CN111408624A - Double-core-rod mechanism and method for rolling metal pipe - Google Patents
Double-core-rod mechanism and method for rolling metal pipe Download PDFInfo
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- CN111408624A CN111408624A CN202010221099.3A CN202010221099A CN111408624A CN 111408624 A CN111408624 A CN 111408624A CN 202010221099 A CN202010221099 A CN 202010221099A CN 111408624 A CN111408624 A CN 111408624A
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- rotary cylinder
- metal pipe
- ejector rod
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- 238000005096 rolling process Methods 0.000 title claims abstract description 226
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 84
- 239000002184 metal Substances 0.000 title claims abstract description 84
- 230000007246 mechanism Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 238000009785 tube rolling Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000010622 cold drawing Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/10—Finishing, e.g. smoothing, sizing, reeling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/20—Revolving, turning-over, or like manipulation of work, e.g. revolving in trio stands
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a double-mandrel mechanism for rolling metal pipes, which comprises a mandrel, two sets of mandrel devices, a rotating device and a base, wherein the mandrel devices are arranged on the two sets of mandrel devices; the rotary device comprises a rotary cylinder body, a rotary cylinder support and a rotary cylinder transmission structure for driving the rotary cylinder body to rotate; the rotary cylinder support is fixedly connected to the base; the two sets of the ejector rod devices are respectively arranged on the left side and the right side of the axis of the rotary cylinder body, and the ejector rod devices synchronously rotate along with the rotary cylinder body; the ejector rod device comprises an ejector rod, a guide seat and an adjusting oil cylinder; one end of the ejector rod is fixedly provided with a core rod, the other end of the ejector rod is connected with a piston rod of an adjusting oil cylinder, and the adjusting oil cylinder drives the ejector rod to axially reciprocate on the guide seat; the axes of the two ejector rods of the two sets of ejector rod devices are parallel to the axis of the rotary cylinder and are positioned on the same plane. Realizing the reciprocating rolling deformation processing process of the metal pipe; and the double-core rod mechanism can be used for simultaneously processing two metal pipes, so that the production efficiency is improved. The wall-reducing extension processing of the metal pipe is realized.
Description
Technical Field
The invention belongs to the technical field of metal rolling, and particularly relates to a double-core rod mechanism and a method for rolling a metal pipe.
Background
In the forming production process of the metal pipe wall-reducing deformation processing, the core rod is used as an inner deformation tool and an outer deformation tool, namely a roller or a die, so that the wall thickness of the metal pipe is reduced, and the length is extended. At present, core rods used in the forming process mainly have two types, one type is a short core rod, and the short core rod is characterized in that: the length of the core rod is slightly longer than that of the deformation zone of the metal pipe, and the core rod has a fixed position in the deformation zone in the deformation process. The other is a long core rod, which is characterized in that: the length of the core rod is larger than or close to that of the metal pipe, the core rod moves in a deformation zone in the deformation process, and relative movement can exist or does not exist between the core rod and the metal pipe. The short core rod is mainly used in the cold rolling and cold drawing process of the metal pipe, and the long core rod is mainly used in the hot rolling, wall-reducing, extending and deforming process of the metal pipe.
In the forming process, the two kinds of core rods only participate in the primary deformation process, the cost is high, the efficiency is low, the quality of the inner wall of the pipe produced by the existing core rods is poor, and the yield is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a double-core rod mechanism for rolling a metal pipe.
