CN113333466B - Rolling process of reversible cold rolling mill - Google Patents
Rolling process of reversible cold rolling mill Download PDFInfo
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- CN113333466B CN113333466B CN202110728737.5A CN202110728737A CN113333466B CN 113333466 B CN113333466 B CN 113333466B CN 202110728737 A CN202110728737 A CN 202110728737A CN 113333466 B CN113333466 B CN 113333466B
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- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
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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
- 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
- B21B2015/0064—Uncoiling the rolled product
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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
- B21B2015/0092—Welding in the rolling direction
Abstract
The invention provides a rolling process of a reversible cold rolling mill, which is characterized in that a welding device is added between a pre-uncoiler and an inlet uncoiler, after rolling one coil of steel, the tail part of the previous coil of steel is welded with the head part of the next coil of steel, a shearing device is used for shearing and splitting coils at the position of the super-thick tail part of the coil of steel, and then the next coil of steel is normally rolled. The rolling process has simple procedures, reduces the strip leading procedure of rolling at each time, does not need to weld the head and the tail of the coil steel at the same time, only needs to weld once when the coil steel is rolled, reduces the welding time, can reduce one ultra-thick rolling head for each cold-rolled coil by the rolling mode, forms strip-tail-free rolling, and has good economic benefit.
Description
Technical Field
The invention relates to the field of metal processing, in particular to a rolling process of a reversible cold rolling mill.
Background
The rolling of cold-rolled wide strip steel is divided into two cases of continuous rolling and reversible rolling, and in general, the former rolling is formed by connecting a plurality of stands in series, for example, rolling is performed by adopting a 5-stand or 6-stand method. The production characteristics are as follows: in the production process, all hot rolled coils are connected together through an acid washing-rolling mill on line through a welding machine and pass through all stands of the rolling mill at one time, and then welding seam coil splitting is carried out at the tail part of the rolling mill. However, the rolling mill has huge investment, the pickling-rolling mill combined unit has wide floor space, more factory buildings and supporting facilities, and higher requirements on production personnel and management level.
The steel rolling mode of the reversible rolling mill is to use a single stand or double (two) stands to roll the hot rolled strip steel after pickling back and forth, and has the characteristics of small investment scale, relatively simple production process and relatively flexible operation. However, since the coiling machines are arranged at the inlet and the outlet of the rolling mill, in order to provide enough tension and ensure the normal reversible rolling of the strip steel, each cold-rolled steel coil has a certain length of super-thick part which is left on the uncoiling machine and the coiling machine. At present, each cold-rolled coil of a double-rack rolling mill of most domestic rolling systems has super-thick parts with the head and the tail of each cold-rolled coil being more than 30 meters long and not meeting the product requirements, so that the yield of the steel coils is low, and the production cost is greatly wasted.
In order to solve the technical problem, some technical solutions have been proposed in the prior art, for example, CN101264487A discloses a process for increasing the yield of a reversible cold-rolled steel strip, which reduces the time for occupying the unit by welding leading strips by means of welding leading strips at the head and the tail of the steel strip before and after production in an acid pickling and annealing acid pickling unit before and after production of the reversible cold-rolled steel strip; CN101024267A discloses a method for welding a leading belt of a stainless steel coil, which is characterized in that the leading belt of the inner ring of the steel coil is welded at the tail part of an annealing and pickling unit, and the leading belt of the outer ring of the steel coil is welded by a simple preparation unit after the steel coil is unloaded; CN110355206A discloses a device and a production method for increasing the yield of a reversible rolling mill, wherein a length of leading tape is welded at the head and the tail of a quality steel coil, and the leading tape is wound on the inner rotating bodies of an uncoiler and a coiler and can be continuously and repeatedly used; although CN101835546A discloses a welder for rolling equipment and a rolling method, the welder is arranged on the side of an outlet winder, which results in that the rolling process is not easy to operate, and the rolling equipment also needs to be matched with a strip steel press, thus the equipment is complex.
Although the problem of yield can be solved to a certain extent among the above-mentioned prior art, or there is the complicated problem of equipment, or there is the problem that needs head and afterbody to weld the lead tape simultaneously and lead to technology loaded down with trivial details. Therefore, in the art, there is a need for a simple reversible rolling process to increase the yield of the product.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a rolling process of a reversible cold rolling mill, which is used for simply and efficiently rolling strip steel.
