Bar fixed-length shearing method and bar fixed-length shearing system

Abstract

The invention relates to a bar fixed-length shearing method and a bar fixed-length shearing system.The method comprises the steps that rolled pieces are sequentially placed on a steel row chain after being discharged from a cooling bed, all the rolled pieces continue to be cooled in the grouped shearing process, and after the number of the rolled pieces meets the grouped shearing number, all the rolled pieces sheared in a grouped mode are separated from the next rolled piece by a distance; the discharging trolley lifts the rolled pieces sheared in groups on the steel row chain, the temperature collecting device sequentially records the temperature values of the rolled pieces sheared in groups according to the head-to-tail sequence, the temperature values are transmitted to the control system in real time, and the control system sends out an instruction after calculation according to the temperature values. The inclination degree of a sizing baffle of the sizing machine between the first rolled piece and the last rolled piece which are sheared in groups is controlled and adjusted; and one ends of the rolled pieces sheared in groups abut against the fixed-length baffle, and the other ends of the rolled pieces sheared in groups are sheared in a flush mode. Through calculation of the temperature acquisition and control system, the fixed-length baffle of the fixed-length machine is dynamically adjusted in real time, the fixed-length shearing precision is improved, and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical rolling, and particularly relates to a method and a system for sizing and shearing bars. Background Art

[0002] Bars are widely used in industrial fields such as construction, machinery, automobiles, and ships. Some are directly used in concrete, such as deformed steel bars and plain round bars; some are processed into shafts, gears, springs, bolts, nuts, etc. through secondary processing. In recent years, with the development of industry and the progress of rolling technology, the equipment level and automatic control level of the rolling process have been continuously improved, and the competition among steel mills has become increasingly fierce. Today, when the competition is becoming white-hot, cost reduction is undoubtedly the key to improving competitiveness. For rolling enterprises, only by increasing the yield rate and reducing the cost can the products be more competitive.

[0003] In conventional bar production, the conveying roller table receives the finished rolled pieces after rolling by the rolling mill and conveys them forward. The multiple-length shear performs multiple-length segmentation. The segmented rolled pieces are continuously conveyed forward by the input roller table of the cooling bed, and after braking, they are sent into the walking rack-type cooling bed (a working surface in the metallurgical rolling industry for effectively cooling rolled products such as deformed steel bars and round bars). The rolled pieces are cooled naturally while walking on the cooling bed. Before leaving the cooling bed, the rolled pieces are conveyed to the alignment baffle by the alignment roller table to align the rolled pieces to one end in the output direction. Then, the chain conveyor forms rows of steel groups at a certain spacing and quantity, and the discharging device of the cooling bed discharges them in rows onto the output roller table of the cooling bed. The output roller table of the cooling bed conveys the rolled pieces in rows to the cold shear or saw to cut them into the specified length. The specified length of the rolled pieces is positioned by the sizing baffle on the sizing machine (a specific length of the finished steel specified by the product standard, a fixed machine for producing products according to the specified length) after shearing or sawing. The sized bars are laterally moved across the span to the lateral movement table, and then sent into the finished product span. During the transportation process, the sized bars are inspected, sorted, automatically counted, then collected into bundles by the bundling roller table and bundled, and finally sent to the collection table for weighing, hanging nameplates, and collecting the steel bundles.

