JP4410593B2 - Roll rolling machine - Google Patents

Description

  The present invention relates to a rolling mill used for rolling wire rods or steel bars, and more particularly to the structure of a rolling mill provided with a rolling roll.

FIG. 3 is a cross-sectional view showing the structure of a conventional three-roll rolling mill.
As shown in the figure, the rolling mill 1 is provided with three rolls 2 to 4, which are arranged so as to intersect each other at an angle of 120 ° (degree) in the casing 5. Grooves for rolling are provided at the peripheral end portions of the rolls 2 to 4, and the substantially circular gap 6 is obtained by arranging the rolls 2 to 4 at predetermined positions (positions shown in the figure). Is formed. Each roll 2-4 is rotationally driven by a predetermined drive device, and the wire or the like to be rolled is fed into the gap 6 between each roll 2-4. Thereby, a wire etc. are rolled so that it may become the external diameter dimension designed previously.

  Therefore, in order for the outer diameter dimension of the wire to be finished with high accuracy as designed, the dimension of the gap 6, that is, the positions of the rolls 2 to 4 need to be set accurately. The same applies to a 2-roll, 4-roll or 5-roll rolling mill regardless of the number of rolls. Conventionally, in such a roll-type rolling mill, various means for improving the positioning accuracy of each roll and simplifying the work have been proposed (see, for example, Patent Document 1).

  By the way, each said roll 2-4 has been conventionally positioned in the following ways. First, the roll 3 and the roll 4 are rotatably supported by a predetermined support shaft and positioned at a predetermined position with respect to the housing 5. The roll 2 is fixed by being fitted into the hub 7. As this fixing means, for example, an oil injection method is employed. The roll 2 fixed to the hub 7 is accommodated in the roll accommodating portion 8 of the housing 5. In this state, the rotating shaft 9 is inserted. The rotation shaft 9 is a drive shaft. The rotating shaft 9 is inserted into the roll accommodating portion 8 from the outside of the housing 5 and penetrates the hub 7. The rotating shaft 9 is fixed to the hub 7 by, for example, an oil injection method.

  The housing 5 is provided with a tie rod 10. When the rotary shaft 9 is inserted into the housing 5, the tie rod 10 is inserted through the rotary shaft 9 at the same time. In this state, the tie rod 10 is pulled in advance in the axial direction with a predetermined tensile force. Thereby, the tie rod 10 extends by a predetermined length. With the tie rod 10 pulled, the fixing nut 11 is screwed into the tie rod 10. Then, the tensile force is released, whereby the rotating shaft 9 is fixed to the housing 5. As a result, the roll 2 is positioned and fixed at a predetermined position of the housing 5, and the gap 6 is formed.

JP 2000-94016 A

  The roll 2 is positioned as described above, but the position of the roll 2 relative to the housing 5 is not determined by directly operating the roll 2. That is, the position of the roll 2 is determined as a result of determining the mounting position of the hub 7 with respect to the rotating shaft 9 and the mounting position of the rotating shaft 9 with respect to the housing 5.

  Further, the dimension of the gap 6 is very small compared to the dimensions of the roll 2 and the rotating shaft 9 (size of the outer shape). For this reason, when the roll 2 and the rotary shaft 9 are incorporated in the housing 5, the dimension of the gap 6 may not exactly match the dimension designed in advance. Moreover, as described above, since the positioning of the roll 2 is not performed by directly operating the roll 2, the dimension of the gap 6 is more than the dimension of the rotary shaft 9 designed in advance. Tend to produce.

  Furthermore, when the rolling mill 1 is used for a long period of time, the position of the hub 7 with respect to the rotating shaft 9 may change due to wear of the hub 7 or the like. Even in such a case, the dimension of the gap 6 causes an error with respect to the dimension for which the rotary shaft 9 is designed in advance.

  When the dimension of the gap 6 does not exactly match the dimension designed in advance, the wire rod or the like is not rolled to the dimension designed in advance, so that the once-rolled rolling mill 1 is disassembled and reassembled. There is a need. Such work is not only very troublesome, but also has the problem of reducing the productivity of rolling lines such as wire rods.

