Pilger rolling mill raw tube material control mechanism and raw tube material control method

Abstract

To realize an improvement in production efficiency by saving the weight of a device to enable the high-speed operation of the device.SOLUTION: A pilger mill comprises: a movable base 5a movable along a shaft member 9; a dispersion chuck 51 making an element pipe material S face a milling area to grip it to enable axial rotation; feed drive motors 641, 642, advancing or retreating the movable base 5a by obtaining a reaction force from the shaft member 9 on rotation drive; a twisting drive motor 643 axially rotating the element pipe material S gripped by the dispersion chuck 51; and feed drive means installed on the movable base 5a to rotationally drive the shaft member 9. The twisting drive motor 643 has an annular twisting timing belt 654 transmitting rotational power to the dispersion chuck 51 connected thereto and axially rotates the element pipe material S gripped by the dispersion chuck 51.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a blank material control mechanism and a blank material control method for a piercer rolling mill that feeds a metal material made of a metal pipe material or a solid bar material toward a rolling area formed by rolling rolls such as a cold piercer and rolls the metal material in the rolling area.

Background Art

[0002] In recent years, in the automotive field, next-generation energy field, and existing energy field, etc., for fuel efficiency improvement in various devices of automobiles such as fuel injection pipes, hydrogen station facilities, and various facilities such as oil and gas plants, the demand for seamless pipes processed from high-functional materials such as special steel, stainless steel, nickel alloy, and titanium has been increasing from the viewpoints of pressure resistance, corrosion resistance, heat resistance, and high precision.

[0003] Such seamless pipes are manufactured by rolling a metal material made of a metal pipe material or a solid bar material. Specifically, as the manufacture of seamless pipes, a cold rolling method using a cold piercer mill that rolls using a pair of upper and lower rolling rolls is known (for example, Patent Document 1). In the technology disclosed in this Patent Document 1, a pair of pass rolls having a pass pattern formed on the peripheral surface is used, and a mandrel having a taper whose diameter decreases toward the tip is provided between the pass rolls. This pass roll is supported by a roll stand with a rotating shaft provided at its axis. And when performing cold rolling on the pipe material, the pass roll supported by the roll stand reciprocates along the mandrel, thereby rolling the pipe material, which is the workpiece, while reciprocally rotating.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in conventional rolling mills such as the one disclosed in Patent Document 1, the power generating device that drives the base portion on which the mechanism for gripping the metal material is mounted toward the die roll is located outside the device, and the mechanism rotates the shaft member from an external position. Therefore, depending on the length of the shaft member from the power generating device to the base portion, the shaft member may bend, requiring a high output from the power generating device to rotate the shaft member.

[0006] In other words, the reduction in the size of the shaft member increased the torque and load generated at the point where it is screwed onto the base, requiring an increase in the diameter and strength of the shaft member to withstand this. Consequently, the power generation device had to be made larger and more powerful, resulting in an overall increase in the size of the rolling equipment, which increased installation costs, as well as increased energy consumption and higher operating costs.

[0007] Furthermore, while there is a growing demand for increased production efficiency in recent years, as the size of each component of the equipment, such as the mechanism for feeding metal materials and the mechanism for twisting and rotating them, increases, the inertia (moment of inertia) during operation also increases. To control this, the equipment tends to become even heavier, and there is a certain limit to how fast the operating speed of the mechanism for feeding metal materials can be increased.

[0008] Therefore, the present invention aims to solve the above-mentioned problems and to provide a raw material control mechanism and raw material control method for a pilger rolling mill that can reduce the weight of the equipment and enable high-speed operation of the equipment, thereby improving production efficiency when feeding metal materials such as metal tube materials or solid rod materials into the rolling area and rolling them, such as in a cold pilger. [Means for solving the problem]

[0009] To solve the above problems, Book The invention is, A raw tube material control mechanism for a Pilger rolling mill, which feeds a raw tube material made of metal tubular material or solid rod material toward a rolling region formed by rolling rolls, and rolls the raw tube material within the rolling region while gripping it in a hole mold having a recess that is pressed against the outer circumference of the raw tube material, A rod-shaped shaft member extending along the direction in which the raw pipe material is fed out, Movable along the shaft member Mobile base and, The aforementioned Mobile base Above, the raw pipe material is gripped so as to be rotatable on an axis, facing the rolling region. Distributed chuck and, The aforementioned Mobile base Above the shaft member Screw And, obtaining a reaction force from the shaft member, Mobile base The shaft member is moved back and forth along the shaft member. Threaded section and, The aforementioned Mobile base In the above, Distributed chuck A twisting drive means for rotating the aforementioned pipe material that is gripped by the twisting drive means, The aforementioned shaft component A driving means for rotating and 、 A rod-shaped transmission shaft extends along the direction in which the raw pipe material is fed out and is rotated on its axis by a twisting power source. Equipped with, The torsional drive means includes a torsional power source that outputs rotational power, and the rotational power Distributed chuck It comprises an annular belt member that transmits to, Multiple distribution chucks are arranged along the transmission axis, The belt member is provided for each of the plurality of distributed chucks and transmits rotational power due to the axial rotation of the transmission shaft to each distributed chuck. The rotational power transmitted via the belt member, Distributed chuck The tubular material being gripped is rotated on an axis ru It is characterized by the following:

[0010] Also, Book The invention is, A method for controlling raw tube material in a Pilger rolling mill, wherein raw tube material made of metal tubular material or solid rod material is fed toward a rolling region formed by rolling rolls, and the raw tube material is rolled within the rolling region while being gripped by a hole mold having a recess that is pressed against the outer circumference of the raw tube material, Movable along a rod-shaped shaft member extending along the feeding direction of the raw pipe material Mobile base In this case, the raw pipe material Distributed chuck is made to face the rolling region and is gripped so as to be rotatable about the axis; The Mobile base In this case The shaft member into which the threaded portion is threaded. is rotationally driven by the feeding drive means to obtain a reaction force from the shaft member, and the Mobile base is advanced and retracted along the shaft member, and in this case Mobile base In this case Distributed chuck the raw pipe material gripped by the is included, The aforementioned distributed chucks are arranged in multiple locations along a rod-shaped transmission shaft that extends in the direction of feeding the raw pipe material and is rotated axially by a twisting power source. The twisting drive means includes a twisting power source that outputs rotational power, and an annular belt member that transmits the rotational power to the Distributed chuck ; The belt member is provided for each of the plurality of distributed chucks and transmits rotational power due to the axial rotation of the transmission shaft to each distributed chuck. By the power transmitted through the belt member, the raw pipe material gripped by the<a000095>is rotated about the axis This is the gist.

