CN102861766A - Square tube rolling device, square tube sizing mill with same and production method of square tube - Google Patents
Square tube rolling device, square tube sizing mill with same and production method of square tube Download PDFInfo
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- CN102861766A CN102861766A CN201210351598XA CN201210351598A CN102861766A CN 102861766 A CN102861766 A CN 102861766A CN 201210351598X A CN201210351598X A CN 201210351598XA CN 201210351598 A CN201210351598 A CN 201210351598A CN 102861766 A CN102861766 A CN 102861766A
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Abstract
The invention provides a square tube rolling device, a square tube sizing mill with the same and a production method of a square tube. The square tube rolling device comprises a rack and three groups of roll parts, wherein each group of roll parts is provided with an active moving roll; all the rolls are arranged on the rack; three rolls in the three groups of roll parts include a first roll, a second roll and a third roll; axes of all the rolls are intersected in the same plane; and roll grooves of all the rolls are combined to form a square hole. Three rolls of the square tube rolling device are all drive rolls, so that all rolls have the deformation capacity greater than that of the traditional one-roll drive or two-roll drive, and the rolling deformation of a thick wall steel tube and an ultra-thick wall steel tube can be satisfied; in the hot pressing process, four side walls of the square hole are in contact with a hot circular tube after sizing, wherein the square hole is formed by combining the roll grooves of all the rolls, and the rolling force is further transmitted to all parts of the circular tube, and thus the square tube with precise size and better mechanical properties is obtained.
Description
Technical field
The present invention relates to field of metallurgy, in particular to a kind of square tube roll device, the surely square machine of square tube that contains this device and the production method of square tube.
Background technology
Square tube is a kind of address of square pipe.As a kind of steel of economical and efficient, be mainly used in the engineering construction field, comprise the fields such as steel house, main building, boiler steelframe, urban construction and machine-building.At present, a collection of steel house pilot and demonstration projects have been built on the ground such as Beijing, Tianjin, Shanghai, are that wherein side's (square) effective amount accounts for more than 50% of section bar total amount of building industry by the clean steel system of side's (square) tubing string and the combination of H shaped steel cross section.
At present, the square tube production technology mainly contain welding, coldly push away, cold-drawn or cold rolling.The welding square tube is to adopt the clod wash straight forming method of moving in bending radius, the flexural center of decide, and utilize high frequency electric the collection skin, close on, attract, the principle of mutual inductance by force, it is 90 ° wedge angle square tube that Plate Welding one-tenth is had a weld seam and angle.Physical dimension, mechanical property, chemical composition and the metallographic structures etc. of the square tube commissure that the employing welding procedure is produced are difficult to parent in full accord, and its mechanical performance is poor than fertile material, is not suitable for the construction steel house.
Coldly push away, cold-drawn or cold rolling square tube be take hot rolling or welding hollow billet as raw material, the square tube of producing except the laggard row drawing of descale or rolling cold deformation through pickling.For the plastic deformation of metal, a specific temperature is arranged recrystallization temperature, be higher than and carry out deformation processing under this temperature and just be called thermal processing distortion, being lower than this temperature processing is exactly cold deformation.As long as plastic deformation is arranged, will produce the work hardening phenomenon.Coldly push away, cold-drawn or cold rolling square tube be exactly a kind of mode of cold deformation, in the cold deformation process, there is not recrystallization process, can not alleviate serious work hardening phenomenon, and the work hardening phenomenon increases metal resistance of deformation in plastic history gradually, even the ability that forfeiture continues to be out of shape causes cracking; The work of deformation fraction is retained in metal inside after the cold working, forms residual stress.The existence of residual stress makes the FREE TORSION rigidity in its cross section lower, easily occurs reversing when curved being subjected to, and easily occurs crooked torsional buckling during pressurized, and torsional property is relatively poor; And the cold deformation mode only can produce the square tube of little wall thickness, in the again not thickening of corner that plate connects, bears a little less than the ability of load of locality; Simultaneously, the flow harden that the continuous cold distortion causes descends the intensity of square tube and hardness rising, the tough index of moulding, and causes the impact property of square tube to worsen.This shows, the existing square tube that adopts the modes such as welding, cold deformation to produce, because the problem such as do not solve simultaneously that mechanical performance uniformity, torsional property are poor, the ability of the load of bearing locality is weak and impact property is poor, fail to be used widely at building field, especially can not be applicable to the skyscraper field.