  Therefore, an object of the present invention is to provide a roll rolling machine that can accurately position the roll at a predetermined position.

  (1) In order to achieve the above object, the roll mill according to the present application is disposed in the casing, a plurality of rolling rolls disposed in the casing such that the outer peripheral surfaces face each other, and the casing, A driving shaft to which one of the plurality of rolling rolls is mounted, a driven shaft that is disposed in the casing and to which another rolling roll is mounted, and the other rolling roll is driven by following one rolling roll. A driven mechanism, a tie rod that is provided in the casing and passes through the drive shaft and the driven shaft in the axial direction, and positions the drive shaft and the driven shaft with respect to the casing, and the relative relationship between the drive shaft and the driven shaft with respect to the tie rod. A position adjusting member for changing the position along the axial direction of the tie rod is provided.

  According to this configuration, one of the plurality of rolling rolls is mounted on the drive shaft and arranged in the casing. The other rolling rolls are mounted on the driven shaft and are disposed in the casing. When a plurality of other rolling rolls are provided, the other rolling rolls are mounted on different driven shafts. Since the one rolling roll and the other rolling roll are arranged so that the outer peripheral surfaces thereof face each other, the rolling center portion where the wire rod or the steel bar is rolled is defined by the outer peripheral surface of each rolling roll. One rolling roll is driven by driving the drive shaft, and the other rolling roll is driven by being driven by the one rolling roll by a driven mechanism. Thereby, the said wire etc. are rolled, being fed to the said rolling center part.

  The drive shaft is fixed by a tie rod. That is, when the drive shaft is inserted into the casing, the tie rod penetrates the drive shaft in the axial direction. The tie rod is pulled in the axial direction in advance, and after the lock nut or the like is screwed into the tie rod in this state, the tensile force is released. As a result, the drive shaft is fixed to the casing while being tightened by the tie rod. The driven shaft is fixed in the same manner as the driving shaft is fixed.

  When the drive shaft is fixed to the casing in this way, the position of the one rolling roll relative to the casing is also determined, but the position of the one rolling roll deviates from a predetermined position designed in advance (the center of the rolling roll is A case of deviating from the rolling center) is also conceivable. In that case, the relative position of the drive shaft with respect to the tie rod is changed by the position adjusting member, and one rolling roll is accurately positioned at a predetermined position designed in advance.

  Further, the relative position of the driven shaft with respect to the tie rod is also changed by the position adjusting member for the rolling roll mounted on the driven shaft. Therefore, the rolling roll mounted on the driven shaft is accurately positioned at a predetermined position designed in advance.

  The position adjusting member is preferably constituted by a cylindrical screw shaft that is screwed into the end surfaces of the drive shaft and the driven shaft, and is provided in the drive shaft and the driven shaft from the respective end surfaces so as to freely advance and retract. . In this configuration, since the cylindrical screw shaft is screwed to the drive shaft or the driven shaft, the cylindrical screw shaft is rotated around the axial direction, so that the drive shaft and the driven shaft with respect to the tie rod can be very simply and reliably. The relative position is changed.

  (2) In order to achieve the above object, the three-roll rolling mill according to the present application includes a casing, three rolling rolls arranged radially in the casing so that the outer peripheral surfaces face each other, and the casing A drive shaft that is disposed and mounted with one rolling roll, two driven shafts that are disposed in the casing and that are each mounted with another rolling roll, and that the other rolling roll is driven following the one rolling roll A driven mechanism that is provided in the casing, passes through the drive shaft and each driven shaft in the axial direction, and positions the drive shaft and each driven shaft with respect to the casing, the drive shaft for each tie rod, Three position adjusting members for changing the relative position of each driven shaft along the axial direction of each tie rod are provided.

