JP2005169484A - Steel wire, its manufacturing method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel wire having superior linearity with little variance, and also to provide a method and an apparatus for simply manufacturing the steel wire. <P>SOLUTION: A steel wire for which drawing is finished is passed through straightening rolls for which grooved rolls each rotatable around the axis are arranged across the pass line. Simultaneously, the straightening rolls are rotated around the pass line as the center axis, thereby giving spirality to the wire, and dispersing a surface residual stress on the cross-sectional circumference, so that straightness by the spiral interference is contrived. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wire having excellent straightness and a method and apparatus for manufacturing the same.

Steel wires are used as they are or as steel wire products such as saw wires and electric discharge machining wires, and rubber reinforcing members represented by steel cords and hose wires.
Such a steel wire is generally made by drawing a raw steel wire to an intermediate diameter and wet-drawing it. However, the steel wire as such a material is then twisted, spiraled or paralleled, for example. The products are arranged as a product, but it is desired to be as straight as possible from the usage status of the product.
As for the straightness, for example, it is desirable that the height of an arc when a wire having a length of 400 mm is placed on a plane is 50 mm or less.

As a countermeasure for this, conventionally, the wire drawing angle and the drawing angle including the final drawing die or several upstream dies are adjusted at the time of manufacturing the wire.
In addition, correction is performed by passing the wire through a fixed position correction roll in which rolls are arranged in a staggered pattern on the winding line.

  However, in all of these prior arts, there has been a problem that the bending of the wire is not sufficiently eliminated, the straightness level is bad, and the variation is large.

The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a steel wire having excellent linearity and less variation, and a method and apparatus capable of easily producing the steel wire.
A second object of the present invention is to provide a method and apparatus for manufacturing a steel wire that has excellent linearity, little variation, and stable rotation.

  In order to achieve the above-described object, the manufacturing method of the present invention is to pass the steel wire that has been drawn through straightening rolls each having a grooved roll that can rotate around its axis, with each pass line interposed therebetween. By rotating the straightening roll around the pass line as a central axis, a spiral wrinkle is formed on the wire, the surface residual stress is dispersed on the cross-sectional circumference, and linearization is achieved by interference of the spiral shape. (Claim 1)

In the apparatus of the present invention, the take-up means and the grooved rolls each capable of rotating around the axis line are positioned on the steel wire pass line with the pass line interposed therebetween, and the whole rotates around the pass line. In this order, a straightening roll that can be freely rotated, an over twister that can rotate around the pass line, and a plurality of grooved rolls that can rotate around the axis, with each pass line sandwiched between them. It is characterized by having arranged in. (Claim 2)
In this apparatus and the method described above, the grooved rolls are arranged at an interval that avoids P ′ / 2 in relation to the twist pitch P ′. (Claim 3)

  The straightening roll is fixed in a cylindrical rotor having a wire insertion hole in the center and a cylindrical rotor having one end driven and rotated at its end, a bearing that rotatably supports the shaft, and One side roll base, the other side roll base with adjustable distance to it, a grooved roll supported on one side roll base for rotation about its own axis, and the other side roll base can rotate about its own axis It comprises the grooved roll supported by this. (Claim 4)

  The steel wire of the present invention is a wire having a diameter of 1.0 mm or less and an arc height of 400 mm and 50 mm or less, which has been straightened by the method or apparatus. (Claim 5)

  According to the first aspect of the present invention, it is possible to obtain an excellent effect that a steel wire having excellent linearity and less variation can be produced continuously and easily.

