JP2018135178A - Sheave and continuous softening apparatus - Google Patents

Abstract

To provide a sheave and a continuous softening device capable of producing a soft material having excellent surface properties with high productivity.
A sheave that is provided in a continuous softening device that heats a traveling metal wire by Joule heat and guides the metal wire in a heated state, at least a part of which is made of a carbon material.
[Selection] Figure 1

Description

  The present invention relates to a sheave and a continuous softening device.

  As a continuous softening device that continuously softens a metal wire such as a copper wire, Patent Document 1 discloses a softening device that generates Joule heat by directly passing an electric current through a traveling metal wire and heats the Joule heat. In the softening device of Patent Document 1, a portion of a metal wire that is spanned between two energization sheaves is energized. The energizing sheave is made of metal so that a predetermined voltage can be applied to the metal wire.

JP 2013-087360 A

  It is desired that a soft material having excellent surface properties can be produced with high productivity.

  In order to improve the productivity of the soft material, for example, it is conceivable to increase the supply speed of the metal wire to the continuous softening device (to increase the linear speed). However, for example, when the linear velocity is set to 1500 m / min or more, the surface of the soft material is deteriorated by, for example, scoring the surface of the metal wire that is heated and soft in a metal sheave.

  Accordingly, an object of the present invention is to provide a sieve and a continuous softening device that can produce a soft material with excellent surface properties with high productivity.

The sieve of this disclosure is
It is provided in a continuous softening device that heats a traveling metal wire by Joule heat and guides the heated metal wire, at least a part of which is made of a carbon material.

The continuous softening device of the present disclosure is:
The above-described sheave of the present disclosure is provided.

  The above-described sheave and the above-described continuous softening device can produce a soft material having excellent surface properties with high productivity.

It is a schematic block diagram which shows the continuous softening apparatus of Embodiment 1. It is a disassembled perspective view which shows a split-type sheave.

First, the contents of the embodiment of the present invention will be listed and described.
(1) The sheave according to one aspect of the present invention is
It is provided in a continuous softening device that heats a traveling metal wire by Joule heat and guides the heated metal wire, at least a part of which is made of a carbon material.

  The sheave is made of a material excellent in self-lubricity such as a carbon material such as isotropic graphite. Therefore, even when guiding a metal wire that travels at a high speed of, for example, 1500 m / min or more, the above-described sheave is difficult to catch the metal wire that is heated and in a soft state. And since carbon materials, such as isotropic graphite, have electroconductivity, said sheave can be used for energization members, such as a grounding member. Therefore, according to the above-mentioned sheave, it contributes to producing a soft material with excellent surface properties with high productivity. Furthermore, since carbon materials such as isotropic graphite are excellent in heat resistance and rigidity, the above-mentioned sheave becomes hot due to contact with a heated metal wire, or the above-described high-speed metal wire. Even in the case of guiding, it is difficult to deform and can be used well as a guide member.

(2) As an example of the above sheave,
The form which is a cyclic | annular integral molded object is mentioned.

  In the above configuration, even when the sheave becomes hot due to contact with a heated metal wire, variations in the amount of thermal expansion are unlikely to occur, and variations in the diameter of the soft material due to this variation can be reduced (tests described later). See example). Therefore, the said form can manufacture the soft material which is excellent in surface property and also excellent in dimensional accuracy and shape accuracy with high productivity.

(3) As an example of the above sieve,
The form which is the assembly which combined the some arc-shaped division | segmentation piece is mentioned.

  The said form can make each division | segmentation piece small compared with the case where it is an integral molded object, and it is easy to manufacture a division | segmentation piece.

(4) A continuous softening device according to an aspect of the present invention is provided.
The sheave according to any one of (1) to (3) is provided.

  Since the above-mentioned continuous softening device is provided with the above-mentioned sheave having excellent self-lubricating properties as described above, the metal wire is brazed even when guiding a metal wire that is heated and soft, and further travels at a high speed. hard. Moreover, since the above-mentioned sheave has conductivity as described above, for example, the above-described sheave is used as a grounding member, and a softening process can be stably performed by additionally including an induction heating unit or the like. Such a continuous softening device can produce a metal wire having excellent surface properties with high productivity.

(5) As an example of the above continuous softening device,
The form provided with the cooling fluid tank which cools the metal wire of the said heating state guided by the said sheave is mentioned.

  In the above embodiment, since the sheave formed of the carbon material does not substantially contact the coolant filled in the coolant tank, the sheave can be prevented from being deteriorated due to contact with or absorption of the coolant.

[Details of the embodiment of the present invention]
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings as appropriate.

