A wire anti-scuffing control method for wire with diameter greater than 12 mm
By sorting production according to specifications and materials, and controlling the steel parts and rolling parameters, quality problems such as scratches in high-speed wire rod production have been solved, and efficient and stable wire rod production has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SGIS SONGSHAN CO LTD
- Filing Date
- 2023-11-29
- Publication Date
- 2026-07-03
AI Technical Summary
In the production of high-speed industrial wire rods, steel grades such as HC1T and 1215 with a specification of >Φ12mm are prone to quality problems such as scratches, folds and wire drawing during the rolling process, and it is difficult to locate the point of occurrence, resulting in unstable quality of finished products.
Production is carried out in order of specifications and materials, and the size of the steel passing parts and rolling parameters after the sizing and reducing unit are strictly controlled. This includes using a uniform steel passing part model, adjusting the lead rate and blowing time of the wire spinning machine, ensuring the alignment of the rolling center line, prohibiting full clamping function, and using lubrication measures.
It effectively reduced the defect rate of finished products, improved production stability and efficiency, ensured that the scratch depth on the wire surface was ≤0.02mm, and improved production efficiency.
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-strength wire production technology, and more specifically, to a method for preventing abrasion control of wires with a diameter >12mm. Background Technology
[0002] During high-speed industrial wire rod production and rolling, the product quality requirements are far higher than those for conventional steel grades, making the red-hot steel highly susceptible to scratches, resulting in quality problems such as scratches, folds, and wire breakage. Due to the special nature of wire rod rolling lines, which are typically over 800 meters long, there are numerous potential sources of scratches, folds, and wire breakage, making it difficult to pinpoint the exact location of these issues. This is especially true when producing steel grades such as HC1T and 1215 with a diameter greater than 12mm. Longitudinal scratches appear on the surface along the wire rod direction, with depths ranging from 0.07 to 0.15mm and widths from 0.04 to 0.1mm. The location of these scratches is not fixed; they can occur at the beginning, middle, and end of the entire wire rod, and even throughout the entire rod.
[0003] Therefore, this invention is proposed. Summary of the Invention
[0004] The purpose of this invention is to overcome the defects of the prior art and provide a method for preventing abrasion of wires with a diameter greater than 12mm.
[0005] The technical problem solved by this invention is achieved by the following technical solution.
[0006] This invention provides a method for preventing scratches on wire rods with diameters greater than 12mm, which includes: producing wire rods in order of size from large to small, strictly controlling the dimensions of the steel parts after the sizing mill, and using different rolling parameters for wire rods of different steel grades and specifications.
[0007] The present invention has the following beneficial effects:
[0008] This invention provides a method for preventing abrasion of wire rod with diameter >12mm. By controlling the selection requirements of steel parts after the sizing mill and the rolling parameters, this invention reduces the defect rate of finished products, ensures smooth and stable production, and improves production efficiency. Detailed Implementation
[0009] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.
[0010] The following is a detailed description of a method for preventing abrasion of wires with a diameter greater than 12mm, provided by an embodiment of the present invention.
[0011] This invention provides a method for preventing abrasion of wires with a diameter greater than 12mm, comprising the following steps:
[0012] The wire rod production line includes the TMB mill, the first heat-conducting groove, the No. 11 water tank, the second heat-conducting groove, the No. 12 water tank, the G5 pinch roll, the No. 8 flying shear, the G6 pinch roll, the front bending pipe of the wire drawing machine, and the wire drawing machine, arranged sequentially along the rolling direction.
[0013] To reduce surface scratches on finished products (scratch depth controlled to ≤0.02mm), production scheduling is based on Φ12mm as the boundary. Steels larger than Φ12mm are scheduled in descending order of size. Steels of the same specification are loaded into the furnace in the order of softest to hardest material, but free-cutting steels of each specification are arranged last.
[0014] The control requirements are as follows:
[0015] Selection requirements for steel-passing components after the sizing and reducing mill:
[0016] The first and second heat-spreading channels, water-cooled components, G5# pinch roller inlet and outlet guides, and 8# flying shear steel pipe all use Φ32mm.
[0017] 8# flying shear self-made guide groove (sliding changes rolling), 8# flying shear outlet guide tube uses 32mm;
[0018] The G6# pinch roller inlet guide and roller ring are installed according to the corresponding specification selection standard.