Hot rolling square tube is a kind of thermal processing distortion process to steel pipe, because hot-working is in the plastic deformation that is higher than more than the recrystallization temperature, so the softening process that the hardening process that causes because of plastic deformation and recovery and recrystallization cause almost exists simultaneously and cancels out each other, and hot-working can make some defective such as pore and loose seam in the hollow billet, eliminate the part segregation, make grain refinement, improve the form of field trash or fragility phase and distribution etc., its result can improve compactness, plasticity and the toughness of hot rolling square tube.Because there are not the processes such as pickling in hot rolling square tube, the pipe behind the tube rolling is directly carried out the hot rolling sizing simultaneously, its production efficiency is apparently higher than the production efficiency of cold deformation square tube.
The present invention improves the three roller sizing mills that are used at present the pipe sizing, has realized utilizing the purpose of the seamless hot rolling fabrication techniques hot rolling square tube of three roller sizing mills.
Summary of the invention
The present invention aims to provide a kind of square tube roll device, contains the surely square machine of square tube of this device and the production method of square tube, realizes the purpose of the square tube of manufacturing machine better performances.
To achieve these goals, according to an aspect of the present invention, a kind of square tube roll device is provided, the square tube roll device comprises: frame, and three groups of roll sections, every group of roll section all has the roll of an active movement, each roll all is arranged on the frame, three rolls in three groups of roll sections comprise the first roll, the second roll and the 3rd roll, and the axis of each roll intersects in same plane, and form square opening after the combination of the knurling of each roll.
Further, the axis along continuous straight runs of above-mentioned the first roll arranges, and the knurling of the first roll comprises first horizontal side wall and two the first upright side walls that link to each other with the two ends of the first horizontal side wall respectively of an along continuous straight runs, the first horizontal side wall forms the sidewall of a level of square opening, and two the first upright side walls form respectively the part of two vertical sidewalls of square opening; The knurling of the second roll and the 3rd roll is symmetrical arranged and the axes intersect of each roll forms equilateral triangle along the perpendicular bisector of the knurling of the first roll, the knurling of the second roll has second horizontal side wall and second upright side walls, the knurling of the 3rd roll has the 3rd horizontal side wall and the 3rd upright side walls, the second horizontal side wall and the 3rd horizontal side wall form the sidewall of another level of square opening, and the second upright side walls and the 3rd upright side walls form the remainder of two vertical sidewalls of square opening.
Further, above-mentioned the first horizontal side wall, the first upright side walls, the second horizontal side wall, the second upright side walls, the 3rd horizontal side wall and the 3rd upright side walls are curved wall.
Further, each above-mentioned roll section also comprises: driving shaft, be arranged on the frame along the axis of roll, and roll is arranged on the driving shaft; To the power transmission of driving shaft transmitting power, be arranged on an end that stretches out frame of driving shaft.
Further, each above-mentioned roll section also comprises: inner spline housing, with the external splines key tooth engagement of driving shaft; Safety collar, an end is connected with inner spline housing, and the other end is connected with power transmission.
Further, each above-mentioned roll section also comprises: clutch shaft bearing is positioned at roll away from a side of power transmission and is arranged on the driving shaft; The second bearing, be positioned at roll close power transmission a side and be arranged on the driving shaft outer wall interference fit of the inwall of the second bearing and driving shaft; Positioning sleeve is arranged between clutch shaft bearing and the driving shaft, the inwall interference fit of the outer wall of positioning sleeve and clutch shaft bearing.
According to a further aspect in the invention, provide a kind of square tube surely square machine, the surely square machine of square tube comprises one or a plurality of square tube roll devices of arranging along the tubing throughput direction, and the square tube roll device is above-mentioned square tube roll device.
