JPH0824939A - Continuous wire drawing machine - Google Patents

Abstract

PURPOSE:To provide a continuous wire drawing machine capable of following the change in the die schedule during the operation even with the machine of the tension control type. CONSTITUTION:A differential reduction mechanism 6 between a motor 4 and a capstan C 2 consists of internal gears 12, 13 and external gears 11, 16 which are concentrically arranged, a friction wheel is provided on the internal gear 12 subject to the torque generated on the capstan C2 due to the tension of the wire W to provide the constant rotational moment to the capstan C2 by the preset friction force of this friction wheel, and the tension is controlled by the block even when the drawing resistance is fluctuated due to the wear of the die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straight type continuous wire drawing machine for continuously drawing a wire rod while applying reverse tension to the wire rod by a plurality of dies and a capstan arranged between them. is there.

[0002]

2. Description of the Related Art In the ordinary wire drawing method, a force in one direction is applied to the wire material to overcome the resistance passing through the die and the wire material is pulled out. The wire is pulled out while applying a force in the direction opposite to the direction of movement of the wire, that is, a backward tension. In other words, this wire drawing machine using reverse tension grips both ends of the wire, applies tensile stress to near the elastic limit, and then moves this with respect to the die and pulls it out, and pulling resistance applied to the die. It is based on the principle that is much smaller than in the normal case, the strain inside the material is improved and the deformation becomes straight, and the contact pressure acting between the die and the material is It is known to have many advantages over conventional wire drawing machines, such as lowering.

Further, in the case of continuously drawing the wire by utilizing this reverse tension, there is an advantage that a part of the drawing force can be used as it is as the reverse tension of the wire rod which enters the next die. This continuous wire drawing machine utilizing reverse tension is achieved by at least a plurality of dies, a capstan for transmitting a drawing force between the dies, and a winding drum provided in front of the last die. However, in the reverse tension wire drawing machine,
In addition to the mechanism that transmits a force sufficient to overcome the pulling resistance to the wire rod that has passed through the die, the pulling force and the reverse tension strength automatically maintain a constant relationship even if the drawing schedule changes due to die wear. It is necessary to have a mechanism for dripping and to be able to arbitrarily adjust the reference value of the reverse tension according to the diameter of the wire to be pulled out.

Conventionally, there are a tension control system and a speed control system as means for keeping the strength of the pulling force and the reverse tension constant. The tension control method is a method in which the strength of the tension of the wire rod is adjusted, and the wire speed is not particularly adjusted depending on the characteristics of the motor that drives the capstan.
On the other hand, the speed control method is a method in which the linear speed of each part of the continuous wire drawing machine is controlled so as to match the reference value, and the tension is not specifically considered or is given by another method.

As an example of the tension control system, a motor for independently driving each capstan is provided for each block,
Each block motor transmits a constant rotational moment to the capstan, transfers a part of the force necessary for pulling through the previous die to this capstan, and the remaining force acts on the line entering the next die. I try to make up for it with tension. As a means for transmitting this constant rotational moment to the capstan, at start-up, the field of the block motor is individually adjusted according to the wire drawing schedule to roughly compensate for the difference in the linear velocity between the capstans and the line speed. The tension is adjusted and the motor speed is not controlled during wire drawing.

Therefore, although it is difficult to use for a fine wire having a low breaking tension, it is a simpler mechanism than the speed control method in that a mechanism for detecting the linear velocity is not required. Since there is no intervening caps between the capstans, the overall mechanism can be made compact, and since the wire rod is not hung on the dancer roll, straight type wire drawing arranged in series without considering twisting of the wire rod. It has many advantages such as being machine-friendly.

On the other hand, as an example of the speed control system, a dancer roll is provided between the dies, and the dancer roll is supported by a spring member so that the slack of the line is removed and the tension applied to the line by the weight of the spring member or the dancer roll is applied. It becomes the reverse tension of the line that enters the next die, and it adopts a form that electrically detects the position change of this dancer roll and controls the speed of the block motor of the previous capstan. This speed control method complicates the control in that multiple blocks must be controlled uniformly, but the working condition is that the linear speed can be kept constant even if constant reverse tension is applied and the drawing schedule changes. Has the advantage that it can be used for drawing thin wires.

