an arbitrary bending range of a rod-like workpiece such as a pipe, and can be reduced in size and weight. It is an object of the present invention to provide a bending apparatus that can improve workability and convenience and can reduce work time.

  A bending apparatus according to the present invention includes a first die having two engaging portions that are provided on a fixing member and are spaced apart from each other with respect to a rod-like workpiece, and the workpiece is sandwiched between the first die. A second mold that is disposed so as to be opposed and presses the workpiece at the center of the two engaging sections; and the second mold and the second mold that are interposed between the fixing member and the second mold. A bending radius adjusting means for determining a bending radius by changing a relative distance from the first mold, and a rotating means for relatively rotating the forming part and the workpiece. It is a thing.

  In the present invention, the bending radius of the workpiece is determined by changing the relative distance between the first die and the second die by the bending radius adjusting means in the molding portion, and the workpiece is moved relative to the molding portion by the rotating means. Therefore, it can be bent to an arbitrary bending radius with a single set of molds. In addition, the size and weight can be reduced, the workability and convenience are improved, and the work time can be shortened.

It is a top view which shows notionally the principal part of the bending apparatus which concerns on Embodiment 1 of this invention. It is a top view which shows notionally the principal part of the bending apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a top view conceptually showing a main part of the bending apparatus according to Embodiment 1 of the present invention. In the figure, the bending apparatus is a receiving mold which is a first mold having a substantially triangular plate-shaped fixing member 11 and two engaging portions 121 and 122 spaced from each other with respect to a rod-shaped workpiece 20 such as a pipe. 12, a pressing die 13 that is a second die that is disposed so as to face the receiving die 12 and engages the workpiece 20 so as to be pressed at the center of the two engaging portions 121 and 122; And the forming part 10 comprised by the bending radius adjustment means 14 using the hydraulic cylinder which determines a bending radius by adjusting the distance of the pressing die 13 and the receiving die 12, and the workpiece fixing for rotating this forming part 10 The rotating unit 30 includes a member 31, a hydraulic cylinder 32 for rotation driving, and a turntable 33.

  The two engaging portions 121 and 122 constituting the receiving mold 12 are rotatably provided via a shaft erected with respect to the fixing member 11, and the abutting portion with respect to the workpiece 20 is the workpiece. The roll 20 is formed by an outer peripheral surface made up of, for example, an arcuate concave surface corresponding to the cross-sectional shape of the material 20, and is disposed inside the two corners of the substantially triangular fixing member 11. The pressing die 13 as the second die is configured to use a roll die that is provided so as to be rotatable with respect to the support member 131 and in which a contact portion with respect to the workpiece 20 is formed by a similar outer peripheral surface made of a concave surface. ing. Note that the receiving mold 12 and the pressing mold 13 each have a roll-free rotation structure as described above in order to reduce the frictional force with the workpiece 20 that is a workpiece.

  In the bending radius adjusting means 14, a cylindrical body portion 14 a is fixed to the fixing member 11, and a support member 131 holding the pressing die 13 rotatably is fixed to the tip of the piston 14 b of the bending radius adjusting means 14. Has been. The center of the pressing die 13 and the centers of the engaging portions 121 and 122 are installed so as to form an isosceles triangle. The turntable 33 is formed in a disk shape and is rotatably supported with respect to the fixed member 11. A large number of holes 33a are provided in the upper surface of the turntable 33 at equal pitches in the circumferential direction. In the rotational drive hydraulic cylinder 32, the body portion 32 a is rotatably locked in one of the holes 33 a of the turntable 33, and the tip end portion of the piston 32 b is rotatably locked to the fixing member 11. . The rotational drive hydraulic cylinder 32 is configured to be easily attached to and detached from the turntable 33 and the fixed member 11.

  The work fixing member 31 has one end (the right end in the figure) fixed to the turntable 33 using one of the holes 33a of the turntable 33, and the other end is configured to hold the workpiece 20 as a work. It is configured. In addition, the fixed position with respect to the turntable 33 can be easily changed to an arbitrary position, and the fixed position is changed according to the bending radius of the workpiece 20 or different lengths are prepared. In addition to the above, a hydraulic pump, a hydraulic hose, etc. are not shown. For example, existing ones can be used as appropriate. The bending apparatus is configured to be portable, for example, portable or easily movable.

