JP6155035B2 - Energizing device and heating device - Google Patents

Description

  The present invention relates to a current-carrying device for a wire heated by direct resistance heating, and a heating device provided with the current-carrying device.

  As a heating device that heats the wire when the wire is subjected to heat treatment such as quenching or annealing, or forging, it runs through this section in a section of the transport path of the continuously transported wire. 2. Description of the Related Art A heating apparatus that heats a wire by direct resistance heating by passing an electric current through the wire is known (for example, see Patent Document 1).

  The heating device described in Patent Document 1 includes two roller pairs arranged at intervals in the conveying direction of the wire, a transformer having an annular core arranged between the two roller pairs, and straddling the transformer. And a conductive member connecting the two roller pairs. The wire is conveyed through a hole in the center of the transformer. The roller pair sandwiches the wire rod between the outer peripheral surfaces and rolls on the conveyed wire rod.

  The secondary winding of the transformer is configured by the two roller pairs, the conductive member connecting the two roller pairs, and the wire running between the two roller pairs. When AC power is supplied to the primary winding of the transformer, current flows through the wire running between the two roller pairs by electromagnetic induction, and the wire is heated.

JP-A-63-128125

  From the viewpoint of restricting the device layout in the wire production line and shortening the length of the production line, it is required to reduce the size of the heating device, and in particular, to reduce the size of the heating device in the wire conveying direction.

  In order to reduce the size of the heating device, for example, it is conceivable to reduce the diameter of the roller. However, in order to heat the wire by direct resistance heating, it is necessary to pass a large current through the wire. When the diameter of the roller is reduced, the contact area between the roller and the wire is reduced, and there is a risk that sparks are generated between the roller and the wire. And when a spark generate | occur | produces, a spark trace will arise on the wire surface and we are anxious about the quality fall of a wire. For this reason, it has been considered difficult to reduce the diameter of the roller.

  This invention is made | formed in view of the situation mentioned above, and aims at miniaturizing the heating apparatus which heats a wire by direct resistance heating.

(1) A current-carrying device for a wire heated by direct resistance heating, including a pair of rollers that sandwich a continuously conveyed wire between outer peripheral surfaces and roll on the wire, and the pair of rollers A support unit that rotatably supports and moves the pair of rollers in contact with and apart from the wire by translating the pair of rollers in a direction opposite to each other in a direction orthogonal to the conveying direction of the wire; A contact portion that is in sliding contact with a roller and connected to a current path of a current that flows through the wire, and the support portion includes a linear motion mechanism that is provided for each roller of the pair of rollers, Adjacent to the first end face side, the linear motion mechanism includes a guide block that rotatably supports the roller, and a guide rail that supports the guide block to be movable in the translational movement direction of the roller, Previous A power source that moves the guide block, and the contact portion is in sliding contact with a second end surface opposite to the first end surface of each of the pair of rollers.
(2) A heating device that heats a continuously conveyed wire by direct resistance heating, the first and second energization devices arranged at intervals in the conveyance direction of the wire, and the first A current supply unit configured to supply current to the wire through the energization device and the second energization device, and each of the first energization device and the second energization device sandwiches the wire between outer peripheral surfaces. A pair of rollers that roll on the wire, and the pair of rollers are rotatably supported, and the pair of rollers are translated in a direction opposite to each other in a direction perpendicular to the conveying direction of the wire. A support part that contacts and separates the roller with respect to the wire, and a contact part that is in sliding contact with the pair of rollers and connected to a current path of a current that flows through the wire, and the support part includes the pair of rollers . Provided for each roller A linear motion mechanism, which is adjacent to the first end surface of the pair of rollers, and the linear motion mechanism includes a guide block that rotatably supports the roller, and the guide in the translational movement direction of the roller. A guide rail for movably supporting the block; and a drive source for moving the guide block, wherein the contact portion is a second end surface opposite to the first end surface of each of the pair of rollers. Heating device that slides on the surface.

  A pair of rollers are translated in opposite directions in a direction perpendicular to the wire conveying direction, the wire is sandwiched between the outer peripheral surfaces of the pair of rollers, and the pair of rollers and the wire are electrically connected to each other. A heating device provided with an apparatus can be reduced in size in a wire conveyance direction.

  Then, the contact portion is slidably brought into contact with the end surface of the roller opposite to the side where the support portion for moving the pair of rollers in translation is provided, and the pair of rollers and the contact portion are electrically connected to each other. The degree of freedom of arrangement can be increased. Thereby, the protrusion of the contact portion from the roller in the wire conveyance direction can be avoided, and the energization device and the heating device can be reduced in size in the wire conveyance direction.

