CN109396183B - Multi-line bar cutting production process - Google Patents
Multi-line bar cutting production process Download PDFInfo
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- CN109396183B CN109396183B CN201811344654.0A CN201811344654A CN109396183B CN 109396183 B CN109396183 B CN 109396183B CN 201811344654 A CN201811344654 A CN 201811344654A CN 109396183 B CN109396183 B CN 109396183B
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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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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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
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
Abstract
The invention provides a multi-line bar splitting production process method, which comprises the following steps: step A: performing multi-line segmentation on a finishing mill group; and B: cooling the plurality of cut bar steel supports through water; and C: conveying a plurality of bar steel branches subjected to water cooling to a 3# flying shear; step D: shearing the incoming steel bar; step E: conveying the sheared bar steel branches to a cooling bed for air cooling; before the plurality of bar steel branches enter the 3# flying shear, the plurality of bar steel branches are accelerated, so that the plurality of bar steel branches entering the 3# flying shear have the same speed. The invention changes the condition that the steel with multi-line segmentation is deflected after 3# flying shear segmentation, improves the walking stability, reduces the possibility that a steel head is impacted and deformed in a channel, and finally achieves the aim of avoiding the condition that the steel support flies out of the last steel after the steel support knocks into the tail of the moving apron plate to cause steel blockage.
Description
Technical Field
The invention relates to the field of steel rolling, in particular to a multi-line splitting production process method for a bar.
Background
The hot-rolled ribbed steel bar is commonly called as deformed steel bar and is widely applied to buildings, bridges, roads and other buildings. At present, deformed steel bars are produced by single-line or single-branch production, and are developed into multi-line splitting production, namely, one large deformed steel bar is split into a plurality of small deformed steel bars to be rolled on a rolling mill, the multi-line splitting production is multiple times of the single-line or single-branch production efficiency, for example, two splitting is to split one large deformed steel bar into two small deformed steel bars to be rolled, four splitting is to split one billet into four small deformed steel bars to be rolled, theoretically, the two splitting is twice of the single-line or single-branch production efficiency, and the four splitting is four times of the single-line or single-branch production efficiency.
In the multi-line cutting production, the finished steel is transversely cut into a plurality of steel branches after passing through a finishing mill, each steel branch can generally reach hundreds of meters in length, then enters a 3# flying shear cutting multiple length, is longitudinally cut into dozens of meters in length, and then enters a cooling bed. After the 3# flying shear is cut into multiple lengths, in the same channel after the shearing, some steel supports regularly walk in the channel after the shearing, and some steel supports irregularly walk and swing in the channel after the shearing (such as a second section of guide groove after the 3# flying shear or guide grooves at other parts after other 3# flying shears), which greatly affects the stability of the steel supports in the channel before the upper cooling bed, easily causes the steel supports of the skirt plate to chase after and block the steel, affects the normal running of the subsequent steel supports which come fast, thereby causing the steel in the channel before the upper cooling bed to be disordered, forming waste products and affecting the production of the whole rolling line.
In summary, the following problems exist in the prior art: when the bar is rolled for multi-line cutting, the finished steel travels and is inclined after passing through a 3# flying shear.
Disclosure of Invention
The invention provides a multi-line splitting production process method for a bar, and aims to improve the walking straightness of a steel head (the head of a steel support) after 3# is cut into multiple lengths.
Therefore, the invention provides a multi-line bar cutting production process method, which comprises the following steps:
step A: performing multi-line segmentation on the bar steel on a finishing mill group;
and B: simultaneously feeding a plurality of cut bar steel supports into a water-through cooling device for water-through cooling;
and C: conveying a plurality of bar steel branches subjected to water cooling to a 3# flying shear through a front guide groove of the 3# flying shear;
step D: shearing a plurality of bar steel branches conveyed from a front guide groove of the 3# flying shear by using the 3# flying shear;
step E: conveying the sheared bar steel branches to a cooling bed for air cooling through a guide groove after 3# flying shear;
and step C, before the plurality of bar steel branches enter the 3# flying shear, accelerating the plurality of bar steel branches to enable the plurality of bar steel branches entering the 3# flying shear to have the same speed.
Furthermore, in the step C, the speed of the plurality of steel bars entering the 3# flying shear is up to 3-18 m/s.