[0008]

As described above, the tension control system has many advantages such as being easy to apply to the straight type wire drawing machine, but on the other hand, the tension control of the block motor is performed at the time of threading the wire drawing setup wire. After that, the speed of the motor was not controlled during wire drawing, and the change in the tension of the wire was dealt with by the characteristics of the motor.Therefore, when using a block motor that can obtain a large output in accordance with the drawing of a thick wire. However, it is difficult to follow the change in the pulling resistance when pulling out the medium thin wire or the thin wire, and the medium thin wire or the thin wire may be cut. Therefore, the tension control method has a drawback that it can be used only for drawing a thick wire with a large breaking tension, and the appearance of a mechanism that can use a tension control method of a simple mechanism also for drawing a medium to thin wire is desired. I am here.

On the other hand, the speed control system, as described above, detects the displacement of the dancer roll during wire drawing to control the speed of the motor, so that it has the advantage that it can be used for fine wires with low breaking tension. Since the dancer roll is interposed between the capstans, it is difficult to apply it to the straight type wire drawing machine, and the wire threading work becomes complicated.Furthermore, since the wire rod is pulled out while making contact with the dancer roll, the wire rod is covered. There is a problem that the existing lubricant wears out and the lubrication performance deteriorates.

In order to solve this problem, without using a dancer roll, of the speed reducing mechanism interposed between the block motor and the capstan, by detecting the displacement of the torque arm partially connected to the gear, A method of detecting a change in linear velocity and adjusting the speed of a block motor is also known. However, in this method, since the block motor is installed integrally with the gearbox of the reduction mechanism, there is an advantage that the motor installation space is unnecessary, but the load on the driving shaft side of the reduction mechanism becomes too large, and the reduction mechanism It is expected that an unbalanced load will be applied to the motor, it will be difficult to install the motor, and that it will not be able to follow small changes in the linear velocity on the capstan side.

Therefore, the main object of the present invention is to provide a continuous wire drawing machine which can follow changes in the die schedule during operation even in the tension control system and can be used for medium and thin wires, and It is an object of the present invention to provide a continuous wire drawing machine applicable to a straight wire drawing machine by a simple and compact mechanism that does not use a dancer roll even in the speed control system.

[0012]

In order to achieve the above object, the inventor of the present application abolished a dancer roll as a common mechanism of a tension control system and a speed control system, and instead, a partial gear of a differential reduction mechanism. We focused on utilizing the rotation moment of. In other words, even if a normal speed reduction mechanism is used between the block motor and the capstan shaft, changes in tension of the wire rod and output torque of the motor cannot be released to the outside by this speed reduction mechanism, but a differential speed reduction mechanism is used. Then, the output torque of the motor can be rotated with different rotational moments due to the difference between the resistance value of the wire rod applied to the capstan shaft and the resistance value of the gear partially received from the outside.

Therefore, it can be released to the outside by the partial gear that receives the change in the tension of the wire and the output torque of the motor, and the tension control or the speed control can be performed based on the rotation moment or the rotation angle transmitted to this partial gear. It was found that speed and tension can be controlled by a compact and simple mechanism that does not use dancer rolls.

That is, in the tension-controlled continuous wire drawing machine according to the present invention, a differential reduction mechanism is provided between each block motor and the capstan, and a friction wheel is provided in a part of gears of the differential reduction mechanism. By providing this friction wheel with a predetermined friction force, a part of the driving force of the block motor is transmitted to the capstan shaft.
That is, if a predetermined frictional resistance is given to some gears of the differential reduction mechanism, a constant rotational moment is applied to the capstan due to the balance with the resistance from the wire rod applied to the capstan. Therefore, if the output torque of the block motor is set to a desired value, even if the drawing resistance fluctuates due to wear of the die during subsequent wire drawing, the difference due to the balance with the set friction force that counteracts this Some gears of the dynamic reduction mechanism rotate, and the rotation moment of the capstan shaft becomes constant.