It is a figure showing typically composition of an example of a production line of a wire rod provided with a heating device for explaining an embodiment of the present invention. It is a figure which shows typically the structure of the heating apparatus installed in the production line of FIG. It is a figure which shows the structure of the electricity supply apparatus provided in the heating apparatus of FIG. It is a figure which shows typically the structure of the modification of the heating apparatus of FIG. It is a figure which shows the structure of the electricity supply apparatus as a reference example. It is a figure which shows the structure of the electricity supply apparatus of FIG.

  FIG. 1 shows a configuration of an example of a production line of a wire rod provided with a heating device for explaining an embodiment of the present invention.

  The production line shown in FIG. 1 is a wire drawing line of a wire W, a shot blasting device 1 that removes scales and the like on the surface of the wire, a correction device 2 that corrects bending wrinkles and the like of the wire W, a heating device 3, A drawing device 4 for forming the wire W into a desired cross-sectional shape is provided, and these devices are sequentially installed in the conveying direction of the wire W.

  The heating device 3 is configured so that the wire W continuously conveyed is heated between the straightening device 2 and the drawing device 4 by direct resistance heating to a warm processing temperature, that is, a temperature higher than room temperature and lower than a recrystallization temperature of the wire material. Heat. The wire drawing process is generally performed in a cold state, but cracking of the wire W can be prevented by performing the process in a warm state.

  FIG. 2 shows the configuration of the heating device 3.

  The heating device 3 supplies a current to the wire W via the first energization device 10 and the second energization device 11 arranged at intervals in the conveying direction of the wire W, and the first energization device 10 and the second energization device 11. And a current supply unit 12 for supply.

  Each of the 1st electricity supply apparatus 10 and the 2nd electricity supply apparatus 11 pinches the wire W between outer peripheral surfaces, and a pair of roller 20 which rolls on the wire W continuously conveyed, and these slidably contacts 20 And a contact portion 21.

  In the heating device 3, the current supply unit 12 includes an annular core 30 through which the wire W is inserted, a primary winding 31 wound around the core 30, a power supply 32 that supplies an alternating current to the primary winding 31, It is comprised with the electrically-conductive member 33 which connects each contact part 21 of the 1 electricity supply apparatus 10 and the 2nd electricity supply apparatus 11 mutually.

  The pair of rollers 20 and the contact portion 21 of each of the first energization device 10 and the second energization device 11, the conductive member 33 connecting the two contact portions 21, and the first energization device 10 and the second energization device 11. A secondary winding that circulates around the core 30 is formed by the wire W running between them. When AC power is supplied to the primary winding 31, the wire W that forms a part of the secondary winding, that is, a heating section between the first energization device 10 and the second energization device 11, travels by electromagnetic induction. A current flows through the wire W, and the wire W is heated to the warm working temperature by direct resistance heating.

  The warm working temperature varies depending on the wire material or the wire W, but is about 500 ° C. for steel wire forging, for example. When forming a coil spring by forming a steel wire into a coil shape, the steel wire that has been quenched and tempered is heated at a warm working temperature of 550 ° C. or lower when forming the steel wire into a coil shape. The heating device 3 can also be used when forming into a coil shape in this state. The steel wire used here is an oil tempered wire, for example, based on SWOSC-B (silicon chrome steel oil tempered wire for springs), and a special element (for example, V (vanadium) etc.) is added as necessary. It is a steel wire.

  FIG. 3 shows the configuration of the first energization device 10.

  As described above, the first energization device 10 includes the pair of rollers 20 and the contact portion 21, and further supports the pair of rollers 20 rotatably and makes contact with and separate from the wire W. have.

  In the heating device 3 that heats the wire W to the warm working temperature, the wire W is compared with a case where the wire W is heated to a heat treatment temperature such as quenching or annealing or a hot working temperature (above the recrystallization temperature of the wire material). Since the flowing current is relatively small and the influence of the heating temperature is small, in the first energization device 10 of the heating device 3, the diameter of the roller 20 is reduced within a range in which no spark is generated between the roller 20 and the wire W. Yes. Thereby, the 1st electricity supply apparatus 10 is reduced in size in a wire conveyance direction.

  And the roller 20 is comprised as an idler which passively rolls by friction with the wire W conveyed.

