JP2589543B2 - Bending equipment for small diameter metal pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a device for bending a small-diameter metal pipe at a large number of places, particularly, a bending direction of each bending portion such as a fuel pipe and a brake pipe of an automobile. The present invention relates to an apparatus for bending a small-diameter metal pipe, which is suitable for a case where they are not on the same plane but are different in three-dimensional directions.

(Prior Art) As a conventional bending apparatus of this kind, as shown in FIG. 8, a receiving roll 11 is first moved by a cylinder 12 to contact a metal pipe 13 for one bending processing, and then a bending is performed. A required number of unit bending devices for bending the metal tube 13 by moving the roll 14 by the cylinder 15 are arranged at a plurality of required bending positions. In addition, 16,17
Indicates a base, 18, 19 indicate stays, and 20 indicates a base.

(Problems to be solved by the invention) However, in the conventional bending apparatus, the receiving roll
11 and the bending roll 14 are moved by the cylinders 12 and 15, respectively, so that two operations are required for one bending operation.
Since bending is performed with both the piston rods 12 and 15 extended, if a pressurized fluid is supplied into a cylinder (generally an air cylinder) during bending, the bending moment applied to the piston rods increases. Cylinder 1
Since the distance between the rolls 2 and 15 is large, the stays 18 and 19 and the bases 16 and 17 are bent due to the reaction force during the bending process. Among the products), which resulted in variations in products. In addition, stays 18 and 19
In addition, the bases 16 and 17 need to be thick and strong, so that the apparatus becomes large and heavy (this still causes inconsistency). Cylinder 12,1
5, The whole device is designed and arranged in consideration of the position and direction of the receiving roll 11 and the bending roll 14, so it takes a long time for manufacturing such as assembly and adjustment, and the device will not be in time at the start of mass production.
In addition, there are also problems that the number of parts is large, the number of movable parts is large, the manufacturing cost is extremely high, and the durability is poor.

Therefore, an object of the present invention is to reduce the processing time by completing one bending operation in one operation, to minimize the above-mentioned irregularity (breathing), and to reduce the size and weight. It is to provide a bending device.

(Means for Solving the Problems) In order to achieve the above object, in the bending apparatus for a small-diameter metal pipe according to the present invention, a bar or a pipe is connected to form a bent shape over the entire length of the metal pipe. A fixed formwork that is formed into a conforming figure shape and has a guide surface at a bent portion having a curvature in a longitudinal direction smaller than a bending radius of the metal tube and a transverse direction substantially perpendicular to a bending 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 toward the fixed formwork. A fixed formwork having a guide surface formed of a surface substantially parallel to a bending plane at a bending portion and having a shape substantially conforming to a bending shape over the entire length of the metal tube; and in a direction substantially perpendicular to the guide surface. Standing on the fixed formwork and A guide member having a curvature smaller than a bending radius of the metal tube; and a bending member moving toward the fixed form so that the metal tube is bent along the guide surface and the guide member. A fixed formwork formed by connecting materials or pipes to a shape substantially conforming to a bent shape over the entire length of the metal pipe; a longitudinal direction provided on the fixed formwork, the longitudinal direction of which is smaller than a bending radius of the metal pipe; At least one having a first guide surface having a curvature and having a width direction substantially perpendicular to a bending plane.
Two first bending portions; a second guide surface provided on the fixed formwork, the second guide surface being substantially parallel to a bending plane;
At least one second bent portion provided with a guide member which is erected on the fixed form in a direction substantially perpendicular to the guide surface and has a curvature smaller than a bending radius of the metal tube;
In the bending section, the first pipe moves toward the fixed form so that the metal pipe is bent along the first guide surface.
The gist comprises a bending member; and a second bending member that moves toward the fixed mold so that the metal pipe is bent along the second guide surface and the guide member in the second bending portion. Further, a fixed form formed by connecting the rods or pipes by welding is formed to have a substantially rectangular cross section, the guide member is formed in a plate shape or a block shape, and the bending member is driven by an air cylinder. It is composed of rolls to be performed.

(Operation) According to the present invention, since the bending can be performed immediately by merely moving the bending member (for example, a bending roll) toward the mold and pressing against the metal pipe as described above, the bending is performed by one bending. Only one operation per machining is required, thus shortening the machining time. In addition, the deviation caused by the conventional bending process can be minimized because the fixed formwork is used in the present invention. Furthermore, in the present invention, a formwork that can be easily manufactured by welding or the like is fixed to the column, and the bending members are arranged along the formwork, so that the number of parts is reduced, the apparatus can be downsized, and the weight can be reduced. In addition, the number of movable parts can be reduced and the life can be extended.