[0019] The original process involved selecting Φ32mm for the first and second heat-spreading channels and water-cooling components, and Φ20mm or Φ25mm for the inlet and outlet guides of the G5# pinch roller and the 8# flying shear steel pipe. The steel passage was reduced in size, which could easily cause scratches. The solution provided by this invention, after improvement, standardizes the steel passage to Φ32mm, thus avoiding scratches caused by the reduced passage size.
[0020] Positioning requirements for the guide rollers of the front bending tube of the spinning mill: the inner arc surface of the exit side roller should be 27±0.5mm from the lower inner wall of the bending tube, and the inner arc surface of the middle roller should be about 1.5mm lower than the upper inner wall of the bending tube. The rolling center line of the front bending tube of the spinning mill should be as coincident as possible with the center line of the straight tube of the spinning mill. The finishing mill operator must carefully confirm this during installation. The centering adjustment can be made by adding a furnace number plate as a shim at the installation position.
[0021] The original process involved the inner arc surface of the roller at the exit side of the spinning mill being 25±0.5mm from the lower inner wall of the bend, while the inner arc surface of the middle roller was approximately 1mm lower than the upper inner wall of the bend. This resulted in the rolling center line of the front bend of the spinning mill not being on the same horizontal line as the center line of the straight pipe of the spinning mill, causing scratches on the rolled parts. The solution provided by this invention, after improvement, ensures that the rolling center line of the front bend of the spinning mill is essentially aligned with the center line of the straight pipe of the spinning mill, reducing scratches.
[0022] The inlet short guide tube of the spinning machine should be of 34mm inner diameter and should not have abnormal wear; the inner diameter of the inner ring of the straight tube of the spinning machine should be 34mm ± 0.3mm.
[0023] The material of the spiral tube installed on the spinning disc must be T91, with an inner diameter of Φ40mm. The spiral tube is ground and polished offline by steel wire rope and inspected with an endoscope to ensure there are no burrs, slag, pits, or protrusions. After the spinning disc is installed on the line, the guide plate area must be inspected again to ensure it is smooth.
[0024] All steel parts must be ground smooth before being put on the line, and there should be no sharp edges or corners at the contact points with the rolled parts. They must be tested by bare hand and found to be free of burrs. The inspection must be carried out by a designated person and confirmed by the work shift manager.
[0025] Rolling parameter control requirements:
[0026] The full clamping function of the G6# pinch roller in front of the spinning machine is prohibited from being put into use;
[0027] For the first two rolls of new specifications or new steel grades, the lead rate of the wire drawing machine is set between -3.0% and -1.0%. In the original process, the lead rate of the wire drawing machine was set between +1% and +3%, which resulted in: if the lead rate was too high, the ring shape was small and the inner ring was easily scratched; if the lead rate was too low, the ring shape was large and the outer ring was easily scratched.
[0028] During the rolling of non-hard wire steel, the lead rate of the wire feeder is controlled between -2.0% and 1.0%.
[0029] During the rolling of hard wire steel (currently mainly for SCM435, ML40Cr, 8620, 50BV30, and 55SiCr, with the possibility of adding more later), the main operator must adjust the lead rate of the wire spinneret every 10-15 steel rolls, with each adjustment being 0.5%, and the adjustment range being between -2.5% and 1.5%. During the adjustment of the lead rate of the wire spinneret, the wire spinneret support plate must be used simultaneously to ensure that the ring shape is kept in the center of the air-cooled roller table.
[0030] The lead rate of the G6# pinch roller in front of the spinning machine is controlled between 0.5% and 1.0%.
[0031] When each specification is about to be rolled out, the main operator needs to notify the finishing mill personnel to turn off the cooling water in the pre-bend pipe before the last steel is rolled.
[0032] During each specification change, the inner wall of the spinning spiral tube must be inspected with an endoscope. The cooling passage must be purged before inspection, and care should be taken to avoid damaging the endoscope.
[0033] The standard rolling speed for finished products is set as follows: Φ20mm: 18m / s; Φ19mm: 18m / s; Φ18mm: 18m / s; Φ17mm: 22m / s; Φ16mm: 27m / s; Φ15mm: 30m / s; Φ14mm: 35m / s; Φ13mm: 40m / s.