[0012] In the above invention, it has an insertion portion through which the transmission shaft is inserted to match the cross-sectional shape of the transmission shaft, and a sliding pulley that is slidable in the feeding direction with respect to the transmission shaft, and an annular power source side belt member that transmits the rotational power of the twisting power source to the sliding pulley is further provided, The twisting power source is installed outside the Mobile base ; The cross-section of the transmission shaft is polygonal, The belt member Mobile base is advanced and retracted together with the The sliding pulley slides on the transmission shaft as the twisting power source advances and retracts, and transmits the rotational power through the power source side belt member This is preferably the gist.

[0013] In the above invention The feeding drive means The aforementioned Mobile base A power source installed outside that outputs rotational power, The annular belt member that transmits the rotational power and Equipped with, The power transmitted via the belt member rotates the shaft member. thing It is preferable.

[0014] Also, In the above invention, the shaft member is divided into a front and a rear section of the drive mechanism, and it is preferable that these divided front and rear shaft members are independently rotationally driven.

[0015] In the above invention, The shaft member has a threaded portion engraved on it along the feeding direction, The forward / backward drive unit has a threaded portion that is screwed onto the threaded portion of the shaft member, and moves forward and backward by obtaining a reaction force from the shaft member by rotating the threaded portion. It is preferable. [Effects of the Invention]

[0016] As described above, according to this invention, the material gripping part and the forward / backward drive part are arranged on a base that can move along the shaft member, and these drive means are also installed on the base, so the distance between the parts that engage with the shaft member and the metal material and their power sources can be made short and constant. As a result, according to this embodiment, when feeding metal materials such as metal tube material or solid rod material into the rolling area for rolling, such as in a cold pilger, the weight of the equipment can be reduced, and the equipment can be operated at high speed, thereby improving production efficiency. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic diagram showing the entire rolling mill according to the embodiment, where Figure (a) is a top view of the rolling mill and Figure (b) is a side view of the rolling mill. [Figure 2] This is a top view of the structure of the transport unit according to the embodiment. [Figure 3] This is a right side view of the structure of the transport unit according to the embodiment. [Figure 4]This is a left side view of the structure of the transport unit according to the embodiment. [Figure 5] This is a front view of the structure of the transport unit according to the embodiment. [Figure 6] This is a rear view of the structure of the transport unit according to the embodiment. [Figure 7] This is a perspective view of the structure of the transport unit according to the embodiment, viewed from the front. [Figure 8] This is a perspective view of the structure of the transport unit according to the embodiment, viewed from the rear side. [Figure 9] This is a perspective view showing only the drive mechanism in the transport section according to the embodiment. [Figure 10] This is a perspective view showing the delivery chuck according to the embodiment. [Figure 11] This is a perspective view showing the delivery chuck according to the embodiment. [Modes for carrying out the invention]

[0018] (Overall configuration of the rolling mill) An embodiment of the Pilger rolling mill 100 according to the present invention will be described in detail below with reference to the attached drawings. Figure 1 is a schematic diagram showing the entire Pilger rolling mill 100 according to the embodiment, where Figure 1(a) is a top view of the Pilger rolling mill 100 and Figure 1(b) is a side view of the Pilger rolling mill 100. In this embodiment, the case of rolling a cylindrical tube material is used as an example, but the present invention is not limited thereto and can also be applied to, for example, a solid metal rod material that does not have an internal space.

[0019] The embodiments described below are illustrative examples of devices and the like for realizing the technical concept of this invention, and the technical concept of this invention does not limit the materials, shapes, structures, arrangements, etc. of each component to those described below. The technical concept of this invention can be modified in various ways within the scope of the claims.

[0020] As shown in Figures 1(a) and (b), the Pilger rolling mill 100 is a rolling mill that feeds a raw metal pipe material S toward a rolling region formed by rolling rolls 1,1 and rolls the metal material within the rolling region. Specifically, the Pilger rolling mill 100 comprises a roll stand 2 into which a pair of upper and lower rolling rolls 1,1 are incorporated, a main drive unit 3 that reciprocates the roll stand 2, a mandrel 4 with a tapered tip, a transport unit 6 and a moving chuck unit 5 that intermittently feed out a predetermined amount of the raw metal pipe material S while holding it and rotating the raw metal pipe material S by a predetermined amount on the axis, and an exit gripping unit 8 that grips the finished product pipe P after rolling.

[0021] The pair of rolling rolls 1, 1 incorporated into the roll stand 2 are arranged vertically, and the area between the vertically positioned rolling rolls 1, 1 constitutes the rolling region. Although not shown in the diagram, the pinions attached to the shaft ends of each rolling roll 1, 1 are meshed with racks fixed to the stand frame, and rotate in both forward and reverse directions as the roll stand 2 moves back and forth.

[0022] The outer surface of the rolling roll 1 has holes (recesses) 1a formed thereon, the radius of curvature of which is progressively smaller in the circumferential direction. The raw pipe material S is rolled while being gripped by these holes 1a. These holes 1a have recesses that are pressed against the outer surface of the raw pipe material S, and the recesses of these holes 1a and the tapered portion of the mandrel 4 reduce the outer diameter and wall thickness of the raw pipe material S during rolling. An idle section is interposed in the holes 1a. The idle section is the section in which the raw pipe material S is fed out and rotated by the conveying section 6.

[0023] The main drive unit 3 is a driving means for moving the roll stand 2 back and forth, and is provided on both sides of the main drive unit 3 and comprises rotating bodies 31, 31 that rotate about a central axis by a motor (not shown), and thrust rods 32 that are connected to each rotating body 31 and the roll stand 2 and transmit the rotational force of the rotating bodies 31 to the roll stand 2. When these rotating bodies 31, 31 rotate, the thrust rods convert the rotational force of the rotating bodies 31, 31 into thrust force and transmit it to the roll stand 2, causing the roll stand 2 to reciprocate in the direction of the arrow.