Therefore, even when a high torque block motor is used, the desired rotational moment is transmitted to the capstan shaft by simply adjusting the set pressure of the friction wheel to a value according to the wire diameter of the wire or the breaking tension. be able to. That is, since a constant rotational moment can be transmitted to the capstan shaft regardless of the output torque of the block motor and the tension change of the wire rod can be dealt with, the present invention can be applied to the drawing work of medium-thin wire or thin wire.

As means for applying a predetermined frictional force to some gears of the differential reduction mechanism, a friction pad for pressing the gears may be pressed by a spring, magnet or fluid pressure, but the set pressure can be freely changed. Considering the points, it is most desirable to apply the frictional force by utilizing the fluid pressure, especially the air pressure.

As for the predetermined frictional force, the dynamic friction torque causes less rapid fluctuations in the rotational moment of the capstan shaft than the static friction torque, so it is preferable to rotate the internal gear in the dynamic friction state. . Therefore, as one embodiment of this tension control system, the friction wheel is rotated against a predetermined frictional force even during wire drawing.

On the other hand, in the speed control type continuous wire drawing machine according to the present invention, the same function as that of the dancer roll is applied to the torque arm attached to a part of the gears of the differential reduction mechanism. Since the change in reverse tension appears as the rotation of the torque arm through some gears, this rotation angle is detected by the angle detection sensor, and the speed of the block motor is controlled based on the signal from this angle detection sensor. Is controlled to be constant. In this case, a spring member, in particular, an air spring capable of arbitrarily setting the spring pressure can be said to be the most suitable embodiment as a means for externally applying resistance to some gears of the differential reduction mechanism.

As the differential reduction mechanism, a planetary gear may be used. However, since the planetary gear must be interposed between the sun gear and the internal gear,
There is a problem that the reduction mechanism itself becomes large in size, and it is considered desirable to configure it by combining an eccentric external gear and an internal gear that are arranged substantially coaxially with the input shaft and the capstan shaft. Therefore, in the present invention, an internal gear and an eccentric external gear arranged substantially coaxially with the input shaft and the capstan shaft are used, and the internal gear has a friction control system according to a tension control system or a speed control system. Or, by installing a torque arm, the arrangement interval of the capstans can be narrowed in the wire drawing direction by a series of arrangements arranged in the axial direction of the capstan shaft, and the differential reduction mechanism and the tension or speed control mechanism itself can also be used. By making it compact and installing each block motor in the wire drawing machine main body,
The present invention provides a continuous wire drawing machine that avoids installing a motor on a movable part.

[0020]

In the above tension control system, each block motor is driven at a rotation speed determined in advance according to the wire drawing schedule, but the friction wheel is pressed at the time of startup so that a predetermined reverse tension can be obtained. The air pressure etc. that determine the friction force of the friction pad are set. During wire drawing,
Since the capstan receives pullout resistance of the wire from the die, the capstan shaft needs a rotation moment to overcome this pullout resistance.

Power transmission to the capstan shaft is transmitted from the output shaft of the motor through the differential reduction mechanism, but the torque transmitted from the motor is usually set to be larger than the torque transmitted to the capstan shaft. By configuring the torque of the portion to be transmitted to the friction wheel, a constant torque is transmitted to the capstan shaft.

During wire drawing, if the drawing resistance of the wire changes due to wear of the die, the resistance value of the wire applied to the capstan shaft changes, and some gears of the differential reduction mechanism, especially internal gears. The relationship between the frictional resistance applied to the friction wheel and the resistance value of the toothed gear is different. For example,
When the pull-out resistance of the wire decreases, the motor output torque is distributed by the resistance value of the capstan shaft and the internal gear, so the rotation of the internal gear becomes slower due to the resistance value balance between the two, and the capstan shaft Rotation is faster,
By adjusting the rotation speed of the capstan, the wire rod is balanced with a predetermined tension applied. That is, the capstan is balanced in the state where a constant rotational moment is transmitted.

