CN110314934B - Flying shear control method for cold rolling mill - Google Patents
Flying shear control method for cold rolling mill Download PDFInfo
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- CN110314934B CN110314934B CN201810295397.XA CN201810295397A CN110314934B CN 110314934 B CN110314934 B CN 110314934B CN 201810295397 A CN201810295397 A CN 201810295397A CN 110314934 B CN110314934 B CN 110314934B
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- strip steel
- speed
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- pinch roll
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
Abstract
The invention relates to a flying shear control method for a cold rolling mill, and belongs to the technical field of control equipment or methods specially suitable for metal rolling mills or processed products thereof. The method comprises the following steps: 1) starting the pinch roll, the magnetic belt and the coiling machine, and setting corresponding running speeds; 2) when the pinch roll reaches the set running speed, the upper and lower rolls of the pinch roll run against the roll; 3) if the pressure value between the upper roller and the lower roller of the pinch roller is reached, the magnetic belt reaches the running speed, and the coiling machine reaches the running speed, the flying shear shears the strip steel; 4) the pinch roll clamps the strip head to complete strip threading; the magnetic belt adsorbs the belt head, and the belt head is sent to a coiling machine and a wrapper; 5) and after the coiling machine coils the strip steel to establish tension, the coil splitting process is finished, and the next coil splitting action is waited. Before the flying shears do shearing action, the invention sets three necessary conditions for whether the action is implemented or not, thereby greatly reducing the risk of coil splitting at the outlet of the rolling mill and reducing the production accidents of the rolling mill caused by coil splitting failure.
Description
Technical Field
The invention relates to a flying shear control method for a cold rolling mill, and belongs to the technical field of control equipment or methods specially suitable for metal rolling mills or processed products thereof.
Background
At present, on a cold rolling continuous rolling production line of which the finished product is a steel coil, the production line carries out coil splitting control on strip steel when running at low speed, and the continuous production of a rolling mill is realized. In order to realize the stable operation of outlet equipment, smoothly shear the strip steel without stopping the machine and send the strip head between the coiling assistor and the coiling machine to finish the coiling action, the control of outlet equipment such as a clamping roller, a flying shear, a magnetic belt, a coiling assistor belt, a coiling machine and the like has high requirements. In the prior art, an outlet coil splitting automatic step of a rolling mill is triggered according to the condition that a strip steel welding seam passes through a third rack of the rolling mill, an outlet pinch roll rotates and rises, a magnetic belt starts to rotate, a coiling machine starts to rotate, and three devices start to act simultaneously. And when the three devices are started at the time t, namely the strip steel welding seam passes through the flying shear area, the flying shear performs shearing action. When the continuous production of the rolling mill is realized, the faults of continuous production interruption, such as accumulation of strip steel in front of the pinch roll, pause of strip heads in a flying shear area, adsorption of the strip heads on the magnetic belt, accumulation between the flying shear and the magnetic belt, and breakage of the strip steel in the tension building process, can occur.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method of flying shears of a cold rolling mill aiming at the defects of the prior art.
The technical scheme provided by the invention for solving the technical problems is as follows: a flying shear control method of a cold rolling mill comprises the following steps:
1) synchronously starting the pinch roll, the magnetic belt and the coiling machine, and setting corresponding running speeds;
2) when the pinch roll reaches the operation speed set in the step 1, a lifting oil cylinder of the pinch roll acts to lift the lower roll of the pinch roll, so that the upper roll and the lower roll of the pinch roll run against the roll;
3) if the preset pressure value is achieved between the upper roller and the lower roller of the pinch roller, the magnetic belt reaches the operating speed set in the step 1, and the coiler reaches the operating speed set in the step 1, the flying shears can shear the strip steel according to the preset gap;
if the upper and lower rollers of the pinch roller do not reach a preset pressure value, or the magnetic belt does not reach the operating speed set in the step 1, or the coiling machine does not reach the operating speed set in the step 1, the flying shear does not carry out shearing action, and equipment which does not reach the operating speed is checked;
4) after shearing, the pinch roll clamps the strip head to complete strip threading; the magnetic belt adsorbs the belt head, and the belt head is sent to a coiling machine and a wrapper;
5) after the tension is built up when the coiling machine coils the strip steel, the lower pinch roll can descend and stop rotating, and the magnetic belt can stop rotating; and (4) finishing the coil splitting process of the cold rolling mill, recovering normal rolling, and waiting for the next coil splitting action.