[0024] The mandrel 4 is a rod-shaped member with a circular cross-section that is inserted into the interior of the raw pipe material S, and is designed to provide a reaction force from inside the raw pipe material S against the external pressure applied to the raw pipe material S by the rolling rolls 1, 1. The mandrel 4 is attached to the end of the mandrel support pipe 41 that supports the mandrel 4, and the mandrel support pipe 41 is held by a plurality of movable chuck parts 5. The conveying part 6 can be opened and closed by a cylinder (not shown), and normally grips the mandrel support pipe 41 and fixes the mandrel 4 so that it does not move in the axial direction.

[0025] Between the shaft holding portion 69 and the roll stand 2, a pair of shaft members 9 are positioned, extending in the direction of the feed-out of the raw pipe material S. The shaft members 9 are rod-shaped screw members whose ends are rotatably supported by the shaft holding portion 69 and the roll stand 2. Male threads are engraved on the outer surface of the shaft members 9, and screw-fitting portions 92 are screwed into these male threads at each movable chuck portion 5. As a result, when the shaft members 9 are rotated on their axis, each screw-fitting portion 92 is connected so as to be movable toward the rolling area.

[0026] A transmission shaft 50, having a hexagonal cross-section, is laid parallel to the shaft member 9. This transmission shaft 50 is a rod-shaped member that extends along the feeding direction of the raw pipe material S and is rotated on its axis by a twisting drive motor 643, which is a twisting power source. A pulley 91 is fitted onto the transmission section 6, and the shaft is rotated by the twisting drive motor 643 via a timing belt 653 on the power source side. In addition, sliding pulleys 94 are slidably fitted onto the transmission shaft 50 at each movable chuck section 5. The sliding pulley 94 has an insertion portion 94a that matches the cross-sectional shape of the transmission shaft 50 and through which the transmission shaft 50 is inserted, and is a member that can slide in the feeding direction relative to the transmission shaft 50 inserted through this insertion portion 94a.

[0027] More specifically, the pulley 91 transmits rotational power from the torsion drive motor 643 via the power source side timing belt 653 on the base portion 62 of the conveying section 6. In this embodiment, the transmission shaft 50 has a hexagonal cross-section, and the cross-section of the insertion portion 91a is also hexagonal. As a result, the connecting portion 91 transmits rotational power via the power source side timing belt 653. The transmission shaft 50 passes through the support wall 622, and the connecting portion 91 is pivotally supported on the wall surface of the support wall 622.

[0028] Meanwhile, on the movable base 5a of the movable chuck section 5, the sliding pulley 94 transmits rotational power from the transmission shaft 50 via the twisting timing belt 654. In this embodiment, the transmission shaft 50 has a hexagonal cross-section, and the cross-section of the insertion portion 94a is also hexagonal. As a result, the sliding pulley 94 slides in the axial direction of the transmission shaft 50 but not in the circumferential direction. Consequently, the sliding pulley 94 slides on the transmission shaft 50 as the movable base 5a moves back and forth, transmitting rotational power to the chucks 511 and 512 on the movable chuck section 5 via the twisting timing belt 654. The transmission shaft 50 passes through the support wall 622 and is pivotally supported together with the sliding pulley 94 on the wall surface of the support wall 522.

[0029] The conveying unit 6 holds the raw pipe material S midway and, using a drive source installed inside the conveying unit 6, intermittently twists the raw pipe material S at predetermined timings while feeding it out for a certain length. The conveying unit 6 is equipped with conveying drive motors 641 and 642 on the base unit 62, which serve as power sources for the conveying drive means that rotate the shaft member 9 axially. These conveying drive motors 641 and 642 rotate the shaft member 9, and the rotational force is transmitted via the shaft member 9 to the threaded portion 92 of each movable chuck unit 5, causing the movable base 5a of each chuck 512 to move forward and backward.

[0030] Furthermore, the conveying unit 6 is equipped with a twist drive motor 643 on the base unit 62, which serves as a power source for a twist drive means that rotates the transmission shaft 50. The transmission shaft 50 is rotated by this twist drive motor 643, and the rotational force is transmitted via the transmission shaft 50 to the distributed chucks 51 of each movable chuck unit 5, causing the raw pipe material S to rotate intermittently.

[0031] The movable chuck section 5 is a drive mechanism that holds the raw pipe material S and, via the shaft member 9 and the transmission shaft 50, twists the raw pipe material S at predetermined timings while feeding it out by a certain length using a drive source installed on the transport section 6 side, and is capable of moving forward and backward along the feeding direction of the raw pipe material S. In this transport section 6, the transmission shaft 50 is rotationally driven by a twisting drive motor 643, which is the power source for the twisting drive means that rotates the transmission shaft 50 provided on the transport section 6 side, and this rotational force is transmitted to the distributed chucks 51 of each movable chuck section 5 on the movable base 5a, causing the raw pipe material S to rotate intermittently. This intermittent rotation of the raw pipe material S causes the outer circumference of the raw pipe material S to be uniformly reduced in size by rolling.

[0032] The exit gripping section 8 is openable and closable by a cylinder (not shown), and under normal circumstances, it grips the raw pipe material S and the product pipe P in a state where sliding in the axial direction is permitted but sliding in the circumferential direction is not possible, and rotates together with the product pipe P. In addition, a liquid (oil) at a pressure that provides a gripping force predetermined based on the pipe dimensions (outer diameter and wall thickness) and material is supplied to the cylinder of the exit gripping section 8 to prevent deformation of the pipe.

[0033] In the Pilger rolling mill 100 configured as described above, the raw pipe material S is subjected to diameter reduction and wall thinning processing by a pair of upper and lower rolling rolls 1, 1 that rotate in forward and reverse directions during one reciprocating motion of the roll stand 2, and a tapered mandrel 4, thereby forming it into a product pipe P. At this time, the raw pipe material S is fed towards the roll stand 2 by the conveying unit 6 and the movable chuck unit 5 by a fixed length each time the roll stand 2 reciprocates a predetermined number of times. Simultaneously, the raw pipe material S and the mandrel 4 are rotated by a predetermined angle around their axes by the conveying unit 6 and the movable chuck unit 5. The feeding of the raw pipe material S by the conveying unit 6 and the movable chuck unit 5 is usually performed when the raw pipe material S is located in the idle section of the hole molds 1a, 1a of the rolling rolls 1, 1.

