CN103084400B - A kind of mill housing with cementation zone - Google Patents
A kind of mill housing with cementation zone Download PDFInfo
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- CN103084400B CN103084400B CN201310049757.5A CN201310049757A CN103084400B CN 103084400 B CN103084400 B CN 103084400B CN 201310049757 A CN201310049757 A CN 201310049757A CN 103084400 B CN103084400 B CN 103084400B
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- memorial archway
- working face
- cementation zone
- contact position
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Abstract
The invention discloses a kind of mill housing with cementation zone, comprise memorial archway body, memorial archway body offers window, the frame wall of window is provided with the first working face corresponding to yoke contact position under memorial archway and the second working face corresponding to slide plate contact position, first, second working face is equipped with cementation zone.Also be provided with the 3rd working face corresponding to screw box contact position, also be provided with the 4th working face corresponding to yoke contact position on memorial archway and the 5th working face corresponding to work roll bending bascule contact position, the 3rd, the 4th, the 5th working face is equipped with cementation zone.The present invention protects memorial archway working surface; Reduce the mill gap increasing because memorial archway surface damage brings, milling train steady operation, reduces to impact, reduces the possibility that Torsional Vibration of Shafts occurs.Further, increase the service life; Reduce and occur the expense that defect is repaired online; Reduce maintenance time, reduce maintenance cost; Improve operating rate and the economic benefit of milling train.
Description
Technical field
The present invention relates to a kind of metallurgical machinery, the mill housing in large-scale steel rolling equipment field, particularly relate to a kind of shock-resistant, resistance to wear and the erosion-resisting mill housing with cementation zone.
Background technology
At present, in large strip rolling mill equipment, mill housing generally adopts the manufacture of low-carbon cast steel material, due to the key component that memorial archway is milling train, its safety coefficient generally obtains larger, although the carbon equivalent of this memorial archway is smaller, the strength and stiffness of its memorial archway can both meet the use of production; And the cost of low-carbon cast steel is relatively low, manufacture than being easier to; 3rd, because memorial archway belongs to large-scale steel-casting, there is casting flaw than being easier to, adopting the material of low-carbon cast steel to be easier to defect repair ratio.Thus low-carbon cast steel is widely used in engineering practice.
Because the rolling load of large-sized rolling mills is larger, impact load is at work also larger, all larger impact can be produced when particularly nipping, dish out or occur in the operation of rolling sudden load change at rolled piece, and these loads can be applied to mill housing window surface, the surface of the upper and lower yoke of memorial archway also may be applied to.Usually, in horizontal plane, impact load passes to memorial archway slide plate by roller system of rolling mill, and then is applied to the inner surface of memorial archway window, and the shock loading in vertical plane can pass to the working surface of the upper and lower yoke of memorial archway by pressure or pressuring upper device and backing plate etc.But the impact in producing always exists uncertainty, and the direction of shock loading is not also always only in a direction, the normally synthesis of horizontal and vertical load.
Because large-sized rolling mills operationally needs pair roller system to cool, there is a large amount of cooling fluids in production environment, and the water in cooling fluid can enter between slide plate and memorial archway inner surface inside gap, and after working long hours, the surface of working part can by corrosion.
In the production environment of hot rolling, the slab of cooling fluid contact heat can be atomized or be formed inside the gap that steam enters between slide plate and memorial archway inner surface, meanwhile, air also can enter in this gap, and water, atomized water or steam and air exist in slide clearance local.When milling train is subject to intense impact, can partial high pressure be produced, and then produce memorial archway surface erosion.
For rolling mill, also memorial archway and slide clearance may be entered along with water smoke by the iron scale particulate that water under high pressure is laid, the hardness of iron scale particulate is very high, when milling train is subject to intense impact, slide plate and memorial archway surface can be pressed into, forms concave point at slide plate and memorial archway inner surface, generation stress is concentrated, and once water or steam, air proceed to concave point place, corrosion and cavitation will be aggravated further, cause memorial archway to damage further.
Under long-term working condition, once there is the damage that local is very little in the surface of memorial archway, due to the impact of above-mentioned factor, larger damage will be there is further, finally occur memorial archway mass lesions, cause memorial archway window gap to become large, there is unstability in milling train work, and this unstability will cause the aggravation of milling train impact load further, worsen the condition of work of memorial archway and slide plate conversely further, make the damage further of memorial archway surface; And along with the increasing in gap, add the possibility that torsional oscillation appears in transmission system, cause driveline torque coefficient (TAF) value to be amplified, occur that power transmission shaft or roller equipment damage; And due to the increasing in gap, the operation of rolling must be caused unstable, affect the surface quality of rolled piece.
