CN219817471U - Production line for manufacturing high-speed wire rod of high-grade special steel - Google Patents

Abstract

The utility model relates to a production line for manufacturing high-speed wire rods of high-speed steel, which belongs to the technical field of high-speed wire rod production of high-speed steel, and solves the problems that the hole pattern design is inflexible, the dimensional precision of a product is high when rolling a fixed specification, but the high-precision rolling cannot be realized when changing the specification by arranging a finishing mill group and a reducing sizing mill group into a 1-to-2 form formed by dragging 2 rolling mills by a 1 motor or a 1-to-1 form formed by dragging 1 rolling mill by the 1 motor. When the climbing or large enclosing plate is arranged behind the pre-finishing mill group, the three-roller type guide groove structure is adopted, so that sliding friction is reduced, and scratch probability is reduced through rolling friction. Aiming at the surface quality scratch problem, the looper is a vertical looper before finish rolling, so that the scratch caused by the contact between a rolled piece and the surface of a roller way is reduced. Aiming at small-specification wires, the first section roller way after spinning adopts a close-packed roller form, so that the problem of steel clamping from head to tail is solved. The utility model realizes the flexible high-precision production of the high-speed wire rod of the high-grade special steel, and the surface quality of the wire rod is high.

Description

Production line for manufacturing high-speed wire rod of high-grade special steel

Technical Field

The utility model belongs to the technical field of high-speed wire rod production of high-speed high-grade steel, and relates to a production line for manufacturing the high-speed high-grade wire rod.

Background

The excellent steel wire is widely applied to key parts of automobile, bridge, heavy machinery, high-speed rail, aerospace and numerous metal product industries as one of important products in the steel industry, and in recent years, the yield is steadily increased.

The diameter range of the excellent steel wire rod product is generally 5-25 mm, and the main rolling line rolling unit generally mainly comprises: a rough rolling unit, a middle rolling unit, a pre-finishing mill unit, a finishing mill unit and a reducing sizing unit. The number of frames of the prior wire rod rough rolling unit, the middle rolling unit, the pre-finishing mill unit, the finishing mill unit and the reducing sizing mill unit is 6 frames, 8 frames and 4 frames respectively, and 30 frames are all arranged. If the sizing mill is not used, the number of the wire rod rough mill group, the middle mill group, the pre-finishing mill group and the finishing mill group is respectively 6 frames, 6 frames and 10 frames, and the total number of the frames is 28. For a high-speed wire rod finishing mill group and a reducing sizing mill group, a multi-frame concentrated transmission mode is generally adopted, namely, 1 motor drives a gear box through a transmission shaft, so that multi-frame linkage is realized, and the stability of a high-speed wire rod high-speed region rolling process is improved. With the further improvement of the requirements of customers on the surface quality of products, the mechanical properties of products with the dimensional accuracy and the production flexibility, the limitation of the solidification of the transmission form of the fertilization rolling mill set is that the arrangement and the production mode have the following problems:

1) Hole type parameters are solidified, and free adjustment of the roll gap of the frame cannot be realized;

2) When the partial machine of the finishing mill group is overhead, the machine frame can not be stopped when the middle and large-specification wire rod products are rolled, so that the energy consumption is increased;

3) When producing nonstandard wire products, the roll gap parameters of all the frames of the finishing mill group need to be adjusted, the adjustment difficulty is high, and the adjustment time is long;

4) The front looper of the finishing mill group is easy to scratch the surface of rolled piece;

5) Aiming at the problem that the control cooling before and after the finishing mill group and after the reducing sizing mill group can not be realized due to the short distance of part of production lines, part of customers are provided with large-sized trays to increase the length of the cooling control section, but rolled pieces are easy to scratch in the large-sized trays and the guide grooves;

6) And a climbing section is arranged between the partial production line and the finishing mill group after the finishing mill group is finished, so that the surface of a rolled piece is easy to scratch.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide a production line for producing high-speed wire of high-speed steel, which realizes flexible and high-precision production of high-speed wire of high-speed steel.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

a production line for manufacturing high-speed wire rods of high-grade special steel comprises a rough rolling unit, a rough rolling post flying shear, a middle rolling unit, a middle rolling post flying shear, a pre-finishing rolling unit, a pre-finishing rolling post cooling recovery section, a pre-finishing rolling pre flying shear, a pre-finishing rolling loop, a finishing rolling unit, a post-finishing rolling cooling recovery section, a pinch roll, a wire laying head, a cooling line and a coil collecting section which are sequentially arranged along a rolling direction, wherein the finishing rolling unit adopts a modularized form, and the modularized form is a 1-to-2 form formed by dragging 2 rolling mills by 1 motor or a 1-to-1 form formed by dragging 1 rolling mill by 1 motor; when the climbing section or the large surrounding plate is required to be arranged, the inlet and the outlet of the climbing section or the large surrounding plate adopt a three-roller type guide groove structure.

Optionally, a high-speed flying shear is arranged between the finish rolling post-cooling recovery section and the pinch roll.