When this wire drawing machine is used for drawing a thick wire to a medium thin wire or a thin wire, the frictional force applied to the friction wheel is adjusted by the set air pressure or the like to adjust the transmission torque transmitted to the capstan. . The breaking tension of the thin wire is usually smaller than that of the thick wire, but the transmission torque transmitted to the capstan shaft can be lowered by lowering the set air pressure of the friction wheel.

Therefore, no matter how a high output block motor is used, its transmission torque can be set small by adjusting the set friction pressure to the friction wheel, and the transmission torque transmitted to the capstan can be set small. Since it is possible to instantaneously respond to the change in the tension as in the above, there is an advantage that it can be applied not only to the thick wire but also to the drawing work of the thin wire having a small breaking resistance.

On the other hand, in a speed control system using a differential speed reduction mechanism similar to the tension control system, in principle, the speed of the drawn wire rod is controlled to be constant, and the cross-section reduction rate The speed of each block motor is controlled so as to control the linear speed, that is, the speed of the capstan whose peripheral speed is almost the same as that of the capstan.

This control signal is obtained from the rotation angle signal of the torque arm. That is, the torque arm is attached to some gears of the differential reduction mechanism instead of the conventional dancer roll, the torque arm is stopped by the resistance force of the spring member, etc., and the next force is applied from the capstan by the spring force. The tension of the wire rod entering the die, ie the value of the reverse tension, is determined. Therefore, in order to set the value of the reverse tension to the set value, when the spring pressure of the torque arm or the air spring is used, the set pressure is adjusted before drawing.

During wire drawing, when the area reduction rate of a certain die fluctuates and the drawing resistance changes, the tension balance of the wire breaks and the balance with the spring pressure of the torque arm connected to some gears of the differential speed reduction mechanism. The torque arm that had stopped due to the balance between the spring pressure and the reverse tension of the wire rod rotates, and its rotation direction changes from the stopped state to either the right or left direction depending on the relationship between the pulling force and the reverse tension. But it changes. The rotation of the torque arm is detected by the angle detector, and the speed of each block motor is controlled based on the detected value. Then,
The output from each block motor is decelerated at a predetermined reduction ratio in the differential reduction mechanism, and then the capstan shaft is rotated. It is possible to control so that a constant reverse tension is applied while maintaining the harmony of the speed of the stun.

At this time, the motor is not directly attached to the speed reducing mechanism as in the prior art, but is a stationary type, so that an unbalanced load is not applied to the torque arm portion.
The transmission of the driving force in the differential reduction mechanism can be performed smoothly and accurately.

[0029]

Embodiments Embodiments shown in the accompanying drawings will be described below. FIG. 1 is a diagram showing the principle of a straight type continuous wire drawing machine according to the present invention, and FIG. 2 is a perspective view showing the wire drawing principle in a certain block. To show the wire drawing principle, a gearbox of a differential reduction mechanism is shown. The disassembled perspective view which removed is shown. 1 and 2 are common to both the tension control method and the speed control method. Therefore, first, the components common to the tension control system and the speed control system will be described with reference to FIGS. 1 and 2, and the unique components used for each control system will be described later.

As shown in FIGS. 1 and 2, a continuous wire drawing machine 1 according to the present invention includes a plurality of dies 2, 3 and capstans C1, C2, C3 which are respectively arranged between them and driven by respective block motors 4. And a driving device 5 for each capstan. In FIG. 2, the die 3, the capstan C2, and the driving device 5 constitute one block.

The drive unit 5 includes a block motor 4 installed in the body of the wire drawing machine, the motor and a capstan C2.
And a differential speed reduction mechanism 6 disposed between and. The block motor 4 is driven by a rotational moment calculated in consideration of the surface reduction rate of each die, and can be applied to both AC and DC types.

