JPH066214B2 - Bending method for long workpieces - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to a bending method for bending a long work having an opening groove formed along the longitudinal direction.

(Prior Art) A seat belt guide for an automobile passive seat belt made of a long work having an opening groove is referred to as No. 22.
As shown in the figure, R ₁ , R ₂ , R ₄ , and R ₅ in the two-dimensional direction
It is necessary to bend so as to have a curvature of R ₆ and to bend so as to have a curvature of R _{6 in} the three-dimensional direction orthogonal to this, according to the curved shape of the vehicle body, as shown in FIG. Further, as shown in FIG. 24, the cross-sectional shape of this seat belt guide is a concave shape in which opening grooves 1 for guiding the belt along the longitudinal direction are formed in series.

For bending such a long work, for example, a bending apparatus as shown in FIG. 25 is used. The bending apparatus shown here is a feeding device 5 including two feeding rollers 3.
And the upper and lower support rollers 7 and the left and right support rollers 9 which are located in front of the delivery device 5 in the delivery direction and serve as bending support points for the work W.
And a vertical bending roller 13 which is located further in front of the supporting device 11 and serves as a bending action point of the work W.
And a bending device 17 having a left and right bending roller 15. The bending device 17 has a bending point of the body 19
On the other hand, the work W is three-dimensionally bent by swinging in the left-right direction around the vertical axis 21 or in the up-down direction around the horizontal axis 23.

At this time, the upper and lower and left and right bending rollers 1 of the bending device 17
Bending processing is performed by using the upper and lower and left and right support rollers 7 and 9 as bending support points while using 3, 15 as action points, but since the work W has the opening groove 1 formed as described above,
There is a risk that the flanges 25 and 27 on both sides of the flange 25 may fall toward the opening groove 1 side and be deformed. In order to prevent this, at the time of this bending process, a metal shoe is slidably contacted in the opening groove 1 near the bending support point.

(Problems to be Solved by the Invention) However, in this case, since the shoe is fixed to the supporting device 11 and is in sliding contact with the moving work W, the surface thereof is relatively small like a light alloy material such as aluminum or magnesium. A soft work causes scratches at a portion that is in strong sliding contact with the shoe, for example, a curved portion W ₂ or W ₄ having a small curvature such as curvatures R ₂ and R _{4 in} FIG. 22, which is particularly severe. In this case, the surface will be scraped and burr will be generated. If scratches, burrs, or the like occur in the opening groove 1, the sliding resistance of the seat belt increases, and the seat belt may not be able to be smoothly fed out or may be damaged.

Therefore, according to the present invention, when bending a long work having an opening groove, even if the core material is inserted into the opening groove to prevent the cross-sectional shape from changing, the inner surface of the opening groove is prevented. The purpose is to keep smooth.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention uses a feeding device to form a long work having an opening groove having a substantially constant cross-sectional shape in the longitudinal direction. The core material made of a flexible material is inserted into the opening groove of the delivered workpiece, the core material is moved in synchronization with the movement of the workpiece, and is moved integrally with the core material. While the work to be supported is supported by a supporting device having a bending supporting point, bending is performed by a bending device having a bending action point on the front side of the supporting device in the work feeding direction, and the core material is removed from the opening groove of the processed work. It is the one.

In the present invention, the insertion of the core material into the groove between the works includes both the one inserted from the opening and the one inserted from the end, and the removal of the core material from the opening groove of the work may be removed from the opening. It also includes those that leave the terminal.

(Operation) As the work is delivered by the delivery device, the core material moves in synchronization with the work while being inserted into the opening groove of the work. The work moving together with the core material is bent at the bending action point while being supported by the bending support point. At this time, the core material in the opening groove prevents the cross-sectional shape of the work from being deformed. Moreover, since the core material moves in synchronization with the workpiece, the core material and the workpiece do not come into sliding contact with each other, and therefore the insertion of the core material does not cause scratches or the like in the opening groove. The groove surface is kept smooth.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 21.

