CN108856291A - A kind of milling method of intensity 750MPa grades of very thin diamond plates - Google Patents
A kind of milling method of intensity 750MPa grades of very thin diamond plates Download PDFInfo
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- CN108856291A CN108856291A CN201810474070.9A CN201810474070A CN108856291A CN 108856291 A CN108856291 A CN 108856291A CN 201810474070 A CN201810474070 A CN 201810474070A CN 108856291 A CN108856291 A CN 108856291A
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- intensity
- thin diamond
- milling method
- 750mpa
- rack
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 38
- 239000010432 diamond Substances 0.000 title claims abstract description 38
- 238000003801 milling Methods 0.000 title claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 244000046095 Psophocarpus tetragonolobus Species 0.000 claims abstract description 12
- 235000010580 Psophocarpus tetragonolobus Nutrition 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000002791 soaking Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 244000046052 Phaseolus vulgaris Species 0.000 description 6
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of milling method of intensity 750MPa grades of very thin diamond plates, the milling method includes heating, roughing, finishing rolling step；The finishing rolling step, exit temperature at finishing are 850~870 DEG C, and finish rolling threading speed is 10.0~11.2m/s.The milling method process stabilizing of 750MPa grades of very thin diamond plate of the present invention, finished plate thickness is 1.2~1.6mm, 750~795MPa of tensile strength, 615~680MPa of yield strength, elongation 15~23%, coil of strip surface hyacinth bean 0.2~0.4mm of height, meets customer requirement, the blank of domestic 750MPa grades of Ultra-thin diamond plate production field has been filled up in the favor for firmly getting client.
Description
Technical field
The invention belongs to hot rolling technique fields, and in particular to a kind of milling method of intensity 750MPa grades of very thin diamond plates.
Background technique
High-strength automobile diamond plate is mainly used for big-load trailer box baseplate, it is desirable that has very high intensity, generally exists
650MPa or more.This high intensity diamond plate is typically all to reduce steel usage amount for automotive light weight technology, and not only intensity is high,
And thinner thickness, corresponding coils of hot-rolled steel resistance of deformation in rolling is also very big, so the control high to steel strip surface beans
Just become more difficult.How in the case where guaranteeing stable rolling simultaneously guarantee that final beans height is met the requirements, be each steel mill
The more stubborn problem faced.
Since specification is relatively thin, temperature drop is larger in the operation of rolling, and temperature decline leads to decorative pattern forming difficulty, and rolling load becomes
Greatly, patterned roll is also easier to peel off, and rolls so as to cause coil of strip useless.Roll decorative pattern peels off in order to prevent, it is necessary to rolling load is reduced,
Means, which mainly have, to be improved finishing temperature as far as possible, reduces deformation velocity, reduces process work-hardening capacity to reduce resistance of deformation.
Reducing deformation velocity can only be realized by reducing mill speed, and is reduced mill speed and be will cause the decline of rolling temperature,
So must accomplish entry temperature at finishing, finishing temperature, the balance of mill speed.It is special additionally by appropriate increasing leading portion rack
It is F1 mill load, reduces the load of back segment rack to reduce work-hardening capacity when diamond plate rolling, this is also beneficial to most
The control of whole rolled steel plate shape.
Hyacinth bean on diamond plate mainly rolls deformation by the patterned roll of last rack come so the beans of diamond plate hyacinth bean
Height depends on deformation extent of the steel band in last rack, i.e. reduction ratio.In general production process, mainly rule of thumb come
Final Stand Rolling power size is set, to guarantee that final beans height is met the requirements.But since each patterned roll roller diameter is not of uniform size, identical
Under the process conditions such as under reduction ratio and mutually synthermal, different patterned rolls are due to roller diameter difference, and generated roll-force size is not yet
Equally, so the diamond plate roll-force that often will appear different batches is essentially the same, and the beans height on coil of strip surface difference is many.
Therefore it is badly in need of developing a kind of intensity 750MPa grades of very thin decorative patterns by reasonable temperature, rolling parameter control and the adjustment of equipment
The milling method of plate guarantees that technique rolling is stablized, and beans height meets customer requirement.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of milling method of intensity 750MPa grades of very thin diamond plates, techniques
Stablize, finished plate thickness is 1.2~1.6mm, and tensile strength meets client in 750MPa or more, finished steel coils surface hyacinth bean height
It is required that.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：A kind of intensity 750MPa grades of very thin diamond plates
Milling method, the milling method include heating, roughing, finishing rolling step；The finishing rolling step, exit temperature at finishing 850
~870 DEG C, finish rolling threading speed is 10.0~11.2m/s.
