JP2017070968A - Folding-processing method of long-size material and folding-processed article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding-processing method and a folding-processed article capable of suppressing outer R of a folded part small when folding a square pipe according to a manual operation by forming a notch part of V-shape on the square pipe.SOLUTION: A folding-processing method of a long-size material provided with two surfaces orthogonally crossed to each other includes respective processes of: a process of setting one lateral surface 3A of the long-size material 3 as a surface to be bending-processed and forming a notch part 7 of V-shape having one lateral surface 3A as a bottom part on the other lateral surface 3B orthogonally crossed; a process of performing the folding processing of a part 5 to be folded by means of molds of a male form and a female form in order to make an outside diameter of the part 5 to be folded almost constant over the whole length of a fold line when setting the bottom part of the notch part 7 as the part 5 to be folded and folding one lateral surface 3A of the long-size material 3 into the V-shape; and a process of again performing folding-operation of the long-size material 3 according to a manual operation so as to join surfaces to be joined 9A, 9B on the notch part 7 of the V-shape of the other side surface 3B after folding-processing by means of the molds.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bending method and a bending product of a long material having two surfaces orthogonal to each other, such as a square pipe and an angle material, and more specifically, one side surface of the long material. When forming the V-shaped notch with the one side face at the bottom on the other orthogonal side face, and bending the one side face by hand, the outside R of the bent part is kept small. The present invention relates to a bending method and a bent product.

  2. Description of the Related Art Conventionally, V-shaped cutouts are formed at a plurality of locations on a square pipe as an example of a long material having two orthogonal surfaces, and the cutouts are bent manually, for example, a rectangular frame. Etc. (see, for example, Patent Documents 1 and 2).

JP-A-9-253756 Japanese Patent No. 4457398

  In FIGS. 4, 5 and 6 of Patent Document 1, V-shaped notches are formed at a plurality of locations of a rectangular pipe as a long material, leaving one side surface to be bent. Then, with the bottom of the notch being the position of the fold line, bending is performed manually, and after joining the separated joint surfaces of the notch, welding is performed to form a rectangular frame. Yes. As described above, when a bending process is performed by forming a V-shaped notch in a square pipe, when the male mold is placed in the notch and the bending process is performed, the male surface is formed by the joint surface of the notch. Since the mold may be firmly sandwiched, it is generally bent manually.

  As described above, when the V-shaped notch portion of the square pipe is bent manually, the outer R at the bent portion becomes large, and it is difficult to bend the desired small R.

  In Patent Document 2, as shown in FIGS. 19 and 22 of Patent Document 2, an R-shaped convex portion is formed on the outer surface of the bottom portion of the V-shaped notch formed in the square pipe. (Bulge) is formed. After that, as shown in FIGS. 20 and 23, a configuration is described in which bending is performed and the joint surfaces of the notches are combined.

  According to the configuration described in Patent Document 2, since the convex portion is formed in advance at the bottom portion of the notch portion, it is possible to suppress an increase in the outer radius R of the bent portion. However, a special mold for forming the convex portion is required. Further, after the bending of the square pipe, the convex portion tends to remain as a protrusion on the outside of the bent portion.

The present invention was made in view of the problems as described above, and is a method for bending a long material having two orthogonal surfaces,
(A) a step of forming a V-shaped notch with the one side surface as a bottom on another side surface orthogonal to one side surface of the long material as a bending surface;
(B) When bending one side of the long material into a V shape with the bottom of the notch as a bent part, in order to make the outer diameter of the bent part substantially constant over the entire length of the fold line, A step of bending the bent portion with a male mold and a female mold;
(C) a step of bending the long material manually to join the joint surface in the V-shaped cutout portion on the other side surface after the bending by the mold;
Each process is provided.

  In the bending method for the long material, the bending process of the bent portion by the mold is a bottoming process.

  Also, a bent product obtained by bending one side of a long material having two orthogonal surfaces as a bent surface and bending the bottom of a V-shaped notch formed on the other orthogonal surface as a bent portion. The outer R portion of the bent portion is characterized in that the outer R at each position along the bend line is equal.