The improvement of the technical scheme is as follows: the operation speeds of the pinch roll, the magnetic belt and the coiling machine set in the step 1, the preset pressure value between the upper roll and the lower roll of the pinch roll and the preset gap of the flying shear are determined according to the specification of the strip steel to be coiled and the operation speed of the strip steel.
The improvement of the technical scheme is as follows: when the specification of the strip steel is larger than 0.35mm, the running speed of the pinch roll is 103-105% of the speed of the strip steel, and 103% is preferably selected; the running speed of the magnetic belt is 112-118% of the speed of the strip steel, and 115% is preferably selected; the running speed of the coiler is 103% -106% of the strip steel speed, and 105% is preferably selected; the preset pressure value between the upper roller and the lower roller of the pinch roller is 4 Mpa-4.2 Mpa, and 4.2Mpa is preferentially selected for pinch-off strip steel of the pinch roller; the flying shears shear the strip steel with a gap of 0.04 mm-0.08 mm, and preferably select a gap of 0.06 mm;
when the specification of the strip steel is less than 0.35mm, the running speed of the pinch roll is 100% -104% of the strip steel speed, and 102% is preferably selected; the running speed of the magnetic belt is 105% -112% of the speed of the strip steel, and preferably 110%; the running speed of the coiler is 104% -108% of the strip steel speed, and 107% is preferably selected; the preset pressure value between the upper roller and the lower roller of the pinch roller is 3.8-4.5 Mpa, and 4.4Mpa is preferably selected; the flying shears shear the strip steel with a gap of 0.022 mm-0.027 mm, and preferably with a gap of 0.025 mm.
The invention adopts the technical scheme that the method has the beneficial effects that: before the flying shears do shearing action, three necessary conditions are set for whether the action is implemented or not, and if the three conditions can be simultaneously met, the shearing action of the flying shears is carried out. Different from the original triggering mode of the shearing action of the flying shears, the triggering condition used by the invention comprehensively considers the matching relationship between the devices on the continuous rolling mill when the equipment performs the coil splitting operation, not only considering the running position of the strip steel and the state of the flying shears as in the prior art, but also considering the running matching between the devices from the whole situation, thereby solving the faults of continuous production interruption such as strip steel piling in front of a pinch roll, strip head stagnation on a magnetic belt, strip steel breaking in the process of strip steel tension building and the like in the process of continuous production of a cold rolling acid rolling unit. Greatly reducing the risk of coil splitting at the outlet of the rolling mill and reducing the production accidents of the rolling mill caused by coil splitting failure.
Drawings
The invention will be further explained with reference to the drawings.
Fig. 1 is a flowchart of a flying shear control method of a cold rolling mill according to an embodiment of the present invention.
Detailed Description
Examples
The flying shear control method of the cold rolling mill of the embodiment, as shown in fig. 1, executes the following steps:
1) synchronously starting the pinch roll, the magnetic belt and the coiling machine, and setting corresponding running speeds;
2) when the pinch roll reaches the operation speed set in the step 1, a lifting oil cylinder of the pinch roll acts to lift the lower roll of the pinch roll, so that the upper roll and the lower roll of the pinch roll run against the roll;
3) if the preset pressure value is achieved between the upper roller and the lower roller of the pinch roller, the magnetic belt reaches the operating speed set in the step 1, and the coiler reaches the operating speed set in the step 1, the flying shears can shear the strip steel according to the preset gap;
if the upper and lower rollers of the pinch roller do not reach a preset pressure value, or the magnetic belt does not reach the operating speed set in the step 1, or the coiling machine does not reach the operating speed set in the step 1, the flying shear does not carry out shearing action, and equipment which does not reach the operating speed is checked;
4) after shearing, the pinch roll clamps the strip head to complete strip threading; the magnetic belt adsorbs the belt head, and the belt head is sent to a coiling machine and a wrapper;
5.) when the coiling machine coils the strip steel to establish tension, the lower pinch roll can descend and stop rotating, and the magnetic belt can stop rotating; and (4) finishing the coil splitting process of the cold rolling mill, recovering normal rolling, and waiting for the next coil splitting action.