According to the second aspect of the present invention, it is possible to obtain an excellent effect that a steel wire having excellent linearity and less variation can be continuously and easily produced by a simple structure and arrangement.
According to the third aspect, it is possible to obtain an excellent effect that a spiral wrinkle can be effectively attached to the wire.
According to the fourth aspect, it is possible to obtain an excellent effect that the straightening process can be performed with a simple structure.
According to claim 5, it is possible to provide a wire that is suitable for a steel reinforcing product represented by a steel wire product such as a saw wire and an electric discharge machined wire, a steel cord and a hose wire, and has excellent linearity and less variation. can get.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 7 show an example of a steel wire manufacturing method and apparatus according to the present invention. FIG. 8 schematically shows the straightening process state.
In FIG. 1, reference numeral 1 denotes a wet wire drawing machine, in which two capstans 10 a and 10 b are arranged in a tank 1 a filled with a lubricant, a required number of dies 10 c are arranged on a moving path between them, and an outlet A final die (finishing die) 10d is arranged at the site.

W ′ is an elemental steel wire introduced into the wet wire drawing machine 1, and includes those in which the raw wire is roughly drawn and heat-treated, as well as those having a plated layer such as brass or zinc on the surface after the heat treatment. Yes. The raw steel wire W ′ is guided to the wet wire drawing machine 1 and drawn and drawn sequentially by passing through the die 10c, and finished to a target diameter of 1.0 mm or less with a light area reduction rate by the final die 10d. The tensile strength Y (Kgf / mm ² = −175 D + 280) is a steel wire W having a characteristic of 280 or more. D is a wire diameter (mm).

  Reference numeral 2 denotes take-up means disposed downstream of the final die 10d of the wet wire drawing machine 1 and is composed of a drive capstan 2a having a large diameter and a follower capstan 2b having a relatively small diameter. By being wound around the drive capstan 2a and the driven capstan 2b several times, the wet cap wire 1 is moved and drawn at a predetermined linear velocity. As shown in FIG. 3 (a), the steel wire W exiting the wet wire drawing machine 1 has a large-diameter coil with an arch-shaped bent rod that extends outside (pull side) and shrinks inside (compression side). It will be in the state which showed the state. The same applies to the stage after the take-up means 2.

  Reference numeral 3 denotes a straightening roll (rotation leveling means) arranged downstream of the take-up means 2, which is a major feature of the present invention. This straightening roll 3 is a means for correcting the bending wrinkles of the steel wire W exiting the wet wire drawing machine 1, that is, a three-dimensional spiral wrinkle or indentation (hereinafter referred to as wrinkles) intentionally on the surface of the wire. The surface residual stress is dispersed on the circumference of the cross section so that the compression stress side and the tensile stress side are alternately formed by the interference of the spiral shape.

  The straightening roll 3 is composed of three or more grooved rolls 30 and 31 as a whole, and each of the straightening rolls 3 can rotate around an axis. In this example, the grooved rolls 30 and 31 are arranged symmetrically across the pass line so as to have a staggered shape. In addition, all the grooved rolls 30 and 31 are integrally rotatable about the pass line as a central axis.

4 is an over twister, and the three-dimensional spiral straightening wire W1 that has passed through the straightening roll 3 has a rotational property (= residual torsion). Therefore, it is used to adjust the rotational property by adding over twisting. Is done.
The over twist 4 includes a pair of rolls 4a and 4b, and is rotatable around a pass line as a central axis.

Reference numeral 5 denotes a fixed leveling roll for correcting a small wave remaining on the three-dimensional helical straightening wire W2 after the rotation adjustment, and each of the three or more grooved rolls 50, each of which can rotate around an axis, 51 is arranged with the pass line in between, but the entire position is fixed without rotating around the pass line.
The number of the grooved rolls of the fixed leveling roll 5 is for the purpose of correcting the small wave generated by the straightening roll. Usually, the upper 3 pieces + the lower 2 pieces or more.
Reference numeral 6 denotes a take-up spooler for taking up the trimmed steel wire WS.

The drive system of each part is arbitrary, but for example, as shown in FIG.
A drive motor 7 rotates the capstan 10b by a first transmission means 70 such as a belt and a pulley. The first transmission means 70 is also a second transmission means such as a belt and a pulley. 71 is in communication with the drive capstan 2 a of the take-up means 2. Further, the straightening roll 3 and the over twister 4 are rotated by the third transmission means 72 including the speed reducer 720.