Further, the surely square machine of above-mentioned square tube comprises a plurality of square tube roll devices of arranging along the tubing throughput direction, and four sidewalls of the square opening at least one or a plurality of square tube roll device are curved wall.
Further, four sidewalls of the square opening in the surely square machine of above-mentioned square tube in a plurality of square tube roll devices are curved wall, and these a plurality of square tube roll devices are from upstream to the curved wall in downstream along the tubing throughput direction radius of curvature becomes large successively.
Further, above-mentioned square tube roll device is four, and the total reduction of four square tube roll devices is between 12～21%, and the reduction ratio of each square tube roll device is between 2～7%.
Further, the surely square machine of above-mentioned square tube also comprises one or more pipe roll devices, be arranged on the square tube roll device along the throughput direction of tubing before.
According to another aspect of the invention, a kind of production method of square tube is provided, production method comprises heating of pipe blank step, perforation step, tube rolling step, sizing step and decides measured step rapid, and the sizing step comprises that the one or more pipe roll devices of employing carry out sizing, form pipe; Decide measured step and comprise that suddenly the pipe that the sizing step is formed is surely square by the surely square machine of above-mentioned square tube, form square tube.
Further, the external diameter of above-mentioned pipe is D, and the girth of square tube is L, decide measured step rapid in peripheral compressed coefficient η be 1.06～1.14, and η=π * D/L.
Further, above-mentioned perforation step adopts the conic perforator perforation, and tube rolling adopts tandem mill rolling.
Further, the external diameter of the hollow billet by above-mentioned conic perforator is Φ 247mm, Φ 336mm or Φ 410mm; And external diameter be the hollow billet of Φ 247mm rolling by tandem mill be the hollow forging of Φ 210mm for external diameter, external diameter be the hollow billet of Φ 336mm rolling by tandem mill be the hollow forging of Φ 293mm for external diameter, external diameter be the hollow billet of Φ 410mm rolling by tandem mill be the hollow forging of Φ 364mm for external diameter.
Further, when the specification of producing above-mentioned square tube is 200 * 200mm, decide the rapid square tube that adopts of measured step surely the square tube roll device of square machine be four, and the radius of curvature of curved wall that is from upstream to four square tube roll devices in downstream along the throughput direction of tubing is followed successively by 233mm, 408mm, 1176mm and 3000mm, and the unit reduction ratio is followed successively by 2.51%, 6.52%, 5.6% and 4.47%.
Three rolls of square tube roll device of the present invention are drive roll, so that a more traditional roller transmission or the two roller transmissions of each roll have larger deformability, can satisfy the rolling deformation of thick walled steel tube and extra strong pipe; In course of hot rolling, four sidewalls of the square opening that forms after the knurling of each roll combination contact with the hot pipe behind the sizing, further roll-force are transferred to each position of pipe, obtain the superior square tube with better mechanical property of size.And, compare with present cold-rolling process, adopt to have the square tube roll device production square tube of said structure, improved to a great extent output and the production efficiency of square tube, reduced simultaneously production cost.Above-mentioned square tube roll device can design the shape of the knurling of three roller pipe sizing mills commonly used at present in the manner described above, thereby has further reduced production cost.
Description of drawings
The Figure of description that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows the side view of square tube roll device of the present invention;
The A-A that Fig. 2 shows square tube roll device shown in Figure 1 to cutaway view;
Fig. 3 shows the structural representation of the knurling of the first roll shown in Figure 1, the second roll and the 3rd roll;
Fig. 4 shows the surely structural representation of square machine of square tube of the present invention; And
Fig. 5 shows square tube production technological process of the present invention.
The specific embodiment
Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
As depicted in figs. 1 and 2, in a kind of typical embodiment of the present invention, a kind of square tube roll device is provided, this square tube roll device comprises frame 1 and three groups of roll sections, every group of roll section all has the roll of an active movement, and each roll all is arranged on the frame 1, and three rolls in three groups of roll sections comprise the first roll 21, the second roll 22 and the 3rd roll 23, the axis of each roll intersects in same plane, and forms square opening after the combination of the knurling of each roll.