In order to solve the technical problems, the invention adopts the technical scheme that: a double-mandrel mechanism for rolling metal pipes comprises two sets of mandrels, two sets of mandrel devices, a rotating device and a base, wherein the two sets of mandrels work simultaneously, the two sets of mandrels are respectively positioned on rolling lines of two rolling mills of a rolling unit, the two sets of mandrels are respectively a penetrating rolling mandrel and a releasing rolling mandrel, and after one rolling cycle is finished, the two sets of mandrels are exchanged in position through the rotating device to carry out the next rolling cycle;
the rotary device comprises a rotary cylinder body, a rotary cylinder support and a rotary cylinder transmission structure for driving the rotary cylinder body to rotate; the rotary cylinder support is fixedly connected to the base;
the two sets of the ejector rod devices are respectively arranged on the left side and the right side of the axis of the rotary cylinder body, and the ejector rod devices synchronously rotate along with the rotary cylinder body; the ejector rod device comprises an ejector rod, a guide seat and an adjusting oil cylinder;
one end of the ejector rod is fixedly provided with a core rod, the other end of the ejector rod is connected with a piston rod of an adjusting oil cylinder, and the adjusting oil cylinder drives the ejector rod to axially reciprocate on the guide seat;
the axes of two ejector rods of the two sets of ejector rod devices are parallel to the axis of the rotary cylinder and are positioned on the same plane; the distance between the two push rods and the center of the rotary cylinder body is the same.
Further, revolving drum transmission structure includes gear, transmission shaft, motor, supporting seat, and the gear setting is on the transmission shaft, and the transmission shaft sets up on the supporting seat, and the transmission shaft links firmly with the motor output shaft, and the motor passes through transmission shaft drive gear and rotates, revolving drum transmission structure sets up in the rectangular channel of base.
Furthermore, the rotating shaft of the rotary cylinder body is arranged on the rotary cylinder support, the outer side surface of the rotary cylinder body is provided with teeth, and the rotary cylinder body is meshed with the gear.
Furthermore, the rotating device comprises at least two sets of rollers which are fixed on the base and tangent to the outer side of the rotating cylinder. The gyro wheel is located gyration barrel bottom axis both sides, plays the supporting role to the gyration barrel, has improved the motion stability of gyration barrel simultaneously.
Furthermore, the mandrel consists of a middle rolling strip cylinder, a front guiding cone and a rear guiding cone, and the diameter of the middle rolling strip cylinder is equal to the inner diameter of the finished metal pipe.
Further, the length of the middle rolling strip cylinder of the mandrel is 50-150 mm; the lengths of the front and rear leading-in cones are both 50-150 mm, and the cone angle is 5-20 degrees.
The invention also aims to provide a metal pipe rolling method, which comprises at least 1 rolling unit, wherein a steel tilting mechanism for conveying the metal pipe is arranged between every two adjacent rolling units, and each rolling unit comprises 2 rolling mills and 1 sleeve of the double-mandrel mechanism; the metal pipe processing process is as follows:
1) when the rolling mill is started, two sets of mandril devices of the double-mandril mechanism are positioned at the left side and the right side of the axis of the rotary cylinder body, the left adjusting oil cylinder and the right adjusting oil cylinder are both in a withdrawing state, the pierced billet enters an input roller way of a left rolling mill of the 1# rolling unit after being heated to a rolling temperature, and the left mandril and the right mandril of the 1# rolling unit are both at initial positions;
2) the left adjusting oil cylinder drives the left core rod to enter a roll gap and is positioned at the rolling position of the left rolling mill, an input roller way of the 1# rolling unit feeds the pierced billet into a rolling area of the left rolling mill, the pierced billet is bitten into the roll for the first time, the left core rod is bitten for the second time, and the rolling process is started;
3) the tail part of the pierced billet enters a rolling area, the head part of the left mandrel is exposed out of the pierced billet to complete a left side rolling procedure, the oil cylinder is adjusted to retreat at the rolling speed, and the left mandrel and the pierced billet synchronously leave the rolling area of the left side rolling mill;
4) starting the rotary drum transmission device, rotating the rotary drum, enabling the left mandrel to reach a rolling line of a right rolling mill, and enabling the right mandrel to reach a rolling line of a left rolling mill;
5) feeding the left mandrel penetrated with the pierced billet into a rolling deformation zone of a rolling mill on the right side for rolling, rolling the mandrel out of the pierced billet, and finishing the process of the 1# rolling unit; meanwhile, the right mandrel of the 1# rolling unit reaches the rolling area of the left rolling mill, waits for the next pierced billet and repeats the rolling process;
6) the metal pipe rolled out from the rolling deformation zone of the rolling mill on the right side of the No. 1 rolling unit is transversely moved by the tilting mechanism and enters an inlet rolling line of the rolling mill on the left side of the No. 2 rolling unit, and a left mandrel and a right mandrel of the No. 2 rolling unit are both at initial positions;
7) and the 2# rolling unit completes the rolling process according to the rolling program of the 1# rolling unit.
