CN112934955A - Spring steel wire rod production method for reducing false alarm rate of eddy current flaw detection - Google Patents
Spring steel wire rod production method for reducing false alarm rate of eddy current flaw detection Download PDFInfo
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- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 181
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000004513 sizing Methods 0.000 claims abstract description 13
- 238000009987 spinning Methods 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 10
- 230000003746 surface roughness Effects 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a spring steel wire rod production method for reducing the false alarm rate of eddy current flaw detection, wherein a steel billet is heated and descaled and then is rolled at 950-1000 ℃, then the billet passes through a first rolling mill to a sixth rolling mill at 920-970 ℃, a seventh rolling mill to a fourteenth rolling mill at 890-940 ℃, a fifteenth rolling mill to an eighteenth rolling mill of a pre-finishing mill group at 880-930 ℃, the temperature of the billet is reduced through a first water tank and a second water tank, the billet passes through a nineteenth rolling mill to a twenty-second rolling mill of a reducing sizing mill group at 820-870 ℃, the temperature of the billet is reduced through a third water tank, and the wire rod spinning temperature is 850-900 ℃. The size positive tolerance and the out-of-roundness of the finished spring steel wire rod are ensured by controlling the billet heating temperature uniformity, the rolling tension of rough rolling and medium rolling and the sleeve lifting height of the loop, so that the diameter reduction and rounding effects of the spring steel wire rod are ensured, the ovality and the roughness of the spring steel wire are reduced, and the false alarm rate in the eddy current flaw detection process is reduced.
Description
Technical Field
The invention belongs to the technical field of steel rolling, relates to a production method of a spring steel wire rod, and particularly relates to a production method of a spring steel wire rod for reducing the false alarm rate of eddy current flaw detection.
Background
The automobile suspension spring is an elastic element in an automobile suspension, so that an axle and a frame or an automobile body are in elastic connection, vertical load is borne and transmitted, and impact caused by an uneven road surface is relieved and restrained. Therefore, the automotive suspension spring needs to bear the impact load for a long time, high yield strength and fatigue resistance are required, and the suspension spring needs to be subjected to a high-pressure test and a fatigue test and is extremely sensitive to surface damage.
Spring steel wire manufacture factory has extremely high requirements for surface quality of spring steel wire rods for producing automobile suspension springs, and needs to carry out eddy current flaw detection on spring steel wires before producing oil quenching steel wires, and the eddy current flaw detection process flow of the spring steel wire manufacture factory is as follows: wire rod → shot blasting → 0.3mm reducing circle drawing → eddy current testing → defect painting → defect grinding.
The eddy current flaw detection precision is 0.05mm, if the coil rod diameter reduction and rounding effect is poor or the surface of the coil rod is too rough, the ovality or roughness of the spring steel wire subjected to diameter reduction and rounding drawing exceeds the eddy current flaw detection precision, the false alarm in the eddy current flaw detection process can be caused, the operation rate is reduced, and great trouble is brought to production.
Disclosure of Invention
The invention aims to solve the problems and provides a spring steel wire rod production method for reducing the false alarm rate of eddy current flaw detection, which ensures the dimensional tolerance and the out-of-roundness of a finished spring steel wire rod by controlling the heating temperature uniformity of a steel billet, the rolling tension of rough rolling and medium rolling and the sleeve lifting height of a loop, and ensures the surface roughness of the spring steel wire rod by checking the surface roughness of a rolling groove of a roll collar and timely replacing the roll collar, thereby ensuring the diameter reduction and rounding effects of the spring steel wire rod (reducing the ovality and the roughness of the spring steel wire) and reducing the false alarm rate in the eddy current flaw detection process.
In order to achieve the technical purpose, the invention provides a spring steel wire rod production method for reducing the false alarm rate of eddy current flaw detection, which comprises the following steps in sequence: heating a steel billet → roughly rolling a rough rolling unit consisting of first to sixth rolling mills → roughly rolling a middle rolling unit consisting of seventh to fourteenth rolling mills → preliminarily rolling a preliminary finishing rolling unit consisting of fifteenth to eighteenth rolling mills → reducing and sizing rolling a reducing and sizing mill unit consisting of nineteenth to twenty second rolling mills → laying wire and looping, which are as follows:
(1) the billet is heated, descaled, rolled at 950 to 1000 ℃ and bitten into the first rolling mill by means of pinch rolls.
Further, the opening degrees of the gas and air flow booster pumps of the heating furnace in the step (1) are controlled to be 60-100%, the gas pressure is ensured to reach more than 15kPa, the length of the jet flame is not less than 4m, the uniformity of the temperature of the heating furnace is ensured, and the temperature difference between the furnace wall and the furnace top is controlled within 20 ℃, so that the uniformity of the temperature of the head, the middle and the tail of the billet is ensured. The temperature uniformity of the billet is controlled, so that the stability of the subsequent rolling tension is facilitated, and the stable sizes of the head, the middle and the tail of the wire rod are ensured.
(2) Then the blank is roughly rolled by first to sixth rolling mills in turn at 920 to 970 ℃, and the blank reaches a seventh rolling mill after passing through a first flying shear cutting head.