  In the bent product, an engagement recess is provided on one joint surface of the notch, and an engagement protrusion engaged with the engagement recess is provided on the other joint surface of the notch. It is characterized by this.

  According to the present invention, when the V-shaped portion formed on the square pipe is bent manually, it is possible to prevent the outside R of the bent portion from increasing.

It is plane explanatory drawing which showed one example of the bending processed goods which concern on embodiment of this invention notionally and schematically. It is explanatory drawing which bends a square pipe by manual work. It is explanatory drawing which performs the process which bends a square pipe with a metal mold | die before bending manually. It is explanatory drawing which shows another form of a V-shaped notch part.

  Referring to FIG. 1, as an example of a long bent product 1 according to an embodiment of the present invention, a square pipe 3 is illustrated as a rectangular frame. The production of the bent product 1 is performed as follows. That is, a square pipe 3 having a length equal to the developed length of the bent product 1 is prepared. And as shown in FIG. 2, the both sides orthogonal to the said one side surface 3A so that the one side surface 3A of the square pipe 3 may become a bending surface in the part corresponded to the bending part 5 of the said bending processed product 1. The V-shaped cutout portion 7 is cut by laser processing over the three side surfaces of the orthogonal side surface 3B and the parallel side surface 3C parallel to the one side surface 3A. That is, the notch 7 is formed at three locations of the square pipe 3 leaving the bent portion 5 on the one side surface 3A to be bent. Then, both end portions of the square pipe 3 are cut by laser processing with the inclined surface of the cutout portion 7 made equal in inclination.

  As described above, the bent portion 5 of the square pipe 3 in which the V-shaped cutout portions 7 are formed at a plurality of locations can be easily bent by manual work. That is, as indicated by an arrow A in FIG. 2, the square pipe 3 can be bent at the bent portion 5 by rotating a part of the square pipe 3 around the bent portion 5. Then, as shown by an imaginary line in FIG. 2, after joining the joint surfaces 9A and 9B of the notch portion 7, for example, welding is performed in a state in which the joint surface 9A and the joint surface 9B are joined, as shown in FIG. The bent product 1 shown in FIG.

  By the way, as described above, when the bending portion 5 is bent manually, the outer R (outer diameter) on the outer surface of the bending portion 5 tends to increase. When the outer radius R of the bent portion 5 increases, the inner radius R (inner diameter) on the inner surface of the bent portion 5 tends to increase, and in some cases, the position where the joint surfaces 9A and 9B are joined to each other and the folding position. A slight gap may occur between the bent portion 5 and the bent portion 5. Therefore, when performing laser welding of the joint surfaces 9A and 9B, it is desirable that there is no gap.

  Therefore, in this embodiment, in order to suppress the outer radius R at the bent portion 5 to be smaller, the mold 11 (see FIG. 3) is placed before the bent portion 5 of the square pipe 3 is bent manually. Used to bend with a press brake. The mold 11 includes a female die (die) 13 having a V-groove 13V and a male die (punch) 15 that presses and presses the bent portion 5 of the square pipe 3 into the V-groove 13V. It is. Therefore, after the notch 7 of the square pipe 3 is positioned on the die 13, the bent portion 5 of the square pipe 3 is pressed and pressed by the punch 15 to bend the bent portion 5. It can be done.

  As described above, when the bending portion 5 of the square pipe 3 is bent by the punch 15 and the die 13, partial bending (air bending) is also possible. However, bending by bottoming is desirable to suppress the outer radius R at the bent portion 5 and to improve the bending accuracy. As described above, after the bending portion 5 is bent by the punch 15 and the die 13, the bonding surfaces 9A and 9B are bent again to be joined manually. Then, after temporarily joining the joining surfaces 9A and 9B to the joined state, the joining surfaces 9A and 9B are welded.