(Embodiment) FIG. 1 is a partial perspective view showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, and FIG.
4 (a) and 4 (b) are enlarged sectional views taken along the lines CC and C'-C ', respectively, and FIG. 5 is a sectional view taken along the line DD in FIG. FIG. 6 is a sectional view of another embodiment, FIG. 6 (a) is an enlarged view of a main part of FIG. 6, and FIG. 7 is a sectional view of still another embodiment. As shown in the drawing, reference numeral 1 denotes a first surface which substantially conforms to the bending shape over the entire length of the metal tube 2 and has a surface in the width direction substantially perpendicular to the bending plane in the vicinity of the bending portion, preferably within a bending angle range. A bar (see FIGS. 2 to 5) and a pipe (see FIG. 7) having a guide surface 1 'and a second guide surface 1 "comprising a surface substantially parallel to the bending plane are connected by welding 9. This is a fixed form of long material that is continuous and has a flat portion in the cross-sectional contour, and is preferably formed in a substantially rectangular cross-section, but the cross-sectional shape of the second guide surface 1 ″ is not limited thereto. In this case, the second guide surface 1 ″ may be a guide member 3 described later.
Means a surface formed by a tangent to the outer peripheral surface of the metal tube 2 extending in a direction substantially perpendicular to the direction. A required position of the mold 1 to be bent of the metal tube 2 is substantially perpendicular to the first guide surface 1 ′ and the second guide surface 1 ″ having a curvature smaller than the bending radius of the metal tube 2. And a guide member 3 erected by welding, etc. The first guide surface 1 ',
The curvatures and shapes of the second guide surface 1 ", the guide member 3, the mold frame 1, etc. are determined in consideration of the springback of the metal tube 2 during bending. The guide member 3 is shown in FIG. )
And may be formed in a block shape as shown in FIG. 4 (b). The formwork 1 is fixed on the base 6 by a necessary number of columns 4, but in the present invention, unlike the conventional example, the base 6 is not necessarily required if the columns 4 are connected to each other. Reference numeral 5 denotes a bending member arranged so as to be able to move toward the fixed formwork 1 while pressing the metal tube 2 along the guide member 3 with the first guide surface 1 'or the second guide surface 1 ". The bending member for bending on the surface 1 'is arranged so that the outer peripheral surface thereof faces the first guide surface 1', and the bending member for bending on the second guide surface 1 "and the guide member 3 is provided. The members are arranged so that their moving directions are substantially parallel to or slightly inclined with respect to the second guide surface 1 ". In addition, 5 'indicates a bending member indicating a position before machining, and bending member 5 is usually the sixth member. As shown in the figure, a bending member 5 is provided at the tip of a piston rod 8 operated by an air cylinder 7 fixed to a stay 4 'fixed to a base 6, and the backlash of a piston rod bush is provided at the tip of the piston rod 8. Amplify at In order to prevent the piston rod 8 from being retracted, it is preferable to perform bending by retracting the piston rod 8 and bringing the bending member 5 into contact with the metal pipe 2. In addition, as shown in FIG. Even in the case of performing the working, since the fixed formwork 1 is firmly fixed to the base 6 by the columns 4, the precision of the bending work can be sufficiently maintained. Not only those driven by
It may be driven by a rotary actuator, or a bending roll may be provided on a handle, and an operator may operate the handle to perform bending.

Next, the bending process of the metal tube 2 is performed by first forming the straight metal tube 2.
Is fixed with a stopper or the like to determine the size of the bent portion, or a fixed position of the intermediate portion is fixed with a clamp device or the like to determine the size of the bent portion. Next, in the former, the bending member 5 is sequentially moved from the fixed end to the free end side, and in the latter, from the fixed portion to both free ends.
The metal pipe 2 is pressed against the first guide surface 1 ′ or the second guide surface 1 ″ of the mold 1 along the guide member 3 while moving forward or in a circular motion toward, and bending is performed. The apparatus of the present invention can be used not only for metal pipes but also for bending rods.