Square tube roll device with said structure, three rolls are drive roll, so that a more traditional roller transmission or the two roller transmissions of each roll have larger deformability, can satisfy the rolling deformation of thick walled steel tube and extra strong pipe; In course of hot rolling, four sidewalls of the square opening that forms after the knurling of each roll combination contact with the hot pipe behind the sizing, further roll-force are transferred to each position of pipe, obtain the superior square tube with better mechanical property of size.And, compare with present cold-rolling process, adopt to have the square tube roll device production square tube of said structure, improved to a great extent output and the production efficiency of square tube, reduced simultaneously production cost.Above-mentioned square tube roll device can design the shape of the knurling of three roller pipe sizing mills commonly used at present in the manner described above, thereby has further reduced production cost.
As shown in Figure 3, in a kind of preferred embodiment of the present invention, the axis along continuous straight runs of the first roll 21 of above-mentioned square tube roll device arranges, and the knurling of the first roll 21 comprises first horizontal side wall and two the first upright side walls that link to each other with the two ends of horizontal side wall respectively of an along continuous straight runs, the first horizontal side wall forms the sidewall of a level of square opening, and two the first upright side walls form respectively the part of two vertical sidewalls of square opening; The knurling of the second roll 22 and the 3rd roll 23 is symmetrical arranged and the axes intersect of each roll forms equilateral triangle along the perpendicular bisector of the knurling of the first roll 21, the knurling of the second roll 22 has second horizontal side wall and second upright side walls, the knurling of the 3rd roll 23 has the 3rd horizontal side wall and the 3rd upright side walls, the second horizontal side wall and the 3rd horizontal side wall form the sidewall of another level of square opening, and the second upright side walls and the 3rd upright side walls form the remainder of two vertical sidewalls of square opening.
The first roll 21 of the present invention, the direction that the extended line of the axis of the second roll 22 and the 3rd roll 23 intersects each limit of the equilateral triangle that forms has multiple, a preferred leg-of-mutton edge horizontal direction arranges, the axis along continuous straight runs that is about to the first roll 21 arranges, and preferably its knurling employing structure setting as shown in Figure 3, the structure of the knurling of the structure of the knurling of the second roll 22 and the 3rd roll 23 as shown in Figure 3, certainly, the shape of the knurling of each roll is not limited only to shape illustrated in fig. 3, as long as can form the square opening of approximate sealing after the combination of the knurling of each roll.
In order to obtain better effect of rolling, preferred the first horizontal side wall, the first upright side walls, the second horizontal side wall, the second upright side walls, the 3rd horizontal side wall and the 3rd upright side walls are curved wall.The sidewall of each knurling is set to curved wall, so that knurling and pipe have larger contact area, roll-force can be transferred on the rolling pipe more equably, has avoided in operation of rolling pipe unbalance stress to cause the drawback of undesirable distortion.
As shown in Figure 2, each roll section of square tube roll device of the present invention also comprises driving shaft 3 and to the power transmission 4 of driving shaft 3 transmitting powers, driving shaft 3 is arranged on the frame 1 along the axis of roll, and roll is arranged on the driving shaft 3; Power transmission 4 is arranged on an end that stretches out frame 1 of driving shaft 3.Each roll has the driving shaft corresponding with it 3 and power transmission 4, power transmission 4 realizations adjacent with reductor with power transmission to driving shaft 3, thereby further drive the roll that is arranged on the driving shaft 3.
In order to guarantee better being synchronized with the movement of driving shaft 3 and roll, driving shaft 3 preferably passes through spline joint with roll.
As shown in Figure 2, each roll section of square tube roll device also comprises inner spline housing 5 and safety collar 6, and inner spline housing 5 meshes with the external splines key tooth of driving shaft 3; One end of safety collar 6 is connected with inner spline housing 5, and the other end is connected with power transmission 4.By safety collar 6 and inner spline housing 5 power synchronous that power transmission 4 transmits is transferred to driving shaft 3, has further guaranteed the stability of square tube sizing mill work.