  According to this configuration, one rolling roll is mounted on the drive shaft and disposed in the casing. The other two rolling rolls are each mounted on a driven shaft and disposed in the casing. Since these three rolling rolls are radially arranged so that the outer peripheral surfaces thereof are opposed to each other, a rolling center portion where the wire rod or the steel bar is rolled is defined by the outer peripheral surfaces of the respective rolling rolls. One rolling roll is driven by driving the drive shaft, and the other rolling roll is driven by being driven by the one rolling roll by a driven mechanism. Thereby, the said wire etc. are rolled, being fed to the said rolling center part.

  The drive shaft is fixed by a tie rod. That is, when the drive shaft is inserted into the casing, the tie rod penetrates the drive shaft in the axial direction. The tie rod is pulled in the axial direction in advance, and after the lock nut or the like is screwed into the tie rod in this state, the tensile force is released. As a result, the drive shaft is fixed to the casing while being tightened by the tie rod. The driven shaft is fixed in the same manner as the driving shaft is fixed.

  When the drive shaft is fixed to the casing in this way, the position of the one rolling roll relative to the casing is also determined, but the position of the one rolling roll deviates from a predetermined position designed in advance (the center of the rolling roll is A case of deviating from the rolling center) is also conceivable. In that case, the relative position of the drive shaft with respect to the tie rod is changed by the position adjusting member, and one rolling roll is accurately positioned at a predetermined position designed in advance.

  Also, with respect to the rolling rolls mounted on the driven shafts, the relative position of the driven shafts with respect to the tie rods is changed by the position adjusting member, and the other two rolling rolls are accurately placed at predetermined positions designed in advance. Positioned.

  The position adjusting member is constituted by a cylindrical screw shaft that is screwed into end faces of the drive shaft and each driven shaft, and is provided so as to be able to advance and retract from the end surfaces into the drive shaft and each driven shaft. Is preferred. In this configuration, since the cylindrical screw shaft is screwed to the drive shaft or the driven shaft, the drive shaft and each driven shaft for the tie rod are very easily and reliably rotated by rotating the cylindrical screw shaft around the axial direction. The relative position of is changed.

  As described above, according to the present invention, even if each rolling roll is displaced from a predetermined position due to so-called assembly error or secular change, each rolling is performed by the position adjusting member. Since the roll position is adjusted, each rolling roll is always arranged at a predetermined position. In addition, unlike the prior art, it is not necessary to disassemble the entire rolling mill for adjusting the position of each rolling roll, and the operation for adjusting the position of the rolling roll is performed easily and quickly.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 is a cross-sectional view of a three-roll rolling mill (hereinafter simply referred to as “rolling mill”) according to an embodiment of the present invention.

  The rolling mill 20 includes a casing 21, three rolling rolls 22 to 24 that are positioned in the casing 21, a drive shaft 25 that supports and rotates the rolling roll 22, and rolling rolls 23 and 24. The driven shafts 26 and 27 that respectively support the drive shaft 25, the driven mechanism 28 that rotates the driven shafts 26 and 27 as the drive shaft 25 rotates, and the drive shaft 25 and the driven shafts 26 and 27 are positioned with respect to the casing 21. Tie rods 29 (the tie rods for the driven shafts 26 and 27 are not shown), and screw shafts (position adjusting members) for changing the positions of the drive shaft 25 and the driven shafts 26 and 27 with respect to the tie rod 29. 30).

  The casing 21 is formed of cast steel or the like, for example, and roll holding portions 31 to 33 are formed inside. The roll holding portions 31 to 33 accommodate the rolling rolls 22 to 24, and are arranged radially in three directions inside the casing 21, as shown in the figure. That is, each roll holding | maintenance part 31-33 is arrange | positioned so that it may mutually cross at an angle of 120 degrees.

  The rolling roll 22 is formed in a disk shape and includes a roll body 34 and a hub 35.

  The hub 35 is composed of, for example, an SCM 440 or the like, and the drive shaft 25 is penetrated through the central portion thereof as will be described later. The roll body 34 is made of, for example, a ductile and is formed in a ring shape.