In the differential reduction mechanism 6, the driving force of the motor 4 is transmitted to the input shaft 8 via the motor pulley 7a, the belt 7b and the transmission pulley 7c, and an eccentric shaft 9 fixed to the input shaft 8 is provided. A transmission cylinder 10 rotatably supported by the eccentric shaft 9, a first external gear 11 formed on one outer wall of the transmission cylinder 10, and a first internal gear meshing with the external gear 11. 12, a second internal gear 13 formed on the inner wall of the other end of the transmission cylinder 10, and a second external gear 16 fixed to the capstan shaft 15 so as to mesh with the internal gear 13. I have it. The input shaft 8 and the capstan shaft 15 are coaxially arranged, and the first internal gear 12 is rotatably supported by the gear box 20 (see FIGS. 3 and 4). The first external gear 11 is eccentrically attached to the input shaft 8 by the eccentric shaft 9, and is configured to mesh with the internal gear 12.

Therefore, although the internal gear 12 can be fixed and used as a mere speed reducer, if the internal gear 12 is rotatable, the rotating elements are the input shaft 8, the capstan shaft 15, and the internal gear. It can also be used as a differential gear consisting of three elements 12, and when used as a differential gear, rotation from the input shaft 8 causes the capstan shaft 15 and the internal gear 12 to rotate.
Will be transferred to the rotation of. Therefore, various differential actions are possible depending on the values of the resistance applied to the capstan shaft 15 and the resistance applied to the internal gear 12.

The above is the basic configuration of the present invention, and it is possible to provide a tension control type or speed control type wire drawing machine utilizing the differential reduction mechanism 6. That is, in the tension control method, as shown by the solid line in FIG.
When the internal gear 12 is pressed by the friction pad 17 with a predetermined pressing force, a constant rotation moment is generated in the capstan C2, and the wire drawing is performed with a predetermined tension even if the drawing resistance of the wire changes. can do.

On the other hand, in the speed control method, the rotation angle of the internal gear 12 that rotates due to the difference in spring resistance of the spring member due to the tension fluctuation of the wire is detected instead of the conventional dancer roll, as indicated by the chain double-dashed line in FIG. By providing an angle detection sensor 18 for controlling the rotation speed of the motor 4 on the basis of a signal from this sensor, the rotation speed of the capstan, that is, the linear speed is made constant. Specific configurations of the tension control method and the speed control method are shown in FIGS. 3 to 5.

FIG. 3 is a sectional view of the differential reduction mechanism 6 applicable to the tension control system. An embodiment of the tension control system will be described with reference to FIGS. 3 and 1 and 2. The internal gear 12 is fixed to a cover 21 rotatably supported by a gear box 20 by bolts, and an external tooth type ring-shaped gear 22 fixed to the outer peripheral portion of the cover 21 by bolts.
A small gear 23 that meshes with the gear 22, a friction wheel 24 fixed to the shaft of the small gear, a friction pad 17 that presses the friction wheel, and a friction wheel 24 that presses the pad 17 at a set pressure.
And an air cylinder 26 that moves to the side. The set pressure of the air cylinder 26 can be set to a desired value, but this value is adjusted so that the capstan can obtain a desired rotation moment, and the main body of the air cylinder 26 is fixed to the gear box 20. .

The gear box 20 is fixed to the capstan support cylinder 27 by bolts, and the support cylinder 27 is fixed to the wire drawing machine main body 28. The eccentric shaft 9 is formed in a tubular shape and is fixed to the input shaft 8 by a key groove or the like so as to be integrally rotatable, and a transmission cylinder 10 is rotatably supported by a bearing on the eccentric shaft 9. Also, the capstan shaft 1
The cylindrical second external gear 16 fixed to 5 is rotatably fitted in the gear box 20 and rotatably supported by the inner end of the input shaft 8. This capstan shaft 1
A capstan C2 is fixed to the outer end portion of 5 by a bolt.

