JP5876738B2 - Capstan for wet wire drawing machine and wet wire drawing machine using the same - Google Patents

Description

  The present invention relates to a capstan for a wet wire drawing machine (hereinafter also simply referred to as “capstan”) and a wet wire drawing machine using the capstan. The present invention relates to a capstan for a wet wire drawing machine that can suppress deterioration of wire quality and is easy to maintain, and a wet wire drawing machine using the capstan.

  In the conventional wet wire drawing machine, a steel wire (hereinafter also simply referred to as “wire”) is wound around a capstan to obtain a drawing force. As a result of pursuing economic efficiency, several tens of die wire drawing machines are used. Slip type wire drawing machines driven by two motors are the mainstream. The wet wire drawing machine has a structure in which a number of dies corresponding to the number of stages are arranged between a pair of multi-stage capstans, and usually one to several pairs of multi-stage capstans are provided in the wet wire drawing machine. .

  Each of these pairs of multi-stage capstans has the same rotational speed, but each time the die passes, the wire becomes smaller in diameter and the discharge speed becomes faster. Therefore, the capstan diameter at the rear stage is increased in accordance with the above-described discharge speed ratio, and the peripheral speed ratio of the capstan is designed to be equal to that.

  However, because it is difficult to manage the wire discharge speed ratio to be strictly constant due to slight deviations in the die diameter, die wear, etc., the actual speed of the capstan is made faster than the wire speed. It is configured to absorb fluctuations in salary balance by slipping between capstans.

  As described above, many improved techniques aiming at improving the quality of wires have been reported. For example, Patent Document 1 discloses a technique for controlling a wire tension fluctuation by controlling a wire drawing speed drawn from a capstan and a final die. Further, Patent Document 2 discloses a technique for preventing a decrease in wire characteristics by using a pressure roller in a drawing capstan and setting a slip at the time of drawing to zero.

JP-A-8-103813 JP-A-8-117834

  According to the techniques of Patent Documents 1 and 2, certain effects can be obtained in improving wire quality and productivity. However, the following points have not been studied, and it cannot be said that sufficient wire quality has been obtained. In other words, it is ideal to improve wire quality by eliminating wire slip on all capstans. However, since the peripheral speed of the capstan is actually the fastest position of the wire, Slip always occurs in a slow place. Further, since the peripheral speed of the capstan also changes depending on the wire diameter, it is necessary to prepare a plurality of capstans, which is not practical due to labor and cost.

  Further, the wire from the upstream die in the wet wire drawing process is wound and driven around the capstan, and generates a pulling force to the upstream die. The next die is arranged on the downstream side of the capstan, and the tension on the downstream side of the capstan is called a back tension to the next die. This back tension is an important mechanical factor for the drawing process, and it is necessary to optimize the value of the back tension for a good drawing process.

  Here, as a means for controlling the back tension, the number of windings of the wire around the capstan, the capstan surface material and roughness can be controlled. Among these, the number of windings on the wire is an important factor for back tension control. Specifically, if you want to increase the back tension to the next die, you need to reduce the number of windings, and if you want to reduce it, you need to increase the number of windings. It could not be said that it was done.

  Accordingly, an object of the present invention is to stabilize the operating state of the wet wire drawing machine, suppress the deterioration of wire quality due to slip, and use a capstan for a wet wire drawing machine that is easy to maintain. It is to provide a wet wire drawing machine.

  In order to solve the above-mentioned problems, the present inventor has intensively studied a capstan for a wet wire drawing machine. As a result, the inventors have found that the above-described problems can be solved by adopting the following configuration, and complete the present invention. It came.

That is, the capstan for wet wire drawing machine of the present invention is a capstan for wet wire drawing machine used for wet wire drawing of steel wires.
A clutch member is provided on the contact surface between the steel wire and the capstan,
The cross-sectional shape in the width direction of the clutch member is an inclined shape.

  In the present invention, the clutch member is preferably composed of an annular elastic member having an opening, and the material is preferably different between the inner peripheral side and the outer peripheral side of the clutch member.

  The wet wire drawing machine of the present invention is characterized by using the capstan for the wet wire drawing machine of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the operation state of a wet wire drawing machine can be stabilized, the deterioration of the wire quality by slip can be suppressed, and the capstan for wet wire drawing machines with easy maintenance, and the wet using the same A wire drawing machine can be provided.

It is a schematic perspective view of the capstan of one embodiment of the present invention. It is a schematic perspective view of an example of a clutch member concerning the present invention. It is the schematic of the apparatus which measures the tension | tensile_strength before and behind a capstan.

Hereinafter, preferred embodiments of the present invention will be described in detail.
FIG. 1 is a schematic perspective view showing a preferred example of a capstan of the present invention. The capstan 10 for a wet wire drawing machine according to the present invention is a capstan for a wet wire drawing machine used for wet wire drawing of a steel wire. Is provided. As the clutch member 1, for example, an annular elastic member (collar-shaped leaf spring) having an opening can be suitably used. In the present invention, the clutch member 1 is interposed between the wire and the capstan 10, the wire and the clutch member 1 are gripped, and the capstan 10 and the clutch member 1 are slipped. Thereby, the slip of a wire can be eliminated and wire quality can be improved.

  That is, when the wire wound around the outer periphery of the clutch member 1 tightens the clutch member 1, the inner peripheral portion of the clutch member 1 increases the contact pressure to the capstan 10, and the driving force is transmitted to the clutch member 1. On the other hand, when the wire wound around the outer periphery of the clutch member 1 is loosened, the inner peripheral portion of the clutch member 1 weakens the contact pressure to the capstan 10 and the driving force transmitted to the clutch member 1 is reduced. By such an action, an appropriate driving force is applied to the wire.