(Effects of the Invention) As described above in detail, according to the present invention, the bending member operates toward the mold and the metal tube is connected to the first guide surface or the second guide surface and the guide member of the mold. One bending operation is completed by one operation, so the bending time can be shortened, and even when a cylinder is used to move the bending member, a rigid frame that is fixed by the support column is used. Therefore, the above-mentioned deviation is minimized, and a product having a highly accurate bent shape can be obtained. In addition, after cutting and bending a commercially available square bar or the like to a required length, the metal tube is continuously connected by welding or the like so as to substantially match the bent shape over the entire length of the metal tube, and further, a plate-shaped guide member is connected. Since the entire bending machine can be configured by simply erected at a predetermined position to form a mold and arranging a bending member so as to operate toward the mold, the number of parts is significantly reduced as compared with the conventional example. The number of movable parts can be reduced, and high bending accuracy can be maintained for a long time. In addition, downsizing and weight reduction can be achieved. Manufacturing costs can be reduced significantly. There is an extremely large effect such as that it can be placed in a movable state.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing one embodiment of a bending apparatus for a small diameter metal pipe of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is B of FIG. FIG. 4 (a) and FIG. 4 (b) are CC and C ′ in FIG. 1, respectively.
FIG. 5 is an enlarged sectional view taken along the line DD in FIG. 1, FIG. 6 is a sectional view of another embodiment, and FIG. 6 (a).
6 is an enlarged view of a main part of FIG. 6, FIG. 7 is a sectional view of still another embodiment, and FIG. 8 is a perspective view showing a conventional bending apparatus. DESCRIPTION OF SYMBOLS 1 ... Fixed formwork, 1 ', 1 "... Guide surface, 2 ... Metal pipe, 3 ... Guide member, 4 ... Prop, 5 ... Bending member,
6 ... base, 7 ... cylinder, 8 ... piston rod,
9 ... welding, 11 ... receiving roll, 12, 15 ... cylinder, 1
3 ... Metal tube, 14 ... Bending roll

Claims (14)

(57) [Claims] A bar or tube is connected to form a shape substantially matching the bent shape of the metal tube over its entire length, and the curvature of the bent portion in the longitudinal direction is smaller than the bending radius of the metal tube. A fixed formwork having a guide surface comprising a surface substantially perpendicular to a bending plane in a width direction; and an outer peripheral surface facing the guide surface so that the metal tube can be bent along the guide surface, and the fixed form. A bending member for moving toward a formwork; 2. A bending apparatus for a metal pipe having a small diameter according to claim 1, wherein the bar or the pipe has a substantially rectangular cross section. 3. The bending apparatus according to claim 1, wherein the rods or the pipes are connected by welding. 4. An apparatus according to claim 1, wherein the bending member comprises a roll driven by an air cylinder. 5. A bar or tube member is connected to form a figure substantially conforming to a bent shape over the entire length of the metal tube, and has a guide surface formed of a surface substantially parallel to a bending plane at a bent portion. A fixed formwork; a guide member erected on the fixed formwork in a direction substantially perpendicular to the guide surface and having a curvature smaller than a bending radius of the metal tube; and a metal tube bent along the guide surface and the guide member. A bending member that moves toward the fixed formwork so as to be able to be bent. 6. The bending apparatus according to claim 5, wherein the bar or the tube has a substantially rectangular cross section. 7. An apparatus for bending a small-diameter metal pipe according to claim 5, wherein the bar or the pipe is connected by welding. 8. The bending apparatus according to claim 5, wherein the guide member has a plate shape or a block shape. 9. An apparatus according to claim 5, wherein the bending member comprises a roll driven by an air cylinder. 10. 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 tube; and a metal provided in the fixed form in a longitudinal direction. At least one first bending portion having a first guide surface having a curvature smaller than a bending radius of the pipe and having a width direction substantially perpendicular to a bending plane; bending provided on the fixed formwork; At least one comprising: a second guide surface formed of a surface substantially parallel to a plane; and a guide member erected on the fixed form in a direction substantially perpendicular to the second guide surface and having a curvature smaller than a bending radius of the metal tube. Two second bending portions; a first bending member that moves toward the fixed form so that the metal pipe is bent along the first guide surface in the first bending portion; and the second bending portion. In the part, the second guide surface and the guide A second bending member to move toward the fixed mold so that the metal tube is bent along the member;
Machine for bending small diameter metal pipes. 11. The apparatus for bending a small diameter metal pipe according to claim 10, wherein the rod or the pipe has a substantially rectangular cross section. 12. The apparatus for bending a small-diameter metal pipe according to claim 10, wherein the bar or the pipe is connected by welding. 13. The bending apparatus for a small-diameter metal pipe according to claim 10, wherein the guide member has a plate-like shape or a block shape. 14. The bending apparatus according to claim 10, wherein the first or second bending member comprises a roll driven by an air cylinder.