CN105834514A - Flying shear great circular arc blade and polishing method - Google Patents
Flying shear great circular arc blade and polishing method Download PDFInfo
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- CN105834514A CN105834514A CN201510012227.2A CN201510012227A CN105834514A CN 105834514 A CN105834514 A CN 105834514A CN 201510012227 A CN201510012227 A CN 201510012227A CN 105834514 A CN105834514 A CN 105834514A
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Abstract
The invention relates to the field of a crank flying shear of a hot continuous rolling mill, and particularly relates to a flying shear and a polishing method thereof. The polishing method of the flying shear great circular arc blade includes the following steps: setting a maximum qualified gap; setting an initial gap between shear edges at two ends when an upper blade body and a lower blade body coincide; polishing the upper blade body and/or the lower blade body; and changing the circular arc radius of the shear edges till a gap demand is met. The flying shear great circular arc blade is characterized in that the circular arc radius of the shear edge of the upper blade body is not equal to that of the shear edge of the lower blade body. According to the method, the radius of the shear edges of the blade is changed, and then the upper blade body and the lower blade body are polished into circular arcs with different radius, and the gap between the shear edges can be adjusted optionally; the whole gap accuracy demand of the blade can be met; structures of other mechanical devices do not need to be changed, and the problem that heads and tails are generated due to uncontrollable gap accuracy of the flying shear can be finally solved; and steel scrap faults and various quality defects can be greatly reduced, and multiple effects of reduced cost and increased benefit can be achieved.
Description
Technical field
The present invention relates to continuous hot-rolling mill crank flying shears field, particularly relate to a kind of flying shear and grinding method thereof.
Background technology
Hot rolling mill rolling line continuous hot-rolling mill finish rolling uses seven frame tandem rollings, each piece of strip steel is before entering finishing mill, head will be cut away and can send into tandem mill again, also supplied materials afterbody must be cut away when being rolled down to tail part of band steel, cutting away incoming band steel head is in order to by irregularly shaped for roughing supplied materials head, strip steel head cold spot is sheared clean, strip steel is conducive to nip stable, prevent from causing milling train threading steel scrap because head is irregularly shaped, supplied materials is when preceding working procedure roughing rolls simultaneously, the head temperature of strip steel also ratio is relatively low, if not cutting away or cutting the cleanest, because of strip steel head cold spot when can cause threading, impact roll causes roll surface to damage, ultimately cause the generation of strip surface quality defect.Equally, if tail part of band steel is not cut away or cuts the cleanest, thin plate can be caused to throw steel in frame unstable, even sideslip steel scrap accident, even if normally throwing steel, also because the long temperature drop of afterbody rolling time is big, cause strip steel cold spot to damage roll, ultimately cause the production of follow-up strip steel and surface quality problems occurs, therefore, each piece of strip steel ensures end to end to cut and is totally to ensure that quality, produces stable premise.
The flying shear that rolling line uses at present is double-crank connecting rod crop shears, as shown in Figure 1, fixing transfer shares 1 including upper tool post, lower slide fixing transfer shares 2, upper tool post 3 and lower slide 4, wherein top cutter 7 and bottom knife 8 are respectively and fixedly installed on upper tool post 3 and lower slide 4, adjust pad 5 by upper tool post and lower slide adjusts pad 6 and adjusts the depth of parallelism and the perpendicularity of blade.Being characterized in that shear ability is big, strip steel shearing width 650mm～2050mm, shearing thickness maximum 65mm, hardness level is 06 at present.And the greatest problem occurred from this flying shear is sheared now is the most sometimes can not to completely cut through, causing band steel taping head, magnetic tape trailer to be rolled into finishing stand, this phenomenon has occurred and that for many years, can not fully and completely solve always；
Inventor, by a large amount of on-the-spot tracking and data analysis, finds that this problem is owing to causing flying shear blade clearance control is the best；The blade that such flying shear existing uses is orthodrome blade, as shown in Figure 2, the cutting edge indent of top cutter 7, the cutting edge evagination of bottom knife 8, both are provided with intermeshing circular arc, the cutting edge arc radius i.e. going up bottom knife is all initial cutting edge arc radius R=19635mm, can be completely superposed under the initial static state installed, certain gap can be produced at work because of abrasion, this gap is different according to institute's rolled band steel width in the replacement cycle, the gap that narrow wide ratio difference can produce is different, this criterion of acceptability is usually 0.1 ~ 1.2mm, upper bottom knife is overlapped by driven by motor, run the speed measured according to strip steel simultaneously, carry out dynamic shearing and complete each action；Cause