As shown in Figure 2, each roll section of square tube roll device also comprises clutch shaft bearing 7, second bearing 8 and the positioning sleeve 9 corresponding with each roll 2, and clutch shaft bearing 7 is positioned at roll 2 away from a side of power transmission 4 and is arranged on the driving shaft 3; The second bearing 8 be positioned at roll 2 close power transmission 4 a side and be arranged on the driving shaft 3 the outer wall interference fit of the inwall of the second bearing 8 and driving shaft 3; Positioning sleeve 9 is arranged between clutch shaft bearing 7 and the driving shaft 3, the inwall interference fit of the outer wall of positioning sleeve 9 and clutch shaft bearing 7.Adopt bearings driving shaft 3, more be conducive to the motion of driving shaft 3.Clutch shaft bearing cover the 71 and second bearing holder (housing, cover) 81 is set respectively in the outside of clutch shaft bearing 7 and the second bearing 8.
As shown in Figure 4, in the another kind of typical embodiment of the present invention, also provide a kind of square tube surely square machine, one or a plurality of square tube roll devices 200 of arranging along the tubing throughput direction, this square tube roll device 200 is above-mentioned square tube roll device.Square tube with said structure surely effect of square machine is that pipe is rolled into square tube by square tube roll device of the present invention with pipe.
In another kind of preferred embodiment of the present invention, the surely square machine of square tube comprises a plurality of square tube roll devices 200 of arranging along the tubing throughput direction, and four sidewalls of the square opening at least one or a plurality of square tube roll device 200 are curved wall.When the square tube roll device 200 that employing has a curved wall carries out tube rolling, the deformation performance of pipe accesses preferably control, can adopt the square tube roll device 200 that has close to the sidewall on plane to carry out further rolling deformation when pipe levels off to square tube.
Utilize in the surely square process of the surely square machine of square tube of the present invention, pipe is gradually by circle change side, in order to adapt to this change procedure, preferably, in the surely square machine of square tube four sidewalls of the square opening in a plurality of square tube roll devices 200 being arranged is curved wall, and these a plurality of square tube roll devices 200 are from upstream to the curved wall in downstream along the tubing throughput direction radius of curvature becomes large successively.And, those skilled in the art can simulate deformation process by finite element, concrete operations can for: at first, the border conditions such as the single chassis reduction ratio of setting pipe specification, deformation temperature, square tube frame, rate of deformation, coefficient of friction, finished product square tube specification, by finite element software deformation process is simulated again, at last, obtain rational curved wall radius of curvature.
In a kind of specific embodiment of the present invention, the square tube roll device 200 of above-mentioned square tube sizing mill is four, and the total reduction of four square tube roll devices 200 is between 12～21%, and the reduction ratio of each square tube roll device 200 is between 2～7%.
The reduction ratio of each square tube roll device 200 is controlled between 2～7%, the total reduction of four square tube roll devices 200 is controlled between 10～21%, avoided the appearance of the problem of the excessive dimensional accuracy that causes finished product of distortion in the Sizing Process and resistance to torsion variation.
As shown in Figure 4, the surely square machine of above-mentioned square tube also comprises one or more pipe roll devices 100, before these one or more pipe roll devices 100 are arranged on square tube roll device 200 along the throughput direction of tubing.Pipe roll device 100 makes up with square tube roll device 200 continuous rolling, the production of being convenient to realize square tube is set.Pipe roll device 100 in the above-mentioned fixed square machine directly adopts the pipe roll device in the existing pipe sizing mill to get final product.
As shown in Figure 5, in another typical embodiment of the present invention, a kind of production method of square tube also is provided, aforementioned production method comprises heating of pipe blank step, perforation step, tube rolling step, sizing step and decides measured step rapid, the sizing step comprises that the one or more pipe roll devices 100 of employing carry out sizing, form pipe; Decide measured step and comprise that suddenly the pipe that the sizing step is formed is surely square by the surely square machine of above-mentioned square tube, form square tube.