Furthermore, in the process of the metal pipe biting into the mandrel, the oil cylinder is adjusted to drive the mandrel and the metal pipe to retreat when the rolling of the metal pipe is about to finish, and the retreat speed is equal to the rolling speed of the metal pipe.
Furthermore, in the process of rolling the metal pipe out of the mandrel, the rolling is finished, when the metal pipe is separated from the mandrel, the oil cylinder is adjusted to drive the mandrel to forward the metal pipe, and the forward speed is greater than the running speed of the metal pipe.
Further, the sizes of the processed pierced billets are as follows: diameter: 50-200 mm, wall thickness: 5-20 mm, length: 1000-6000 mm; and (4) finished product size: diameter: 40-180 mm, wall thickness: 2.5-10 mm; rolling temperature: 200-900 ℃; rolling speed: 0.5 to 2.5 m/s.
Compared with the prior art, the invention has the following beneficial effects:
(1) the double-conical core rod is adopted, so that the metal pipe can be more accurately bitten from two ends of the core rod, the processing efficiency is improved, and the metal pipe is prevented from being damaged; the contact length between the core rod and the inner surface of the metal pipe is reduced, the friction damage is small, the quality of the inner wall of the pipe is effectively improved, and the yield is improved. And the weight of the core rod is reduced, thereby being beneficial to the processing and manufacturing of the core rod.
(2) The invention provides a new core rod device for the production of wall-reducing rolling deformation of metal pipes, which is combined with special rolling equipment, and can make one core rod finish two wall-reducing rolling deformation processes by a rotating device, thereby canceling the rod-removing process and realizing the reciprocating rolling deformation processing process of the metal pipes; and the double-core rod mechanism can be used for simultaneously processing two metal pipes, so that the production efficiency is improved. The method realizes the wall-reducing extension processing of the metal pipe, and realizes the purposes of producing the metal pipe with thin wall, good inner surface quality and high yield at low cost.
(3) The two sets of core rods are respectively positioned on rolling lines of two rolling mills of one rolling unit, the two sets of core rods can work simultaneously, one core rod is used for penetrating rolling, the other core rod is used for releasing rolling, and after one rolling cycle is finished, the two core rods are switched in position to carry out the next rolling cycle.
Drawings
FIG. 1 is a schematic front view of a dual mandrel mechanism according to example 1;
FIG. 2 is a left side view of the dual core rod mechanism of example 1;
FIG. 3 is a top view of the dual mandrel mechanism of example 1;
FIG. 4 is a schematic structural view of a mandrel in example 1;
FIG. 5 is a plan view of the double core rod mechanism and the tilting mechanism in example 2;
fig. 6 is a flow chart of the operation of the tilting mechanism in embodiment 2.
