CN1640567A - Small-norm steel rod continuous rolling method and its guide and guards - Google Patents
Small-norm steel rod continuous rolling method and its guide and guards Download PDFInfo
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- CN1640567A CN1640567A CN 200410015930 CN200410015930A CN1640567A CN 1640567 A CN1640567 A CN 1640567A CN 200410015930 CN200410015930 CN 200410015930 CN 200410015930 A CN200410015930 A CN 200410015930A CN 1640567 A CN1640567 A CN 1640567A
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Abstract
The present invention relates to a light-size round steel continuous-rolling method. It adopts a box-square-oval-round-oval-round system and makes the blank undergo the process of continuous rolling treatment by means of alternative six stands of vertical mills and horizontal mills so as to obtain the finished product, and before intermediate round pass stand and round former stand an inlet guide wheel is set.
Description
Technical field
The present invention relates to small dimension round steel continuous rolling method.
Background technology
At present both at home and abroad conventional little round steel, line bar steel mill milling train are multi-set of rolling mill (the frame number is generally greater than 12), and the tandem mill that is similar to 6V-H (the frame spacing is big, big roller footpath, barrel length long) is general rolling than large-size round steel, adopts and is with single guide wheel D
0Case-side-ellipse-circular hole system, as shown in Figure 1, the 6V-H tandem mill is that full horizontally and vertically alternative is arranged, it is less that rolled piece reverses tendency, and all speed governing separately of each frame, can distribute extension by each road motor load approximately equal.But there is limitation in the round steel range of product size, according to former design code, the 6V-H equipment for continuously rolling can milling round steel the minimum diameter specification be φ 100mm, in the past because the restriction of factors such as process conditions, actual institute can be limited to φ 110mm under the diameter dimension of milling round steel, and φ 90mm specification has exceeded the former design specification lower limit of six tandem rollings, and thinking designs routinely, can't guarantee smooth rolling φ 90mm round steel, must design again all six frame passes.Conventional little round steel, when the line bar continuous rolling is rolling, the milling train spacing is generally at 2-3 rice, be designed to rolling big specification tandem rolling base and breaking down 6V-H tandem mill is former, the frame spacing is big (5.5 meters), and the single guide pulley system of the former design circle rolling employing of base of milling train, exist maximum difficult point to be to small dimension is rolling: the frame spacing is big, torsional moment that rolled piece bears is big, chucking power is little, poor stability, rolled piece is easy to generate down steel, reverses between milling train, cause the round steel surface to produce defectives such as the ears or side handles of a utensil, folding, severe patient may cause major accident towards guide and guard.
General roundlet steel mill rolls directly is 500-650mm both at home and abroad, barrel length is lacked (about 800mm), and breaking down 6V-H tandem mill barrel length 1100 to 1300mm, roller footpath 700-800mm, roll torque is big, the roll spring is big when rolling, especially by original design H4 pass porch guide wheel that do not roll, making operation adjust difficulty increases, also be unfavorable for stable rolling, the high accuracy that this and small dimension round steel require has constituted a pair of contradiction, and design is had higher requirement to pass, and the pass design must take into account rolling stable, dimensional accuracy, three aspect factor is adjusted in operation.
Summary of the invention
The objective of the invention is to design a kind of small dimension round steel continuous rolling pass system, and can make full use of existing resource, at the beginning of tandem mill be transformed into the finisher that can produce all size round steel.
For achieving the above object, small dimension round steel continuous rolling method of the present invention adopts case-side-ellipse-circle-ellipse-round system, and blank replaces six frame tandem rollings through vertical miller, horizontal mill and goes out finished product, and, before middle circle pass H4 frame, finished product circular hole H6 frame, establish the inlet guide wheel.
Wherein, the breaking elongation μ of blank tandem rolling
∑=3.5～4.5; Average percentage elongation is μ=1.2～1.3.
