JPH0716711B2 - Axial straightening device for long workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to an axial bending straightening device for an elongated work, which straightens an axially bent long work to a desired bending reference angle.

(Prior Art) An example in which a long linear work is subjected to an axial bending process is, for example, a seat belt guide of a passive seat belt for an automobile. Passive seat belts are those that automatically actuate the seat belt at the same time that the occupant sits on the seat and closes the door to keep the occupant restrained. In this case, one end of the seat belt is inside the seat (on the console box side). The other end is fixed to the cable side that slides in the front-rear direction along the seat belt guide attached to the periphery of the window frame of the door. The seat belt guide is a long aluminum alloy extruded material, and has a concave opening groove formed along the longitudinal direction.

When bending a linear metal material (long work) as described above with a bending machine, it is difficult to obtain a uniform product due to variations in the bending angle. If it is necessary to attach the device by bending it, the variation in the bending angle may make the attachment difficult.

For this reason, conventionally, the axial bending corrector shown in the top view of FIG. 11 is used to correct the bending angle of the work W as shown in FIG. 12 to a desired bending reference angle. The work W set in this straightening device is preliminarily axially bent by a bending machine, but the shaft end E ₁ , which is to be bent at a predetermined angle with respect to the linear intermediate portion S of the work W, E ₂ is allowed to be corrected in the same direction relative to unnecessarily bent and, from this state, all were bent workpiece by the desired bending reference angular position.
For example, with respect to the shaft end E ₁ , if the desired bending reference angle is θ, bending is performed up to the angle α beyond the reference angle θ.

Such an axis straightening device shown in FIG. 11 for the work W is configured such that the clamp 1 for fixing the intermediate portion S of the work W and the side portions of the left and right shaft end portions E ₁ , E ₂ of the work W are brought into contact with each other. The straightening part 3 which moves toward the desired bending reference angle side is provided. The straightening unit 3 is horizontally moved along the guide rail 9 by the ball screw 7 connected to the drive motor 5. Then, this correction operation is performed several times toward the correction target value that is the bending reference angle according to a predetermined comparison value, such as the angles β and γ shown in FIG. 12, to obtain the desired bending reference angle. Get the angle.

(Problems to be Solved by the Invention) By the way, the seat belt guide formed by axially bending a long work needs to be attached in conformity with a curved vehicle body shape of an automobile, and particularly in a vertical direction or an oblique direction with respect to the vehicle body. Shaft end E ₁ , which is the part to be aligned with the directional position,
Regarding E ₂ , it must be bent three-dimensionally and curved like the work W shown in FIGS. 6 and 7, and it must be bent relative to the axis for attachment to the vehicle body. In some cases, twisting is applied. In the work W shown in FIGS. 6 and 7, the shaft ends E ₁ and E ₂ are twisted.

6 and 7 which have been subjected to such three-dimensional bending
When the work W shown in the drawing is straightened by using the conventional axial bending straightening device, the straightening portion 3 moves in a horizontal direction parallel to the intermediate portion S which is not curved. Therefore, as shown in FIG. 9 showing the details of the shaft end portion E ₁ of FIG. 8 that schematically shows the shape of FIG. 7, the desired bending reference angular position B cannot be reached from the position A before straightening. It will be corrected to the position C horizontally moved to the right in the figure. For this reason, even if the work W is corrected, a seat belt guide having a desired shape that matches the curved surface shape of the vehicle body cannot be obtained, resulting in deterioration in quality.

Therefore, the present invention provides a desired axial line bending shape even when a long work piece is bent in a predetermined direction with respect to the axis line and curvedly bent in a direction deviating from the bending locus surface of the work piece during the bending process. The purpose is to be able to correct it.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention is such that the shaft end side is bent in a predetermined direction with respect to a linear axis, and
The shaft end side is curvedly bent in a direction deviating from a bending locus surface during the bending process, and a long work piece bent in a state in which the bending angle in the predetermined direction deviates from a desired bending reference angle is used as the bending reference. In an axial bending straightening device for a long workpiece for straightening and bending toward an angle side, a fixing portion for fixing a linear axis portion of the long workpiece on a predetermined surface, and an axial end side of the long workpiece is A straightening portion that is pressed and moved toward the bending reference angle side, guides the movement of the straightening portion, and a straight line that connects the work shaft end before straightening and the work shaft end at the desired bending reference angle with respect to the predetermined surface. And a guide portion that is inclined by an angle formed by bending.