Reference numerals: 10. a core rod; 11. a cylinder; 12. a cone; 13. a through hole; 20. a rotary cylinder; 21. a guide seat; 22. a ring gear; 30. adjusting the oil cylinder; 31. a top rod; 40. a base; 41. a rotary drum support; 42. a roller; 50. a gear; 51. a drive shaft; 52. a motor; 53. a supporting seat; 60. inputting into a roller way; 61. a run-out table; 70. a left side rolling mill; 71. a right side rolling mill; 80. 1# rolling unit; 81. a # 2 rolling unit; 90. a steel turnover mechanism; 91. turning over the steel rod; 92. and a hydraulic cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-4, a dual mandrel mechanism for rolling metal tubes comprises two sets of mandrels working simultaneously, and two sets of mandrel devices, a turning device and a base 40, wherein the two sets of mandrels are respectively positioned on rolling lines of two rolling mills of a rolling unit, the two sets of mandrels can work simultaneously, the two sets of mandrels are respectively a piercing rolling mandrel and a stripping rolling mandrel, and after one rolling cycle is completed, the two sets of mandrels are exchanged by the turning device to carry out the next rolling cycle;
the rotating device comprises a rotating cylinder body 20, a rotating cylinder support 41 and a rotating cylinder transmission structure for driving the rotating cylinder body 20 to rotate; the rotary cylinder support 41 is fixedly connected to the base 40.
Two sets of ejector rod devices are arranged on the left side and the right side of the axis of the rotary cylinder body 20, and the ejector rod devices synchronously rotate along with the rotary cylinder body 20; the ejector rod device comprises an ejector rod 31, a guide seat 21 and an adjusting oil cylinder 30.
One end of the ejector rod 31 is fixedly provided with the core rod 10, the other end of the ejector rod 31 is connected with a piston rod of the adjusting oil cylinder 30, and the adjusting oil cylinder 30 drives the ejector rod 31 to axially reciprocate on the guide seat 21.
The axes of the two push rods 31 of the two sets of push rod 31 devices are parallel to the axis of the rotary cylinder body 20 and are positioned on the same plane; the two push rods 31 are at the same distance from the center of the rotary cylinder 20.
The rotary drum transmission structure comprises a gear 50, a transmission shaft 51, a motor 52 and a support seat 53, wherein the gear 50 is arranged on the transmission shaft 51, the transmission shaft 51 is arranged on the support seat 53, the transmission shaft 51 is fixedly connected with an output shaft of the motor 52, the motor 52 drives the gear 50 to rotate through the transmission shaft 51, and the rotary drum transmission structure is arranged in a rectangular groove of the base 40.
The rotating shaft of the rotary cylinder body 20 is arranged on the rotary cylinder support 41, the gear ring 22 is arranged on the outer side surface of the rotary cylinder body 20, and the gear ring 22 on the outer side surface of the rotary cylinder body 20 is meshed with the gear 50.
The guide seat 21 is fixedly connected to the rotary cylinder 20.
The rotating device comprises at least two sets of rollers 42, the rollers 42 are fixed on the base 40, and the rollers 42 are tangent to the outer side of the rotating cylinder 20. The two sets of rollers 42 are respectively located at two sides of the bottom axis of the rotary cylinder 20, rotate along with the rotation of the rotary cylinder 20, support the rotary cylinder 20, and improve the motion stability of the rotary cylinder 20.
The mandrel 10 is of a double-cone short mandrel structure and comprises a middle rolled strip cylinder 11, a front guide cone 12 and a rear guide cone 12, the diameter of the middle rolled strip cylinder 11 is equal to the inner diameter of a finished metal pipe, the length of the middle rolled strip cylinder 11 is 50-150 mm, the preferred length is 120mm, the length of the front guide cone 12 and the length of the rear guide cone 12 are 50-150 mm, the preferred length is 100mm, and the cone angle is 5-20 degrees, and the preferred length is 15 degrees. The center of the core rod 10 is provided with a through hole 13, and the diameter of the through hole 13 is 10-80 mm, preferably 60 mm. The fixing bolt penetrates through the through hole 13 of the mandrel 10 and then is connected with the internal thread of the ejector rod 31, holes are formed in the overlapped position of the ejector rod 31 and the fixing bolt, and then the pin is driven to prevent loosening, so that the mandrel 10 is fixed on the ejector rod 31.