[0004] To ensure the yield rate of the products, during conventional production, before the rolled pieces leave the cooling bed, the rolled pieces are conveyed to the alignment baffle by the alignment roller table of the cooling bed to align the tails of each rolled piece, and then each rolled piece leaves the cooling bed one by one. When the rolled pieces on the discharging chain meet the requirements for a set of sizing and shearing (cutting the rolled material into a certain size according to the required length), the grouped rolled pieces are moved to the output roller table of the cooling bed by the lateral movement trolley. When the grating on the output roller table of the cooling bed detects that there is steel on the roller table, the roller table is started to convey. The grouped rolled pieces are driven by the roller table and hit the sizing baffle of the sizing machine for positioning, and then the shearing machine starts to shear. The shearing length is the distance from the baffle surface to the shear blade of the shearing machine. The specified length is positioned by the sizing baffle on the sizing machine after shearing. Currently, most of the sizing machines after shearing or sawing are of the lateral movement type, such as Figure 2As shown in the figure. The sizing machine mainly consists of a column 71, a sizing cross beam 72 and a sizing trolley 73. The sizing trolley can move on the sizing cross beam to meet the requirements of different sizing. A sizing baffle is set on the sizing trolley and is driven by a hydraulic cylinder and can be opened and closed. Generally, the shearing blades of the shearing machine and the sizing baffle are parallel in the width direction, so the length of each rolled piece after shearing a group of rolled pieces is the same. However, in the actual production process, when the rolled pieces enter the cooling bed, if the temperature is relatively high, the temperature difference between the first and the last rolled pieces in a group of rolled pieces is relatively large. If sheared according to the conventional method, the lengths of the rolled pieces in a group are the same during shearing. However, due to thermal expansion and contraction (the property that objects expand when heated and contract when cooled), after the group of high-temperature rolled pieces are cooled to room temperature, the lengths of the rolled pieces will be different and cannot meet the national standard requirements of sizing shearing at the same time. As a result, there will be non-sized materials with short or long lengths in the whole bundle of rolled pieces after collection and bundling, which cannot meet the production and delivery requirements.

[0005] Therefore, based on the experience and practice of being engaged in the relevant industry for many years, the inventor of the present invention proposes a bar sizing shearing method and a bar sizing shearing system to overcome the defects of the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a bar sizing shearing method and a bar sizing shearing system, which solve the influence of temperature change on shearing accuracy. Through temperature acquisition and control system calculation, the sizing baffle of the sizing machine is adjusted in real time and dynamically to make up for the change amount of continuous cooling during the process of each rolled piece waiting for group shearing, improve the sizing shearing accuracy, and thus improve the product quality.

[0007] The purpose of the present invention is realized as follows. A bar sizing shearing method includes:

[0008] After the rolled pieces with the same initial temperature, the same initial length and flush ends enter the cooling bed, they are sequentially placed on the discharging steel chain. During the process of each rolled piece waiting for group shearing and continuing to cool, after the number of rolled pieces meets the group shearing quantity, the rolled pieces for group shearing are separated from the next rolled piece;

[0009] The rolled pieces for group shearing on the discharging steel chain are lifted. The temperature acquisition device sequentially records the temperature values of the rolled pieces for group shearing in the head-to-tail order. The temperature values are transmitted to the control system in real time. After calculation by the control system, an instruction is issued to control and adjust the inclination degree of the sizing baffle of the sizing machine between the first and the last rolled pieces for group shearing; One end of each rolled piece for group shearing is abutted against the sizing baffle, and the other end of each rolled piece for group shearing is sheared flush.

[0010] In a preferred embodiment of the present invention, the fixed-length baffle is inclined between the first rolled piece and the last rolled piece in group shearing. The inclination angle of the fixed-length baffle is in a proportional relationship with the length difference between the last rolled piece and the first rolled piece, and the length difference between the last rolled piece and the first rolled piece is in a proportional relationship with the temperature difference between the last rolled piece and the first rolled piece.

[0011] In a preferred embodiment of the present invention, the length difference between the last rolled piece and the first rolled piece is ΔL, the temperature difference between the last rolled piece and the first rolled piece is ΔT, α is the linear expansion coefficient of the rolled piece, and L is the initial length of each rolled piece when it enters the cooling bed. Then,

[0012] ΔL = α × ΔT × L.

[0013] In a preferred embodiment of the present invention, after the rolled piece is divided into multiple lengths, the rolled piece is transported forward by the action of the walking beam of the cooling bed and is cooled while being transported; when the rolled piece reaches the alignment roller table of the cooling bed, the alignment roller table of the cooling bed transports the rolled piece to the alignment side of the alignment baffle; before the rolled piece exits the cooling bed, the tail of the rolled piece impacts the alignment baffle to make the tails of each rolled piece flush.

