CN204294627U - Bench - Google Patents

Abstract

The utility model provides a kind of bench, and for hollow billet is rolled into hollow forging, described bench comprises: lathe bed (5), is arranged on roll line; Multiple roller die, is disposed in parallel in lathe bed (5); Necking machine (4), is positioned at the entrance of described lathe bed (5); Material feeding foreground (3), is positioned at the upstream of necking machine (4), bears the foreground supporting surface of hollow billet to be rolled; Trombone slide backstage (6), is positioned at the outlet of described lathe bed, and described trombone slide backstage (6) supports plug and hollow billet; Rack pinion system (7), is positioned at the downstream of described trombone slide backstage (6); Plug, connect described rack pinion system (7), and described plug can at material feeding foreground (3), necking machine (4) and lathe bed (5), carry out reciprocating linear between roller die (30) and trombone slide backstage (6) and move.The utility model lathe bed coefficient is less and do not have pressure bar stabilization sex chromosome mosaicism.

Description

Bench

Technical field

The utility model relates to field of metallurgy, is specifically related to a kind of three-high mill for rolling seamless steel pipe, especially a kind of bench.

Background technology

Current roll seamless steel tube can be divided into initiatively rolling and passive rolling by driving type, wherein initiatively rolling unit comprise MPM, PQF etc. two roller or three roller multi-frames continuous axial rolling and the unit such as the oblique milling of ASSEL tri-roller single chassis, the oblique milling of Accu Roll two roller single chassis; Passive rolling is CPE method (Cross-roll Piercing and Elongating) mainly, is that a kind of perforation oblique milling goes out hollow billet and after reducing, carrying out push pipe obtaining hollow forging and tube-rolling technique method through subtracting obtained fished pipe.This kind of method key is top system, and motor drives tooth bar by reductor, drives push rod to push plug, the obtained hollow forging in top.

One of corresponding above-mentioned CPE main pressure machining deformation equipment is push-bench, due to strut stability reason, the plug draw ratio (ratio of length and diameter) of this type is often restricted, the draw ratio of the push rod of coupling is restricted too, affects lathe bed coefficient to a certain extent.

Due to the restriction of maximum jacking force, frame of simultaneously nipping (roller die) number can not be too much, rolling roller die comparatively Large space is arranged, consider pressure bar stabilization sexual factor, spacing again can not be too large, but rolling pass (online roller die sum) must ensure technological requirement, often lathe bed is lengthened, cause plug or push rod to do length thus, push pipe tooth bar is corresponding growth also, thus makes equipment and instrument manufacture and produce spare part economical all not.

In sum, in prior art, there is following problem: at present in roll seamless steel tube, there is plug or push rod stability under loading difference and affect the problem of plug draw ratio.

Utility model content

The utility model provides a kind of bench, to solve in roll seamless steel tube, there is plug or push rod stability under loading difference and affects the problem of plug draw ratio.

For this reason, the utility model proposes a kind of bench, for hollow billet is rolled into hollow forging, described bench comprises:

Lathe bed, is arranged on roll line;

Multiple roller die, is disposed in parallel in lathe bed;

Necking machine, is positioned at the entrance of described lathe bed;

Material feeding foreground, is positioned at the upstream of necking machine, bears hollow billet to be rolled;

Trombone slide backstage, is positioned at the outlet of described lathe bed, described trombone slide background support plug and hollow billet;

Rack pinion system, is positioned at the downstream on described trombone slide backstage;

Plug, connects described rack pinion system, and described plug can on material feeding foreground, necking machine and lathe bed, carry out reciprocating linear between roller die and trombone slide backstage and move, and,

When plug is worn after rod puts in place in hollow billet, described rack pinion system pulls plug, makes described plug pull described hollow billet to move along same rolling direction, draws shaping, be rolled into hollow forging by described hollow billet.

Further, described bench also comprises: the positioning baffle being arranged on upstream, described material feeding foreground.

Further, described bench also comprises: the rise and fall roller being arranged on described positioning baffle upstream, and described positioning baffle is connected between described rise and fall roller and described material feeding foreground.

Further, described rack pinion system comprises: driving motor, the gear be connected with described driving motor, with the tooth bar of described gears meshing, wherein, described tooth bar is connected with described plug.