  By the way, as described above, when the bent portion 5 is bent by the mold 11, the punch 15 tends to be sandwiched between the joining surfaces 9A and 9B. Therefore, it is desirable that the angles of the V groove 13V and the tip of the punch 15 in the die 13 be a desired angle at which the joining surfaces 9A and 9B do not firmly sandwich the punch 15.

  As can be understood from the above description, according to the present embodiment, the V-shaped cutout portion 7 is formed in the square pipe 3 and the bent portion 5 at the bottom of the cutout portion 7 is bent manually. Further, the bending portion 5 is bent by the punch 15 and the die 13. Therefore, the bent portion 5 is bent in a state regulated by the punch 5 and the die 13. Therefore, the outside R of the bent portion 5 is smaller than the outside R in the case of bending manually from the beginning.

  That is, according to the present embodiment, after bending the bent portion 5 using the punch 15 and the die 13, the bent portion 5 is again bent manually, so that the joint surface in the notch portion 7 is obtained. Since 9A and 9B are joined, the bulge of the bending part 5 can be suppressed small and the external appearance as a product can be improved.

  The present invention is not limited to the above-described embodiment, and can be implemented in other forms by making appropriate changes. That is, in the said embodiment, it illustrated about the case of the square pipe as a long material. However, it can be applied to an angle material or a channel material instead of the square pipe.

  Further, when the V-shaped cutout 7 is formed by laser processing, as shown in FIG. 4, an engagement recess 17A having an appropriate shape is formed on one of the joining surfaces 9A and 9B, and the other of the joining surfaces 9A and 9B is formed. In addition, an engaging convex portion 17B that engages with the engaging concave portion 17A is formed. At this time, the bent portion 5 is bent to join the joining surfaces 9A and 9B, and when the engaging concave portion 17A and the engaging convex portion 17B are engaged, the spring back of the bent portion 5 is used. On the other hand, it is desirable that the engagement between the engagement concave portion 17A and the engagement convex portion 17B is maintained.

  That is, when the joining surfaces 9A and 9B are joined, the squeezing phenomenon occurs between the engaging recess 17A and the engaging projection 17B, rather than the dimension of the opening 19A of the engaging recess 17A. The size of the base portion 19B in the engaging convex portion 17B is slightly increased. By adopting such a configuration, the engagement between the engagement concave portion 17A and the engagement convex portion 17B can be made hard (tight) to such an extent that it cannot be released by the spring back of the bent portion 5. . Therefore, it becomes possible to omit the temporary welding operation after joining the joining surfaces 9A and 9B, and the working efficiency can be improved.

DESCRIPTION OF SYMBOLS 1 Bending product 3 Square pipe 5 Bending part 7 Notch 9A, 9B Joining surface 13 Die 15 Punch 17A Joining recessed part 17B Engaging convex part

Claims (4)

A method of bending a long material having two orthogonal surfaces,
(A) a step of forming a V-shaped notch with the one side surface as a bottom on another side surface orthogonal to one side surface of the long material as a bending surface;
(B) In order to make the outer diameter of the bent portion substantially constant over the entire length of the bending line when the bottom portion of the notch portion is a bent portion and one side surface of the long material is bent into a V shape. The step of bending the bent portion with a male mold and a female mold,
(C) a step of manually bending the long material again to join the joint surface at the V-shaped notch on the other side surface after the bending by the mold;
A method for bending a long material, comprising the steps of:   2. The method for bending a long material according to claim 1, wherein the bending of the bent portion by the mold is bottoming.   A bent product obtained by bending one side of a long material having two orthogonal surfaces as a bent surface and bending the bottom of a V-shaped cutout formed on the other orthogonal surface as a bent portion, A bent product, wherein the outer R portion of the bent portion has the same outer R at various points along the folding line. 4. The bent product according to claim 3, wherein an engagement concave portion is provided on one joint surface of the cutout portion, and an engagement convex portion engaged with the engagement concave portion is provided on the other joint surface of the cutout portion. Bending product characterized by having.

Images