[0014] In a preferred embodiment of the present invention, the alignment roller table includes a plurality of grooved rollers, and a plurality of roller grooves are provided on the grooved rollers; each time the walking beam of the cooling bed moves once and places the rolled piece on the alignment roller table, the rolled piece is transported forward by a set distance; the rolled piece is transported through multiple roller grooves, and when it reaches the last roller groove, the rolled piece impacts the alignment baffle to make the ends of each rolled piece flush.

[0015] In a preferred embodiment of the present invention, after the rolled pieces with aligned ends exit the cooling bed, they are sequentially placed on the discharging chain. Each time the cooling bed moves, the discharging chain moves in a small step.

[0016] In a preferred embodiment of the present invention, when the number of rolled pieces on the discharging chain meets the number for group shearing, the discharging chain moves in a large step to separate the rolled pieces in group shearing from the next rolled piece.

[0017] In a preferred embodiment of the present invention, a discharging trolley is used to lift the rolled pieces in group shearing on the discharging chain. The temperature acquisition device sequentially records the temperature values of the rolled pieces in group shearing in the head-to-tail order. The temperature values are transmitted to the control system in real time. The control system calculates according to the temperature values and issues an instruction to control the action of the fixed-length baffle of the fixed-length shearing machine in real time and adjust the inclination angle of the fixed-length baffle.

[0018] In a preferred embodiment of the present invention, a discharging trolley is used to horizontally move the rolled pieces in group shearing to the output roller table. The output roller table transports the rolled pieces in group shearing to the fixed-length shearing machine, and one end of each rolled piece in group shearing impacts and aligns with the fixed-length baffle, so that the end of each rolled piece abuts against the impact surface of the fixed-length baffle.

[0019] The object of the present invention can also be achieved in this way. A bar cut-to-length system is provided, and the bar cut-to-length system is used for the aforementioned bar cut-to-length method; the bar cut-to-length system comprises a cooling bed rack, a cooling bed alignment roller, a steel row chain, a discharge trolley and an output roller arranged in sequence along the logistics direction, an alignment baffle is provided at one end of the cooling bed alignment roller, a temperature collection device is provided at one end of the steel row chain, a cut-to-length machine and a cold shear are provided at the output end of the output roller, a cut-to-length machine is provided with a cut-to-length baffle, and an adjustment structure is connected to the cut-to-length baffle, and the adjustment structure is used to adjust the inclination angle of the cut-to-length baffle;

[0020] The bar sizing system also includes a control system, and the cooling bed rack, the cooling bed alignment roller, the steel chain, the unloading trolley, the output roller, the temperature collection device, the sizing machine and the cold shear are all electrically connected to the control system.

[0021] As described above, the bar cutting method and bar cutting system of the present invention have the following beneficial effects:

[0022] The present invention takes into account the thermal expansion and contraction of rolled pieces at different temperatures. By collecting temperature through a temperature acquisition device and performing calculations with a control system, the inclination of the cut-to-length baffle of the cut-to-length machine between the first and last rolled pieces in a group shearing process is dynamically adjusted in real time. This compensates for the variation in the amount of continuous cooling of each rolled piece while waiting for group shearing, resolves the impact of temperature changes on shearing accuracy, and improves cut-to-length shearing accuracy. By collecting the temperature of the rolled pieces on the cooling bed in real time and providing feedback to adjust the production process control, product quality is improved.

[0023] The present invention solves the problem that after shearing to a fixed length, the rolled piece becomes non-fixed-length material due to thermal expansion and contraction, and fails to meet national standards and production delivery requirements. Through the present invention, high-precision fixed-length shearing is achieved, and the product yield and product competitiveness are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0025] in:

[0026] Figure 1 : is a schematic diagram of the bar cutting system of the present invention.

[0027] Figure 2 : Schematic diagram of the fixed-length shearing device in the prior art.