Finish rolling outlet target temperature of the present invention is 850~870 DEG C, and target temperature is too low so that roll-force is obviously increased, mistake
Gao Zehui rises mill speed obviously, while strip deformation speed also will increase, not only bad for the reduction of rolling load, also
It is too fast to will lead to mill speed, can not manually adjust.
Finishing rolling step of the present invention is rolled using 7 racks, and each rack AGC pressure speed is adjusted in the electrical program of level-one
Degree, movement speed≤7 × 10 AGC of preceding 4 racks-4Movement speed≤4 × 10 m/s, rear 3 rack AGC-4m/s。
Finishing rolling step of the present invention, adjusts each rack AGC pressure amplitude in the electrical program of level-one, the 1st rack
AGC depresses amplitude≤1.5mm, upper lift amplitude≤2.0mm；AGC pressure amplitude≤0.3mm of last rack, upper lift amplitude≤
0.4mm。
Finishing rolling step of the present invention compensates the dynamic velocity drop of each rack of finish rolling, guarantees that rack dynamic velocity drop draws
The speed decline risen restores normal value in 200s.
Finishing rolling step of the present invention increases leading portion rack reduction ratio, guarantees overall reduction ratio >=85% of preceding 3 racks,
To reduce back segment rack because of the excessive bring processing hardening of reduction ratio, to reduce Final Stand Rolling load.
Heating process of the present invention, slab goes out furnace temp >=1260 DEG C, when the second bringing-up section and soaking zone heat
The sum of between >=80min, slab leads to the plate temperature difference≤20 DEG C.
Roughing operation of the present invention, roughing use 5 passes, extreme trace time and roughing outlet temperature >=1100 DEG C, slightly
Workpiece thickness after rolling is in 32~34mm.
The method of the invention production the very thin diamond plate of 750MPa grade with a thickness of 1.2~1.6mm.
750~795MPa of tensile strength of the very thin diamond plate of 750MPa grade of the method for the invention production, yield strength
615~680MPa, elongation 15~23%.
0.2~0.4mm of hyacinth bean height of the very thin diamond plate of 750MPa grade of the method for the invention production.
Intensity 750MPa grades of very thin diamond plate properties of product detection methods of the present invention refer to YB/T 4159.
Generated beneficial effect is by adopting the above technical scheme：1, the rolling of 750MPa grades of very thin diamond plate of the present invention
Method and process is stablized, and finished plate thickness is 1.2~1.6mm, and the height of coil of strip surface hyacinth bean meets customer requirement, filled up the country
The blank of 750MPa grades of Ultra-thin diamond plate production fields.2, the tension of 750MPa grades of very thin diamond plate produced by the invention is strong
Spend 750~795MPa, 615~680MPa of yield strength, elongation 15~23%.3,750MPa grades of very thin flower produced by the invention
0.2~0.4mm of hyacinth bean height of card.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The coil of strip specification of 750MPa grades of very thin diamond plates of the present embodiment intensity be 1.2 × 1250mm, milling method include heating,
Roughing, finishing rolling step, specific process step are as described below：
（1）Heating process：It is 1271 DEG C that slab, which goes out furnace temp, and the sum of the second bringing-up section and soaking zone heating time are
90min, it is 12 DEG C that slab, which leads to the plate temperature difference,；
（2）Roughing operation：Roughing uses 5 passes, extreme trace time and 1108 DEG C of roughing outlet temperature, the centre after roughing rolling
Base thickness 32mm；
（3）Finishing rolling step：It is rolled using 7 racks, each rack AGC pressing speed, preceding 4 racks is adjusted in the electrical program of level-one
AGC movement speed be respectively 7 × 10-4m/s、7×10-4m/s、6×10-4m/s、5×10-4M/s, rear 3 rack AGC movement
Speed is respectively 4 × 10-4m/s、3×10-4m/s、3×10-4m/s；
Each rack AGC pressure amplitude is adjusted in the electrical program of level-one, the AGC of the 1st rack depresses amplitude 1.4mm, upper lift width
Spend 1.8mm；The AGC of last rack depresses amplitude 0.25mm, upper lift amplitude 0.3mm；
The dynamic velocity drop of each rack of finish rolling is compensated, speed caused by rack dynamic velocity drop declines 120s and restores normal value；
Leading portion rack reduction ratio is increased, the overall reduction ratio of preceding 3 racks is 88%；
Exit temperature at finishing is 865 DEG C, and finish rolling threading speed is 11.2m/s.
The rolling of the present embodiment coil of strip is stablized, and is 0.226mm through detection coil of strip hyacinth bean height after coil of strip is offline；Very thin decorative pattern
The mechanical property of plate is：Tensile strength 795MPa, yield strength 670MPa, elongation 15%.