  When the wire W is heated to the heat treatment temperature or the hot working temperature by direct resistance heating, as described above, the roller diameter needs to be relatively large in relation to the current flowing through the wire W and the heating temperature. The torque required for rotation is large. Therefore, typically, a motor that rotationally drives the roller is provided, and the roller is rotationally driven by the motor and actively rolls on the wire W. On the other hand, in the 1st electricity supply apparatus 10, since the diameter of the roller 20 is comparatively small and the torque required for rotation of the roller 20 is also small in relation to the electric current sent to the wire W, and heating temperature, the roller 20 is comprised as an idler. It becomes possible to do. In other words, the diameter of the roller 20 is small enough to be configured as an idler.

  Further, by configuring the roller 20 as an idler, a motor for rotationally driving the roller 20 can be omitted. Thereby, the 1st electricity supply apparatus 10 is reduced in size. Note that it is not essential to configure the roller 20 as an idler, and a motor (drive unit) that rotates the roller 20 may be provided even if the torque required for the rotation of the roller 20 is small.

For example, until now, a roller having a diameter of about 360 mm was used regardless of the heating temperature of the wire, and when the wire was heated under the following conditions, the diameter of the roller 20 could be reduced to about 250 mm without generating a spark. .
Wire material: Steel Wire diameter: φ20mm max
Conveyance speed: 50m / min max
Heating temperature: Warm processing temperature range

  The support unit 22 translates these rollers 20 in the direction orthogonal to the conveying direction of the wire W in a plane where the pair of rollers 20 are arranged in parallel, and the pair of rollers 20 moves between the outer peripheral surfaces. The pair of rollers 20 are brought close to the wire rod W and separated from the wire rod W so as to sandwich the wire.

  The support portion 22 has a linear motion mechanism provided for each roller 20. Each linear motion mechanism moves the guide block 40 in the translational movement direction of the roller 20 and the guide block 40 that rotatably supports the roller 20. The guide rail 41 that can be supported and a drive source that moves the guide block 40 are included.

  In the illustrated example, the drive source for moving the guide block 40 is a fluid pressure cylinder 42 having a piston rod connected to the guide block 40 and a pump (not shown) for supplying a working fluid such as air to the cylinder 42. It is configured.

  The cylinder 42 presses the guide block 40 by the pressure transmitted from the pump via the working fluid, and moves the guide block 40 in a direction in which the roller 20 approaches the wire W. The cylinder 42 is provided with a spring (not shown) that pushes back the piston rod, and the cylinder 42 automatically separates the roller 20 from the wire W as the internal pressure is released.

  The drive source for moving the guide block 40 can also be configured using a ball screw, a rack and pinion, or the like.

  The pair of rollers 20 are translated and moved in a direction opposite to each other in the direction orthogonal to the conveying direction of the wire W by the support portion 22, and the wire W is sandwiched between the outer peripheral surfaces thereof. Thereby, conduction between the pair of rollers 20 and the wire W is taken.

  As described above, when the wire W is sandwiched between the outer peripheral surfaces of the pair of rollers 20 and the pair of rollers 20 and the wire W are electrically connected, the pair of rollers 20 are opposite to each other in a direction orthogonal to the conveying direction of the wire W. Accordingly, each roller 20 is not displaced in the wire conveyance direction, and there is no need to provide a space next to each roller 20 in the wire conveyance direction. Thereby, the 1st electricity supply apparatus 10 is reduced in size in a wire conveyance direction.

  The support portion 22 configured as described above is provided adjacent to the first end face side that faces vertically below the roller 20.

  The contact portion 21 has a plurality of contacts 50 that are in sliding contact with the pair of rollers 20, and a holding body 51 that holds these contacts 50. One or more contacts 50 are provided for each roller 20, and the positions of the contacts 50 are fixed so as to be in contact with the second end surface 20 a facing the vertical direction of the corresponding roller 20. And relatively slides on the second end surface 20a. Thereby, conduction between the contact portion 21 and the pair of rollers 20 is established. These contacts 50 are electrically connected to the conductive member 33 (see FIG. 2) via a cable and a holding body 51 (not shown).

  Note that the number of contacts 50 for each roller 20 is appropriately set according to the current flowing through the wire W, and in the illustrated example, four contacts 50 are provided for each roller 20.

  Here, the contact 50 can be slidably brought into contact with the first end surface of the roller 20 facing the support portion 22 side. In this case, the guide block 40 of the support portion 22 that overlaps the center portion of the first end surface can be used. It is necessary to arrange the contact 50 while avoiding the movement locus, and the contact 50 is brought into sliding contact with the edge portion of the first end face near the wire conveyance direction. Therefore, particularly in the first energization device 10 in which the roller 20 has a relatively small diameter, the contact portion 21 may protrude from the roller 20 in the wire conveyance direction.