The operation speeds of the pinch roll, the magnetic belt and the coiling machine set in the step 1, the preset pressure value between the upper roller and the lower roller of the pinch roll and the preset gap of the flying shears are determined according to the specification of the strip steel to be coiled and the operation speed of the strip steel.
When the specification of the strip steel is larger than 0.35mm, the running speed of the pinch roll is 103-105% of the strip steel speed, and 103% is preferably selected; the running speed of the magnetic belt is 112-118% of the speed of the strip steel, and 115% is preferably selected; the running speed of the coiler is 103% -106% of the strip steel speed, and 105% is preferably selected; the preset pressure value between the upper roller and the lower roller of the pinch roller is 4 Mpa-4.2 Mpa, and 4.2Mpa is preferentially selected for pinch-off strip steel of the pinch roller; the flying shears shear the strip steel with a gap of 0.04 mm-0.08 mm, and preferably select a gap of 0.06 mm;
when the specification of the strip steel is less than 0.35mm, the running speed of the pinch roll is 100% -104% of the strip steel speed, and 102% is preferably selected; the running speed of the magnetic belt is 105% -112% of the speed of the strip steel, and preferably 110%; the running speed of the coiler is 104% -108% of the strip steel speed, and 107% is preferably selected; the preset pressure value between the upper roller and the lower roller of the pinch roller is 3.8-4.5 Mpa, and 4.4Mpa is preferably selected; the flying shears shear the strip steel with a gap of 0.022 mm-0.027 mm, and preferably with a gap of 0.025 mm.
In addition, the pinch rolls hold the strip at the correct speed and pressure and feed it forward during the decoiling process. The condition that the flying shear cannot cut in time due to the fact that the speed of the upper roll and the speed of the lower roll of the pinch roll are not matched with that of the backup roll due to the fact that the time point is early when the pinch roll rises or the time point is late when the pinch roll rises is avoided. The speed of the pinch roll at the outlet of the rolling mill is started from zero before the flying shear shears shear, the quick rising action is started after the rotating speed meets the speed difference condition higher than the speed of the strip steel, and after the pinch roll rises to the place (the pressure value is judged as a logic condition), the faults such as decoiling failure and the like can be avoided by controlling according to the logic sequence. The magnetic belt runs at a certain percentage faster than the band steel during the decoiling, the speed can not meet the requirement, the phenomenon that the band head is stopped on the magnetic belt can appear after decoiling, the band head and the belt of the band steel can be slipped due to the too high speed, and the magnetic adsorption band head is influenced. According to the setting of the refining control parameters of the strip steel with different specifications, the purpose of optimizing the coil splitting control of the outlet equipment is achieved, and the coil splitting effect is effectively improved.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (3)
1. A flying shear control method of a cold rolling mill is characterized by comprising the following steps:
1) synchronously starting the pinch roll, the magnetic belt and the coiling machine, and setting corresponding running speeds;
2) when the pinch roll reaches the operation speed set in the step 1, a lifting oil cylinder of the pinch roll acts to lift the lower roll of the pinch roll, so that the upper roll and the lower roll of the pinch roll run against the roll;
3) if the preset pressure value is achieved between the upper roller and the lower roller of the pinch roller, the magnetic belt reaches the operating speed set in the step 1, and the coiler reaches the operating speed set in the step 1, the flying shears can shear the strip steel according to the preset gap;
if the upper and lower rollers of the pinch roller do not reach a preset pressure value, or the magnetic belt does not reach the operating speed set in the step 1, or the coiling machine does not reach the operating speed set in the step 1, the flying shear does not carry out shearing action, and equipment which does not reach the operating speed is checked;
4) after shearing, the pinch roll clamps the strip head to complete strip threading; the magnetic belt adsorbs the belt head, and the belt head is sent to a coiling machine and a wrapper;
5) after the tension is built up when the coiling machine coils the strip steel, the lower pinch roll can descend and stop rotating, and the magnetic belt can stop rotating; and (4) finishing the coil splitting process of the cold rolling mill, recovering normal rolling, and waiting for the next coil splitting action.