[0034] The drive of each of these devices is controlled by a control device (not shown) consisting of a CPU or the like. For example, the amount of raw pipe material S fed out is adjusted by using this control device to synchronize the rotation speed of the drive motor in the conveying section 6 with the rotation of the crankshaft using a sequence control. However, in a Pilger rolling mill where the crankshaft is mechanically connected using a gear mechanism, this may be done by changing the gear ratio of the gear mechanism.

[0035] Furthermore, in this embodiment, each drive motor is provided with a sensor to detect motor torque or current value, and a lower limit value for these motor torque or current values ​​is set. When a sudden decrease in motor load (motor torque) is detected due to a timing belt breakage, the rolling operation in the main drive unit 3 is stopped. In particular, if the feed timing belts 651 and 652 break, the machine will continue to operate, but production will stop, so it is desirable to detect this with the sensor and immediately stop the operation to quickly resume production. Also, if the twisting timing belt 654 breaks, abnormal rolling will occur and the expensive mandrel will be damaged, so it is desirable to detect this immediately and stop the rolling operation to avoid damage to the mandrel and other components.

[0036] (Configuration of the transport unit) Next, the configuration of the transport unit 6 will be described in detail. Figures 2 to 8 show the configuration of the transport unit 6, and Figure 9 shows only the power system provided in the transport unit 6 according to this embodiment. As shown in these figures, the transport unit 6 mainly comprises, on a base unit 62, transport drive motors 641 and 642, connecting parts 411 and 412 that together with the shaft members 9 (9a, 9b) constitute the forward and backward drive unit, and a twisting drive motor 643 which is the power source for the twisting drive means.

[0037] In this embodiment, the drive motors 641, 642, and 643 described above are electric motors that convert electrical energy into mechanical energy and are rotationally driven by power supplied via a power cord or the like (not shown). The transmission drive motors 641 and 642 are drive sources that rotate the connecting parts 411 and 412, which together with the shaft member 9 constitute the forward and backward drive unit, and the twisting drive motor 643 is a drive source that rotates the transmission shaft 50.

[0038] The base portion 62 described above is a fixedly positioned base and consists of a horizontal plate-shaped base 624 and legs 623 that support it. Support walls 621 and 622 are erected vertically on the base 624 of the base portion 62 and perpendicular to the direction of extension of the shaft member 9.

[0039] The torsional drive motor 643 is a torsional power source that constitutes the torsional drive mechanism, and rotates a transmission shaft 50 with a hexagonal cross-section that is inserted through the connection part 91 on the base part 62. The torsional drive motor 643 is fixed to the support wall 622, and its rotation shaft 643a passes through the support wall 622, supporting the pulley 663 on the opposite side of the support wall 622. As a result, the torsional drive motor 643 receives a reaction force from the support wall 622 and rotates the pulley 663.

[0040] On the other hand, the feed drive motor 641 is fixed to the support wall 621, and its rotation shaft 641a passes through the support wall 621, supporting the pulley 661 on the opposite side of the support wall 621. As a result, the feed drive motor 641 receives a reaction force from the support wall 621 and rotates the pulley 661. On the other hand, the drive motor 642 is fixed to the support wall 622, and its rotation shaft 642a passes through the support wall 622, supporting the pulley 662 on the opposite side of the support wall 622. As a result, the drive motor 642 receives a reaction force from the support wall 622 and rotates the pulley 662.

[0041] Furthermore, in this embodiment, the feed drive means includes annular feed timing belts 651 and 652 that are wrapped around pulleys 661 and 662, respectively, connected to feed drive motors 641 and 642. These feed timing belts 651 and 652 are endless (annular) belt members with numerous teeth that engage with teeth formed on the outer circumference of the pulleys. In this embodiment, high-strength general belts are used, which are made of high-strength rubber and have a core wire made of glass fiber or aramid fiber. In addition, it is preferable to use even higher-strength belts specifically designed for low-speed, high-torque ranges, which are made of high-strength urethane, as the feed timing belts 651 and 652.

[0042] The feed timing belts 651 and 652 then move from pulleys 661 and 662 to pulleys 421 and 422 located on the outer circumference of the connecting parts 411 and 412. Rotational power from the feed drive motors 641 and 642 is transmitted from pulleys 661 and 662 to the respective feed timing belts 651 and 652. The power transmitted via the feed timing belts 651 and 652 causes the connecting parts 411 and 412 to rotate axially via pulleys 421 and 422. The connecting parts 411 and 412 are fixed to the shaft member 9, and the rotational drive of the connecting parts 411 and 412 causes the respective front and rear shafts 9a and 9b to rotate axially.

[0043] On the other hand, the twist drive motor 643 is a twist power source that constitutes the twist drive means, and rotates the transmission shaft 50 that constitutes the forward and backward drive unit on the base portion 62. The twist drive motor 643 is fixed to the support wall 622, and its rotation shaft 643a passes through the support wall 622, supporting the pulley 663 on the opposite side of the support wall 622. As a result, the twist drive motor 643 receives a reaction force from the support wall 622 and rotates the pulley 663.

[0044] The connecting parts 411 and 412 that constitute the forward and backward drive unit are engaged with the shaft members 9 (9a, 9b) on the base unit 62 and, by rotational driving, obtain a reaction force from the shaft members 9, thereby causing the base unit 62 to move forward and backward along the shaft members 9. Specifically, the connecting parts 411 and 412 in this embodiment are cylindrical members and are fixed to the shaft members 9 which are inserted through the hollow part inside them. In this embodiment, the shaft member 9 is divided into front and rear shafts 9a and 9b at the front and rear of the transport unit 6, and is fixed to each of the front and rear shafts 9a and 9b, respectively. As a result, the front and rear shafts 9a and 9b are rotationally driven independently by the transport drive motors 641 and 642, respectively.