Optionally, a reducing sizing unit is arranged between the finish rolling post-cooling recovery section and the pinch roll, the reducing sizing unit comprises a reducing sizing mill and a reducing sizing post-cooling recovery section which are sequentially arranged along the rolling direction, and the reducing sizing mill adopts a modularized form.

Optionally, the reducing mill comprises a reducing mill and a sizing mill which are sequentially arranged along the rolling direction, the reducing mill and the finishing mill adopt a 1-in-2 form, and the sizing mill adopts a 1-in-1 form.

Optionally, the last 2 rolling mills of the finishing train take the form of 1-to-1.

Optionally, the climbing section is disposed between the pre-finishing mill group and the post-finishing cooling recovery section.

Optionally, a large enclosure is provided between the pre-finishing mill train and the post-finish cooling recovery section.

Optionally, the first section roller way of the cooling line is a close-packed roller way, and the roller spacing of the close-packed roller way is 1 mm-8 mm.

Optionally, high-speed flying shears are arranged in front of and behind the reducing sizing unit.

Optionally, the loop is a vertical loop before finish rolling.

Optionally, the tension relationship between the modules is adjusted by the motor speed.

Alternatively, the tension relationship is adjusted by roll gap between rolling mills in a 1-to-2 form of module.

Optionally, the coil collecting section comprises a coil collecting station, a PF line, a bundling machine, a marking weighing station and a coil unloading station which are sequentially arranged along the rolling direction.

Optionally, a heating furnace is arranged in front of the roughing mill unit to heat the continuous casting billet through the heating furnace before roughing.

The utility model has the beneficial effects that:

1) The modular rolling mill is arranged, the finishing mill group and the reducing sizing mill group are arranged in a 1-to-2 mode formed by dragging 2 rolling mills by 1 motor or in a 1-to-1 mode formed by dragging 1 rolling mill by 1 motor, so that the problems that the size precision of a product is high when the specification is fixed due to inflexible hole pattern design, but the flexibility of high-precision rolling cannot be realized when the specification is changed are solved, the size precision of all series products is improved, and the flexible high-precision production of high-speed wires of excellent special steel is realized; the machine frame can be stopped when the machine frame is empty, so that the energy consumption is reduced, and the production cost is reduced;

2) When a climbing or large enclosing plate is arranged behind the pre-finishing mill group, a three-roller climbing roller way is adopted, so that sliding friction is reduced, scratch probability is reduced through rolling friction, scratch probability of the surface of a rolled piece during climbing of a production line is reduced, surface quality of the rolled piece is improved, processing cost of a subsequent finishing treatment procedure is reduced, and economic benefit of the whole production process of a product is improved;

3) The vertical loop is adopted to replace the traditional side loop before the finishing mill group, so that the contact between a rolled piece and the surface of a roller way is reduced, the problem of scratch on the surface of the rolled piece caused by the loop at the front side of the finishing mill group is reduced, the surface quality of wires is further improved, and the product performance is improved;

4) The densely arranged roller way is arranged at the front section of the cooling line, so that the problems of steel falling after spinning of small-specification high-speed wire products and steel clamping during running of the roller way of the cooling line are solved, the failure rate of equipment is reduced, the production stability is improved, and the utilization rate of a rolling mill is improved;

5) The production specification range of the product is wide, and all products with the specification range of phi 5.0 mm-phi 28.0mm can be produced.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of the high speed wire production line of the present utility model;

FIG. 2 is a schematic diagram of a three-roller guide slot structure of a climbing section or a large enclosure plate according to the present utility model;

FIG. 3 is a schematic diagram II of a three-roller guide groove of a climbing section or a large-enclosure plate of the utility model;

FIG. 4 is a schematic view of a 1-draw 1 version of the finishing mill of the modular form of the utility model;

FIG. 5 is a schematic view of the structure of the finishing mill group in modular form and of the reducing mill group in 1-tug-2 form according to the utility model;

FIG. 6 is a schematic diagram of the structure of the first section roller way of the cooling line of the utility model;

FIG. 7 is a schematic view of the elliptical hole pattern of the finishing mill and reducing mill of the modular form of the present utility model;

FIG. 8 is a circular schematic view of a finishing mill and reducing mill of the modular form of the present utility model.

Reference numerals: the hot rolling mill comprises a heating furnace 1, a roughing mill group 2, a roughing post flying shear 3, a middle rolling mill group 4, a middle rolling post flying shear 5, a pre-finishing mill group 6, a pre-finishing post cooling recovery section 7, a pre-finishing pre flying shear 8, a pre-finishing loop 9, a finishing mill group 10, a post-finishing post cooling recovery section 11, a high-speed reducing flying shear 12 before reducing sizing, a reducing mill group 13, a sizing mill group 14, a reducing sizing post cooling recovery section 15, a reducing sizing post high-speed flying shear 16, a pinch roll 17, a wire laying machine 18, a first section roller way 19, a cooling line cooling recovery section 20, a coil collecting station 21, a bundling collecting station 22, a guide wheel 31, a bracket 32, an inlet 33, a single-mode cone box 41, a single-mode roller box 42, a single-mode transmission shaft 43, a single-mode speed increasing box 44, a single-mode motor 45, a double-mode cone box 51, a double-mode roller box 52, a double-mode transmission shaft 53, a double-mode speed increasing box 54 and a double-mode motor 55.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.

Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 8, a production line for manufacturing high-speed wire rods of high-grade steel comprises a roughing mill group 2, a roughing-post flying shear 3, a middle mill group 4, a middle-post flying shear 5, a pre-finishing mill group 6, a pre-finishing-post cooling recovery section 7, a pre-finishing-pre flying shear 8, a pre-finishing-post loop 9, a finishing mill group 10, a post-finishing-cooling recovery section 11, a pinch roll 17, a wire laying head 18, a cooling line and a coil collecting section, wherein the finishing mill group 10 adopts a modularized form, and the modularized form is a 1-to-2 form formed by dragging 2 rolling mills by 1 motor or a 1-to-1 form by dragging 1 rolling mill by 1 motor.

The finishing mill group of the 1-to-1 type includes a single-mode cone box 41, a single-mode roller box 42, a single-mode drive shaft 43, a single-mode speed increasing box 44, and a single-mode motor 45, which are sequentially arranged, as shown in fig. 4. The finishing train in 1-2 form includes a twin cone box 51, a twin roll box 52, a twin drive shaft 53, a twin speed increasing box 54, and a twin motor 55, which are arranged in this order, as shown in FIG. 5.

Because the pass of the frame of the finishing mill group 10 is a group of two frames, no matter the mode of 1 to 1 or 1 to 2 is adopted, the machine halt of the empty frame can be realized, and the rolling precision is higher because the rolling speed of each group of pass can be independently adjusted. In addition, compared with the traditional finishing mill group adopting a centralized transmission mode, namely 1 tractor 8 or 1 tractor 10, under the transmission mode, under the condition of a certain motor rotating speed, the rotating speed and the rolling speed of the rollers of each frame are unchanged, the deformation of each frame is also fixed based on the principle of equal second flow, the hole pattern parameters of each frame are fixed, and the design is inflexible. Therefore, the utility model realizes the free adjustment of the roll gap of the frame, and solves the problems that the design of the hole pattern is inflexible, the dimensional precision of the product is high when the specification is fixed in rolling, but the flexibility of high-precision rolling cannot be realized when the specification is changed.

The finishing mill group 10 may be in the form of 1-to-2 or 1-to-1, or only the last two rolling mills may be in the form of 1-to-1, and the rest of the rolling mills may be in the form of 1-to-2.

By adopting a mode of 1 to 1, each rolling mill can be controlled independently, the rolling precision is higher, the operation is more complicated, the cost is higher, and the method is suitable for high-precision rolling. The two rolling mills in the same module have good synchronism by adopting a 1-to-2 mode, but each rolling mill cannot be controlled independently.

The tension relation between the modules can be adjusted through hole pattern change, and the tension relation can also be adjusted through motor rotation speed, but the hole pattern change of the tension relation is complex, the roller needs to be designed for turning and grinding again, the cost is high, and the most economical method is to adjust the motor rotation speed of the later. And under the condition of fixed hole patterns, the tension relation is adjusted through the roll gap between rolling mills in the 1-to-2 type modules.

The utility model not only realizes the stop of the empty frame, but also does not need to adjust the roll gap parameters of the empty frame of the finishing mill group when producing non-standard wire products, and the position of the empty frame is replaced by the empty guide pipe when the rolling mill is empty, so that the adjustment is simple, the debugging time is short, and the problem that the roll gap parameters of all frames of the finishing mill group need to be adjusted in the prior art is solved.

In order to improve the product quality, the utility model sets up the high-speed flying shears between cooling recovery section 11 and pinch roll 17 after finish rolling.

In order to produce wires with higher precision, a reducing sizing unit is arranged between the finish rolling post-cooling recovery section 11 and the pinch roll 17, and comprises a reducing sizing mill unit and a reducing sizing post-cooling recovery section 15 which are sequentially arranged along the rolling direction, wherein the reducing sizing mill unit adopts a modularized form. The reducing mill comprises a reducing mill 13 and a sizing mill 14 arranged in sequence in the rolling direction. The reducing mill 13, sizing mill 14 and finishing mill 10 may take the form of 1-to-2 or 1-to-1 simultaneously, or only sizing mill 14 may take the form of 1-to-1, with the remainder taking the form of 1-to-2.

In order to further improve the product quality, the high-speed flying shears are arranged in front of and behind the reducing and sizing unit.

In order to reduce the scratch on the surface of a rolled piece and improve the product quality, when the climbing section is arranged, a three-roller type guide groove structure is adopted for a climbing roller way of the climbing section. The three-roller type guide groove comprises a bracket 32 and 3 guide wheels 31 which are rotatably arranged on the bracket 32 and distributed at 120 degrees, and the circumference of each guide wheel 31 is provided with a groove to form a guide groove with the diameter slightly larger than that of a rolled piece, as shown in figures 2 and 3. By adopting the three-roller type guide groove structure, the sliding friction is reduced, the scratch probability is reduced through rolling friction, the surface quality of a rolled piece is improved, the processing cost of the subsequent finishing treatment process is reduced, and the economic benefit of the whole production process of the product is improved. The climbing section is preferably arranged between the pre-finishing mill group 6 and the post-finishing cooling recovery section 7. When the large enclosure plate is arranged, the inlet 3 and the outlet of the large enclosure plate also adopt a three-roller type guide groove structure. The large enclosure is preferably arranged between the pre-finishing mill group 6 and the post-finish cooling recovery section 7.