The number of teeth of the gears in this embodiment is 66 teeth for the first external gear 11 and 72 teeth for the first internal gear 12.
The second internal gear 13 has 66 teeth and the second external gear 16 has 6 teeth.
It is set to 0 teeth. Therefore, the reduction ratio of the first internal gear 12 in the stopped state is set to ⅕, but it depends on the rotation speed of the first internal gear 12, that is, the friction force of the friction wheel. The speed reduction ratio will change accordingly. The number of teeth of the gear train may be set so as to have another reduction ratio, and the number of reduction gear trains is not limited to this. The member indicated by reference numeral 29 in FIG. 3 is a bearing member of the input shaft 8.

A method of using the tension control type continuous wire drawing machine will be described. The wire W is passed through the first die, the tip of the wire W is entangled with the first capstan (for example, C1), and the first block motor is driven. At this time,
When the set pressure of the air cylinder 26 that regulates the rotation of the internal gear 12 is gradually increased, the rotational force of the motor 4 is gradually transmitted to the capstan shaft 15, and when the pull resistance is overcome, the capstan becomes gentle. Begins to rotate to.

When the wire rod is fully wound on the capstan C1, the set pressure of the air cylinder 26 is slightly returned to the original value and the rotation of the capstan is barely stopped.
The tip of the wire W is passed through a second die (for example, the die 3) and wound around the capstan C2, the second block motor 4 is driven, and the set pressure of the air cylinder 26 is adjusted to adjust the capstan shaft 15 When the torque transmitted to the wire rod is increased, a certain stage is reached and the winding of the wire rod starts. In this state, a weak reverse tension acts on the wire W entering the second die 3. When the wire W accumulates in the second block,
The set pressure of the air cylinder 26 of the second block is slightly reduced to reduce the pressure of the third block (for example, the die 2 and the capstan C).
Perform the same operation as 3).

In this way, with the wire rod W wound around all the blocks, the reverse tension is adjusted to the predetermined operating condition, and the speed of the final block motor (winding motor) is increased to draw all the blocks. The speed is increased all at once and the wire drawing state is entered. Therefore, the wire drawing speed is determined by the final rotation speed of the winding motor.

In the drawing process in this state, the rotation of the motor 4 is transmitted to the capstan shaft 15 so that the capstan C2 is rotated at a predetermined rotation moment corresponding to the difference between the drawing resistance from the die 3 and the reverse tension. To be done. When the drawing resistance of the wire changes due to wear of the die 3 during the wire drawing, the capstan C of the block is changed.
The rotational moment of 2 corresponds to the internal gear 12 of the differential reduction mechanism 6.
Since the frictional force applied to the wire rod W determines the pulling resistance of the wire W, the rotation speed of the capstan C2 increases, and if the predetermined rotation moment is balanced, the wire rod W continues to rotate at that rotation speed.

On the other hand, in the next block, when the reverse tension of the wire before entering the die 2 becomes small, the drawing resistance of the die 2 becomes large. Therefore, since the rotational moment of the capstan C3 is determined by the frictional force of the internal gear 12 of the differential reduction mechanism 6, the rotational speed of the capstan becomes slower as the pull-out resistance becomes larger, and the capstan C3 settles down with a predetermined wire tension. become. In this way, the tension control of a predetermined wire rod does not require speed control of a motor or the like, and a change in pullout resistance of the wire rod due to wear of a die or the like can be instantly corrected.

Further, since a part of the driving force of the motor is released to the friction wheel side, even if the driving torque of the motor is large, the capstan can be used only by changing the pressing force of the friction wheel. Since a predetermined rotation moment can be transmitted to the wire, it can be applied to various drawing processes regardless of the wire diameter.

