JP2741229B2 - Bending equipment for small diameter metal pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a method for bending a small-diameter metal tube at a large number of places,
In particular, the present invention relates to a bending apparatus for a small-diameter metal pipe that is suitable not only when the bending direction of each bent portion is different from the same plane but also three-dimensionally, such as a fuel pipe and a brake pipe of an automobile. It is.

(Prior Art) Conventionally, as this kind of bending apparatus, there is a rod or a bar like a thin metal pipe bending apparatus described in the specification of Japanese Patent Application No. 63-18746 filed by the applicant. The pipe material is connected to be formed into a shape substantially matching the bent shape over the entire length of the metal pipe, and at the bent portion, the longitudinal direction has a curvature smaller than the bending radius of the metal pipe, and the width direction is bent. A fixed formwork having a guide surface or the like consisting of a surface substantially perpendicular to a plane;
A bending member having an outer peripheral surface facing the guide surface so that the metal tube can be bent along the guide surface, and moving from the outside of the fixed mold toward the fixed mold by an actuator attached to the mold. The fixed position of one end or the middle part of the straight metal tube is fixed with a clamp device or the like (see FIG. 2), the former is the free end from the fixed end or the middle fixing part, and the latter is the both free ends. Bending is performed by pressing the bending member along the form while moving the bending member forward or circularly toward the form in order toward the end.

(Problems to be Solved by the Invention) However, in the conventional bending apparatus for a metal pipe with a small diameter, when the metal pipe is bent by a bending member, the pipe end portion and the like are not covered by other parts of the apparatus or the floor. However, there is a problem that bending may not be performed due to interference with the like.

Therefore, an object of the present invention is to provide a bending apparatus that can sequentially perform bending while avoiding interference with a pipe end portion and other parts of the apparatus and a floor when bending a metal pipe with a bending member. Is to offer.

(Means for Solving the Problems) In order to achieve the above object, a bending apparatus according to the present invention connects a rod or a pipe to form a metal pipe having a shape substantially matching the bending shape over the entire length of the metal pipe. A fixed formwork; a first guide surface provided on the fixed formwork and having a curvature smaller than a bending radius of the metal tube in a longitudinal direction and a surface substantially perpendicular to a bending plane in a width direction. (1) a bent portion, a second guide surface provided on the fixed formwork and substantially parallel to a bending plane, and a second guide surface standing on the fixed formwork in a direction substantially perpendicular to the guide surface; At least one bending portion of a second bending portion including a guide member having a curvature smaller than a bending radius; and in the first bending portion, along the first guide surface.
In the second bending portion, the fixed formwork is provided from outside of the fixed formwork by an actuator attached to the formwork via a bracket such that the metal tube is bent along the second guide surface and the guide member, respectively. When the metal tube is bent by the bending member, if the metal tube interferes with other parts of the device, the floor, or the like, the bent portion A of the formwork in that portion is previously formed. The remaining formwork is divided, and the other formwork having the next bent portion B is pivotally connected to one formwork with the vicinity of the bent portion A as an axis. The other formwork is displaced from the normal position by the actuator so that the position and the respective bending start positions of the bending portions A and B are substantially on the same straight line, and is firstly moved by the next bending portion B on the straight line. After performing the bending process, the metal pipes of both bending parts were held down In state, in which the mold for the next bending portion B side so as to bending at the bending portion A returns to the normal position by the actuator.

(Operation) The present invention provides a fixed formwork having a guide surface as described above, and a metal tube attached to the formwork via a bracket so that the metal tube can be bent along the guide surface or the guide surface and the guide member. Actuator, such as an air cylinder,
Bending is performed by a bending member that moves from the outside of the guide by a rotary actuator or the like, as in the case of the previous application. When it interferes with other parts, floors, etc., the bending of that part is performed first, and then the bending is performed first, and then the bending is performed. The machining operation can be performed without interference without interfering with other parts, the floor, and the like.

(Embodiment) FIG. 1 (a) is a partial perspective view showing one embodiment of the processing apparatus of the present invention, FIG. 1 (b) is a partial perspective view of the same after processing, and FIG. It is a perspective view.

