JP4900792B2 - Coiled wire straightening method and straightening device - Google Patents

Description

  The present invention relates to a straightening method and a straightening device for straightening a coiled wire rod, and more particularly to a straightening method using a plurality of straightening rollers and an improvement in linearity accuracy in the straightening device.

  In a forging machine that forges a workpiece to produce a part with a predetermined shape, a wire straightening device and a cutting device are attached to the preceding stage, and a long wire is cut into a predetermined length of workpiece and supplied in sequence. Is. Since wire rods such as steel wires are usually received in a coiled state, the straightening device has the role of straightening the wire rod with the curl into a substantially arc shape and supplying it to the cutting device. ing. In recent years, demands for improving the dimensional accuracy of parts have become severe, and as a precondition, improving the accuracy of linearity of wires and workpieces has become an important issue. In particular, when a highly accurate part is manufactured, a linear wire may be used. However, since the length of the wire is limited, the setup work becomes complicated, the yield of the wire is poor, and the cost increases. Therefore, there is a need for a straightening device that can straighten even a coiled wire with high accuracy.

  In this type of straightening device, a device using a plurality of straightening rollers is frequently used. For example, in the wire rod supply apparatus disclosed in Patent Document 1 by the applicant of the present application, two sets of a turntable (rotary table), a feed roller, and a correction roller group are arranged in parallel. The turntable is a part for placing a wire wound in a coil shape, and the feed roller is a part for feeding the wire. The correction roller group is a part that urges the drawn wire material alternately from the left and right side surfaces to straighten it. Two sets are arranged side by side in order to shorten setup time by using alternately.

  In addition, in order to hold | maintain a turntable, the stand disclosed by patent document 2, for example can be used. This stand is provided with a piston and a cylinder on the lower side of the turntable so as to be able to move up and down, so that the feeding height of the wire is kept substantially constant.

In order to improve the accuracy of linearity, an apparatus that uses two sets of straightening roller groups in series and sequentially applies urging force from the horizontal direction and the vertical direction has been put into practical use.
Japanese Utility Model Publication No. 6-29743 Japanese Patent Publication No. 2-14136

  By the way, according to the result of the straightening experiment using the conventional straightening roller group, it has been found that there is a limit to the straightness, ie, straightness, of the straightened wire. In other words, the straightness does not become zero and there is a limit even if the straightening plane of the wire is made to coincide with the straightening plane created by the straightening roller group and the mutual arrangement of the straightening rollers is changed. . Moreover, even if correction was performed from both the horizontal and vertical directions using two groups of correction rollers, the straightness was still limited. It has been found that the cause is that the substantially arc-shaped curl of the wire does not coincide with the correction plane and is corrected in a protruding state.

  The present invention has been made in view of the above background, and a straightening method that can improve the accuracy of linearity more than the conventional one when straightening a coiled wire using a plurality of straightening rollers. And a correction device.

  The method of correcting a coiled wire rod according to the present invention is a method of feeding or pulling out a coiled wire rod placed on a rotatable turntable, and correcting a plurality of freely rotating discs arranged in two rows. In a straightening method of a coiled wire rod that alternately biases the wire rod from both sides on the outer peripheral surface of the roller, the posture of the substantially arc portion of the wire rod that has been drawn or drawn out is approximately Control is performed sequentially so that a plane including the arc portion coincides with a correction plane formed by the plurality of correction rollers.

  In the straightening method of the present invention, a wire such as a steel wire or a copper wire is placed on a turntable in the form of a coil, and is sequentially drawn or pulled out from one end. Here, when the drive source is arranged between the turntable and the straightening roller and the wire is pushed into the straightening roller, it is described as “feeding out”, and the drive source is arranged between the straightening roller and the cutting device. In the case of a configuration in which the wire is drawn into the straightening roller, it is described as “drawing out”, and both are described as “supplying”. In either case, the supplied wire rod has a substantially arc-shaped curl resulting from the original coil shape. The plurality of straightening rollers are alternately arranged in two rows to form a straightening flattening plane, and are disc-shaped and freely rotatable. Accordingly, the supplied wire rod is urged in contact with the outer peripheral surface of the correction roller alternately on the left and right, and advances while meandering.