Furthermore, in the step C, the speed of the plurality of steel bars entering the 3# flying shear is enabled to reach 13-18 m/s.
Further, the 3# flying shear front guide groove comprises: the guide groove comprises a first section of guide groove in front of a 3# flying shear and a second section of guide groove in front of the 3# flying shear which are sequentially connected; the first section of guide groove before the 3# flying shear is close to the 3# flying shear, and the second section of guide groove before the 3# flying shear is far away from the 3# flying shear; the length of the second section of guide groove before the 3# flying shear is greater than that of the first section of guide groove before the 3# flying shear; the front first section of guide groove of the 3# flying shear is in a bell mouth shape;
the second section of guide slot before 3# flying shear includes: a rectangular main guide groove and a conical auxiliary guide groove connected with the rectangular main guide groove; the length of the rectangular main guide groove is greater than that of the conical auxiliary guide groove;
in the second section of guide groove before the 3# flying shear, a plurality of bar steel rods are accelerated.
Furthermore, in the second section of guide groove before the 3# flying shear, power is provided at the bottoms of the plurality of bar steel supports to accelerate the plurality of bar steel supports.
Furthermore, a variable-frequency supporting roller way is arranged in the rectangular main guide groove of the second section of guide groove before the 3# flying shear, so that the bottom of a plurality of bar steel supports is supported, and the plurality of bar steel supports are accelerated and conveyed.
Furthermore, the second section of guide groove before the 3# flying shear is provided with two side walls and a bottom wall arranged between the two side walls, and the second section of guide groove before the 3# flying shear is provided with a variable frequency support roller way; the frequency conversion supports the roll table and includes: inverter motor and the backup roll of connecting inverter motor, inverter motor sets up before 3# flying shear on the lateral wall of second section guide slot, is formed with the opening between two lateral walls of second section guide slot before 3# flying shear, the backup roll sets up in the opening, the diapire of second section guide slot before the parallel 3# flying shear of axis of backup roll.
Further, inverter motor's figure is two, sets up on the lateral wall of the main guide slot of rectangle, the figure of backing roll is two, is the backing roll of head end and the backing roll of tail end respectively, and the backing roll of head end is located between the backing roll of 3# flying shear and tail end, two the interval of backing roll is 1 meter, and the backing roll of head end is 1550mm to 1750mm apart from 3# flying shear shearing center, and the backing roll of head end is 450mm to 550mm apart from the leading edge of the main guide slot of rectangle.
Further, the bar is divided into four lines, and the size of the support roller is phi 180mm multiplied by 380 mm; the type of the variable frequency motor is as follows: YVP100L2-4, P ═ 2.2 KW; the transmission mode is as follows: alternating current frequency conversion and single transmission continuous forward running.
Further, the model of a motor adopted by the 3# flying shear is Z355-6C, the rated power is 355KW, the linear speed of a cutting edge of the 3# flying shear exceeds the running speed of a steel bar by 2-10%, and the turning radius is as follows: 505mm, the speed of the bar steel branch entering the conical auxiliary guide groove of the second section of guide groove before the 3# flying shear is 10-18 m/s, and the length of the bar steel branch after shearing is 84-108 m.
The invention uses the additional speed of the newly-added (variable frequency) support roller to strongly support the head of the steel branch with the cutting multiple length, so as to improve the walking linearity and stability of the steel branch after cutting. The invention changes the condition that the steel with multi-line segmentation is deflected after 3# flying shear segmentation, improves the walking stability, reduces the possibility that a steel head is impacted and deformed in a channel, and finally achieves the aim of avoiding the condition that the steel support flies out of the last steel after the steel support knocks into the tail of the moving apron plate to cause steel blockage.
Drawings
FIG. 1 is a schematic structural diagram of a No. 3 flying shear and front and rear guide grooves of the multi-line bar cutting production process method;
FIG. 2 is a schematic front view of a second guide groove section before the 3# flying shear of the present invention;
FIG. 3 is a schematic top view of the second guide slot section before the 3# flying shear of the present invention;
fig. 4 is a schematic view of the overall structure of a rolling line using the process for the multi-line slitting of bars according to the present invention.