Aiming at the problem of head-to-tail steel clamping after wire laying of small-size wires phi 5.0 mm-phi 6.5mm, the utility model sets the first section roller way 19 of the cooling line (namely the first section roller way after wire laying) as a close-packed roller way, and the roller spacing of the close-packed roller way is 1 mm-8 mm, thereby effectively solving the problem of head-to-tail steel clamping and improving the production stability. The cooling line can be cooled by adopting an air cooling mode.

In order to reduce scratches on the surface of a rolled piece, the vertical loopers are adopted in the loopers 9 before finish rolling, so that scratches caused by contact between the rolled piece and the surface of a roller way are reduced, the surface quality of wires is further improved, and the product performance is improved.

The coil collecting section comprises a coil collecting station 21, a PF line and a bundling collecting station 22 which are sequentially arranged along the rolling direction, wherein the bundling collecting station 22 comprises a bundling machine, a marking weighing station and a coil unloading station which are sequentially arranged along the rolling direction.

A heating furnace 1 is further arranged in front of the roughing mill set 2 to heat the continuous casting billet through the heating furnace 1 before roughing.

The production line has low construction cost, is easy to realize industrial production, and has obvious economic benefit.

The high-speed wire rod of the high-grade special steel manufactured by the production line comprises the following steps of: heating, rough rolling, head and tail cutting after rough rolling, middle rolling, head and tail cutting after middle rolling, pre-finish rolling, controlled cooling after pre-finish rolling, head and tail cutting before finish rolling, controlled cooling after finish rolling, spinning and looping, cooling and coil collecting, and when part of the frame of the finishing mill group 10 of the finish rolling is empty, stopping the machine after the frame is emptied. Setting a climbing after pre-finish rolling, wherein the climbing section adopts a three-roller type guide groove structure for conveying, and the conveying speed of rolled pieces is 0.1-60.0 m/s; after finish rolling, a large enclosure plate is arranged, the large enclosure plate is conveyed by adopting a three-roller type guide groove structure, and the conveying speed of a rolled piece is the same as the speed of a finish rolling inlet and is not more than 30m/s. When the reducing sizing mill is required to roll, and when a part of the reducing sizing mill frame for reducing sizing is empty, the empty frame is stopped.

Specifically:

(1) Heating: heating a continuous casting billet by adopting a heating furnace 1, wherein the section of the continuous casting billet is 150mm multiplied by 150mm to 180mm multiplied by 180mm or an equal-area rectangular billet; the temperature of the casting blank after heating is 900-1250 ℃;

(2) And (3) rolling by a roughing mill set 2: and (3) performing 6-pass roughing mill pass rolling on the square billet heated in the step (1) by adopting a flat interchange or flat roll rolling mode, and performing 5-pass or 7-pass roughing mill pass rolling on the rectangular billet. When square billets are rolled, the hole type system is a box-ellipse-round hole type system; when a rectangular blank is rolled, the hole type system is a box-oval-round hole type system, guide devices are arranged in front of and behind each rolling mill, the deformation compression ratio of each pass is controlled to be 1.20-1.42 in the rolling process, the deformation temperature is 850-1230 ℃, and the running speed of a rolled piece in the rolling process of a roughing mill set 2 is 0.075-3.00 m/s;

(3) Rolling in a middle rolling mill group 4: rolling the rolled piece rolled by the roughing mill set 2 in the step (2) by a 4-8-pass intermediate mill set 4 after head and tail cutting, wherein a hole type system is an oval-round hole type system during rolling, guide devices are arranged at the front and the back of each rolling mill, the deformation compression ratio of each pass is controlled to be 1.20-1.40 during rolling, the deformation temperature is 850-1150 ℃, and the running speed of the rolled piece is 0.5-8.00 m/s;

(4) Rolling by a pre-finishing mill group 6: rolling the rolled piece rolled by the middle rolling mill group 4 in the step (3) by a 2-6 pass pre-finishing mill group 6 after head and tail cutting, wherein a hole type system is an oval-round hole type system during rolling, guide devices are arranged at the front and the back of each rolling mill, the deformation compression ratio of each pass is controlled to be 1.20-1.40 during rolling, the deformation temperature is 830-1100 ℃, and the running speed of the rolled piece is 2.0-25.00 m/s;

(5) Cooling is controlled after pre-finish rolling: and (3) carrying out multistage water tank control cooling on the rolled piece rolled by the pre-finishing mill group 6 in the step (4), wherein the number of cooling water tanks is 1-3, and the cooling capacity of a single water tank is 30-200 ℃ in consideration of recovery after water cooling. If a climbing or large-circle disc structure is needed after the finish rolling unit 6 is finished, the climbing guide groove adopts a three-roller guide wheel, and the inlet and the outlet of the large-circle disc also adopt the three-roller guide wheel structure;

