JPH0512050B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a bending device that performs bending along the axis of a long workpiece in which an opening groove is formed along the longitudinal direction. Regarding.

(Prior Art) An example of a workpiece in which a long workpiece having an opening groove formed in the longitudinal direction is bent is a seatbelt guide for a passive seatbelt for an automobile. Passive seatbelts automatically activate the seatbelt to keep the occupant restrained when the occupant sits in the seat and closes the door. ), and the other end is fixed to the side of the cable that slides back and forth along a seat belt guide provided on the periphery of the window frame as shown in FIG.

The seat belt guide is an extruded aluminum alloy material, and as shown in Fig. 9, the seat belt guide has a cross section with an opening groove 1 along the longitudinal direction so that the cable to which the other end of the seat belt is attached can slide. It has a concave shape. Then, as shown in Figure 7, it is bent so that it has curvatures of R ₁ , R ₂ , R ₃ , R ₄ , and R ₅ in the two-dimensional direction, and furthermore, in the three-dimensional direction perpendicular to this, it conforms to the curved shape of the vehicle body. As shown in Figure 8,
It is necessary to bend it so that it has a curvature of R ₆ .

For bending such long workpieces, for example, a bending apparatus as shown in FIG. 10 is used.

The bending device shown here includes a delivery device 5 equipped with two sets of delivery rollers 3, and upper and lower support rollers 7 and left and right support rollers 9 that are located in front of the delivery device 5 in the delivery direction and serve as bending support points for the workpiece W. and a vertical bending roller 13 which is located further forward of the support device 11 and serves as a bending point for the workpiece W.
and a bending device 17 equipped with left and right bending rollers 15. The bending device 17 bends the workpiece W three-dimensionally by swinging the bending point of action horizontally around the vertical axis 21 or vertically around the horizontal axis 23 with respect to the body 19. Bending process is applied to.

At this time, the bending process is performed using the upper and lower, left and right bending rollers 13 and 15 of the bending device 17 as working points, and the upper and lower and left and right support rollers 7 and 9 as bending support points, but the workpiece W is Since the opening groove 1 is formed as shown in FIG.
5 and 27 may fall toward the opening groove 1 side and become deformed. In order to prevent this, during this bending process, a metal support die D is attached near the bending support point of the support device 11, and the inside of the opening groove 1 of the workpiece W is in sliding contact with the metal support die D. I'm going there.

The support die D is made of tool steel or the like and quenched and hardened to improve wear resistance, and has a shape that matches the cross-sectional shape of the opening groove 1 of the workpiece W, as shown in FIGS. 11 and 12. It has a cross-sectional shape, and has a slight gap t with the inner surface of the opening groove 1 when both the lower surface and the side surface are inserted. For example, when bending the workpiece W upward, the upper and lower bending rollers 13 of the bending device 17 serve as the bending action point, while the upper and lower support rollers 7 of the support device 11 serve as the bending support point, and as the workpiece W is sent out, The upper and lower support rollers 7 are strongly pressed against the lower surface of the workpiece W and the upper surface on the opening groove 1 side.

(Problem to be Solved by the Invention) At this time, the inner bottom surface 1a of the opening groove 1 of the workpiece W is
Since the support die D is strongly pressed against the bending fulcrum 28a located near the tip of the lower surface 28, the workpiece W made of a relatively soft aluminum alloy has its bottom surface 1a shaved off by the hard support die D as in a so-called cutting process. , the shavings A will accumulate as shown in FIG.

The accumulated shavings A not only damage the inner bottom surface 1a of the opening groove 1 when the workpiece W is sent out, but also
When the bending curvature of the workpiece W changes from a small one to a larger one as the workpiece is fed out, that is, the upper and lower bending rollers 13, which are the bending points, move downward and the workpiece W approaches a state closer to a straight line. At this time, the pressing force of the bottom surface 1a against the support die D is weakened, so that the bending process ends with the pieces locally attached to the workpiece W, as shown in FIG.