Next, an embodiment of a speed control type continuous wire drawing machine will be described. FIG. 4 is a cross-sectional view of the differential reduction mechanism 6 applicable to the speed control system, and FIG. 5 is a configuration diagram of a torque arm portion of the reduction mechanism 6. A torque arm 30 is fixed to the outer peripheral portion of the gear cover 21 fixed to the internal gear 12, as shown in FIG. 5, and a cylinder type air spring 31 is connected to one end arm portion 30 a thereof via a connecting portion 38. Also,
The angle detection sensor 18 is provided on a part of the outer peripheral portion of the torque arm 30.
An external tooth portion 33 that meshes with the gear 32 is formed, and the angle of rotation of the torque arm 30 can be detected by the angle detection sensor 18. The angle detection sensor 18 has its main body fixed to the gear box 20, converts the rotation angle of the torque arm 30 into the rotation angle of the gear 32 and detects it as an electrical signal, and receives the output of this detection signal to obtain each signal. The speed of the motor 4 is controlled.

The air spring 31 has an air supply port 35 formed on the cylinder rod side thereof, and predetermined air is supplied to the air supply port 35 via a pressure reducing valve 36. The air pressure can be adjusted by the pressure reducing valve 36, and normally a constant linear velocity is obtained with the cylinder rod 37 extended to the intermediate position.

In the speed control type continuous wire drawing machine, the rotation of the motor 4 is reduced by a predetermined speed so that the capstan C2 can be rotated at a predetermined rotation moment corresponding to the difference between the pulling resistance from the die 3 and the reverse tension. Under the ratio, it is transmitted to the capstan shaft 15. The set pressure of the air spring 31 at this time acts in the direction of slowing the rotation of the capstan C2.

Now, when the tension of the wire changes due to a change in drawing resistance or the like due to wear of the die 3, the torque arm 30 of the differential reduction mechanism 6 which is stopped at the balance between the reverse tension of the wire and the set pressure of the air spring 31. Will rotate. The rotation angle of the torque arm 30 is transmitted to the gear 32 of the angle detection sensor 18 through the external tooth portion 33, and the torque arm 30
The signal corresponding to the rotation angle of is output to the motor 4 side. In response to this output, the speed of the motor 4 is controlled. Then, the change in the rotation speed of the motor 4 is transmitted to the capstan shaft 15 with a predetermined reduction ratio, and the capstan C2
Speed control is performed while maintaining a constant linear velocity before and after. These linear velocity controls are performed for each block.

As described above, the linear velocity control is performed in the same manner as in the conventional dancer roll, and instead of the dancer roll, a part of the differential reduction mechanism 6 has a torque arm 30 and an air spring 31 having the same function as a dancer roll. Since it is installed almost coaxially with the speed reduction mechanism 6, since the dancer roll is abolished, the continuous wire drawing machine can be made compact, and the wire passing work is facilitated. However, since it is not pulled out, deterioration of lubrication performance can be prevented. In addition, block motor 4
Is installed in the body of the wire drawing machine and is not arranged in the speed reduction mechanism as in the conventional case, so that the motor load does not affect the wire drawing control.

The angle detecting sensor in the above embodiment may employ a method of detecting an angle by an optical sensor or the like. In this case, a configuration is adopted in which light is emitted from the light emitting unit to a large number of detection holes or reflection portions formed at equal intervals on the side surface of the internal gear, and the rotation angle of the internal gear is detected by the transmitted or reflected light. can do.

Further, in the above embodiment, the continuous wire drawing machine in which the tension control method and the speed control method are separately incorporated has been described, but it is also possible to adopt a method in which both are incorporated in the same wire drawing machine. In this case, since the speed control method is a method capable of instantaneously stabilizing the linear velocity, it is preferable that the speed control method is arranged on the final block side and the tension control method for keeping the tension constant is arranged on the initial block side. . By doing so, it is possible to provide a wire drawing machine that employs a tension control method not only for medium thin wires but also for drawing thin wires.