(6) Rolling by a finishing mill group: the rolled piece after the control cooling in the step (5) is subjected to head and tail cutting, passes through a finish rolling front vertical loop 9 and then enters a 45 DEG top-cross cantilever modularized finishing mill group 10 for 2-8 times of rolling, the finishing mill group 10 adopts modularized rolling, each 2 frames are a module or each 1 frame is subjected to independent transmission, a hole type system is an oval-round hole type system during rolling, guides are arranged at the front and back of each rolling machine, stable rolling is realized among the frames through micro tension, the deformation compression ratio of each time is controlled to be 1.20-1.30 during rolling, the deformation temperature is 800-1050 ℃, and the running speed of the rolled piece is 5.0-95.00 m/s;

(7) Cooling is controlled after finish rolling: performing multistage water tank control cooling on rolled pieces rolled by the finishing mill group 10 in the step (6), and considering recovery after water cooling, wherein the number of cooling water tanks is 1-4, and the cooling capacity of a single water tank is 50-150 ℃;

(8) Reducing sizing mill rolling: the rolled piece after being controlled to be cooled in the step (7) is subjected to head and tail cutting through a high-speed flying shear 12 and then enters a 45-degree top-cross cantilever modularized reducing sizing mill for 2-4 times rolling, the reducing sizing mill adopts modularized rolling, each 2 frames are provided with a module or each 1 frame for independent transmission, a pass system for 4 times reducing and sizing rolling is provided with an oval-round-hole type system, a pass system for 2 times reducing rolling is provided with a guide and guard, stable rolling is realized among the frames through micro tension, the deformation compression ratio of each pass is controlled to be 1.10-1.30 in the rolling process of the reducing mill, the deformation compression ratio of each pass is controlled to be 1.01-1.15 in the rolling process of the sizing mill, the deformation temperature is 750-950 ℃, and the running speed of the rolled piece is 8.0-130.00 m/s;

(9) And (3) after the reducing sizing mill, cooling by control: performing multi-stage water tank control cooling on the rolled piece rolled by the reducing sizing mill in the step (8), and considering recovery after water cooling, wherein the number of cooling water tanks is 1-3, and the cooling capacity of a single water tank is 50-150 ℃;

(10) Laying head 18 laying wire into a loop: the rolled piece rolled by the reducing sizing mill in the step (9) is clamped by a pinch roll 17 and enters a wire-laying machine 18 for wire-laying and looping, a high-speed flying shear 16 is arranged in front of the pinch roll 17 to treat accidents and heads and tails, and the wire-laying temperature of the wire-laying machine 18 is 650-950 ℃;

(11) Cooling by a cooling line: the cooling line adopts an air cooling mode, the rolled piece after the spinning of the step (10) is carried out by the spinning machine 18 enters a first section roller way 19 of the cooling line, the rolled piece conveyed by the first section roller way 19 is cooled by a fan at a cooling recovery section of the cooling line, the transportation speed of the roller way of the cooling line is 0.2 m/s-2.5 m/s during cooling, and the temperature reduction speed of the rolled piece is 0.1-30 ℃/s during fan cooling;

(12) Collecting and collecting: and (3) collecting rolls of the rolled piece cooled by the fan in the step (11) through a double core rod or a vertical roll core frame, cooling through a PF line, and bundling, weighing, labeling, coil unloading and the like to finish warehousing and collection.

FIG. 7 is a schematic view of elliptical hole patterns of a finishing mill and a reducing mill in modular form, with A-hole pattern widths; r-hole type inner arc radius; r-chamfer radius; h-hole type half height; h-hole type height; e-roll gap.

FIG. 8 is a circular schematic view of a finishing mill and reducing mill in modular form, with A-hole widths; r-hole type inner arc radius; alpha-1/2 hole type circular arc angle compensation; h-hole type half height; h-hole type height; s-roll gap.

Example 1

A process for manufacturing a bearing steel GCr15 wire rod (without a climbing section and a large surrounding disc) having a diameter of 5.5mm, see fig. 1, 4 to 6, comprising: the method comprises the steps of rolling by a roughing mill group 2, rolling by a middle rolling mill group 4, cutting by a flying shear 5 after middle rolling, rolling by a pre-finishing mill group 6, cooling and recovering by a pre-finishing mill after a cooling and recovering section 7, establishing tension by a vertical loop 9 before finishing rolling, rolling by a modularized finishing mill group 10, cooling and recovering by a cooling and recovering section 11 after finishing rolling, cutting by a high-speed flying shear 12 after finishing rolling, rolling by a modularized reducing sizing mill group, cooling and recovering by a reducing sizing after a cooling and recovering section 15, cutting by a high-speed flying shear 16 after reducing sizing, clamping and conveying by a pinch roll 17, wire laying by a wire laying machine 18 for looping, conveying by a first-section roll table 19, cooling and recovering by a cooling line cooling and recovering section 20, collecting rolls by a roll collecting station 21, cooling by a PF line, bundling by a bundling machine, marking and weighing by a nominal weight station, and unloading by a roll unloading station, wherein the first-section roll table 19 is a close-packed roll table. The process is specifically as follows:

