CN115608795A - Device and method for reducing shearing elbow of hot-rolled ribbed steel bar - Google Patents
Device and method for reducing shearing elbow of hot-rolled ribbed steel bar Download PDFInfo
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- CN115608795A CN115608795A CN202211295957.4A CN202211295957A CN115608795A CN 115608795 A CN115608795 A CN 115608795A CN 202211295957 A CN202211295957 A CN 202211295957A CN 115608795 A CN115608795 A CN 115608795A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
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Abstract
The invention discloses a device and a method for reducing shearing elbows of hot-rolled ribbed steel bars, wherein an end-flush baffle of the device is arranged on the side part of a conveying part on the same side of a multiple length shear; the spray header at the upper part of the side of the flush baffle is provided with a spray opening, the spray header obliquely and downwards points to the other side of the flush baffle, and the spray range extends inwards from the flush baffle. The method comprises the steps of rolling to obtain a hot-rolled ribbed steel bar, naturally cooling the steel bar on a cooling bed to the temperature of 300-400 ℃ in front of a flush baffle, spraying and cooling the end part of the steel bar to 60-120 ℃, adjusting the clearance between a ram and a copper lining plate during cold shearing, controlling the count of the cold-sheared steel bar, and shearing off the spray-cooled end of the steel bar. The steel bar end is sprayed and forcibly cooled at the position of the flush baffle before cold shearing, so that the strength of the end is improved to avoid the phenomenon of bend generation during shearing, the whole process does not need special pause cooling, the mechanical property of the end is not influenced, no water mark is left after spraying, and the steel bar end spray cooling device has the characteristics of simple structure, no influence on production, good integral appearance quality and the like.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a device and a method for reducing a shearing elbow of a hot-rolled ribbed steel bar, which are simple in structure, do not affect production, end heads of the steel bar and have good overall appearance quality.
Background
The bar production line generally adopts a stepping cooling bed to cool rolled pieces, so that the rolled pieces in a high-temperature state are gradually and naturally cooled on the rack stepping cooling bed, and the temperature of the rolled pieces before entering a cold shear (fixed length shear) for shearing is generally about 300-400 ℃. Although can generally avoid the interlude scale to cut and appear the elbow under this temperature, but the reinforcing bar head behind the bar production line cold shears (scale shears) is for can be smooth drop to the collecting box, consequently the below of cold shears (scale shears) generally sets up to cavity, thereby cause reinforcing bar head to cut first sword and get rid of because lack of the support when bad section, and there is tensile stress among the shear fracture process, and the reinforcing bar plasticity about 300 ~ 400 ℃ is higher again, the downwarping when leading to reinforcing bar end cold shears (scale shears) and inevitably produces the cold shears elbow phenomenon, seriously influence the appearance quality of reinforcing bar. Especially to the construction that generally adopts mantle fiber technology to improve engineering construction progress and quality, the reinforcing bar tip has the elbow still to need to increase the alignment processing process, not only can influence the construction progress, can cause the market competitiveness of elbow reinforcing bar to reduce in addition, can cause the reinforcing bar to scrap in batches even when serious.
In the prior art, in order to reduce the phenomenon of steel bar shearing elbow, the positioning before shearing and the stability during shearing are generally improved by controlling the moving process of the steel bar, so that the elbow phenomenon caused by tail tilting and swinging of the steel bar is reduced; meanwhile, the bend phenomenon is reduced by changing the structure and the matching of the shearing blade. However, since the plasticity of the steel bar is high at a temperature as high as 300 to 400 ℃ during shearing, burrs are generated during shearing, transverse ribs of the thread at the shearing part are crushed, and other defects are caused, and a subsequent process is required for end cutting treatment, so that the production efficiency is reduced, and the yield is influenced. Therefore, the spraying upper branch pipe is arranged above the position of the conveying roller way close to the fixed-length shearing machine, and then the spraying is carried out on the shearing part before or after the fixed-length shearing, so that the mechanical property of the steel bar is prevented from being influenced by the formation of a tempered martensite structure by the hot-rolled ribbed steel bar, and the shearing elbow of the steel bar is improved to a certain extent. However, the spray pipes are transversely arranged above the roller way, and the contact area between each reinforcing steel bar and the roller way is inconsistent due to different surface qualities of the reinforcing steel bars, so that the friction force between each reinforcing steel bar and the roller way is inconsistent, the speeds of the reinforcing steel bars in the conveying process are different, the ends of the reinforcing steel bars are difficult to align, and if only the ends are locally sprayed, the spraying lengths of the ends of the reinforcing steel bars are different, so that the end which is not subjected to spraying and cooling during subsequent shearing is bent; although the problems of the local spraying can be avoided by the extended or full-length spraying, the water stains sprayed to the steel bar retaining section are difficult to volatilize in the mutual overlapping and stacking process after shearing because the spraying is close to the fixed-length shearing machine, so that the water stains are easy to remain and rust.