[0028] In the picture:

[0029] 11. Cooling bed rack; 12. Cooling bed alignment roller; 13. Alignment baffle; 14. Steel chain; 15. Unloading trolley; 16. Output roller;

[0030] 2. Temperature acquisition device;

[0031] 3. Cold shear;

[0032] 4. Sizing machine; 41. Sizing baffle; 411. Impact surface;

[0033] 5. Control system;

[0034] 6. Rolled piece; 61. First rolled piece; 62. Last rolled piece;

[0035] 71. Column; 72. Sizing cross beam; 73. Sizing trolley. Detailed implementation manners

[0036] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0037] The detailed implementation manners of the present invention described herein are only for the purpose of explaining the objectives of the present invention and should not be construed in any way as a limitation of the present invention. Under the teaching of the present invention, those skilled in the art can conceive of any possible variations based on the present invention, and all of these should be regarded as falling within the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, they can be mechanical connections or electrical connections, or they can be the communication inside two elements. They can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific implementation manners and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] As Figure 1 shown, the present invention provides a method for sizing and shearing bars, including,

[0040] After the workpieces 6 with the same initial temperature, the same initial length and the same ends are removed from the cooling bed, they are sequentially placed on the steel chain 14. Each workpiece 6 continues to cool during the group shearing process. When the number of workpieces required for group shearing is met, each workpiece in the group shearing process is spaced apart from the next workpiece.

[0041] The unloading trolley lifts the rolled pieces 6 sheared in groups on the steel chain 14, and the temperature collecting device 2 records the temperature values of the rolled pieces 6 sheared in groups in order from the beginning to the end. The temperature values are transmitted to the control system 5 (PLC control system) in real time. The control system 5 calculates the temperature values and issues instructions to control and adjust the inclination of the fixed-length baffle 41 of the sizing machine 4 between the first rolled piece 61 and the last rolled piece 62 sheared in groups; one end of each rolled piece sheared in groups is pressed against the fixed-length baffle 41, and the other end of each rolled piece sheared in groups is sheared flush.

[0042] The present invention takes into account the thermal expansion and contraction of rolled pieces at different temperatures. By collecting temperature through a temperature acquisition device and performing calculations with a control system, the inclination of the cut-to-length baffle of the cut-to-length machine between the first and last rolled pieces in a group shearing process is dynamically adjusted in real time. This compensates for the variation in the amount of continuous cooling of each rolled piece while waiting for group shearing, resolves the impact of temperature changes on shearing accuracy, and improves cut-to-length shearing accuracy. By collecting the temperature of the rolled pieces on the cooling bed in real time and providing feedback to adjust the production process control, product quality is improved.

[0043] The present invention solves the problem that after shearing to a fixed length, the rolled piece becomes non-fixed-length material due to thermal expansion and contraction, and fails to meet national standards and production delivery requirements. Through the present invention, high-precision fixed-length shearing is achieved, and the product yield and product competitiveness are improved.

[0044] Furthermore, the sizing baffle 41 is arranged at an angle between the first workpiece 61 and the last workpiece 62 to be sheared in a group, and the inclination angle of the sizing baffle 41 is directly proportional to the length difference between the last workpiece and the first workpiece, and the length difference between the last workpiece and the first workpiece is directly proportional to the temperature difference between the last workpiece and the first workpiece.

[0045] The temperature of a rolled piece (bar) changes during cooling on a cooling bed primarily in two ways: (1) heat radiated from the surface of the rolled piece to the surrounding air; and (2) heat removed by natural convection from the air as the rolled piece moves along the cooling bed. When the rolled piece is at high temperature, convection heat loss is much smaller than radiation heat loss and can be ignored, so only radiation loss is considered.