[0045] In this embodiment, a pulley 663 is connected to the rotating shaft 643a of the torsion drive motor 643, and an annular power source side timing belt 653 is wrapped around this pulley 663. The power source side timing belt 653 is an endless (annular) belt member with numerous teeth that engage with teeth formed on the outer circumference of the pulley. In this embodiment, a high-strength general-purpose belt is used, which is made of high-strength rubber and has a core wire made of glass fiber or aramid fiber. Furthermore, it is preferable to use an even higher-strength belt specifically designed for low-speed, high-torque ranges, which is made of high-strength urethane, as the power source side timing belt 653.

[0046] The feed timing belts 651 and 652 are then routed from pulleys 661 and 662 to pulleys 421 and 422 positioned on the outer circumference of connection parts 411 and 412 screwed onto the shaft member 9, and rotational power from the feed drive motors 641 and 642 is transmitted to the feed timing belts 651 and 652 via pulleys 661 and 662. The power transmitted by these feed timing belts 651 and 652 rotates the connection parts 411 and 412 via pulleys 421 and 422, and the female threads of these connection parts 411 and 412 convert this rotational force into power that moves forward and backward along the shaft member 9.

[0047] (Configuration of the delivery chuck section) Next, the configuration of the movable chuck section 5 will be described in detail. Figures 10 to 11 show the configuration of the movable chuck section 5. As shown in these figures, in this embodiment, the power of the twisting drive motor 643, which is the twisting power source, is supplied as a twisting motion in the plurality of chucks 512 via the transmission shaft 50. The movable chuck section 5 is a drive mechanism in which a plurality of material gripping parts are arranged along the feeding direction of the raw pipe material, and each timing belt is provided in each of the plurality of movable chuck sections 5, and transmits rotational power due to the axial rotation of the transmission shaft 50 to each distributed chuck 51, which is each material gripping part. Specifically, each movable chuck section 5 is generally composed of a distributed chuck 51 as a material gripping part, a pulley-timing belt mechanism as a twisting drive means, and a feed hydraulic cylinder 52 as a feed drive means, on a movable base 5a.

[0048] In this embodiment, the pulley-timing belt mechanism transmits the rotational driving force of the transmission shaft 50 to the distributed chuck 51, which is a material gripping part, and the discharge hydraulic cylinder 52 is a reciprocating drive mechanism that moves the distributed chuck 51 back and forth by hydraulic pressure. Furthermore, on the movable base 5a, a threaded portion 92 is screwed onto the shaft member 9, and as the shaft member 9 (9a or 9b) rotates on its axis, the threaded portion 92 receives a reaction force from the shaft member 9 and moves back and forth along the shaft member 9, causing the movable base 5a to move horizontally.

[0049] The movable base 5a described above is a pedestal that can move along a rod-shaped shaft member 9 that extends in the direction of the feed-out of the raw pipe material S. The movable base 5a is placed on a guide rail 5b laid parallel to the shaft member 9 via a guide block 5c, and moves horizontally along the guide rail 5b. Support walls 521 and 522 are erected vertically on the movable base 5a and perpendicular to the direction of extension of the shaft member 9.

[0050] The distributed chuck 51 is a material gripping unit that grips the raw pipe material S on the movable base 5a so that it can rotate on an axis and face the roll stand 2 in the rolling area. The distributed chuck 51 has a structure in which the raw pipe material S is inserted through the inside, and the inserted raw pipe material S is gripped by the divided chucks 511 and 512 from the outside. The distributed chuck 51 is also fixed to support walls 521 and 522 on the movable base 5a, and is supported so as to receive reaction forces from these support walls 521 and 522.

[0051] The distributed chucks 51 are mechanisms that receive a reaction force from the movable base 5a via the support walls 521 and 522 to hold the raw pipe material S, position the raw pipe material S facing the roll stand 2, and intermittently rotate the raw pipe material S on its axis by predetermined angles. Multiple distributed chucks are arranged in front of the movable base 5a, i.e., on the side facing the roll stand 2, and on the rear side of the movable base 5a.

[0052] These distributed chucks 51 hold the raw pipe material S by inserting it and gripping it with chucks 511 and 512. In addition, a pulley 96 is integrally attached to the outer circumference of one of the chucks 512 as a power transmission function. This pulley 96 transmits rotational power from the transmission shaft 50 to the entire distributed chuck 51. When this rotational power is transmitted to the distributed chuck 51, the distributed chuck 51 intermittently rotates the raw pipe material S gripped by chucks 511 and 512 around the internal mandrel 4.

[0053] The transmission shaft 50 is a rod-shaped member that extends along the feeding direction of the raw pipe material S and is rotated axially by a twisting drive motor 643, which is a twisting power source. In this embodiment, a sliding pulley 94 is slidably fitted to the transmission shaft 50. The sliding pulley 94 has an insertion portion 94a that matches the cross-sectional shape of the transmission shaft 50 and through which the transmission shaft 50 is inserted, and is a member that can slide in the feeding direction relative to the inserted transmission shaft 50.

[0054] The rotation of the sliding pulley 94 is transmitted to the pulley 96 on the distributed chuck 51 side via the twisting timing belt 654 on the movable base 5a. In this embodiment, the transmission shaft 50 has a hexagonal cross-section, and the insertion portion 91a also has a hexagonal cross-section. As a result, the sliding pulley 94 slides in the axial direction of the transmission shaft 50 but not in the circumferential direction. Consequently, the sliding pulley 94 slides on the transmission shaft 50 as the movable base 5a moves back and forth, and transmits rotational power to the distributed chuck 51 via the twisting timing belt 654.

[0055] The torsional timing belt 654 is wrapped around pulleys 94 and 96, and is also wrapped around the idling pulley 95, which is pivotally supported by the support wall 522 on the rotating shaft 95a, and revolves along a roughly triangular circular trajectory. This torsional timing belt 654 is an endless (annular) belt member with numerous teeth that engage with the teeth formed on the outer circumference of each pulley. In this embodiment, a high-strength general-purpose belt is used, which is made of high-strength rubber and has a core wire made of glass fiber or aramid fiber. Furthermore, it is preferable to use an even higher-strength belt specifically designed for low-speed, high-torque ranges, which is made of high-strength urethane, as the torsional timing belt 654.