Embodiment 2
The coil of strip specification of 750MPa grades of very thin diamond plates of the present embodiment intensity be 1.6 × 1250mm, milling method include heating,
Roughing, finishing rolling step, specific process step are as described below：
（1）Heating process：It is 1262 DEG C that slab, which goes out furnace temp, and the sum of the second bringing-up section and soaking zone heating time are
82min, it is 17 DEG C that slab, which leads to the plate temperature difference,；
（2）Roughing operation：Roughing uses 5 passes, extreme trace time and 1191 DEG C of roughing outlet temperature, the centre after roughing rolling
Base thickness 34mm；
（3）Finishing rolling step：It is rolled using 7 racks, each rack AGC pressing speed, preceding 4 racks is adjusted in the electrical program of level-one
AGC movement speed be respectively 7 × 10-4m/s、7×10-4m/s、7×10-4m/s、6×10-4M/s, rear 3 rack AGC movement
Speed is respectively 4 × 10-4m/s、4×10-4m/s、4×10-4m/s；
Each rack AGC pressure amplitude is adjusted in the electrical program of level-one, the AGC of the 1st rack depresses amplitude 1.5mm, upper lift width
Spend 2.0mm；The AGC of last rack depresses amplitude 0.3mm, upper lift amplitude 0.4mm；
The dynamic velocity drop of each rack of finish rolling is compensated, speed caused by rack dynamic velocity drop declines 170s and restores normal value；
Leading portion rack reduction ratio is increased, the overall reduction ratio of preceding 3 racks is 85%；
Exit temperature at finishing is 870 DEG C, and finish rolling threading speed is 10.0m/s.
The rolling of the present embodiment coil of strip is stablized, and is 0.400mm through detection coil of strip hyacinth bean height after coil of strip is offline；Very thin decorative pattern
The mechanical property of plate：Tensile strength 750MPa, yield strength 625MPa, elongation 21%.
Embodiment 3
The coil of strip specification of 750MPa grades of very thin diamond plates of the present embodiment intensity be 1.3 × 1250mm, milling method include heating,
Roughing, finishing rolling step, specific process step are as described below：
（1）Heating process：It is 1268 DEG C that slab, which goes out furnace temp, and the sum of the second bringing-up section and soaking zone heating time are
87min, it is 20 DEG C that slab, which leads to the plate temperature difference,；
（2）Roughing operation：Roughing uses 5 passes, extreme trace time and 1112 DEG C of roughing outlet temperature, the centre after roughing rolling
Base thickness 32mm；
（3）Finishing rolling step：It is rolled using 7 racks, each rack AGC pressing speed, preceding 4 racks is adjusted in the electrical program of level-one
AGC movement speed be respectively 7 × 10-4m/s、7×10-4m/s、6×10-4m/s、5×10-4M/s, rear 3 rack AGC movement
Speed is respectively 4 × 10-4m/s、4×10-4m/s、3×10-4m/s；
Each rack AGC pressure amplitude is adjusted in the electrical program of level-one, the AGC of the 1st rack depresses amplitude 1.4mm, upper lift width
Spend 1.8mm；The AGC of last rack depresses amplitude 0.25mm, upper lift amplitude 0.35mm；
The dynamic velocity drop of each rack of finish rolling is compensated, speed caused by rack dynamic velocity drop declines 120s and restores normal value；
Leading portion rack reduction ratio is increased, the overall reduction ratio of preceding 3 racks is 87%；
Exit temperature at finishing is 861 DEG C, and finish rolling threading speed is 10.9m/s.
The rolling of the present embodiment coil of strip is stablized, and is 0.267mm through detection coil of strip hyacinth bean height after coil of strip is offline；Very thin decorative pattern
The mechanical property of plate：Tensile strength 775MPa, yield strength 675MPa, elongation 18%.
Embodiment 4
The coil of strip specification of 750MPa grades of very thin diamond plates of the present embodiment intensity be 1.5 × 1250mm, milling method include heating,
Roughing, finishing rolling step, specific process step are as described below：
（1）Heating process：It is 1260 DEG C that slab, which goes out furnace temp, and the sum of the second bringing-up section and soaking zone heating time are
80min, it is 18 DEG C that slab, which leads to the plate temperature difference,；
（2）Roughing operation：Roughing uses 5 passes, extreme trace time and 1100 DEG C of roughing outlet temperature, the centre after roughing rolling
Base thickness 34mm；
（3）Finishing rolling step：It is rolled using 7 racks, each rack AGC pressing speed, preceding 4 racks is adjusted in the electrical program of level-one
AGC movement speed be respectively 7 × 10-4m/s、7×10-4m/s、6×10-4m/s、6×10-4M/s, rear 3 rack AGC movement
Speed is respectively 4 × 10-4m/s、4×10-4m/s、3×10-4m/s；
Each rack AGC pressure amplitude is adjusted in the electrical program of level-one, the AGC of the 1st rack depresses amplitude 1.5mm, upper lift width
Spend 1.9mm；The AGC of last rack depresses amplitude 0.3mm, upper lift amplitude 0.4mm；
The dynamic velocity drop of each rack of finish rolling is compensated, speed caused by rack dynamic velocity drop declines 200s and restores normal value；
Leading portion rack reduction ratio is increased, the overall reduction ratio of preceding 3 racks is 88%；
Exit temperature at finishing is 850 DEG C, and finish rolling threading speed is 10.4m/s.