[0046] According to the Stefan-Boltzmann law of thermal radiation, the calculation formula for the heat lost by radiation Q is:

[0047]

[0048] Considering T0<<T, we can get:

[0049]

[0050] Where: ε is the relative emissivity of the rolled piece surface; C0 is the radiation coefficient (W / (m 2 ·K 4 )); T and T0 are the temperature of the rolled piece and the ambient temperature (°K); T1 and T2 are the temperatures of the rolled piece before and after cooling (°C); F is the heat dissipation area (m 2 ); c is the specific heat capacity (J / kg·K); ρ is the density of the rolled piece (kg / m 3 ); V is the volume of the rolled piece (m 3 ); t is the passing time of the rolled piece on the cooling bed (s).

[0051] In addition to cooling on the cooling bed tooth plate (prior art), the rolled piece (bar) is also cooled during the process of grouping the discharging steel chain 14 (the number of rolled pieces meets the grouping shearing quantity). It can be seen from the above formula that under the condition of the same production process, the cooling time of the rolled piece on the cooling bed body is the same, so the temperature of the rolled piece when it gets off the cooling bed is the same. However, during the grouping process of the rolled pieces grouped by the discharging steel chain 14, the residence times of the first and the last rolled pieces (the first rolled piece 61 and the last rolled piece 62) are different, which is in a proportional relationship with the rolling output. The residence time of the first rolled piece 61 is long, and the residence time of the last rolled piece 62 is short. As a result, the temperature of the first rolled piece 61 is low and the temperature of the last rolled piece 62 is high.

[0052] An object expands when heated and contracts when cooled. The thermal expansion and contraction change amount (i.e., the length change dimension) of the rolled piece is in a proportional relationship with the temperature difference.

[0053] Set the length difference between the last rolled piece and the first rolled piece as ΔL, the temperature difference between the last rolled piece and the first rolled piece as ΔT, α as the linear expansion coefficient of the rolled piece, and L as the initial length of each rolled piece when getting off the cooling bed. Then,

[0054] ΔL = α × ΔT × L.

[0055] Before shearing, the length of the first rolled piece 61 is short and the length of the last rolled piece 62 is long. The inclination angle of the fixed-length baffle 41 is determined by the length difference ΔL between the last rolled piece and the first rolled piece and the ratio of the width dimensions of each rolled piece 6 in the grouped shearing.

[0056] Furthermore, the specific process of the bar fixed-length shearing method of the present invention is as follows:

[0057] After the rolled piece is segmented into multiple lengths (prior art), the rolled piece 6 is conveyed forward by the action of the step cooling bed rack 11 and is cooled while being conveyed; when the rolled piece 6 reaches the cooling bed alignment roller table 12, the cooling bed alignment roller table 12 transports the rolled piece to the alignment side of the alignment baffle 13; before the rolled piece 6 gets off the cooling bed, the end (tail) of the rolled piece 6 impacts the alignment baffle 13 to make the ends of each rolled piece flush.

[0058] The cooling bed alignment roller 12 generally includes a plurality of grooved rollers, on which a plurality of roller grooves are arranged; each time the cooling bed rack 11 moves, the workpiece 6 is placed on the cooling bed alignment roller 12, and the workpiece is transported forward a set distance and circulated in sequence; the workpiece 6 is transported through multiple roller grooves, and at the last roller groove, the workpiece 6 hits the alignment baffle 13 to make the ends of each workpiece flush (to achieve the goal that the tail of each workpiece is flush when the workpiece leaves the cooling bed).

[0059] After the rolled pieces with aligned ends are put down from the cooling bed, they are placed on the steel chain 14 in sequence. Every time the cooling bed moves, the steel chain 14 moves once with a small step (the small step here is relative to the subsequent large step, and the specific value of the small step is determined by the diameter of the rolled pieces, which satisfies the requirement of placing the rolled pieces on the steel chain one by one).

[0060] When the number of rolled pieces on the steel chain 14 meets the number of grouped shearing (grouped), the steel chain 14 moves with a large step (the large step here is relative to the aforementioned small step) to separate each rolled piece sheared in group (grouped rolled pieces) from the next rolled piece.