Disclosure of Invention
The invention aims to provide a device for reducing the hot-rolled shearing elbow of the ribbed steel bar, which has a simple structure, does not influence the production, does not affect the end of the steel bar, has better overall appearance quality, and also provides a method for reducing the hot-rolled shearing elbow of the ribbed steel bar.
The device for reducing the shearing elbow of the hot-rolled ribbed steel bar is realized by the following steps: the device comprises a conveying mechanism and a flush baffle, wherein a conveying part of the conveying mechanism is arranged at the top of a cooling bed along the conveying direction of the hot-rolled ribbed steel bars, and the flush baffle is arranged at the side part of the conveying part at the same side with the double-length shears; the spray head is arranged on the upper portion of the side of the flush baffle, one end of the spray head is communicated with the liquid supply system, a spray opening is formed in the other end of the spray head, the spray opening of the spray head is obliquely and downwards directed to the other side of the flush baffle, and the spray range extends for a certain distance from the flush baffle to the middle of the conveying component.
The method for reducing the shearing elbow of the hot-rolled ribbed steel bar is realized by the following steps: the method comprises the following steps:
A. heating and rolling a billet to obtain a hot-rolled ribbed steel bar;
B. naturally cooling the hot-rolled ribbed steel bar on a cooling bed to reduce the surface temperature of the flush baffle plate of the device for reducing the shearing elbow of the hot-rolled ribbed steel bar to 300-400 ℃;
C. starting a spray header to spray cooling liquid on a sheared part on the end of the hot-rolled ribbed steel bar at the flush baffle, and cooling the sheared part of the end of the hot-rolled ribbed steel bar to 60-120 ℃;
D. adjusting the clearance between a ram and a copper lining plate during cold shearing, and controlling the number of hot-rolled ribbed steel bars during cold shearing by taking non-overlapping cold shearing as a target;
E. and D, operating a cold shearing machine to shear off the end of the hot-rolled ribbed steel bar subjected to spray cooling in the step C.
The invention has the beneficial effects that:
1. the steel bar end with the surface temperature of 300-400 ℃ is sprayed and forcibly cooled at the position of the end-flush baffle before cold shearing, so that the steel bar is prevented from forming a tempered martensite structure to influence the mechanical property of the steel bar, the lower end temperature can also improve the strength of the steel bar to prevent the steel bar from being sheared to generate an elbow phenomenon and prevent a thread transverse rib at a shearing part from being flattened, and the generation of burrs can also be effectively reduced by matching with a proper ram and a copper lining plate gap, so that the subsequent end-flush treatment is not needed, and the end quality and the yield of the steel bar can also be improved; and the spray header arranged at the upper part of the side of the flush baffle plate does not influence the continuous movement of the reinforcing steel bars on the cooling bed, so that the whole process does not need special pause cooling, the existing production does not need to be changed, and the production efficiency is not influenced.
2. The spray forced cooling only sprays one end of a steel bar with a multiple length, and the forced spray cooling is carried out at the position of the flush baffle, the flush baffle can align the steel bar during spraying, so the spray range can be accurately controlled according to the length of the sheared end, and the spray header is arranged on the cooling bed, so that water stains sprayed on the steel bar can be fully volatilized before shearing, the sheared steel bar has no water mark residue, the rusting problem caused by the water mark residue is avoided, and the appearance quality of the steel is improved.
3. The spray forced cooling only sprays one end of a multiple-length reinforcing steel bar, so that the consumption of cooling liquid is less, the requirement of a matched liquid supply system can be reduced, the collection and treatment pressure of later-stage cooling waste liquid can be reduced, the matched cost and the use cost can be reduced, and the environmental pollution can be reduced and even avoided.
4. The shearing device is used for shearing phi 12-22 mm varieties of HRB400E hot-rolled ribbed steel bars, the elbow phenomenon disappears, the metallographic structure of the end part of steel is unchanged compared with that before spraying through metallographic structure inspection, the national standard requirements are met, the bending problem of cold shearing in the HRB400E production process is effectively solved, and the occurrence of complaints and dissatisfaction events of users is avoided.