  At this time, the wire is not connected to a simple arc in the plane, but is supplied with a twist in the circumferential direction of the wire itself and three-dimensionally swelled, and the displacement angle formed by the curl and the correction plane gradually increases. It was the actual situation that changed. In the prior art, correction is performed in a state where the substantially arc-shaped curl of the wire does not coincide with the correction plane, so that sufficient straightness has not been obtained. In the present invention, the posture of the substantially arc portion of the wire is sequentially controlled so as to always coincide with the correction plane. The plane including the substantially arc portion referred to here is not a mathematically strict definition, but means that it can be regarded as an almost plane in terms of engineering. That is, although the wire is bent in three dimensions strictly, if attention is paid to a part to be corrected from now on, it can be regarded as an almost two-dimensional arc shape, and a plane including the arc can be grasped. . And it can be thought that the wire of the shape where such a substantially circular arc part continued was supplied sequentially.

  The posture of the wire is sequentially controlled so that the plane including the substantially arc portion coincides with the correction plane, that is, the wire is held in the correction plane. For example, control is performed to sequentially tilt the turntable or the correction roller while detecting the attitude of the wire rod with a sensor. This can be realized not only by making the turntable freely rotatable but also by allowing the rotation axis to swing. Alternatively, the base supporting the correction roller may be tilted.

  Furthermore, it is preferable that the wire drawing-out source or the drawing-out source be within the correction plane.

  It is preferable that the feeding source or the drawing source from which the wire is separated from the coil-shaped portion is stored in the correction plane, and can be realized, for example, by arranging the above-described feed roller corresponding to the drive source in the correction plane. Or you may make it provide a guide ring in a correction plane suitably, and let a wire pass.

  As described above, according to the method for correcting a coiled wire rod according to the present invention, substantially arc portions of the wire rod are alternately biased and corrected from both side surfaces while being held in the correction plane. At this time, the phenomenon that the wire rod does not protrude from the correction plane as in the conventional case does not occur, and the wire rod meanders in the correction plane. Therefore, the substantially arc portion of the wire is urged from the outside and inside of the arc, and is corrected with high linear accuracy.

Next, a correction apparatus for realizing the correction method of the present invention will be described. The coiled wire straightening device of the present invention is alternately arranged in two rows on the base, a rotatable turntable on which the coiled wire is placed, a wire supply means for feeding or drawing out the wire, and a base. In a coiled wire rod straightening device comprising a plurality of disk-shaped straightening rollers that are free to rotate and urge the wire rod alternately from both sides on the outer peripheral surface thereof, the rotating table or the base is tilted Tilting means;
Control means for sequentially controlling the tilting means so as to reduce a displacement angle formed by a plane including a substantially arc portion of the drawn-out or drawn-out wire and a correction plane formed by the plurality of correction rollers; It is characterized by providing.

  The turntable is a part on which a coiled wire rod is placed, and for example, the turntable can be configured so that a stand on which a drum around which a wire rod is wound is rotated. Or you may comprise so that the drum itself may be rotatably supported. The wire rod supply means is a portion that sequentially feeds the coiled wire rod to the correction roller by paying out or drawing it out. The wire supply means is disposed in front of or behind the correction roller, and for example, a pair of feed rollers or a set of transfer fingers can be applied. The feed roller presses the wire between a pair of disk-shaped members and supplies the wire by rotation. The transfer finger consists of a movable finger and a fixed finger. After the movable finger grips the wire and moves in the supply direction, the fixed finger holds and holds the wire, and the movable fin releases the wire and returns to the original position. The wire is supplied by the above operation. The plurality of straightening rollers are alternately arranged in two rows. For example, the straightening rollers can be arranged on the horizontal base so as to be alternately left and right while facing the wire. The correction roller is disk-shaped and can be freely rotated by pivoting the center, and can be formed so as to abut against and urge the wire on the outer peripheral surface.

  The tilting means is a part that tilts the rotating table or the base. For example, the tilting means for tilting the turntable can be configured by combining a mechanism portion that swings a bearing portion of a shaft that pivotally supports the turntable and a drive source. Further, as a tilting means for tilting the base, for example, a pivot support part that pivotably supports the base, and a gear part and a drive source provided at the lower part of the base may be provided. For example, a motor can be used as the drive source, and desired tilt control can be performed by forward rotation or reverse rotation. By tilting either one, the relative angle between the turntable and the base changes, so the relative angle between the wire on the turntable and the correction plane on the base changes.