As shown in FIG. 2, reference numeral 1 denotes a surface which substantially conforms to the bent shape of the metal tube 2 over its entire length, and whose width direction is substantially perpendicular to the bending plane, preferably within a bending angle range near the bent portion. Bars, pipes, etc. having a first guide surface 1 'and a second guide surface 1 "substantially parallel to the bending plane are connected by welding 9 to form a continuous, generally long, three-dimensional shape. The fixed formwork has a flat portion in the cross-sectional contour, and is preferably formed in a substantially quadrangular cross-section, but the cross-sectional shape of the second guide surface 1 "is not limited to this, and may be circular. In this case, the second guide surface 1 "means a surface formed by a tangent to an outer peripheral surface of the metal tube 2 extending in a direction substantially perpendicular to a guide member 3 described later. The first guide surface 1 '
And a guide member 3 erected by welding or the like in a direction substantially perpendicular to the second guide surface 1 ″.
The curvature and shape of the guide surface 1 ′, the second guide surface 1 ″, the guide member 3 and the mold 1 have a curvature smaller than the bending radius of the metal tube 2 in consideration of the springback of the metal tube 2 during bending. The guide member 3 may be formed in a plate-like shape or a block-like shape, and the mold 1 is formed by a necessary number of columns 4 with a base (not shown). While being fixed to the upper, base relative to binding posts 4 comrades each other does not necessarily require .5,5 ₁ and 5 ₂ are metal tubes 2 of the first guide surface 1 ', or the second guide surface 1 "Guide A bending member arranged to be able to move toward the fixed formwork 1 while being pressed against the member 3, and a bending member for bending on the first guide surface 1 ′ has an outer peripheral surface corresponding to the first guide surface. It is disposed so as to face the second guide surface 1 ″ and the guide member 3. Bending element for bending the direction of movement is arranged with substantially parallel to slight tilting the second guide surface 1 ". In the bending member 5 ₁ indicated by the two-dot chain line Figure 1 shows the bending element indicating the position before working. Moreover, the bending member 5 ₂ attached to the lever 6, the rotational center of the lever 6 is extended pivotally secured to the mold 1 of the bent portion vicinity metal pipe 2 to the outside. The other end an actuator 7 (the figure shows the air cylinder ₇₁₎ is supported by a tip end of a piston rod 7a which constitutes the to brackets 8, 8 ₁ attached to one end likewise mold 1 of the air cylinder 7 ₁ It is configured so as to be pivoted and follow the rod direction due to the expansion and contraction of the piston rod 7a. Furthermore, the bending members 5, 5 _1, 5 ₂ actuator 7 for driving the other of the air cylinder ₇₁ shown, may be operated by a rotary actuator.

In the bending of the metal tube 2, as in the conventional case, first, the metal tube 2 is hooked and fixed to a hook provided at one end of the mold frame 1 using an end fitting (see FIG. 2). Alternatively, a fixed position of the intermediate portion of the metal tube 2 having been dimensioned by a stopper or the like is fixed to the intermediate portion of the mold 1 by a clamp device or the like.
Next, in the former, the metal pipe 2 is moved toward the free end side from the fixed end side, and in the latter, from the fixed portion toward both free ends, the metal tube 2 is moved in the circular direction toward the mold 1 while the bending member 5 is moved toward the mold 1. Guide member 1 'or second guide surface 1 "and guide member 3
And the bending process is performed.

At this time, in the course of bending the metal pipe 2 by the bending member 5, the pipe end side portion of the metal pipe 2 may interfere with other parts such as a formwork, a bending member, the floor, or the like. Therefore, in the present invention, in order to prevent the interference, the fixed form 1 of the bent portion at the position where the pipe end portion of the metal tube interferes when bending is performed.
Preferably, the vicinity of the bending stop portion is divided so that the interference side formwork is rotatable. That is, FIG. 1 (b)
As shown in (1), the fixed mold 1 is divided into molds 1a and 1b while leaving a bent portion M (a portion bent downward in the figure) of the fixed mold 1. An arm 9 having one end pivotally mounted is provided on a point C near the bent portion M, and is connected to the other divided mold 1b. The entire mold 1b is turned around the point C as an axis. The air cylinder 11 attached to the mold 1a is displaceable so that the metal cylinder 2 before bending is placed on both the molds 1a and 1b. That is, the cylinder 11 pivotally attached to the bracket 10
The lever 12 is pivotally attached to the tip of the piston rod 11a, and the end of the lever 12 is welded to the tip of the mold 1b. When the cylinder 11 is operated from the state shown in FIG. 1 (b) to extend the piston rod 11a, the end of the divided form 1b is twisted up by the cooperation of the lever 12, and the end of the form 1b is formed. It should be on the extension of the frame 1a (see FIG. 1 (a)).

Therefore, in this state, the bending end position of the former process of the mold 1a and the respective bending start positions of the bent portion (A) and the next bent portion (B) of the mold 1b are substantially on the same straight line. I'm getting on.