In order to overcome above-mentioned defect, at present in production practices, after memorial archway goes wrong; have no alternative but shut down; process online, general step shuts down to take out roller, dismounting slide plate; cleaning clean surface; defect detecting test surface condition, rejected region machining, repairs afterwards; paste after the scheme of repairing has processing backing plate making up memorial archway change in size, thicken slide plate, with molten metal carry out repairing, REPAIR WELDING, laser melting coating etc., also need defect detecting test again after reparation.
But process online memorial archway defect in the prior art, the step sequence of operation is various, need shutdown, roll change, mounting or dismounting slide plate, reparation, repeatedly check, thus the operating time is long especially, delays the production time very long.When damaged area is large, once repair and cannot meet the needs of production, also need repeatedly to repair memorial archway, this has become production scene technical barrier urgently to be resolved hurrily.First, process online, need moveable machine tool to carry out machined, need flaw detection equipment, need special prosthetic appliance, as laser cladding apparatus, thus rehabilitation cost is expensive especially; Secondly, process online, also there is suitable technical risk in some method, as overlaying method, because welding heat affected zone is larger, need to take special operating procedure, as carried out preheating, noting insulation etc., but the condition at scene does not heat-treat the means eliminated stress, thus may bring out weld crack, bring equipment Risk; Further, repair online, technical sophistication, operation easier is large, and can not adopt the machining benchmark of former memorial archway, dimensional accuracy and form and position tolerance are difficult to recover completely, and machining accuracy and surface quality are difficult to ensure.And in the vertical direction, although the condition of work at pressure and backing plate place is much better, because mill milling load is very large, under the operating mode of the impact loads such as special existence loading, Condition of Sudden Unloading, load sudden change suddenly, still there is the possibility of damage in load contact face.
For existing two-roller mill memorial archway and four-high mill memorial archway, refer to Fig. 1 to Fig. 4, be respectively the structural representation of the structural representation of apparatus arrangement in existing two-roller mill memorial archway window, four-high mill memorial archway embodiment one to embodiment three.Wherein, the difference of Fig. 3 and Fig. 2 is mainly: the top of Fig. 3 has screw box; Fig. 4 and Fig. 3 distinguishes and is mainly: the memorial archway window two sides slide plate installed surface in Fig. 3 is the surface be separated up and down, and the memorial archway window two sides slide plate installed surface in Fig. 4 is the surface be integrated continuously.
Specifically, as shown in Figure 1, screwdown gear 2 is generally installed in the window 100 of two-roller mill memorial archway, top working roll assembling 3, bottom working roll assembling 4, hydraulic pressure presses cylinder or lower elevation adjusting device 5, lower bolster 6, upper roller system bascule 8, memorial archway slide plate 9, changing track for roll 10, hydraulic pressing cylinder or upper roller system roll-separating mechanism 12, work roll bending bascule 14 etc.As shown in Figures 2 to 4, in the window 100 of four-high mill memorial archway except aforementioned device, top backing up roll assembling 13, lower support roll of rolling mill assembling 15, changing track for roll 16 etc. are also installed.The structure of two-roller mill memorial archway and four-high mill memorial archway is the known technology of this area, therefore is not repeated at this.
In the milling train course of work, because rolled piece is nipped, to be dished out and in the operation of rolling, the gap of sudden load change and equipment exists equipment may be caused to be subject to impact load, impact in the vertical direction: the lower working face 104 of yoke on the upper working face 103 of yoke, memorial archway under the memorial archway working face 101 that screw box contacts with memorial archway, memorial archway; Impact in the horizontal direction: the memorial archway working face 102 that slide plate is installed, the memorial archway working face 105 of work roll bending bascule installation.These impact loads cause very adverse influence to equipment, will produce certain injury to these working faces.Especially under hot-rolled condition, the existence of a large amount of cooling fluid (as roll cooling water) and high pressure descaling water, the rolled piece of cooling fluid contact red heat produces atomization, and iron scale or iron powder particulate are by likely along with fog enters into the gap of memorial archway slide plate 9, or by high pressure water flushing in the gap of memorial archway slide plate 9, and the load of equipment can be applied on memorial archway slide plate 9, particularly under impact load, can grievous injury memorial archway slide plate 9 and memorial archway working face.
Summary of the invention
The object of this invention is to provide a kind of working surface can protecting memorial archway; Reduce the mill gap increasing because memorial archway surface damage brings, make milling train steady operation, reduce to impact, the possibility that reduction Torsional Vibration of Shafts occurs, there is the mill housing of cementation zone.