strip steel to can't cut end to end and bring reason into, be that in the middle part of flying shear blade, gap exceeds standard caused；The reason that in the middle part of this blade, gap is big is caused to study discovery through inventor, because the strip steel specification producing line production has certain limit, it is between 850mm～1900mm, and the strip width of more than 60% is at below 1300mm, therefore flying shear blade abrasion in shear history is uneven, abrasion in the middle of existing situation this production status bottom knife is maximum, gap blade adjustment is gone up again bottom knife locking phase and is completed to propelling, many times both sides gap blade is transferred to zero-bit, or intermediate space can not be controlled, if intermediate space is adjusted to prescribed limit, both sides blade is certain to generation and hits cutter phenomenon, extruding strip steel when if middle part excesssive gap can cause shearing, part strip steel is actually not cut-out but squeezes off, therefore, can cause take the lead magnetic tape trailer phenomenon produce；If this strip steel squeezed off can not completely cut through end to end, and run with strip steel, frame can be brought into, steel scrap accident will be ultimately caused occur, this accident is the most then given up one block of steel, heavy then roll is done disconnected, bring into end to end and simultaneously enter roll gap with strip steel body, produce bilayer and enter steel and will result in roll roll breakage accident and occur.
Summary of the invention
The technical problem to be solved is to provide a kind of flying shear orthodrome blade and grinding method, by changing blade cutting edge radius, the blade repairing and sharpening of upper bottom knife become the different circular arc of radius, realize the random adjustment of blade clearance, to solve the magnetic tape trailer problem of taking the lead that in prior art, flying shear causes because gap precision is uncontrolled, greatly reduce steel scrap fault and the generation of various mass defect.
The present invention is achieved in that a kind of flying shear orthodrome blade grinding method, comprises the following steps:
S1: set maximum qualified clearance D；
S2: when the gap of cutting edge is 0 in the middle part of primary clearance H of two ends cutting edge, i.e. top cutter and bottom knife when setting top cutter and bottom knife coincidence, the primary clearance of two ends cutting edge is H, it is desirable to H≤D；
S3: top cutter and/or bottom knife carry out reconditioning, changes the arc radius of cutting edge, until meeting the clearance requirement in step S2.
In described step S2, when top cutter and bottom knife overlap, the gap of two ends cutting edge is set according to the experience of operator, and this gap is empirical parameter.
In described step S2, when top cutter and bottom knife overlap, the concrete value mode in gap of two ends cutting edge is, first add up and be sheared the width distribution of strip steel on this roll line and obtain the total block number N of strip steel and the block number n of the following strip steel of width threshold value, calculate primary clearance H=(n/N) * D according to width distribution.
Described width threshold value is usually arranged as 1300mm.
In described step S3, when top cutter and bottom knife are carried out reconditioning, keep one of them blade motionless, only another blade is carried out reconditioning.
A kind of flying shear orthodrome blade, the arc radius of the cutting edge of top cutter and the cutting edge of bottom knife is unequal.
Flying shear orthodrome blade of the present invention and grinding method wear and tear little according to both sides under existing working condition because shearing displacement is little, gap, middle part is caused to be always larger than the feature on both sides, by changing blade cutting edge radius, the blade repairing and sharpening of upper bottom knife become the different circular arc of radius, realize the random adjustment of blade clearance, meet blade entirety gap precision requirement, simultaneously without changing other plant equipment structures, finally thoroughly solve the magnetic tape trailer problem of taking the lead that flying shear causes because gap precision is uncontrolled, greatly reduce steel scrap fault and the generation of various mass defect, realize the multiple effects such as cost efficiency.
Accompanying drawing explanation
Fig. 1 is the double-crank connecting rod crop shears structure schematic front view that rolling line uses；
Fig. 2 is the schematic top plan view in existing flying shear blade incision tract gap；
Fig. 3 is the schematic top plan view in the flying shear blade incision tract gap of flying shear orthodrome blade of the present invention；
In figure: 1 upper tool post is fixing transfers shares, 2 lower slides fixing are transferred shares, 3 upper tool posts, 4 lower slides, 5 upper tool posts adjust pads, 6 lower slides adjust pad, 7 top cutters, 8 bottom knife.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is expanded on further.Should be understood that these embodiments are merely to illustrate the present invention rather than limit the scope of the present invention.In addition, it is to be understood that after having read the content of present invention statement, the present invention can be made various changes or modifications by those skilled in the art, and these equivalent form of values fall within the application appended claims limited range equally.