  The control means is a part that sequentially controls the tilting means so as to reduce the displacement angle formed by the plane including the substantially arc portion of the wire and the correction plane. As the control means, for example, an electronic control device including a detection unit, a calculation unit, and an output unit can be used. In the detection unit of the electronic control device, for example, the displacement angle is detected by an optical sensor, the direction and angle of tilting are obtained by the calculation unit, and the drive source can be sequentially controlled by the output unit. By detecting the displacement angle and controlling the tilt by real-time feedback control, the displacement angle can be reduced, preferably zero.

  According to the correction device of the present invention described above, the rotation base or the base is tilted by the tilting means, and the displacement angle formed between the substantially arc portion of the wire and the correction plane can be reduced, preferably zero. Therefore, it is possible to execute the correction method of the present invention in which a plane including a substantially arc portion of the wire coincides with the correction plane.

  In the correction method of the present invention, the turntable or the correction roller is sequentially tilted so that the plane including the substantially circular arc portion of the supplied wire coincides with the correction plane. Therefore, the substantially circular arc portion is urged from the outside and the inner side of the arc. And corrected with high linear accuracy.

  Further, the correction apparatus of the present invention includes the tilting means and the control means, and can sequentially control the displacement angle to decrease, preferably zero, so that the correction method of the present invention can be executed.

  First, a conventional correction device will be described with reference to FIG. 1A and 1B are diagrams for explaining a main part of a conventional correction device, where FIG. 1A is a plan view and FIG. 1B is a front view. A conventional straightening device 6 includes a horizontal straightening unit 8 and a vertical straightening unit 7 on a common base 61, straightens a wire supplied from a turntable (not shown) in the right direction in the figure, and moves leftward. To supply.

  The horizontal correction unit 8 includes a horizontal base 81 disposed horizontally on the common base 61, and a horizontal sub-base 82 disposed on the same horizontal plane as the horizontal base 81 and having one end held by the horizontal base 81. It has. The other end side of the horizontal sub-base 82 is urged toward the horizontal base 81 by a strong spring member 83. Two correction rollers 85B and 85D are provided on the upper surface of the horizontal base 81, and three correction rollers 85A, 85C and 85E are provided on the upper surface of the horizontal sub-base 82 so as to freely rotate in a horizontal posture. Yes. A total of five correction rollers 85A to 85E are alternately arranged in two rows from the right side to the left side in the figure, and a correction path is formed at the center.

  The vertical straightening unit 7 is provided on the left side of the horizontal straightening unit 8. The vertical base 71 is disposed vertically on the common base 61. The vertical straightening unit 7 is disposed on the same vertical plane as the vertical base 71. And a vertical sub-base 72 held by 71. The other end side of the vertical sub base 72 is urged toward the vertical sub base 72 by a strong spring member 73. Two correction rollers 75A and 75C are provided on one side surface of the vertical base 81, and two correction rollers 75B and 75D are provided on the same side surface of the vertical sub-base 72 so as to freely rotate in a vertical posture. It has been. A total of four correction rollers 75 </ b> A to 75 </ b> D are alternately arranged in two rows from the right side to the left side in the drawing, and a correction path continuous from the horizontal correction unit 8 is formed at the center.

  In the straightening device 6 having the above-described configuration, the wire is guided to the straightening path from the right side in the figure, and first proceeds to the left side while sequentially abutting against the horizontal straightening rollers 85A to 85E, and then the straightening roller 75A in the vertical posture. Correctly applied by meandering slightly in contact with ~ 75D. As described above, even if correction is made from both the horizontal and vertical directions, straightness after correction is limited when coiled wire is used.

  Next, the best mode for carrying out the present invention will be described with reference to FIG. FIG. 2 is a diagram schematically illustrating a correction apparatus according to an embodiment of the present invention. The correction device 1 according to the embodiment includes a turntable (not shown), a feed roller 2, five correction rollers 31A to 31E, a marking means 41 and a marker detection means 42, a tilting means 5, and a control means (not shown). And is composed of.

  As the turntable, for example, a stand disclosed in Patent Document 2 can be used. By using this stand, even if the coiled wire M is consumed, the height of the feeding source can always be kept constant. The feed roller 2 is a portion corresponding to a wire rod supply means, and a pair of opposed disk-like members are disposed with a space substantially corresponding to the wire rod diameter. The feed roller 2 is rotated by a driving source (not shown) to pinch the wire M and feed it toward the correction rollers 31A to 31E.