The straightening roll 3 characterized by the present invention is different from the one in which the wire is formed into a three-dimensional spiral shape like the three-pin type preformer in the tubular type twisted wire machine. Dimensional correction means.
In other words, the preformer in the tubular type twisting machine is a means for processing the wire into a three-dimensional spiral shape, and as shown in FIG. From the relationship of forming into a spiral shape, as shown in FIG. 10A, the three pins and the roll 8 are approximately 1 / twice of the twist pitch P (the value obtained by dividing the take-up speed by the number of rotations of the twisting machine). It is essential to be arranged at every two positions. For this reason, when the wire originally has a bent wrinkle, since it is shaped by squeezing substantially the same portion on the cross section of the wire, linearization cannot be obtained even if it passes through the preformer, and FIG. As shown in the figure, it becomes a spiral shape with curved bends.

  In the present invention, unlike the above, a plurality of spiral wrinkles are dispersed in each part of the cross section of the wire, and then the bent wrinkles are formed by eliminating the tensile stress and the compressive stress by the interference between the spiral wrinkles. A straight wire is obtained that is dimensionally corrected and has a helical shape with a pitch close to the twisting pitch. Even if the straightening roll alone is used for correction without such straightening rolls, stable good linearity cannot be realized.

  The straightening roll 3 will be described in detail. As shown in FIG. 4 to FIG. 7 as an example, the straightening roll 3 is installed as a unit in the zone including the pass line together with the over twister 4. In this example, it is stored in a fixed booth 9 with an open / close door.

The straightening roll 3 has a cylindrical rotor 3a. The rotor 3a has shafts 3b and 3b 'at both ends, and the shafts 3b and 3b' are bearing plates 3d and 3d fixed to the booth 9. It is supported rotatably through a bearing. The shafts 3b and 3b 'have a through-hole through which the wire is led in and out, and a half part is inserted into the rotor.
A pulley 3c is fixed to one shaft 3b, and a belt 721 constituting the third transmission system is suspended around the pulley 3c, whereby the rotor 3a is rotated around the pass line as a central axis. It has become so.

The rotor 3a has a supporting wall plate 3e fixed therein, and horizontally long upper and lower roll bases 3f and 3g are fixed to the supporting wall plate. Three or more (five in the drawing) rotatable rolls 30 are attached to the upper roll base 3f at a predetermined interval.
Further, three or more (four in the drawing) rotatable rolls 31 are attached to the lower roll base 3g at a predetermined interval, and the upper roll 30 and the lower roll 31 are arranged in a staggered manner as a whole. .

Each of the rolls 30 and 31 has a V-shaped groove on the outer periphery, ball bearings 300 and 310 on the inner diameter side, and is planted with bolts 33 or the like on the roll bases 3f and 3g.
The upper roll base 3f is applied to the support wall plate 3e, and is fixed to the support wall plate 3e by bolts 34 attached near both ends. The lower roll base 3g has horizontal protrusions 35, 35 at both ends, and a pair of left and right vertically elongated holes 36 are formed through the plate thickness on the inner side, and bolts 34 are formed in the vertically elongated holes 36. The lower roll base 3g can be adjusted in the vertical direction with respect to the branch wall plate 3e.
A projecting piece that faces the horizontal projecting part is fixed to the support wall plate 3e, and the push rod 36 is projected through this to move the lower roll base 3g up and down, and the axis between the lower roll 30 and the upper roll 31 is fixed. The distance, that is, the wire pushing amount can be adjusted.