  Hereinafter, the operation of the first embodiment configured as described above will be described. First, the bending radius adjusting means 14 is retracted to the retracted position to secure a sufficient space between the pressing die 13 and the receiving die 12. Next, for example, a portion to be bent of a straight workpiece 20 such as a copper pipe is inserted between the receiving die 12 and the pressing die 13. At this time, a grip margin by the workpiece fixing member 31 is necessary near the bend forming start portion of the workpiece 20. Next, the bending radius adjusting means 14 is operated to bring the pressing die 13 into contact with the workpiece 20, and after confirming the bending position, for example, if necessary, the bending radius adjusting means 14 is further received in the direction of the mold 12. By advancing the amount and setting a predetermined bending radius, the bending radius with respect to the workpiece 20 is determined, and the spaced apart receiving molds 12 of the workpiece 20 are bent into an arc shape.

  Next, after the workpiece 20 is locked so that the vicinity of the bent end of the workpiece 20 is gripped by the workpiece fixing member 31, the workpiece fixing member 31 is positioned most closely to the engaging portion 121 in the hole 33 a of the turntable 33. It fixes to the fixing member 11 using a near hole. Then, the rotation drive hydraulic cylinder 32 is engaged with the hole 33 a of the turntable 33 and the fixing member 11. The rotational drive hydraulic cylinder 32 can also be attached to the right side of FIG. When the rotational drive hydraulic cylinder 32 is attached to the right side, the piston 32b is operated in a retracting direction.

  Regardless of whether it is mounted on either the left or right side, the work table 20 is rotated at a set radius according to the stroke of the piston 32b by rotating the turntable 33 relative to the fixed member 11 counterclockwise. It can be bent at an angle. Thereafter, the forming unit 10 is relatively rotated by sequentially changing the rotation driving hydraulic cylinder 32 until the bending angle of the workpiece 20 reaches a desired value such as 90 degrees or 180 degrees, for example. The material 20 is bent to a desired bending angle.

  In addition, as for the row | line | column of many holes 33a provided in the turntable 33 at equal pitch, you may provide two or more things from which a radius differs concentrically. In this case, the radii can be finely changed by staggering the holes in the rows adjacent in the radial direction. Further, in order to easily distinguish the row of holes having different diameters, the center of the holes may be clearly shown in the circumferential direction, for example, by a line colored in a different color. Note that the length of the fixing member 11 needs to be changed according to the bending radius. Furthermore, when the bending radius is largely changed, a mechanism for changing the center position of the turntable 33 relative to the fixed member 11 may be provided in order to change the center position of the turntable 33 with respect to the fixed member 11. Further, any of the turntable 33 and the fixing member 11 may be rotated.

  As described above, according to the first embodiment, the work piece 20 is sandwiched between the receiving die 12 as the first die and the pressing die 13 as the second die, and the bending radius adjusting means comprising the hydraulic cylinder. 14, the bending radius of the rod-shaped workpiece 20 is determined by adjusting the relative distance between the first die and the second die, and the workpiece 20 is moved to the first by the rotary drive hydraulic cylinder 32 as a rotating means. Since the second mold is rotated relative to the bending direction, the adjustment of the push-in amount by the hydraulic pressure of the bending radius adjusting means 14 and the rotation of the molding portion 10 can be arbitrarily adjusted. The workpiece 20 can be bent within a certain range with a required bending radius.

  In addition, since the pressing die 13 and the receiving die 12 have a roll-free rotation structure, the frictional force with the workpiece 20 generated when the molding unit 10 rotates is reduced, the processing is easy, and the apparatus can be downsized. In addition, since it is a combination of static equipment that does not use a motor, it can be a safe and reliable device, and it can be configured to be lightweight and portable, improving workability and convenience and reducing work time. It can be shortened.

Embodiment 2. FIG.
FIG. 2 is a top view conceptually showing the main part of the bending apparatus according to Embodiment 2 of the present invention. In the second embodiment, a screw mechanism that is advanced and retracted by a screw screw is used as the bending radius adjusting means 14A, and a rotating screw mechanism that is advanced and retracted by a screw screw is used as a driving means constituting the rotating means 30A. It is intended to be used. Hereinafter, a different part from Embodiment 1 is demonstrated. In FIG. 2, the bending radius adjusting means 14 </ b> A has a fixing piece 141 that is erected and fixed to the fixing member 11, and a screw hole 141 a is screwed in the center, and a tip part (upper part in the drawing) that is screwed into the screw hole 141 a. The bending radius adjusting bolt 142 is engaged with the support member 131 of the pressing die 13.