  Further, when the contact 50 is brought into sliding contact with the outer peripheral surface of the roller 20, it is necessary to dispose the contact 50 while avoiding the movement locus of the roller 20. It protrudes in the wire conveying direction.

  On the other hand, if the contact 50 is brought into sliding contact with the second end surface 20a of the roller 20 to establish conduction between the contact portion 21 and the pair of rollers 20, interference with the support portion 22 and the roller 20 may occur. Therefore, the degree of freedom of arrangement of the contact portion 21 is high, and the protrusion of the contact portion 21 from the roller 20 in the wire conveyance direction can be avoided. Thereby, the 1st electricity supply apparatus 10 is reduced in size in a wire conveyance direction.

  Furthermore, in the 1st electricity supply apparatus 10, the contact 50 is arrange | positioned so that the center part in the 2nd end surface 20a of the corresponding roller 20 may be slidably contacted. Thereby, the increase in the torque resulting from the sliding contact of the contact 50 can be suppressed, and the roller 20 configured as an idler can be smoothly rolled.

  The 2nd electricity supply apparatus 11 is comprised similarly to the 1st electricity supply apparatus 10 mentioned above, and is reduced in size similarly to the 1st electricity supply apparatus 10. FIG.

  As described above, the pair of rollers 20 are translated in opposite directions in the direction orthogonal to the wire conveying direction so that the wire is sandwiched between the outer peripheral surfaces of the pair of rollers 20, and the pair of rollers 20 and the wire W are electrically connected. By taking this, it is possible to reduce the size of the energizing devices 10 and 11 and the heating device 3 including the energizing devices 10 and 11 in the wire conveying direction.

  Then, the contact 50 is slidably brought into contact with the second end surface 20a of the roller 20 on the side opposite to the side on which the support portion 22 that translates the pair of rollers 20 is provided, and the contact portion 21 and the pair of rollers 20 The degree of freedom of the arrangement of the contact portion 21 can be increased by taking the conduction. Thereby, the protrusion of the contact portion 21 from the roller 20 in the wire conveyance direction can be avoided, and the energization devices 10 and 11 and the heating device 3 can be reduced in size in the wire conveyance direction.

  In addition, the structure of the contact part 21 and the support part 22 of the energization apparatus 10 and 11 mentioned above is applicable also to the energization apparatus of the heating apparatus which heats a wire to a heat treatment temperature or a hot working temperature by direct resistance heating. Even in this case, the heating device and the energization device can be reduced in size.

  In addition, the configuration of the current supply unit that supplies current to the wire in the heating device is not limited to that described above. The current supply unit 112 of the heating device 103 illustrated in FIG. 4 includes a power source 132 and a conductive member 133 that connects the power source 132 to each contact portion 21 of the first energization device 10 and the second energization device 11. A current is directly supplied from the power source 132 to the wire W.

  5 and 6 show a configuration of an energization device as a reference example.

  5 and 6 includes a pair of rollers 220, a contact portion 221 that is in sliding contact with the pair of rollers 220, and a support that rotatably supports the pair of rollers 220 and contacts and separates the wire W. Part 222.

  The support portion 222 swings the rollers 220 in the opposite directions within a plane in which the pair of rollers 220 are arranged side by side, and the pair of rollers 220 causes the pair of rollers 220 to sandwich the wire W between the outer peripheral surfaces. It is made to approach and separate from the wire W.

  The support unit 222 has a swing mechanism provided for each roller 220, and each swing mechanism includes an arm 240 that rotatably supports the roller 220 and a cylinder 242 as a drive source that swings the arm 240. It is comprised including.

  The arm 240 rotatably supports the roller 220 at one end 240a, and the rotation axis O of the arm 240 is provided at the other end 240b of the arm 240.

  The cylinder 242 presses the end 240a of the arm 240 that supports the roller 220 in a direction in which the roller 220 approaches the wire W. As a result, the roller 220 is swung around the rotation axis O of the arm 240 and approaches the wire W.

  Then, the pair of rollers 220 are swung reversely by the support portion 222, and the wire W is sandwiched between the outer peripheral surfaces thereof. Thereby, conduction between the pair of rollers 220 and the wire W is established.

  The support part 222 configured as described above is provided adjacent to the first end face 220b side that faces vertically below the pair of rollers 220.

  The contact portion 221 includes a plurality of contacts 250 that are in sliding contact with the pair of rollers 220, and a holding body 251 that holds these contacts 250. One or more contacts 250 are provided for each roller 220, and their positions are fixed while being in contact with the first end surface 220 b facing vertically below the corresponding roller 220. And relatively slides on the first end face 220b. Thereby, conduction between the contact portion 221 and the pair of rollers 220 is established. These contactors 250 are electrically connected to, for example, the conductive member 33 (see FIG. 2) of the heating device 3 or the conductive member 133 (see FIG. 4) of the heating device 103 described above via the cable 252 and the holding body 251. Connected to.