Tandem mill raw material third side cross dimensions is designed to: width 150～170mm, thickness 150～170mm.
The small dimension round steel continuous rolling pass system that the present invention adopts is case-side-ellipse-circle-ellipse-circular hole system.
Wherein, described elliptical aperture V5 pass height h=(0.77～0.95) d, pass width b=(1.45～1.80) d, wherein d is a finished product round steel diameter;
Circular hole H4 base circle diameter (BCD) D=(1.15～1.35) d, pass width b=(1.02～1.05) D, wherein d is a finished product round steel diameter;
Slotted eye V3 is of a size of: pass height h=(0.78～1.05) D, pass width b=(1.24～1.53) D, wherein D is the base circle diameter (BCD) of circular hole H4.
Rolled piece justifying-and spread coefficient β in ellipse-circular hole is: and circular hole H4 is 0.4～0.5, and oval groove V5 is 0.8～1.2, and circular hole H6 is 0.3～0.5.
The average draft of each frame of 6VH tandem rolling is 15%～25%.
The 6VH continuous rolling pass adopts case-side-ellipse-circle-ellipse-round pass schedule:
At first, fully take into account profile, the size of intermediate blank, decide the breakdown pass of tandem mill.From improving rolling efficiency, reducing the aspect of rolling temperature considers, adopt flat case---the square chest pass, therefore 2 passages adopt square---square groove system in front, V1 frame pass is the flat case pass of shallow slot that has the straight line sidewall of pass, and H2 frame pass is the square pass that has the straight line sidewall of pass and large diameter circular arc bottom land, and the main effect of this elongation pass is to make rolled piece extend, reduce the rolled piece section simultaneously, and create good condition for rolled piece correctly, successfully enters the finish rolling hole.In order to reach same extension efficient, the pass shape also has certain influence to required roll-force, and total trend that influences is that the restraining force of the sidewall of pass is big, and then the rolling force of Xiao Haoing is also big.The design of large diameter circular arc and 30mm transition inner arc radius has guaranteed that rolled piece can carry out the transition to the V3 elliptical aperture smoothly at the bottom of the H2 frame square hole slot, avoided roll-force excessive simultaneously, H2 frame draft is less than 20%, it is one minimum in 6 frames, thereby avoid metal owing to violent inhomogeneous deformation produces local stress effectively, enter finishing groove for rolled piece is stable good condition is provided.
The finishing groove mentality of designing is for adopting circle-ellipse-circular hole system.The accuracy of finish rolling hole decision round steel product size.The characteristics of this pass schedule are: deformation of rolled wire and cooling are evenly easily removed the iron scale on rolled piece surface, and the finished surface quality is better, and finished size is more accurate, can shut out the round steel of plurality of specifications from middle circular hole, and shared property is strong.
Oval groove V3 frame is designed to single false ellipse hole, single false ellipse hole has strengthened the stability of rolled piece in pass, occur rolled piece when having avoided the rolling small dimension round steel of two radius arc oval grooves and in pass, fall the situation that steel and being unfavorable for adjusts, make rolled piece be transformed into another kind of section smoothly from a kind of section.This single false ellipse hole shape and smooth deformation characteristics help stable rolling, remove the iron scale on the rolled piece, make rolled piece have favorable surface quality, are convenient to make the pass model, also are beneficial to the turning processing of roll.
Oval groove V5 frame is designed to single false ellipse hole, and elliptical aperture V5 spread coefficient β is 0.8～1.2, considers V5 frame outlet rolled piece area and width during design, thus contact point stability when guaranteeing that circular hole frame H6 nips.