(Operation) With the axial part of the long work fixed by the fixing part,
When the straightening portion moves along the guide portion, the axis end portion of the long work is fixed to the straight line connecting the work shaft end before straightening and the work shaft end at the desired bending reference angular position. It is corrected in the direction of the angle formed with respect to the predetermined surface, so that the elongated work can have a desired bending shape.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

This axial work straightening device for straightening a long work corrects the axial bending of a work W shown in FIGS. 6 and 7 which is a seat belt guide made of an aluminum alloy of a passive seat belt for automobiles as in the conventional example. . Therefore, this work W also has a shaft end portion in accordance with the vehicle body shape.
The E _1, E _2, three-dimensionally by the bending machine (not shown), yet curved to bend giving the process, are also performed further torsion to the axis machining. In this bending process, as shown by the solid line in FIG. 6, extra bending is performed with respect to the desired bending reference angular position shown by the chain double-dashed line.

As shown in FIG. 1, the axial work straightening device for a long work has a clamp 11 as a fixing part for nipping and fixing an intermediate part S, which is a linear axis part of the work W, according to its center mark O. The clamp 11 is operated by a hydraulic or pneumatic drive cylinder 13. The opening groove of the work W fixed to the clamp 11 is on the upper side in FIG. The shaft end extending to the left and right with respect to the intermediate part S is corrected by the correction part as in the conventional example, but only the left shaft end E ₂ will be described here.

As shown in FIG. 2 which is a view taken in the direction of arrow II of FIG. A movable member 19 having a substantially L-shape that can be adjusted according to the twist angle with respect to the axis is provided. The lower parts of the support tool 17 and the movable tool 19 are connected by a connecting tool 21, and the movable tool 19 is rotatable via a pin 23. On the other hand, the upper side is connected to each other by an angle adjusting adjuster 25. The angle adjustment adjuster 25 has a long hole on the movable tool 19 side.
25a is formed, and a slidable pin 27 for the long hole 25a is attached to the movable member 19 through the long hole 25a. Further, the movable tool 19 is provided with a position detection sensor for the workpiece W, which includes a light emitting element 29 and a light receiving element 31 for detecting that the work W has come into contact with the side surface 19a of the movable tool 19.

The support 17 of the correction unit 15 has a bottom 17a rotatably supported by a support shaft 33 via a bearing 35. The support shaft 33 is second with respect to the tip side of the correction arm 39 by the spline 37.
As shown in Figs.
39 is rotatable around a central shaft 41 near the clamp 11. A roller 45, which is rotatable via a pin 43, is attached to the lower end side surface of the support shaft 33. The roller 45 is a long hole of the guide member 47 installed on an arc curve centered on the central axis 41.
It can roll along 47a. The long hole 47a is provided with respect to the intermediate portion S in the horizontal state where the work W is set in the straightening device, that is, the horizontal plane, and the work shaft end A shown in FIG. 10 before straightening.
And an angle p formed by a straight line connecting the work shaft end B at a desired bending reference angle.

The rotation of the correction arm 39 is performed by a drive motor 49 such as servo, pulse or stepping. A ball screw 51 is connected to the drive motor 49.
Guide rails 53, 55 are provided on both sides of.
The ball screw 51 and the guide rails 53 and 55 are provided on the straightening arm 39.
The holder 57 attached to the lower surface of the
Moves along the guide rails 53 and 55. The holder 57 is
It moves along the guide rails 53 and 55, and the straightening arm 3
Since it is necessary to move with the rotation of 9, the correction arm 3
It is rotatable with respect to 9 via a shaft 59.

Drive motor 49 to work W on the side of guide rail 55
An origin detection sensor 61 that detects the origin position before the correction unit 15 contacts the workpiece W is provided on the side, and the drive motor 49 side of the origin detection sensor 61 and the drive motor.
On the other side of the workpiece W with respect to 49, an overrun prevention sensor
63 and 65 are provided respectively. Each of these sensors 61,6
3, 65 detect the position of the correction unit 15 by detecting the non-detection dog 67 provided on the side of the holder 57.

A pulse generator 69 for checking the amount of movement of the straightening unit 15 is installed beside the shaft end E ₂ of the long work W. The pulse generator 69 is a rotating body via a wire 71 whose end is connected to a metal fitting 70 on the side of the holder 57.
The amount of movement of the correction unit 15 is detected by the rotation of 73.

Based on the detection values of the position detection sensor including the light emitting element 29 and the light receiving element 31, the origin detection sensor 61, and the pulse generator 69, a control circuit configured by, for example, a microcomputer (not shown) aims to correct the bending reference angle side. The correction operation according to the predetermined comparison value for the value is repeated several times.

Next, the operation of the axial work straightening device for a long work configured as described above will be described. The clamp 11 clamps and fixes the intermediate portion S of the long work W, and the drive motor 49 is operated in this state to bring the correction unit 15 close to the work W and move the movable tool 19
Side surface 19a of the workpiece W is brought into contact with the opening groove side of the work W. At this time, the position detection sensor including the light emitting element 29 and the light receiving element 31 detects the work W, the position is stored, the correction unit 15 returns to the origin position, and the pulse generator 69 checks the work W again. The work W is moved by a fixed amount to press and correct the work W. This correction operation is performed several times to correct to the desired bending reference angle position.

