CN112222191A - Six-roller cold rolling mill for difficult-to-deform metal seamless pipe - Google Patents
Six-roller cold rolling mill for difficult-to-deform metal seamless pipe Download PDFInfo
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- CN112222191A CN112222191A CN202010990633.7A CN202010990633A CN112222191A CN 112222191 A CN112222191 A CN 112222191A CN 202010990633 A CN202010990633 A CN 202010990633A CN 112222191 A CN112222191 A CN 112222191A
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- roller
- sliding
- shaft
- seat
- holding collet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/12—Toothed-wheel gearings specially adapted for metal-rolling mills; Housings or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
- B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
- B21B31/30—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by wedges or their equivalent
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Abstract
The invention belongs to the technical field of rolling of metal seamless pipes, and particularly relates to a six-roller cold rolling mill for a difficult-to-deform metal seamless pipe. A roller holding collet chuck is arranged in a frame sleeve, a roller holding collet is arranged in the roller holding collet chuck, the roller holding collet is of a six-jaw structure which is uniformly arranged, a first holder and a second holder are clamped on the roller holding collet, a sliding seat is arranged between the first holder and the second holder, an arc-shaped slideway is arranged on the sliding seat, rollers are arranged in the arc-shaped slideway, a roller limiting block is arranged between two adjacent rollers, and two adjacent surfaces of the two adjacent roller limiting blocks are parallel to each other; the number of the rollers is six in total, and the opening angle of the pass section of a single roller is reduced by increasing the number of the rollers, so that the contact arc length of the roller pass and a metal material in the rolling process is shortened, and the longitudinal speed difference between the contact part of the groove bottom of the roller pass and the side wall part of the pass is reduced.
Description
Technical Field
The invention belongs to the technical field of rolling of metal seamless pipes, and particularly relates to a six-roller cold rolling mill for a difficult-to-deform metal seamless pipe.
Background
With the rapid development of national economy, particularly the advanced high-end technical fields of aerospace, ocean engineering, nuclear power, national defense technology, atomic energy and space technology and the like, various difficultly deformed metal pipes with high product quality, excellent mechanical performance and wide variety and specification range are required to be provided, and the difficultly deformed metal has the defect of poor plastic deformation capability and is easy to crack and break in the forming process, so that the process technology, equipment and product quality are difficult to accurately control when the metal pipes are prepared. The cold rolling is one of the effective methods for producing high-precision and high-quality pipes, and is implemented by concentrating the deformation process of the tubular billet in different passes and stages in the same conical rolling groove with continuously-changed cross section, under the combined action of the roller and the core rod, the metal bears the compressive stress, the roller rotates to push the tubular billet to generate plastic deformation to drive the metal to flow, so that the deformation processes of reducing the diameter, reducing the wall, finishing and the like are realized, and the tubular billet is rolled into a pierced billet by repeating the above periodic actions. At present, the domestic main structural forms of cold rolling equipment are a two-roll cold pilger mill and a three-roll cold pilger mill, the percentage of the cold pilger mill and the three-roll cold pilger mill in the market is more than 95%, the opening angle of a pass section of a single roll of the two-roll cold pilger mill is 180 degrees, the opening angle of a pass section of a single roll of the three-roll cold pilger mill is 120 degrees, the two types of rolling mills have large contact force between the roll and a metal pipe in the rolling process, the contact arc length of the pass section and the metal material is large, the phenomenon that the longitudinal speed difference between the contact part of the bottom of the groove of the roll and the side wall part of the pass is large exists, the metal longitudinal tensile stress is large in the forming. As is known to all, too large tensile stress in deformation of difficult-to-deform metal is not beneficial to forming, and the metal is easy to generate stress failure and fracture, so that the traditional rolling mill can be used for preparing qualified finished products with high efficiency, and is not suitable for the requirements of national economy on high-speed and high-quality development. In order to thoroughly solve the problem of large speed difference between an opening of a side wall of a hole type and the bottom of a groove in the process of rolling a pipe by using a difficult deformation technology and change the stress state of a difficult deformation metal pipe in the cold rolling process, a novel cold rolling pipe mill with small speed difference between the side wall of the hole type and the bottom of the groove is needed, the contact arc length between a roll hole type curve and a metal material is reduced, and based on the problem, the invention of a difficult deformation metal seamless pipe six-roller cold rolling mill is urgently needed to solve the existing production problem.