[0034] The inlet of the spinning machine must be properly equipped with a compressed air pipe to prevent cooling water from the bend guide roller from flowing into the straight or spiral pipe of the spinning machine. An oil-air pipe should be installed at the inlet of the spinning tube to lubricate it. The compressed air purging time for the spinning tube should be set to 20-35 seconds, stopping after each steel bar has passed through. When rolling 20 to 18 mm gauges, the purging time should be set to 35 seconds per steel bar; when rolling 17 to 15 mm gauges, the purging time should be set to 30 seconds per steel bar; and when rolling 14 to 13 mm gauges, the purging time should be set to 20 seconds per steel bar.
[0035] The compressed air purging time for the wire spinneret should be set to 20-35 seconds, and purging must be stopped only after each steel piece has passed through. Since the compressed air is mainly used to remove impurities, this 20-35 seconds should be allowed at the tail end of the rolled piece to prevent impurities from scratching it before purging is stopped.
[0036] The features and performance of the present invention will be further described in detail below with reference to embodiments.
[0037] Example
[0038] A method for preventing abrasion control of wires with a diameter greater than 12mm includes the following steps:
[0039] The wire rod production line consists of the following components arranged sequentially along the rolling direction: TMB mill - first soaking tubing - No. 11 water tank - second soaking tubing - No. 12 water tank - G5 pinch roll - No. 8 flying shear - G6 pinch roll - wire drawing machine front bending pipe - wire drawing machine. To minimize surface scratches on the finished product (scratch depth controlled to ≤0.02mm), production scheduling is based on a Φ12mm diameter. Steels larger than Φ12mm are scheduled in descending order of size. For steel grades of the same specification, the furnace is loaded in order of softness followed by hardness, but free-cutting steels of each specification are arranged last.
[0040] Control requirements:
[0041] I. Selection requirements for steel-passing components after the sizing and reducing unit:
[0042] The first and second heat-spreading channels, water-cooled components, G5# pinch roller inlet and outlet guides, and 8# flying shear steel pipe all use Φ32mm.
[0043] 8# flying shear self-made guide groove (sliding changes rolling), 8# flying shear outlet guide tube uses 32mm;
[0044] The G6# pinch roller inlet guide and roller ring are installed according to the corresponding specification selection standard.
[0045] Positioning requirements for the guide rollers of the front bending tube of the spinning mill: the inner arc surface of the exit side roller should be 27±0.5mm from the lower inner wall of the bending tube, the inner arc surface of the middle roller should be about 1.5mm lower than the upper inner wall of the bending tube, and the rolling center line of the bending tube should be as coincident as possible with the center line of the straight tube of the spinning mill. The finishing mill operator must carefully confirm this during installation. Centering can be adjusted by adding a furnace number plate as a shim at the installation position.
[0046] The inlet short guide tube of the spinning machine should be of 34mm inner diameter and should not have abnormal wear; the inner diameter of the inner ring of the straight tube of the spinning machine should be 34mm ± 0.3mm.
[0047] The material of the spiral tube installed on the spinning disc must be T91, with an inner diameter of Φ40mm. The spiral tube is ground and polished offline by steel wire rope and inspected with an endoscope to ensure there are no burrs, slag, pits, or protrusions. After the spinning disc is installed on the line, the guide plate area must be inspected again to ensure it is smooth.
[0048] All steel parts must be ground smooth before being put on the line, and there should be no sharp edges or corners at the contact points with the rolled parts. They must be tested by bare hand and found to be free of burrs. The inspection must be carried out by a designated person and confirmed by the work shift manager.
[0049] II. Rolling Parameter Control Requirements:
[0050] The full clamping function of the G6# pinch roller in front of the spinning machine is prohibited from being put into use;
[0051] For the first two rolls of new specifications or new steel grades, the lead rate of the wire drawing machine should be set between -3.0% and -1.0%.
[0052] During the rolling of non-hard wire steel, the lead rate of the wire feeder is controlled between -2.0% and 1.0%.
[0053] During the rolling of hard wire steel (currently mainly for SCM435, ML40Cr, 8620, 50BV30, and 55SiCr, with the possibility of adding more later), the main operator must adjust the lead rate of the wire spinneret once every 10 steel rolls, with each adjustment being 0.5%, and the adjustment range being between -2.5% and 1.5%. During the adjustment of the lead rate of the wire spinneret, the wire spinneret support plate must be used simultaneously to ensure that the ring shape is kept in the center of the air-cooled roller table.
[0054] The lead rate of the G6# pinch roller in front of the spinning machine is controlled between 0.5% and 1.0%.