The ejector rod 31 is made of a thick-wall steel pipe, one end of the ejector rod 31 is provided with an internal thread connected with the core rod 10, and the other end of the ejector rod 31 is provided with an external thread used for adjusting feeding and connected with the head of a piston rod of the adjusting oil cylinder 30. The push rod 31 can move axially on the two guide seats 21 in the rotary cylinder 20 by being pushed by the adjusting oil cylinder 30, and the distance of the back and forth movement of the push rod 31 is 200 mm.
Example 2
As shown in fig. 5-6, a metal tube rolling method comprises at least 1 rolling unit, if the number of the rolling units is more than two, a tilting mechanism 90 for conveying the metal tube is arranged between the adjacent rolling units, and each rolling unit comprises 2 rolling mills and 1 set of the double-mandrel mechanism described in the embodiment 1; the aluminum alloy rolling production unit of the embodiment comprises two rolling units, namely a 1# rolling unit 80 and a 2# rolling unit 81, and comprises 4 frames of 400 transverse three-roller Y-shaped rolling mills and 2 sets of double-mandrel mechanisms, wherein each set of double-mandrel mechanism is matched with 2 frames of rolling mills to work. The pierced billet that processes is aluminum alloy tube, and pierced billet size is: diameter: 180mm, wall thickness: 15mm, length: 2000 mm;
and (4) finished product size: diameter: 160mm, wall thickness: 5 mm;
rolling temperature: 650 ℃;
rolling speed: 1 m/s.
The metal pipe processing process is as follows:
1) when the rolling mill is started, two sets of mandril devices of the double-mandrel mechanism are positioned at the left side and the right side of the axis of the rotary cylinder body 20, the left adjusting oil cylinder and the right adjusting oil cylinder are both in a withdrawing state, the pierced billet enters the input roller way 60 of the left rolling mill 70 of the 1# rolling unit 80 after being heated to a rolling temperature, and the left mandrel and the right mandrel of the 1# rolling unit 80 are both in an initial position;
2) the left adjusting oil cylinder drives the left mandrel to enter a roll gap of the left rolling mill 70 and is positioned at the rolling position of the left rolling mill 70, the input roller table 60 of the 1# rolling unit 80 feeds the pierced billet into the rolling area of the left rolling mill 70, the pierced billet is bitten into the roll for the first time, the left mandrel is bitten for the second time, and the rolling process is started;
3) the tail part of the pierced billet enters a rolling area, the head part of the left mandrel is exposed out of the pierced billet to complete a left side rolling procedure, the oil cylinder 30 is adjusted to retreat at the rolling speed, and the left mandrel and the pierced billet synchronously leave the rolling area of the left side rolling mill 70;
4) starting a rotary drum transmission device, rotating the rotary drum, enabling the left mandrel to reach a rolling line of a right rolling mill 71, and enabling the right mandrel to reach a rolling line of a left rolling mill 70;
5) feeding the left mandrel penetrated with the pierced billet into a rolling deformation zone of a right rolling mill 71 for rolling, rolling the pierced billet out of the mandrel, and finishing the working procedures of a 1# rolling unit 80; meanwhile, the right mandrel of the 1# rolling unit 80 reaches the rolling area of the left rolling mill 70, waits for the next pierced billet and repeats the rolling process;
6) the metal pipe rolled out from the rolling deformation zone of the right rolling mill 71 of the 1# rolling unit 80 is transversely moved by the tilting mechanism 90 and enters an inlet rolling line of a left rolling mill of the 2# rolling unit 81, and a left mandrel and a right mandrel of the 2# rolling unit 81 are both at initial positions;
7) and the 2# rolling unit 81 completes the rolling process according to the rolling program of the 1# rolling unit 80.
In the process that the metal pipe bites into the mandrel 10 for rolling, the adjusting oil cylinder 30 drives the mandrel 10 and the metal pipe to retreat when the rolling of the metal pipe is about to finish, and the retreat speed is equal to the rolling speed of the metal pipe.