In conclusion, the invention has the characteristics of simple structure, no influence on production, steel bar ends and better overall appearance quality.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a second structural diagram of the present invention;
FIG. 3 is a cross-sectional view of FIG. 2 rotated 180;
in the figure: 1-conveying part, 2-flush baffle, 3-spray header, 4-spray pipe, 5-spray nozzle, 6-control valve, 7-liquid collecting hopper and 8-hot rolling ribbed steel bar.
Detailed Description
The invention is further described with reference to the following figures and examples, but the invention is not limited in any way and any variations or modifications based on the teachings of the invention are within the scope of the invention.
As shown in fig. 1 to 3, the device for reducing the shear bend of the hot-rolled ribbed steel bar of the invention comprises a conveying mechanism and a flush baffle 2, wherein a conveying part 1 of the conveying mechanism is arranged at the top of a cooling bed along the conveying direction of the hot-rolled ribbed steel bar, and the flush baffle 2 is arranged at the side part of the conveying part 1 on the same side with the double-length shear; the automatic flushing device is characterized by further comprising a spray head 3 arranged on the upper portion of the side of the flush baffle 2, one end of the spray head 3 is communicated with the liquid supply system, a spray opening is formed in the other end of the spray head 3, the spray opening of the spray head 3 inclines downwards to the other side of the flush baffle 2, and the spray range extends for a certain distance from the flush baffle 2 to the middle of the conveying part 1.
The spray heads 3 are respectively arranged at the upper parts of the two ends of the flush baffle 2, and the spray nozzles 3 at the two ends of the flush baffle 2 are respectively inclined downwards and point to one side of the other side.
The upper part of the flush head baffle 2 is also provided with a spray pipe 4 extending along the conveying direction of the conveying part 1, the spray pipe 4 is communicated with the liquid supply system, a plurality of nozzles 5 are arranged at intervals on the lower surface of the spray pipe 4, and the spray range of the nozzles 5 on the spray pipe 4 is consistent with that of the spray heads 3.
And control valves 6 capable of controlling on-off are respectively arranged between the spray header 3 and the liquid supply system and between the spray pipe 4 and the liquid supply system.
The water pressure of the spray header 3 is 0.4-0.8 MPa, the water temperature is less than or equal to 30 ℃, and the spray range of the spray header 3 is 30-50 mm from the flush head baffle 2 to the inner side of the conveying component 1.
The flushing baffle 2 is provided with a liquid collecting hopper 7 with an upward opening below the conveying part 1, the opening of the liquid collecting hopper 7 is not smaller than the projection of the spraying range of the spraying head 3 below the conveying part 1, and the bottom of the liquid collecting hopper 7 is provided with a liquid discharge pipe.
The conveying mechanism is a stepping rack conveying mechanism, and the conveying part 1 is a rack plate.
The control valve 6 is a manual control valve or an electromagnetic control valve.
The method for reducing the shearing elbow of the hot-rolled ribbed steel bar comprises the following steps:
A. heating and rolling a billet to obtain a hot-rolled ribbed steel bar;
B. naturally cooling the hot-rolled ribbed steel bar on a cooling bed to reduce the surface temperature of the flush baffle plate of the device for reducing the shearing elbow of the hot-rolled ribbed steel bar to 300-400 ℃;
C. opening a spray header to spray cooling liquid on a sheared part on the end of the hot-rolled ribbed steel bar at the flush baffle, and cooling the sheared part of the end of the hot-rolled ribbed steel bar to 60-120 ℃;
D. adjusting the clearance between a ram and a copper lining plate during cold shearing, and controlling the number of hot-rolled ribbed steel bars during cold shearing by taking non-overlapping cold shearing as a target;
E. and C, operating a cold shearing machine to shear off the end of the hot-rolled ribbed steel bar subjected to spray cooling in the step C.
The specification of the hot-rolled ribbed steel bar in the step A is phi 12-22 mm, and the temperature of a cooling bed on the hot-rolled ribbed steel bar in the step B is 850-890 ℃.
And in the step C, the water pressure of the cooling liquid is 0.4-0.8 MPa, the water temperature is less than or equal to 30 ℃, and the spraying length of the end part of the hot-rolled ribbed steel bar is 30-50 mm.
In the step B, the surface temperature of the hot-rolled ribbed steel bar before the flush baffle is higher than 400 ℃ and forced cooling is carried out to easily generate a tempered martensite structure, so that the final mechanical property of the finished steel bar is influenced; and the temperature lower than 300 ℃ causes the cooling time of the steel bars on the cooling bed to be too long, thereby affecting the production efficiency.