[0055] For each steel grade and specification in each shift, key rolling parameters must be recorded (at least once), including the advance rate of the G6# pinch roll before the wire spinneret, the advance rate of the wire spinneret, the speed correction coefficient of the wire spinneret, the ovality of the finished product, the actual elongation value between TMB1 and TMB2, and the scratch condition of the finished product.
[0056] When each specification is about to be rolled out, the main operator must notify the finishing mill personnel to turn off the cooling water in the bending pipe of the wire drawing machine for the last steel.
[0057] During each specification change, the inner wall of the spinning spiral tube must be inspected with an endoscope. The cooling passage must be purged before inspection, and care should be taken to avoid damaging the endoscope.
[0058] The standard rolling speed for finished products is set as follows: Φ20mm: 18m / s; Φ19mm: 18m / s; Φ18mm: 18m / s; Φ17mm: 22m / s; Φ16mm: 27m / s; Φ15mm: 30m / s; Φ14mm: 35m / s; Φ13mm: 40m / s.
[0059] The inlet of the spinning machine must be properly equipped with a compressed air pipe to prevent cooling water from the bend guide roller from flowing into the straight or spiral pipe of the spinning machine. An oil-air pipe should be installed at the inlet of the spinning tube to lubricate it. The compressed air purging time for the spinning tube should be set to 20-35 seconds, stopping after each steel bar has passed through. When rolling 20 to 18 mm gauges, the purging time should be set to 35 seconds per steel bar; when rolling 17 to 15 mm gauges, the purging time should be set to 30 seconds per steel bar; and when rolling 14 to 13 mm gauges, the purging time should be set to 20 seconds per steel bar.
[0060] Using the above process, the results of large-size rolling scratches in February 2023 are summarized as follows:
[0061] After two or three months of exploration and summarization, the overall situation of large-scale scratches in this production is under control.
[0062] Production is carried out in order of size from largest to smallest.
[0063] Based on the characteristics of using T91 spiral benders, the blowing function of the wire drawing machine has been optimized: when rolling 20 to 18 mm specifications, the blowing time is set to 35 seconds per steel. When rolling 17 to 15 mm specifications, the blowing time is set to 30 seconds per steel. When rolling 14 to 13 mm specifications, the blowing time is set to 20 seconds per steel.
[0064] Starting from the beginning of rolling large-size steel, when rolling hard steel (such as 40Cr, 435, 55SⅰCr, etc.), adjust the lead of the wire drawing machine every ten to fifteen pieces. When rolling other steel grades, adjust it every hour, each time by 0.5%, with an adjustment range between 1% and -2.5%.
[0065] Using the above process, the results of large-size rolling scratches in March 2023 are summarized as follows:
[0066] Scratches are generally controllable when rolling 20 to 18 mm specifications.
[0067] When rolling 1215MS steel with a diameter of 20 to 18 mm, the scratches observed this time were significantly improved compared to previous rolling processes: the wire drawing parameters were adjusted during the rolling of 1215MS steel. The lead rate of the wire drawing mill did not need to be adjusted during rolling; a single parameter was consistently used. The air blowing time of the wire drawing mill was set to be 5 seconds shorter than for other steel grades, resulting in a higher temperature in the spiral bending tube of the wire drawing mill. The surface of the finished 1215MS steel is particularly sensitive to scratches.
[0068] When rolling the 17mm specification, a new wire-spinning tube was replaced, and 330 tons of hard wire of 40Cr and 435 steel of 17mm specification were used for the grinding disc.
[0069] After the new spinning tube grinding disc was installed, the overall scratches are still relatively controllable.
[0070] When finishing the rolling of 13mm specification steel, the steel grade was changed to 1215MS steel. Due to improper adjustment, two or three obvious scratches appeared on the surface of the finished product. After adjustment, it was normal.
[0071] The scratch results above show that after the improvement, scratches, folds, and wire breakage are reduced during high-speed industrial wire production and rolling, and the quality of the wire is significantly improved.