The reference numbers illustrate:
1. a first guide groove in front of the No. 3 flying shear; 2. the second section of guide groove before the 3# flying shear; 21. a main guide groove; 22. a tapered auxiliary guide groove;
3. the direction of travel of the bar steel; 4. 3# flying shear; 25. supporting the roller way in a variable frequency manner; 251. a variable frequency motor; 252. a support roller; 253. horizontal line of the surface of the variable frequency roller; 5. a first section of guide groove after 3# flying shear; 6. a second section of guide groove after 3# flying shear; 7. a water-through cooling device; 8. a finishing mill group; 9. and (4) cooling the bed.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
1. Principle and problem analysis:
in daily production, after the 3# flying shear cuts into multiple lengths, the rolling line of the applicant often has the problems that some steel supports regularly run in the cut channel and some steel supports irregularly run and swing in the cut channel in the same cut channel.
The applicant has a great idea of this problem. Because the same blank is heated, bloomed, finish rolled and cut into 4 bar steel branches on the same rolling mill, then the bar steel branches pass through the same water-through cooling device, sequentially and simultaneously enter the first section of guide groove before the same 3# flying shear and the second section of guide groove before the same 3# flying shear, and sequentially and simultaneously enter the first section of guide groove after the same 3# flying shear and the second section of guide groove after the same 3# flying shear through the shearing of the 3# flying shear, at the moment, the problem of rear-end collision and steel disorder caused by irregular walking and swinging of some steel branches in a channel after the shearing occurs.
The applicant found that: in the process of 4 cutting, the formation and movement of 4 bar steel branches are under the same condition, however, two bar steel branches normally travel, and the other two bar steel branches do not travel in a straight line, but travel in a diagonal line or collide with a skirting board or a side board of a cut channel. For these problems, the applicant has studied for a long time and found many influencing factors, which are considered to be problems between the 3# flying shear and the post-shearing channel with rear-end collision and steel disorder, and no problems exist in other links, so that the applicant should pay attention to the upper surfaces of the first section of guide groove after the 3# flying shear and the second section of guide groove after the 3# flying shear.
Therefore, the applicant carefully checks whether the bottom wall of the first section of guide groove is manufactured uniformly and has the same friction coefficient after 3# flying shear, whether the bottom wall of the second section of guide groove is manufactured uniformly and has the same friction coefficient after 3# flying shear, whether axial eccentricity exists in 3# flying shear, whether two side walls of the first section of guide groove are different in thickness after 3# flying shear, the heat dissipation is affected, whether two side walls of the second section of guide groove are different in thickness after 3# flying shear, and whether the widths of the first section of guide groove and the second section of guide groove after 3# flying shear are insufficient. The applicant has improved all these factors and has not yet solved the problem. The applicant determines to start another stove after failure and groping of a plurality of times of investigation, and expands the investigation factors to other links from heating to 3# flying shears.
In order to solve the problem, the applicant carefully researches all links from heating to 3# flying shear, and does not find any abnormality, nor does it find or find any problem in the field. However, since this problem has long been unresolved, the applicant believes that it is certain that the apparent phenomenon masks the problem. The applicant carried out the analysis from a theoretical point of view and from a practical observation, respectively. The applicant improves the observation method, changes manual observation and common video recording into high-speed video shooting, and carries out detailed analysis on each link just like B-mode ultrasound in medicine, and finally finds that: when the bar steel branches enter the second guide groove before the 3# flying shear, the speed of one branch of 4 bar steel branches is slightly lower than that of the other two branches, the speed difference is 1-2% (about 0.13 m/s), the bar steel branches can hardly be felt by naked eyes, and no one can notice the bar steel branches, and no one can think the bar steel branches.