Another object of the present invention is to provide a kind of service life extending memorial archway; Reduce and occur the expense that defect is repaired online; Reduce memorial archway maintenance time, reduce the mill housing with cementation zone of maintenance cost.
Another object of the present invention is to provide a kind of service time extending memorial archway equipment, ensures the equipment availability time, improves the mill housing with cementation zone of operating rate and productivity effect.
For achieving the above object, the present invention proposes a kind of mill housing with cementation zone, comprise memorial archway body, described memorial archway body offers window, the frame wall of described window is at least provided with the first working face corresponding to yoke contact position under memorial archway and the second working face corresponding to slide plate contact position, described first working face and described second working face are equipped with cementation zone.
There is the mill housing of cementation zone as above, wherein, the frame wall of described window is also provided with the 3rd working face corresponding to screw box contact position, described 3rd working face is provided with cementation zone.
There is the mill housing of cementation zone as above, wherein, the frame wall of described window is also provided with the 5th working face corresponding to work roll bending bascule contact position, described 5th working face is provided with cementation zone.
There is the mill housing of cementation zone as above, wherein, the frame wall of described window is also provided with the 4th working face corresponding to yoke contact position on memorial archway and the 5th working face corresponding to work roll bending bascule contact position, described 4th working face and described 5th working face are equipped with cementation zone.
Have the mill housing of cementation zone as above, wherein, described second working face is vertically in sequential like.
Have the mill housing of cementation zone as above, wherein, described second working face is vertically divided into two sections, between described two section of second working face, be provided with described 5th working face.
Have the mill housing of cementation zone as above, wherein, described cementation zone is alloy-layer.
Have the mill housing of cementation zone as above, wherein, described cementation zone is formed on the frame wall of described window by built-up welding or surfacing.
Have the mill housing of cementation zone as above, wherein, the thickness of described cementation zone is 1mm ~ 5mm.
Compared with prior art, the present invention has following characteristics and advantage:
The present invention is by the acting surface at vertical direction: the upper working face (the first working face) of yoke under memorial archway, lower working face (the 4th working face of yoke on the memorial archway working face (the 3rd working face) that screw box contacts with memorial archway and memorial archway, and shock surface in the horizontal direction: the memorial archway working face (the 5th working face) etc. of the memorial archway working face (the second working face) that slide plate is installed and the installation of work roll bending bascule carries out topical surface treatment everywhere, built-up welding is passed through in the device fabrication stage, surfacing or additive method form the hardened layer of thin layer in memorial archway face, make it have corrosion-resistant, shock-resistant, the performance of antifatigue.
The present invention accomplishes to take precautions against in possible trouble from design concept; memorial archway groundwork face is just made to be protected at equipment de-sign with at the beginning of manufacturing; thus reach and extend memorial archway service life; maintain the rational gap of milling train; reduce impact load; improve rolled piece nip, dish out and in the operation of rolling sudden load change on the impact of equipment, reduce torsional oscillation occur possibility.Avoid because protect, and occur that working face destroys; Avoid therefore and have no alternative but repair aborning, affecting the production time; Avoid the reparation of memorial archway working face on-line machining, need Special movable lathe, need special prosthetic appliance (as laser cladding equipment), need special flaw detection equipment etc., spend high, step sequence is numerous and diverse, operation and inconvenience thereof, the defects such as labour intensity is large.Such scheme, for the control in equipment gap, milling train stability rolling, alleviate equipment wearing and tearing all more favourable, the service life of equipment can be improve greatly, ensure that the security of equipment, reduce the impact of equipment, decrease device damage, reduce cost of equipment maintenance, avoid on-line machining, greatly reduce unnecessary processing charges, ensure that the device fabrication time, improve operating rate and economic benefit.
Accompanying drawing explanation
Accompanying drawing described here only for task of explanation, and is not intended to limit scope disclosed by the invention by any way.In addition, the shape of each parts in figure and proportional sizes etc. are only schematic, for helping the understanding of the present invention, are not the shape and the proportional sizes that specifically limit each parts of the present invention.Those skilled in the art under the teachings of the present invention, can select various possible shape and proportional sizes to implement the present invention as the case may be.
Fig. 1 is the structural representation of apparatus arrangement in existing two-roller mill memorial archway window;
Fig. 2 is the structural representation of apparatus arrangement embodiment one in existing four-high mill memorial archway window;
Fig. 3 is the structural representation of apparatus arrangement embodiment two in existing four-high mill memorial archway window;
Fig. 4 is the structural representation of apparatus arrangement embodiment three in existing four-high mill memorial archway window;
Fig. 5 is the structural representation that the present invention has the two-roller mill memorial archway of cementation zone;
Fig. 6 is the structural representation that the present invention has the four-high mill memorial archway embodiment one of cementation zone;
Fig. 7 is the structural representation that the present invention has the four-high mill memorial archway embodiment two of cementation zone;
Fig. 8 is the structural representation that the present invention has the four-high mill memorial archway embodiment three of cementation zone.
