CN203470467U - Roller assembly of four-roll reversible type rolling mill - Google Patents
Roller assembly of four-roll reversible type rolling mill Download PDFInfo
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- CN203470467U CN203470467U CN201320498177.XU CN201320498177U CN203470467U CN 203470467 U CN203470467 U CN 203470467U CN 201320498177 U CN201320498177 U CN 201320498177U CN 203470467 U CN203470467 U CN 203470467U
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Abstract
The utility model discloses a roller assembly of a four-roll reversible type rolling mill. The roller assembly of the four-roll reversible type rolling mill comprises two working rollers and two supporting rollers, wherein the working rollers are both high-chromium iron rollers, the supporting rollers are both forged steel rollers, the surface smoothness of each working roller is 0.7 micron to 0.8 micron, the degree of convexity of each working roller is -0.08 millimeter to -0.12 millimeter, the roundness of each working roller is smaller than or equal to 10 microns, the conicity of each working roller is smaller than or equal to 10 microns, and the degree of convexity of each supporting roller is 0.2 millimeter to 0.3 millimeter. According to the roller assembly of the four-roll reversible type rolling mill, due to the fact that the working rollers are both high-chromium iron rollers and the supporting rollers are both forged steel rollers, by the reasonable setting of operation parameters such as the surface smoothness, the degree of convexity, the roundness and the conicity of the high-chromium iron rollers and the positive convexity of the forged steel supporting rollers, stability of the rolling process is guaranteed, the grinding amount and process loss amount of the rollers are reduced to the maximum degree, the intra-plate difference and inter-plate difference of plate products of moderate thicknesses are reduced, and the yield of the plate products of moderate thicknesses is increased.
Description
Technical field
The utility model relates to a kind of cut deal roll, relates in particular to a kind of roll of four-high reversing mill.
Background technology
The four-high reversing mill that at present most domestic Heavy Plate Plant is used, working roll be take infinitely chilled cast iron roll and high-chromium iron-cast roller as main, and backing roll be take forged steel roller as main.Indefinite chill roll is compared with high-chromium iron-cast roller, characteristic due to its material, after there is folder steel accident, fire check diffusion is little, and lower machine stock removal is little, but its hardness is low, operation of rolling wear extent is large, poor heat stability, steel transportation amount is little, and roll use amount increases virtually, roll change number of times rises, and causes operating rate to decline.
Utility model content
The purpose of this utility model is to provide the roll that can effectively improve a kind of four-high reversing mill of sheet material lumber recovery.
For achieving the above object, the technical scheme that the utility model is taked is:
A kind of roll of four-high reversing mill, comprise two working rolls and two backing rolls, described working roll all adopts high-chromium iron-cast roller, described backing roll all adopts forged steel roll, the surface smoothness of described working roll is 0.7～0.8 μ m, convexity is-0.08～-0.12mm, circularity≤10 μ m, tapering≤10 μ m; The convexity of described backing roll is+0.2～+ 0.3mm.
The roll of the four-high reversing mill that employing the utility model provides, because working roll all adopts high-chromium iron-cast roller, backing roll adopts forged steel roll, every operation parameters such as the surface smoothness by rational setting high-chromium iron-cast roller, convexity, circularity, tapering, positive convexity in conjunction with forged steel backup roll coordinates again, guarantees the stable of the operation of rolling.Simultaneously according to the expansion curve of the thermal coefficient of expansion of backing roll and working roll and the operation of rolling, set rational positive and negative convex value, farthest reduce stock removal and the process loss amount of roll, the poor and different plate of same plate that reduces cut deal product is poor, improves cut deal product lumber recovery.
Accompanying drawing explanation
Fig. 1 is that rolling initial stage working roll coordinates figure with rolled piece.
Fig. 2 is that rolling working roll in mid-term coordinates figure with rolled piece.
Fig. 3 is that rolling working roll in latter stage coordinates figure with rolled piece.
In figure, 1-working roll, 2-rolled piece.
The specific embodiment
Below in conjunction with specific embodiment and accompanying drawing thereof, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
As depicted in figs. 1 and 2, the roll of a kind of four-high reversing mill that the utility model provides, working roll all adopts high-chromium iron-cast roller, backing roll adopts forged steel roll, the surface smoothness of high-chromium iron-cast roller is 0.7～0.8 μ m, convexity is-0.08～-0.12mm, circularity≤10 μ m, tapering≤10 μ m.The convexity of forged steel backup roll is+0.2～+ 0.3mm.