As described above, the straightening roll 3 of the present invention disperses the spiral wrinkles dispersed in each part of the cross section of the wire, cancels the tensile stress and the compressive stress by the interference of the helical wrinkles, and turns the bent wrinkles. This is a three-dimensional correction.
For this reason, when an interval similar to that of the preformer is adopted as the interval between the rolls (approximately 1/2 of the twist pitch P), wrinkles are concentrated on substantially the same portion of the cross section. Therefore, it is not possible, and in relation to the twist pitch P ′ (the value obtained by dividing the take-up speed by the number of rotations of the straightening roll), P ≠ 2. For example, when the take-up speed is 250 m and the rotational speed of the straightening roll is 5000 rpm, the twist pitch P ′ is 50 mm. If the roll interval is set to P ′ / 2 = 25 mm, it is not possible because wrinkles are concentrated at substantially the same location in the cross section.

In the present invention, as the straightening rolls (upper roll 30 and lower roll 31) rotate without rotating the wire, the number of the rolls is spiraled between the twist pitches P ′. Therefore, if the interval between the rolls is equal to or larger than the roll diameter and deviated from P ′ / 2 as described above, spiral wrinkles are dispersed and attached to the cross section of the wire. The bending is corrected by the interference of the state.
The roll interval is a small interval or a large interval according to the above conditions, but from the point that spiral wrinkles are applied all around the wire cross section, and the straightening roll becomes larger as the interval increases, the interval between the rolls is small. It is desirable to do. However, around P ′ / 4 is not very preferable because it is brazed from two directions.

  Note that the smaller the twist pitch, the longer the brazing length per unit length, and the greater the straightening effect. In order to reduce the twisting pitch, the rotational speed of the straightening roll 3 is increased or the take-up speed is decreased. However, since the latter decreases the productivity, the noise, vibration and bearing life are taken into consideration. Thus, it is preferable to set the rotational speed of the straightening roll 3 to a high value such as 4000 to 7000 rpm.

  The over twister 4 has a pair of rolls 4a and 4b each having a groove formed on the outer periphery thereof, which is rotatably supported on an arm 4c. A rotating shaft 4d integrated with the arm is attached to a bearing plate 4e fixed to the booth. It is rotatably supported. A pulley 40 is fixed to the shaft end of the rotating shaft 4d, and a belt 722 constituting the third transmission system is suspended around the pulley 40, whereby the pair of rolls 4a and 4b have their pass lines as the central axes. It is designed to be rotated around.

  The fixed leveling roll 6 has basically the same structure as the straightening roll 3, but the supporting wall plate is fixed to the base and does not rotate.

In addition, what is illustrated is an example of the present invention, and various other configurations may be employed.
1) The total number of grooved rolls in the straightening rolls is at least 3 (upper 2 + lower 1) as a whole. Preferably, there are 4 on one side and 3 or more on the other side, but there is no limitation as long as it is more. In addition, the grooved rolls may be arranged such that a pair of rolls are arranged in an axial symmetry with respect to the wire without being shifted in phase from top to bottom.
2) Although directly connected to the wire drawing machine in the embodiment, it may be wound around a bobbin once after wire drawing as shown in FIG.
3) In the embodiment, the straightened wire is wound around the bobbin. However, after the fixed leveling roll 6, a desired processing means such as a pre-former may be disposed and continuously processed.

  The wire manufacturing method according to the present invention will be described. The wire W 'is drawn by a large number of dies 10c of the wet wire drawing machine 1 and passes through the final die 10d. The wire drawing is controlled in speed by being wound around the drive capstan 2a and the driven capstan 2b of the take-up means 2 arranged on the pass line several times.

  The wire W that has passed through the take-up means 2 is subsequently introduced into the straightening roll 3. In this straightening roll 3, a plurality of upper rolls 30 capable of rotating and a plurality of lower rolls 31 capable of rotating are arranged at intervals deviated from P ′ / 2 in relation to the twist pitch P ′ described above. As shown in FIG. 8A, the wires W pass while contacting the grooves of the upper roll 30 and the lower roll, respectively. At this time, since the cylindrical rotor 3a incorporating the upper roll 30 and the lower roll 31 has a driving force introduced into the shaft 3b at the end via a belt and a pulley, the upper roll 30 and the lower roll 31 are The pass line is rotated at a predetermined rotational speed around the center axis.