2. The flying shear control method of the cold rolling mill according to claim 1, characterized in that: the operation speeds of the pinch roll, the magnetic belt and the coiling machine set in the step 1, the preset pressure value between the upper roll and the lower roll of the pinch roll and the preset gap of the flying shear are determined according to the specification of the strip steel to be coiled and the operation speed of the strip steel.
3. The flying shear control method of the cold rolling mill according to claim 2, characterized in that:
when the specification of the strip steel is larger than 0.35mm, the running speed of the pinch roll is 103-105% of the speed of the strip steel; the running speed of the magnetic belt is 112-118% of the speed of the strip steel; the running speed of the coiler is 103-106% of the speed of the strip steel; the preset pressure value between the upper roller and the lower roller of the pinch roller is 4 Mpa-4.2 Mpa; the flying shears shear the strip steel with a gap of 0.04 mm-0.08 mm;
when the specification of the strip steel is less than 0.35mm, the running speed of the pinch roll is 100-104% of the speed of the strip steel; the running speed of the magnetic belt is 105-112% of the speed of the strip steel; the running speed of the coiler is 104 to 108 percent of the strip steel speed; the preset pressure value between the upper roller and the lower roller of the pinch roller is 3.8 MPa-4.5 MPa; the flying shears shear the strip steel with a gap of 0.022 mm-0.027 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810295397.XA CN110314934B (en) | 2018-03-30 | 2018-03-30 | Flying shear control method for cold rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810295397.XA CN110314934B (en) | 2018-03-30 | 2018-03-30 | Flying shear control method for cold rolling mill |
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| CN110314934A CN110314934A (en) | 2019-10-11 |
| CN110314934B true CN110314934B (en) | 2020-09-22 |
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| CN113210438B (en) * | 2021-05-20 | 2023-03-24 | 广西北港不锈钢有限公司 | High-speed rolling method of stainless steel cold-rolled sheet |
| CN115608777A (en) * | 2022-08-15 | 2023-01-17 | 广西广盛新材料科技有限公司 | Control method, device and equipment for strip steel production and strip steel production system |
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| GB345088A (en) * | 1930-03-17 | 1931-03-19 | Morgan Construction Co | Improvements in or relating to controlling the shearing of moving material |
| CN102773256B (en) * | 2011-05-11 | 2015-04-08 | 上海宝信软件股份有限公司 | Optimal control method for strip tail shear by flying shear at continuous annealing unit inlet |
| CN103962384B (en) * | 2013-01-29 | 2016-01-20 | 宝山钢铁股份有限公司 | A kind of continuous hot-rolling mill dynamic shearing control method |
| CN105537271B (en) * | 2015-12-02 | 2017-05-31 | 北京佰能电气技术有限公司 | A kind of flying shear control system and its control method based on hot metal detector |
| CN106077093B (en) * | 2016-06-22 | 2017-12-26 | 首钢京唐钢铁联合有限责任公司 | A kind of flying shear back-end crop accuracy control method and device |
| CN107570786A (en) * | 2017-09-14 | 2018-01-12 | 阳春新钢铁有限责任公司 | A kind of flying shear control system and method |
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