Disclosure of Invention
The invention provides a six-roller cold rolling mill for a difficult-to-deform metal seamless pipe, which aims at solving the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a six-roller cold rolling mill for a difficult-to-deform metal seamless pipe comprises a transmission mechanism, a swing arm mechanism and a rolling main machine;
the transmission mechanism comprises a transmission base, a first shaft, a second shaft, a third shaft and a fourth shaft are sequentially arranged on the transmission base from front to back, a first gear is arranged on the right side of the first shaft, the left end of the first shaft is connected with an output shaft of a brake gear pump through a coupler, a second gear and a third gear are arranged on the second shaft, the second gear is meshed with the first gear, the fourth gears are arranged on the left and right sides of the third shaft, a driven belt wheel is arranged on the right end of the third shaft, the third gear is meshed with one of the two fourth gears, the driven belt wheel is connected with a driving belt wheel through a belt, the driving belt wheel is arranged on an output shaft of a power device, five counterweight gears are arranged on the left and right sides of the fourth shaft, and the five counterweight gears are meshed with the fourth gear, a first pin shaft is eccentrically arranged on the fifth counter weight gear, a transmission connecting rod is connected to the first pin shaft, and a second pin shaft is connected to the other end of the transmission connecting rod;
the swing arm mechanism comprises a support, a rotating shaft is arranged on the support, rocking rods are arranged on the left side and the right side of the rotating shaft, a first sliding groove is arranged in the middle of each rocking rod, a first sliding block is arranged in the first sliding groove, a small connecting rod is hinged on the first sliding block, the first sliding blocks are connected through a Y-shaped frame body, the other end of the Y-shaped frame body is arranged in a through hole in the middle of a first reinforcing rod, two nuts are arranged on the Y-shaped frame body and are respectively positioned on the two sides of the first reinforcing rod so as to realize the relative fixation of the first reinforcing rod and the Y-shaped frame body, the two ends of the first reinforcing rod are respectively connected with the two rocking rods, the first reinforcing rod is positioned on the upper parts of the rocking rods, a swing shaft is rotatably arranged at the upper ends of the two rocking rods, and a large connecting rod is arranged on the swing shaft and is inserted in, two nuts are arranged on the large connecting rod and are respectively positioned on two sides of the swing shaft;
the rolling main machine comprises a base, a rack front fixing seat and a rack rear fixing seat, wherein a sliding table is arranged on the base, sliding supporting blocks corresponding to the sliding table are arranged on the left side and the right side of the rack front fixing seat and the rack rear fixing seat, side limiting plates are fixedly connected to the outer sides of the sliding table, a top limiting plate is fixedly arranged on the upper surface of each side limiting plate, the sliding table, the side limiting plates and the top limiting plates are matched together to limit and compress the sliding supporting blocks, connecting parts are arranged on the left side and the right side of the rack rear fixing seat, a rack sleeve is commonly arranged in the rack front fixing seat and the rack rear fixing seat, a push plate is arranged at the rear end of the top of the rack sleeve, a second sliding groove is arranged on the push plate, a second sliding block is arranged in the second sliding groove, and a fixing block is arranged on the upper part of the, an adjusting bolt is arranged on the fixed block in an inserting manner, one end of the adjusting bolt is fixedly connected with the second sliding block, the other end of the adjusting bolt is in threaded connection with an adjusting nut, a roller holding collet chuck is arranged in the frame sleeve, a sleeve limiting block is fixedly arranged at the rear part of the roller holding collet chuck, an end cover is fixedly arranged at the front end of the roller holding collet chuck, the frame sleeve is positioned between the sleeve limiting block and the end cover, a roller holding collet is arranged in the roller holding collet chuck, the roller holding collet is of a uniformly arranged six-claw structure, transmission arms which are symmetrical left and right about a rolling line are arranged on the rear end surface of the roller holding collet, a first holder and a second holder are clamped on the roller holding collet, and six slide seat mounting grooves are uniformly arranged on the opposite surfaces of the first holder and the second holder, a slide seat is arranged between the first retainer and the second retainer, the slide seat is arranged in a slide seat mounting groove, the slide seat is respectively positioned between six claws of a roller holding collet, slide way limiting plates are arranged between the slide seat and the first retainer and the second retainer to realize the axial fixation between the slide seat and the first retainer and the second retainer, one side of the slide way limiting plate, which is far away from the circle center of the first retainer, is fixedly connected with a slide way limiting block through a screw