[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for preventing abrasion control of wires with a diameter >12mm, characterized in that, This includes: producing wire rods in descending order of specifications, strictly controlling the dimensions of the steel parts after the sizing and reducing mill, and using different rolling parameters for different steel grades and specifications, including: The wire rod production line includes the TMB mill, the first soaking tank, the No. 11 water tank, the second soaking tank, the No. 12 water tank, the G5 pinch roll, the No. 8 flying shear, the G6 pinch roll, the front bending tube of the wire rod feeder, and the wire rod feeder, arranged sequentially along the rolling direction. The production schedule is based on Φ12mm as the boundary. Wire rods larger than Φ12mm are arranged in descending order of size. For steel grades of the same size, they are loaded into the furnace in the order of softest to hardest material, with free-cutting steel of each size being placed last. The selected dimensions for the first heat homogenizing channel, the second heat homogenizing channel, the G5# pinch roller, the G6# pinch roller, and the 8# flying shear are as follows: The dimensions of the first heat-spreading groove, the second heat-spreading groove, the inlet and outlet guides of the G5# pinch roller, and the steel pipe of the 8# flying shear are all Φ32mm. The self-made guide groove and the outlet guide of the No. 8 flying shear are both 32mm in size. The G6# pinch roller inlet guide and roller ring are installed according to the corresponding specification selection standard; The inner diameter dimensions of the straight tube and the spiral tube of the spinning machine are set as follows: The front bending tube of the spinning machine uses a two-wheel rolling bending tube. The positioning requirements for the bending tube guide rollers are as follows: the inner arc surface of the exit side roller is 27±0.5mm away from the lower inner wall of the bending tube, and the inner arc surface of the middle roller is 1.5mm lower than the upper inner wall of the bending tube. The rolling center line of the front bending tube of the spinning machine coincides with the center line of the straight tube of the spinning machine. The centering adjustment is made by adding a furnace number plate at the installation position. The inner diameter of the short inlet conduit of the spinning machine is 34mm and there must be no abnormal wear; the inner diameter of the inner ring of the straight tube of the spinning machine is 34mm ± 0.3mm; The spiral tube is made of T91 and has an inner diameter of Φ40mm. The spiral tube is ground and polished offline by steel wire rope and inspected with an endoscope to remove burrs, slag, pits and bumps. Different rolling parameters are used to control the rolling of wire rods of different steel grades and specifications, as follows: The full clamping function of the G6# pinch roller in front of the spinning machine is prohibited from being put into use; The cooling water in the front bend of the wire drawing machine is turned off when the last steel of each specification is rolled. During each specification change, use an endoscope to inspect the inner wall of the spinning spiral tube. Before inspection, the cooling channel must be purged to avoid damaging the endoscope. The lead rate setting of the wire drawing machine is different for different steel grades and specifications of wire. For the first two rolls of new specifications or new steel grades, the lead rate of the wire drawing machine should be set between -3.0% and -1.0%. During the rolling of non-hard wire steel, the lead rate of the wire drawing machine is controlled between -2.0% and 1.0%. During the rolling of hard wire steel, the lead rate of the wire spinneret is adjusted every 10-15 rolls, with each adjustment being 0.5%, ranging from -2.5% to 1.5%. The adjustment of the lead rate must be synchronized with the wire spinneret support plate to ensure the ring shape remains centered on the air-cooled roller table. The hard wire steel includes any one of SCM435, ML40Cr, 8620, 50BV30, and 55SiCr.
2. The method for preventing abrasion of wires with a diameter >12mm according to claim 1, characterized in that, Also includes: All steel parts must be polished smooth before being put on the line, and there should be no sharp edges or corners at the contact points with the rolled parts. The parts should be tested by bare hand and found to be free of burrs.
3. The method for preventing abrasion of wires with a diameter >12mm according to claim 1, characterized in that, The lead rate of the G6# pinch roller in front of the spinning machine is controlled between 0.5% and 1.0%.
4. The method for preventing abrasion of wires with a diameter >12mm according to claim 1, characterized in that, The standard rolling speed for finished products is set as follows: Φ20mm: 18m / s; Φ19mm: 18m / s; Φ18mm: 18m / s; Φ17mm: 22m / s; Φ16mm: 27m / s; Φ15mm: 30m / s; Φ14mm: 35m / s; Φ13mm: 40m / s.
5. The method for preventing abrasion of wires with a diameter >12mm according to claim 1, characterized in that, A compressed air pipe is installed at the inlet of the spinning machine to prevent cooling water from flowing into the straight or spiral pipe of the spinning machine from the bent guide wheel; The compressed air purging time in the compressed air pipe is set to 20-35 seconds, and purging is stopped after each steel bar has passed through. When rolling 20 to 18 mm specifications, each piece of steel is purged for 35 seconds. When rolling 17 to 15 mm specifications, each piece of steel is purged for 30 seconds. When rolling 14 to 13 mm specifications, each steel bar is purged for 20 seconds.