  For this reason, the wire W is wrinkled by the number of the upper rolls 30 and the lower rolls 31 on substantially the entire circumference of the cross section, and the wrinkles are excessive when each roll rotates around its own axis in accordance with the movement of the wire. In addition, since the upper roll 30 and the lower roll 31 are arranged at intervals deviating from the twist pitch P ′ / 2, as shown in FIG. , C, D, E, a, b, c, d are attached from each direction, and the ridge draws a spiral in the axial direction of the wire as shown by the stripes in FIG. . As a result, the surface residual stress does not concentrate on one place of the cross section of the wire but is distributed on the circumference. For this reason, the bending wrinkle that the wire had so far is corrected by the mutual interference action of a plurality of helical wrinkles.

  Subsequently, the wire W1 is led to the over twister 4 and is led out by an eight-shaped path wound around one of the pair of rolls 4a and 4b across the pass line, wound around the other and returned to the pass line. The rolls 4a and 4b are twisted by being rotated in the direction opposite to the rotation direction of the straightening roll with the pass line as the central axis.

  The wire W1 that has passed through the straightening roll 3 has a rotational property (twist) in accordance with the processing here, and since residual stress is included inside, the rotational property is generated when the stress is released as it is. By applying torsion in the opposite direction to the straightening roll 3 to the wire by the over twister 4, the residual stress is removed and the rotational property is adjusted to substantially zero.

  The wire W <b> 2 whose rotational property is adjusted in this way is then introduced into the fixed leveling roll 6. Each of the fixed leveling rolls 6 is capable of rotating around an axis, and a plurality of upper rolls 50 and lower rolls 51 are arranged in a zigzag pattern across the pass line, but without revolving around the pass line. The position is fixed. Therefore, the wire is pressed from the 180-degree symmetrical position by passing between the upper roll 50 and the lower roll 51, and the small wave left by the straightening roll 3 is corrected. As a result, the wire WS is straight and has its rotational property adjusted, and is wound around the winding spooler 6.

Wires were produced by the method and apparatus of the present invention.
The wire uses a high carbon steel wire with a carbon content of 0.82% and a diameter of 5.5 mm. The wire is roughly drawn and quenched to a diameter of 1.22 mm, brass-plated, and a wet continuous wire drawing machine with a diameter of 0. Finished to 42 mm.
The apparatus shown in FIG. 1 was used. As the straightening rolls, nine bearing rolls with a V-groove having a roll diameter of 16 mm were arranged at intervals of 8.5 mm (5 pieces on the upper side and 4 pieces on the lower side). The center-to-center distance between the upper rolls and the lower rolls is 17 mm.

The over twister used a pair of 65 mm diameter rolls. As the fixed leveling roll, 12 V-groove bearing rolls having a diameter of 14 mm were arranged on the upper side and 11 on the lower side.
The wire led out from the final die of the wet continuous wire drawing machine was taken up by the take-up means, passed through a straightening roll, an over twister, and a fixed leveling roll and wound up. The rotation speed of the straightening roll is 5000 rpm (once per wire speed / 50 mm = twisting pitch) and clockwise with respect to the wire traveling direction, and the over twister is 900 rpm rotating counterclockwise with respect to the wire traveling direction ( Reverse rotation).

The obtained wire had a tensile strength of 290 kgf / mm ² . The straightness was measured according to JISG3510, the wire was cut to 400 m, the sample was placed on a flat surface, and the height of the arc (arc height) was measured. As a result, the average of 10 samples was 10 mm, and good linearity was obtained.
This is a cross section of 0 °, 122.4 °, 244.8 °, 7.2 °, 129.6 °, 252 °, 14.4 °, 136.8 °, 259.2 ° on straightening rolls. It is clear that the correction effect is due to the spiral brazing being performed approximately uniformly from three directions with a shift of about 7.2 °.
Further, the rotation was measured according to JISG3510. The end of the wire was bent in an L shape and pulled out 6 m from the bobbin, and then the fixed end was opened and the number of rotations was counted. As a result of this measurement, the clockwise direction and the counterclockwise direction were both zero.