FIG. 1 shows a bending apparatus for bending a long work W made of a light alloy such as aluminum forming the seat belt guide of the passive seat belt for an automobile shown in FIGS. 22 to 24. It is a side view. In FIG. 1, the work W is set so that the opening groove 1 is on the upper side in the drawing. This bending apparatus includes a feeding device 29 for feeding the work W, a bending device 31 located in front of the feeding device 29 in the work feeding direction for performing bending work on the work W, and between the feeding device 29 and the bending device 31. A support device 33 for supporting the work W, and a flexible endless belt-shaped core material 35 having excellent mechanical properties such as polyacetal resin and fatigue resistance in the opening groove 1 of the work W. It is composed of a core material conveying device 37 for inserting and removing.

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 work W,
The work W is sent toward the support device 33. Support device 3
As shown in FIG. 4 which is a sectional view taken along the line IV-IV in FIG. 1, the upper and lower support rollers 41 for supporting the upper and lower sides of the work W on the front side in the feeding direction of the work W, and the left and right sides of the work W are supported by 3. The left and right support rollers 43 are rotatably provided. Each of the support rollers 41 and 43 is a bendable support point for the work W. A support roller 45 that supports the lower surface of the work W is rotatably provided on the rear side of the support device 33 in the work delivery direction.

On the upper surface of the work W at the position facing the support roller 45,
A core material insertion mechanism 47 that constitutes a part of the transport device 37 that transports the core material 35 is provided. The conveying device 37 includes the core material inserting mechanism 47, a core material removing mechanism 49 attached to the bending device 31, and a tension roller 51 located above the supporting device 33 and applying tension to the core material 35. And a tensioner mechanism 53.

The core material insertion mechanism 47 will be described with reference to FIGS. 5 to 10. The core material insertion mechanism 47 includes a guide roller 55 shown in FIG. The guide roller 55 has a guide groove 57 formed in the center and step portions 59 and 61 on both sides thereof, and the core material 35 is housed and guided in the guide groove 57. A pressing member 63 shown in FIGS. 7 and 8 is provided on the delivery device 29 side of the guide roller 55.

The holding member 63 is rotatable about a support shaft 65, and a tension spring 71 is provided between the pin 67 on the upper end side and a pin 69 attached to the support device 33, and the holding member 73 on the lower side holds the core. The material 35 is pressed down. Presser 73
Is a tongue piece 75 that extends downward and holds down the core member 35,
The guide roller 55 is formed on both sides of the tongue piece 75 so as to be shorter than the tongue piece 75, and the step portion of the guide roller 55 enters the guide portions 59 and 61. The guide roller 55 side surface has an arc shape concentric with the guide roller 55. Is formed in. Also,
The upper portion of the work W is inserted in the step portions 59 and 61 of the guide roller 55. Further, at the lower end of the pressing member 63, a pair of positioning projections 79 are provided so as to sandwich the work W from both sides.

On the opposite side of the guide roller 55 from the pressing member 63, the core member 3
A guide member 81 is provided which has a function of causing the workpiece 5 to enter the opening groove 1 of the work W. The guide member 81 is fixed to the support device 33 by two front and rear pins 83, and the tip of the guide member 81 has a guide roller 55 as shown in FIG. 9 and FIG.
Is provided with a projecting piece 85 that enters the guide groove 57 of
A surface of the guide roller 55 which faces the guide groove 57 and the step portions 59 and 61 is formed in an arc shape concentric with the guide roller 55.
5 is in contact with the lower part on the front side in the workpiece delivery direction, which is approximately 1/4 in the circumferential direction. On the other hand, the lower end surface 87 of the guide member 81 is substantially in contact with the upper surface of the work W, and a gentle arc is formed between the trailing edge of the lower end surface 87 in the work delivery direction and the lower end of the arc surface of the guide member 81. An inclined surface 89 is formed.
The inclined surface 89 is located on a gentle arc connecting the rear end edge of the lower end surface 87 of the guide member 81 in the workpiece delivery direction and the bottom surface of the guide groove 57 of the guide roller 55. This allows
After being guided by the inclined surface 89, the core material 35 is pressed against the lower end surface 87 and inserted into the opening groove 1 of the work W.