  The roll body 34 is fitted on the outer peripheral surface of the hub 35. The roll body 34 is fixed to the hub 35 by, for example, an oil injection method. For this reason, an oil introduction path 36 is formed in the hub 35.

  Moreover, the outer peripheral surface part of the roll main body 34 is formed in a triangular shape so as to protrude radially outward as shown in the figure, and a groove 37 is provided on the top part thereof. The inner wall surface shape of the groove 37 is formed in an arc shape.

  Since the rolling roll 23 and the rolling roll 24 are the same structure as the rolling roll 22, the description is abbreviate | omitted.

  As shown in the figure, the drive shaft 25 is formed in a stepped rod shape, and is driven to rotate by a required drive device (not shown). The drive shaft 25 is arranged in the casing 21. That is, the drive shaft 25 is inserted from the left side of the casing 21 in the figure, and is rotatably supported by the drive shaft support portion 38 and the drive shaft support portion 39 formed in the casing 21.

  A through hole 55 is provided in the center of the drive shaft 25 along the axial direction. As will be described later, the tie rod 29 is inserted into the through hole 55. A recess 57 is formed in the left end surface 56 of the drive shaft 25. This recessed part 57 comprises the seat part of the clamping nut 58 explained in full detail behind.

  The drive shaft support portion 38 includes a bearing 40, and the left portion of the drive shaft 25 is supported by the bearing 40. The drive shaft support portion 39 includes the tie rod 29 and an end plate 42. The tie rod 29 is a round bar-like member, the right end portion 43 is formed in a flat plate shape, and the left end portion 59 is formed with a male screw. The fastening nut 58 is screwed to the left end portion 59. The right end portion 43 of the tie rod 29 is fixed to the casing 21, and the tie rod 29 extends to the left as shown in FIG.

  The end plate 42 is formed in a substantially cylindrical shape and is inserted through the tie rod 29. The end plate 42 defines the position of the right end surface of the drive shaft 25 as will be described in detail later. The end plate 42 is rotatably supported by a bearing 41.

  FIG. 2 is an enlarged cross-sectional view of the main part of the drive shaft 25 and shows the structure of the drive shaft 25 and the drive shaft support portion 39 in detail.

  The screw shaft 30 is attached to the right end surface of the drive shaft 25. The screw shaft 30 is made of, for example, S45C and is formed in a cylindrical shape. A male screw 44 is formed on the outer peripheral surface of the screw shaft 30, and a screw hole 46 in which a female screw is formed is provided on the right end surface 45 of the drive shaft 25. The screw shaft 30 is attached to the drive shaft 25 by screwing the screw shaft 30 into the screw hole 46. Therefore, when the screw shaft 30 is rotated, the screw shaft 30 can advance and retreat with respect to the right end surface 45 of the drive shaft 25. In the figure, the screw shaft 30 protrudes from the right end surface 45 of the drive shaft 25 by a distance d.

  Since the rolling rolls 23 and 24 are the same structure as the said rolling roll 21, the description is abbreviate | omitted. The rolling rolls 23 and 24 are supported by the driven shaft 26 and the driven shaft 27, respectively, and are accommodated in the roll holding portions 32 and 33. These driven shafts 27 are supported on the casing 21 by bearings (not shown), so that the rolling rolls 22 and 23 are rotatable about the driven shafts 26 and 27.

  Each driven shaft 26, 27 is driven by the driven mechanism 28. The driven mechanism 28 includes two pairs of bevel gears 47-50. The bevel gears 47 and 49 are supported by the roll holding part 31 of the casing 21 via bearings 51 and 52 and are fixed to the drive shaft 25. The bevel gears 48 and 50 are supported by the roll holding portions 32 and 33 via bearings, respectively. The bevel gear 48 is fixed to the driven shaft 26, and the bevel gear 50 is fixed to the driven shaft 27.

  The bevel gear 47 is engaged with the bevel gear 48, and the bevel gear 49 is engaged with the bevel gear 50. Therefore, when the drive shaft 25 is rotated, the bevel gears 47 and 49 are rotated, and at the same time, the bevel gears 48 and 50 are rotated. Thereby, when the drive shaft 25 rotates, the driven shafts 26 and 27 rotate, and the rolling rolls 22 to 24 rotate.