[0056] The twisting timing belt 654 then moves from pulley 94 to pulley 95, to pulley 96 positioned on the outer circumference of the distributed chuck 51, and to the idling pulley 95. The rotational power from the transmission shaft 50 is transmitted from pulley 94 to the twisting timing belt 654, and the power transmitted via the twisting timing belt 654 causes the raw pipe material S gripped by the chucks 511 and 512 of the distributed chuck 51 to rotate axially via pulley 96.

[0057] Meanwhile, on the movable base 5a, a threaded portion 92 is screwed onto the shaft member 9. This threaded portion 92 is fixed to the support wall 521, and as the shaft member 9 (9a or 9b) rotates on its axis, the threaded portion 92 receives a reaction force from the shaft member 9 and moves back and forth along the shaft member 9. As the threaded portion 92 moves back and forth, it presses the support wall 521 forward or backward, and this pressing force is transmitted from the support wall 521 to the movable base 5a, causing the movable base 5a to move horizontally.

[0058] On the other hand, the feed hydraulic cylinder 52 is a feed power source that constitutes the feed drive means. By extending and retracting hydraulically along the feed direction of the raw pipe material S, it rotates the vertical arm 53 around the support pin 53a as a pivot point, advancing the distributed chuck 51 and feeding the raw pipe material S held by the distributed chuck 51 toward the rolling area. More specifically, the feed hydraulic cylinder 52 is connected to the support member 56 at the rear engaging portion 52b, and the vertical arm 53 is connected to the front engaging portion 52a. This vertical arm 53 is supported by the support member 56, so the feed hydraulic cylinder 52 as a whole is held horizontally.

[0059] The vertical arm 53 is a rigid, elongated member, which is rotatably connected to the tip of the support member 56 by a support pin 53a at its midpoint, and its lower end is connected to a connecting portion 54 which is connected to the tip 55 of the distributed chuck 51. The tip 55 of the distributed chuck 51 is a member that constitutes the front part of the gripping means for gripping the raw pipe material S, and a connecting portion 54, which is an annular member concentric with the tip 55, is fitted onto the outer circumference of this tip 55. This annular connecting portion 54 has an inner diameter slightly larger than the outer diameter of the tip 55, and can be tilted slightly forward and backward relative to the tip 55 by a support pin 54a.

[0060] With this mechanism, when the feed hydraulic cylinder 52 is shortened, the engagement portion 52a at the tip is retracted, and the upper end of the vertical arm 53 is also retracted. Since the vertical arm 53 is pivotally supported by a support pin 53a, when the upper end of the vertical arm 53 is retracted, the rear end of the vertical arm 53 is pushed forward, the annular connecting portion 54 is advanced, and the tip portion 55 of the dispersion chuck 51, which is connected to this connecting portion 54 via a support pin 54a, is pushed forward. As a result, the raw pipe material S held by the dispersion chuck 51 is fed forward, that is, toward the rolling area.

[0061] (Rolling method) Next, the rolling method according to the present invention will be described. The rolling method of the present invention can be carried out by operating the Pilger rolling mill 100 described above. The operation of the Pilger rolling mill 100 and the implementation of the rolling method will be described in detail below. In the rolling method according to this embodiment, a raw pipe material S, which is a metal material, is fed toward the rolling region formed by the rolling rolls 1,1, and the raw pipe material S is rolled within the rolling region.

[0062] At this time, the mandrel 4 is attached to the mandrel support pipe 41, and the mandrel support pipe 41 is fixedly held in place by the shaft holding section 69. Simultaneously, the mandrel 4 and the mandrel support pipe 41 are inserted into the raw pipe material S before rolling. After that, the raw pipe material S is held by the chucks 511 and 512 of each movable chuck 5, and the tip portion of the raw pipe material S is positioned toward the rolling area formed by the rolling rolls 1,1 inside the roll stand 2.

[0063] Furthermore, a rod-shaped shaft member 9 extends along the direction in which the raw pipe material S is fed out, and threaded portions 92 on each movable chuck 5 are screwed onto this shaft member 9. By rotating the shaft member 9 (9a, 9b), the base portion 62 can move back and forth along the shaft member 9 together with the threaded portions 92.

[0064] The base 62 is equipped with feed drive motors 641 and 642, which are feed drive means, and a twist drive motor 643, which is a twist drive means. These drive motors are driven intermittently in accordance with the rolling operation. When these drive motors 641, 642, and 643 are driven, the pulleys 661, 662, and 663 begin to rotate intermittently while receiving a reaction force from the base 62.

[0065] When pulley 663 is rotated, power is transmitted to pulley 93 via the power source side timing belt 653, causing the connecting part 91 to rotate. The connecting part 91 engages with the transmission shaft 50, and the rotational drive causes the transmission shaft 50 to rotate axially.

[0066] On the other hand, when pulleys 661 and 662 are rotated, power is transmitted to pulleys 421 and 422 via the feed timing belts 651 and 652, causing the connecting parts 411 and 412 to rotate. Front and rear shafts 9a and 9b are inserted through the connecting parts 411 and 412, respectively, and the connecting parts 411 and 412 are fixed to the outer circumferential surface of the shaft member 9. As the connecting parts 411 and 412 rotate, the front and rear shafts 9a and 9b are rotated axially, respectively.

[0067] On the other hand, front and rear shafts 9a and 9b extend from the front and rear of the conveying section 6 along the direction in which the raw pipe material S is fed out, and threaded portions 92 on each movable chuck 5 are screwed onto these front and rear shafts 9a and 9b, and by rotating the shaft members 9 (9a, 9b), the threaded portions 92 move along the shaft members 9 together Moving base 5a It moves back and forth.

[0068] A transmission shaft 50 extends from the movable base 5a and is driven intermittently in accordance with the rolling operation. When the transmission shaft 50 rotates, the sliding pulley 94 rotates, and when the sliding pulley 94 rotates, power is transmitted to the pulley 96 via the torsional timing belt 654, causing the chucks 511 and 512 to rotate.