In this way, if the inner surface of the opening groove 1 of the workpiece W is scratched or if shavings are locally collected and attached, the sliding resistance of sliding members such as cables sliding inside the opening groove 1 will be reduced. As a result, the sliding member may be damaged or the seat belt may not be able to extend smoothly.

Therefore, this invention aims to change the cross-sectional shape by bringing the inside of the opening groove into sliding contact with a support die when bending a moving long workpiece that has an opening groove in which other members can slide. The purpose of this invention is to maintain a stable sliding state so that the sliding resistance of other members within the opening groove does not increase locally even when the sliding resistance is prevented.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a method for fixing a long workpiece in which an opening groove having a substantially constant cross-sectional shape along the longitudinal direction is formed. a bending device that is located in front of the feeding device in the feeding direction and has a bending point of action on the workpiece and performs bending; and a bending device that is interposed between the feeding device and the bending device. and a support device that supports the workpiece by having a bending support point for the workpiece, and the support device is provided with a support die that is inserted into the opening groove of the workpiece near the bending support point to provide support during bending. A concave portion extending along the workpiece delivery direction is formed on the bending and pressure contacting surface of the die against the inner surface of the opening groove.

(Function) The workpiece delivered by the delivery device and reaching the support device is now in a state where the support die is inserted into the opening groove. When the workpiece is further sent out with the support die sliding against the opening groove and reaches the bending device, the bending device operates so that the bending device side becomes the bending point of action, while the support device side becomes the bending support point. Bending processing is performed. At this time, the inner surface of the opening groove of the workpiece and the bending pressure contact surface of the support die are strongly pressed at the bending support point, but since a recess is formed in the bending pressure contact surface, parts other than the recess are attached to the inner surface of the opening groove. The plastic deformation occurs by biting into the recess, and the plastic deformation portion that is removed thereby moves to either side of the recess. As a result, a series of grooves and protrusions are formed on the inner surface of the opening groove along the delivery direction of the workpiece. Since these grooves and protrusions are formed along the longitudinal direction of the workpiece, that is, the sliding direction of the member sliding in the opening groove, there may be a local portion that obstructs the sliding of the sliding member. There is no such thing, resulting in a stable sliding condition.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

Figure 1 shows a workpiece W bent with respect to its axis, which is a long extruded material made of light alloy such as aluminum, which forms the seat belt guide of the passive seat belt for automobiles shown in Figures 7 to 9. It is a side view of the bending processing device which performs processing. In FIG. 1, the work W is set so that the opening groove 1 is on the upper side in the figure. This bending device includes a delivery device 29 for delivering the workpiece W, and a delivery device 29 located in front of the delivery device 29 in the workpiece delivery direction.
It is comprised of a bending device 31 that performs bending on a workpiece W, and a support device 33 that is interposed between the delivery device 29 and the bending device 31 and supports the workpiece W.

In the delivery device 29, two sets of delivery rollers 39, which are rotated by a drive source (not shown), are arranged above and below the workpiece W, front and rear, and send out the workpiece W toward the support device 33. The support device 33 is rotatably provided with a vertical support roller 41 that supports the workpiece W from the top and the bottom and a left and right support roller 43 that supports the left and right sides of the workpiece W on the front side in the delivery direction of the workpiece W. These support rollers 41 and 43 serve as support points for bending the workpiece W. A support roller 45 for supporting the workpiece W is also rotatably provided on the rear side of the support device 33 in the workpiece delivery direction.