Circular hole H6 frame is to produce the finished frame of φ 90mm round steel, and finished product hole whether reasonable in design will directly determine the accuracy of product cross dimensions, and directly have influence on the quality of product.Circular hole frame H6 last groove of the present invention adopts the expansion horn cupping that is connect with tangent line by the pass both sides, the height dimension h of round steel controls by top roll or the lower roll of adjusting the finished product hole, and the size b of horizontal direction mainly to be height dimension by oval groove V5 frame elliptical aperture change.The difference in size of diagonal then solves with ways such as moving axially of a certain roll.Because the non-uniform temperature on the rolled piece cross section, on the length direction tends to have influence on the variation of spreading, the time fully take into account the finished product hole in design and cross and be full of and produce the situation of the ears or side handles of a utensil.The habitual method for designing in round steel finished product hole is two radius arc methods, but this kind method exists the round steel diameter to be easy to the out-of-size scope and tolerance range reduces, operate that adjusting range narrows down, the finished product chi is difficult to control, degradation shortcoming under the process capability index.
Circular hole frame H6 last groove design mapping of the present invention is simple, is convenient to make the groove model; Its center subtended angle is smaller, and the out of roundness of rolled piece is improved, and it is fewer that metal exceeds the position of standard round when rolling; And, having increased the side pressure effect, the effect that the restriction rolled piece is spreaded strengthens, and more helps controlling the size of finished product width; When rolled piece was full of pass, roll gap oblique line diameter still can the out-of-size scope; Can reduce phenomenon because of pass wearing and tearing back diameter out-of-size scope on the circumference of 30 ° of correspondences of center subtended angle.
Because elliptical rolled piece rolling instability in circular hole, therefore must use rolling guide to come clamping through accurately adjusting to the elliptical rolled piece that enters circular hole, avoid elliptical rolled piece in circular hole because of incorrect rolling generation the " ears or side handles of a utensil ".
The small dimension round steel tandem rolling guide and guards that the present invention adopts comprises body, two carriages, charging guide plate, at least two guide wheels; Wherein, described two carriages are divided into described body both sides, and are fixed on the body base, and the one end is connected with body top, and the other end is connected by connecting rod; Described charging guide plate is arranged at two tray chambers, is fixed on the body base; At least two guide wheels are movably set in the outer end of two carriages respectively by connector.
Further, described guide and guards also is provided with rolling bearing, and this rolling bearing is arranged at the connector end.
Described guide and guards also is provided with spring, and this spring is arranged on the connecting rod.
Also be provided with ratchet, this ratchet is located on the body, and described carriage is by bearing pin and this ratchet threaded engagement.
Described guide wheel is two circular arc cambers.
The invention has the beneficial effects as follows:
Adopt the pass configuration of " case-side-ellipse-circle-ellipse-circular hole system ",
1. lengthening coefficient is little, and the pass shape can make rolled piece be transformed into another kind of section smoothly from a kind of section, thereby avoids metal owing to violent inhomogeneous deformation produces local stress, avoids drafts excessive simultaneously, steel billet is nipped be easier to;
2. the rolled piece that shuts out in this pass schedule does not have sharp-pointed corner angle, and the rolled piece cooling evenly;
3. pass shape and deformation characteristics help removing the iron scale on the rolled piece, make rolled piece have surface of good;
4. thereby can in elongation pass, obtain the circle cross section finished product in case of necessity and reduce roll change;
5. increase circular hole H4 frame inlet guide wheel, two circular arc cambers of guide wheel had both made elliptical rolled piece can enter guide wheel smoothly, guarantee again rolled piece and inlet guide wheel to contact closed good, increased the side pressure effect, guarantee that elliptical rolled piece rolling position in circular hole H4 is stable, make that rolling stability is strengthened greatly between oval groove V3, circular hole H4 frame, thus for rolled piece smoothly by with the afer bay pass and roll out the small dimension round steel and created good condition.
Description of drawings
Fig. 1 is the schematic diagram of prior art.
Fig. 2 is the schematic diagram of pass schedule of the present invention.
Fig. 3 is the schematic diagram of box pass V1 of the present invention.
Fig. 4 is the schematic diagram of square pass H2 of the present invention.
Fig. 5 is the schematic diagram of oval groove V3 of the present invention.