  In the energization device 210, the pair of rollers 220 are swung and displaced in the wire conveying direction, so that a space S is provided adjacent to the rollers 220 in the wire conveying direction. Further, since the contact 250 is in sliding contact with the first end surface 220b of the roller 220 facing the support portion 222, the edge of the first end surface 220b near the wire conveyance direction is avoided while avoiding the movement path of the arm 240 of the support portion 222. It arrange | positions so that a part may be slidably contacted.

  In the energization device 210 configured as described above, the contact 250 is in sliding contact with the first end surface 220b facing vertically below the roller 220, and dust and other foreign matters are in contact with the roller 220 and the contact 250. It is prevented from being deposited on the surface. Therefore, the maintainability of the apparatus is excellent.

  In the energizing device 210 as well, as in the energizing device 10 described above, the pair of rollers 220 is translated in the opposite direction to each other in the direction orthogonal to the wire conveying direction, and the wire is placed between the outer peripheral surfaces of the pair of rollers 220. The pair of rollers 220 and the wire W may be electrically connected. Accordingly, the energization device 210 can be reduced in size in the wire conveying direction.

DESCRIPTION OF SYMBOLS 3 Heating apparatus 10 1st electricity supply apparatus 11 2nd electricity supply apparatus 12 Current supply part 20 Roller 20a The 2nd end surface 21 of a roller Contact part 22 Support part 30 Core 31 Primary winding 32 Power supply 33 Conductive member W Wire material

Claims (7)

A current-carrying device for a wire heated by direct resistance heating,
A pair of rollers that sandwich the continuously conveyed wire rod between the outer peripheral surfaces and roll on the wire rod;
A support portion that rotatably supports the pair of rollers and moves the pair of rollers in contact with and apart from the wire by translating the pair of rollers in a direction opposite to each other in a direction perpendicular to the conveying direction of the wire. When,
A contact portion that is in sliding contact with the pair of rollers and connected to a current path of a current flowing through the wire;
With
The support portion includes a linear motion mechanism provided for each roller of the pair of rollers, and is adjacent to the first end face side of the pair of rollers,
The linear motion mechanism includes a guide block that rotatably supports the roller, a guide rail that movably supports the guide block in a translational movement direction of the roller, and a drive source that moves the guide block. ,
The energization device, wherein the contact portion is in sliding contact with a second end surface opposite to the first end surface of each of the pair of rollers. It is an electricity supply apparatus of Claim 1, Comprising:
Current-carrying device for wire that is heated to the warm working temperature. It is an electricity supply apparatus of Claim 1 or 2, Comprising:
The contact portion is an energization device that slidably contacts a central portion of the second end surface of each of the pair of rollers. A heating device that heats continuously conveyed wire by direct resistance heating,
A first energization device and a second energization device arranged at intervals in the conveying direction of the wire,
A current supply unit for supplying current to the wire through the first energization device and the second energization device;
With
Each of the first energization device and the second energization device is:
A pair of rollers that sandwich the wire rod between outer peripheral surfaces and roll on the wire rod;
A support portion that rotatably supports the pair of rollers and moves the pair of rollers in contact with and apart from the wire by translating the pair of rollers in a direction opposite to each other in a direction perpendicular to the conveying direction of the wire. When,
A contact portion that is in sliding contact with the pair of rollers and connected to a current path of a current flowing through the wire;
Have
The support portion includes a linear motion mechanism provided for each roller of the pair of rollers, and is adjacent to the first end face side of the pair of rollers,
The linear motion mechanism includes a guide block that rotatably supports the roller, a guide rail that movably supports the guide block in a translational movement direction of the roller, and a drive source that moves the guide block. ,
The said contact part is a heating apparatus which slidably contacts the 2nd end surface on the opposite side to the said 1st end surface of each of a pair of said roller. The heating device according to claim 4,
A heating device for heating the wire to a warm working temperature. The heating device according to claim 4 or 5,
The said contact part is a heating apparatus which slidably contacts the center part in the said 2nd end surface of each of a pair of said roller. The heating device according to any one of claims 4 to 6,
The current supply unit includes an annular core through which the wire is inserted, a primary winding wound around the core, a power source that supplies an alternating current to the primary winding, the first energization device, and the second A heating device comprising: a conductive member that connects the contact portions of the energization device to each other to form a secondary winding together with the wire.

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