The rolling of the present embodiment coil of strip is stablized, and is 0.353mm through detection coil of strip hyacinth bean height after coil of strip is offline；Very thin decorative pattern
The mechanical property of plate：Tensile strength 755MPa, yield strength 680MPa, elongation 23%.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that：Still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (10)
1. a kind of milling method of intensity 750MPa grades of very thin diamond plates, which is characterized in that the milling method includes heating, being thick
It rolls, finishing rolling step；The finishing rolling step, exit temperature at finishing are 850~870 DEG C, and finish rolling threading speed is 10.0~11.2m/
s。
2. a kind of milling method of intensity 750MPa grades of very thin diamond plates according to claim 1, which is characterized in that described
Finishing rolling step is rolled using 7 racks, and each rack AGC pressing speed is adjusted in the electrical program of level-one, and the AGC of preceding 4 racks is dynamic
Make speed≤7 × 10-4Movement speed≤4 × 10 m/s, rear 3 rack AGC-4m/s。
3. a kind of milling method of intensity 750MPa grades of very thin diamond plates according to claim 1, which is characterized in that described
Finishing rolling step adjusts each rack AGC pressure amplitude in the electrical program of level-one, and the AGC of the 1st rack depresses amplitude≤1.5mm,
Upper lift amplitude≤2.0mm；The AGC of last rack depresses amplitude≤0.3mm, upper lift amplitude≤0.4mm.
4. a kind of milling method of intensity 750MPa grades of very thin diamond plates according to claim 1, which is characterized in that described
Finishing rolling step compensates the dynamic velocity drop of each rack of finish rolling, guarantees the decline of speed caused by rack dynamic velocity drop in 200s
Interior recovery normal value.
5. a kind of milling method of intensity 750MPa grades of very thin diamond plates according to claim 1, which is characterized in that described
Finishing rolling step increases leading portion rack reduction ratio, guarantees overall reduction ratio >=85% of preceding 3 racks.
6. a kind of milling method of intensity 750MPa grades of very thin diamond plates described in -5 any one according to claim 1, special
Sign is, the heating process, and slab goes out furnace temp >=1260 DEG C, the sum of the second bringing-up section and soaking zone heating time >=
80min, slab lead to the plate temperature difference≤20 DEG C.
7. a kind of milling method of intensity 750MPa grades of very thin diamond plates described in -5 any one according to claim 1, special
Sign is that the roughing operation, roughing uses 5 passes, extreme trace time and roughing outlet temperature >=1100 DEG C, after roughing rolling
Workpiece thickness in 32~34mm.
8. a kind of milling method of intensity 750MPa grades of very thin diamond plates described in -5 any one according to claim 1, special
Sign is, the very thin diamond plate of 750MPa grade of the method production with a thickness of 1.2~1.6mm.
9. a kind of milling method of intensity 750MPa grades of very thin diamond plates described in -5 any one according to claim 1, special
Sign is that the mechanical property of the very thin diamond plate of 750MPa grade of the method production is：750~795MPa of tensile strength, surrender
615~680MPa of intensity, elongation 15~23%.
10. a kind of milling method of intensity 750MPa grades of very thin diamond plates described in -5 any one according to claim 1, special
Sign is, 0.2~0.4mm of hyacinth bean height of the very thin diamond plate of 750MPa grade of the method production.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474070.9A CN108856291A (en) | 2018-05-17 | 2018-05-17 | A kind of milling method of intensity 750MPa grades of very thin diamond plates |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474070.9A CN108856291A (en) | 2018-05-17 | 2018-05-17 | A kind of milling method of intensity 750MPa grades of very thin diamond plates |
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| CN112317536A (en) * | 2020-09-30 | 2021-02-05 | 日照钢铁控股集团有限公司 | Manufacturing method of pattern plate with extremely thin specification |
| CN113102497A (en) * | 2021-03-25 | 2021-07-13 | 北京科技大学 | Process method for reducing falling of oxide scales on surface of hot-rolled checkered plate |
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| CN113102497A (en) * | 2021-03-25 | 2021-07-13 | 北京科技大学 | Process method for reducing falling of oxide scales on surface of hot-rolled checkered plate |
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Application publication date: 20181123 |