[Embodiment 1]
<Seeb>
(Overview)
The sheave 1 of Embodiment 1 is a guide member that is provided in a continuous softening device 2 as shown in FIG. 1 and guides a metal wire 100 (indicated by a thick solid line) in a predetermined direction, at least a part of which is carbon. Consists of materials. As an example of the sheave 1, there is an integral sheave 1 </ b> A that is an annular integrally formed body as shown in FIG. 1, and is entirely made of a carbon material. As another example of the sheave 1, as shown in FIG. 2, there is a divided sheave 1 </ b> B that is a combination of a plurality of arc-shaped divided pieces 10, and each divided piece 10 is made of a carbon material.
Details will be described below.

(Constituent materials, properties)
A typical carbon material constituting the sheave 1 is a CIP material (generally called isotropic graphite) obtained by molding graphite powder by cold isostatic pressing (CIP). Isotropic graphite has properties such as excellent self-lubricity, excellent heat resistance, high rigidity, and conductivity. The sheave 1 composed of such a carbon material such as isotropic graphite is not easily deformed (heat resistance and rigidity) even when heated to a high temperature due to contact with the heated metal wire 100, and is soft when heated. When guiding the metal wire 100, it is difficult to scratch the surface of the metal wire 100 (self-lubricating property). Further, the sheave 1 can stably guide the metal wire 100 traveling at high speed (rigidity).

(Shape, size)
The integrated sheave 1A is an annular body having an annular groove portion (see FIG. 2, groove portion 11) continuous in the circumferential direction on the outer peripheral surface thereof. An annular groove is used as a guide groove for the metal wire 100. The inner diameter, outer diameter, thickness, groove depth, etc. of the sheave 1A and a divided sheave 1B (assembly), which will be described later, are appropriately determined according to the size of the metal wire 100 (wire diameter, etc.) and the allowable bending radius. You can choose.

  In the divided sheave 1B, the number of divisions can be selected as appropriate. The sheave 1 </ b> B shown in FIG. 2 is a set of 12 divided pieces 10. The number of divisions can be 2 or more and 11 or less, or 13 or more. The larger the number of divisions, the easier it is to make each divided piece 10 smaller and the more excellent the productivity of the divided piece 10.

  Groove portions 11 that are continuous in the circumferential direction are provided on the outer peripheral surface of each divided piece 10. These groove portions 11 form an annular groove that is continuous in the circumferential direction of the assembly in the assembly in which the plurality of divided pieces 10 are combined in an annular shape. This annular groove is used as a guide groove for the metal wire 100.

  Each divided piece 10 can have a different shape and size by changing the central angle of the arc in each divided piece 10. As shown in this example, if each divided piece 10 has the same shape and size, that is, if the torus is equally divided, the productivity of the divided piece 10 is excellent and a braid is easily constructed.

  For example, the assembly of the plurality of divided pieces 10 may be configured so as to maintain an integrally assembled state by being sandwiched between a pair of disk-shaped support plates 12 and 14. For example, the assembly is sandwiched between the support plates 12 and 14, and the laminate is tightened with a tightening member (not shown) such as a bolt. A fastening member is arrange | positioned inside the inner peripheral surface of a braid. By doing so, the fastening member does not get in the way, and the metal wire 100 can be bridged over the groove portion 11 provided on the outer peripheral surface of the assembly. A shaft hole through which a rotating shaft (not shown) is inserted is provided at the center of the support plates 12 and 14.

<Continuous softening device>
(Overview)
The continuous softening device 2 according to the first embodiment is a device that continuously softens the metal wire 100 that travels by heating with the Joule heat to soften the metal wire 100. As a guide member for the metal wire 100, the continuous softening device 2 according to the first embodiment is used. A sheave 1 is provided. The continuous softening device 2 of this example is an induction heating device including induction heating units 202 and 204, and heats the metal wire 100 by Joule heat based on the induction current. Moreover, the continuous softening apparatus 2 of this example is provided with the softening part 20 provided with the induction heating parts 202 and 204, and the cooling part 22 which cools the metal wire 100 in a heating state. In particular, in this example, the softening unit 20 and the cooling unit 22 are provided so as to be arranged in the front-rear direction as viewed in the traveling direction of the metal wire 100 (in the horizontal direction in FIG. 1). The softening unit 20 includes two sheaves, a grounding sheave and an insulating sheave 201, and includes the sheave 1 of the first embodiment as the grounding sheave. Details will be described below.