A support die D is attached to the support device 33 through an attachment hole 47 coaxially with the upper support roller 41 among the upper and lower support rollers 41 . Like the conventional example, the support die D is made of tool steel or the like and is quenched and hardened to improve wear resistance, and the portion accommodated in the opening groove 1 is polished to a mirror finish. The lower part of the front end of the support die D in the feeding direction of the workpiece W is formed in a curved shape, and a relief groove 51 as a recess is provided in the curved surface portion 49 that becomes the bending and pressure contact surface, as shown in FIGS. 5 and 6. It is being Relief groove 51
is formed extending along the delivery direction of the workpiece W over almost the entire curved surface portion 49 at the center of the support die D in the thickness direction (direction perpendicular to the paper surface of FIG. 4);
The lower end 51a of the support die D is located slightly rearward in the workpiece delivery direction from the bending fulcrum S where the bottom surface 1a of the opening groove comes into pressure contact with the support die D when the workpiece is bent. By providing such an escape groove 51, protrusions 53 are formed on both sides thereof.

The bending device 31 includes a fuselage 111, a base 113 on the fuselage 111, an outer frame 115 on the base 113,
and the inner frame 9 supported by the outer frame 115
It has 9.

As shown in FIG. 3, which is a view taken in the direction of the arrows in FIG. 1, the base 111 has an upper surface formed in a semi-circular concave curved surface, and a concave groove 117 is formed to extend in the arc direction. On the other hand, the lower surface of the base 113 is formed with a convex arcuate surface matching the arcuate surface of the body 111, and a convex rail 119 that slides into a concave groove 117 is formed here. A toothed portion is formed on the lower surface of the convex rail 119 over almost the entire length, and this toothed portion meshes with a drive gear 121 attached to the body 111. Drive gear 121
is driven by a drive source such as a motor (not shown),
By this drive, the base 113 swings along the concave groove 117, and the workpiece W is twisted. The centers of the arcuate surfaces of the concave surface of the body 111 and the convex surface of the base 113 coincide with the longitudinal axis of the workpiece W, that is, the center of twisting when the workpiece W is twisted.

The outer frame 115 has a hollow rectangular cross section, and is attached to the base 113 so as to be rotatable about a vertical axis 123. Outer frame 115
An arcuate toothed portion 125 centered on the axis of the vertical shaft 123 is formed on the lower side surface of the rotor, and a worm gear 127 that is rotated by a drive source such as a motor (not shown) meshes with the toothed portion 125. . Due to the rotation of the worm gear 127, the outer frame 115 is aligned with the vertical axis 1.
23, thereby bending the workpiece W in the left-right direction.

The inner frame 99 is formed to have a hollow rectangular cross section similar to the outer frame 115.
It is rotatably supported via a horizontal shaft 129 relative to the main body. One end of the horizontal shaft 129 projects outward from the outer frame 115, and a gear 131 is attached to this projecting end. The gear 131 includes a worm gear 13 that is rotated by a drive source such as a motor (not shown).
3 are engaged. The rotation of the worm gear 133 causes the inner frame 99 to rotate about the horizontal shaft 129, thereby bending the workpiece W in the vertical direction.

The inner frame 99 is rotatably mounted with a vertical bending roller 135 that is a point of action for bending and rolls in contact with both the upper and lower surfaces of the workpiece W.
Left and right bending rollers 139, which contact and roll on both left and right sides of the workpiece W and serve as application points for bending, are rotatably mounted. Further, an auxiliary roller 141 that contacts the lower surface of the workpiece W is rotatably mounted on the inner frame 99.

In the bending apparatus configured in this way, when the workpiece W is sent out by the delivery device 29 and reaches the support device 33, the support die D is inserted into the opening groove 1.
is inserted, and the workpiece W is further delivered to the bending device 31 while the support die D is in sliding contact with the opening groove 1. When the workpiece W reaches the bending device 31 and is bent, for example, upwardly with a small curvature, the inner frame 99 rotates upwardly about the horizontal axis 129. At this time, the work W slides with respect to the support die D and uses the upper and lower bending rollers 135 of the bending device 31 as bending points, while the upper and lower support rollers 4 of the support device 33
1 as the bending support point, it can be bent significantly upward.