Adopt the production method of above-mentioned square tube, to adopt pipe roll device 100 to carry out obtaining pipe behind the sizing through the hot rolling hollow forging of hot rolling, then adopt the surely square machine of square tube of the present invention to carry out the side of deciding and obtained hot rolling square tube, avoid the problem that intensity, hardness are higher, toughness plasticity is lower of cold rolling square tube, had preferably impact property; And, adopt above-mentioned production technology can realize consecutive production, production efficiency is higher.
Adopt square tube surely the square tube roll device 200 of square machine with pipe surely in the process of side, pipe is in the process by circle change side, the girth of square tube diminishes, wall thickness approximately thickens about 5%, in order to obtain the comparatively accurate square tube of physical dimension, the external diameter of preferred pipe is D, and the girth of square tube is L, decide measured step suddenly in peripheral compressed coefficient η be 1.06～1.14 and satisfy η=π * D/L.
The production method middle punch step of above-mentioned square tube adopts the conic perforator perforation, and tube rolling adopts tandem mill rolling.Conic perforator and tandem mill coordinating operation not only can obtain mechanical performance more uniformity, square tube that resistance to torsion is stronger, and can improve the production efficiency of square tube, realize the extensive High-efficient Production of square tube.
When adopting above-mentioned production technology production square tube, preferably the external diameter of the hollow billet by conic perforator is Φ 247mm, Φ 336mm and Φ 410mm; And external diameter be the hollow billet of Φ 247mm rolling by tandem mill be the hollow forging of Φ 210mm for external diameter, external diameter be the hollow billet of Φ 336mm rolling by tandem mill be the hollow forging of Φ 293mm for external diameter, external diameter be the hollow billet of Φ 410mm rolling by tandem mill be the hollow forging of Φ 364mm for external diameter.
In a kind of preferred embodiment of the present invention, when production specification is the square tube of 200 * 200mm, deciding the rapid square tube roll device 200 that adopts of measured step is four, and the radius of curvature of curved wall that is from upstream to four square tube roll devices 200 in downstream along the throughput direction of tubing is followed successively by 233mm, 408mm, 1176mm and 3000mm, and the unit reduction ratio is followed successively by 2.51%, 6.52%, 5.6% and 4.47%.When adopting above-mentioned square tube roll device 200 to carry out fixed side, those skilled in the art can select the pipe behind the suitable sizing carry out the side of deciding according to η=principle of π * D/L and about 5% buildup thickness.
Below with reference to embodiment and Comparative Examples, further specify beneficial effect of the present invention.
The production of the square tube of the present invention take specification as 200 * 200 * 45mm describes of the present invention as example, belong to external diameter greatly and the square tube of the ideal format that wall thickness is thicker because specification is the square tube of 200 * 200 * 45mm, have larger production difficulty and representativeness.
Be the blank preheating of 280mm with external diameter, then adopt five sections heating in annular furnace, heating one section temperature is 1020 ℃ ± 10 ℃, and heating two sections temperature is 1160 ℃ ± 10 ℃, heating three sections temperature is 1250 ℃ ± 10 ℃, and heating four and five sections temperature is 1290 ℃ ± 10 ℃; Then 1280 ℃ ± 10 ℃ soaking, be 3.5h total heat time heating time.
Adopt the conic perforator perforation to obtain the hollow billet that specification is Φ 336 * 50mm the blank after the soaking; Then adopt tandem mill to be rolled into the hollow forging that specification is Φ 280 * 42mm this hollow billet; Adopt the pipe roll device of 247 series to carry out sizing hollow forging and obtain the pipe that specification is Φ 247 * 43mm; Then make above-mentioned pipe undertaken the side of deciding by four square tube roll devices successively, obtaining specification is the seamless hot rolling square tube of 200 * 200 * 45mm, and specification and the rotating speed of the square tube roll device that the sequencing that passes through by pipe is arranged see Table 1.