Further, described plug comprises: the head connected successively, excellent body and afterbody, the excellent body of described plug comprises two sections, be interconnective thick section and thin segment respectively, thick section is plug active section, and the length of thin segment is greater than lathe bed length, thick section and thin segment shaft shoulder place are the reducing position of plug, it is tapered that the head of plug is positioned at thick section termination, and the afterbody of described plug 9 is the clamping heads connected with tooth bar, and described clamping head is connected with described thin segment.

Further, described tooth bar comprises: with the tooth bar main body of gears meshing and the tooth bar head that is connected with described tooth bar main body, described tooth bar head is connected with described plug, wherein, described tooth bar head is positioned under described tooth bar main body, along the length direction of tooth bar, the top of described tooth bar main body has tooth engaged, and the bottom surface of described tooth bar head is straight.

Further, described trombone slide backstage has V-type roller-way, and on the section of vertical tooth rack length direction, the bottom surface of described tooth bar head is V-type.

Further, each roller die comprises three rolls, and three rolls are respectively around the respective driven rotation of rotation axis, and the angle between the rotation of three rolls is 60 °, roll in adjacent roller die is 60 ° of phase angle interlaced arrangement, realizes hollow billet circumferentially 60 ° of dislocation rollings.

Further, each roller die comprises three rolls, and three rolls are respectively around the respective driven rotation of rotation axis, and the angle between the rotation of three rolls is 60 °, adjacent roller die adopts 45 ° of phase angle dislocation to arrange, realizes hollow billet circumferentially 45 ° and the 30 ° dislocation rollings replaced.

The utility model is worn after rod puts in place in hollow billet at plug, and described rack pinion system pulls plug, makes described plug pull described hollow billet to move along same rolling direction, draws shaping, be rolled into hollow forging by described hollow billet.The utility model mode that " drawing " substitutes " pushing away " carries out tube rolling production, avoid the problem of the strut stability of the tools of production such as plug like this, the thrust that the pulling force that plug bears can bear much larger than it, thus the frame number (roller die) that makes will to nip greatly increases simultaneously, roller die adopts is close to layout, and lathe bed does shorter more economical, and lathe bed coefficient is less, the comparable push-bench of the maximum lengthening coefficient of bench is also large, is large elongating mill.

Because it is less that diameter of mandrel can do, so the hollow forging than existing push pipe more minor diameter can be produced, owing to not needing the orbit space (tooth bar need not pass lathe bed) reserving tooth bar bottom lathe bed as push pipe, therefore lathe bed is lower, is connected afer bay rigidity stronger with basis.Reason " pushes away " and becomes " drawing ", and the tile instrument of corresponding guarantee push rod and plug stability can also save, and also greatly saves the production time of changing product specification.

In same specification situation, the utility model can provide the roll-force larger than push-bench, and frame of simultaneously nipping number is more, provides larger percentage elongation, and does not have pressure bar stabilization sex chromosome mosaicism.

Accompanying drawing explanation

Fig. 1 is operation principle schematic diagram of the present utility model;

Fig. 2 is the structural representation of roll line of the present utility model;

Fig. 3 is the connected mode schematic diagram of tooth bar of the present utility model and plug;

Fig. 4 is the unfolding mode schematic diagram of tooth bar of the present utility model and plug;

Fig. 5 is the structural representation on material feeding foreground of the present utility model;

Fig. 6 is the structural representation of roller die of the present utility model and lathe bed;

Fig. 7 is six side's roller die schematic diagrames of the present utility model;

Fig. 8 is all directions of the present utility model roller die schematic diagram;

Fig. 9 is the structural representation of the first tooth bar of the utility model embodiment;

Figure 10 is the structural representation of the second tooth bar of the utility model embodiment;

Figure 11 is the structural representation of the third tooth bar of the utility model embodiment;

Figure 12 is the profile of tooth bar head of the present utility model.

Drawing reference numeral illustrates:

Tooth plate 30 roller die 31 roll 32 roll 33 roll 131 tooth bar main body 133 tooth bar head 50 rolling direction 60 hollow billet 65V forming roll road, suspension ring 27 briquetting 29 side, right suspension ring 24 roller die of the left suspension ring of suspension ring 22 23 25 positive suspension ring 26 side in pipe thread watt 18 short tube tile 20 roller dies 21 in 1 necking machine 5 lathe bed 6 trombone slide backstage 7, rise and fall roller 2 positioning baffle 3 material feeding foreground 4 rack pinion system 8 rack-track 9 plug 10 pinch roller rocking handle 11 locking bar 12 disc spring (folded spring) 13 tooth bar 14 guide plate 16 long tube tiles 17

Detailed description of the invention

In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and the utility model is described.

