A method for producing steel wool steel by adopting bidirectional cotton scraping process

Abstract

The present invention adopts a method for producing steel wool steel by a bidirectional cotton scraping process, which comprises the steps of wire rod inspection, drawing, crack measurement and cotton scraping; after the wire rod is drawn, a steel wire is obtained, which is wound on a winding wheel and subjected to a cotton scraping process by a cotton scraping knife, and the scraped steel wool steel is collected as a raw material for the production of steel wool, and the remaining tailings are recycled as scrap steel; wherein the cotton scraping knife adopts a bidirectional alternating cotton scraping or a bidirectional simultaneous cotton scraping method to perform symmetrical longitudinal planing on the inner side and the outer side of the steel wire, the depth of the cotton scraping knife scraping the inner side of the steel wire at a single time is the same as the depth of the cotton scraping knife scraping the outer side of the steel wire at the corresponding time, the cumulative cotton scraping depth of the inner side or the outer side of the steel wire is 7 / 8 of the radius of the steel wire, the thickness of the remaining tailings is 1 / 4 of the radius of the steel wire, the central axis of the remaining tailings coincides with the central axis of the steel wire, and the inner planing surface and the outer planing surface of the steel wire after the remaining tailings are both rectangular.

Description

Technical Field

[0001] The invention relates to the field of steel processing, and in particular to a method for producing steel wool steel by adopting a bidirectional wool scraping process. Background Art

[0002] Steel wool steel is a kind of low-carbon steel. The steel wool produced is a new type of "flexible sandpaper", which can be widely used in the grinding, cleaning and polishing of furniture, stone, handicrafts, hardware equipment and other surfaces. It has many advantages such as superior wear resistance, good flexibility and reusability. The downstream deep processing procedures of steel wool steel mainly include drawing and scraping: the original hot-rolled wire rod of φ6.5mm is subjected to 8-10 continuous cold drawing to obtain a smooth steel wire of φ2.88mm. The smooth steel wire is scraped to obtain the steel wire surface, and the remaining arc-shaped tailings are recycled as scrap steel. However, the wire rod is prone to scratch defects during the previous drawing process. When the defect depth accounts for more than 5% of the thickness of the remaining tailings, the steel wire is very likely to break during the scraping process. The broken wire during the scraping process poses a great safety hazard to personnel and equipment. In addition, the broken wire will not only cause material waste, but also require a lot of manpower to remedy.

[0003] At present, the scraping of steel wire mainly adopts the single-sided scraping method, that is, the scraping process is carried out on the outside of the steel wire by using the scraper cotton. With the single-sided scraping method, the steel wire is easy to shake during the scraping process, and the wire is very easy to break due to the cracks on the surface of the steel wire. Moreover, the original hot-rolled wire rod of φ6.5mm is subjected to 8-10 continuous cold drawing to obtain a smooth steel wire of φ2.88mm. The thickness of the remaining tail material in the normal deep processing scraping process is about 1 / 2 of the steel wire radius (i.e. 0.72mm). Therefore, the scratch depth of the steel wire surface should be controlled within 5% of the thickness of the remaining tail material (0.72mm*5%=0.036mm), which puts forward quite strict surface quality protection requirements for the previous continuous cold drawing. Assuming that there is a 0.06mm edge scratch on the steel wire surface, the safe thickness of the scraping tail material is 1.2mm, and the scraping wire utilization rate is low. However, when the thickness of the scraping tail material is less than 1.2mm, the risk of scraping wire breakage is extremely high. Summary of the invention

[0004] In order to overcome the above problems, the purpose of the present invention is to provide a method for producing steel wool steel using a bidirectional cotton scraping process, which can not only improve the utilization rate of steel wire, but also significantly reduce the wire breakage rate during the cotton scraping process.

[0005] To achieve the above-mentioned purpose, the present invention is a method for producing steel wool steel by using a bidirectional cotton scraping process, which includes the steps of wire rod inspection, drawing, crack measurement, and cotton scraping; after the wire rod is drawn, a steel wire is obtained, the crack depth on the steel wire is measured, and the steel wire with a crack depth less than 150 μm is selected, which is wound on a steel wire winding wheel and subjected to the cotton scraping process of a cotton scraping knife, and the scraped steel wool steel is collected as the raw material for the production of steel wool, and the remaining tailings are recycled as scrap steel; wherein the side of the steel wire in contact with the steel wire winding wheel is the inner side of the steel wire, and the side of the steel wire that is in contact with the inner side of the steel wire is the inner side of the steel wire. The opposite side is the outer side of the steel wire; the cotton scraping process is that the cotton scraping knife adopts a two-way alternating cotton scraping or a two-way simultaneous cotton scraping method to perform symmetrical longitudinal planing on the inner side and the outer side of the steel wire, the depth of the cotton scraping knife scraping the inner side of the steel wire in a single time is the same as the depth of the cotton scraping knife scraping the outer side of the steel wire in the corresponding time, the cumulative cotton scraping depth of the inner side or the outer side of the steel wire is 7 / 8 of the radius of the steel wire, the thickness of the remaining tailings is 1 / 4 of the radius of the steel wire, the central axis of the remaining tailings coincides with the central axis of the steel wire, and the inner planing surface and the outer planing surface of the steel wire through the remaining tailings are both rectangular.

[0006] As a preferred solution, in the cotton scraping process, the running speed of the steel wire is 30-50 mm / s; and the downward pressure of the cotton scraping knife on the steel wire is 90-130N.

[0007] As a preferred solution, when the crack depth is 120μm≤and the crack depth is less than 150μm, the running speed of the steel wire in the scraping process is 30-40mm / s, and the downward pressure of the scraper on the steel wire is 90-110N; when the crack depth is less than 120μm, the running speed of the steel wire in the scraping process is 40-50mm / s, and the downward pressure of the scraper on the steel wire is 110-130N.

[0008] As a preferred solution, the scraper knife adopts a bidirectional alternating scraping method in the scraping process. Specifically, the scraper knife first planes the inner side of the steel wire, and then planes the outer side of the steel wire after the inner side of the steel wire is planed. Then, the scraping is performed alternately in the order of first the inner side of the steel wire and then the outer side of the steel wire. When the crack depth is 120μm≤<150μm, the scraper knife direction is adjusted ≥4 times; when the crack depth is <120μm, the scraper knife direction is adjusted ≥2 times.

[0009] As a preferred solution, the bidirectional alternating scraping is achieved by two sets of scraping knives, one set of scraping knives is used for scraping the inner side of the steel wire, and the other set of scraping knives is used for scraping the steel wire, and the two sets of scraping knives operate alternately.

[0010] As a preferred solution, two sets of scraping knives are used to perform bidirectional simultaneous scraping in the scraping process, one set of scraping knives is used to scrape the inner side of the steel wire, and the other set of scraping knives is used to scrape the steel wire, and the two sets of scraping knives operate simultaneously.

[0011] As a preferred embodiment, in the preparation of the wire rod, the chemical composition of the wire rod is: C: 0.04-0.07%, Si≤0.08%, Mn: 0.9-1.35%, P≤0.02%, S≤0.02%; the tensile strength of the wire rod is ≤450MPa; the cross-sectional shrinkage rate is ≥62%; the wire rod diameter is 6.5±0.30mm, the ovality is ≤0.48mm; the inclusions of type A and type C are both ≤2.0 level; the inclusions of type B and type D are both ≤1.5 level.

[0012] The advantages of the present invention are: compared with the traditional single-sided steel wool steel production process, the method of producing steel wool steel using a bidirectional scraping process has the following advantages:

[0013] (1) The present invention adopts a double-sided scraping process to symmetrically plan the inner and outer sides of the steel wire longitudinally, changing the contact mode between the steel wire and the crimping wheel from the traditional line contact to the surface contact, thereby reducing the vibration of the steel wire during the scraping process, thereby significantly reducing the abnormal wire breakage caused by the vibration of the steel wire during the scraping process; secondly, after adopting the double-sided scraping process, the cross-sectional shape of the remaining tail is a quasi-rectangular shape at the geometric center of the steel wire, and compared with the arc shape of the remaining tail of the traditional single-sided scraping, more of its outer surface is scraped off, thereby significantly reducing the number of abnormal wire breakage caused by scraping due to defects on the outer surface of the steel wire generated during the continuous cold drawing process; finally, the remaining cross-sectional area of ​​the remaining tail of the double-sided scraping is reduced from 61.42% to 1.3% of that of the traditional single-sided scraping. 2 Reduced to 50% 2 The theoretical utilization rate of scraping cotton wire increased from 80.44% to 84.08%, an increase of 3.64%.

[0014] (2) The present invention limits the number of times of scraping cotton, the depth of scraping cotton, the running speed of steel wire and the downward pressure of the scraping knife on the steel wire to coordinate the scraping cotton production efficiency and the wire breakage rate. In order to improve the production efficiency, the greater the scraping cotton depth, the better, the fewer times the scraping knife is adjusted, the better, the faster the scraping cotton speed, the better, and the greater the downward pressure of the scraping knife, the better. However, due to the existence of surface defects (cracks) of the steel wire, the selection of the above parameters needs to be appropriately adjusted according to the surface defects, otherwise it will cause wire breakage. The present invention adjusts the number of times of scraping cotton, the depth of scraping cotton, the running speed of steel wire and the downward pressure of the scraping knife on the steel wire according to the depth of the surface cracks of the steel wire, which can improve the production efficiency while reducing the wire breakage rate.

[0015] (3) The present invention adds a wire rod inspection process before the wire rod drawing process to limit the chemical composition, mechanical composition, diameter, inclusions and other parameters of the wire rod, thereby reducing the defects on the surface of the steel wire generated during the drawing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the one-way scraping method in the comparative example;

[0017] Figure 2 Schematic diagram of the cross-sectional shape of the tailings in the comparative example;

[0018] Figure 3 This is a flow chart of the cotton scraping process of Example 1;

[0019] Figure 4 This is a flow chart of the cotton scraping process of Example 2;

[0020] Figure 5 This is a flow chart of the cotton scraping process of Example 3;

[0021] Figure 6 This is a flow chart of the cotton scraping process of Examples 4 to 6;

[0022] Figure 7 It is a schematic diagram of the cross-sectional shape of the remaining tailings of Examples 1 to 6;

[0023] Steel wire 1, curling wheel 2, first cotton scraping knife 3, second cotton scraping knife 4, single-sided cotton scraping tail material 5, remaining tail material 6, steel wire radius r. DETAILED DESCRIPTION

[0024] In order to better understand the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0025] Comparative Example:

[0026] A method for producing steel-wool steel comprises the following steps:

[0027] (1) The chemical composition of the steel wool wire rod is as follows: C: 0.060%, Si: 0.049%, Mn: 1.22%, P: 0.011%, S: 0.008%; the finished product specification is φ6.34mm, the tensile strength is 426MPa, and the elongation is 78%;

[0028] (2) Drawing: The original hot-rolled wire rod of φ6.34 mm is subjected to 10 consecutive cold drawing passes to obtain a smooth steel wire of φ2.93 mm;

[0029] (3) Scraping cotton: combined Figure 1 As shown, the conventional one-way scraping is adopted, wherein the steel wires 1 are densely and evenly distributed in multiple rows on the crimping wheel 2, and the first scraping blade 3 scrapes the densely arranged steel wires 1, and the steel wires 1 are gradually consumed in the scraping process, as shown in FIG. Figure 2 As shown, the single-sided scraped cotton tail material 5 is arc-shaped, with a thickness d1 of r / 2, and a corresponding cross-sectional area of ​​about 61.42% r 2 The theoretical utilization rate of scraping wire is 80.44%.

[0030] In the comparative example, the steel wire vibrates greatly during the cotton scraping process, and the cracks generated on the inner side of the steel wire during the drawing process easily cause the steel wire to break. The incidence rate of wire breakage during the cotton scraping process (times / hundred tons) is 2.59%.

[0031] Embodiment 1:

[0032] A method for producing steel wool steel by using a bidirectional cotton scraping process comprises the following steps:

[0033] (1) Wire rod:

[0034] Chemical composition: C: 0.048%, Si: 0.025%, Mn: 1.25%, P: 0.010%, S: 0.009%;

[0035] Mechanical properties: Rm: 402MPa; Z: 85%;

[0036] Diameter: 6.69mm; Ovality: 0.22mm;

[0037] Inclusions: A1.0, B / , C1.0, D / ;

[0038] Surface quality: The surface of the wire rod shall not have defects that may endanger its use, such as scars, delamination, folds, ears, inclusions and cracks. The maximum depth of surface defects is 0.05mm.

[0039] (2) Wire rod pickling:

[0040] Remove the iron oxide on the surface to ensure that the steel wire has drawing conditions;

[0041] (3) Continuous cold drawing

[0042] The original hot-rolled wire rod of φ6.69mm was subjected to 10 continuous cold drawing passes to obtain a smooth steel wire of φ2.96 with an ovality of 0.06mm. Five cross sections were randomly selected within 2000mm of the head and tail of the steel wire coil for surface crack measurement, and the maximum surface crack depth was measured to be 138μm (the maximum surface crack depth is required to be ≤150μm. Steel wire with a surface crack depth exceeding 150μm does not meet the scraping conditions and is directly downgraded);

[0043] (4) Scraping cotton: combined Figure 3 As shown, a set of scraping knives is used to scrape cotton on both sides alternately. The inner side of the steel wire (the contact side of the crimping wheel) is scraped first. The maximum surface crack depth of this embodiment is 138 μm, between 120 and 150 μm. The specific operation of scraping cotton is as follows: Figure 3As shown, the first scraper 3 is placed on the inner side of the steel wire 1, and the inner side of the steel wire 1 is scraped to a depth of (3 / 8)r, then the first scraper 3 is moved to the outer side of the steel wire 1, and the outer side of the steel wire 1 is scraped to a depth of (3 / 8)r, then the first scraper 3 is moved to the inner side of the steel wire 1, and then the cotton is scraped in the following order: the inner side of the steel wire (1 / 4)r → the outer side of the steel wire is scraped to a depth of (1 / 4)r → the inner side of the steel wire is scraped to a depth of (1 / 4)r → the outer side of the steel wire is scraped to a depth of (1 / 4)r; the scraping speed is 35mm / s; the downward pressure of the scraper is 100N;

[0044] Combination Figure 7 As shown, the final remaining thickness (d2) of the remaining tailing 6 is r / 4, and the geometric center area of ​​the steel wire remains in the tailing, the center axis of the remaining tailing 6 coincides with the center axis of the steel wire 1, and the inner and outer planing surfaces of the remaining tailing 6 are both rectangular.

[0045] The present embodiment adopts a set of knives to scrape cotton alternately in two directions. Compared with the comparative example (traditional unidirectional scraping method), the contact mode between the steel wire 1 and the crimping wheel 2 is changed from the traditional line contact to the surface contact, which reduces the shaking of the steel wire 1 during the scraping process, thereby significantly reducing the abnormal wire breakage caused by the shaking of the steel wire during the scraping process; and after the bidirectional scraping is adopted, the cross-sectional shape of the remaining tail is a quasi-rectangular shape of the geometric center of the steel wire, and its outer surface is more scraped off compared with the arc shape of the remaining tail of the traditional single-sided scraping, so that the number of abnormal wire breakage caused by the scraping due to the outer surface defects of the steel wire generated during the continuous cold drawing process can be significantly reduced. The scraping wire breakage rate / (times / hundred tons) of the present embodiment is 0.52%; in addition, the remaining cross-sectional area of ​​the remaining tail of the double-sided scraping is reduced from 61.42% of the traditional single-sided scraping. 2 Reduced to 50% 2 , the theoretical utilization rate of scraping cotton wire increased from 80.44% to 83.92%.

[0046] Example 2

[0047] A method for producing steel wool steel by using a bidirectional cotton scraping process comprises the following steps:

[0048] (1) Wire rod inspection:

[0049] Chemical composition: C: 0.052%, Si: 0.063%, Mn: 1.16%, P: 0.009%, S: 0.014%;

[0050] Mechanical properties: Rm: 406MPa; Z: 83%;

[0051] Diameter: 6.6mm; Ovality: 0.30mm;

[0052] Inclusions: A / grade, B / grade, C1.0 grade, D / grade;

[0053] Surface quality: The surface of the wire rod shall not have defects that may endanger its use, such as scars, delamination, folds, ears, inclusions and cracks. The maximum depth of surface defects is 0.01mm.

[0054] (2) Wire rod pickling:

[0055] Remove the iron oxide on the surface to ensure that the steel wire has drawing conditions;

[0056] (3) Continuous cold drawing

[0057] The original hot-rolled wire rod is obtained by 8 consecutive cold drawing passes. The smooth steel wire has an ovality of 0.11mm. Five cross sections were randomly selected within 2000mm of the head and tail of the steel wire coil for surface crack measurement. The maximum surface crack depth was 110μm.

[0058] (4) Scraping cotton: combined Figure 4 As shown, it is achieved by a set of scraping knives, first scraping the inner side of the steel wire (the contact side of the crimping wheel): the maximum surface crack depth of this embodiment is 110μm, which is less than 120μm; the specific operation of scraping cotton is: combined with Figure 4 As shown, the first scraper 3 is placed inside the steel wire 1, and the scraper is scraped in the following order: inside the steel wire (1 / 2)r → outside the steel wire scraping (1 / 2)r depth → inside the steel wire (3 / 8)r depth → outside the steel wire scraping (3 / 8)r depth; the scraping speed is 45mm / s; the downward pressure of the scraper is 125N;

[0059] Combination Figure 7 As shown, the final remaining thickness (d2) of the remaining tailings 6 is r / 4, and the geometric center area of ​​the steel wire is retained in the tailings, the central axis of the remaining tailings 6 coincides with the central axis of the steel wire 1, and the inner and outer planed surfaces of the remaining tailings 6 are both rectangular. The scraping wire breakage rate / (times / hundred tons) of this embodiment is 0.60%; in addition, the utilization rate of the scraping wire is 84.01%.

[0060] Compared with Example 1, this embodiment is adjusted according to the maximum surface crack depth of the steel wire. The maximum surface crack depth of this embodiment is 110 μm. The number of scraping times is less than that of Example 1, the scraping speed is fast, and the downward pressure is large.

[0061] Example 3

[0062] A method for producing steel wool steel by using a bidirectional cotton scraping process comprises the following steps:

[0063] (1) Wire rod inspection:

[0064] Chemical composition: C: 0.061%, Si: 0.043%, Mn: 0.99%, P: 0.012%, S: 0.008%;

[0065] Mechanical properties: Rm: 435MPa; Z: 75%;

[0066] Diameter: 6.71mm; Ovality: 0.19mm;

[0067] Inclusions: A1.0, B / , C / , D1.0;

[0068] Surface quality: The surface of the wire rod shall not have defects that may endanger its use, such as scars, delamination, folds, ears, inclusions and cracks. The maximum depth of surface defects is 0.01mm.

[0069] (2) Wire rod pickling:

[0070] Remove the iron oxide on the surface to ensure that the steel wire has drawing conditions;

[0071] (3) Continuous cold drawing

[0072] The original hot-rolled wire rod is obtained by 9 consecutive cold drawing The smooth steel wire has an ovality of 0.09mm. Five cross sections were randomly selected within 2000mm of the head and tail of the steel wire coil for surface crack measurement. The maximum surface crack depth was 110μm.

[0073] (4) Scraping cotton: combined Figure 5 As shown, it is achieved by two sets of scraping knives, and the two sets of scraping knives (the first scraping knives 3 and the second scraping knives 4) perform scraping operations in the following order (the two sets of scraping knives operate alternately): the maximum surface crack depth of this embodiment is 110μm, which is less than 120μm; the specific operation of scraping cotton is: combined with Figure 5 As shown, the first scraper 3 scrapes the inner side of the steel wire (1 / 2) r → the second scraper 4 scrapes the outer side of the steel wire (1 / 2) r depth → the first scraper 3 scrapes the inner side of the steel wire (3 / 8) r depth → the second scraper 4 scrapes the outer side of the steel wire (3 / 8) r depth; the scraping speed is 42 mm / s; the downward pressure of the scraper is 115 N.

[0074] Combination Figure 7 As shown, the final remaining thickness (d2) of the remaining tailings 6 is r / 4, and the geometric center area of ​​the steel wire is retained in the tailings, the central axis of the remaining tailings 6 coincides with the central axis of the steel wire 1, and the inner and outer planed surfaces of the remaining tailings 6 are both rectangular. The scraping wire breakage rate / (times / hundred tons) of this embodiment is 0.55%; in addition, the utilization rate of the scraping wire is 82.95%.

[0075] This embodiment adopts two sets of scraping knives to scrape cotton alternately in two directions. Compared with Embodiment 3, Embodiment 3 needs to spend a lot of time and energy to continuously switch the position of the knives. This embodiment can significantly improve the efficiency of scraping cotton by adding a set of knives.

[0076] Example 4

[0077] A method for producing steel wool steel by using a bidirectional cotton scraping process comprises the following steps:

[0078] (1) Wire rod inspection:

[0079] Chemical composition: C: 0.057%, Si: 0.034%, Mn: 1.31%, P: 0.016%, S: 0.007%;

[0080] Mechanical properties: Rm: 415MPa; Z: 80%;

[0081] Diameter: 6.41mm; Ovality: 0.26mm;

[0082] Inclusions: A0.5, B / , C1.0, D / ;

[0083] Surface quality: The surface of the wire rod shall not have defects that may endanger its use, such as scars, delamination, folds, ears, inclusions and cracks. The maximum depth of surface defects is 0.008mm.

[0084] (2) Wire rod pickling:

[0085] Remove the iron oxide on the surface to ensure that the steel wire has drawing conditions;

[0086] (3) Continuous cold drawing

[0087] The original hot-rolled wire rod is obtained by 10 consecutive cold drawing passes. The smooth steel wire has an ovality of 0.12mm. Five cross sections were randomly selected within 2000mm of the head and tail of the steel wire coil for surface crack measurement. The maximum surface crack depth was 98μm.

[0088] (4) Scraping cotton: combined Figure 6 As shown, it is achieved by two sets of scraping knives, and the two sets of scraping knives scrape the inner and outer sides of the steel wire at the same time (the first scraping knives 3 and the second scraping knives 4 run at the same time). The scraping depth of each time is appropriately adjusted according to the surface defects of the steel wire. The maximum surface crack depth of this embodiment is 98μm, and the order is (1 / 2)r for the inner and outer sides → (3 / 8)r for the inner and outer sides; it is ensured that the final single-side scraping depth does not exceed (7 / 8)r, the scraping speed is 40mm / s, and the downward pressure of the scraping knives on the steel wire is 110N; combined with Figure 7As shown, the final remaining thickness (d2) of the remaining tailing 6 is r / 4, and the geometric center area of ​​the steel wire remains in the tailing, the center axis of the remaining tailing 6 coincides with the center axis of the steel wire 1, and the inner and outer planing surfaces of the remaining tailing 6 are both rectangular.

[0089] The scraping wire breakage rate / (times / hundred tons) of the present embodiment is 0.43%; in addition, the utilization rate of the scraping wire is 83.56%.

[0090] This embodiment adopts a method of scraping cotton in two directions at the same time with two sets of scraping knives. Since the wire rod will inevitably produce surface scratches or cracks in the process of drawing it to the steel wire, and the defect direction is random and not fixed, the scraping direction and depth of the scraping cotton can be adjusted at any time according to the direction and depth of the surface defects of the steel wire, ensuring that the defects on the surface of the steel wire are scraped off in time, and the steel wire is not easy to break during the scraping process. Compared with Example 3, the efficiency of scraping cotton alternately in two directions is low, and only one set of knives scrapes cotton on one side of the steel wire each time, and the steel wire is easily broken by the downward pressure on one side.

[0091] Example 5

[0092] A method for producing steel wool steel by using a bidirectional cotton scraping process comprises the following steps:

[0093] (1) Wire rod inspection:

[0094] Chemical composition: C: 0.040%, Si: 0.08%, Mn: 1.35%, P: 0.020%, S: 0.020%;

[0095] Mechanical properties: Rm: 450MPa; Z: 62%;

[0096] Diameter: 6.80mm; Ovality: 0.48mm;

[0097] Inclusions: A2.0, B1.0, C2.0, D1.5;

[0098] Surface quality: The surface of the wire rod shall not have defects that may endanger its use, such as scars, delamination, folds, ears, inclusions and cracks. The maximum depth of surface defects is 0.15mm.

[0099] (2) Wire rod pickling:

[0100] Remove the iron oxide on the surface to ensure that the steel wire has drawing conditions;

[0101] (3) Continuous cold drawing

[0102] The original hot-rolled wire rod is obtained by 10 consecutive cold drawing passes. The smooth steel wire has an ovality of 0.20 mm. Five cross sections were randomly selected within 2000 mm from the head and tail of the steel wire coil for surface crack measurement, and the maximum surface crack depth was 57 μm.

[0103] (4) Scraping cotton: combined Figure 6 As shown, it is achieved by two sets of scraping knives, and the two sets of scraping knives scrape the inner and outer sides of the steel wire at the same time (the first scraping knife 3 and the second scraping knife 4 operate simultaneously). The scraping depth of each time is appropriately adjusted according to the surface defects of the steel wire. The maximum surface crack depth of this embodiment is 57μm, and the order is (5 / 8)r for the inner and outer sides → (1 / 4)r for the inner and outer sides; it is ensured that the final single-side scraping depth does not exceed (7 / 8)r, the scraping speed is 50mm / s, and the downward pressure of the scraping knife on the steel wire is 130N; combined with Figure 7 As shown, the final remaining thickness (d2) of the remaining tailing 6 is r / 4, and the geometric center area of ​​the steel wire remains in the tailing, the center axis of the remaining tailing 6 coincides with the center axis of the steel wire 1, and the inner and outer planing surfaces of the remaining tailing 6 are both rectangular.

[0104] The scraping wire breakage rate / (times / hundred tons) of the present embodiment is 0.48%; in addition, the utilization rate of the scraping wire is 82.8%.

[0105] Example 6

[0106] A method for producing steel wool steel by using a bidirectional cotton scraping process comprises the following steps:

[0107] (1) Wire rod inspection:

[0108] Chemical composition: C: 0.07%, Si: 0.07%, Mn: 0.90%, P: 0.011%, S: 0.004%;

[0109] Mechanical properties: Rm: 412MPa; Z: 75%;

[0110] Diameter: 6.20mm; Ovality: 0.34mm;

[0111] Inclusions: A1.5, B1.5, C1.5, D1.0;

[0112] Surface quality: The surface of the wire rod shall not have defects that may endanger its use, such as scars, delamination, folds, ears, inclusions and cracks. The maximum depth of surface defects is 0.11mm.

[0113] (2) Wire rod pickling:

[0114] Remove the iron oxide on the surface to ensure that the steel wire has drawing conditions;

[0115] (3) Continuous cold drawing

[0116] The original hot-rolled wire rod is obtained by 8 consecutive cold drawing passes. The smooth steel wire has an ovality of 0.13mm. Five cross sections were randomly selected within 2000mm of the head and tail of the steel wire coil for surface crack measurement, and the maximum surface crack depth was measured to be 78μm.

[0117] (4) Scraping cotton: combined Figure 6 As shown, it is achieved by two sets of scraping knives, and the two sets of scraping knives scrape the inner and outer sides of the steel wire at the same time (the first scraping knife 3 and the second scraping knife 4 operate simultaneously). The scraping depth of each time is appropriately adjusted according to the surface defects of the steel wire. The maximum surface crack depth of this embodiment is 78μm, and the order is (3 / 8)r for the inner and outer sides → (1 / 2)r for the inner and outer sides; it is ensured that the final single-side scraping depth does not exceed (7 / 8)r, the scraping speed is 48mm / s, and the downward pressure of the scraping knife on the steel wire is 128N; combined with Figure 7 As shown, the final remaining thickness (d2) of the remaining tailing 6 is r / 4, and the geometric center area of ​​the steel wire remains in the tailing, the center axis of the remaining tailing 6 coincides with the center axis of the steel wire 1, and the inner and outer planing surfaces of the remaining tailing 6 are both rectangular.

[0118] The scraping wire breakage rate / (times / hundred tons) of the present embodiment is 0.52%; in addition, the utilization rate of the scraping wire is 82.1%.

Claims

1. A method for producing steel wool steel by using a bidirectional scraping process, including wire rod inspection, drawing, crack measurement, and scraping steps; after the wire rod is drawn, a steel wire is obtained, the crack depth on the steel wire is measured, and the steel wire with a crack depth less than 150 μm is selected, and the steel wire is wound on a steel wire winding wheel and scraped by a scraping knife, and the scraped steel wool steel is collected as a raw material for the production of steel wool, and the remaining tailings are recycled as scrap steel; characterized in that, The cotton scraping process is as follows: the cotton scraping knife adopts a two-way alternating cotton scraping method or a two-way simultaneous cotton scraping method to perform symmetrical longitudinal planing on the inner side and the outer side of the steel wire. The depth of the cotton scraping knife scraping the inner side of the steel wire in a single time is the same as the depth of the cotton scraping knife scraping the outer side of the steel wire in the corresponding time. The cumulative cotton scraping depth of the inner side or the outer side of the steel wire is 7 / 8 of the radius of the steel wire, the thickness of the remaining tailings is 1 / 4 of the radius of the steel wire, the central axis of the remaining tailings coincides with the central axis of the steel wire, and the inner planing surface and the outer planing surface of the steel wire after the remaining tailings are both rectangular.

2. The method for producing steel wool steel using a bidirectional scraping process according to claim 1, characterized in that: In the cotton scraping process, the running speed of the steel wire is 30-50 mm / s; the downward pressure of the cotton scraping knife on the steel wire is 90-130N.

3. The method for producing steel wool steel using a bidirectional scraping process according to claim 2 is characterized in that: When the crack depth is 120μm≤and <150μm, the running speed of the steel wire in the scraping process is 30-40mm / s, and the downward pressure of the scraper on the steel wire is 90-110N; when the crack depth is <120μm, the running speed of the steel wire in the scraping process is 40-50mm / s, and the downward pressure of the scraper on the steel wire is 110-130N.

4. The method for producing steel wool steel using a bidirectional scraping process according to claim 1, characterized in that: In the scraping process, the scraper knife adopts a bidirectional alternating scraping method. Specifically, the scraper knife first planes the inner side of the steel wire, and then planes the outer side of the steel wire after the inner side of the steel wire is planed. Then, the scraping knife planes alternately in the order of first the inner side of the steel wire and then the outer side of the steel wire. When the crack depth is 120μm≤<150μm, the scraper knife direction is adjusted ≥4 times; when the crack depth is <120μm, the scraper knife direction is adjusted ≥2 times.

5. The method for producing steel wool steel by using a bidirectional cotton scraping process according to claim 4 is characterized in that: The two-way alternating scraping is achieved by two sets of scraping knives, one set of scraping knives is used for scraping the inner side of the steel wire, and the other set of scraping knives is used for scraping the steel wire, and the two sets of scraping knives operate alternately.

6. The method for producing steel wool steel using a bidirectional scraping process according to claim 1, characterized in that: In the scraping process, two sets of scraping knives are used for bidirectional simultaneous scraping. One set of scraping knives is used to scrape the inner side of the steel wire, and the other set of scraping knives is used to scrape the steel wire. The two sets of scraping knives operate simultaneously.

7. The method for producing steel wool steel using a bidirectional scraping process according to any one of claim 1, characterized in that: In the preparation of the wire rod, the chemical composition of the wire rod is: C: 0.04-0.07%, Si≤0.08%, Mn: 0.9-1.35%, P≤0.02%, S≤0.02%; the tensile strength of the wire rod is ≤450MPa; the cross-sectional shrinkage rate is ≥62%; the wire rod diameter is 6.5±0.30mm, the ovality is ≤0.48mm; the inclusions of type A and type C are both ≤2.0 level; the inclusions of type B and type D are both ≤1.5 level.

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