(1) Heating: heating GCr15 bearing steel continuous casting blank with the section of 150mm multiplied by 12000mm by adopting a heating furnace 1; the temperature of the casting blank after heating is 1250+/-30 ℃;

(2) And (3) rolling by a roughing mill set 2: carrying out grooved rolling on the square billet heated in the step (1) by adopting a flat interchange or flat roller rolling mode, wherein a grooved system is a box-type-box-elliptic-round hole system, guides are arranged at the front and rear of each rolling mill, the average compression ratio of the controlled pass deformation in the rolling process is 1.335, the diameter of a rolled piece after rolling is 72mm, the deformation temperature is 1000-110 ℃, the biting speed of a first rolled piece in rough rolling is 0.121m/s, and the running speed of a rolled piece at a rough rolling outlet is 0.689m/s in the rolling process of a rough rolling unit 2;

(3) Rolling in a middle rolling mill group 4: rolling the rolled piece rolled by the roughing mill set 2 in the step (2) by a 6-pass middle rolling mill set 4 after head cutting, wherein a pass system is an oval-round hole system during rolling, guides are arranged at the front and the rear of each rolling mill, the average compression ratio of the controlled pass deformation during rolling is 1.310, the diameter of the rolled piece after rolling is 32mm, the deformation temperature is 900-1100 ℃, the biting speed of the rolled piece of the first pass of middle rolling mill set 4 during rolling is 0.689m/s, and the running speed of the rolled piece of the outlet of the middle rolling mill is 3.487m/s;

(4) Rolling by a pre-finishing mill group 6: carrying out 6-pass pre-finishing mill group 6 rolling on the rolled piece rolled by the middle rolling mill group 4 in the step (3), wherein a pass system is an oval-round hole system during rolling, guides are arranged at the front and the rear of each rolling mill, the average compression ratio of the controlled pass deformation is 1.216 during rolling, the diameter of the rolled piece after rolling is 17.8mm, the deformation temperature is 900-1050 ℃, the biting speed of the first-pass rolled piece of pre-finishing mill is 3.487m/s during the rolling of the pre-finishing mill group 6, and the running speed of the pre-finishing mill outlet rolled piece is 11.27m/s;

(5) Cooling is controlled after pre-finish rolling: performing multistage water tank control cooling on the rolled piece rolled by the pre-finishing mill group 6 in the step (4), and considering recovery after water cooling, wherein the number of cooling water tanks is 2, the cooling capacity of a single water tank is 100 ℃, and the temperature of the rolled piece entering the next unit after recovery is 800-950 ℃;

(6) Rolling by a finishing mill group: the rolled piece after the control cooling in the step (5) is subjected to head and tail cutting, passes through a finish rolling front vertical loop 9 and then enters a 45-degree top-cross cantilever modularized finishing mill group 10 for 8-pass rolling, the finishing mill group 10 adopts modularized rolling, each 2 frames are provided with a module or each 1 frame for independent transmission, a hole pattern system is an oval-round hole system during rolling, guides are arranged at the front and back of each rolling machine, stable rolling is realized among the frames through micro tension, the average compression ratio of the control pass deformation is 1.254 during rolling, the diameter of the rolled piece after rolling is 7.2mm, the deformation temperature is 800-1050 ℃, the biting speed of the rolled piece of the first frame of finish rolling is 11.27m/s during the rolling of the finishing mill group, and the running speed of the rolled piece of a pre-finish rolling outlet is 68.89m/s;

(7) And (3) cooling after finishing mill group: performing multistage water tank control cooling on the rolled piece rolled by the finishing mill group in the step (6), and considering recovery after water cooling, wherein the number of cooling water tanks is 3, the cooling capacity of a single water tank is 150 ℃, and the temperature of the rolled piece entering the next unit after recovery is 750-900 ℃;

(8) Reducing sizing mill rolling: performing 4-pass rolling on the rolled piece subjected to control cooling in the step (7) through a high-speed flying shear 12 head-to-tail cutting and then performing 45-degree top-to-tail cantilever modularized reducing sizing mill, wherein the reducing sizing mill adopts modularized rolling, each 2 frames are provided with a module or each 1 frame is provided with independent transmission, a hole pattern system is an oval-round hole type system, stable rolling is realized among the frames through micro tension, the average pass deformation compression ratio is controlled to be 1.23 in the rolling process of the reducing mill, the deformation compression ratio is controlled to be 1.05 in the rolling process of the sizing mill, the deformation temperature is 750-950 ℃, the biting speed of the rolled piece of the reducing first frame is 68.89m/s in the rolling process of the reducing sizing mill, and the running speed of the rolled piece of the sizing outlet is 115m/s;