[0052]

As is clear from the above description,
According to the continuous wire drawing machine of the present invention, in the tension control method, a differential reduction mechanism is used as a reduction gear that transmits the driving force from the motor to the capstan, and the set friction force of some rotatable gears is used. Since a differential action is performed by the balance between the wire tension and the tension of the wire rod, a constant rotational moment can be applied to the capstan, and pull-out resistance of the pull-out resistance can be increased without controlling each block motor during wire drawing. The tension can be corrected instantly in response to the change. Therefore, it can be expected that the present invention can be applied to the extraction of medium-thin wires or thin wires even if a high-output motor is used. Further, since the set friction force can be controlled for each block by changing the set pressure of the air cylinder, there is an effect that the control becomes simple.

Further, since the set frictional force is performed by the dynamic frictional force, it is possible to prevent abrupt fluctuations even in the correction of the fluctuations in the tension of the wire rod, and it is possible to provide a drawn wire rod of a constant high quality.

On the other hand, in the speed control system according to the present invention, the torque arm corresponding to the conventional dancer roll is arranged coaxially with the differential reduction mechanism, and the torque is balanced by the balance between the spring pressure of the torque arm and the tension of the wire. Since the arm is stopped, the linear velocity can be kept constant by controlling the motor by the rotation angle of the torque arm even if the reverse tension changes during wire drawing, so the same speed control as the conventional one is possible. In addition, it is possible to expect an excellent effect that it is possible to provide a compact wire drawing machine that does not use a dancer roll and can be easily threaded, has excellent lubricating performance, and is compact.

Further, in any wire drawing machine of any control method, each control is performed by a compact differential reduction mechanism in which an internal gear and an eccentric external gear are arranged substantially coaxially with an input shaft and a capstan shaft. The block motor can be achieved, and since the block motor is installed on the main body, there is an advantage that the influence on the wire drawing control by the unbalanced load is eliminated.

[Brief description of drawings]

FIG. 1 is a view showing the principle of a straight type continuous wire drawing machine according to the present invention.

FIG. 2 is a perspective view showing a wire drawing principle in a block.

FIG. 3 is a sectional view showing a differential reduction mechanism in an embodiment of a tension control type wire drawing machine.

FIG. 4 is a sectional view showing a differential reduction mechanism in an embodiment of a speed control type wire drawing machine.

FIG. 5 is a configuration diagram of a torque arm section of the same.

[Explanation of symbols]

 C1, C2, C3 Capstan W Wire material 1 Continuous wire drawing machine 2, 3 Dies 4 Motor 5 Drive device 6 Differential reduction mechanism 8 Input shaft 9 Eccentric shaft 10 Transmission cylinder 11 External gear 12 Internal gear 13 Internal gear 15 Capstan shaft 24 Friction car

Claims (4)

[Claims] 1. A continuous wire drawing in which a wire rod is pulled out from the die and continuously drawn while a reverse tension is applied to the wire rod by a plurality of dies and a capstan arranged between these dies and driven by a block motor. In the machine, a differential reduction mechanism is provided between each block motor and the capstan,
A tension control type continuous wire drawing machine in which a friction wheel is provided on a part of the gears of the differential reduction mechanism and the driving force of the block motor is transmitted to the capstan shaft by pressing the friction wheel with a predetermined friction force. . 2. The continuous wire drawing machine according to claim 1, wherein the friction wheel rotates against a predetermined frictional force even during wire drawing. 3. A continuous wire drawing in which a wire rod is pulled out from the die and continuously drawn while a reverse tension is applied to the wire rod by a plurality of dies and a capstan arranged between these dies and driven by a block motor. In the machine, a differential reduction mechanism is provided between each block motor and the capstan,
A torque arm for generating reverse tension in the wire is provided on a part of the gears of the differential reduction mechanism, an angle detection sensor for detecting the rotation angle of the torque arm is provided, and a block is provided based on a signal from the angle detection sensor. A speed control type continuous wire drawing machine designed to control the speed of a motor. 4. A differential reduction mechanism is provided with an internal gear and an eccentric external gear arranged coaxially with an input shaft and a capstan shaft, and the friction wheel or torque arm is attached to the internal gear, and a block motor is provided. The continuous wire drawing machine according to claim 1, 2 or 3, wherein the wire drawing machine is installed in the body of the wire drawing machine.