to clamp the slide seat, so that the slide seat is fixed in the diameter direction of the first retainer, an arc-shaped slide way is arranged on the slide seat, a roller is arranged in the arc-shaped slide way, a roller limiting block is arranged between two adjacent rollers, two adjacent surfaces of the two adjacent roller limiting blocks are parallel to each other, and a cover plate is arranged on the rear end surface of the roller holding collet, the cover plate, the second retainer, the roller limiting block, the first retainer and the roller retaining collet are fixedly connected together through bolts, a wedge mounting groove is arranged at a position, corresponding to the sliding seat, on the roller retaining collet clamping seat, a roller adjusting upper wedge and a roller adjusting lower wedge are oppositely arranged in the wedge mounting groove, the roller adjusting upper wedge is fixedly connected with the frame sleeve through an upper wedge locking screw, a wedge adjusting axial bolt is arranged on the side surface of the roller adjusting lower wedge, the other end of the wedge adjusting axial bolt penetrates through the end cover to be connected with a nut, a slide hole is arranged at a position, corresponding to the upper wedge locking screw, on the roller adjusting lower wedge, so that the roller adjusting lower wedge slides, the adjustment of the roller and the sliding seat is realized through the sliding of the roller adjusting lower wedge, and a reasonable hole pattern is finally formed, rolling central holes for passing through pipes are formed in the roller holding collet, the first retainer, the second retainer and the cover plate;
a second pin shaft on a transmission connecting rod in the transmission mechanism is connected with a connecting part on a rear fixing seat of a rolling main machine frame, a large connecting rod in the swing arm mechanism is hinged with a second sliding block on a rolling main machine frame sleeve, and a small connecting rod in the swing arm mechanism is hinged with a transmission arm on a rolling main machine roller holding collet.
Furthermore, one of the two sliding tables is a triangular sliding table so as to guide the rack.
And furthermore, sliding plates are arranged on the contact surfaces of the sliding support blocks, the sliding table, the side limiting plate and the top limiting plate.
Furthermore, a second reinforcing rod is arranged at the lower part of the rocker.
Compared with the prior art, the invention has the following advantages:
the number of the rollers is six in total and is uniformly distributed at 60 degrees, and the opening angle of the pass section of a single roller is reduced by increasing the number of the rollers, so that the contact arc length of a roller pass and a metal material in the rolling process is shortened, the longitudinal speed difference between the contact part of the bottom of the roller pass groove and the side wall part of the pass is reduced, the longitudinal tensile stress of metal in the forming process is finally reduced, the potential risk of pulling and breaking in the rolling forming process of the difficultly-deformed metal seamless pipe is avoided, the surface quality of the pipe is favorably improved, the size error is reduced, and the metal pipe with higher quality is obtained; the contact areas of the six rollers and the metal pipe are in a compressive stress state, and plastic processing of some metal pipes which are difficult to deform can be promoted.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a cross-sectional view of the drive mechanism of the present invention;
FIG. 4 is a side view of the swing arm mechanism of the present invention;
FIG. 5 is a front view of the swing arm mechanism of the present invention;
FIG. 6 is a front view of the rolling stand of the present invention;
FIG. 7 is a schematic structural view of the rolling main unit without a base according to the present invention;
FIG. 8 is a cross-sectional view of section A-A of FIG. 7 of the present invention;
the device comprises a transmission base-1, a first shaft-2, a second shaft-3, a third shaft-4, a fourth shaft-5, a first gear-6, a brake gear pump-7, a second gear-8, a third gear-9, a driven belt wheel-10, a driving belt wheel-11, a power device-12, a fifth counter weight gear-13, a first pin shaft-14, a transmission connecting rod-15, a second pin shaft-16, a support-17, a rotating shaft-18, a rocker-19, a first chute-20, a first sliding block-21, a small connecting rod-22, a Y-shaped frame-23, a first reinforcing rod-24, a fourth gear-25, a swing shaft-26, a large connecting rod-27, a base-28, a frame front fixing seat-29, a frame rear fixing seat-30, a sliding table-31, a sliding support block-32, a side limiting plate-33, a top limiting plate-34, a connecting part-35, a frame sleeve-36, a push plate-37, a second chute-38, a third chute-9, a third chute-, A second sliding block-39, a fixed block-40, an adjusting bolt-41, a roller holding collet chuck-42, a sleeve limiting block-43, an end cover-44, a roller holding collet-45, a transmission arm-46, a first retainer-47, a second retainer-48, a sliding seat mounting groove-49, a sliding seat-50, a sliding track limiting plate-51, a sliding track limiting block-52, a roller-53, a roller limiting block-54, a cover plate-55, a roller adjusting upper wedge-56, a roller adjusting lower wedge-57, an upper wedge locking screw-58, a wedge adjusting axial bolt-59, a sliding plate-60 and a second reinforcing rod-61.