The application provides a rolling process of a reversible cold rolling mill, which comprises the following steps:
step 1: arranging a welding device between a pre-uncoiler and an inlet uncoiler of the reversible cold-rolling mill;
step 2: cold rolling the preorder steel coil;
and step 3: after the preorder steel coil is rolled, the shearing device shears and divides the coil at the proper position of the preorder steel coil to form a preorder steel coil tail part;
and 4, step 4: the rolling mill is operated, the head of the subsequent steel coil and the tail of the previous steel coil are welded together through the welding device after the tail end of the previous steel coil is transported to the welding position;
and 5: and (5) repeating the step 2-4, and rolling the rest coil steel.
In above-mentioned technical scheme, through the head with the epilogue coil of strip and the afterbody welding of preorder coil of strip, make the afterbody of preorder coil of strip play the tape guide effect, the characteristics of the reversible cold rolling mill flexible operation of make full use of for the welding of coil of strip head and afterbody is simple, through this kind of rolling mode, can be so that every cold rolling coil all only has a rolling head, realizes not having the super thick rolling of tape trailer to promote the benefit greatly.
It should be noted that the proper position in step 3 refers to a boundary between the tail super-thick position and the thickness meeting the specification of the finished steel strip, that is, the shearing is performed at the thickness meeting the specification of the finished steel strip.
According to the technical scheme, after the steel coil is rolled, the shearing step is firstly carried out, and then the welding step is carried out. The specific operation mode of the rolling mill for transporting the tail end part of the preorder steel coil to the welding position in the step 4 is as follows: when the tail length L1 of each rolled steel coil is greater than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the outlet coiling machine, and the tail end of the steel coil left after shearing and splitting is conveyed to the welding position; and when the tail length L1 of each rolled steel coil is smaller than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the inlet uncoiler, and the tail end of the coil left after shearing and uncoiling is transported to the welding position.
The length L1 of the tail part is greater than the distance L2 between the welding device and the shearing device, which indicates that the end part of the tail part of the steel coil does not reach the welding position after the steel coil is sheared, therefore, the rolling mill needs to be started to advance to drive the tail part of the steel coil to reach the welding position; the length L1 of the tail part is less than the distance L2 between the welding device and the shearing device, which indicates that the end part of the tail part of the steel coil passes through the welding position after the steel coil is sheared, therefore, the rolling mill needs to be started to retreat to drive the tail part of the steel coil to reach the welding position.
The application provides a reversible cold rolling mill rolling process in a second mode, which comprises the following steps:
step 1: arranging a welding device between a pre-uncoiler and an inlet uncoiler of the reversible cold-rolling mill;
step 2: cold rolling the preorder steel coil;
and step 3: after the pre-arranged steel coil is rolled, operating a rolling mill, transporting the end part of the uncut tail part of the pre-arranged steel coil to a welding position, and welding the head part of the subsequent steel coil and the tail part of the pre-arranged steel coil through a welding device;
and 4, step 4: operating a rolling mill to transport the welded preorder steel coil to a shearing position, and shearing and coiling the preorder steel coil at a proper position of the preorder steel coil by a shearing device;
and 5: and (5) repeating the step 2-4, and rolling the rest coil steel.
In the technical scheme, after the steel coil is rolled, the welding step is firstly carried out, and then the shearing step is carried out.
The specific operation mode that the rolling mill transports the welded preorder steel coil to the shearing position in the step 4 is as follows: when the length L1 of the tail part of each rolled steel coil is larger than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the inlet uncoiler, and the welded pre-rolled steel coil is transported to the shearing position; when the rolled tail length L1 of each coil of steel is less than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the outlet coiling machine, and the welded previous coil of steel is transported to the shearing position.
The length L1 of the tail part is greater than the distance L2 between the welding device and the shearing device, which indicates that after the steel coil is welded, the position of the steel coil suitable for shearing has already passed through the shearing device, so the rolling mill needs to be started to retreat to drive the steel coil to reach the shearing device; the length L1 of the tail part is smaller than the distance L2 between the welding device and the shearing device, which indicates that after the steel coil is welded, the position of the steel coil suitable for shearing does not reach the shearing device, and the rolling mill needs to be started to advance to drive the steel coil to reach the shearing device.
In some alternative embodiments, the L1 has a length of 30-40 meters and the L2 has a length of 30-40 meters.