At the time of the above-mentioned movement of the correction portion 15, the roller 45 at the lower end of the support shaft 33 rolls along the long hole 47a of the guide member 47, and along with this, the support shaft 3
3 slides downward with respect to the straightening arm 39, and the straightening portion 15 also descends along with the shaft end portion E ₂ side of the work W. At this time the correction department
As shown in FIG. 10, the work W pressed and straightened should move in a straight line connecting the work shaft end position A before straightening and the work shaft end position B at the desired bending reference angle. Therefore, the work W has a desired bending angle and curved surface shape.

Above it has been described axial end portion E ₂ side of the straightening unit 15 of the workpiece W, also shaft ends E ₁ side shown in FIG. 9, the axial end portion E ₂
Axial bending can be corrected by a mechanism similar to that on the side.

In addition, as shown in FIGS. 9 and 10 corresponding to the arrow view from the VII direction in FIG. 6, particularly, as shown in FIG. 9, the curved surfaces of the shaft end portions E ₁ and E ₂ before and after the correction. It seems that the shape has changed, but in reality, this curved surface shape does not change before and after correction.

FIG. 5 shows another embodiment of the present invention. In this embodiment, the ball screw 51 connected to the drive motor 49 in the above embodiment is tilted to the same degree as the tilt angle p of the elongated hole 47a of the guide member 47, and this is used as a guide portion for the correction portion 75. Is. In this case, the straightening portion 75 includes a cam follower 79 having a thrust bearing 77 and set bolts 81, 83.
It is attached to the correction arm 39 by fixing with.

In this embodiment as well, the straightening portion 75 has the inclination angle of the ball screw 51, that is, the intermediate portion S in the horizontal state where the workpiece W is set in the straightening device, with respect to the workpiece shaft end position A before straightening and the desired bending reference. Since the workpiece W moves along the angle formed by the straight line connecting the workpiece shaft end position B, the workpiece W has a desired bending angle and curved surface shape as in the above-described embodiment.

In the above-mentioned straightening device, the bending machine was used to perform straightening on those bent excessively from the bending reference angle.However, even if bending was done to a bending angle smaller than the bending reference angle, the bending was performed from the opposite side of the work. The same can be corrected by pressing the correction portion.

[Effects of the Invention] As described above, according to the present invention, the shaft end side is bent in a predetermined direction with respect to the axis, and the shaft end side deviates from the bending locus surface of the workpiece during the bending process. The shaft end side of the long work, which is bent in a curved line and further bent so that the bending angle in the predetermined direction is deviated from the desired bending reference angle, is the work shaft end before straightening and the work at the desired bending reference angle. Since the straight line connecting the shaft end is corrected in the angle direction formed with respect to the predetermined surface on which the shaft portion is fixed, a desired bent shape and curved surface shape can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of an axial line straightening device for a long work piece showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG.
FIGS. 4 and 5 are explanatory views of the operation of the main part of FIG. 2 in an enlarged manner, and FIG. 5 is an explanatory view of the main part of an axial bending straightening device for long workpieces corresponding to FIG. 3 showing another embodiment. , FIG. 6 is a plan view of a long work piece, FIG. 7 is a view on arrow VII of FIG. 6, FIG. 8 is a schematic view of FIG. 7, and FIGS. 9 and 10 are shaft ends of FIG. Part E ₁
And Fig. 11 is an explanatory view of a straightening operation between a conventional example and an embodiment of the present invention in E _2, Fig. 11 is a top view of an axial bending straightening device for a long work showing a conventional example, and Fig. 12 is a straightening device using the conventional device. It is an explanatory view of a work in the case. 11 ... clamp (fixing portion), 15 ... correcting section 47 ... guide member, 47a ... elongated hole (guide portion) W ... workpiece, S ... intermediate portion E _1, E ₂ ... shaft end portion

Claims (1)

[Claims] 1. A shaft end side is bent in a predetermined direction with respect to a straight axis line, and the shaft end side is curved in a direction deviating from a bending locus surface during the bending process, and further bent in the predetermined direction. A long work that has been bent in a state in which the angle is deviated from a desired bending reference angle, in an axial work straightening device for a long work that performs straightening bending toward the bending reference angle side, in a linear shape of the long work. A fixing part that fixes the axis part on a predetermined surface, a straightening part that pushes the shaft end side of the long work toward the bending reference angle side, and a work axis before straightening that guides the movement of the straightening part. An axial line straightening device for a long workpiece, comprising: a guide portion in which a straight line connecting an end and a work shaft end at the desired bending reference angle is inclined by an angle formed with respect to the predetermined surface.