[0061] The unloading trolley 15 is used to lift the rolled pieces 6 sheared in groups on the steel chain 14. The temperature acquisition device 2 records the temperature values of the rolled pieces sheared in groups in order from beginning to end. The temperature values are transmitted to the control system in real time. The control system calculates the temperature values and issues instructions to control the movement of the length baffle 41 of the length cutting machine 4 in real time, and adjusts the inclination angle of the length baffle 41 (the calculation of this value is as mentioned above) to meet the accuracy requirements of the high-temperature rolled pieces after length shearing.

[0062] The unloading trolley 15 is used to move the group-sheared rolled pieces (group-sheared pieces) horizontally onto the output roller 16. The output roller 16 transports the group-sheared rolled pieces to the length-fixing machine 4, and one end of each group-sheared rolled piece hits the length-fixing baffle 41, so that the end of each rolled piece is aligned with the impact surface 411 of the length-fixing baffle 41. At this time, the position of the impact surface 411 has been automatically adjusted to the correct position according to the temperature change.

[0063] When one end of each rolled piece (grouped rolled piece) to be sheared in groups collides with the impact surface 411 of the fixed-length baffle 41, the cold shear 3 (or saw) performs shearing. After shearing, the length of each rolled piece will be different, but after cooling, the length of the bundled rolled pieces will be close to the same, meeting the production delivery requirements.

[0064] like Figure 1As shown, the present invention also provides a bar length shearing system, which is used for the above-mentioned bar length shearing method; the bar length shearing system includes a cooling bed rack 11, a cooling bed alignment roller 12, a steel chain 14, a discharge trolley 15 and an output roller 16 arranged in sequence along the logistics direction, an alignment baffle 13 is provided at one end of the cooling bed alignment roller 12, a temperature collection device 2 is provided at one end of the steel chain 14, a length cutter 4 and a cold shear 3 are provided at the output end of the output roller 16, a length cutter 4 is provided on the length cutter 4, and an adjustment structure is connected to the length cutter 41, and the adjustment structure is used to adjust the inclination angle of the length cutter;

[0065] The bar length shearing system also includes a control system 5, and the cooling bed rack, cooling bed alignment roller, steel chain, unloading trolley, output roller, temperature collection device, length cutting machine and cold shear are all electrically connected to the control system.

[0066] As described above, the bar cutting method and bar cutting system of the present invention have the following beneficial effects:

[0067] The present invention takes into account the thermal expansion and contraction of rolled pieces at different temperatures. By collecting temperature through a temperature acquisition device and performing calculations with a control system, the inclination of the cut-to-length baffle of the cut-to-length machine between the first and last rolled pieces in a group shearing process is dynamically adjusted in real time. This compensates for the variation in the amount of continuous cooling of each rolled piece while waiting for group shearing, resolves the impact of temperature changes on shearing accuracy, and improves cut-to-length shearing accuracy. By collecting the temperature of the rolled pieces on the cooling bed in real time and providing feedback to adjust the production process control, product quality is improved.

[0068] The present invention solves the problem that after shearing to a fixed length, the rolled piece becomes non-fixed-length material due to thermal expansion and contraction, and fails to meet national standards and production delivery requirements. Through the present invention, high-precision fixed-length shearing is achieved, and the product yield and product competitiveness are improved.

[0069] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for cutting bars to a fixed length, characterized in that, including, After the rolled pieces with the same initial temperature, the same initial length and flush ends are placed on the discharging conveyor chain in sequence after leaving the cooling bed, each rolled piece continues to cool during the waiting process for group shearing. After the number of rolled pieces meets the group shearing quantity, the rolled pieces in group shearing are separated from the next rolled piece; The discharging trolley lifts the rolled pieces in group shearing on the discharging conveyor chain, and the temperature acquisition device sequentially records the temperature values of the rolled pieces in group shearing in the head-to-tail order. The temperature values are transmitted to the control system in real time. After calculation based on the temperature values, the control system issues an instruction to control and adjust the inclination degree of the sizing baffle of the sizing machine between the first rolled piece and the last rolled piece in group shearing; One end of each rolled piece in group shearing is abutted against the sizing baffle, and the other end of each rolled piece in group shearing is sheared flush.