The application provides a reversible cold rolling mill rolling process under a third mode, including the following steps:
step 1: arranging a welding device between a pre-uncoiler and an inlet uncoiler of the reversible cold rolling mill, wherein the welding device can move between the pre-uncoiler and the inlet uncoiler along a steel strip;
step 2: cold rolling the preorder steel coil;
and step 3: after the preorder steel coil is rolled, the shearing device shears and divides the coil at the proper position of the preorder steel coil to form a preorder steel coil tail part;
and 4, step 4: the welding device moves, the head of the subsequent steel coil and the tail of the previous steel coil are welded together through the welding device after the end part of the tail of the previous steel coil is arranged at the welding position;
and 5: and (5) repeating the step 2-4, and rolling the rest coil steel.
In the technical scheme, the welding device is arranged to be movable, the welding device can be flexibly moved according to the tail end position of the sheared steel coil strip, so that the tail of the steel coil strip can rapidly reach the welding position, the operation of a rolling mill is avoided, and the flexibility of the rolling process is improved.
Preferably, the range of movement of the welding device is limited between the pre-unwinder and the unwinder.
Further, when welding cannot be achieved by moving the welding device alone, the movement of the welding device and the rotation of the rolling mill can be matched with each other, and the tail end of the pre-positioned steel coil is placed at the welding position.
Furthermore, the scheme also comprises a step of rolling the first rolled steel, and because the strip tail of the steel strip without a preorder is welded when the first rolled steel is rolled, the head of the first rolled steel needs to be welded with the steel strip and then the strip is threaded for rolling.
Further, the first coil steel head weld strip may be welded using a welding device disposed between the pre-uncoiler and the entry uncoiler of the reversible cold rolling mill.
Further, the cold rolling mill may be a single stand or a double stand.
The beneficial effects of the application comprise the following aspects:
(1) the process is simple, extra leading strips are needed except for the first rolled steel coil, the heads and the tails of the adjacent batches of steel coils are welded and connected when the other batches of steel coils are rolled, and the tail of the previous steel coil penetrates into the reversible cold rolling mill, so that the leading strip process of each rolling is reduced; the head and the tail of the coil steel do not need to be welded simultaneously, and only one welding is needed when each coil of steel is rolled, so that the welding time is reduced;
(2) the operation is flexible, and the rolling sequence can be flexibly selected according to the tail length L1 and the distance L2 between the welding device and the shearing and curling device;
(3) the equipment is easy to modify, the manufacturing cost and the maintenance cost are low, and only a welding device needs to be arranged between the pre-uncoiler and the inlet uncoiler;
(4) the method has good economic benefit, and each cold-rolled coil of the double-stand rolling mill has the head and the tail of the super-thick part which are dozens of meters long and do not meet the product requirement according to the analysis of one rolled material production line.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a flow chart of a rolling process of a prior art double stand cold rolling mill.
Fig. 2 is a flow chart of the rolling process of the double-stand cold rolling mill of the present application.
Fig. 3 is a flow chart of a rolling process of the double-stand cold rolling mill in embodiment 1 of the present application.
Fig. 4 is a flow chart of a rolling process of the double-stand cold rolling mill in embodiment 2 of the present application.
Fig. 5 is a flow chart of a rolling process of the double-stand cold rolling mill in embodiment 3 of the present application.
Fig. 6 is a flow chart of a rolling process of the double-stand cold rolling mill in embodiment 4 of the present application.
Fig. 7 is a flow chart of a rolling process of the double-stand cold rolling mill of embodiment 5 of the present application.
Icon: 1-pre-uncoiler, 2-welding device, 3-inlet uncoiler, 4-steel strip, 5-frame 1, 6-frame 2, 7-shearing device, 8-outlet coiler and 9-steel strip shearing position.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the application is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the application is used, is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or the element which is indicated must have a specific orientation, be configured and operated in a specific orientation, and therefore, cannot be understood as the limitation of the application. Furthermore, the terms "first," "second," and "third" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The embodiment of the application provides a rolling process of a reversible cold rolling mill, which can solve the problems of low product yield, complex rolling mill equipment, high cost and the like in the rolling process of the reversible rolling mill in the prior art. The following detailed description is to be read in connection with the accompanying drawings.