(9) And (3) after the reducing sizing mill, cooling by control: performing multi-stage water tank control cooling on the rolled piece rolled by the reducing sizing mill in the step (8), and considering recovery after water cooling, wherein the number of cooling water tanks is 2, the cooling capacity of a single water tank is 50 ℃, and the temperature of the rolled piece entering the wire laying head 18 after recovery is 750-900 ℃;

(10) Laying head 18 laying wire into a loop: clamping the rolled piece rolled by the reducing sizing mill in the step (9) by a pinch roll 17, feeding the clamped rolled piece into a wire-laying machine 18 for wire-laying and looping, and arranging a high-speed flying shear 16 in front of the pinch roll 17 to treat accidents and heads and tails, wherein the wire-laying temperature of the wire-laying machine 18 is 750-900 ℃;

(11) The cooling line 20 cools: the rolled piece after the spinning in the step (10) is spun by the spinning machine 18 enters a first section roller way 19 of a cooling line, the rolled piece conveyed by the first section roller way 19 is cooled by a fan in a cooling recovery section of the cooling line, the transportation speed of the roller way of the cooling line is 0.2 m/s-2.5 m/s during cooling, and the temperature reduction speed of the rolled piece cooled by the fan is 0.1-30 ℃/s;

(12) Collecting and collecting: and (3) carrying out double-core rod or vertical core frame coil collection on the rolled piece cooled by the fan in the step (11), carrying out bundling, weighing, labeling, coil unloading and the like after PF line cooling, and finishing warehouse entry collection, wherein the coil collection temperature is 400-550 ℃, and the bundling temperature is lower than 250 ℃.

Example 2

The process for manufacturing a bearing steel GCr15 wire rod (without climbing sections and large surrounding disks) having a diameter of 6.5mm, with reference to fig. 1, 4 to 6, differs from that of example 1 in that:

firstly, in the rolling stage of the roughing mill set 2: in the rolling process of the roughing mill unit 2, the biting speed of a first roughing rolled piece is 0.162m/s, and the running speed of a roughing outlet rolled piece is 0.920m/s;

secondly, in the rolling stage of the middle rolling mill group 4: in the rolling process of the middle rolling mill group 4, the biting speed of a first middle rolling mill piece is 0.920m/s, and the running speed of a middle rolling mill outlet rolling piece is 4.659m/s;

thirdly, in the rolling stage of the pre-finishing mill group 6: in the rolling process of the pre-finishing mill group 6, the biting speed of a first rack of secondary rolled pieces of the pre-finishing mill is 4.659m/s, and the running speed of a pre-finishing mill outlet rolled piece is 15.056m/s;

fourth, in the finishing mill group rolling stage: the rolled piece after controlled cooling through the finishing mill group is subjected to 6-pass rolling through the 45-degree top-cross cantilever modularized finishing mill group 10 after head and tail cutting and looper standing, the average compression ratio of the controlled pass deformation is 1.255 in the rolling process, the diameter of the rolled piece after rolling is 9.0mm, the biting speed of the rolled piece of the first frame of the finish rolling is 15.05m/s in the rolling process of the finishing mill group, and the running speed of the rolled piece of the pre-finish rolling outlet is 58.90m/s;

fifthly, in the rolling stage of the reducing sizing mill: the average pass deformation compression ratio is controlled to be 1.28 in the rolling process of the reducing mill, the deformation compression ratio of each pass is controlled to be 1.08 in the rolling process of the sizing mill, the biting speed of a first reducing mill is 58.90m/s, and the running speed of a sizing outlet mill is 115m/s;

example 3

The process for manufacturing a non-standard size bearing steel GCr15 wire (without climbing segments or large surrounding discs) with a diameter of 6.2mm, with reference to fig. 1, 4-6, differs from example 1 in that:

firstly, in the rolling stage of the roughing mill set 2: in the rolling process of the roughing mill set 2, the biting speed of a first roughing mill set is 0.154m/s, and the running speed of a roughing outlet mill set is 0.875m/s;

secondly, in the rolling stage of the middle rolling mill group 4: in the rolling process of the middle rolling mill group 4, the biting speed of a first middle rolling mill piece is 0.875m/s, and the running speed of a middle rolling mill outlet rolling piece is 4.432m/s;

thirdly, in the rolling stage of the pre-finishing mill group 6: the diameter of the rolled piece after rolling is 17.5mm, the biting speed of a first set of rolled pieces of pre-finish rolling is 3.487m/s, and the running speed of a pre-finish rolling outlet rolled piece is 14.32m/s in the rolling process of the pre-finish rolling unit 6;

fourth, in the finishing mill group rolling stage: the average compression ratio of pass deformation is controlled to be 1.241 in the rolling process, the diameter of a rolled piece after rolling is 7.5mm, the biting speed of a first set of finish rolling rolled piece in the rolling process of a finishing mill group is 14.32m/s, and the running speed of a pre-finish rolling outlet rolled piece is 80.68m/s;

fifthly, in the rolling stage of the reducing sizing mill: the average compression ratio of pass deformation is controlled to be 1.14 in the rolling process of the reducing mill, and the biting speed of a first reducing rolled piece is 80.68m/s in the rolling process of the reducing mill;

example 4

The process for manufacturing a bearing steel GCr15 wire rod (with a climbing section) having a diameter of 6.5mm, referring to fig. 1 to 6, differs from example 2 in that: a three-roller guide groove of a climbing section is arranged between the pre-finishing mill group 6 and the cooling recovery section 7 after pre-finishing rolling so as to clamp rolled pieces.