Description of reference numerals:
1-memorial archway body; 2-screwdown gear; 3-top working roll assembles; 4-bottom working roll assembles; 5-hydraulic pressure presses cylinder or lower elevation adjusting device; The lower bolster that 6-contacts with yoke upper surface under memorial archway; 7-screw box; 8-upper roller system bascule; 9-slide plate; 10,16-changing track for roll; The upper padding plate that 11-contacts with yoke lower surface on memorial archway; 12-hydraulic pressing cylinder or upper roller system roll-separating mechanism; 13-top backing up roll assembles; 14-work roll bending bascule; 15-lower support roll assembles;
100-window; 101-first working face; 102-second working face; 103-the 3rd working face; 104-the 4th working face; 105-the 5th working face; 200-cementation zone.
Detailed description of the invention
By reference to the accompanying drawings with the description of the specific embodiment of the invention, can clearly understand details of the present invention.But the specific embodiment of the present invention described here, only for explaining object of the present invention, and can not to be understood as by any way be limitation of the present invention.Under the teachings of the present invention, technical staff can conceive based on distortion possible arbitrarily of the present invention, and these all should be regarded as belonging to scope of the present invention.
Mill housing involved in the present invention; be described for typical two-roller mill and four-high mill memorial archway; as for six rollers, eight rollers; and multi-roll mill or other milling trains; though be not described and describe; the theory of its design and method, as long as and the structure unity of thinking protected of the present invention, all in the scope of protection of the invention.
Please refer to Fig. 5 to Fig. 8, be respectively the structural representation that the present invention has the two-roller mill memorial archway of cementation zone; The structural representation of four-high mill memorial archway embodiment one of the present invention, embodiment two and embodiment three.The present invention proposes a kind of mill housing with cementation zone, comprise memorial archway body 1, memorial archway body 1 offers window 100, the frame wall of window 100 is at least provided with the first working face 101 corresponding to yoke contact position under memorial archway (lower bolster 6 namely contacted with yoke upper surface under memorial archway) and the second working face 102 corresponding to slide plate 9 contact position, the first working face 101 and the second working face 102 are equipped with cementation zone 200.Arrange cementation zone 200 for the control in equipment gap, milling train stability rolling, alleviate equipment wearing and tearing all more favourable, the service life of equipment can be improve greatly, ensure that the security of equipment, the impact of reduction equipment, decreases device damage, reduces cost of equipment maintenance, avoid on-line machining, greatly reduce unnecessary processing charges, ensure that the device fabrication time, improve operating rate.
Further, as shown in Fig. 5, Fig. 7, Fig. 8, for the mill housing being provided with screw box 7, the frame wall of window 100 is also provided with the 3rd working face 103 corresponding to screw box 7 contact position, the 3rd working face 103 is provided with cementation zone 200.
Further, as shown in Figure 6, the frame wall of window 100 is also provided with the 4th working face 104 corresponding to yoke contact position on memorial archway (upper padding plate 11 namely contacted with yoke lower surface on memorial archway); As shown in Figure 6, Figure 7, the frame wall of window 100 is also provided with the 5th working face 105 corresponding to work roll bending bascule 14 contact position, the 4th working face 104 and the 5th working face 105 are equipped with cementation zone 200.
As shown in Figure 5, Figure 8, the second working face 102 is vertically in sequential like, and correspondingly, cementation zone 200 is arranged on the second working face 102 continuously.As shown in Figure 6, Figure 7, the second working face 102 is vertically divided into two sections, is provided with the 5th working face 105 between two section of second working face 102.Correspondingly, cementation zone 200 is separately positioned on the second working face 102 of two sections.
In the present invention, cementation zone 200 is formed on the relevant position of frame wall of window 100 by built-up welding or surfacing.Or also can adopt other known solidification combinations, as long as ensure that cementation zone 200 is firmly solidificated on the frame wall of window 100.
In the present invention, cementation zone 200 adopts alloy material, such as, adopt nickel chromium triangle cobalt-alloy material; Certainly, cementation zone 200 also can adopt other known alloy material, as long as can reach the object of protection memorial archway working surface.The thickness of alloy surface hardened layer 200 is 1mm ~ 5mm, thus ensures hardness and the thickness requirement of cementation zone.