As shown in Figure 1, the utility model roll stand (roller die) adopts idler roller rolling (that is passive rolling), and plug pulls hollow billet along rolling direction 50 movement jointly, and plug 9 and hollow billet 60, through each roller die 30, are rolled into required hollow forging.Rod head takes chamfer design, is convenient to wear rod, and plug afterbody has bare terminal end, and the snap close for plug is fixed.

As shown in Figure 2, the utility model proposes a kind of bench, for hollow billet is rolled into hollow forging, bench comprises:

Lathe bed 5 (or being called base), is arranged on roll line, plays the effect of base, supports each roller die;

Multiple roller die 30 (three-high mill), is disposed in parallel in lathe bed 5;

Necking machine 4, be positioned at the entrance of described lathe bed 5, close up to hollow billet head, as better selection, necking machine 4 closes up to hollow billet 60 online, its center and hollow billet center conllinear, on same rolling line, adopt the reducing of hollow billet rolling line, shorten hollow billet perforation to tube rolling interval time, reduce heat radiation, be beneficial to trombone slide and carry out smoothly;

Material feeding foreground 3, be positioned at the upstream of necking machine 4, bear hollow billet to be rolled and ensure rolling line centering, from side direction, (side direction is the above-below direction Fig. 2 to hollow billet, roll line is the left and right directions in Fig. 2) enter material feeding foreground 3, material feeding foreground 3 height adjustable, makes to bear hollow billet to be rolled and ensures rolling line centering;

Trombone slide backstage 6, is positioned at the outlet of described lathe bed, and described trombone slide backstage 6 supports plug 9 and hollow billet 60, and before the rolling of trombone slide backstage 6, conveying plug, transports hollow forging after rolling, and its both sides are preheating plug material loading respectively, the hollow forging discharging of cored bar rolling; The roller-way on trombone slide backstage 6 can be elevated, and is used for accepting the plug of different-diameter and the hollow forging of different-diameter, and this meaning is elevated by a small margin, and this action realizes (also realizing by other mechanism) by the unified adjustment of spiral lift; After tooth bar 13 is come, need to dodge, realize significantly being elevated, this action is realized by independent hydraulic cylinder;

Rack pinion system 7, is positioned at the downstream on described trombone slide backstage 6, as the power resources of rolling;

Plug 9, connect described rack pinion system 7, and described plug can on material feeding foreground 3, necking machine 4 and lathe bed 5, carry out reciprocating linear between roller die 30 and trombone slide backstage 6 and move, as shown in Figure 1, when plug wear rod put in place in hollow billet after, described rack pinion system 7 pulls plug, makes described plug pull described hollow billet to move along same rolling direction, described hollow billet is drawn shaping, is rolled into hollow forging.

Wherein, in the application, tooth bar holds plug and sends to, through lathe bed 5, wears rod toward hollow billet, now wear rod and traditional push pipe rolling wear rod for plug diameter, to wear the aspects such as excellent strength identical.In the application, positioning baffle 2 backstop hollow billet afterbody, and have three of material feeding foreground tiles (long tube tile 16, middle pipe thread watt 17 and short tube tile 18) to be fixed hollow billet, and then wear rod under realizing hollow billet static state and put in place, thisly wear bar mode and former push pipe plug under hollow billet static state to penetrate the operation of wearing in advance that hollow billet puts in place be identical.

Further, as shown in Figure 2, described bench also comprises: the positioning baffle 2 being arranged on upstream, described material feeding foreground 3.Positioning baffle 2 locates the different hollow billet length of backstop, by hydraulic control cylinder stroke hollow billet is pushed into reducing position fixed dam and is close to hollow billet.

Further, as shown in Figure 2, described bench also comprises: the rise and fall roller 1 being arranged on described positioning baffle 2 upstream, described positioning baffle 2 is connected between described rise and fall roller 1 and described material feeding foreground 3.Rise and fall roller 1 in real time adjustment highly accepts different-diameter plug, makes plug center, hollow billet center aim at roller die center.