Example 5

The process for manufacturing a bearing steel GCr15 wire rod (with large girth discs) having a diameter of 6.5mm, with reference to fig. 1 to 6, differs from example 2 in that: a large-enclosure-disc inlet and outlet three-roller guide groove is arranged between the pre-finishing mill group 6 and the pre-finishing post-cooling recovery section 7 so as to clamp rolled pieces.

The utility model solves the problems that the hole pattern design is inflexible, the product size precision is high when the specification is fixed by rolling, but the flexibility of high-precision rolling cannot be realized when the specification is changed by setting the finishing mill group 10 and the reducing sizing mill group to be in a 1-to-2 form formed by dragging a 2-frame rolling mill by a 1-frame motor or in a 1-to-1 form formed by dragging a 1-frame rolling mill by a 1-frame motor. When the climbing or large enclosing plate is arranged behind the pre-finishing mill group 6, a three-roller type guide groove structure is adopted, so that sliding friction is reduced, and the scratch probability is reduced through rolling friction. Aiming at the surface quality scratch problem, the looper 9 is a vertical looper before finish rolling, so that the scratch caused by the contact between a rolled piece and the surface of a roller way is reduced. Aiming at small-specification wires, the first section roller way after spinning adopts a close-packed roller form, so that the problem of steel clamping from head to tail is solved. The utility model realizes the flexible high-precision production of the high-speed wire rod of the high-grade special steel, and the surface quality of the wire rod is high.

The utility model greatly improves the flexibility of the production line of the excellent special steel wire rod, improves the surface quality and the dimensional accuracy of the final product, improves the utilization rate of the rolling mill, improves the economic benefit, reduces the failure rate of equipment and improves the production stability.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.

Claims (10)

1. The utility model provides a manufacturing line of high-speed wire rod of excellent special steel, including rough rolling unit (2), rough rolling back flying shear (3), well rolling unit (4), well rolling back flying shear (5), pre-finishing mill group (6), cooling back section (7) after the pre-finishing mill, flying shear (8) before the finishing mill, loop (9) before the finishing mill, finishing mill group (10), cooling back section (11) after the finishing mill, pinch roll (17), wire laying machine (18), cooling line, collection roll collection section, its characterized in that: the finishing mill group (10) adopts a modularized form, wherein the modularized form is a 1-to-2 form formed by dragging 2 rolling mills by 1 motor or a 1-to-1 form formed by dragging 1 rolling mill by 1 motor; when the climbing section or the large surrounding plate is required to be arranged, the inlet and the outlet of the climbing section or the large surrounding plate adopt a three-roller type guide groove structure.

2. The production line for manufacturing high-speed wire rods of high-grade steel according to claim 1, wherein: and a reducing sizing unit is arranged between the finish rolling post-cooling recovery section (11) and the pinch roll (17), and comprises a reducing sizing mill set and a reducing sizing post-cooling recovery section (15) which are sequentially arranged along the rolling direction, wherein the reducing sizing mill set adopts a modularized form.

3. A production line for manufacturing high-speed wire of high-grade steel according to claim 2, characterized in that: the reducing sizing mill comprises a reducing mill (13) and a sizing mill (14) which are sequentially arranged along the rolling direction, wherein the reducing mill (13) and the finishing mill (10) are in a 1-to-2 mode, and the sizing mill (14) is in a 1-to-1 mode.

4. The production line for manufacturing high-speed wire rods of high-grade steel according to claim 1, wherein: the last 2 rolling mills of the finishing mill group (10) are in the form of 1-to-1.

5. The production line for manufacturing high-speed wire rods of high-grade steel according to claim 1, wherein: the climbing section is arranged between the pre-finishing mill group (6) and the cooling recovery section (7) after pre-finishing.

6. The production line for manufacturing high-speed wire rods of high-grade steel according to claim 1, wherein: the large enclosure plate is arranged between the pre-finishing mill group (6) and the cooling recovery section (7) after pre-finishing mill.

7. The production line for manufacturing high-speed wire rods of high-grade steel according to claim 1, wherein: the first section roller way (19) of the cooling line is a close-packed roller way, and the roller spacing of the close-packed roller way is 1 mm-8 mm.

8. A production line for manufacturing high-speed wire of high-grade steel according to claim 2, characterized in that: the front and the back of the reducing sizing unit are respectively provided with a high-speed flying shear.

9. The production line for manufacturing high-speed wire rods of high-grade steel according to claim 1, wherein: the looper (9) is a vertical looper before finish rolling.

10. The production line for manufacturing high-speed wire rods of high-grade steel according to claim 1, wherein: the tension relation between the modules is adjusted through the motor rotation speed, and the tension relation between the rolling mills in the 1-to-2 type modules is adjusted through the roll gap.