And D, adjusting the clearance between the ram and the copper lining plate to 0.15-0.25 mm.
And D, according to the specification of the roller way, paying out the roller way according to the non-overlapping cold shear as a target.
Example 1: and cutting HRB400E hot-rolled ribbed steel bars to a fixed length by phi 14mm.
S100, heating and rolling the 165 square billet to obtain a hot-rolled ribbed steel bar with the diameter of 14mm, and feeding the rolled steel bar to a cooling bed at the temperature of 870 ℃.
S200, naturally cooling the hot-rolled ribbed steel bar on a stepping cooling bed, and controlling the step speed to reduce the surface temperature of the position reaching the flush baffle 2 to 360 ℃.
S300, according to the length of the pre-cut end, adjusting the spraying range of the spray header 3 to control the length of the sprayed steel bar end to be 35mm, then opening one spray header 3 on the side of the flush baffle 2, spraying cooling liquid with the water pressure of 0.6MPa and the water temperature of 26 ℃ onto the shearing part of the steel bar end at the position of the flush baffle 2, and reducing the temperature of the shearing part of the steel bar end with the diameter of 14mm to 100 ℃.
S400, adjusting the clearance between the ram and the copper lining plate to 0.20mm during cold shearing; meanwhile, according to the specification of the roller way, the shearing number of the phi 14mm steel bars is controlled to be 88, and the steel bars are not allowed to have overlapping cold shearing.
S500, operating a material pressing device of a cold shearing machine (fixed length shear) to press downwards, moving an upper shear blade downwards to shear off the end of the reinforcing steel bar with the diameter of 14mm, and cooling the end with the length of 35mm by spraying.
S600, repeating the steps from S100 to S500, and finishing the production of the qualified product of the hot-rolled ribbed steel bar with the phi 14mm specification and any fixed length.
The steel bar with the diameter of 14mm has no elbow phenomenon after being sheared, the metallographic structure at the end part of the steel has no obvious difference with that before being sprayed after being detected, and the problem of rusting caused by water stain does not occur after being sheared.
Example 2: and cutting HRB400E hot-rolled ribbed steel bars to a fixed length by phi 22mm.
S100, heating and rolling 180 square billets to obtain hot-rolled ribbed steel bars with the diameter of 22mm, and feeding the rolled ribbed steel bars to a cooling bed at the temperature of 890 ℃.
S200, naturally cooling the hot-rolled ribbed steel bar on a stepping cooling bed, and controlling the step speed to reduce the surface temperature of the position reaching the flush baffle 2 to 395 ℃.
S300, adjusting the spraying range of the spray header 3 according to the length of the pre-cut end to control the length of the sprayed steel bar end to be 50mm, then opening the spray headers 3 at the two sides of the flush baffle 2 and the spray pipes 4 at the top end, and spraying cooling liquid with the water pressure of 0.8MPa and the water temperature of 24 ℃ onto the shearing part of the steel bar end at the flush baffle 2 to reduce the temperature of the shearing part of the steel bar end with the diameter of 22mm to 80 ℃.
S400, adjusting the clearance between the ram and the copper lining plate to 0.28mm during cold shearing; meanwhile, according to the specification of the roller way, the shearing number of the phi 22mm steel bars is controlled to be 48, and the steel bars are not allowed to have overlapping cold shearing.
S500, operating a material pressing device of a cold shearing machine (fixed length shear) to press downwards, moving an upper shear blade downwards to shear off the end of the reinforcing steel bar with the diameter of 22mm, and spraying and cooling the end with the length of 50mm.
S600, repeating the steps from S100 to S500, and finishing the production of the qualified product of the hot-rolled ribbed steel bar with the phi 22mm specification and any fixed length.
The steel bar with the diameter of 22mm has no elbow phenomenon after being sheared, the metallographic structure at the end part of the steel has no obvious difference with that before being sprayed after being detected, and the problem of rusting caused by water stain does not occur after being sheared.
Claims (10)
1. A device for reducing a shearing elbow of a hot-rolled ribbed steel bar comprises a conveying mechanism and a flush baffle (2), wherein a conveying part (1) of the conveying mechanism is arranged at the top of a cooling bed along the conveying direction of the hot-rolled ribbed steel bar, and the flush baffle (2) is arranged at the side part of the conveying part (1) on the same side as a double-length shear; the device is characterized by further comprising a spray head (3) arranged on the upper portion of the side of the flush head baffle (2), one end of the spray head (3) is communicated with the liquid supply system, a spray opening is formed in the other end of the spray head (3), the spray opening of the spray head (3) is inclined downwards and points to the other side of the flush head baffle (2), and the spray range extends for a certain distance from the flush head baffle (2) to the middle of the conveying part (1).