Fig. 6 is the schematic diagram of circular hole H4 of the present invention.
Fig. 7 is the schematic diagram of oval groove V5 of the present invention.
Fig. 8 is the schematic diagram of the round pass H6 of the present invention.
Fig. 9 is the schematic diagram of guide and guards of the present invention.
Figure 10 is the schematic diagram of guide and guards of the present invention.
Figure 11 is the schematic diagram of guide and guards of the present invention.
Figure 12 is the A-A cross-sectional schematic of Figure 11.
Figure 13 is the C-C cross-sectional schematic of Figure 12.
Figure 14 is the enlarged diagram of guide roller of the present invention.
The specific embodiment
Referring to Fig. 2, small dimension round steel continuous rolling method of the present invention adopts the round H6 of the case V1-side H2-oval V5-of oval V3-circle H4-system, and blank replaces six frame tandem rollings through vertical miller, horizontal mill and goes out finished product; Before circular hole H4 frame, finished product circular hole H6 frame, establish inlet guide wheel D1, D2.
Referring to Fig. 3～Fig. 8, it is depicted as the pass structure figure of the round H6 of the case of the present invention V1-side H2-oval V5-of oval V3-circle H4-system.
Referring to Fig. 3, V1 frame pass is the flat case pass of shallow slot that has the straight line sidewall of pass.
Referring to Fig. 4, H2 frame pass be have the straight line sidewall of pass and large diameter circular arc bottom land square pass, the main effect of this elongation pass is to make rolled piece extend, and reduces the rolled piece section simultaneously, and creates good condition for rolled piece correctly, successfully enters the finish rolling hole.In order to reach same extension efficient, the pass shape also has certain influence to required roll-force, and total trend that influences is that the restraining force of the sidewall of pass is big, and then the rolling force of Xiao Haoing is also big.The design of H2 frame square opening bottom land large diameter circular arc and 30mm transition inner arc radius has guaranteed that rolled piece can carry out the transition to the V3 elliptical aperture smoothly, avoided roll-force excessive simultaneously, H2 frame draft is 18.5, it is one minimum in 6 frames, thereby avoid metal owing to violent inhomogeneous deformation produces local stress effectively, enter finishing groove for rolled piece is stable good condition is provided.
Referring to Fig. 5, oval groove V3 frame is designed to single false ellipse hole.Oval arc radius R3 is 87mm, and width of rebate is 158mm, adopts arc transition between oval circular arc and the notch plane, and arc radius is 10mm.
As shown in Figure 7, oval groove V5 frame is designed to single false ellipse hole, oval arc radius R5 is 76mm, width of rebate is 130mm, adopt arc transition between oval circular arc and the notch plane, arc radius is 8mm, and elliptical aperture V5 spread coefficient β is 1.1, consider V5 frame outlet rolled piece area and width during design, elliptical aperture V5 outlet rolled piece area is 8170mm
2, draft is 23.3%, thus contact point stability when guaranteeing that circular hole H6 frame is nipped.
As shown in Figure 8, circular hole H6 frame is to produce the finished frame of φ 90mm round steel, and finished product hole whether reasonable in design will directly determine the accuracy of product cross dimensions, and directly have influence on the quality of product.The height dimension h of round steel controls by top roll or the lower roll of adjusting the finished product hole, and the size b of horizontal direction mainly to be height dimension by V5 frame elliptical aperture change.Fully taking into account the finished product hole when design φ 90mm pass crosses and is full of and produces the situation of the ears or side handles of a utensil.The habitual method for designing in round steel finished product hole is two radius arc methods, but this kind method exists the round steel diameter to be easy to the out-of-size scope and tolerance range reduces, operate that adjusting range narrows down, the finished product chi is difficult to control, degradation shortcoming under the process capability index.The present invention is when research and design φ 90mm pass, and last groove courageously adopts the expansion horn cupping that is connect with tangent line by the pass both sides, and the pass figure of H6 frame is referring to accompanying drawing 8, and this design method has following 5 advantages:
1, mapping is simple, is convenient to make the groove model.