General enterprises is produced the four-high reversing mill that medium plate is used, and working roll adopts infinitely chilled cast iron roll and high-chromium iron-cast roller collocation to use, and backing roll adopts forged steel roll.Because indefinite chill roll is large in machine wearing and tearing, by reality, use tracking, it once exceeds 0.6mm at machine wear extent higher chromium cast iron, and roller labour amount of rolling higher chromium grain roll declines 3000 tons, no matter is that production cost or profit margin all decline greatly.
The working roll of the four-high reversing mill of the plate production line of wine steel all adopts high-chromium iron-cast roller, by every operation parameter of rational setting high-chromium iron-cast roller, formulate optimum roller curve, guaranteeing on the basis of stable rolling, can farthest reduce roll wear, the same plate that further reduces steel plate is poor, improves lumber recovery.By the parameters such as high-chromium iron-cast roller surface smoothness, convexity, circularity, tapering are rationally adjusted and optimized, actual use procedure has obtained good effect.
When infinitely chilled cast iron roll and high-chromium iron-cast roller collocation, surface smoothness 0.5～0.6 μ m, convexity-0.03～-0.08 mm, circularity≤12 μ m, tapering≤12 μ m.
When whole employing high-chromium iron-cast roller, surface smoothness 0.7～0.8 μ m, convexity-0.08～-0.12 mm, circularity≤10 μ m, tapering≤10 μ m.
1, formulate rational high-chromium iron-cast roller fineness
Actual production process checking, the fineness of working roll roll is too small, can affect nipping smoothly of rolled piece on the one hand, rolled piece can produce " skidding " phenomenon in the operation of rolling on the other hand, especially in the larger rolling pass of drafts, rolled piece " skids " and can cause rolling rear steel plate generation larger " plagiocephaly ", increases the damage amount of cutting, thereby affect lumber recovery, even can cause larger production accident.
Meanwhile, the fineness of working roll roll is excessive, impact is rolled to the surface quality of rear steel plate, even working roll roll self surface there will be certain iron scale adhesion, roll rear surface of steel plate and produce successional defect, roll surface is exerted an influence simultaneously, cause backing roll life cycle to decline.
By control and the tracking of actual mechanical process, the fineness of working roll high-chromium iron-cast roller is set as to 0.7～0.8 μ m.
2, formulate rational high-chromium iron-cast roller tapering and circularity
The tapering of working roll and circularity and convexity are complementary, and reasonably tapering and circularity coordinate best convexity ratio, both can increase the stability of the operation of rolling, also can play very large effect to controls such as the template of steel plate, cambers simultaneously.If it is unreasonable that roll tapering or circularity in grinding process are set, in the operation of rolling, the power of depressing that roll both sides are suffered is inconsistent, finally causes thickness of two sides deviation to strengthen, and camber is controlled unstable, increases shear amount, causes lumber recovery loss.Circularity≤10 μ the m of high-chromium iron-cast roller tapering, axiality≤10 μ m.
3, formulate rational high-chromium iron-cast roller convexity
According to the coefficient of expansion of rich chromium cast iron working roll, forged steel backup roll, rich chromium cast iron working roll reaches 2000～2500 ton hours at amount of rolling, reaches thermal equilibrium state, and forged steel backup roll reaches 9000～12000 ton hours at amount of rolling, reaches thermal equilibrium state.
Forged steel backup roll is after reaching thermal equilibrium state, and its convexity does not change substantially, so be set as+0.2～+ 0.3mm of the convexity of forged steel backup roll, and the convexity of rich chromium cast iron working roll is set as-0.8～-0.12mm.
As shown in Figure 1, when the working roll high-chromium iron-cast roller of four-high reversing mill is at upper machine initial stage rolling sequence, because the thermal expansion of high-chromium iron-cast roller is greater than thermal wear, now rolled plate transverse gage is distributed as intermediate thin, two rear flank, can be by reducing roll-force, reduce the sag of roll both sides, to reach the consistent of the horizontal interior thickness of steel plate, the poor minimum of same plate of rolled piece 2 is controlled in 0.15mm.