Further, described rack pinion system 7 comprises: driving motor, the gear be connected with described driving motor, with the tooth bar of described gears meshing, wherein, described tooth bar is connected with described plug.Rack pinion system 7, as the power resources of rolling, drives reductor by motor, and driven gear tooth bar, realize sending to and rollback of plug, thus draw hollow forging.

Further, described plug comprises: the head connected successively, excellent body and afterbody, the excellent body of described plug comprises two sections, and be interconnective thick section and thin segment respectively, thick section is plug active section, the length of thin segment is greater than lathe bed length, thick section and thin segment shaft shoulder place are the reducing position of plug, and it is tapered that the head of plug 9 is positioned at thick section termination, is beneficial to wear rod, the afterbody of described plug 9 is the clamping heads connected with tooth bar, and described clamping head is connected with described thin segment.

Rack-track 8 is positioned at the downstream of roll line rearmost end or transmission system 7, accepts the tooth bar run, or stops maintenance tooth bar.

As shown in Figure 2, the utility model rolling mill practice is: from boring a hole, the hollow billet of coming drops on material feeding foreground 3, hollow billet is located by positioning baffle 2, the roller-way on rise and fall roller 1 and trombone slide backstage 6 adjusts to core rod position, main driving motor driven wheel now in transmission system 7, make the tooth bar on rack-track 8 hold plug to send to, through lathe bed 5, rod is worn toward hollow billet, after putting in place, necking machine 4 pairs of hollow billet heads close up, and after this roller-way on trombone slide backstage 6 adjusts to hollow forging position, rack-and-pinion drags plug rollback, draws hollow forging.And then, trombone slide backstage transferred to by waste pipe racks rod, carries out the de-plumber's sequence of lower road pine rod.

As shown in Figure 9, tooth bar 13 adopts the straight-tooth of easily processing, and its head connects plug 9, and tooth bar 13 pairs of Gear shape process, this kind of scheme needs to allow trombone slide backstage roller-way avoid tooth surface of rack successively in the process of rolling.

Further, as shown in Figure 10, described tooth bar 13 comprises: with the tooth bar main body 131 of gears meshing and the tooth bar head 133 that is connected with described tooth bar main body, described tooth bar head 133 is connected with described plug 9, wherein, described tooth bar head 133 is positioned under described tooth bar main body 131, as shown in Figure 10, along the length direction of tooth bar, the top of described tooth bar main body 131 has the tooth engaged with gears meshing, the bottom of tooth bar main body 131 also has the tooth engaged with gears meshing, and the bottom surface of described tooth bar head 133 is straight.Tooth bar 13 can will be lifted in sleeping " L " shape like this, the tooth bar head connecting plug 9 does suitable optimization, thus makes trombone slide backstage roller-way need only accept plug or hollow forging in the process of rolling, need not avoid tooth surface of rack successively.

And then, as shown in figure 11, along the length direction of tooth bar, the top of described tooth bar main body 131 has the tooth engaged with gears meshing, the bottom of tooth bar main body 131 does not then have the tooth engaged with gears meshing, the i.e. single Gear shape process of tooth bar 13, the bottom of tooth bar main body 131 is straight, and the bottom surface of described tooth bar head 133 is straight.When bench pulling capacity need not so high time, this preferred scheme can be adopted.The single Gear shape process of tooth bar 13, reduces manufacturing cost.

Further, as shown in figure 12, described trombone slide backstage 6 has V-type roller-way 65, and on the section of vertical tooth rack length direction, the bottom surface of described tooth bar head is V-type.Optimize the shape of tooth bar head, according to the height of roller-way during core rod position, the roll surface according to trombone slide backstage V-type roller-way makes corresponding tooth bar head, roller-way is met and transports plug, be unlikely to again to collide with tooth bar, play the effect of simplifying auxiliary movement.

Further, as shown in Fig. 6, Fig. 7 to Fig. 8, each roller die is three-high mill, and each roller die comprises three rolls, and three rolls are respectively around the respective driven rotation of rotation axis, each roller die 30 is disposed in parallel in lathe bed, each roller die comprises three rolls, is respectively roll 31, roll 32, roll 33, three rolls respectively around the respective driven rotation of rotation axis A1, A2, A3, article three, the angle between axis is 60 °, and the roll in adjacent roller die is 60 ° of phase angle interlaced arrangement.