Table 1
Choose any two embodiment 1 square tubes, and test their physical dimension and the mechanical property under the room temperature, the physical dimension test result sees Table 2, and mechanical experimental results sees Table 3.
Table 2
Table 3
Can be found out that by the data in table 2 and the table 3 the various physical dimensions of the square tube that obtains by production method of the present invention and the requirement that mechanical property all can satisfy European EN10210 standard can be used as square tube for building fully and use.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. a square tube roll device is characterized in that, described square tube roll device comprises:
Frame (1);
Three groups of roll sections, every group of roll section all has the roll of an active movement, each described roll all is arranged on the described frame (1), three rolls in three groups of roll sections comprise the first roll (21), the second roll (22) and the 3rd roll (23), the axis of each described roll intersects in same plane, and forms square opening after the combination of the knurling of each described roll.
2. square tube roll device according to claim 1 is characterized in that,
The axis along continuous straight runs of described the first roll (21) arranges, and the knurling of described the first roll (21) comprises first horizontal side wall and two the first upright side walls that link to each other with the two ends of described the first horizontal side wall respectively of an along continuous straight runs, described the first horizontal side wall forms the sidewall of a level of described square opening, and two described the first upright side walls form respectively the part of two vertical sidewalls of described square opening;
The knurling of described the second roll (22) and described the 3rd roll (23) is symmetrical arranged and the axes intersect of each described roll forms equilateral triangle along the perpendicular bisector of the knurling of described the first roll (21), the knurling of described the second roll (22) has second horizontal side wall and second upright side walls, the knurling of described the 3rd roll (23) has the 3rd horizontal side wall and the 3rd upright side walls, described the second horizontal side wall and the 3rd horizontal side wall form the sidewall of another level of described square opening, and described the second upright side walls and described the 3rd upright side walls form the remainder of two vertical sidewalls of described square opening.
3. square tube roll device according to claim 1 is characterized in that, described the first horizontal side wall, the first upright side walls, the second horizontal side wall, the second upright side walls, the 3rd horizontal side wall and the 3rd upright side walls are curved wall.
4. each described square tube roll device in 3 according to claim 1 is characterized in that, each described roll section also comprises:
Driving shaft (3) is arranged on the described frame (1) along the axis of described roll, and described roll is arranged on the described driving shaft (3);
To the power transmission (4) of described driving shaft (3) transmitting power, be arranged on an end that stretches out described frame (1) of described driving shaft (3).
5. square tube roll device according to claim 4 is characterized in that, each described roll section also comprises:
Inner spline housing (5) is with the external splines key tooth engagement of described driving shaft (3);
Safety collar (6), an end is connected with described inner spline housing (5), and the other end is connected with described power transmission (4).
6. square tube roll device according to claim 4 is characterized in that, each described roll section also comprises:
Clutch shaft bearing (7) is positioned at described roll away from a side of described power transmission (4) and is arranged on the described driving shaft (3);
The second bearing (8), be positioned at described roll close power transmission (4) a side and be arranged on the described driving shaft (3) the outer wall interference fit of the inwall of described the second bearing (8) and described driving shaft (3);
Positioning sleeve (9) is arranged between described clutch shaft bearing (7) and the described driving shaft (3) the inwall interference fit of the outer wall of described positioning sleeve (9) and described clutch shaft bearing (7).
7. surely square machine of square tube, it is characterized in that, the surely square machine of described square tube comprises one or a plurality of square tube roll devices (200) of arranging along the tubing throughput direction, and described square tube roll device (200) is each described square tube roll device in the claim 1 to 6.
8. the surely square machine of square tube according to claim 7, it is characterized in that, the surely square machine of described square tube comprises a plurality of square tube roll devices (200) of arranging along the tubing throughput direction, and four sidewalls of the square opening at least one or a plurality of square tube roll device (200) are curved wall.
9. the surely square machine of square tube according to claim 8, it is characterized in that, four sidewalls of the square opening in the surely square machine of described square tube in a plurality of square tube roll devices (200) are curved wall, and these a plurality of square tube roll devices (200) are from upstream to the curved wall in downstream along the tubing throughput direction radius of curvature becomes large successively.