  As described above, since the grooves 37 are provided in each of the rolling rolls 22 to 24, in the state where the respective rolling rolls 22 to 24 are opposed to each other as shown in FIG. Each groove 37 faces radially from three directions. And the rolling center 53 is comprised by each groove | channel 37 facing. Since the inner wall surface shape of each groove 37 is formed in an arc shape, a substantially circular rolling center 53 is formed.

  The wire used as the material is fed to this rolling center. By rotating each of the rolling rolls 22 to 24, a bar having a predetermined outer diameter is rolled.

  Next, the procedure for assembling the rolling rolls 22 to 24 to the casing 21 will be described.

  The roll body 34 of the rolling roll 22 is attached to the hub 35 in advance as described above. The rolling roll 22 is inserted into the roll accommodating portion 31, and the drive shaft 25 is inserted into the casing 21 in this state. Thereby, the drive shaft 25 penetrates the rolling roll 22. The rolling roll 22 is fixed to the drive shaft 25 by, for example, an oil injection method. For this reason, an oil introduction path 54 is formed in the hub 35.

  Since the tie rod 29 is provided in the casing 21, when the drive shaft 25 is inserted into the casing 21 as described above, the tie rod 29 is inserted through the through hole 55 of the drive shaft 25. As a result, the right end of the tie rod 29 abuts against the end plate 42, and the left end portion 59 of the tie rod 29 protrudes from the left end surface 56 of the drive shaft 25. At this time, since the screw shaft 44 protrudes from the right end surface 45 of the tie rod 29 by a distance d, the screw shaft 44 contacts the end plate 42.

  Further, the tie rod 29 is pulled leftward in the drawing by a required tensile force, and is extended by a predetermined dimension. In order to pull the tie rod 29, a known device such as a hydraulic device is employed. In this state, the tightening nut 58 is screwed into the tie rod 29, and the tightening nut 58 is tightened in the recess 57. When the tightening nut 58 is tightened with a predetermined tightening torque, the tensile force is released. As a result, the tie rod 29 tends to contract in the axial direction, so that the drive shaft 25 is firmly positioned and fixed to the casing 21. The rolling rolls 23 and 24 are also positioned and fixed in the casing 21 in the same manner as the rolling roll 22.

  By the way, when each rolling roll 22-24 is positioned in the above-mentioned way, each rolling roll 22-24 may not be arrange | positioned in the position designed beforehand. That is, when the rolling rolls 22 to 24 are positioned and the grooves 37 of the rolling rolls 22 to 24 are arranged to face each other, the rolling center 53 may not accurately exhibit a circular shape, and as a result, designed in advance. The bar is not rolled with high accuracy.

  In the present embodiment, as shown in FIG. 2, the screw shaft 30 is provided on the drive shaft 25 and the driven shafts 26 and 27, and thus the end surfaces of the drive shaft 25 and the driven shafts 26 and 27 ( That is, the position of the right end surface of the screw shaft 30 changes. Therefore, even if each rolling roll 22-24 has shifted from the position designed beforehand, the position of drive shaft 25 and driven shafts 26 and 27 changes by this screw shaft 30 rotating appropriately. As a result, each of the rolling rolls 22 to 24 is accurately arranged at a predesigned position. Specifically, once the tightening nut 58 is loosened and the screw shaft 30 is rotated, the positions of the rolling rolls 22 to 24 are easily changed.

  As described above, in the present embodiment, by providing the screw shaft 30, the positions of the drive shaft 25 and the driven shafts 26 and 27 with respect to the tie rod 29 are changed. As a result, the respective rolling rolls 22 to 24 are designed in advance. Since it is precisely arranged at the position, it is not necessary to disassemble the drive shaft 25, the driven shaft 26, and the rolling rolls 22-24 once for the positioning of the respective rolling rolls 22-24, as in the prior art. Simple and quick work is realized.