Frame both sides arrange side tooth plate 29, after roller die 30 loads lathe bed, fix with briquetting 27.As shown in Figure 6, circular mould bases 30, because adjacent roller die dislocation is arranged, the mode of employing turns 180 ° of placements around rolling line, makes troubles to workshop lifting.This problem can be avoided preferably when adopting six side's roller dies 24 as shown in Figure 7.Six side's roller dies 24 are equipped with positive suspension ring 25 and side suspension ring 26.If a roller die adopts positive suspension ring 25 upward, then adjacent roller die adopts side suspension ring 26 upward, thus the median plane of each roll of adjacent roller die realizes 60 ° of dislocation layouts.Above two kinds of roller die forms are equivalent to " six sides " stressed rolling hollow forging (i.e. the stressed rolling of six direction), and advantage effectively suppresses and eliminates the ears or side handles of a utensil of roll shop building roll gap generation at waste tube-surface.

And then as shown in Figure 8, when adopting all directions roller die 20, adjacent roller die adopts 45 ° to misplace and arranges, can be equivalent to " nine sides " stressed rolling hollow forging (nine direction rollings).Middle suspension ring 21, left suspension ring 22, right suspension ring 23 are equipped with roller die 20 from all directions, if suspension ring 21 upward during a roller die adopts, then, adjacent roller die adopts left suspension ring 22 upward, and rear adjacent roller die adopts right suspension ring 23 upward, thus realizes circumferentially 45 ° and the 30 ° dislocation layouts replaced.The frame gabarit of roller die 20 adopts from all directions from all directions, thus realizes 45 ° of dislocation layouts.Like this, make hollow billet rolling circumferencial direction reasonable stress, rolling evenly.Wherein, adjacent 3 roller dies Overlay after 45 ° that misplaces successively is exactly " nine sides ".

Roller die 20 is all the same with the roll that six side's roller dies 24 use from all directions, and roller die 20 and six side's roller dies 24 except having any different in the quantity (respectively 3 and 2) of mould bases exterior contour and suspension ring from all directions, do not have other to distinguish.

As shown in Figure 3 and Figure 4, the connected mode that tooth bar and plug adopt automatic locking and open, in the running of tooth bar 13, folded spring 12 (disc spring) promotes locking bar 11, by the clamping tail end of plug 9 tightly snap close be fixed on tooth bar 13.When tooth bar 13 is in the start bit of plug 9 or stop bit, tooth bar enters guide plate 14, pinch roller rocking handle 10 pressurized, promote locking bar 11 and compress folded spring 12, this hour rack 13 is opened, and plug 9 can with its disengaging and loading and unloading, single excellent material loading when namely rolling is initial, rod pipe blanking (plug band rolls rear hollow forging) when rolling stops, loading and unloading station lays respectively at the both sides on trombone slide backstage.Tooth bar 13 is in rolling running, and folded spring 12 promotes locking bar 11, and be tightly locked in by plug 9 on tooth bar 13, now pinch roller rocking handle 10 raises up, and presses down until get back to the lower of start bit guide plate 14.

As shown in Figure 5, from boring a hole, the hollow billet of coming is placed on the material feeding foreground 3 within pipe end line A4, pipe end line A5, material feeding foreground 3 is arranged at equal intervals long tube tile 16, middle pipe thread watts 17 and short tube tile 18, and these are the unique tiles of trombone slide unit, object fastens hollow billet, is beneficial to and wears rod.Hollow billet is changeable, controls the action of tile according to its length selectively.When hollow billet supplied materials is when becoming mildewed pipe, long tube tile 16, middle pipe thread watts 17, short tube tile 18 are detained simultaneously, and positioning baffle 2 puts in place, sticks hollow billet tail end, the backstop to hollow billet during for wearing rod.Wear after rod completes, necking machine 4 pairs of hollow billet head ends close up; When hollow billet supplied materials is moderate-length hollow billet, long tube tile 16 is opened, and middle pipe thread watts 17 and short tube tile 18 are detained simultaneously, and positioning baffle 2 puts in place backstop, and necking machine 4 closes up; When hollow billet supplied materials is undercoat pipe, long tube tile 16 and middle pipe thread watts 17 is opened, and short tube tile 18 is detained, and positioning baffle 2 puts in place backstop, and necking machine 4 closes up.The positioning baffle 2 of bench, for locating the different hollow billet length of backstop, controls Long travel hydraulic cylinder by overflow valve, hollow billet be pushed into reducing position swing type fixed dam and be close to hollow billet, tile on material feeding foreground 3 fastens hollow billet, and the fixed dam being then positioned at reducing place is arranged, and waits for and wears rod.Necking machine is fixed, and plug reducing position calculates location by encoder.