  The five correction rollers 31 </ b> A to 31 </ b> E have a disk shape, are alternately arranged in two rows on the base 32, and their centers are pivotally supported to be freely rotatable. The correction rollers 31 </ b> A to 31 </ b> E are disposed on one plane slightly above the base 32, and this plane is a correction plane that serves as a reference. The central passage through which the wire M passes is a straightening path. As shown in FIG. 1, a groove is formed in the center of the outer peripheral surface of the correction rollers 31A to 31E so that the wire rod comes into contact with a stable height. Note that the number of correction rollers is not limited to five.

  The marking means 41 is a means that is fixed to the entrance side of the correction path, and applies a marker to the wire M passing therethrough from a certain direction (from the back side in the figure). For the marker, ink or the like can be used. A linear marker is provided on the outer peripheral surface of the wire M in the longitudinal direction. On the other hand, the marker detection means 42 is means fixed to the exit side of the correction path and detects the rotation angle of the marker of the wire M passing therethrough. The rotation angle is an amount corresponding to the twist angle of the wire M from the entrance to the exit of the correction path. When the detected rotation angle of the marker is zero, that is, when the wire M is passing through the correction path without being twisted in the circumferential direction, the substantially arc portion of the curl of the wire M is within the correction plane and the displacement angle Turns out to be zero. When a certain rotation angle is detected, the wire M passes while being twisted, and it is found that the substantially arc portion of the wire M and the correction plane have a displacement angle.

  The tilting means 5 is a part that tilts the base 32 and is composed of a set of pivotal support portions 51, 51, a driven gear 52, a drive gear 53, and a drive motor 54. The pivot portions 51 and 51 are portions that pivot so that the base 32 can be tilted to the right and left around the correction path, and are formed with a rolling bearing fixed to the base 59. The driven gear 52 is a semicircular gear fixed downward to the lower portion of the base 32. The drive gear 53 is a gear that meshes with the driven gear 52 and drives it. The drive motor 54 is provided inside the bottom of the base 59, and the drive gear 53 is provided on the output shaft thereof. Note that a worm may be applied to the drive gear 53, or a reduction mechanism may be added to convert to a desired drive torque and drive speed.

  The control means (not shown) is means for controlling the drive motor 54 in accordance with the detection result of the marker detection means 42. That is, based on the detected rotation angle of the wire M, the direction in which the base 32 is tilted and the displacement angle are calculated, and a control command is sent to the drive motor 54 for control. Since the wire M is drawn out one after another and the detected rotation angle changes sequentially, the control is performed sequentially in real time.

  If the wire rod M is straightened using the straightening device 1 of the embodiment described above, the displacement angle formed between the substantially circular arc portion of the wire rod M and the straightening plane can be reduced. Therefore, it is possible to execute the correction method of the present invention in which the plane including the substantially arc portion of the wire M coincides with the correction plane formed by the correction rollers 31A to 31E.

  There is a two-dimensional measurement method as another method for obtaining the displacement angle. In the two-dimensional measurement method, distance measuring means is provided on the entrance side of the straightening path, and the horizontal displacement and vertical displacement of the wire M from the straightening path are measured. Then, since the direction in which the substantially circular arc portion of the wire M is displaced is determined, the displacement angle can be obtained by calculation. In this method, since the wire M is measured in a state of being constrained at a plurality of points, the calculation result may be corrected in order to obtain a true displacement angle in an unconstrained state.