Detailed Description
In order to further illustrate the technical solution of the present invention, the present invention is further illustrated by the following examples.
As shown in fig. 1 to 8, a six-roller cold rolling mill for a difficult-to-deform metal seamless pipe comprises a transmission mechanism, a swing arm mechanism and a rolling main machine;
the transmission mechanism comprises a transmission base 1, a first shaft 2, a second shaft 3, a third shaft 4 and a fourth shaft 5 are sequentially arranged on the transmission base 1 from front to back, a first gear 6 is arranged on the right side of the first shaft 2, the left end of the first shaft 2 is connected with an output shaft of a brake gear pump 7 through a coupler, a second gear 8 and a third gear 9 are arranged on the second shaft 3, the second gear 8 is meshed with the first gear 6, four gears 25 are arranged on the left side and the right side of the third shaft 4, a driven belt wheel 10 is arranged at the right end of the third shaft 4, the third gear 9 is meshed with one of the two fourth gears 25, the driven belt wheel 10 is connected with a driving belt wheel 11 through a belt, the driving belt wheel 11 is arranged on an output shaft of a power device 12, five counter weight gears 13 are arranged on the left side and the right side of the fourth shaft 5, the fifth counter weight gear 13 is meshed with the fourth gear 25, a first pin 14 is eccentrically arranged on the fifth counter weight gear 13, a transmission connecting rod 15 is connected to the first pin 14, and a second pin 16 is connected to the other end of the transmission connecting rod 15;
the swing arm mechanism comprises a support 17, a rotating shaft 18 is arranged on the support 17, rocking bars 19 are arranged on the left side and the right side of the rotating shaft 18, a second reinforcing rod 61 is arranged on the lower portion of the rocking bar 19, a first sliding groove 20 is arranged in the middle of the rocking bar 19, a first sliding block 21 is arranged in the first sliding groove 20, a small connecting rod 22 is hinged on the first sliding block 21, the two first sliding blocks 21 are connected through a Y-shaped frame body 23, the other end of the Y-shaped frame body 23 is arranged in a through hole in the middle of the first reinforcing rod 24, two nuts are arranged on the Y-shaped frame body 23 and are respectively positioned on the two sides of the first reinforcing rod 24 so as to realize the relative fixing of the first reinforcing rod 24 and the Y-shaped frame body 23, the two ends of the first reinforcing rod 24 are respectively connected with the two rocking bars 19, and the first reinforcing rod 24 is positioned on the upper portions of the rocking bars 19, the upper ends of the two rockers 19 are rotatably provided with swing shafts 26, large connecting rods 27 are arranged on the swing shafts 26 in a penetrating manner and perpendicular to the swing shafts 26, two nuts are arranged on the large connecting rods 27, and the two nuts are respectively positioned on two sides of the swing shafts 26;
the rolling main machine comprises a base 28, a rack front fixing seat 29 and a rack rear fixing seat 30, sliding tables 31 are arranged on the base 28, one of the two sliding tables 31 is a triangular sliding table 31 to realize the guiding of the rack, sliding supporting blocks 32 corresponding to the sliding tables 31 are arranged on the left and right sides of the rack front fixing seat 29 and the rack rear fixing seat 30, side limiting plates 33 are fixedly connected to the outer sides of the sliding tables 31, top limiting plates 34 are fixedly arranged on the upper surfaces of the side limiting plates 33, the sliding tables 31, the side limiting plates 33 and the top limiting plates 34 are matched together to limit and compress the sliding supporting blocks 32, sliding plates 60 are arranged on the contact surfaces of the sliding supporting blocks 32, the sliding tables 31, the side limiting plates 33 and the top limiting plates 34, connecting parts 35 are arranged on the left and right sides of the rack rear fixing seat 30, a frame sleeve 36 is commonly arranged in the frame front fixing seat 29 and the frame rear fixing seat 30, a push plate 37 is arranged