The applicant has continued to analyze the cause. Upon analysis of the finishing mill, the applicant found that: although theoretically the rolling reduction of the rolls on each groove is the same in the last finishing mill, in the actual rolling, the rolling reduction of each groove of 4 bars rolled by 4 bars is slightly different due to the different distances of the distribution of the 4 bars from the motor end or the bearing seat end, so that the rolling reduction of two grooves in the middle position is different from the rolling reduction of the other two grooves at the edge, and slight difference of the rolling radius is generated. Thus, in high-speed rolling of the rolling mill, it appears that in 4 branches of bar steel, the linear speed of two branches is slightly lower than that of the other two branches, especially in the later period of a roll use cycle, and the applicant found that: this difference in speed is greater than in the early part of a roll life cycle due to roll wear. After finish rolling, bar steel branches enter flying shears (in some processes, the bar steel branches enter the flying shears through a water cooling device), and enter a post-shearing channel after being sheared by the flying shears, because the shearing speed of the flying shears is generally larger than the speed of the bar steel branches by a certain proportion, the speed difference between the finished bar steel branches is enlarged, when the bar steel branches enter the post-shearing channel, the speed required by the normal straight walking of the bar steel branches in the same post-shearing channel can be kept, and the speed required by the normal straight walking of the bar steel branches is smaller than that of the bar steel branches in some processes, the friction of the channel and the taper of an inlet of the channel influence, the bar steel branches with low speed can walk in an oblique line or collide with a skirtboard or a side board of the post-shearing channel
From the above analysis, the applicant found that the reasons for this problem are comprehensive: although the problem occurs after shearing, the reason is that the problem occurs in the stage before shearing, not in the stage after shearing, and the root is that the rolling radius of each rolling groove of the finishing mill is different in the splitting rolling, the linear velocity is different, and the expanding factor is that the shearing of the flying shears further expands the velocity difference of the bar steel branch in the same channel after shearing, so that the bar steel branch with low velocity is difficult to maintain the velocity required for straight running, and the bar steel branch obliquely runs or collides with the apron plate or the side plate of the channel after shearing.
Therefore, the applicant started to improve the problem of the difference in rolling radius of the respective grooves of the finishing mill. However, the applicant has found that, whatever the improvements, there is always a difference in the rolling radius of the various grooves of the finishing mill, and the reduction of this difference is not significant. Applicants have also sought to improve the through-water cooling process. However, the water cooling process system is relatively complete in requirements, and the process parameters in the water cooling process system are difficult to greatly improve. The technical bottleneck is met.
Although the reason for the problem is found, the applicant does not have the expected effect on the improvement of the rolling mill and the water cooling technology, the applicant changes the idea, not in the source of the entanglement of the speed difference, but in the alternative, the speed of the bar steel branch with low speed is increased under the condition of the speed difference so as to reduce or eliminate the speed difference, and the bar steel branch with low speed can also obtain the speed value required by straight running. For this purpose, the applicant has identified a quick and convenient way of reducing or eliminating the speed difference of the steel strands of the bars after the finishing rolling, before entering the flying shears. Therefore, after finish rolling, the applicant enters the guide groove position before the flying shear, namely the area range of the first section of guide groove before the 3# flying shear and the second section of guide groove before the 3# flying shear, and simultaneously gives enough speed to 4 bar steel supports, the speed can increase the speed of 2 bar steel supports with low original speed, so that the 4 bar steel supports basically obtain the same speed again, and thus, no obvious speed difference exists among the 4 bar steel supports after shearing.
2. Implementation of the solution
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the multi-line cutting production process method of the bar material of the present invention comprises:
step A: performing multi-line segmentation on the bar steel on a finishing mill group;
and B: simultaneously feeding a plurality of cut bar steel supports into a water-through cooling device for water-through cooling;
and C: conveying a plurality of bar steel branches subjected to water cooling to a 3# flying shear through a front guide groove of the 3# flying shear;
step D: shearing a plurality of bar steel branches conveyed from a front guide groove of the 3# flying shear by using the 3# flying shear;
step E: conveying the sheared bar steel branches to a cooling bed for air cooling through a guide groove after 3# flying shear;
and step C, before the plurality of bar steel branches enter the 3# flying shear, accelerating the plurality of bar steel branches to enable the plurality of bar steel branches entering the 3# flying shear to have the same speed.
The production line adopted by the invention comprises: the device comprises a finishing mill group, a water cooling device, a front guide groove of a 3# flying shear, a rear guide groove of the 3# flying shear and a cooling bed which are connected in sequence; the multi-line segmentation of the bar steel support is realized on a finishing mill group; the water cooling device is of a pipeline structure with openings at two ends and is used for carrying out water cooling on a plurality of bar steel supports after cutting and rolling. So as to improve the performance of the bar; the cooling bed receives the bar steel branches sheared by the 3# flying shear, and a plurality of bar steel branches which are rolled and sheared out simultaneously are moved to a rack of the cooling bed one by the cooling bed. And (4) performing air cooling on the steel bars on the cooling bed, and bundling and packaging.