(Softening part)
The softening unit 20 includes a grounding sheave (the sheave 1 of the first embodiment), an insulating sheave 201, and induction heating units 202 and 204 interposed between the sheaves 1 and 201 that are separated from each other. A ground wire 21 is connected to the grounding sheave. The insulating sheave 201 is a guide member made of an electrically insulating material such as ceramics. The induction heating units 202 and 204 include cylindrical coils (not shown). Each coil generates a magnetic flux corresponding to an energization current supplied to the coil from a power source (not shown).

  The metal wire 100 is arranged in the softening portion 20 as follows, an induced current is passed through the metal wire 100, and Joule heat is generated in the metal wire 100 by this induced current. The metal wire 100 is bridged so as to draw a loop on the separated sheaves 1,201. In this example, the metal wire 100 introduced into the softened portion 20 returns to the sheave 1 from the grounding sheave (the sheave 1 of the first embodiment) through the insulating sheave 201 (see the white arrow), and is cooled from the sheave 1. It arrange | positions so that it may progress to the part 22 (refer black-filled arrow). The part arrange | positioned between both sheaves 1,201 among the metal wires 100 is arrange | positioned so that the cylindrical coil with which the induction heating parts 202 and 204 are equipped may be penetrated. Therefore, an induced current is generated in the portion of the metal wire 100 in the coil by the interlinkage magnetic flux from the coil. The induced current flows along the metal line 100 arranged in a loop. The insulating sheave 201 is electrically insulated against this induced current.

  In this example, the grounding sheave (the sheave 1 of the first embodiment) and the insulating sheave 201 are arranged so as to be lined up and down, but can also be arranged so as to be lined up in the left and right. Moreover, in this example, it is made of a carbon material, and the lightweight sheave 1 is arranged on the upper side and the insulating sheave 201 made of ceramics is arranged on the lower side. However, the upper and lower sides can be switched. As shown in this example, two sheaves 1,201 are arranged one above the other and the cooling unit 22 described later is also configured to be vertically long, so that the horizontal length can be easily shortened and the installation area of the continuous softening device 2 can be reduced. Easy to make small.

(Cooling section)
The cooling unit 22 includes a coolant tank 220 filled with a coolant 22L that cools the heated metal wire 100 guided by the sheave 1. The cooling unit 22 in this example includes a U-shaped cooling liquid tank 220, a tank sheave 221 disposed in the cooling liquid tank 220, and an introduction sheave 223 that guides the metal wire 100 from the sheave 1 to the cooling liquid tank 220. And a discharge sheave 225 for guiding the metal wire 100 from the coolant tank 220 to the outside of the cooling unit 22. The introduction sheave 223 is interposed between the carbon material sheave 1 and the cooling liquid tank 220, and the cooling liquid tank 220 is arranged at some distance from the carbon material sheave 1, thereby cooling the carbon material sheave 1. The liquid 22L does not substantially contact. Furthermore, the cooling unit 22 of this example also includes a drying unit 227 that dries the metal wire 100 that has passed through the coolant bath 220.

  The cooling liquid tank 220 cools the metal wire 100 in a heated state by immersing it in the cooling liquid 22L to obtain a predetermined soft material 110. In order to cool the metal wire 100 to a predetermined temperature, the coolant tank 220 may be required to have a certain length of passage distance of the metal wire 100 (a longer contact time with the coolant 22L). In this case, if the coolant tank 220 is a rectangular parallelepiped container, a long container is required, and the installation area tends to be large. When the U-shaped coolant tank 220 is used as in this example, it is easy to ensure a sufficiently long passage distance while reducing the installation area. As the coolant 22L, a known one such as water can be used. As the in-vessel sheave 221, the introduction sheave 223, and the discharge sheave 225, known ones can be used. For example, the drying unit 227 includes an air wiper.

<Metal wire>
The metal wire 100 typically includes a long wire made of a metal such as copper, a copper alloy, aluminum, or an aluminum alloy. Examples of the metal wire 100 include a single wire (typically a round wire), a twisted wire obtained by twisting a plurality of strands (typically a round wire), and the like.

(Main effect)
Since the sheave 1 of the first embodiment is made of a material having excellent self-lubricity such as a carbon material such as isotropic graphite, the metal wire 100 is used even when guiding the metal wire 100 that travels at a high speed of, for example, 1500 m / min or more. It is difficult to find. Therefore, the sheave 1 of Embodiment 1 contributes to producing the soft material 110 having excellent surface properties with high productivity. In particular, in the case of the integrated sheave 1A (FIG. 1), the soft material 110 having excellent dimensional accuracy and shape accuracy can be manufactured by reducing the wire diameter variation of the soft material 110 and the like. These effects will be specifically described in Test Example 1.