at the rear end of the uppermost part of the frame sleeve 36, a second sliding groove 38 is arranged on the push plate 37, a second sliding block 39 is arranged in the second sliding groove 38, a fixed block 40 is arranged at the upper part of the second sliding groove 38, an adjusting bolt 41 is inserted into the fixed block 40, one end of the adjusting bolt 41 is fixedly connected with the second sliding block 39, the other end of the adjusting bolt 41 is in threaded connection with an adjusting nut, a roller holding collet chuck 42 is arranged in the frame sleeve 36, a sleeve limiting block 43 is fixedly arranged at the rear part of the roller holding collet chuck 42, an end cover 44 is fixedly arranged at the front end of the roller holding collet chuck 42, and the frame sleeve 36 is positioned between the sleeve limiting block 43 and the end cover 44, a roller holding collet 45 is arranged in the roller holding collet chuck 42, the roller holding collet 45 is of a six-jaw structure which is uniformly arranged, a transmission arm 46 which is bilaterally symmetrical about a rolling line is arranged on the rear end face of the roller holding collet 45, a first holder 47 and a second holder 48 are clamped on the roller holding collet 45, six slide seat mounting grooves 49 are uniformly arranged on the opposite faces of the first holder 47 and the second holder 48, a slide seat 50 is arranged between the first holder 47 and the second holder 48, the slide seat 50 is arranged in the slide seat mounting grooves 49, the slide seats 50 are respectively positioned between the six jaws of the roller holding collet 45, slide way limiting plates 51 are arranged between the slide seat 50 and the first holder 47 and the second holder 48 so as to realize the axial fixation between the slide seat 50 and the first holder 47 and the second holder 48, a slide limiting block 52 is fixedly connected to one side of the slide limiting plate 51 far away from the circle center of the first retainer 47 through screws so as to clamp the slide 50 and fix the slide 50 in the diameter direction of the first retainer 47, an arc-shaped slide is arranged on the slide 50, rollers 53 are arranged in the arc-shaped slide, a roller limiting block 54 is arranged between two adjacent rollers 53, two adjacent surfaces of the two adjacent roller limiting blocks 54 are parallel to each other, a cover plate 55 is arranged on the rear end surface of the roller retaining collet 45, the cover plate 55, the second retainer 48, the roller limiting block 54, the first retainer 47 and the roller retaining collet 45 are fixedly connected together through bolts, a wedge mounting groove is arranged on the roller retaining collet 42 corresponding to the slide 50, and a roller adjusting upper wedge 56 and a roller adjusting lower wedge 57 which are oppositely arranged are arranged in the wedge mounting groove, the roller adjusting upper wedge 56 is fixedly connected with the rack sleeve 36 through an upper wedge locking screw 58, a wedge adjusting axial bolt 59 is arranged on the side face of the roller adjusting lower wedge 57, the other end of the wedge adjusting axial bolt 59 penetrates through the end cover 44 to be connected with a nut, a slide hole is arranged on the roller adjusting lower wedge 57 at a position corresponding to the upper wedge locking screw 58 and used for sliding the roller adjusting lower wedge 57, the adjustment of the roller 53 and the slide seat 50 is realized through the sliding of the roller adjusting lower wedge 57, a reasonable hole pattern is finally formed, and rolling center holes for penetrating through pipes are arranged on the roller holding collet 45, the first retainer 47, the second retainer 48 and the cover plate 55;
the second pin shaft 16 on the transmission connecting rod 15 in the transmission mechanism is connected with the connecting part 35 on the rear fixed seat 30 of the rolling main frame in the rolling main frame, the large connecting rod 27 in the swing arm mechanism is hinged with the second sliding block 39 on the frame sleeve 36 in the rolling main frame, and the small connecting rod 22 in the swing arm mechanism is hinged with the transmission arm 46 on the roller holding collet 45 in the rolling main frame.