The utility model has significant difference on its transmission arrangments, force way and tool design, belongs to CPE new method.Motor drives tooth bar by reductor, pull plug to draw hollow forging.In same specification situation, the utility model can provide the roll-force larger than push-bench, and frame of simultaneously nipping number is more, provides larger percentage elongation.The utility model can provide the seamless steel tube production mode of the larger percentage elongation rolling of more high-efficiency and economic, roller die is close to layout, roller die number of simultaneously nipping greatly increases, lathe bed coefficient is less, diameter of mandrel is less, hollow forging diameter can be produced less, and there is no pressure bar stabilization sex chromosome mosaicism, save the replacing construction that tile instrument and product change specification in a large number.

The foregoing is only the schematic detailed description of the invention of the utility model, and be not used to limit scope of the present utility model.For each part of the present utility model can mutually combine under the condition of not conflicting; any those skilled in the art; equivalent variations done under the prerequisite not departing from design of the present utility model and principle and amendment, all should belong to the scope of the utility model protection.

Claims (9)

1. a bench, for hollow billet is rolled into hollow forging, is characterized in that, described bench comprises:

Lathe bed (5), is arranged on roll line;

Multiple roller die, is disposed in parallel in lathe bed (5);

Necking machine (4), is positioned at the entrance of described lathe bed (5);

Material feeding foreground (3), is positioned at the upstream of necking machine (4), bears hollow billet to be rolled;

Trombone slide backstage (6), is positioned at the outlet of described lathe bed, and described trombone slide backstage (6) supports plug and hollow billet;

Rack pinion system (7), is positioned at the downstream of described trombone slide backstage (6);

Plug, connect described rack pinion system (7), and described plug can at material feeding foreground (3), necking machine (4) and lathe bed (5), carry out reciprocating linear between roller die (30) and trombone slide backstage (6) and move.

2. bench as claimed in claim 1, it is characterized in that, described bench also comprises: the positioning baffle (2) being arranged on described material feeding foreground (3) upstream.

3. bench as claimed in claim 2, it is characterized in that, described bench also comprises: the rise and fall roller (1) being arranged on described positioning baffle (2) upstream, described positioning baffle (2) is connected between described rise and fall roller (1) and described material feeding foreground (3).

4. bench as claimed in claim 1, it is characterized in that, described rack pinion system (7) comprising: driving motor, the gear be connected with described driving motor, with the tooth bar of described gears meshing, wherein, described tooth bar is connected with described plug.

5. bench as claimed in claim 4, it is characterized in that, described plug comprises: the head connected successively, excellent body and afterbody, the excellent body of described plug comprises two sections, interconnective thick section and thin segment respectively, thick section is plug active section, the length of thin segment is greater than lathe bed length, thick section and thin segment shaft shoulder place are the reducing position of plug, it is tapered that the head of plug (9) is positioned at thick section termination, the afterbody of described plug (9) is the clamping head connected with tooth bar, and described clamping head is connected with described thin segment.

6. bench as claimed in claim 4, it is characterized in that, described tooth bar comprises: with the tooth bar main body of gears meshing and the tooth bar head that is connected with described tooth bar main body, described tooth bar head is connected with described plug, wherein, described tooth bar head is positioned under described tooth bar main body, along the length direction of tooth bar, the top of described tooth bar main body has tooth engaged, and the bottom surface of described tooth bar head is straight.

7. bench as claimed in claim 4, it is characterized in that, described trombone slide backstage has V-type roller-way, and on the section of vertical tooth rack length direction, the bottom surface of described tooth bar head is V-type.

8. bench as claimed in claim 1, it is characterized in that, each roller die comprises three rolls, and three rolls are respectively around the respective driven rotation of rotation axis, angle between the rotation of three rolls is 60 °, and the roll in adjacent roller die is 60 ° of phase angle interlaced arrangement.

9. bench as claimed in claim 1, it is characterized in that, each roller die comprises three rolls, and three rolls are respectively around the respective driven rotation of rotation axis, angle between the rotation of three rolls is 60 °, and adjacent roller die adopts 45 ° of phase angle dislocation to arrange.