In the following description, the effects of the correction apparatus 1 of the embodiment will be described with reference to experimental results. FIG. 3 is a diagram for explaining a method of a straightening experiment performed using five straightening rollers 35A to 35E similar to those of the straightening device 1 of the embodiment. (A) shows the arrangement of the straightening rollers, and (B). Indicates the displacement angle, and (C) indicates the straightness. The wire M used in the experiment is a round bar having a diameter D = 6 mm of carbon steel for mechanical structure S45C. The two-row arrangement of the correction rollers 35A to 35E is as shown in FIG. 3A. The first, third, and fifth rollers 35A, 35C, and 35E are arranged in a straight line on one side of the correction path, and on the other side. Are arranged with second and fourth rollers 35B and 35D. Further, the second roller 35B is pushed by the pushing amount P2 = 3 mm into the straightening path through which the wire M passes, and the fourth roller 35D is changed in the pushing amount P4 = 0.4 to 0.9 mm. Then, the wire rod M is meandered by the push amounts P2 and P4. Further, the wire M has a coil diameter of 1000 mm and is provided with a substantially arc-shaped winding rod, and as shown in FIG. 3 (B), the displacement angle X is increased in five stages from 0 ° in (A) to 115 ° in (O). It is changing. That is, the experiment is repeated by changing the displacement angle X formed by the plane including the substantially arc portion and the correction plane by intentionally changing the direction in which the wire is fed out. And the straightening degree K as shown in the following formula and FIG.3 (C) is calculated | required with each wire M after correction | amendment, and the correction effect is evaluated.
Straightness K = 4 × Q / (L × L)
However, L is the reference length of the wire M, and Q is the maximum amount of distortion when the posture of the wire is changed up and down.

  The result of the correction experiment performed as described above is as shown in FIG. 4, and it was found that the correction effect was the greatest when the displacement angle X was 0 ° of (A). In FIG. 4, the horizontal axis indicates the pushing amount P4 of the fourth roller 35D, the vertical axis indicates the obtained straightness K, and five graphs indicate the case where the displacement angle X is changed as a parameter. As shown in the figure, when the displacement angle X is 0 ° of (A) and the push-in amount P4 = 0.5 mm, the straightness K becomes zero, and it has been found that the straight line is corrected to a substantially perfect straight line. On the other hand, when the displacement angle X is not 0 ° (i) to (e), the straightness K does not become zero even if the push amount P4 is changed, and the straightness decreases as the displacement angle X increases. It turned out that correction was difficult. Note that the negative sign of straightness K means that the substantially arc portion has been overcorrected to the opposite side because the push amount P4 is excessive.

  From the above experimental results, it has been found that reducing the displacement angle X, preferably zero, is essential for improving the correction performance. The correction method and correction apparatus of the present invention achieve this.

It is a figure explaining the principal part of the conventional correction apparatus, (A) is a top view, (B) has shown the front view. It is a figure which illustrates typically the correction apparatus of the Example of this invention. It is a figure explaining the method of the correction | amendment experiment performed using five correction rollers similar to the Example of FIG. 2, (A) is arrangement | positioning of a correction roller, (B) is a displacement angle, (C). Indicates straightness respectively. It is a graph which shows the result of the correction experiment performed in the way shown in FIG.

Explanation of symbols

1: Straightening device 2: Feed roller (wire supply means)
31A-31E, 35A-35E: Straightening roller
32: Base 41: Marking means 42: Marker detection means 5: Tilt means
51: Pivot 52: Driven gear 53: Drive gear 54: Drive motor 6: Conventional correction device
7: Vertical straightening part 8: Horizontal straightening part M: Wire rod D: Diameter of wire rod P2, P4: Pushing amount of straightening roller X: Displacement angle K: Straightness L: Reference length of wire rod Q: Maximum distortion amount of wire rod

Claims (3)

A coiled wire placed on a rotatable turntable is fed or pulled out, and the wire is removed from both sides by the outer peripheral surfaces of a plurality of freely rotating disk-shaped correction rollers arranged in two rows. In the method of correcting coiled wire rods that are alternately energized and straightened,
The posture of the substantially circular arc portion of the wire drawn or drawn out is sequentially controlled so that a plane including the substantially circular arc portion coincides with a correction plane formed by the plurality of correction rollers. Coiled wire straightening method.   The method for correcting a coiled wire according to claim 1, wherein a drawing source or a drawing source of the wire is within the correction plane. A rotatable turntable on which a coiled wire is placed, wire supply means for drawing out or drawing out the wire, and alternately arranged in two rows on the base, and freely rotatable and the wire on the outer peripheral surface thereof In a straightening device for a coiled wire, comprising a plurality of disc-shaped straightening rollers for alternately energizing from both side surfaces,
Tilting means for tilting the turntable or the base;
Control means for sequentially controlling the tilting means so as to reduce a displacement angle formed by a plane including a substantially arc portion of the drawn-out or drawn-out wire and a correction plane formed by the plurality of correction rollers; ,
An apparatus for correcting a coiled wire rod, comprising:

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