In this state, the bending portion of the mold 1b is next bent portion (the position of the guide member 3) by operating the air cylinder ₇₁ and the metal pipe 2 at a bending member 5 ₂ via the L lever 6 Bend first. The bending together hold the metal tube 2 by the bending member 5 ₂ at the end point, the bending pressing even on mold 1a the metal tube 2 by the processing section for bending one previous bending than M members 5 _1, in this state until動作 If the air cylinder 11 is operated (the piston rod 11a is contracted), the metal tube 2 is fixed before and after the bent portion even if the bent portion M has no bent member. (B) shape along the guide surface 1 'of the bent portion M). After the metal pipe 2 is completely bent and the bent metal pipe 2 is removed from the form, the form 1b is bent by the previous bending for the next metal pipe. If there is no interference, it may be displaced to the state shown in FIG. Reference numeral 13 denotes a holding plate for preventing the metal tube 2 from coming off from the mold frame by receiving the reaction force of bending when the metal tube 2 is bent by the mold frame 1b and maintaining the bending accuracy. Further, the present invention can be used not only for metal pipes but also for bending rods.

As described above, even if there are other parts or floors of the apparatus that interfere with the movement path of the bending of the metal pipe 2, at least one bending process must be performed in advance before the bending. Since the processing is performed, the bending processing of the metal pipe 2 can be continuously performed without any trouble.

In the illustrated embodiment, the case where the bending plane of the one bent part and the bending plane of the previous bent part intersect is described.
It is applicable even in the same bending plane.

(Effects of the Invention) As described above in detail, according to the present invention, the fixed formwork and the metal tube are directly or directly supported on the formwork or the bracket so that the guide form and the metal tube can be bent along the guide surface or the second guide surface. The bending process is performed by a bending member which is moved from the outside of the guide by an actuator attached via the shaft. That is, since the actuator for operating the bending member is connected to the fixed formwork, the bending due to the stay or the like is prevented. That is, the influence of the backlash of the piston rod bush in the extended state can be minimized, and the bending moment can be hardly applied. Therefore, it is possible to prevent the occurrence of subtle irregularities (breathing) occurring between the bending member and the guide, and to obtain a highly accurate bent product.

Furthermore, when the metal pipe is bent by the bending member, the end of the metal pipe may interfere with other parts of the apparatus or the floor. The initial bending process is performed by returning the displaced formwork after the displacing and finishing the first bending process, so that the bending process is continued without any trouble. In addition, after cutting a commercially available square bar or the like to the required length and bending it, it is continuously welded to almost match the bending shape over the entire length of the metal pipe except for a part, and furthermore, it is shaped like a plate. A guide is erected at a predetermined position to form a formwork,
Since a bending member (including an actuator) is arranged so as to operate toward the formwork, and a part of the formwork is rotatable, the entire bending apparatus can be configured. Can be greatly reduced, miniaturization and weight reduction can be achieved, manufacturing costs can be significantly reduced, and since it can be manufactured in an extremely short time, it can be reliably operated at the start of mass production. It has a great effect.

[Brief description of the drawings]

FIG. 1 (a) is a partial perspective view showing an embodiment of the processing apparatus of the present invention, FIG. 1 (b) is a partial perspective view after processing, and FIG.
The figure is a schematic perspective view of the fixed formwork. 1 ... fixed frame, 1 ', 1 "... guide surface, 2 ... metal pipe, 3 ... guide member, 4 ... post, 5,5 _1, 5 ₂ ... bending member, 6 ... lever , 7 ... Actuator, 7 ₁ , 11 ...
… Air cylinder, 8, 8 ₁ , 10… bracket, 9… arm, 12… lever, 13… holding plate

Claims (1)

(57) [Claims] 1. A fixed form formed by connecting rods or pipes to a shape substantially conforming to a bent shape over the entire length of a metal pipe; and a fixed form provided on the fixed form and having a longitudinal direction of metal. A first guide surface having a curvature smaller than the bending radius of the pipe and having a first guide surface formed in a width direction substantially perpendicular to a bending plane;
A bent portion, a second guide surface provided on the fixed formwork and substantially parallel to a bending plane, and a metal tube that is erected on the fixed formwork in a direction substantially perpendicular to the second guide surface. At least one bending portion having a guide member having a curvature smaller than the bending radius of the second bending portion; and in the first bending portion, along the first guide surface and the second bending portion. In the 2 bending section, the second
A bending member that moves toward the fixed form from outside the fixed form by an actuator attached to the form via a bracket such that the metal tube is bent along the guide surface and the guide member, respectively. If the metal pipe interferes with other parts of the apparatus or the floor when the metal pipe is bent by the member, the mold is divided in advance, leaving the bent part A of the form in that part, and the next bent part is formed. B is pivotally connected to one of the molds around the bent portion A as an axis, and the bending end position of the former process of one of the molds and the bending of the bent portions A and B respectively. The other formwork is displaced from the normal position by the actuator so that the initial position is substantially on the same straight line, and after the first bend is performed at the next bent portion B on the straight line, the metal pipes at both bent portions are formed. While holding down, the next formwork part B side formwork Serial actuator by the bending apparatus of a small diameter metal tube, characterized in that bending in the bent portion A returns to the normal position.