[0069] Furthermore, on the movable base 5a, the female threaded portion of the threaded portion 92 is screwed onto the front / rear shaft 9a or 9b, and as the front / rear shaft 9a or 9b rotates, it receives a reaction force from the shaft member 9, causing the threaded portion 92 to move back and forth, thereby moving the base 62 back and forth along the shaft member 9. Specifically, the threaded portion 92 is screwed into the female threaded portion of the threaded portion 92 when the front / rear shaft 9a or 9b is inserted through it and the threaded portion 92 is supported by the support wall 521, and the threaded portion 92 is screwed into the female threaded portion of the threaded portion 92 with the threaded portion engraved on the outer circumferential surface of the front / rear shaft 9a or 9b that is inserted through it.

[0070] The female threaded member, which serves as the threaded portion 92, moves back and forth along the front and rear shafts 9a or 9b, receiving a reaction force from the front and rear shafts 9a or 9b as the front and rear shafts 9a or 9b are rotationally driven by the twisting drive motor 643. As the threaded portion 92 moves back and forth, it presses the support wall 521 forward or backward, and this pressing force is transmitted from the support wall 521 to the movable base 5a, causing the movable base 5a to move horizontally in the feeding direction of the raw pipe material S. As the movable base 5a moves in the feeding direction of the raw pipe material S, the distributed chuck 51 receives a reaction force from the movable base 5a to hold the raw pipe material S and sequentially feeds the raw pipe material S into the rolling area.

[0071] At this time, the twisting drive motor 643 is rotated in synchronization with the movement of the movable base 5a, causing the pulley 663 to rotate, and the transmission shaft 50 to rotate axially via the twisting timing belt 654. As the transmission shaft 50 rotates axially, power is transmitted to each movable chuck section 5, and as the transmission shaft 50 rotates on the movable base 5a, the sliding pulley 94 rotates, and as the sliding pulley 94 rotates, power is transmitted to the pulley 96 via the twisting timing belt 654, causing the chucks 511 and 512 to rotate. As the chucks 511 and 512 rotate, the mandrel support pipe 41 and the raw pipe material S held by the chucks 511 and 512 are rotated axially, causing the raw pipe material S to twist.

[0072] In this way, as the raw pipe material S and the mandrel support pipe 41 are rotated and twisted on their axis and brought into the rolling region, the raw pipe material S is advanced with the mandrel 4 inserted inside it. When the tip of the raw pipe material S is positioned in the rolling region formed by the rolling rolls 1,1, the two tapered grooved rolling rolls 1,1 rotate horizontally forward and backward with the mandrel 4 as the core, rolling the raw pipe material S to produce a product pipe P with the desired diameter and wall thickness. The feeding and axial rotation (twisting) of the raw pipe material S in the conveying section 6 are synchronized by the reciprocating drive cycle of the rolling rolls 1,1 and the control of the control unit, and the raw pipe material S is fed intermittently little by little while the rolling rolls 1,1 return.

[0073] In particular, in this embodiment, the shaft member 9 is divided into a front shaft 9a and a rear shaft 9b at the front and rear of the conveying section 6. While the moving chuck 5 on one shaft side grips the raw pipe material S and moves it forward while twisting it, the moving chuck 5 on the other shaft side releases its grip on the raw pipe material S and moves it back to the home position at the rear end of the movement range. Then, when one shaft side grips the raw pipe material S and reaches the tip of the movement range, the moving chuck 5 side that has been moved back to the rear end of the other shaft side grips the raw pipe material S, and releases its grip on the raw pipe material S on the side that has reached the tip of the movement range.

[0074] Subsequently, while the moving chuck 5 on the other side, which has been retracted to its rear end, grips the raw pipe material S and moves it forward, the moving chuck 5 on the side that has released its grip is retracted to its home position at the rear end of the movement range. In this way, by gripping the raw pipe material S with one moving chuck 5 and moving it forward, while the other moving chuck 5 is retracted to its home position at the rear end of the movement range, the gripping state by the moving chuck 5 can be maintained at all times, and the raw pipe material S can be fed out continuously.

[0075] (Effects / Actions) In this embodiment, when feeding the raw pipe material S into the rolling area, the driving force of the twisting drive motor 643 fixed on the base portion 62 is used as the thrust to move the movable chuck 5. At this time, the movable chuck 5 moves integrally with the movable base 5a along the shaft member 9, and the distributed chuck 51 that grips the raw pipe material S, which is the object to be driven, also moves together with the movable base 5a of the movable chuck 5. Furthermore, in synchronization with the movement of the movable base 5a, the feed drive motors 641 and 642 fixed to the movable chuck portion 5 are rotated, causing the mandrel support pipe 41 and the raw pipe material S gripped by the distributed chuck 51 on the movable base 5a to rotate axially and twist the raw pipe material S.

[0076] According to this embodiment, since the driving force is transmitted via an annular belt member and pulleys, the drive system can be made lighter compared to conventional structures that transmit power using a combination of gears, and higher speeds can be achieved. In detail, due to the connection on the base, the drive motor and the driven shaft cannot be placed on the same axis. Conventionally, in order to fill this distance between axes, it was necessary to increase the diameter of the gear or add an intermediate idler gear, which increased the inertia (moment of inertia) and hindered the increase in speed.

[0077] In contrast, in this embodiment, by using a timing belt, it is possible to use pulleys made of materials with a low specific gravity, such as aluminum alloy, without using heavy gears. Since these pulleys can have the minimum necessary diameter and low required strength, the inertia can be significantly reduced. Furthermore, unlike gears, pulleys do not have backlash, which improves positioning performance, reduces impact noise between metals, and can contribute to an improved working environment.