  As a straightening roll, seven V-groove bearing rolls with a diameter of 19 mm are arranged at intervals of 10 mm (four on the upper side and three on the lower side), and the other conditions are the same as in Example 1. The linearity of was obtained. In this case, the cross-sections were shifted from the direction of 0 °, 144 °, 288 °, 72 °, 216 °, 0 °, and 144 ° by about 72 °, and the wrinkles were substantially evenly provided from five directions.

  Furthermore, as a straightening roll, nine V-groove bearing rolls with a diameter of 16 mm are arranged at an interval of 11.11 mm (5 pieces on the upper side and 4 pieces on the lower side), and the other conditions are the same as in the first embodiment. Also, approximately the same linearity was obtained. In this case, the brazing was performed approximately evenly from nine directions with a shift of about 40 °. The same result was confirmed for the 22.22 mm interval.

It is a side view which shows the outline of the steel wire manufacturing method and apparatus by this invention. It is a top view which shows the outline | summary of the steel wire manufacturing method and apparatus by this invention. (A) is a side view which shows the state of the wire upstream of a straightening roll, (b) is a side view of the wire obtained by this invention. It is a perspective view which shows the unit of the straightening roll and over twister in this invention. It is a partial notch side view of the straightening roll in this invention. It is sectional drawing which follows the VI-VI line of FIG. It is sectional drawing which follows the VII-VII line of FIG. (A) is a side view schematically showing the treatment state with a straightening roll, (b) is a cross-sectional view showing the action position of the roll with respect to the wire, and (c) is a schematic diagram showing the residual stress of the wire passing through the straightening roll. FIG. It is a side view which shows the other embodiment of this invention. (A) is explanatory drawing which shows the pin arrangement | positioning and processing state in a preformer, (b) is sectional drawing which shows the action | operation point of the pin at that time, (c) is after a preformer when a wire has a bending flaw It is a side view which shows the state.

Explanation of symbols

2 Take-up means 3 Straightening roll 3a Rotor 3b Shaft 3f Upper roll base 3g Lower roll base 30 Upper roll 31 Lower roll 4 Over twister 5 Fixed leveling roll

Claims (5)

By rotating the straightening roll around the pass line while passing the steel wire that has been drawn through a straightening roll that has a grooved roll that can rotate around the axis, with the passline in between. A method of manufacturing a steel wire, characterized in that a spiral wrinkle is attached to the wire, surface residual stress is dispersed on the circumference of the cross section, and linearization is achieved by interference of the spiral shape. On the steel wire pass line, a take-up means and a straightened roll, each of which has a grooved roll that can rotate around its axis, sandwiching the pass line, and the whole is rotatable around the pass line, and a pass It features an over twister that can rotate around the line and a fixed roll that is fixed in position in which a plurality of rolls with grooves that can rotate around the axis are arranged across the pass line. Steel wire manufacturing equipment. The steel wire manufacturing method or apparatus according to claim 1 or 2, wherein the grooved rolls are arranged at an interval avoiding P '/ 2 in relation to the twist pitch P'. The straightening roll has a cylindrical rotor having a wire insertion hole in the center and a shaft driven and rotated at one end, a bearing that rotatably supports the shaft, and one side fixed in the cylindrical rotor. The roll base and the other side roll base whose distance to this can be adjusted, the grooved roll supported to be rotatable about its own axis on one side roll base, and the other side roll base to be rotatable about its own axis The steel wire manufacturing apparatus according to claim 2, comprising a grooved roll. A steel wire having a diameter of 1.0 mm or less and a 400 mm length arc height of 50 mm or less, which has been straightened by the method or apparatus according to claim 1 or 2.

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