  In order to grip the wire and the clutch member 1 using the clutch member 1 and cause the capstan 10 and the clutch member 1 to slip, the friction force between the wire and the clutch member 1 is changed between the capstan 10 and the clutch member 1. It may be larger than the friction force between. These frictional forces can be appropriately set based on the inner peripheral portion of the clutch member 1 and the material and roughness of the capstan 10.

  Further, in the conventional capstan, the contact between the capstan plane as a differential portion and the wire is a line contact, so that the surface pressure is high and wear tends to proceed. On the other hand, since the capstan 10 of the present invention is a surface contact through the clutch member 1, the wear hardly progresses. Further, even if the capstan 10 is worn, only the clutch member 1 needs to be replaced, and the maintenance man-hour can be simplified. Moreover, if the shape of the clutch member 1 is an annular shape having an opening, it is easy to attach and detach.

  Furthermore, by winding the wire around the outer periphery of the clutch member 1 a plurality of times, the contact surface pressure can be reduced, and the slip in the driving direction on the clutch member 1 can be reduced to zero, Damage can be reduced.

  Furthermore, as described above, conventionally, the control of the back tension at the time of wire drawing could only be intermittently adjusted by changing the number of times of winding the wire around the capstan. However, according to the capstan 10 of the present invention, the back tension can be continuously increased by changing the spring constant of the clutch member 1, the inner peripheral portion of the clutch member 1, the material, roughness, shape, and the like of the capstan 10. Can be changed. Thereby, it is possible to apply an optimal back tension.

  FIG. 2 is a schematic perspective view of an example of the clutch member 1 according to the present invention. In the present invention, as shown in FIG. 2, the cross-sectional shape in the width direction of the clutch member 1 is preferably an inclined shape. Thus, by making the clutch member 1 into an inclined shape, the wire feedability during rotation is improved.

  In the present invention, the material of the clutch member 1 is not particularly limited, and the frictional force between the wire and the clutch member 1 can be made larger than the frictional force between the capstan 10 and the clutch member 1. Other than that, there is no particular limitation, and metal or resin may be used. Further, the inner peripheral portion and the outer peripheral portion of the clutch material 1 may be made of different materials. In order to control the frictional force efficiently, such a structure is preferable.

  The capstan 10 of the present invention is important only in that the clutch member 1 is provided on the contact surface with the wire, and other materials can be appropriately selected according to a conventional method, and are not particularly limited. Absent.

  The wet wire drawing machine of the present invention uses the capstan 10 of the present invention. Since the capstan of the present invention is used, a wire with good quality can be manufactured. Moreover, it has the advantage that the maintenance is easy.

  In the wet wire drawing machine of the present invention, only the point that the capstan is provided with the clutch member is important, and the other die, lubricant, wire used for wire drawing, etc. are usually used. It can select suitably from things, and it does not restrict | limit in particular.

Hereinafter, the present invention will be described in more detail with reference to examples.
(Examples 1-7 and Comparative Examples 1-3)
Using the evaluation apparatus 20 shown in FIG. 3, the tension of the steel wire w before and after the capstan 10 having the clutch member, the scratch on the wire, and the vibration of the wire were measured. An annular elastic member having an opening of the type shown in FIG. 1 was used as the clutch member. Details are summarized in Tables 1 and 2. Here, the front of the capstan 10 refers to a portion from the capstan 10 to the weight 21 and corresponds to a pulling force of the wire from the upstream die in the wet wire drawing process. The term “after the capstan 10” refers to a portion from the capstan 10 to the load cell 22 and corresponds to the back tension of the downstream die in the wet wire drawing process.

  As a condition of the evaluation device 20, a mechanism that holds the capstan through the shaft hole of the capstan 10 of the present invention is used as the holding portion 23, and a wire rod that connects the load cell 22 and the driving means 24 is used as the driving member 24. A manual reel that pulls and moves the load cell 22 by winding is used. Separately, by raising the position of the capstan 10, the peripheral speed of the capstan 10 is apparently made larger than the linear speed of the wire w. The distance from the holding unit 23 to the load cell 22 was about 200 mm. In the figure, 25 is a support and 26 is a pulley. Tables 1 and 2 show the configuration, measurement conditions, and the like of the capstan 10 subjected to the test.

  In the evaluation of the scratch on the wire, “X” is given when there is a scratch on the surface, “◯” when there is a scratch on the surface but there is no practical problem, and “◎” when there is no scratch on the surface. In addition, in the comprehensive evaluation, the case where the wire scratch was ○ or ◎ and the wire vibration was small or extremely small was evaluated as ◯.

  From Tables 1 and 2, it can be seen that the wet wire drawing machine of the present invention can stabilize the operation state of the wet wire drawing machine and suppress the deterioration of the wire quality due to the slip.

DESCRIPTION OF SYMBOLS 1 Clutch member 10 Capstan 20 Evaluation apparatus 21 Weight 22 Load cell 23 Holding part 24 Drive member 25 Strut 26 Pulley

Claims (4)

In the capstan for wet wire drawing machine used for wet wire drawing of steel wire,
A clutch member is provided on the contact surface between the steel wire and the capstan ,
A capstan for a wet wire drawing machine, wherein the cross-sectional shape in the width direction of the clutch member is an inclined shape .   2. The capstan for a wet wire drawing machine according to claim 1, wherein the clutch member is an annular elastic member having an opening. The capstan for a wet wire drawing machine according to claim 1 or 2 , wherein a material is different between an inner peripheral side and an outer peripheral side of the clutch member. Wet-drawing machines, characterized by using a capstan according to claim 1-3, wherein.

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