Embodiment 1
As shown in Figure 3, a kind of flying shear orthodrome blade, the arc radius of the cutting edge of top cutter and the cutting edge of bottom knife is unequal, in the present embodiment, the cutting edge indent of top cutter 7, the cutting edge evagination of bottom knife 8, the arc radius of the cutting edge of top cutter 7 is more than the arc radius of the cutting edge of bottom knife 8, after the cutting edge of top cutter 7 and bottom knife 8 overlaps, the gap of two ends cutting edge is 0.45mm.
A kind of flying shear orthodrome blade grinding method, comprises the following steps:
S1: setting maximum qualified clearance D, in the present embodiment, maximum qualified clearance D is 1.2mm；
S2: when the gap of cutting edge is 0 in the middle part of primary clearance H of two ends cutting edge, i.e. top cutter and bottom knife when setting top cutter and bottom knife coincidence, the primary clearance of two ends cutting edge is H, it is desirable to H≤D；
S3: top cutter and/or bottom knife carry out reconditioning, changes the arc radius of cutting edge, until meeting the clearance requirement in step S2.
In the present invention, in described step S2, when top cutter and bottom knife overlap, the gap of two ends cutting edge is set according to the experience of operator, and this gap is empirical parameter.
The most in the present invention, gap can also be by being calculated；As shown in Figure 3, in described step S2, when top cutter and bottom knife overlap, the concrete value mode in gap of two ends cutting edge is, first add up and be sheared the width distribution of strip steel on this roll line and obtain the total block number N of strip steel and the block number n of the following strip steel of width threshold value, calculating primary clearance H=(n/N) * D according to width distribution, the usual value of described width threshold value is near mean breadth；In the present embodiment, roll line is sheared the width of strip steel and is between 850mm～1900mm, and therefore width threshold value is set to 1300mm, and the total block data N of strip steel is 100 pieces, and wherein the block number of the following strip steel of width 1300mm is 65 pieces；H=(65/100) * 1.2=0.78mm, the original width of top cutter and bottom knife cutting edge is L=2100mm, i.e. circular arc chord length is L, and initial radium R is 19635mm；For the ease of calculating and reconditioning, when top cutter and bottom knife are carried out reconditioning, keep one of them blade motionless, only another blade is carried out reconditioning；Now include following four kinds of situations
1)
Reconditioning mode in i.e. Fig. 3, the cutting edge indent of top cutter 7, the cutting edge evagination of bottom knife 8, the cutting edge keeping top cutter 7 during reconditioning is motionless, is reduced the cutting edge arc radius of bottom knife 8 by reconditioning；When the original width of top cutter and bottom knife cutting edge be L=2100mm, primary clearance H=0.78mm, initial cutting edge arc radius R be 19635mm time, be 19105mm by calculating or utilizing mapping to return cutting edge arc radius r after the reconditioning of the bottom knife 8 after measuring available reconditioning.
When the experience that this step uses operator is set, primary clearance H is usually arranged as 0.45mm, when now initially cutting edge arc radius R is 19635mm, it is 19330mm by cutting edge arc radius r after the reconditioning of the bottom knife 8 calculated or after the utilization mapping available reconditioning of recurrence measurement.
2)
The cutting edge indent of top cutter 7, the cutting edge evagination of bottom knife 8, the cutting edge keeping bottom knife 8 during reconditioning is motionless, is increased the cutting edge arc radius of top cutter 7 by reconditioning；
3)
The cutting edge evagination of top cutter 7, the cutting edge indent of bottom knife 8, the cutting edge keeping top cutter 7 during reconditioning is motionless, is increased the cutting edge arc radius of bottom knife 8 by reconditioning；
The cutting edge evagination of top cutter 7, the cutting edge indent of bottom knife 8, the cutting edge keeping bottom knife 8 during reconditioning is motionless, is reduced the cutting edge arc radius of top cutter 7 by reconditioning.
Claims (6)
1. a flying shear orthodrome blade grinding method, is characterized in that, comprises the following steps:
S1: set maximum qualified clearance D；
S2: when the gap of cutting edge is 0 in the middle part of primary clearance H of two ends cutting edge, i.e. top cutter and bottom knife when setting top cutter and bottom knife coincidence, the primary clearance of two ends cutting edge is H, it is desirable to H≤D；
S3: top cutter and/or bottom knife carry out reconditioning, changes the arc radius of cutting edge, until meeting the clearance requirement in step S2.