The 3# flying shear front guide groove includes: the guide groove comprises a first section of guide groove 1 in front of a No. 3 flying shear and a second section of guide groove 2 in front of the No. 3 flying shear which are sequentially connected; the length of the second section of guide groove 2 before the 3# flying shear is greater than that of the first section of guide groove 1 before the 3# flying shear; the front first section of guide groove 1 of the 3# flying shear is in a bell mouth shape; the first guide groove 1 before the 3# flying shear is close to the 3# flying shear 4, the first guide groove 1 before the 3# flying shear plays a role in gathering bar steel branches, and the bar steel branches are gathered at the 3# flying shear 4 so as to be cut; the upstream of the second section of guide groove 2 before the 3# flying shear can be sequentially connected with the guide groove, a water-through cooling device and a finishing mill group, and the bar steel support entering the second section of guide groove 2 before the 3# flying shear is subjected to finish rolling and water-through cooling treatment;
as shown in fig. 2 and 3, the second guide groove 2 before 3# flying shear includes: a rectangular main guide groove 21 and a tapered auxiliary guide groove 22 connecting the rectangular main guide groove; the sections of the rectangular main guide grooves 21 are the same along the length direction, the main transportation and guiding effects are achieved for supporting the bar steel, the conical auxiliary guide grooves 22 are in a horn mouth shape and have the gathering effect, the bar steel is gathered in the rectangular main guide grooves 21, and the outlets of the rectangular main guide grooves 21 extend into the inlets of the first section of guide grooves 1 before the 3# flying shear;
the moving direction 3 of the steel bar is the direction from the second section of guide groove before the 3# flying shear to the first section of guide groove before the 3# flying shear, and the first section of guide groove 1 before the 3# flying shear is positioned between the 3# flying shear 4 and the second section of guide groove 2 before the 3# flying shear;
in the second guide groove 2 before 3# flying shear, a plurality of steel bars are accelerated. Because the second guide groove 2 in the front of the 3# flying shear has enough acceleration space and has reasonable distance from the 3# flying shear. If the distance from the 3# flying shear is too close, the difficulty of acceleration increases, and if the distance from the 3# flying shear is too far, there are losses of speed and kinetic energy.
According to the invention, a variable-frequency support roller way is arranged in the rectangular main guide groove of the second section of guide groove 2 before the 3# flying shear, so that the bottom of a plurality of bar steel supports is supported, and the plurality of bar steel supports are accelerated and conveyed. Therefore, the condition of the steel bar can be observed at the top of the second section of guide groove 2 before the 3# flying shear, and the steel bar is convenient to clean and maintain when a fault occurs. In addition, compared with the lateral clamping conveying and the top conveying, the bottom conveying is performed, the steel rolling production characteristics are better met, the cost can be reduced, and the installation is convenient.
As shown in fig. 1, a variable frequency supporting roller way 25 is arranged on the second guide groove 2 in the front section of the 3# flying shear; as shown in fig. 2 and 3, the second guide groove before 3# flying shear has two side walls and a bottom wall disposed between the two side walls, an opening is formed between the two side walls of the second guide groove before 3# flying shear, the support roller is disposed in the opening, and the axis of the support roller is parallel to the bottom wall of the second guide groove before 3# flying shear. The frequency conversion support roller table 25 includes: the guide groove comprises a variable frequency motor 251 and a supporting roller 252 connected with the variable frequency motor, wherein the variable frequency motor 251 is arranged on the side wall of the second section of guide groove before the 3# flying shear, an opening is formed in the bottom wall of the second section of guide groove 2 before the 3# flying shear, and the supporting roller 252 is arranged in the opening; or the supporting roller way 252 is arranged in the second section of guide groove 2 before the 3# flying shear; the axis of the supporting roller 252 is parallel to the bottom wall of the second section of guide groove before the 3# flying shear, as shown in fig. 2, a horizontal line 253 of the variable frequency roller surface is the highest position of the supporting roller, is a supporting surface for supporting the steel bar, and is higher than the bottom wall of the second section of guide groove before the 3# flying shear for supporting the steel bar.
Furthermore, the supporting rollers are arranged on the side walls of the rectangular main guide groove, so that transmission and installation are facilitated.
Further, the number of the support rollers is two, namely a head end support roller and a tail end support roller, and the head end support roller is located between the 3# flying shear and the tail end support roller, so that sufficient power and sufficient support and speed supplement are shared and provided.