The core material removing mechanism 49 has a take-up roller 91, and
As shown in detail in FIGS. 12 and 13, the take-up roller 91
A guide groove 93 for guiding the core material 35 is formed in the. The take-up roller 91 is rotatably attached to the bracket 97 via the support shaft 95, and
Is fixed to the inner frame 99 of the bending device 31 by a bolt 105 to a rotating member 103 that is rotatable via a support pin 101.

The endless belt-shaped core material 35 which is inserted into and removed from the opening groove 1 of the work W by the core material conveying device 53 is, as shown in FIG. 13 to FIG. Many slits 107 are formed at intervals. The slit 107 is formed in a direction orthogonal to the longitudinal direction of the core material 35, and its tip 107 a has an opening groove 1 of the work W.
It is located in the vicinity of the contact surface 107b with the bottom surface and gradually expands from the tip 107a toward the opening 107c in the inner portion. Further, the core material 3 is provided between the slits 107.
A reinforcing pin 109 made of a rigid material such as metal and having a length substantially equal to the depth of the slit 107 is embedded so as to extend from the inner end of the member 5 to the vicinity of the contact surface 107b.

The bending device 31 includes a body 111 and a base 11 on the body 111.
3, an outer frame 115 on the base 113, and the above-mentioned inner frame 99 supported by the outer frame 115.

As shown in FIG. 3 which is a view taken along the arrow III in FIG. 1, the machine body 111 has an upper surface formed in a semi-circular concave curved surface, and a concave groove 117 is formed in the concave curved surface to extend in the circular arc direction. There is.
On the other hand, the lower surface of the base 113 is formed with a convex arcuate surface in conformity with the arcuate surface of the machine body 111, and a convex rail 119 that slides into the concave groove 117 is formed therein.
Teeth are formed on the lower surface of the convex rail 119 over substantially the entire length, and the teeth engage with the drive gear 121 attached to the machine body 111. The drive gear 121 is driven by a drive source such as a motor (not shown), and this drive causes the base 113 to swing along the concave groove 117 and twist the work W. Concave surface of machine body 111 and base 1
The center of the arcuate surface of the convex surface of 13 coincides with the longitudinal axis of the work W, that is, the twist center when the work W is twisted.

The outer frame 115 has a rectangular cross section,
It is attached to the base 113 so as to be rotatable about the vertical axis 123. On the lower side surface of the outer frame 115, arcuate teeth 125 centered on the axis of the vertical axis 123 are formed, and a worm gear 127 rotated by a drive source such as a motor (not shown) meshes with the teeth 125. There is. The rotation of the worm gear 127 causes the outer frame 115 to move to the vertical axis 1
The workpiece W is bent in the left-right direction by rotating about 23.

Like the outer frame 115, the inner frame 99 is formed in a hollow rectangular shape and has a horizontal axis 12 with respect to the outer frame 115.
It is rotatably supported via 9. One end of the horizontal shaft 129 protrudes from the outer frame 115 to the outside, and a gear 131 is attached to this protruding end. A worm gear 133 that is rotated by a drive source such as a motor (not shown) meshes with the gear 131. The rotation of the worm gear 133 causes the inner frame 99 to rotate about the horizontal shaft 129, whereby the work W is bent in the vertical direction.

The inner frame 99 is rotatably mounted with upper and lower bending rollers 135, which are contact points on the upper and lower surfaces of the work W to roll, and serve as points of action for bending, and also contact and roll on the left and right surfaces of the work W. A left and right bending roller 139, which serves as a point of action for bending, is rotatably mounted. Further, the inner frame 99 has an auxiliary roller 141 that contacts the lower surface of the work W.
Is rotatably attached.