In the process of rolling the metal pipe out of the mandrel 10, the rolling is finished, when the metal pipe is separated from the mandrel 10, the adjusting oil cylinder 30 drives the mandrel 10 to forward the metal pipe, and the forward feeding speed is greater than the running speed of the metal pipe. The metal pipe pushing mechanism has a pushing effect, and pushes the metal pipe out of the rack within a limited stroke, so that the steel turning mechanism can conveniently perform transverse moving operation. If the rolling speed is fast enough, the metal pipe is thrown out, and the core rod 10 can not be used for accelerating pushing.
The hole patterns and the deformation of the 1# rolling unit and the 2# rolling unit are different, so that the metal pipe is processed step by step, and equipment is not easy to damage.
The steel turning mechanism consists of four hydraulic cylinders 92 and a group of steel turning rods 91, wherein two ends of each steel turning rod 91 are provided with upwards bent stoppers which respectively correspond to an output roller way of the 1# rolling unit and an input roller way of the 2# rolling unit; at the initial position, the four hydraulic cylinders 92 are all at the low position, the tilting rod 91 is in the horizontal state, and receives the metal pipe rolled by the rolling mill on the right side of the 1# rolling unit, when the metal pipe completely leaves the rolling mill and stays on the run-out roller bed, the hydraulic cylinders 92 synchronously rise until the tilting rod 91 contacts with the metal pipe, the metal pipe is lifted by the tilting rod to leave the roller bed, then the hydraulic cylinder 92 on the rolled piece side continues to rise, the hydraulic cylinder 92 on the non-rolled piece side stops, the tilting rod 91 inclines, so that the metal pipe rolls to the low position, then the hydraulic cylinder 92 resets, the metal pipe falls on the run-in roller bed of the 2# rolling unit, and the reverse rolling is prepared.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (10)
1. A double-core rod mechanism for rolling metal pipes is characterized in that: the two sets of core rods are respectively positioned on rolling lines of two rolling mills of one rolling unit, the two sets of core rods are respectively rod-penetrating rolling core rods and rod-releasing rolling core rods, and after one rolling cycle is finished, the two sets of core rods exchange positions through the rotating device to carry out the next rolling cycle;
the rotary device comprises a rotary cylinder body, a rotary cylinder support and a rotary cylinder transmission structure for driving the rotary cylinder body to rotate; the rotary cylinder support is fixedly connected to the base;
the two sets of the ejector rod devices are respectively arranged on the left side and the right side of the axis of the rotary cylinder body, and the ejector rod devices synchronously rotate along with the rotary cylinder body; the ejector rod device comprises an ejector rod, a guide seat and an adjusting oil cylinder;
one end of the ejector rod is fixedly provided with a core rod, the other end of the ejector rod is connected with a piston rod of an adjusting oil cylinder, and the adjusting oil cylinder drives the ejector rod to axially reciprocate on the guide seat;
the axes of two ejector rods of the two sets of ejector rod devices are parallel to the axis of the rotary cylinder and are positioned on the same plane; the distance between the two push rods and the center of the rotary cylinder body is the same.
2. The double core rod mechanism for rolling metal pipes according to claim 1, wherein: the rotary drum transmission structure comprises a gear, a transmission shaft, a motor and a supporting seat, the gear is arranged on the transmission shaft, the transmission shaft is arranged on the supporting seat and fixedly connected with an output shaft of the motor, the motor rotates through a transmission shaft driving gear, and the rotary drum transmission structure is arranged in a rectangular groove of the base.
3. The double core rod mechanism for rolling metal pipes according to claim 1, wherein: the rotating shaft of the rotary cylinder body is arranged on the rotary cylinder support, the outer side face of the rotary cylinder body is provided with teeth, and the rotary cylinder body is meshed with the gear.
4. The double core rod mechanism for rolling metal pipes according to claim 1, wherein: the rotary device comprises at least two sets of rollers which are fixed on the base and tangent to the outer side of the rotary cylinder.