2. The device for reducing the shearing elbow of the hot-rolled ribbed steel bar as claimed in claim 1, wherein the side upper parts of the two ends of the flush baffle (2) are respectively provided with a spray header (3), and the spray headers (3) at the two ends of the flush baffle (2) respectively point to the opposite side in a downward inclined mode.
3. The device for reducing the shearing elbow of the hot-rolled ribbed steel bars as claimed in claim 1, wherein the upper part of the flush head baffle (2) is further provided with a spray pipe (4) extending along the conveying direction of the conveying part (1), the spray pipe (4) is communicated with a liquid supply system, a plurality of spray nozzles (5) are arranged on the lower surface of the spray pipe at intervals, and the spray range of the spray nozzles (5) on the spray pipe (4) is consistent with that of the spray head (3).
4. The device for reducing the shear bends of the hot-rolled ribbed steel bars as claimed in claim 3, wherein control valves (6) capable of controlling on-off are respectively arranged between the spray headers (3) and the spray pipes (4) and the liquid supply system.
5. The apparatus for reducing shear bends of hot rolled ribbed steel bars according to any one of claims 1 to 4, characterized in that the water pressure of the spray headers (3) is 0.4 to 0.8MPa and the water temperature is less than or equal to 30 ℃, and the spray range of the spray headers (3) is 30 to 50mm from the flush baffles (2) to the inner side of the conveying part (1).
6. The device for reducing the shearing elbow of the hot-rolled ribbed steel bar as claimed in claim 5, wherein the flush head baffle (2) is provided with a liquid collecting hopper (7) with an upward opening below the conveying component (1), the opening of the liquid collecting hopper (7) is not smaller than the projection of the spraying range of the spraying head (3) below the conveying component (1), and the bottom of the liquid collecting hopper (7) is provided with a liquid discharging pipe.
7. A method for reducing shearing elbow of hot-rolled ribbed steel bar is characterized by comprising the following steps:
A. heating and rolling a billet to obtain a hot-rolled ribbed steel bar;
B. naturally cooling the hot-rolled ribbed steel bar on a cooling bed to reduce the surface temperature of the flush baffle plate of the device for reducing the shear elbow of the hot-rolled ribbed steel bar, which is disclosed by any one of claims 1 to 6, to 300-400 ℃;
C. starting a spray header to spray cooling liquid on a sheared part on the end of the hot-rolled ribbed steel bar at the flush baffle, and cooling the sheared part of the end of the hot-rolled ribbed steel bar to 60-120 ℃;
D. adjusting the clearance between a ram and a copper lining plate during cold shearing, and controlling the number of hot-rolled ribbed steel bars during cold shearing by taking non-overlapping cold shearing as a target;
E. and C, operating a cold shearing machine to shear off the end of the hot-rolled ribbed steel bar subjected to spray cooling in the step C.
8. The method of replacing a roll collar of a rolling mill according to claim 7, wherein the hot rolled ribbed steel bar in the step A has a gauge of 12 to 22mm, and the temperature of the cooling bed on the hot rolled ribbed steel bar in the step B is 850 to 890 ℃.
9. The method for replacing a roll collar of a rolling mill according to claim 7, wherein in the step C, the water pressure of the cooling liquid is 0.4 to 0.8MPa, the water temperature is less than or equal to 30 ℃, and the spraying length of the end part of the hot-rolled ribbed steel bar is 30 to 50mm.
10. The method for replacing a roll collar of a rolling mill according to claim 7, 8 or 9, wherein in the step D, the clearance between the ram and the copper liner plate is adjusted to 0.15 to 0.25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211295957.4A CN115608795A (en) | 2022-10-21 | 2022-10-21 | Device and method for reducing shearing elbow of hot-rolled ribbed steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211295957.4A CN115608795A (en) | 2022-10-21 | 2022-10-21 | Device and method for reducing shearing elbow of hot-rolled ribbed steel bar |
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| Publication Number | Publication Date |
|---|---|
| CN115608795A true CN115608795A (en) | 2023-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211295957.4A Pending CN115608795A (en) | 2022-10-21 | 2022-10-21 | Device and method for reducing shearing elbow of hot-rolled ribbed steel bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115608795A (en) |
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2022
- 2022-10-21 CN CN202211295957.4A patent/CN115608795A/en active Pending
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