While there have been shown and described what are at present considered to be the essential features and advantages of the invention, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. The utility model provides a six roller cold rolling mills of difficult deformation metal seamless pipe, its characterized in that: comprises a transmission mechanism, a swing arm mechanism and a rolling host;
the transmission mechanism comprises a transmission base (1), a first shaft (2), a second shaft (3), a third shaft (4) and a fourth shaft (5) are sequentially arranged on the transmission base (1) from front to back, a first gear (6) is arranged on the right side of the first shaft (2), the left end of the first shaft (2) is connected with an output shaft of a brake gear pump (7) through a coupler, a second gear (8) and a third gear (9) are arranged on the second shaft (3), the second gear (8) is meshed with the first gear (6), the fourth gear (25) is arranged on the left side and the right side of the third shaft (4), a driven belt wheel (10) is arranged at the right end of the third shaft (4), the third gear (9) is meshed with one of the two fourth gears (25), the driven belt wheel (10) is connected with a driving belt wheel (11) through a belt, the driving belt wheel (11) is installed on an output shaft of a power device (12), five counter weight gears (13) are installed on the left side and the right side of the fourth shaft (5), the five counter weight gears (13) are meshed with the fourth gear (25), a first pin shaft (14) is eccentrically arranged on the five counter weight gears (13), a transmission connecting rod (15) is connected to the first pin shaft (14), and a second pin shaft (16) is connected to the other end of the transmission connecting rod (15);
the swing arm mechanism comprises a support (17), a rotating shaft (18) is arranged on the support (17), rockers (19) are arranged on the left side and the right side of the rotating shaft (18), a first sliding groove (20) is arranged in the middle of each rocker (19), a first sliding block (21) is arranged in each sliding groove (20), a small connecting rod (22) is hinged to each sliding block (21), the two first sliding blocks (21) are connected through a Y-shaped frame body (23), the other end of each Y-shaped frame body (23) is arranged in a through hole in the middle of each first reinforcing rod (24), two nuts are arranged on each Y-shaped frame body (23) and are respectively positioned on the two sides of each first reinforcing rod (24) so as to realize the relative fixation of each reinforcing rod (24) and each Y-shaped frame body (23), the two ends of each first reinforcing rod (24) are respectively connected with the two rockers (19), the first reinforcing rod (24) is positioned at the upper parts of the rocking rods (19), the upper ends of the two rocking rods (19) are rotatably provided with swing shafts (26), large connecting rods (27) are arranged on the swing shafts (26) in a penetrating manner and perpendicular to the swing shafts (26), the large connecting rods (27) are provided with two nuts, and the two nuts are respectively positioned at two sides of the swing shafts (26);
the rolling main machine comprises a base (28), a rack front fixing seat (29) and a rack rear fixing seat (30), wherein a sliding table (31) is arranged on the base (28), sliding supporting blocks (32) corresponding to the sliding table (31) are arranged on the left side and the right side of the rack front fixing seat (29) and the rack rear fixing seat (30), a side limiting plate (33) is fixedly connected to the outer side of the sliding table (31), a top limiting plate (34) is fixedly arranged on the upper surface of the side limiting plate (33), the sliding table (31), the side limiting plate (33) and the top limiting plate (34) are matched together to limit and compress the sliding supporting blocks (32), connecting parts (35) are arranged on the left side and the right side of the rack rear fixing seat (30), and a rack sleeve (36) is arranged in the rack front fixing seat (29) and the rack rear fixing seat (30), a push plate (37) is arranged at the rear end of the uppermost part of the rack sleeve (36), a second sliding groove (38) is arranged on the push plate (37), a second sliding block (39) is arranged in the second sliding groove (38), a fixed block (40) is arranged at the upper part of the second sliding groove (38), an adjusting bolt (41) is inserted and arranged on the fixed block (40), one end of the adjusting bolt (41) is fixedly connected with the second sliding block (39), the other end of the adjusting bolt (41) is in threaded connection with an adjusting nut, a roller holding collet chuck (42) is arranged in the rack sleeve (36), a sleeve limiting block (43) is fixedly arranged at the rear part of the roller holding collet chuck (42), an end cover (44) is fixedly arranged at the front end of the roller holding collet chuck (42), and the rack sleeve (36) is positioned between the sleeve limiting block (43) and the end cover (44), the roller