5. The double core rod mechanism for rolling metal pipes according to claim 1, wherein: the mandrel consists of a middle rolling strip cylinder, a front guiding cone and a rear guiding cone, and the diameter of the middle rolling strip cylinder is equal to the inner diameter of a finished metal pipe.
6. The double core rod mechanism for rolling metal pipes according to claim 5, wherein: the length of the middle rolling belt cylinder of the core rod is 50-150 mm; the lengths of the front and rear leading-in cones are both 50-150 mm, and the cone angle is 5-20 degrees.
7. A metal pipe rolling method is characterized in that: comprising at least 1 rolling unit, between adjacent rolling units there is provided a tilting mechanism for transporting metal tubes, each rolling unit comprising 2 stands of rolling mill and 1 set of double mandrel mechanism according to any one of claims 1 to 6; the metal pipe processing process is as follows:
1) when the rolling mill is started, two sets of mandril devices of the double-mandril mechanism are positioned at the left side and the right side of the axis of the rotary cylinder body, the left adjusting oil cylinder and the right adjusting oil cylinder are both in a withdrawing state, the pierced billet enters an input roller way of a left rolling mill of the 1# rolling unit after being heated to a rolling temperature, and the left mandril and the right mandril of the 1# rolling unit are both at initial positions;
2) the left adjusting oil cylinder drives the left core rod to enter a roll gap and is positioned at the rolling position of the left rolling mill, an input roller way of the 1# rolling unit feeds the pierced billet into a rolling area of the left rolling mill, the pierced billet is bitten into the roll for the first time, the left core rod is bitten for the second time, and the rolling process is started;
3) the tail part of the pierced billet enters a rolling area, the head part of the left mandrel is exposed out of the pierced billet to complete a left side rolling procedure, the oil cylinder is adjusted to retreat at the rolling speed, and the left mandrel and the pierced billet synchronously leave the rolling area of the left side rolling mill;
4) starting the rotary drum transmission device, rotating the rotary drum, enabling the left mandrel to reach a rolling line of a right rolling mill, and enabling the right mandrel to reach a rolling line of a left rolling mill;
5) feeding the left mandrel penetrated with the pierced billet into a rolling deformation zone of a rolling mill on the right side for rolling, rolling the mandrel out of the pierced billet, and finishing the process of the 1# rolling unit; meanwhile, the right mandrel of the 1# rolling unit reaches the rolling area of the left rolling mill, waits for the next pierced billet and repeats the rolling process;
6) the metal pipe rolled out from the rolling deformation zone of the rolling mill on the right side of the No. 1 rolling unit is transversely moved by the tilting mechanism and enters an inlet rolling line of the rolling mill on the left side of the No. 2 rolling unit, and a left mandrel and a right mandrel of the No. 2 rolling unit are both at initial positions;
7) and the 2# rolling unit completes the rolling process according to the rolling program of the 1# rolling unit.
8. A metal tube rolling method according to claim 7, characterized in that: in the process that the metal pipe is bitten into the mandrel for rolling, the oil cylinder is adjusted to drive the mandrel and the metal pipe to retreat when the rolling of the metal pipe is about to finish, and the retreat speed is equal to the rolling speed of the metal pipe.
9. A metal tube rolling method according to claim 7, characterized in that: and in the process of rolling the metal pipe out of the mandrel, finishing rolling, and adjusting the oil cylinder to drive the mandrel to forward the metal pipe when the metal pipe is separated from the mandrel, wherein the forward speed is greater than the running speed of the metal pipe.