In the bending apparatus configured as described above, when the work W is delivered by the delivery device 29 and reaches the support device 33, the core material 35 being delivered by the core material delivery device 37 in synchronization with this is inserted into the core material. Guide roller 55 of mechanism 47
18 and then is guided and guided along the inclined surface 89 of the guide member 81 and gradually inserted into the opening groove 1 of the work W, and is pressed against the lower end surface 87, as shown in FIG. It completely enters the opening groove 1. At this time, the pressing portion 73 of the pressing member 63 is changed to the step portion 5 of the guide roller 55.
The tongue piece 75 presses the core material 35 and prevents the core material 35 from coming off the guide roller 55.
Further, the positioning projection 79 at the lower end of the pressing member 63 positions the work W in the left-right direction so as to sandwich the work W from both sides.
The guide roller 55 side is firmly pressed against the position 5 without being displaced. After the core material 35 has entered the opening groove 1, the core material 35 is conveyed integrally with the work W in synchronization with the delivery operation of the work W.

When the work W delivered together with the core material 35 passes through the support device 33 and reaches the vertical bending roller 135 and the horizontal bending roller 139 of the bending device 31, the base 113 swings, the outer frame 115 rotates, or By the rotation of the inner frame 99, the work W uses the portions of the vertical bending roller 135 and the horizontal bending roller 139 as bending action points, and the portions of the vertical and horizontal support rollers 41 and 43 as bending support points.
Twisting, horizontal bending or vertical bending is performed.

At the time of such bending, the work W having the opening groove 1 receives a compressive force or a tensile force, but since the core material 35 is inserted into the opening groove 1, the flanges 25 and 27 of the work piece W have the opening groove 1 formed therein.
Deformation of the cross-sectional shape caused by falling to the side is prevented. At this time, since the core material 35 is conveyed in synchronization with the work W, it does not slide with respect to the work W. Therefore, the core material 35 causes scratches on the inner surface of the opening groove 1 or burrs. Will not occur. As a result, the inner surface of the opening groove 1 can be kept smooth,
Sliding of the seat belt accommodated here becomes smooth. Further, the work W has a small curvature R shown in FIG.
_When bending into the portions W ₂ and W ₄ having ₂ , R ₄ , the core material 35 follows the bending as the slit 107 is closed like the portion A of FIG. 13, and bending can be performed easily. . In addition, as shown in FIG. 17, during bending in the up-down direction, a force is applied in the B direction from the support roller 41 side on the opening groove 1 side and a compressive force acts on the core material 35.
Counters this and prevents the core material 35 from being deformed.

As bending work is performed while the rooke W is being sent out,
The core material 35 is taken up by the take-up roller 91 of the core material removing mechanism 49. During bending, the work W moves up and down or left and right, but the rotation member 103 moves the support pin 101.
Since the take-up roller 91 can follow the movement of the work W, the core material 35 does not come off from the take-up roller 91.

The tension and slack of the core material 35 caused by the vertical and horizontal movement of the work W due to the bending process are absorbed because the core material 35 is constantly applied with a constant force by the tension roller 51. It is possible to stably convey the core material 35.

FIG. 19 shows the slit 10 only in the range corresponding to the portions W ₂ and W ₄ having small curvatures R ₂ and R ₄ as shown in FIG. 22 in the bending of the work W with respect to the core material 143.
7, the strength of the core material 35 is improved as compared with the case where the slit 107 is provided over the entire length.

FIG. 20 is a perspective view of the core material 145 when there is a portion that bends the work W in the left-right direction with a small curvature.
A slit 147 is formed over the entire length or at a portion corresponding to a portion having a small curvature. FIG. 21 shows a state in which the core material 145 is inserted into the opening groove 1 of the work W. In this case, the right side in the drawing is the center side of the bending R, and by performing the bending process in this way, the slit 147 is closed and follows the bending, and the bending process can be performed easily.