Referring to fig. 1 and 2, fig. 1 is a flow chart of a rolling process of a double-stand cold rolling mill in the prior art, and a pre-uncoiler 1, an inlet uncoiler 3, a No. 1 stand 5, a No. 2 stand 6, a shearing device 7 and an outlet coiler 8 are sequentially arranged from left to right. The steel coil is uncoiled through a pre-uncoiler 1 and an inlet uncoiler 3, enters a No. 1 rack 5 and a No. 2 rack 6 for reversible cold rolling, and is sheared and uncoiled by a shearing device 7 after a steel belt 4 is rolled to a proper specification. In the reversible cold rolling process in the mode, leading strips are welded at the head and the tail of each coil of steel, or each coil of steel forms an ultra-thick part flow at the head and the tail of the coil of steel, and the ultra-thick part flow is arranged on the inlet uncoiler 3 and the outlet coiler 8.
Fig. 2 is a rolling process flow diagram of the double-stand cold rolling mill of the invention, which is sequentially provided with a pre-uncoiler 1, a welding device 2, an inlet uncoiler 3, a No. 1 stand 5, a No. 2 stand 6, a shearing device 7 and an outlet coiler 8 from left to right. One of the differences from the prior art is that a welding device 2 is arranged between the pre-uncoiler 1 and the inlet uncoiler 3, and the tail part and the subsequent head part of the previous steel coil in the rolling process are welded once through the welding device 2. The tail part of the preorder steel coil passes through the No. 1 rack 4 and the No. 2 rack 5 (namely is in a threading state), so that the threading step of each rolling can be saved, and the working efficiency can be improved.
Example 1
On a jaw steel cold rolling production line, each cold rolling coil of a rolling material system double-rack rolling mill has an ultra-thick part which has the head and the tail of 35 meters and does not meet the product requirement, a pre-uncoiler 1 and an inlet uncoiler 3 are provided with welding devices 2, and the distance between each welding device 2 and a shearing device 7 is 30 meters.
The rolling process comprises the following steps:
step 1: when starting up production, the head of the first steel coil is welded by a section of strip steel with the length of 35 meters to complete threading;
step 2: after the first coil is produced, the shearing device 7 only needs to shear and separate the tail part of the first coil at a position meeting the requirement of the product thickness, as shown in fig. 3, after the first coil is sheared and separated, because the length L1 of the tail part of the steel coil is greater than the distance L2 between the welding device 2 and the shearing device 7, the tail end part of the steel coil does not reach the welding position;
and step 3: continuously starting the rolling mill to enable the rolling mill to rotate along the direction of the outlet coiling machine 6, and transporting the tail end part of the first coil of steel coil left after shearing and splitting to the welding position of the welding device 2;
and 4, step 4: installing a second coil of steel, welding the head of the second coil with the tail of the first coil of the ultra-thick strip steel through the welding device 2, and performing normal production rolling on the second coil;
and 5: the second roll cutting and splitting and the third roll rolling are performed separately in the above manner. By analogy, the batch rolling of the cold-rolled steel coils can be smoothly ensured, so that one super-thick rolling head is reduced for each cold-rolled coil.
Example 2
On a galvanized plate production line of jaw steel, each cold-rolled coil of a double-stand rolling mill of a rolling system has an ultra-thick part with the head and the tail of each cold-rolled coil being more than 35 meters long and not meeting the product requirement, welding devices 2 are arranged on a pre-uncoiler 1 and an inlet uncoiler 3, and the distance between the welding devices 2 and a shearing device 7 is 40 meters.
The rolling process comprises the following steps:
step 1: when starting up production, the head of the first steel coil is welded by a section of strip steel with the length of 35 meters to complete threading;
step 2: after the first coil is produced, the cutting device 7 only needs to cut and separate the tail part of the first coil at a position meeting the product thickness requirement, as shown in fig. 4, after the first coil is cut and separated, because the length L1 of the tail part of the steel coil strip is smaller than the distance L2 between the welding device 2 and the cutting device 7, the tail end part of the steel coil strip passes through the welding position;
and step 3: continuously starting the rolling mill to enable the rolling mill to rotate towards the direction of the uncoiler 3, and transporting the tail end part of the first coil of steel coil left after shearing and uncoiling to the welding position of the welding device 2;
and 4, step 4: installing a second coil of steel, welding the head of the second coil with the tail of the first coil of the ultra-thick strip steel through the welding device 2, and performing normal production rolling on the second coil;
and 5: the second roll cutting and splitting and the third roll rolling are performed separately in the above manner. By analogy, the batch rolling of the cold-rolled steel coils can be smoothly ensured, so that one super-thick rolling head is reduced for each cold-rolled coil.