Furthermore, the distance between the two supporting rollers is 1 meter, so that the steel support can ensure the horizontal shearing effect and cannot collide with the flying shear arm.
Furthermore, the distance between the supporting roller at the head end and the shearing center of the 3# flying shear is 1550mm to 1750mm, so that the horizontal shearing effect can be ensured, and the supporting roller can not collide with the flying shear arm.
Further, the support roller at the head end is 450mm to 550mm from the front edge of the rectangular main guide groove (the leftmost vertical side of the main guide groove 21 in fig. 2). Therefore, the steel support has small walking fluctuation in the guide groove, and the distance between the steel support and the last variable frequency roller is about one meter, so that the roller distance is unified to play a stabilizing role in bouncing of rolled pieces.
Furthermore, a first section of guide groove 5 behind the 3# flying shear and a second section of guide groove 6 behind the 3# flying shear are sequentially connected behind the 3# flying shear, the first section of guide groove 5 behind the 3# flying shear is in a horn mouth shape, and the second section of guide groove 6 behind the 3# flying shear is identical to the second section of guide groove 2 in front of the 3# flying shear in structure. The length of the second section of guide groove 6 after the 3# flying shear is longer, and is several times or even dozens of times longer than that of the second section of guide groove 2 before the 3# flying shear, and the effect of conveying the sheared bar steel to a cooling bed is achieved. And a variable-frequency supporting roller way is also arranged in the second section of guide groove after the 3# flying shear, so that after shearing, all steel bars can move straightly at a certain speed.
Furthermore, the finishing mill group is provided with a rolling groove for four-line splitting of the steel bars, the multi-line splitting production process method for the bars is used for four-line splitting of the bars, the efficiency is 4 times that of common single-line rolling, and four steel bars are conveyed by the second guide groove before 3# flying shears. Furthermore, the speed of a plurality of steel bars entering the 3# flying shear is up to 3-18 m/s, so that the speed of the steel bars is not lower than the speed required by straight running, and cannot be too high, thus saving energy, taking the hardware capability of the 3# flying shear into consideration, and avoiding the phenomenon of steel disorder caused by too high speed. As a selection range, the speed of a plurality of bar steel branches when entering the 3# flying shear reaches 13-18 m/s, the plurality of bar steel branches smoothly run, the front and back connection of the production line is smooth, and the reasonable production speed is ensured.
The steel bar can be of two specifications of 12mm and 14mm in diameter. The rolled piece shear section and preferred operating speed are shown in table 1:
table 1: rolled piece shearing section and running speed meter
Further, the size of the supporting roller is phi 180mm multiplied by 380 mm; the type of the variable frequency motor is as follows: YVP100L2-4, P2.2 KW, to have sufficient power to support and transport four steel bars; the transmission mode is as follows: alternating current frequency conversion and single transmission continuous forward running. The linear speed of the frequency conversion supporting roller way is 13.5m/s, so that four steel bars can obtain the same speed again.
Furthermore, the model of a motor adopted by the 3# flying shear is Z355-6C, the rated power is 355KW, the linear speed of the cutting edge of the 3# flying shear exceeds the running speed of a steel bar support by 2-10%, for example, the linear speed is controlled within 2-5% of the running speed of the steel bar support, so that the expansion of the speed difference is reduced as much as possible on the premise of realizing shearing; minimum shear temperature: 550 ℃, hot tensile strength of rolled piece: 300MPa, maximum shearing force 400KN, radius of gyration: 505mm, the speed of the bar steel branch entering the conical auxiliary guide groove of the second section of guide groove before the 3# flying shear is 3-18 m/s, and the length of the bar steel branch after shearing is 84-108 m. The parameters of the 3# flying shear are matched with other parameters of the slitting rolling, so that normal shearing and normal walking of the sheared steel bar are ensured.