Further, in the case where there are bent portions with a small curvature in both the bent portions in the up-down direction and the left-right direction, the slits 10 of FIGS.
7 and the slit 147 of FIG. 20 may be formed in combination.

The core material does not have to be an endless belt, and in this case, one of the two tension rollers is for winding,
Make the same amount of core material as the amount of the other wound.

Further, without using the core material conveying device 37, the core material 143 has substantially the same length as the work W as shown in FIG. 21, and a small curvature R ₂ as shown in FIG. 22 when the work W is bent. , R ₄ having slits 107 formed only in a range corresponding to the portions W ₂ and W ₄ and the core material 143 is previously inserted into the opening groove.
It is also possible to remove the core material 143 after feeding from the core and performing bending processing. In this case, the slit 10 is provided over the entire length.
The durability of the core material 143 is improved as compared with the case where 7 is provided. Further, when the horizontal shape of the core material 143 that acts at this time is made to match the shape of the opening groove 1 of the work W, the work W
The effect of preventing the deformation of the shape is further improved.

EFFECTS OF THE INVENTION As described above, according to the present invention, since bending is performed with the core material being inserted in the opening groove of the work, the cross-sectional shape of the work does not change, and Since the core material is moved in synchronization with the work, the core material does not slide with respect to the work, and therefore the inner surface of the opening groove can be kept smooth.

[Brief description of drawings]

FIG. 1 is a side sectional view of a bending apparatus showing an embodiment of the present invention, FIG. 2 is a top view of FIG. 1, and FIG. 3 is II of FIG.
FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG.
5 is an enlarged side view of the core material inserting mechanism of FIG. 1, FIG. 6 is a front view of the guide roller of FIG. 5, FIG. 7 is a side view of the pressing member of FIG. 5, and FIG. Is a front view of the pressing member, FIG. 9 is a side view of the guide member of FIG. 5, FIG. 10 is a top view of FIG. 9, and FIG. 11 is an enlarged side view of the core material removing mechanism of FIG. FIG. 12, FIG. 12 is an enlarged front view of the core material removing mechanism, FIG. 13 is an overall view of the core material, FIG. 14 is a partial perspective view of the core material of FIG. 14 in an enlarged scale, and FIG. FIG. 16 is an enlarged detailed view of the core material, FIG. 16 is a sectional view taken along line XVI-XVI of FIG. 15, FIG. 17 is an explanatory view of the operation when the work is bent up and down, and FIG. Sectional drawing which shows the inserted state, FIG. 19 is explanatory drawing which shows the other example of a core material,
FIG. 20 is a perspective view showing still another example of the core material, FIG. 21 is a sectional view showing a state in which the core material of FIG. 20 is inserted into the opening groove of the work W, and FIG. 22 is a sheet after the work processing. FIG. 23 is a side view of the belt guide, FIG. 23 is a view taken along the line XXIII in FIG. 22, and FIG. 24 is an enlarged sectional view taken along line XXIV-XXIV of FIG.
FIG. 25 is a side sectional view of a conventional bending apparatus. W ... Work 1 ... Opening groove 29 ... Sending device 31 ... Bending device 33 ... Supporting device 35 ... Core material 37 ... Core material conveying device 143,145 ... Core material

Claims (1)

[Claims] 1. A core material made of a flexible material is fed in a longitudinal direction of an elongated work having an opening groove having a substantially constant cross-sectional shape along the longitudinal direction by a feeding device and is fed into the opening groove of the fed work. This core material is moved in synchronism with the movement of the work piece in a state where the work piece is inserted, and the work piece that moves integrally with the work piece is supported by a support device having a bending support point while A method for bending a long work, wherein bending work is performed by a bending device having a bending action point on the front side, and the core material is separated from the opening groove of the work after work.