Example 3
On a jaw steel cold rolling production line, each cold rolled coil of a rolling material system double-rack rolling mill has an ultra-thick part with the head and the tail of each cold rolled coil being 35 meters long and not meeting the product requirement, a pre-uncoiler 1 and an inlet uncoiler 3 are provided with a welding device 2, and the distance between the welding device 2 and a shearing device 7 is 30 meters.
The rolling process comprises the following steps:
step 1: when starting up production, the head of the first steel coil is welded by a section of strip steel with the length of 35 meters to complete threading;
step 2: after the first coil is produced, the rolling mill is continuously operated, and the tail end part of the uncut steel coil is transported to a welding position;
and 3, step 3: installing a second coil of steel, and welding the head of the second coil and the tail of the first coil of the super-thick strip steel by the welding device 2, as shown in fig. 5, after welding, because the length L1 of the tail of the steel coil is greater than the distance L2 between the welding device 2 and the shearing device 7, the shearing position 9 of the strip steel already passes through the shearing device 7;
and 4, step 4: continuously operating the rolling mill, enabling the rolling mill to rotate along the direction of the inlet uncoiler 3, transporting the welded first coil of steel coil to a shearing position, and shearing and uncoiling the first coil of steel coil at a position where the tail of the first coil meets the requirement of the thickness of a product by the shearing device 7;
and 5: the second roll cutting and splitting and the third roll rolling are performed separately in the above manner. By analogy, the batch rolling of the cold-rolled steel coils can be smoothly ensured, so that one super-thick rolling head is reduced for each cold-rolled coil.
Example 4
On a jaw steel cold rolling production line, each cold rolled coil of a rolling material system double-rack rolling mill has an ultra-thick part with the head and the tail of each cold rolled coil being 35 meters long and not meeting the product requirement, a pre-uncoiler 1 and an inlet uncoiler 3 are provided with a welding device 2, and the distance between the welding device 2 and a shearing device 7 is 40 meters.
The rolling process comprises the following steps:
step 1: when starting up production, the head of the first steel coil is welded by a section of strip steel with the length of 35 meters to complete threading;
and 2, step: after the first coil is produced, continuously operating the rolling mill, and transporting the tail end part of the uncut steel coil to a welding position;
and 3, step 3: installing a second coil of steel, and welding the head of the second coil with the tail of the first coil of the super-thick strip steel by the welding device 2, as shown in fig. 6, after welding, because the length L1 of the tail of the steel coil is less than the distance L2 between the welding device 2 and the shearing device 7, the shearing position 9 of the strip steel does not reach the shearing device 7 yet;
and 4, step 4: continuously operating the rolling mill to enable the rolling mill to rotate along the direction of the outlet coiling machine 8, transporting the welded pre-rolled steel coil to a shearing position, and shearing and splitting the steel coil at a position where the tail part of the first coil meets the requirement of the product thickness by the shearing device 7;
and 5: the second roll cutting and splitting and the third roll rolling are performed separately in the above manner. By analogy, the batch rolling of the cold-rolled steel coils can be smoothly ensured, so that one super-thick rolling head is reduced for each cold-rolled coil.
Example 5
On a jaw steel cold rolling production line, each cold rolled coil of a rolling system double-rack rolling mill has an ultra-thick part with the head and the tail of each cold rolled coil being 35 meters long and not meeting the product requirement, a pre-uncoiler 1 and an inlet uncoiler 3 are provided with a welding device 2, and the distance between the welding device 2 and a shearing device 7 can move, and the range is 30-40 meters.