The invention changes the condition that the steel with multi-line segmentation is deflected after 3# flying shear segmentation, improves the walking stability, reduces the possibility that a steel head is impacted and deformed in a channel, finally achieves the aim of avoiding the condition that the steel head is blocked due to the fact that a steel support flies out of a steel support on a movable apron board and the last steel support flies behind, reduces waste products, reduces the time for processing faults, and improves the production efficiency of the whole rolling line, wherein in the early stage of the service cycle of a roller, the efficiency can be improved by more than 10%, and in the later stage of the service cycle of the roller, the fault reduction time is more, the efficiency is improved more obviously, and the efficiency can be improved by 20%.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. The multi-line bar splitting production process method is characterized by comprising the following steps:
step A: performing multi-line segmentation on the bar steel on a finishing mill group;
and B: simultaneously feeding a plurality of cut bar steel supports into a water-through cooling device for water-through cooling;
and C: conveying a plurality of bar steel branches subjected to water cooling to a 3# flying shear through a front guide groove of the 3# flying shear;
step D: shearing a plurality of bar steel branches conveyed from a front guide groove of the 3# flying shear by using the 3# flying shear;
step E: conveying the sheared bar steel branches to a cooling bed for air cooling through a guide groove after 3# flying shear;
in the step C, before the plurality of bar steel branches enter the 3# flying shear, the plurality of bar steel branches are accelerated, so that the plurality of bar steel branches entering the 3# flying shear have the same speed;
the 3# flying shear front guide groove includes: the guide groove comprises a first section of guide groove in front of a 3# flying shear and a second section of guide groove in front of the 3# flying shear which are sequentially connected; the first section of guide groove before the 3# flying shear is close to the 3# flying shear, and the second section of guide groove before the 3# flying shear is far away from the 3# flying shear; the length of the second section of guide groove before the 3# flying shear is greater than that of the first section of guide groove before the 3# flying shear; the front first section of guide groove of the 3# flying shear is in a bell mouth shape;
the second section of guide slot before 3# flying shear includes: a rectangular main guide groove and a conical auxiliary guide groove connected with the rectangular main guide groove; the length of the rectangular main guide groove is greater than that of the conical auxiliary guide groove;
accelerating a plurality of bar steel supports in a second section of guide groove before the 3# flying shear;
a variable-frequency support roller way is arranged in a rectangular main guide groove of a second section of guide groove in front of the 3# flying shear, supports are provided for the bottoms of a plurality of bar steel supports, and the plurality of bar steel supports are accelerated and conveyed;
the second section of guide groove before the 3# flying shear is provided with two side walls and a bottom wall arranged between the two side walls, and a variable frequency support roller way is arranged on the second section of guide groove before the 3# flying shear; the frequency conversion supports the roll table and includes: the variable frequency motor is arranged on the side wall of the second section of guide groove before the 3# flying shear, an opening is formed between the two side walls of the second section of guide groove before the 3# flying shear, the supporting roller is arranged in the opening, and the axis of the supporting roller is parallel to the bottom wall of the second section of guide groove before the 3# flying shear;
inverter motor's figure is two, sets up on the lateral wall of the main guide slot of rectangle, the figure of backing roll is two, is the backing roll of head end and the backing roll of tail end respectively, and the backing roll of head end is located between the backing roll of 3# flying shear and tail end, two the interval of backing roll is 1 meter, and the backing roll of head end is 1550mm to 1750mm apart from 3# flying shear shearing center, and the backing roll of head end is 450mm to 550mm apart from the leading edge of the main guide slot of rectangle.
2. The process for multi-wire cutting of bars according to claim 1, wherein in step C, the speed of the steel wire rods entering the 3# flying shear is 3-18 m/s.
3. The process for multi-wire cutting of bars according to claim 2, wherein in step C, the speed of the steel wire rods entering the 3# flying shear is 13-18 m/s.
4. The process for multi-line cutting of bar material according to claim 1, wherein the plurality of bar steel beams are accelerated by providing power to the bottom of the plurality of bar steel beams in the second guide slot before the 3# flying shear.
5. The process for multi-wire cutting bar according to claim 1, wherein the bar is multi-wire cut into four-wire cuts, and the size of the supporting roller is phi 180mm x 380 mm; the type of the variable frequency motor is as follows: YVP100L2-4, P ═ 2.2 KW; the transmission mode is as follows: alternating current frequency conversion and single transmission continuous forward running.
6. The process for multi-wire cutting bar according to claim 1, wherein the flying shear 3# adopts a motor model of Z355-6C, the rated power is 355KW, the linear speed of the cutting edge of the flying shear 3# exceeds the steel bar running speed by 2-10%, and the radius of gyration is as follows: 505mm, the speed of the bar steel branch entering the conical auxiliary guide groove of the second section of guide groove before the 3# flying shear is 3-18 m/s, and the length of the bar steel branch after shearing is 84-108 m.
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