  In particular, in this embodiment, the screw shaft 30 is employed to adjust the positions of the drive shaft 25 and the driven shafts 26 and 27, and the member for adjusting the position of the drive shaft 25 and the like has a very simple structure. is there. Therefore, there exists an advantage that the manufacturing cost as the whole rolling mill 20 does not rise significantly.

  However, the member for adjusting the position of the drive shaft 25 or the like is not limited to the screw shaft 30, and other various spacers or a mechanism for directly extending or contracting the drive shaft 25 or the like may be employed. .

  This embodiment discloses an embodiment in which the present invention is applied to a three-roll rolling mill provided with rolling rolls 22-24. However, the present invention is not only applied to such a three-roll rolling mill, but of course can be similarly applied to a four-roll rolling mill as well as a two-roll rolling mill and a multi-roll rolling mill.

  Also in that case, each rolling roll is arrange | positioned in a casing similarly to the rolling rolls 22-24 which concern on this embodiment, and one rolling roll is supported by the drive shaft among several rolling rolls, and other rolling rolls Is supported by the driven shaft. The driven shaft is driven by a mechanism similar to the driven mechanism 28, and the positions of the drive shaft and the driven shaft can be adjusted by the screw shaft 30.

  The present invention can be applied to a roll rolling mill provided with a rolling roll.

FIG. 1 is a cross-sectional view of a three-roll rolling mill according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of a drive shaft of a three-roll rolling mill according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing the structure of a conventional three-roll rolling mill.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Rolling mill 21 ... Casing 22 ... Rolling roll 23 ... Rolling roll 24 ... Rolling roll 25 ... Drive shaft 26 ... Drive shaft 27 ... Drive shaft 28 ... -Drive mechanism 29 ... Tie rod 30 ... Screw shaft 34 ... Roll body 35 ... Hub 37 ... Groove 42 ... End plate 43 ... Right end portion 45 ... Right end surface 48- ..Bevel gear 47 ... Bevel gear 49 ... Bevel gear 50 ... Bevel gear 53 ... Rolling center 55 ... Through hole 56 ... Left end surface 57 ... Concave 58 ... Tightening nut 59 ..Left end

Claims (4)

A casing,
A plurality of rolling rolls arranged in the casing such that the outer peripheral surfaces face each other;
A drive shaft disposed in the casing and mounted with one of the plurality of rolling rolls;
A driven shaft that is placed in the casing and on which other rolling rolls are mounted;
A driven mechanism driven by one rolling roll to drive another rolling roll;
A tie rod that is provided in the casing and penetrates the drive shaft and the driven shaft in the axial direction to position the drive shaft and the driven shaft with respect to the casing;
A roll rolling mill provided with a position adjusting member that changes the relative positions of the drive shaft and the driven shaft with respect to the tie rod along the axial direction of the tie rod. A casing,
Three rolling rolls arranged radially in the casing so that the outer peripheral surfaces face each other;
A drive shaft disposed in the casing and mounted with one rolling roll;
Two driven shafts which are arranged in the casing and on which other rolling rolls are respectively mounted;
A driven mechanism driven by one rolling roll to drive another rolling roll;
Three tie rods provided in the casing and respectively passing through the drive shaft and each driven shaft in the axial direction to position the drive shaft and each driven shaft with respect to the casing;
A three-roll rolling mill provided with three position adjusting members that change the relative positions of the drive shaft and the driven shaft with respect to each tie rod along the axial direction of each tie rod. The position adjusting member is
The roll rolling mill according to claim 1, comprising a cylindrical screw shaft that is screwed into end faces of the drive shaft and the driven shaft, and is provided so as to be able to advance and retract from the end surfaces to the inside of the drive shaft and the driven shaft. The position adjusting member is
The three-roll rolling according to claim 2, comprising a cylindrical screw shaft that is screwed into end faces of the drive shaft and each driven shaft, and is provided in the drive shaft and each driven shaft from the end surfaces so as to freely advance and retract. Machine.

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