2, its center subtended angle is smaller, and the out of roundness of rolled piece is improved, and it is fewer that metal exceeds the position of standard round when rolling.
3, increased the side pressure effect, the effect that the restriction rolled piece is spreaded strengthens, and more helps controlling the size of finished product width.
When 4, rolled piece was full of pass, roll gap oblique line diameter still can the out-of-size scope.
5, can reduce phenomenon because of pass wearing and tearing back diameter out-of-size scope on the circumference of 20 ° of correspondences of center subtended angle.
The finished product circular hole is designed to the expansion horn cupping that the pass both sides connect with tangent line, and thermal coefficient of expansion gets 1.013, and the key dimension parameter of this pass is as follows:
Pass width: B
6=93.4mm
Pass height: H
6=91.2mm
The angle of flare: α=20 °
Gap values between rollers: 10mm
Transition arc radius: R
6=5mm
Finished product circular hole center subtended angle smaller (α=20 °) improves the out of roundness of rolled piece greatly, more helps the control of dimensional accuracy.For φ 90mm round steel product diameter tolerance is controlled at ± 1.0mm, ovality is controlled at 0.75 times of being not more than diameter tolerance important assurance is provided.
φ 90mmV1～H6 pass size is as shown in table 1:
Table 1
| Frame | Pass height h (mm) | Pass width b (mm) | Drift angle R | Sectional area F | Draft % |
| Blank | ????25 | 26400.0 height: 160mm width: 165mm | |||
| Box V1 | ????115 | ????188 | ????25 | ????19977.5 | ????24.3 |
| Square H2 | ????140 | ????141.5 | ????30 | ????16283.6 | ????18.5 |
| Ellipse V3 | ????116 | ????158 | ????10 | ????13083.9 | ????19.7 |
| Round H4 | ????116 | ????119.8 | ????5 | ????10650.4 | ????18.6 |
| Ellipse V5 | ????84 | ????130 | ????8 | ????8165.8 | ????23.3 |
| Round H6 | ????91.2 | ????93.4 | ????5 | ????6524.9 | ????20.0 |
See also Figure 10～Figure 14 again, the small dimension round steel tandem rolling guide and guards that the present invention adopts comprises body 1, charging guide plate 2,2 ', two carriages 3,3 ', two guide wheel 5,5 ', ratchet 4, spring 9, rolling bearing 10; Wherein, described two carriages 3,3 ' are divided into body 1 both sides, are fixed on body 1 base 101, and the one end is fixedly connected by connector 7 and body 1, and the other end is fixedly connected by bolt 11 and body 1 top 102; Spring 9 is arranged on the connector 7; Described charging guide plate 2,2 ' is arranged between two carriages 3,3 ', is fixed on the base 101; Two guide wheels 5,5 ' are movably set in two carriages 3,3 ' outer end by connector 8,8 ' respectively, and guide wheel 5,5 ' is two circular arc cambers; It is the two ends of wheel shaft 81 ' that described rolling bearing 10 is arranged at connector 8,8 '; Described ratchet 4 is located on the body 1, and described carriage 3,3 ' passes through bearing pin 6 and these ratchet 4 threaded engagement.
In sum, the present invention arranges that to the full horizontally and vertically alternative of 6V-H φ 90mm continuous rolling pass has carried out bold design, innovation, replaces the case-side-ellipse-circular hole system of original band list guide wheel by adopting case-side-ellipse-circle-ellipse-circular hole system; Simultaneously, increased H4 frame inlet guide wheel, promptly adopt the pass schedule of the two guide wheels of band, elliptical rolled piece can enter guide wheel, pass smoothly, what guarantee rolled piece and inlet guide wheel again contacts closed, increased the side pressure effect, thereby successfully produced the φ 90mm round steel product that to exceed the former design specification lower limit of six tandem rollings in enormous quantities, product quality meets standard-required.