During this bending process, the workpiece W supported by the upper and lower support rollers 41 moves while the inner bottom surface 1a of the opening groove 1 is strongly pressed against the protrusion 53 of the support die D at the bending fulcrum S. The support die D is made of hardened tool steel or the like, and the workpiece W is made of a soft material such as an aluminum alloy. Therefore, when the support die D and the workpiece W are strongly pressed against each other, the protrusion 5
3 bites into the bottom surface 1a of the opening groove 1 to plastically deform it, and the plastically deformed portion of the workpiece W that is removed by the biting of the protrusion 53 enters either side of the protrusion 53. As a result, the shavings produced by cutting the inner surface of the opening groove by the support die D are prevented from being locally collected and attached. By sequentially moving the plastic deformation portion to either side of the protrusion 53 as the workpiece W is delivered, a groove corresponding to the protrusion 53 is formed in the bottom surface 1a of the opening groove 1 of the workpiece W. A protrusion or the like corresponding to the escape groove 51 is formed in series along the longitudinal direction of the workpiece W.

After the workpiece W is bent in this way, when it is manufactured into a product and assembled into a vehicle body as a seatbelt guide, a sliding member such as a cable to which the end of the seatbelt is connected is inserted into the opening of the seatbelt guide. Although it slides within the groove 1, the protrusions that come into sliding contact with a sliding member such as a cable are formed in a series in the longitudinal direction, so there are no localized portions that would impede the sliding of the sliding member. As a result, damage to the sliding member is prevented, and the seat belt can be smoothly extended.

In addition, in the above embodiment, an example was shown in which the escape groove 51 was formed from the lower part of the front end of the support die D to the lower surface in order to prevent the generation of shavings during bending with a small upward curvature, but the present invention is not limited to this. Instead, when bending is performed with a small curvature in the left-right direction, if a clearance groove is formed from the tip of the support die D to the side surface, the generation of scraps can be similarly prevented.

[Effects of the Invention] As described above, according to the present invention, the inner surface of the opening groove of the support die inserted into the opening groove of the workpiece delivered by the delivery device to prevent deformation of the workpiece during bending. Since a recess is formed on the bending pressure contact surface with the
The plastically deformed part within the opening groove that was excluded by the part other than the recess of the support die at the bending support point enters either side of the part other than the recess, and thereby a protrusion is formed in the longitudinal direction within the opening groove. Since they are formed in series, the sliding resistance of the sliding member does not locally increase, and a stable sliding state can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a bending device showing an embodiment of the present invention, FIG. 2 is a top view of FIG. 1, and FIG.
The figure is a view taken in the direction of the arrow in Fig. 1, Fig. 4 is an enlarged explanatory view of the bending support point in Fig. 1, Fig. 5 is a right side view of Fig. 4, and Fig. 6 is a - cross section of Fig. 4. Fig. 7 is a side view of the seat belt guide after processing the workpiece, Fig. 8 is a view in the direction of the arrow in Fig. 7, Fig. 9 is an enlarged cross-sectional view of Fig. 7, and Fig. 10 is a conventional 11 is an enlarged explanatory view of the bending support point in FIG. 10, FIG. 12 is a right side view of FIG. 11, and FIGS. 13 to 15 are operations of the conventional device. It is an explanatory diagram. W... Work, D... Support die, 1... Opening groove, 29... Delivery device, 31... Bending device, 33
...Support device, 49...Curved surface part (bending pressure contact surface),
51...Escape groove (recess).

Claims (1)

[Claims] 1. A delivery device that sends out a long workpiece in the longitudinal direction, in which an opening groove with a substantially constant cross-sectional shape is formed, and a device that is located at the front side of the delivery device in the delivery direction and that bends the workpiece. It is equipped with a bending device that performs bending processing by having a bending point, and a support device that is interposed between the sending device and the bending device and that has a bending support point for the workpiece and supports the workpiece. A support die is provided to be inserted into the opening groove of the workpiece near the bending support point, and a recess extending along the delivery direction of the workpiece is formed on the bending pressure surface of the support die against the inner surface of the opening groove during bending. A bending device for long workpieces, which is characterized by: