A method for reducing packing extrusion injury by using 55SiCr hot-rolled wire rod advance amount and packing mode

Abstract

The present invention belongs to the technical field of steel rolling, and specifically relates to a method for reducing packaging extrusion injuries by using the advance amount of wire laying and packaging mode of 55SiCr hot-rolled wire rod. The steel billet is first heated, and then deformed by rough, medium, finishing mills and mini mills respectively, and the advance amount of wire laying is controlled to be ‑3.0% to ‑4.5% for rolling, and the wire laying vibration "322" mode is assisted to be turned on, and the 12-ton spring steel special anti-extrusion injury mode is used for packaging; while ensuring normal production efficiency, the method of the present invention adopts a reasonable wire laying advance amount method, and assists in turning on the wire laying vibration mode, so as to reasonably control the inner ring diameter of the wire rod and the total package length and overall package shape after the lower limit of the coiling, and then matches the 12-ton spring steel special anti-extrusion injury mode for packaging, which can effectively reduce mechanical extrusion injuries during packaging.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling, and specifically relates to a method for reducing packaging extrusion injuries by utilizing the advance amount of wire laying and the packaging mode of 55SiCr hot-rolled wire rods. Specifically, the invention relates to a method for reducing packaging extrusion injuries of 55SiCr hot-rolled wire rods by controlling the difference between the final rolling speed and the wire laying speed based on a high-speed hot-rolled wire rod production line, thereby controlling the inner ring diameter, the overall package shape and the package length of the wire rod to match a specific packaging mode. Background Art

[0002] 55SiCr hot-rolled wire rod is the mainstream raw material of suspension springs. In order to ensure the ultimate fatigue strength and life of suspension springs, it has very high requirements for the surface quality of the wire rod. Generally, 55SiCr hot-rolled wire rod is currently used in suspension springs, with a maximum of Φ13.0-16.0mm two-fire material, fatigue life requirement of more than 500,000 times, and working stress intensity of 1850-2050MPa. Under such high stress conditions, the surface quality requirements of raw materials are particularly high.

[0003] At present, the surface of 55SiCr hot-rolled wire rod should be smooth, without cracks, folds, ears, scars, delamination and inclusions; local indentations, bumps, scratches and pits are allowed, and their depth or height should not exceed 0.07mm from the actual size. For the above defects, major steel companies at home and abroad have basically formed a relatively reliable control experience, and the frequency of the above defects is decreasing. In addition, a major link that causes surface defects in raw materials is the packaging process of wire rods, which mainly causes extrusion injuries between wire rods. There are three types of morphology: strip extrusion injuries, point extrusion injuries, and packaging wire bumps and strangulation injuries. Generally, the depth of packaging extrusion injuries is above 0.07mm. If they are not removed cleanly, it will have a direct impact on the fatigue life of the final suspension spring, and the fatigue life may be greatly reduced.

[0004] The general processing technology of 55SiCr automobile suspension spring is shot blasting-pre-drawing-flaw detection-grinding-drawing-heat treatment-flaw detection-finished steel wire. However, if there are a lot of packing and extrusion damage on the surface of the raw material hot-rolled wire rod, it will greatly affect the working efficiency of the grinding process. The time from shot blasting to grinding of a normal package of 1.9 tons of wire rod is 30-45 minutes. The wire rod with many packing and extrusion damage on the surface is also 1.9 tons. It may take 120-180 minutes from shot blasting to grinding, which greatly reduces the production efficiency of automobile suspension spring steel wire. Generally, mainstream automobile suspension spring steel wire manufacturers hope that upstream raw material suppliers can perform eddy current flaw detection on the defects of a single package of raw materials with an accuracy of 0.05mm and control them within 100 points. A few advanced enterprises require defects ≤60 points / package.

[0005] In summary, the control of the surface quality of 55SiCr hot-rolled wire rod, especially the packaging squeeze injury, is particularly important. The traditional idea is to debug a specific packaging program and reduce and control the number of packaging squeeze injuries by optimizing the packaging process. There are few productive prevention and control methods. How to control the inner ring diameter, overall package shape and package length of the wire rod from the rolling and cooling process to match a specific packaging mode, so as to prevent the subsequent packaging squeeze injury, is still relatively blank. Summary of the invention

[0006] The purpose of the present invention is to provide a method for reducing the compression injury of baling by using the advance amount of 55SiCr hot-rolled wire rod spinning and the packaging mode. The core is based on a high-speed hot-rolled wire rod production line, by controlling the difference between the final rolling speed and the spinning speed, to control the inner diameter of the wire rod, the overall package shape and the package length, so as to match a specific packaging mode to reduce the compression injury of 55SiCr hot-rolled wire rod packaging. The inner diameter of the wire rod obtained is 92-105mm, the package length of the wire rod before packaging is stable at 180-210cm, the package shape is compact, the staggered circles are uniform, there is no wire rod extrusion sound during the packaging process, the package shape is intact after packaging, it is not easy to collapse or tilt the package, it can be stacked and transported in multiple layers, the package length is controlled at 150-160cm, the package extrusion injury can be seen visually at 45-60 points / package when unpacking, and the eddy current flaw detection of downstream customers is stably controlled at ≤60 points / package according to the number of 0.05mm defect points.

[0007] In order to achieve the above technical purpose, the present invention provides a method for reducing the compression injury of baling by using the advance wire laying amount and packaging mode of 55SiCr hot-rolled wire rod, the billet is heated, the rolling is controlled, the wire laying oscillation is performed, the wire laying advance amount is performed, and the compression injury prevention mode is packaged. The specific process steps are as follows:

[0008] (1) The steel billet is heated in a regenerative heating furnace at a temperature of 800 to 1150°C for 85 to 140 minutes;

[0009] (2) After the billet leaves the heating furnace, it is subjected to rough, medium, and finishing rolling and mini rolling at 800-950°C;

[0010] (3) After rolling, the spinning temperature is controlled at 860-910°C by adjusting the water tank flow rate;

[0011] (4) The spinning machine is turned on the "322" swing mode, that is, the swing period is 3 seconds / time, and the left and right swing amplitude is ±2.0%;

[0012] (5) Control the advance amount of wire laying at -3.0% to -4.5%, that is, the wire laying speed should be 3.0% to 4.5% slower than the speed of the rolled piece leaving the mini rolling mill; ensure that the inner ring diameter of the wire rod is 92 to 105 mm, the package length is stable at 180 to 210 cm, and match the subsequent packaging mode;

[0013] (6) After spinning, the silk is put on the Stelmor air cooling line and the blanks are rolled up.

[0014] (7) A Siemens baler was used for baling. The baling wire was Φ8 mm DBS-2 with 8 strips. The baling pressure was set to 12 tons. The baling mode was a special anti-squeezing mode for spring steel. The specific baling parameters were set as shown in Table 1. The baling length was controlled at 150 to 160 cm after baling.

[0015] Furthermore, in step (1), the 160*160*11000mm steel billet is heated in a regenerative heating furnace at a temperature of 800-860°C for 30-50 min in the first heating stage, at a temperature of 920-1100°C for 30-50 min in the second heating stage, and at a temperature of 1100-1150°C for 25-40 min in the equalizing stage.

[0016] Furthermore, in step (4), the spinning machine starts the swing "322" mode, that is, the swing period is 3 seconds / time, and the left and right swing amplitude is ±2.0%.

[0017] Furthermore, in step (5), the spinning machine controls the spinning advance amount to be -3.0% to -4.5%, that is, the spinning speed is 3.0% to 4.5% slower than the speed of the rolled piece leaving the mini rolling mill, and the spinning speed is controlled at 23.875 m / s to 27.16 m / s. By controlling the difference between the final rolling speed and the spinning speed, the inner ring diameter of the wire rod is controlled to be 92 to 105 mm, the package length is stabilized at 180 to 210 cm, and the overall package shape is intact, so as to match the specific packaging mode of step (7).

[0018] Furthermore, in step (7), a Siemens baler is used for baling, and 8 strips of Φ8mm DBS-2 baling wire are used, the baling pressure is set to 12 tons, the baling mode is a special anti-squeezing injury mode for spring steel, and the baling parameters are solidified to achieve a high-speed section for pressing once to ensure the length of the package after baling, the displacement distance of the pressure plate is matched with the length of the package, and the slow squeezing of the slow section for pressing once and the slow squeezing of the second pressing section is used to reduce the baling squeezing injury. The specific baling parameter settings are shown in Table 1.

[0019] Table 1 Parameters of the anti-crushing mode for 12-ton spring steel

[0020]

[0021] The hydraulic proportional valves of 1# pressure plate (right pressure plate) and 2# pressure plate (left pressure plate) are opened by 48.5% to 51.5%, and the pressure plate has a rapid early displacement (measured 0.50 to 0.60 m / s). After contacting the end of the wire rod, it is subjected to reaction resistance. The instrument displays a pressure of 12 tons and switches to the slow section. The fast and slow switching timing can be adjusted by the fast and slow switching flow of the pressure plate, that is, 12 tons * (1-20%) to 12 tons * (1-16%) = 9.6 to 10.08 tons, which is suitable for the spring steel anti-extrusion mode;

[0022] The hydraulic proportional valves of 1# pressure plate (right pressure plate) and 2# pressure plate (left pressure plate) are opened by 22.5% to 27.5%, and the pressure plate has a slow initial displacement (measured 0.05 to 0.06 m / s). At the same time, the baling wire 1# to 4# lines are first drawn from the baling wire drum at speeds of 90 cm / s, 90 cm / s, 80 cm / s, and 90 cm / s, respectively. The pressure plate maintains a slow speed pressure of 9.6 to 10.08 tons, and the baling wires of 1# to 4# lines are tightened and knotted at speeds of 75 cm / s, 75 cm / s, 70 cm / s, and 75 cm / s, respectively. The pressure plate moves in the opposite direction, and the baling is completed.

[0023] Negative value is a specific identification method on the operation interface.

[0024] The chemical composition of the 55SiCr hot-rolled wire rod is calculated by mass percentage, and the ratio is C: 0.51-0.59%, Si: 1.20-1.60%, Mn: 0.50-0.80%, Cr: 0.50-0.80%, P≤0.025%, S≤0.020%, Ni≤0.35%, Cu≤0.25%, and the rest is iron and unavoidable impurities.

[0025] The inner ring diameter of the 55SiCr hot-rolled wire rod obtained by the present invention is 92-105mm, the length of the wire rod package before packaging is stable at 180-210cm, the package shape is compact, the staggered circles are uniform, there is no wire rod extrusion sound during the packaging process, the package shape is intact after packaging, it is not easy to collapse or tilt the package, and it can be stacked and transported in multiple layers. The package length is controlled at 150-160cm. The package extrusion damage can be seen visually during unpacking inspection at 45-60 points / package. The number of defect points of downstream customers' eddy current flaw detection is stably controlled at ≤60 points / package according to 0.05mm (high standard flaw detection accuracy). If the downstream customers' eddy current flaw detection is based on 0.10mm (currently the commonly used standard in China), the number of defect points in batch verification is stably controlled at ≤8 points / package,

[0026] The present invention starts the oscillation "322" mode through the spinning machine, that is, the oscillation period is 3 seconds / time, and the left and right oscillation amplitude is ±2.0%, which can achieve early misalignment between the wire rods and the packing shape is compact, and can effectively avoid forced displacement and misalignment during the packaging process, thereby causing extrusion injuries between the wire rods.

[0027] The present invention proposes for the first time to control the wire laying machine to lay wire in a specific range, that is, the wire laying speed should be slower than the speed of the rolled piece out of the mini rolling mill within a specific range, so as to obtain a specific wire rod inner ring diameter and a package length before packaging to match the existing spring steel special anti-extrusion injury mode. The wire laying machine starts the swing "322" mode, that is, the swing period is 3 seconds / time, and the left and right swing amplitude is ±2.0%.

[0028] The core of the present invention controls the advance amount of the spinning machine to be -3.0% to -4.5%, that is, the spinning speed is 3.0% to 4.5% slower than the speed of the rolled piece out of the mini rolling mill, ensuring that the inner ring diameter of the wire rod is 92 to 105 mm, effectively shortening the package length before packaging, and stabilizing the package length at 180 to 210 cm to match the existing spring steel packaging mode, reducing displacement extrusion, and thus reducing packaging extrusion injuries. DETAILED DESCRIPTION

[0029] The present invention is combined with high-speed wire controlled rolling and controlled cooling technology to illustrate the production implementation of rolling a steel billet with a cross section of 160*160*11000mm into 55SiCr hot-rolled wire rods with finished specifications of Φ13.0mm and Φ16.0mm.

[0030] Example 1 (Φ13.0 mm 55SiCr hot-rolled wire rod)

[0031] 1. Billet heating

[0032] The composition of the rolled steel sheet is C: 0.53%, Si: 1.42%, Mn: 0.66%, Cr: 0.67%, P: 0.013%, S: 0.008%, Ni: 0.014%, Cu: 0.012%, and the rest is iron and unavoidable impurities.

[0033] The steel billet with a cross section of 160*160*11000mm is heated in a regenerative heating furnace at a temperature of 850-860°C for 45 minutes in the first heating stage, at a temperature of 930-1090°C for 40 minutes in the second heating stage, and at a temperature of 1100-1130°C for 30 minutes in the equalizing stage.

[0034] 2. Controlled rolling

[0035] After the billet leaves the heating furnace, the oxidized iron scale on the billet surface is removed by turning on the 18MPa high-pressure water, and the rolling temperature of the billet is 900-1020℃; the billet is rolled at a temperature of 880-920℃ in the finishing mill and at a temperature of 820-860℃ in the mini mill by turning on the cooling water between the stands, and the rolling speed of the mini mill is 28.0m / s.

[0036] 3. Spinning into a circle

[0037] After final rolling, the water tank flow is adjusted to control the wire rod spinning temperature at 860-900°C, the spinning speed at 26.75m / s, the actual spinning advance amount at -4.46%, and the spinning oscillation "322" mode is turned on, with a swing period of 3 seconds / time and a left and right swing amplitude of ±2.0%.

[0038] 4. Controlled cooling after rolling

[0039] After spinning into a coil, the wire rod is cooled by a fan on a Stelmor roller table and rolled into a package using a nose cone mandrel. The package length before packaging is 197 to 205 cm and the inner diameter of the wire rod is 94 to 98 cm.

[0040] 5. Packing and storage

[0041] The baling was done by a Siemens baler (model 1NDBS020023 automatic strapping machine and baling machine), 8-pass Φ8mm DBS-2 baling wire was used, the baling pressure was set to 12 tons, and the baling mode was a special anti-squeezing mode for spring steel. The actual baling parameters are shown in Table 2 below.

[0042] Table 2 Φ13.0mm 55SiCr hot rolled wire rod packaging parameters

[0043]

[0044] The inner ring diameter of the 55SiCr hot-rolled wire rod produced according to Example 1 is 94-98 mm, the wire rod package length before packaging is stable at 197-205 cm, the package shape is compact, the staggered circles are uniform, there is no wire rod squeezing sound during the packaging process, the package shape is intact after packaging, it is not easy to collapse or tilt, and it can be stacked and transported in multiple layers. The package length after packaging is controlled at 155-160 cm. Please refer to Table 3 below for the surface physical quality.

[0045] Table 3 Surface quality of Φ13.0mm 55SiCr hot rolled wire rod

[0046]

[0047] Unpacking inspection visually shows 45 to 60 points of compression damage per package. Eddy current flaw detection of downstream customers’ unpacking materials is stably controlled at 32 to 60 points per package according to the number of 0.05mm defects.

[0048] Example 2 (Φ16.0 mm 55SiCr hot-rolled wire rod)

[0049] 1. Billet heating

[0050] The composition of the rolled steel sheet is C: 0.55%, Si: 1.41%, Mn: 0.67%, Cr: 0.65%, P: 0.010%, S: 0.008%, Ni: 0.010%, Cu: 0.015%, and the rest is iron and inevitable impurities.

[0051] The steel billet with a cross section of 160*160*11000mm was heated in a regenerative heating furnace at a temperature of 850-860°C for 35 minutes in the first heating stage, at a temperature of 930-1060°C for 38 minutes in the second heating stage, and at a temperature of 1100-1145°C for 32 minutes in the equalizing stage.

[0052] 2. Controlled rolling

[0053] After the billet leaves the heating furnace, the oxidized iron scale on the billet surface is removed by turning on the 18MPa high-pressure water, and the rolling temperature of the billet is 900-1020℃; the billet is rolled at a temperature of 880-920℃ in the finishing mill and at a temperature of 820-860℃ in the mini mill by turning on the cooling water between the stands, and the rolling speed of the mini mill is 25.0m / s.

[0054] 3. Spinning into a circle

[0055] After final rolling, the water tank flow is adjusted to control the wire rod spinning temperature at 860-900°C, the spinning speed at 24.23m / s, the actual spinning advance amount at -3.08%, and the spinning oscillation "322" mode is turned on, with a swing period of 3 seconds / time and a left and right swing amplitude of ±2.0%.

[0056] 4. Controlled cooling after rolling

[0057] After spinning into a coil, the wire rod is kept warm and cooled by a fan on a Stelmor roller table, and is rolled into a package using a nose cone mandrel. The package length before packaging is 180 to 196 cm, and the inner diameter of the wire rod is 92 to 96 cm.

[0058] 5. Packing and storage

[0059] The baling was done by a Siemens baler, with Φ8mm DBS-2 baling wire used in 8 passes, the baling pressure set to 12 tons, and the baling mode set to the spring steel special anti-crushing injury mode. The actual baling parameters are shown in Table 4 below.

[0060] Table 4 Φ16.0mm 55SiCr hot rolled wire rod packaging parameters

[0061]

[0062] The inner ring diameter of the 55SiCr hot-rolled wire rod produced according to Example 2 is 92-96 mm, the wire rod package length before packaging is stable at 180-196 cm, the package shape is compact, the staggered circles are uniform, there is no wire rod squeezing sound during the packaging process, the package shape is intact after packaging, it is not easy to collapse or tilt, and it can be stacked and transported in multiple layers. The package length after packaging is controlled at 155-160 cm. Please refer to Table 5 below for the surface physical quality.

[0063] Table 5 Surface quality of Φ16.0mm 55SiCr hot rolled wire rod

[0064]

[0065] Unpacking inspection visually shows 46 to 56 points of compression damage per package. Eddy current flaw detection of downstream customers' unpacking materials is stably controlled at 32 to 58 points per package according to the number of 0.05mm defects.

[0066] Comparative Example 1 (Φ13.0mm 55SiCr hot-rolled wire rod)

[0067] Compared with Example 1, the main differences of Comparative Example 1 are as follows: in the packaging parameters of Step 5, the packaging pressure is increased to 18 tons, the flow rate of the automatic forward fast section of the 1# and 2# pressure plates is increased to 550‰, and the other conditions are the same as those of Example 1.

[0068] The inner ring diameter of the 55SiCr hot-rolled wire rod produced according to Comparative Example 1 is 94-98 mm, the wire rod package length before packaging is stable at 197-205 cm, the package shape is intact, but the wire rod extrusion sound is obvious during the packaging process, the package after packaging is short and easy to slide off the C-hook, and the package length after packaging is only 130-145 cm. Please refer to Table 6 below for the surface physical quality.

[0069] Table 6 Surface quality of Φ13.0mm 55SiCr hot rolled wire rod

[0070]

[0071] Unpacking inspection visually shows that the number of compression damages on the packaging is 217 to 303 points per package. The number of 0.05mm defect points in eddy current flaw detection of downstream customers is stably controlled at 354 to 456 points per package.

[0072] Comparative Example 2 (Φ16.0mm 55SiCr hot-rolled wire rod)

[0073] Compared with Example 2, the main difference of Comparative Example 2 is that in the packaging parameters of Step 5, the speed flow rate of the 1# pressure plate in the automatic forward fast section is adjusted to 400‰, the speed flow rate of the 1# pressure plate in the automatic forward slow section is adjusted to 365‰, the speed flow rate of the 2# pressure plate in the automatic forward fast section is adjusted to 410‰, and the speed flow rate of the 2# pressure plate in the automatic forward slow section is adjusted to 360‰. Other conditions are the same as in Example 2.

[0074] The inner ring diameter of the 55SiCr hot-rolled wire rod produced in accordance with Comparative Example 2 is 92-96 mm, the wire rod package length before packaging is stable at 183-196 cm, the package shape is intact, but the extrusion sound of the wire rod in the slow section during the packaging process is obvious, the package shape after packaging is too long, easy to collapse and tilt, and cannot be stacked and transported in multiple layers. The package length after packaging is controlled at 172-180 cm. Please refer to Table 7 below for the surface physical quality.

[0075] Table 7 Surface quality of Φ16.0mm 55SiCr hot rolled wire rod

[0076]

[0077] Unpacking inspection visually shows that the number of compression marks on the packaging is 136 to 236 points per package. The number of 0.05mm defect points in eddy current flaw detection for downstream customers is stably controlled at 156 to 257 points per package.

[0078] Comparative Example 3 (Φ13.0mm 55SiCr hot-rolled wire rod)

[0079] Compared with Example 1, the main difference of Comparative Example 3 is that the spinning speed in step 3 of Example 1 is adjusted to 27.65 m / s, and the actual spinning advance amount is -1.25%; in the packaging parameters of step 5, the automatic forward fast section speed flow of 1# pressure plate is adjusted to 510‰, the automatic forward slow section speed flow of 1# pressure plate is adjusted to 260‰, the automatic forward fast section speed flow of 2# pressure plate is adjusted to 510‰, the automatic forward slow section speed flow of 2# pressure plate is adjusted to 260‰, and the fast and slow switching flow of the pressure plate is adjusted to -145‰, and other conditions are the same as Example 1.

[0080] The inner ring diameter of the 55SiCr hot-rolled wire rod produced in Comparative Example 3 is 85-87 mm, the wire rod package length before packaging is stable at 230-260 cm, the package shape is loose, the wire rod extrusion sound is obvious during the packaging process, the package shape after packaging is long, easy to collapse and slant, and cannot be stacked and transported in multiple layers. The package length after packaging is controlled at 175-180 cm. Please refer to Table 8 below for the surface physical quality.

[0081] Table 8 Surface quality of Φ13.0mm 55SiCr hot rolled wire rod

[0082]

[0083]

[0084] Unpacking inspection visually shows that the number of compression marks on the packaging is 132 to 226 points per package. The number of 0.05mm defect points in eddy current testing of downstream customers is stably controlled at 112 to 268 points per package.

[0085] Comparative Example 4 (Φ13.0mm 55SiCr hot-rolled wire rod)

[0086] Compared with Example 1, the main difference of Comparative Example 4 is that the spinning speed in step 3 of Example 1 is adjusted to 27.17 m / s, and the actual spinning advance amount is -2.96%; in the packaging parameters of step 5, the automatic forward fast section speed flow of 1# pressure plate is adjusted to 480‰, the automatic forward slow section speed flow of 1# pressure plate is adjusted to 220‰, the automatic forward fast section speed flow of 2# pressure plate is adjusted to 480‰, the automatic forward slow section speed flow of 2# pressure plate is adjusted to 220‰, and the fast and slow switching flow of the pressure plate is adjusted to -205‰, and other conditions are the same as in Example 1.

[0087] The inner ring diameter of the 55SiCr hot-rolled wire rod produced according to Comparative Example 4 is 83-86 mm, the wire rod package length before packaging is stable at 240-260 cm, the package shape is loose, the wire rod extrusion sound is obvious during the packaging process, the package shape after packaging is long, easy to collapse and slant, and cannot be stacked and transported in multiple layers. The package length after packaging is controlled at 180-190 cm. Please refer to Table 9 below for the surface physical quality.

[0088] Table 9 Surface quality of Φ13.0mm 55SiCr hot rolled wire rod

[0089]

[0090] Unpacking inspection visually shows that the number of compression marks on the packaging is 107 to 233 points per package. The number of 0.05mm defect points in eddy current flaw detection of downstream customers is stably controlled at 117 to 245 points per package.

[0091] Comparative Example 5 (Φ13.0mm 55SiCr hot-rolled wire rod)

[0092] Compared with Example 1, the main difference of Comparative Example 5 is that the spinning speed in step 3 of Example 1 is adjusted to 26.71 m / s, and the actual spinning advance amount is -4.61%; other conditions are the same as Example 1.

[0093] The inner ring diameter of the 55SiCr hot-rolled wire rod produced in Comparative Example 5 is 83-88 mm, the wire rod package length before packaging is stable at 220-240 cm, the package shape is loose, the wire rod extrusion sound is obvious during the packaging process, the package shape after packaging is long, easy to collapse and slant, and cannot be stacked and transported in multiple layers. The package length after packaging is controlled at 175-190 cm. Please refer to Table 10 below for the surface physical quality.

[0094] Table 10 Surface quality of Φ13.0mm 55SiCr hot rolled wire rod

[0095]

[0096] Unpacking inspection visually shows that the number of compression damages on the packaging is 109 to 189 points per package. The number of 0.05mm defect points in eddy current flaw detection of downstream customers is stably controlled at 121 to 202 points per package.

[0097] Comparative Example 6 (Φ16.0mm 55SiCr hot-rolled wire rod)

[0098] Compared with Example 2, Comparative Example 6 has the following main differences: the spinning speed in step 3 of Example 1 is adjusted to 24.75 m / s, and the actual spinning advance amount is -1.00%; in the packaging parameters of step 5, the automatic forward fast section speed flow of 1# pressure plate is adjusted to 520‰, the automatic forward slow section speed flow of 1# pressure plate is adjusted to 210‰, the automatic forward fast section speed flow of 2# pressure plate is adjusted to 520‰, the automatic forward slow section speed flow of 2# pressure plate is adjusted to 210‰, and the fast and slow switching flow of the pressure plate is adjusted to -205‰. Other conditions are the same as in Example 2.

[0099] The inner ring diameter of the 55SiCr hot-rolled wire rod produced according to Comparative Example 6 is 83-87 mm, the wire rod package length before packaging is stable at 230-260 cm, the package shape is loose, the wire rod extrusion sound is obvious during the packaging process, the package shape after packaging is long, easy to collapse and slant, and cannot be stacked and transported in multiple layers. The package length after packaging is controlled at 178-183 cm. The surface physical quality is shown in Table 11 below.

[0100] Table 11 Surface quality of Φ16.0mm 55SiCr hot rolled wire rod

[0101]

[0102] Unpacking inspection visually shows that the number of compression damages on the packaging is 114 to 222 points per package. The number of 0.05mm defect points in eddy current flaw detection of downstream customers is stably controlled at 128 to 213 points per package.

[0103] Comparative Example 7 (Φ16.0mm 55SiCr hot-rolled wire rod)

[0104] Compared with Example 2, Comparative Example 7 has the following main differences: the spinning speed in step 3 of Example 1 is adjusted to 24.26 m / s, and the actual spinning advance amount is -2.96%; in the packaging parameters of step 5, the automatic forward fast section speed flow of 1# pressure plate is adjusted to 460‰, the automatic forward slow section speed flow of 1# pressure plate is adjusted to 210‰, the automatic forward fast section speed flow of 2# pressure plate is adjusted to 460‰, the automatic forward slow section speed flow of 2# pressure plate is adjusted to 210‰, and the fast and slow switching flow of the pressure plate is adjusted to -145‰. Other conditions are the same as in Example 1.

[0105] The inner diameter of the 55SiCr hot-rolled wire rod produced in accordance with Comparative Example 7 is 83-89 mm, the wire rod package length before packaging is stable at 235-260 cm, the package shape is loose, the wire rod extrusion sound is obvious during the packaging process, the package shape after packaging is long, easy to collapse and slant, and cannot be stacked and transported in multiple layers. The package length after packaging is controlled at 180-195 cm. Please refer to Table 12 below for the surface physical quality.

[0106] Table 12 Surface quality of Φ16.0mm 55SiCr hot rolled wire rod

[0107]

[0108]

[0109] Unpacking inspection visually shows that the number of compression marks on the packaging is 107 to 233 points per package. The number of 0.05mm defect points in eddy current flaw detection of downstream customers is stably controlled at 117 to 245 points per package.

[0110] Comparative Example 8 (Φ16.0mm 55SiCr hot-rolled wire rod)

[0111] Compared with Example 2, the main difference of Comparative Example 8 is that the spinning speed in step 3 of Example 1 is adjusted to 23.87 m / s, the actual spinning advance amount is -4.52%, and the other conditions are the same as Example 2.

[0112] The inner ring diameter of the 55SiCr hot-rolled wire rod produced in accordance with Comparative Example 8 is 80-86 mm, the wire rod package length before packaging is stable at 240-260 cm, the package shape is loose, the wire rod extrusion sound is obvious during the packaging process, the package shape after packaging is long, easy to collapse and slant, and cannot be stacked and transported in multiple layers. The package length after packaging is controlled at 180-185 cm. Please refer to Table 13 below for the surface physical quality.

[0113] Table 13 Surface quality of Φ16.0mm 55SiCr hot rolled wire rod

[0114]

[0115] Unpacking inspection visually shows that the number of compression damages on the packaging is 113 to 213 points per package. The number of 0.05mm defect points in eddy current flaw detection of downstream customers is stably controlled at 121 to 220 points per package.

[0116] The inner ring diameter of the 55SiCr hot-rolled wire rod obtained by the present invention is 92 to 105 mm, the wire rod package length before packaging is stable at 180 to 210 cm, the package shape is compact, the staggered circles are uniform, there is no wire rod extrusion sound during the packaging process, the package shape is intact after packaging, it is not easy to collapse or tilt the package, and it can be stacked and transported in multiple layers. The package length is controlled at 150 to 160 cm, and the package extrusion damage can be visually seen at 45 to 60 points / package during unpacking inspection. The eddy current flaw detection of downstream customers is stably controlled at ≤60 points / package according to the number of 0.05 mm defect points. The core of the present invention is a method for reducing the packaging extrusion damage of 55SiCr hot-rolled wire rods based on a high-speed hot-rolled wire rod production line, by controlling the difference between the final rolling speed and the spinning speed, to control the inner ring diameter of the wire rod, the overall package shape and the package length to match a specific packaging mode.