Claims (14)
1. small dimension round steel continuous rolling method, adopt case-side-ellipse-circle-ellipse-round pass schedule, blank replaces six frame tandem rollings through vertical miller, horizontal mill and goes out finished product, and establishes the guide and guards of tape entry guide wheel before middle circle pass (H4) frame, finished product circular hole (H6) frame.
2. small dimension round steel continuous rolling method as claimed in claim 1 is characterized in that, the breaking elongation μ of blank tandem rolling
∑=3.5～4.5; Average percentage elongation is μ=1.2～1.3.
3. small dimension round steel continuous rolling method as claimed in claim 1 is characterized in that, adopts tension-rolling between oval groove (V5) frame and round pass (H6) frame.
4. small dimension round steel continuous rolling method as claimed in claim 1 is characterized in that, described blank cross dimensions is: width 150～170mm, thickness 150～170mm.
5. small dimension round steel continuous rolling pass system is characterized in that, it is case-side-ellipse-circle-ellipse-circular hole system, and upright-usual friendship is for arranging.
6. small dimension round steel continuous rolling pass as claimed in claim 5 system is characterized in that the average draft of each frame pass is 15%～25%.
7. small dimension round steel continuous rolling pass as claimed in claim 5 system is characterized in that described oval groove (V3), oval groove (V5) are single false ellipse hole.
8. as claim 5 or 7 described small dimension round steel continuous rolling pass systems, it is characterized in that,
Described elliptical aperture (V5) pass height h=(0.77～0.95) d, pass width b=(1.45～1.80) d, wherein d is a finished product round steel diameter;
Circular hole (H4) base circle diameter (BCD) D=(1.15～1.35) d, pass width b=(1.02～1.05) D, wherein d is a finished product round steel diameter;
Slotted eye (V3) is of a size of: pass height h=(0.78～1.05) D, pass width b=(1.24～1.53) D, wherein D is the base circle diameter (BCD) of circular hole (H4).
9. small dimension round steel continuous rolling pass as claimed in claim 5 system, it is characterized in that, rolled piece justifying-and spread coefficient β in ellipse-circular hole is: and circular hole (H4) is 0.4～0.5, and oval groove (V5) is 0.8～1.2, and circular hole (H6) is 0.3～0.5.
10. small dimension round steel tandem rolling guide and guards is characterized in that, comprise,
Body comprises base;
Two carriages are divided into described body both sides, and are fixed on the body base, and the one end is connected with body top, and the other end is connected by connecting rod;
The charging guide plate is arranged at two tray chambers, is fixed on the body base;
At least two guide wheels are movably set in the outer end of two carriages respectively by connector.
11. small dimension round steel tandem rolling guide and guards as claimed in claim 10 is characterized in that also be provided with rolling bearing, this rolling bearing is arranged at the connector end.
12. small dimension round steel tandem rolling guide and guards as claimed in claim 10 is characterized in that also be provided with spring, this spring is arranged on the connecting rod.
13. small dimension round steel tandem rolling guide and guards as claimed in claim 10 is characterized in that also be provided with ratchet, this ratchet is located on the body, described carriage is by bearing pin and this ratchet threaded engagement.
14. small dimension round steel tandem rolling guide and guards as claimed in claim 10 is characterized in that, described guide wheel is two circular arc cambers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100159300A CN100408209C (en) | 2004-01-18 | 2004-01-18 | Small-norm steel rod continuous rolling method and its guide and guards |
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|---|---|---|---|
| CNB2004100159300A CN100408209C (en) | 2004-01-18 | 2004-01-18 | Small-norm steel rod continuous rolling method and its guide and guards |
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| CN1640567A true CN1640567A (en) | 2005-07-20 |
| CN100408209C CN100408209C (en) | 2008-08-06 |
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ID=34868148
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