10. the surely square machine of square tube according to claim 9, it is characterized in that, described square tube roll device (200) is four, and the total reduction of four described square tube roll devices (200) is between 12～21%, and the reduction ratio of each described square tube roll device (200) is between 2～7%.
11. the surely square machine of each described square tube in 10 according to claim 7, it is characterized in that, the surely square machine of described square tube also comprises one or more pipe roll devices (100), is arranged on described square tube roll device (200) before along the throughput direction of described tubing.
12. the production method of a square tube is characterized in that, described production method comprises heating of pipe blank step, perforation step, tube rolling step, sizing step and decides measured step rapid,
Described sizing step comprises that the one or more pipe roll devices of employing (100) carry out sizing, form pipe;
Describedly decide measured step and suddenly comprise and make pipe that described sizing step forms by the fixed side of the surely square machine of each described square tube in the claim 7 to 10, form square tube.
13. production method according to claim 12 is characterized in that, the external diameter of described pipe is D, and the girth of described square tube is L, described decide measured step rapid in peripheral compressed coefficient η be 1.06～1.14, and η=π * D/L.
14. production method according to claim 12 is characterized in that, described perforation step adopts the conic perforator perforation, and described tube rolling adopts tandem mill rolling.
15. each described production method in 14 is characterized in that according to claim 12, the external diameter of the hollow billet by described conic perforator is Ф 247mm, Ф 336mm or Ф 410mm; And external diameter be the hollow billet of Ф 247mm rolling by described tandem mill be the hollow forging of Ф 210mm for external diameter, external diameter be the hollow billet of Ф 336mm rolling by described tandem mill be the hollow forging of Ф 293mm for external diameter, external diameter be the hollow billet of Ф 410mm rolling by described tandem mill be the hollow forging of Ф 364mm for external diameter.
16. each described production method in 14 according to claim 12, it is characterized in that, when the specification of producing described square tube is 200 * 200mm, described decide the rapid square tube that adopts of measured step surely the square tube roll device (200) of square machine be four, and the radius of curvature of curved wall that is from upstream to four described square tube roll devices (200) in downstream along the throughput direction of described tubing is followed successively by 233mm, 408mm, 1176mm and 3000mm, and the unit reduction ratio is followed successively by 2.51%, 6.52%, 5.6% and 4.47%.
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| CN103316916A (en) * | 2013-06-24 | 2013-09-25 | 衡阳华菱钢管有限公司 | Square tube former and production method of square tubes |
| CN104128373A (en) * | 2014-08-12 | 2014-11-05 | 无锡市瑞尔精密机械股份有限公司 | Novel machine set for producing hot rolling seamless square steel pipe |
| CN105798066A (en) * | 2016-05-10 | 2016-07-27 | 沈阳重机重矿机械设备制造有限公司 | Cantilever Y-shaped rolling mill |
| CN109226267A (en) * | 2018-07-14 | 2019-01-18 | 大连冶金工具厂有限公司 | A kind of round tube becomes the milling method and its pass structure of square tube |
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| WO2020015555A1 (en) * | 2018-07-17 | 2020-01-23 | 欣诺冷弯型钢产业研究院（曹妃甸）有限公司 | Corner-thickened cold/hot composite formation square/rectangular pipe forming system |
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| CN109702014A (en) * | 2018-12-25 | 2019-05-03 | 衡阳华菱钢管有限公司 | The fixed square device of Trailer car shaft, Trailer car shaft and preparation method thereof |
| CN109706393A (en) * | 2018-12-25 | 2019-05-03 | 衡阳华菱钢管有限公司 | Low temperature environment Trailer car shaft and preparation method thereof |
| CN109706392A (en) * | 2018-12-25 | 2019-05-03 | 衡阳华菱钢管有限公司 | Trailer car shaft square tube, preparation method and Trailer car shaft |
| CN114733911A (en) * | 2022-04-15 | 2022-07-12 | 衡阳华菱钢管有限公司 | Pipe processing method |
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