  Since the continuous softening device 2 of the first embodiment includes the sheave 1 of the first embodiment that is excellent in self-lubricating property, even when the metal wire 100 that is heated and in a soft state or the metal wire 100 that runs at high speed is guided, the metal wire It is difficult to find 100. Therefore, the continuous softening device 2 can manufacture the soft material 110 having excellent surface properties with high productivity. In particular, if the carbon material sheave 1 is not used as the in-tank sheave 221 but is arranged outside the cooling liquid tank 220 so as not to substantially contact the cooling liquid 22L, it can be used for contact with and absorption of the cooling liquid 22L. The resulting deterioration of the sheave 1 can be prevented.

[Test Example 1]
Using a continuous softening device equipped with a sheave made of carbon as a sheave for grounding, the metal wire was softened and the change in the diameter of the obtained soft material was examined.

(No. 1-1)
Sample No. 1-1 sheave is an annular integral molded body made of isotropic graphite.
(No. 1-2)
Sample No. The 1-2 sheave is a braid that combines a plurality of arc-shaped divided pieces made of isotropic graphite into a single torus. In this test, a set of 12 divided pieces was used, and the shape and size of each divided piece were made equal. The central angle of each divided piece is 30 °. The outer diameter and thickness of the assembly are the same as the sample No. It is substantially equal to 1-1 integral sheave.

  In this test, sample no. A device No. 1-1 having a sheave 1-1. 1 and sample no. Device No. 1-2 having a sheave of 1-2. Two continuous softening devices 2 were prepared. The basic configuration of the continuous softening device here is the same as that of the continuous softening device 2 (FIG. 1) of Embodiment 1 described above, which is of the induction heating type, and includes a grounding sheave, an insulating sheave and an induction heating. A softening section including a cooling section and a cooling section including a cooling liquid tank (details are omitted). As a metal wire, a copper wire having a circular cross section and a wire diameter of 2.0 mm was prepared. Using each apparatus, the soft material was continuously manufactured, and the wire diameter of the obtained soft material was measured. The linear velocity was 1500 m / min, and the wire diameter was measured using a commercially available measuring device having a resolution of once every 0.2 milliseconds. In this example, the wire diameter can be measured at intervals of 5 mm. The measured softwood length is about 1500 m (about 40 kg). Table 1 shows the average diameter (mm), maximum diameter (mm), minimum diameter (mm), and standard deviation.

  Device No. 1, No. 1 When the surface property of the soft material manufactured by No. 2 was examined (here, visually confirmed), there was no wrinkle that could be visually confirmed, and the surface property was excellent. Which device No. 1, No. 1 Also, since the grounding sheave has a structure that does not substantially contact the coolant, it can be prevented that the grounding sheave absorbs the coolant and deteriorates. It is thought.

  As shown in Table 1, the apparatus No. 1 provided with an integral sheave. 1, the standard deviation of the wire diameter of the soft material is 0.001, and the apparatus no. It can be seen that the wire diameter variation of the soft material is small compared to 2. One of the reasons why such a result was obtained is considered as follows. In a divided sheave, due to variations in the amount of thermal expansion of the divided pieces, a minute step or a minute gap occurs in the adjacent divided pieces, and the groove formation surface does not become a smooth continuous surface but is heated. It is considered that the wire diameter of the soft material is likely to fluctuate because the metal wire in the soft state follows the groove forming surface. In the integrated sheave, it is considered that the wire diameter of the soft material is hardly changed because the formation surface of the groove portion can maintain a smooth continuous surface.

  From the above test, it was shown that by using a sheave composed of a carbon material such as isotropic graphite, a soft material having excellent surface properties can be produced with high productivity. In particular, it has been shown that by using an integral sheave, a soft material having superior dimensional accuracy and shape accuracy can be produced.

  The present invention is not limited to these exemplifications, but is defined by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1, 1A, 1B Sheave 10 Divided piece 11 Groove part 12, 14 Support plate 2 Continuous softening device 20 Softening part 21 Ground wire 201 Insulating sheave 202, 204 Induction heating part 22 Cooling part 220 Cooling liquid tank 22L Cooling liquid 221 In-tank sheave 223 Introducing sheave 225 Discharging sheave 227 Drying unit 100 Metal wire 110 Soft material

Claims (5)

  A sheave that is provided in a continuous softening device that heats a traveling metal wire by Joule heat and guides the metal wire in a heated state, at least a part of which is made of a carbon material.   The sheave according to claim 1, wherein the sheave is an annular integrally formed body.   The sheave according to claim 1, wherein the sheave is a combination of a plurality of arc-shaped divided pieces.   A continuous softening device comprising the sheave according to any one of claims 1 to 3.   The continuous softening apparatus according to claim 4, further comprising a coolant tank that cools the heated metal wire guided by the sheave.

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