holding collet chuck is characterized in that a roller holding collet (45) is arranged in the roller holding collet chuck (42), the roller holding collet (45) is of a six-jaw structure which is uniformly arranged, transmission arms (46) which are bilaterally symmetrical about a rolling line are arranged on the rear end face of the roller holding collet (45), a first holder (47) and a second holder (48) are clamped on the roller holding collet (45), six slide seat mounting grooves (49) are uniformly formed in opposite faces of the first holder (47) and the second holder (48), a slide seat (50) is arranged between the first holder (47) and the second holder (48), the slide seat (50) is arranged in the slide seat mounting grooves (49), the slide seat (50) is respectively positioned between the six jaws of the roller holding collet chuck (45), and limiting plates (51) are respectively arranged between the slide seat (50) and the first holder (47) and the second holder (48), in order to realize the axial fixation between the sliding seat (50) and the first retainer (47) and the second retainer (48), one side of the sliding seat limiting plate (51) far away from the circle center of the first retainer (47) is fixedly connected with a sliding seat limiting block (52) through a screw, so as to clamp the sliding seat (50), realize the fixation of the sliding seat (50) on the diameter direction of the first retainer (47), the sliding seat (50) is provided with an arc-shaped sliding way, a roller (53) is arranged in the arc-shaped sliding way, a roller limiting block (54) is arranged between two adjacent rollers (53), two adjacent surfaces of the two adjacent roller limiting blocks (54) are parallel to each other, the rear end surface of the roller retaining collet (45) is provided with a cover plate (55), the second retainer (48), the roller limiting block (54), the first retainer (47) and the roller retaining collet (45) are fixedly connected together through bolts, a wedge mounting groove is arranged at the position, corresponding to the sliding seat (50), on the roller holding collet chuck (42), a roller adjusting upper wedge (56) and a roller adjusting lower wedge (57) which are oppositely arranged are arranged in the wedge mounting groove, the roller adjusting upper wedge (56) is fixedly connected with the frame sleeve (36) through an upper wedge locking screw (58), a wedge adjusting axial bolt (59) is arranged at the side surface of the roller adjusting lower wedge (57), the other end of the wedge adjusting axial bolt (59) penetrates through an end cover (44) to be connected with a nut, a slide hole is arranged at the position, corresponding to the upper wedge locking screw (58), on the roller adjusting lower wedge (57), for the sliding of the roller adjusting lower wedge (57), and the adjustment of the roller (53) and the sliding seat (50) is realized through the sliding of the roller adjusting lower wedge (57), a reasonable hole pattern is finally formed, and rolling central holes for passing through the pipe are formed in the roller holding collet (45), the first retainer (47), the second retainer (48) and the cover plate (55);
a second pin shaft (16) on a transmission connecting rod (15) in the transmission mechanism is connected with a connecting part (35) on a rear fixed seat (30) of a middle stand of the rolling main machine, a large connecting rod (27) in the swing arm mechanism is hinged with a second sliding block (39) on a middle stand sleeve (36) of the rolling main machine, and a small connecting rod (22) in the swing arm mechanism is hinged with a transmission arm (46) on a roller holding collet (45) in the rolling main machine.
2. The six-roller cold rolling mill for the difficult-to-deform metal seamless pipe as claimed in claim 1, is characterized in that: one of the two sliding tables (31) is a triangular sliding table (31) so as to guide the rack.
3. The six-roller cold rolling mill for the difficult-to-deform metal seamless pipe as claimed in claim 1, is characterized in that: and sliding plates (60) are arranged on the contact surfaces of the sliding support blocks (32), the sliding table (31), the side limiting plate (33) and the top limiting plate (34).
4. The six-roller cold rolling mill for the difficult-to-deform metal seamless pipe as claimed in claim 1, is characterized in that: and a second reinforcing rod (61) is arranged at the lower part of the rocker (19).
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| CN202010990633.7A CN112222191B (en) | 2020-09-19 | 2020-09-19 | Six-roller cold rolling mill for difficult-to-deform metal seamless pipe |
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| CN202010990633.7A CN112222191B (en) | 2020-09-19 | 2020-09-19 | Six-roller cold rolling mill for difficult-to-deform metal seamless pipe |
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| CN112222191B CN112222191B (en) | 2022-09-23 |
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| CN112222191B (en) | 2022-09-23 |
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