As shown in Figure 2, when the contrary amount of rolling of four-high reversing mill reaches 2000～2500 ton hours, the thermal expansion of high-chromium iron-cast roller reaches poised state, thermal expansion simultaneously and thermal wear are basically identical, it is now best roller labour state, can larger wide, the thin specification steel plate of rolling degree-of-difficulty factor, poor can being controlled in 0.1mm of same plate of rolled piece 2, even horizontal three dot thickness reach consistent.
As shown in Figure 3, when the roller of four-high reversing mill, using as a servant amount of rolling reaches after 4000 tons, the thermal expansion of high-chromium iron-cast roller finishes, now along with the increase of amount of rolling, the thermal wear of high-chromium iron-cast roller is greater than thermal expansion, and now rolled plate transverse gage is that both sides are thin, thick middle, can be by increasing roll-force, strengthen the sag of high-chromium iron-cast roller both sides, poor can being controlled in 0.25mm of same plate of rolled piece 2.
For the raising of cut deal lumber recovery, by facts have proved, cutting under the prerequisite that damage amount is certain, rationally control steel plate laterally with longitudinally poor with plate be the most effective approach.
By the negative convexity of-0.08 of reasonable setting high-chromium iron-cast roller～-0.12mm and forged steel backup roll+the positive convexity of 0.2～+ 0.3mm, the same plate that can farthest reduce steel plate is poor, raising lumber recovery.As steel plate on average with the poor reduction of plate 0.1mm, by adjusting lumber recovery, at least promote 0.5 percentage point, corresponding consumption of raw materials index decline 5Kg/ ton; Meanwhile, by the reasonable setting of positive and negative convexity, can make roll the contacting with rolled piece of maximum area in the operation of rolling, improve the stability of operation of rolling template and allowance control.
4, accident control
Although a lot of performances of high-chromium iron-cast roller are better than indefinite chill roll, but its anti-accident ability is relative and indefinite chill roll declines to some extent, mainly because the fire check diffusion of high-chromium iron-cast roller is serious, slight folder steel accident can significantly increase stock removal, as pressed from both sides steel under the condition of high temperature more than 15S, more than stock removal can reach 5mm, the use of breaker roll produces larger impact.Therefore, stop to press from both sides steel accident, improving personnel's operative skill and accident control ability is the prerequisite that high-chromium iron-cast roller is used.
Roll is the infrastructure device of Heavy Plate Production, and the characteristic that makes full use of roll is the primary condition of Medium and Heavy Plate Rolling.The plate production line of wine steel wine steel, it is the unique production line that all uses high-chromium iron-cast roller of the current domestic same industry, in wine steel, the year roll consumption of plate remains on the advanced level (working roll consumption is 0.24Kg/t, and backing roll is at 0.6Kg/t) of 0.3Kg/t always; Simultaneously plate lumber recovery index keeps leading position of the same trade always in wine steel in recent years, and the reasonable use of roll provides good prerequisite.
Above-described is only preferred embodiment of the present utility model, does not limit to the utility model.Should be understood that for the person of ordinary skill of the art, under technology enlightenment provided by the utility model, can also make other equivalent modifications and improvement, all can realize the purpose of this utility model, all should be considered as protection domain of the present utility model.
Claims (1)
1. the roll of a four-high reversing mill, comprise two working rolls (1) and two backing rolls, it is characterized in that, described working roll (1) all adopts high-chromium iron-cast roller, described backing roll all adopts forged steel roll, and the surface smoothness of described working roll (1) is 0.7～0.8 μ m, and convexity is-0.08～-0.12mm, circularity≤10 μ m, tapering≤10 μ m; The convexity of described backing roll (2) is+0.2～+ 0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320498177.XU CN203470467U (en) | 2013-08-15 | 2013-08-15 | Roller assembly of four-roll reversible type rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320498177.XU CN203470467U (en) | 2013-08-15 | 2013-08-15 | Roller assembly of four-roll reversible type rolling mill |
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| Publication Number | Publication Date |
|---|---|
| CN203470467U true CN203470467U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320498177.XU Expired - Fee Related CN203470467U (en) | 2013-08-15 | 2013-08-15 | Roller assembly of four-roll reversible type rolling mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111940507A (en) * | 2020-07-02 | 2020-11-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for rolling thin and wide titanium plate in one fire |
-
2013
- 2013-08-15 CN CN201320498177.XU patent/CN203470467U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111940507A (en) * | 2020-07-02 | 2020-11-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for rolling thin and wide titanium plate in one fire |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20140815 |
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| EXPY | Termination of patent right or utility model |