2. The bar sizing and shearing method according to claim 1, characterized in that, The sizing baffle is inclined between the first rolled piece and the last rolled piece in group shearing. The inclination angle of the sizing baffle is in direct proportion to the length difference between the last rolled piece and the first rolled piece, and the length difference between the last rolled piece and the first rolled piece is in direct proportion to the temperature difference between the last rolled piece and the first rolled piece.

3. The bar sizing and shearing method according to claim 2, characterized in that, The length difference between the last rolled piece and the first rolled piece is ΔL, the temperature difference between the last rolled piece and the first rolled piece is ΔT, α is the linear expansion coefficient of the rolled piece, and L is the initial length of each rolled piece when leaving the cooling bed. Then, ΔL = α × ΔT × L.

4. The bar sizing and shearing method according to claim 1, characterized in that, After the rolled pieces are segmented into multiple lengths, the rolled pieces are conveyed forward by the action of the walking beam of the cooling bed and are cooled while being conveyed; when the rolled pieces reach the alignment roller table of the cooling bed, the alignment roller table of the cooling bed transports the rolled pieces to the alignment side of the alignment baffle; before the rolled pieces leave the cooling bed, the tails of the rolled pieces impact the alignment baffle to make the tails of each rolled piece flush.

5. The bar sizing and shearing method according to claim 4, characterized in that The alignment roller table includes a plurality of grooved rollers, and a plurality of roller grooves are arranged on the grooved rollers; each time the walking beam of the cooling bed moves, the rolled piece is placed on the alignment roller table, and the rolled piece is conveyed forward by a set distance; the rolled piece is transported through multiple roller grooves, and when it is in the last roller groove, the rolled piece impacts the alignment baffle to make the ends of each rolled piece flush.

6. The bar sizing and shearing method according to claim 1, wherein After the rolled pieces with aligned ends leave the cooling bed, they are placed on the discharging conveyor chain in sequence. Each time the cooling bed moves, the discharging conveyor chain moves in a small step.

7. The method for sizing and shearing bars according to claim 6, characterized in that, When the number of rolled pieces on the discharging conveyor chain meets the group shearing quantity, the discharging conveyor chain moves in a large step to separate the rolled pieces in group shearing from the next rolled piece.

8. The bar sizing and shearing method according to claim 1, characterized in that, Use the discharging trolley to lift the rolled pieces in group shearing on the discharging conveyor chain. The temperature acquisition device sequentially records the temperature values of the rolled pieces in group shearing in the head-to-tail order. The temperature values are transmitted to the control system in real time. After calculation based on the temperature values, the control system issues an instruction to control the sizing baffle of the sizing machine in real time and adjust the inclination angle of the sizing baffle.

9. The bar sizing and shearing method according to claim 8, characterized in that, Use the discharging trolley to laterally move the rolled pieces in group shearing onto the output roller table. The output roller table conveys the rolled pieces in group shearing to the sizing machine, and one end of each rolled piece in group shearing hits the sizing baffle, so that the end of each rolled piece abuts against the impact surface of the sizing baffle for alignment.

10. A bar fixed-length shearing system, characterized in that, The bar sizing and shearing system is used for the bar sizing and shearing method according to any one of claims 1 to 9; the bar sizing and shearing system includes a cooling bed rack, a cooling bed alignment roller table, a discharging chain, a discharging trolley and an output roller table arranged in sequence along the material flow direction. An alignment baffle is arranged at one end of the cooling bed alignment roller table, a temperature acquisition device is arranged at one end of the discharging chain, a sizing machine and a cold shear are arranged at the output end of the output roller table, a sizing baffle is arranged on the sizing machine, and an adjustment structure is connected to the sizing baffle. The adjustment structure is used to adjust the inclination angle of the sizing baffle; The bar sizing and shearing system further includes a control system, and the cooling bed rack, the cooling bed alignment roller table, the discharging chain, the discharging trolley, the output roller table, the temperature acquisition device, the sizing machine and the cold shear are all electrically connected to the control system.

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