[0078] As a result, the size and output capacity of each device in the drive system can be reduced, production efficiency can be increased by speeding up operation, and energy savings can also be achieved. In particular, in this embodiment, the shaft member 9 is divided into two parts, and one of the movable chucks 5 grips the raw pipe material S and moves it forward at the front and rear of the movable chuck section 5, while the other movable chuck 5 is moved back to the home position at the rear end of the movement range. This ensures that the gripping state by the movable chuck 5 is always maintained while the raw pipe material S is continuously fed out. It should be noted that the present invention is not limited to the embodiments described above, and the components can be modified and implemented in practice without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriate combinations of the multiple components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. [Explanation of Symbols]

[0079] P…Product pipe S…Material pipe material 1,1...Rolling rolls 1a,1a…hole type 2… Roll stand 3…Main drive unit 4… Mandrel 5...Movement zipper section 5a...Moving base 5b... Guide rail 5c... Guide block 6…Conveyor Unit 8…Outside grip part 9… Shaft component 9a…Front shaft 9b...Rear shaft 31,31…Rotational body 32…Thrust rod 41… Mandrel support pipe 50…Transmission shaft 51... Distributed Chuck 52... Hydraulic discharge cylinder 52a...Engagement part 52b...Engaging part 53…Vertical Arm 53a...Support pin 54...Connection part 54a...Support pin 55...Tip 56…Support member 62...Base 69... Shaft holding part 91...Connection part 91a... Insertion part 92... Threaded section 94... Sliding pulley 94a... Insertion part 95... Idling pulley 95a... Rotation axis 100... Pilger rolling mill 411, 412… Connection part 421, 422, 661, 662, 663… Pulley 511, 512... Chuck 521,522,621,622…Supporting wall 623…legs 624... Pedestal 641, 642… Drive motors for power transmission 641a, 642a, 643a... Rotation axis 643... Torsional drive motor 651, 652… Timing belts for transport 653…Power source side timing belt 654... Torsional timing belt

Claims

1. A raw tube material control mechanism for a Pilger rolling mill, which feeds a raw tube material made of metal tubular material or solid rod material toward a rolling region formed by rolling rolls, and rolls the raw tube material within the rolling region while gripping it in a hole mold having a recess that is pressed against the outer circumference of the raw tube material, A rod-shaped shaft member extending along the direction in which the raw pipe material is fed out, A movable base that can move along the shaft member, On the aforementioned movable base, a distributed chuck is provided to grip the raw pipe material so that it can rotate on an axis and face the rolling area, A screwed portion is screwed onto the shaft member on the movable base, and receives a reaction force from the shaft member to move the movable base back and forth along the shaft member, On the movable base, a twisting drive means for axially rotating the raw pipe material gripped by the distributed chuck, A drive means for rotating the shaft member, A rod-shaped transmission shaft extends along the direction in which the raw pipe material is fed out and is rotated on its axis by a twisting power source. Equipped with, The torsional drive means comprises a torsional power source that outputs rotational power and an annular belt member that transmits the rotational power to the distributed chuck. Multiple distribution chucks are arranged along the transmission axis, The belt member is provided for each of the plurality of distributed chucks and transmits rotational power due to the axial rotation of the transmission shaft to each distributed chuck, and the rotational power transmitted via the belt member causes the raw pipe material gripped by the distributed chuck to rotate axially. A raw pipe material control mechanism for a Pilger rolling mill, characterized by the following features.

2. A sliding pulley having an insertion portion through which the transmission shaft is inserted, which matches the cross-sectional shape of the transmission shaft, and which is slidable relative to the transmission shaft in the feeding direction, An annular power source-side belt member that transmits the rotational power of the aforementioned twisting power source to the sliding pulley, Furthermore, The aforementioned power source for twisting is installed outside the mobile base. The aforementioned transmission shaft has a polygonal cross-section. The belt member moves back and forth together with the movable base. The sliding pulley slides along the transmission shaft in accordance with the movement of the twisting power source, and transmits the rotational power via the power source-side belt member. The raw pipe material control mechanism for a Pilger rolling mill according to feature 1.

3. The feeding drive means is A power source installed outside the aforementioned mobile base and outputting rotational power, The annular belt member that transmits the rotational power and Equipped with, The power transmitted via the belt member rotates the shaft member. The raw pipe material control mechanism for a Pilger rolling mill according to feature 1.

4. The raw pipe material control mechanism for a Pilger rolling mill according to Claim 1, characterized in that the shaft member is divided into a front and rear section of the feeding drive means, and the divided front and rear shaft members are each independently rotationally driven.

5. A method for controlling raw tube material in a Pilger rolling mill, wherein raw tube material made of metal tubular material or solid rod material is fed toward a rolling region formed by rolling rolls, and the raw tube material is rolled within the rolling region while being gripped by a hole mold having a recess that is pressed against the outer circumference of the raw tube material, The process involves gripping the raw pipe material with a distributed chuck so that it can rotate on an axis, with the raw pipe material facing the rolling area, on a movable base that can move along a rod-shaped shaft member extending in the direction of the raw pipe material being fed out, The process involves rotating the shaft member into which the threaded portion is screwed on the movable base using a drive mechanism, thereby obtaining a reaction force from the shaft member and moving the movable base forward and backward along the shaft member, and rotating the raw pipe material gripped by the distributed chuck on the movable base using a torsion drive mechanism. Includes, The aforementioned distributed chucks are arranged in multiple locations along a rod-shaped transmission shaft that extends in the direction of feeding the raw pipe material and is rotated axially by a twisting power source. The torsional drive means comprises a torsional power source that outputs rotational power and an annular belt member that transmits the rotational power to the distributed chuck. The belt member is provided for each of the plurality of distributed chucks and transmits rotational power due to the axial rotation of the transmission shaft to each distributed chuck, and the power transmitted via the belt member causes the raw pipe material gripped by the distributed chuck to rotate axially. A method for controlling raw pipe material in a Pilger rolling mill, characterized by the following features.

6. A sliding pulley having an insertion portion through which the transmission shaft is inserted, which matches the cross-sectional shape of the transmission shaft, and which is slidable relative to the transmission shaft in the feeding direction, An annular power source-side belt member that transmits the rotational power of the aforementioned twisting power source to the sliding pulley, Furthermore, The aforementioned power source for twisting is installed outside the mobile base. The aforementioned transmission shaft has a polygonal cross-section. The belt member moves back and forth together with the movable base. The sliding pulley slides along the transmission shaft in accordance with the movement of the twisting power source, and transmits the rotational power via the power source-side belt member. The method for controlling raw pipe material of a Pilger rolling mill according to feature 5.

7. The feeding drive means is A power source installed outside the aforementioned mobile base and outputting rotational power, The annular belt member that transmits the rotational power and Equipped with, The power transmitted via the belt member rotates the shaft member. The method for controlling raw pipe material of a Pilger rolling mill according to feature 1.

8. The method for controlling raw pipe material of a Pilger rolling mill according to claim 5, characterized in that the shaft member is divided into a front and rear section of the feeding drive means, and the divided front and rear shaft members are each independently rotationally driven.

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