2. flying shear orthodrome blade grinding method as claimed in claim 1, is characterized in that: in described step S2, and when top cutter and bottom knife overlap, the gap of two ends cutting edge is set according to the experience of operator, and this gap is empirical parameter.
3. flying shear orthodrome blade grinding method as claimed in claim 1, it is characterized in that: in described step S2, when top cutter and bottom knife overlap, the concrete value mode in gap of two ends cutting edge is, first add up and be sheared the width distribution of strip steel on this roll line and obtain the total block number N of strip steel and the block number n of the following strip steel of width threshold value, calculate primary clearance H=(n/N) * D according to width distribution.
4. flying shear orthodrome blade grinding method as claimed in claim 3, is characterized in that: described width threshold value is usually arranged as 1300mm.
5. flying shear orthodrome blade grinding method as claimed in claim 1, is characterized in that: in described step S3, when top cutter and bottom knife are carried out reconditioning, keeps one of them blade motionless, only another blade is carried out reconditioning.
6. a flying shear orthodrome blade, is characterized in that: the arc radius of the cutting edge of top cutter and the cutting edge of bottom knife is unequal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510012227.2A CN105834514A (en) | 2015-01-12 | 2015-01-12 | Flying shear great circular arc blade and polishing method |
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| CN201510012227.2A CN105834514A (en) | 2015-01-12 | 2015-01-12 | Flying shear great circular arc blade and polishing method |
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| CN105834514A true CN105834514A (en) | 2016-08-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107030534A (en) * | 2017-06-22 | 2017-08-11 | 攀钢集团西昌钢钒有限公司 | A kind of scrap cutter blade repairing and sharpening method |
| CN107553225A (en) * | 2017-10-13 | 2018-01-09 | 苏州利森空调制冷有限公司 | Single screw compressor main rotor cutter grinding method |
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| EP0782890B1 (en) * | 1995-07-13 | 2002-11-27 | Kawasaki Steel Corporation | Method of continuous hot rolling of billet |
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| CN201592288U (en) * | 2009-12-15 | 2010-09-29 | 宝钢集团新疆八一钢铁有限公司 | Crop shears for ribbon steel |
| CN202571455U (en) * | 2012-03-22 | 2012-12-05 | 无锡盛泽环保科技有限公司 | Novel cutter |
| CN103433551A (en) * | 2013-09-04 | 2013-12-11 | 马鞍山市恒利达机械刀片有限公司 | Swinging type concave-convex shear blade and manufacturing method thereof |
| CN203371114U (en) * | 2013-07-24 | 2014-01-01 | 中冶赛迪工程技术股份有限公司 | Shear blade for shearing wide steel plates and narrow steel plates |
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2015
- 2015-01-12 CN CN201510012227.2A patent/CN105834514A/en active Pending
Patent Citations (6)
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| EP0782890B1 (en) * | 1995-07-13 | 2002-11-27 | Kawasaki Steel Corporation | Method of continuous hot rolling of billet |
| CN201267900Y (en) * | 2008-10-07 | 2009-07-08 | 南京钢铁股份有限公司 | Shear blade with inclined cutting edge |
| CN201592288U (en) * | 2009-12-15 | 2010-09-29 | 宝钢集团新疆八一钢铁有限公司 | Crop shears for ribbon steel |
| CN202571455U (en) * | 2012-03-22 | 2012-12-05 | 无锡盛泽环保科技有限公司 | Novel cutter |
| CN203371114U (en) * | 2013-07-24 | 2014-01-01 | 中冶赛迪工程技术股份有限公司 | Shear blade for shearing wide steel plates and narrow steel plates |
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Non-Patent Citations (1)
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| 吴瑞安等: "曲柄飞剪刀片圆弧尺寸修正的分析", 《江苏冶金》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107030534A (en) * | 2017-06-22 | 2017-08-11 | 攀钢集团西昌钢钒有限公司 | A kind of scrap cutter blade repairing and sharpening method |
| CN107030534B (en) * | 2017-06-22 | 2019-02-01 | 攀钢集团西昌钢钒有限公司 | A kind of scrap cutter blade repairing and sharpening method |
| CN107553225A (en) * | 2017-10-13 | 2018-01-09 | 苏州利森空调制冷有限公司 | Single screw compressor main rotor cutter grinding method |
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Application publication date: 20160810 |