The present invention can heat-treat to disappear in manufactory and answer, and avoids carrying out hot-working to finisher memorial archway online, needs various means and measure to carry out Local treatment, occur crackle and damage memorial archway, and bringing larger equipment Risk and maintenance cost; Than the precision being easier to controlled working, can obtain reasonable dimensional accuracy and form and position tolerance in manufactory, avoid online reparation, change machining benchmark, machining accuracy is difficult to the problem ensured; In manufactory, operating procedure easily controls, than being easier to the combination ensureing memorial archway cementation zone and mother metal, the quality of hardened layer is good, avoids online reparation to limit by field condition because of control device, and occur that repair layer quality is unstable, need the problem of again repairing after using a period of time; Extend the memorial archway life-span, greatly reduce plant maintenance amount, reduce maintenance cost.
For the detailed explanation of the respective embodiments described above, its object is only to make an explanation to the present invention, so that the present invention can be understood better, but, it is limitation of the present invention that these descriptions can not become with any explanation, particularly, each feature described in various embodiments also can be combined mutually, thus form other embodiments, except there being clearly contrary description, these features should be understood to can be applied in any one embodiment, and are also not only confined to described embodiment.
Claims (5)
1. one kind has the mill housing of cementation zone, comprise memorial archway body, described memorial archway body offers window, it is characterized in that, the frame wall of described window is at least provided with the first working face corresponding to yoke contact position under memorial archway and the second working face corresponding to slide plate contact position, described first working face and described second working face are equipped with cementation zone; Described second working face is vertically in sequential like.
2. there is the mill housing of cementation zone as claimed in claim 1, it is characterized in that, the frame wall of described window is also provided with the 3rd working face corresponding to screw box contact position, described 3rd working face is provided with cementation zone.
3. have the mill housing of cementation zone as claimed in claim 1 or 2, it is characterized in that, described cementation zone is alloy-layer.
4. have the mill housing of cementation zone as claimed in claim 3, it is characterized in that, described cementation zone is formed on the frame wall of described window by built-up welding or surfacing.
5. have the mill housing of cementation zone as claimed in claim 3, it is characterized in that, the thickness of described cementation zone is 1mm ~ 5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310049757.5A CN103084400B (en) | 2013-02-07 | 2013-02-07 | A kind of mill housing with cementation zone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310049757.5A CN103084400B (en) | 2013-02-07 | 2013-02-07 | A kind of mill housing with cementation zone |
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| CN103084400A CN103084400A (en) | 2013-05-08 |
| CN103084400B true CN103084400B (en) | 2016-01-13 |
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| CN201310049757.5A Active CN103084400B (en) | 2013-02-07 | 2013-02-07 | A kind of mill housing with cementation zone |
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Families Citing this family (1)
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| CN107175459A (en) * | 2017-07-21 | 2017-09-19 | 淄博福世蓝高分子复合材料技术有限公司 | Mill housing abrasion process is repaired using positioning mode |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947682A (en) * | 2010-09-06 | 2011-01-19 | 常州宝菱重工机械有限公司 | Method for surface overlaying of frame of continuous casting machine |
| CN203044508U (en) * | 2013-02-07 | 2013-07-10 | 中冶京诚工程技术有限公司 | Rolling mill rack provided with surface hardened layers |
| CN203140439U (en) * | 2013-01-07 | 2013-08-21 | 鞍钢重型机械有限责任公司 | Anti-corrosion rolling mill frame |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60227907A (en) * | 1984-04-25 | 1985-11-13 | Hitachi Ltd | Production of rolling stand for rolling mill |
| JPH0313216A (en) * | 1989-06-12 | 1991-01-22 | Hitachi Ltd | Housing for cluster mill and its manufacture |
| JP3081298B2 (en) * | 1991-09-18 | 2000-08-28 | 株式会社神戸製鋼所 | Rolling mill housing |
| KR100777673B1 (en) * | 2007-02-15 | 2007-11-21 | 한국중기공업 주식회사 | Work roll chock, manufacturing method thereof and rolling mill |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947682A (en) * | 2010-09-06 | 2011-01-19 | 常州宝菱重工机械有限公司 | Method for surface overlaying of frame of continuous casting machine |
| CN203140439U (en) * | 2013-01-07 | 2013-08-21 | 鞍钢重型机械有限责任公司 | Anti-corrosion rolling mill frame |
| CN203044508U (en) * | 2013-02-07 | 2013-07-10 | 中冶京诚工程技术有限公司 | Rolling mill rack provided with surface hardened layers |
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