  Further, a scale 143 for measuring the pushing amount of the pressing die 13 is provided on the side surface portion of the fixed piece 141. The bending radius adjusting means 14A causes the shaft portion 142b to move forward and backward by rotating the head portion 142a of the bending radius adjusting bolt 142 with an appropriate tool such as a wrench or a rechargeable electric tool, thereby moving the push die 13 forward and backward. Can do. The pressing die 13 is pivotally attached to the tip end portion of the shaft portion 142b, and is advanced and retracted in the axial direction in conjunction with the advancement and retreat of the shaft portion 142b. The amount of pushing is measured and managed by quantitatively grasping the position of the support member 131 with the scale 143.

  The rotating means 30A composed of a screw mechanism is provided with a rotating bolt 34 and a through hole through which the rotating bolt 34 is inserted in a freely fitting manner so as to be rotatable and detachably attached to an arbitrary hole 33a of the rotating table 33. A screw hole (which is rotatably and detachably attached to the first rotation piece 35 provided and the locking hole 11a provided in the fixing member 11 and is screwed into the shaft portion 34b of the rotation bolt 34 ( The second turning piece 36 is provided with a not-shown illustration. The turntable 33 can be rotated counterclockwise by turning the head 34a of the rotation bolt 34 clockwise with an appropriate tool such as a wrench or electric tool.

  In the second embodiment configured as described above, the same operational effects as in the first embodiment can be obtained, and since a hydraulic cylinder is not used as compared with the first embodiment, a hydraulic pump or a hydraulic hose is used. There is no need, and the device can be further reduced in weight. For this reason, portability can be made more advantageous. It can be easily used even in a work place where the workpiece 20 such as a pipe is bent.

  The first embodiment is used, for example, when a highly rigid thick pipe or a bending radius is small, and the second embodiment is used, for example, when a thin pipe or a bending radius is large. You may make it use both appropriately according to the material, kind, and the specification of a bending process. In this case, other members can be made common by changing the hydraulic cylinder of the drive source and the screw mechanism. Moreover, although the case where the workpiece 20 was a pipe was demonstrated, it cannot be overemphasized that it can process similarly even if it is a wire, a bar, etc.

  DESCRIPTION OF SYMBOLS 10 Molding part, 11 Fixing member, 11a Locking hole, 12 Receiving die, 121, 122 Engagement part, 13 Push mold, 131 Support member, 14 Bending radius adjusting means (hydraulic cylinder), 14a Body part, 14b Piston, 14A Bending radius adjusting means (screw mechanism), 141 fixing piece, 141a screw hole, 142 bending radius adjusting bolt, 142a head, 142b shaft, 143 scale, 20 workpiece, 30 rotating means, 31 work fixing member, 32 Rotating drive hydraulic cylinder, 32a body part, 32b piston, 33 rotating table, 33a hole, 30A rotating means (screw mechanism), 34 rotating bolt, 34a head, 34b shaft, 35 first rotating piece, 36 Second rotating piece.

Claims (8)

  A first die having two engaging portions provided on the fixing member and spaced apart from each other with respect to the rod-like workpiece, and disposed so as to face the first die with the workpiece interposed therebetween. A second die that presses the workpiece at the center of the two engaging portions; and a relative distance between the second die and the first die that is interposed between the fixing member and the second die. A bending apparatus comprising: a forming portion having a bending radius adjusting means for determining a bending radius by changing the shape, and a rotating means for relatively rotating the forming portion and the workpiece.   The first mold is a roll mold that is rotatably provided through a shaft that is erected with respect to the fixing member, and in which the engaging portion is formed by an outer peripheral surface that is a concave surface. The bending apparatus according to claim 1.   The said 2nd type | mold uses the roll type | mold which was provided rotatably with respect to the support member, and the said engaging part was formed with the outer peripheral surface which consists of a concave surface. Item 3. The bending apparatus according to Item 2.   4. A bending apparatus according to claim 1, wherein the bending radius adjusting means comprises a cylinder driven by fluid pressure.   4. The bending apparatus according to claim 1, wherein the bending radius adjusting means includes a screw mechanism that is advanced and retracted by a screw screw.   The rotation means is a disc-shaped turntable having a rotation center on a line orthogonal to a central portion of a straight line connecting the two engaging portions of the first mold provided rotatably with respect to the fixing member; 6. The bending according to any one of claims 1 to 5, comprising driving means interposed between the turntable and the fixing member to relatively rotate the turntable and the fixing member. apparatus.   7. A bending apparatus according to claim 6, wherein the driving means comprises a cylinder driven by fluid pressure.   7. The bending apparatus according to claim 6, wherein the driving means comprises a screw mechanism that is advanced and retracted by a screw screw.

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