The rolling process comprises the following steps:
step 1: when starting up production, the head of the first steel coil is welded by a section of strip steel with the length of 35 meters to complete threading;
and 2, step: after the first roll is produced, the shearing device 7 only needs to shear and split the roll at the position where the tail part of the first roll meets the requirement of the product thickness;
and step 3: installing a second coil of steel, as shown in fig. 7, moving the welding device 2, placing the end part of the tail part of the previous coil of steel in a welding position, and welding the head part of the subsequent coil of steel and the tail part of the previous coil of steel by the welding device 2;
and 4, step 4: the second roll cutting and splitting and the third roll rolling are performed separately in the above manner. By analogy, the batch rolling of the cold-rolled steel coils can be smoothly ensured, so that one super-thick rolling head is reduced for each cold-rolled coil.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. The rolling process of the reversible cold rolling mill is characterized by comprising the following steps of:
step 1: arranging a welding device between a pre-uncoiler and an inlet uncoiler of the reversible cold-rolling mill;
step 2: cold rolling the preorder steel coil;
and step 3: after the preorder steel coil is rolled, the shearing device shears and divides the coil at the proper position of the preorder steel coil to form a preorder steel coil tail part;
and 4, step 4: the rolling mill is operated, the head of the subsequent steel coil and the tail of the previous steel coil are welded together through the welding device after the tail end of the previous steel coil is transported to the welding position;
and 5: repeating the step 2-4, and rolling the rest coil steel;
in the welding process in the step 4, the operation mode of the rolling mill is as follows: when the tail length L1 of each rolled steel coil is greater than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the outlet coiling machine, and the tail end of the steel coil left after shearing and splitting is conveyed to the welding position; and when the tail length L1 of each rolled steel coil is smaller than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the inlet uncoiler, and the tail end of the coil left after shearing and uncoiling is transported to the welding position.
2. The reversible cold rolling mill rolling process of claim 1, wherein the length of L1 is 30-40 meters and the length of L2 is 30-40 meters.
3. The rolling process of the reversible cold rolling mill is characterized by comprising the following steps of:
step 1: arranging a welding device between a pre-uncoiler and an inlet uncoiler of the reversible cold-rolling mill;
step 2: cold rolling the preorder steel coil;
and step 3: after the pre-arranged steel coil is rolled, operating a rolling mill, transporting the end part of the uncut tail part of the pre-arranged steel coil to a welding position, and welding the head part of the subsequent steel coil and the tail part of the pre-arranged steel coil through a welding device;
and 4, step 4: operating a rolling mill to convey the welded preorder steel coil to a shearing position, and shearing and separating the coil at a proper position of the preorder steel coil by a shearing device;
and 5: repeating the step 2 to the step 4, and rolling the rest coil steel;
in the step 4, the operation mode of the rolling mill is as follows: when the rolled tail length L1 of each coil of steel is greater than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the inlet uncoiler, and the welded previous coil of steel is conveyed to a shearing position; and when the rolled tail length L1 of each coil of steel is less than the distance L2 between the welding device and the shearing device, the rolling mill is continuously started to rotate along the direction of the outlet coiling machine, and the welded previous coil of steel is conveyed to a shearing position.
4. The reversible cold mill rolling process of claim 3, wherein the length of L1 is 30-40 meters and the length of L2 is 30-40 meters.
5. The rolling process of the reversible cold rolling mill is characterized by comprising the following steps of:
step 1: arranging a welding device between a pre-uncoiler and an inlet uncoiler of the reversible cold rolling mill, wherein the welding device can move between the pre-uncoiler and the inlet uncoiler along a steel strip;
step 2: cold rolling the preorder steel coil;
and step 3: after the preorder steel coil is rolled, the shearing device shears and divides the coil at the proper position of the preorder steel coil to form a preorder steel coil tail part;
and 4, step 4: the welding device moves, the head of the subsequent steel coil and the tail of the previous steel coil are welded together through the welding device after the end part of the tail of the previous steel coil is arranged at the welding position;
and 5: repeating the step 2-4, and rolling the rest coil steel;
in the step 4, the welding device moves to be matched with the rolling mill to rotate, and the tail end of the pre-arranged steel coil is placed at the welding position.
6. The rolling process of the reversible cold rolling mill according to any one of claims 1 to 5, characterized in that the rolling process comprises a step of rolling a first coil of steel, wherein the first coil of steel is rolled by threading a steel strip after welding the head of the steel coil with the steel strip.
7. The rolling process of a reversible cold rolling mill according to claim 6, characterized in that the steel coil head welding strip is welded with a welding device arranged between the pre-uncoiler and the entry uncoiler of the reversible cold rolling mill.
8. The reversible cold rolling mill process of any one of claims 1 to 5, wherein the cold rolling mill is a single stand or a double stand.
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