10. A metal tube rolling method according to claim 7, characterized in that the dimensions of the pierced blank to be worked are: diameter: 50-200 mm, wall thickness: 5-20 mm, length: 1000-6000 mm;
and (4) finished product size: diameter: 40-180 mm, wall thickness: 2.5-10 mm;
rolling temperature: 200-900 ℃; rolling speed: 0.5 to 2.5 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010221099.3A CN111408624A (en) | 2020-03-26 | 2020-03-26 | Double-core-rod mechanism and method for rolling metal pipe |
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|---|---|---|---|
| CN202010221099.3A CN111408624A (en) | 2020-03-26 | 2020-03-26 | Double-core-rod mechanism and method for rolling metal pipe |
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| CN111408624A true CN111408624A (en) | 2020-07-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112916620A (en) * | 2021-01-14 | 2021-06-08 | 王克宇 | Forging process of GCr15 roller sleeve |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066012A (en) * | 1992-05-09 | 1992-11-11 | 上海异型钢管股份有限公司 | Method for producing straight-tooth shape inside ribbed pipe |
| US6006575A (en) * | 1999-03-25 | 1999-12-28 | Usx Corporation | Reversible mandrel bar assembly |
| CN102553953A (en) * | 2011-09-07 | 2012-07-11 | 张家港保税区恒隆钢管有限公司 | Feeding mechanism of drawing machine |
| CN103722027A (en) * | 2014-01-09 | 2014-04-16 | 宁波东重机械有限公司 | Cold rolling tube mill |
| CN204685661U (en) * | 2015-06-08 | 2015-10-07 | 通化钢铁集团磐石无缝钢管有限责任公司 | The reducing plug of ACCU ROLL pipe mill |
| CN205056629U (en) * | 2015-02-10 | 2016-03-02 | 长葛市一鸣机械有限公司 | Two plug tandem rolling devices |
| CN106216399A (en) * | 2016-07-29 | 2016-12-14 | 长葛市鸣机械有限公司 | The method that a kind of double-core axle associating milling train produces hot rolled seamless steel tube |
| CN108080429A (en) * | 2017-12-11 | 2018-05-29 | 太原科技大学 | A kind of cold-drawing machine mandrel platform turnover device |
| CN110722004A (en) * | 2019-10-25 | 2020-01-24 | 绍兴东喆科技有限公司 | Rolling method of metal pipe |
-
2020
- 2020-03-26 CN CN202010221099.3A patent/CN111408624A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066012A (en) * | 1992-05-09 | 1992-11-11 | 上海异型钢管股份有限公司 | Method for producing straight-tooth shape inside ribbed pipe |
| US6006575A (en) * | 1999-03-25 | 1999-12-28 | Usx Corporation | Reversible mandrel bar assembly |
| CN102553953A (en) * | 2011-09-07 | 2012-07-11 | 张家港保税区恒隆钢管有限公司 | Feeding mechanism of drawing machine |
| CN103722027A (en) * | 2014-01-09 | 2014-04-16 | 宁波东重机械有限公司 | Cold rolling tube mill |
| CN205056629U (en) * | 2015-02-10 | 2016-03-02 | 长葛市一鸣机械有限公司 | Two plug tandem rolling devices |
| CN204685661U (en) * | 2015-06-08 | 2015-10-07 | 通化钢铁集团磐石无缝钢管有限责任公司 | The reducing plug of ACCU ROLL pipe mill |
| CN106216399A (en) * | 2016-07-29 | 2016-12-14 | 长葛市鸣机械有限公司 | The method that a kind of double-core axle associating milling train produces hot rolled seamless steel tube |
| CN108080429A (en) * | 2017-12-11 | 2018-05-29 | 太原科技大学 | A kind of cold-drawing machine mandrel platform turnover device |
| CN110722004A (en) * | 2019-10-25 | 2020-01-24 | 绍兴东喆科技有限公司 | Rolling method of metal pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112916620A (en) * | 2021-01-14 | 2021-06-08 | 王克宇 | Forging process of GCr15 roller sleeve |
| CN112916620B (en) * | 2021-01-14 | 2022-08-09 | 山东莱锻机械股份有限公司 | Forging process of GCr15 roller sleeve |
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