[0117] The raw materials and equipment used in the present invention, unless otherwise specified, are all commonly used raw materials and equipment in the art; the methods used in the present invention, unless otherwise specified, are all conventional methods in the art. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the above embodiments based on the technical essence of the present invention is included in the protection scope of the present invention.

Claims

1. A method for reducing packaging extrusion injuries by utilizing the advance amount of wire laying and packaging mode of 55SiCr hot-rolled wire rods, characterized in that: The method comprises: heating the steel billet, controlling the rolling, spinning vibration, spinning ahead of the wire, and packaging in an anti-squeezing injury mode, and the specific steps are as follows: (1) The steel billet is heated in a regenerative heating furnace at a temperature of 800-1150°C for 85-140 minutes; (2) After the billet leaves the heating furnace, it is subjected to rough, medium, and finishing rolling and mini mill deformation at 800-950°C; (3) After rolling, the water tank flow rate is adjusted to control the spinning temperature at 860-910°C; (4) The spinning machine is turned on the "322" swing mode, that is, the swing period is 3 seconds / time, and the left and right swing amplitude is ±2.0%; (5) Control the advance amount of wire laying at -3.0%~-4.5%, that is, the wire laying speed should be 3.0%~4.5% slower than the speed of the rolled piece leaving the mini rolling mill; (6) After spinning, the silk is put on the Stelmor air cooling line, and the material is rolled up; (7) The baling machine is used for baling. The baling wire is Φ8mm DBS-2 with 8 strips. The baling pressure is set to 12 tons. The baling mode is a special anti-squeezing mode for spring steel.

2. The method for reducing packing extrusion injury by utilizing the advance amount of wire laying and packing mode of 55SiCr hot-rolled wire rod according to claim 1, characterized in that: The chemical composition of the 55SiCr hot-rolled wire rod is calculated by mass percentage, and the ratio is C: 0.51-0.59%, Si: 1.20-1.60%, Mn: 0.50-0.80%, Cr: 0.50-0.80%, P≤0.025%, S≤0.020%, Ni≤0.35%, Cu≤0.25%, and the rest is iron and unavoidable impurities.

3. The method for reducing packing extrusion injury by utilizing the advance amount of wire laying and packing mode of 55SiCr hot-rolled wire rod according to claim 1, characterized in that: Step (1) The 160*160*11000mm steel billet is heated in a regenerative heating furnace at a temperature of 800-860°C for 30-50 min in the first heating stage, at a temperature of 920-1100°C for 30-50 min in the second heating stage, and at a temperature of 1100-1150°C for 25-40 min in the soaking stage.

4. The method for reducing packing extrusion injury by utilizing the advance amount of wire laying and packing mode of 55SiCr hot-rolled wire rod according to claim 1, characterized in that: Specific packaging parameters are as follows: the flow rate of the 1# pressure plate's automatic forward fast section speed is 485‰~515‰; the timing of switching the pressure plate's speed: the pressure of the fast section pressure plate reaches 12 tons; the flow rate of the 1# pressure plate's automatic forward slow section speed is 225‰~275‰; the flow rate of the 2# pressure plate's automatic forward fast section speed is 485‰~515‰; the flow rate of the 2# pressure plate's automatic forward slow section speed is 225‰~275‰; the flow rate of switching the pressure plate's speed is -160‰~-200‰; the wire drawing and feeding speed in the packaging wire drum: the wire feeding speed of the 1# packaging wire channel: -900 / 10 (cm / s); 2# packing wire feeding speed -900 / 10 (cm / s); 3# packing wire feeding speed -800 / 10 (cm / s); 4# packing wire feeding speed -900 / 10 (cm / s); Tightening and knotting speed: 1# packing wire feeding speed: -750 / 10 (cm / s); 2# packing wire feeding speed -750 / 10 (cm / s); 3# packing wire feeding speed -700 / 10 (cm / s); 4# packing wire feeding speed -750 / 10 (cm / s).

5. A 55SiCr hot-rolled wire rod packaged according to the method according to any one of claims 1 to 4, characterized in that: The inner ring diameter of the obtained wire rod is 92~105mm, the wire rod package length is stable at 180~210cm before packaging, and the package length is controlled at 150~160cm. The eddy current flaw detection of downstream customers is stably controlled at ≤60 points / package according to the number of 0.05mm defects.

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