Further, the rough rolling in the step (2) is realized by adjusting the rotating speed of each rolling mill in a cascade way, and the tension between each front rolling mill and each rear rolling mill is required to be controlled within-0.3 to +0.3MPa, so that the micro-tension rolling is realized, and the stable feeding size is provided for the subsequent pre-finish rolling.
(3) And then the blank is sequentially rolled in seventh to fourteenth rolling mills at 890-940 ℃, and the blank reaches a pre-finishing mill group after being cut by a second flying shear.
Further, the seventh rolling mill to the thirteenth rolling mill in the step (3) adjust the rotating speed of each rolling mill in a cascade mode, the tension between each front rolling mill and each rear rolling mill needs to be controlled within-0.5 to +0.5MPa, micro-tension rolling is achieved, and therefore stable incoming material size is provided for subsequent pre-finish rolling; the initial height of a first loop between the thirteenth rolling mill and the fourteenth rolling mill is set to be 11-15 cm, so that zero-tension rolling is conveniently realized through automatically adjusting the loop amount, and the stability of the material shape and size is ensured.
(4) And then the blank is subjected to pre-finish rolling by a fifteenth rolling mill to an eighteenth rolling mill in sequence at 880-930 ℃, is cooled by a first water tank and a second water tank, and reaches a reducing sizing mill set after being subjected to third flying shear and head cutting.
Further, the initial height of a second loop between the fourteenth rolling mill and the fifteenth rolling mill in the steps (3) and (4) is set to be 18-22 cm, so that zero-tension rolling can be realized through automatically adjusting the loop amount in the following process, and the stability of the material shape and size is ensured.
Further, the initial height of a third loop between the fifteenth rolling mill and the sixteenth rolling mill in the step (4) is set to be 13-17 cm, and the initial height of a fourth loop between the sixteenth rolling mill and the seventeenth rolling mill is set to be 15-19 cm, so that zero-tension rolling can be realized through automatically adjusting the loop amount in the follow-up process, and the stability of the material shape and size can be ensured.
(5) Then the blank is sequentially subjected to size reduction rolling by a nineteenth rolling mill to a twenty-second rolling mill at 820-870 ℃, the temperature is reduced by a third water tank, and the spinning temperature of the wire rod is controlled at 850-900 ℃.
Further, the initial height of a fifth loop between the eighteenth rolling mill and the nineteenth rolling mill in the steps (4) and (5) is set to be 14-18 cm, so that zero-tension rolling can be realized through automatic adjustment of the loop amount in the following process, the stability of the material shape and the size is ensured, and finally the spring steel wire rod with the dimensional tolerance and the out-of-roundness meeting the requirements is obtained.
Further, rated excessiveness of the nineteenth rolling mill roll collar and the twentieth rolling mill roll collar of the reducing sizing mill set in the step (5) is 800t, rated excessiveness of the twenty-first rolling mill roll collar and the twenty-second rolling mill roll collar is 500t, and roll collar groove roughness Ra is not more than 32 mu m; if the roughness Ra of the roll ring groove is found to exceed 32 mu m in the inspection process, the roll ring of the rolling mill should be replaced in time even if the rated steel passing amount of the roll ring is not reached, thereby ensuring the smooth surface of the spring steel wire rod.
The spring steel wire rod obtained by the invention comprises the following chemical components in percentage by mass: 0.51 to 0.59%, Si: 1.20 to 1.60%, Mn: 0.50 to 0.80%, Cr: 0.50 to 0.80 percent of Ni, less than or equal to 0.35 percent of Ni, less than or equal to 0.25 percent of Cu, less than or equal to 0.025 percent of Al, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, and the balance of iron and inevitable impurities.
The invention controls the gas jet length by controlling the opening degrees of the gas and air booster pumps, thereby ensuring the flame length to ensure that the heating temperature of the billet is uniform and providing favorable conditions for the stable control of the subsequent full-flow rolling tension; the rolling tension of rough rolling and medium rolling and the sleeve lifting height of a loop are monitored, and cascade adjustment is performed in time to enable the rolling tension to meet the requirements, so that the stable control of the dimensional tolerance and the out-of-roundness of the finished spring steel wire rod is realized. The measures can effectively ensure the diameter reduction and rounding effects of the spring steel wire rod of follow-up spring steel wire manufacturers, reduce the ovality and the roughness of the spring steel wire and reduce the false alarm rate in the eddy current flaw detection process.
The invention has the beneficial effects that: the spring steel wire rod produced by the invention can ensure that the dimensional tolerance range is 0-0.20 mm, the out-of-roundness is less than or equal to 0.15mm, the surface of the wire rod is smooth, the reducing and rounding effects of the spring steel wire rod of spring steel wire manufacturers are met, and the false alarm rate in the eddy current flaw detection process is effectively reduced.
Drawings
FIG. 1 is a schematic structural diagram of a rolling line used in the method for producing a spring steel wire rod for reducing the false alarm rate of eddy current flaw detection in the embodiment of the invention.
1. High-pressure water dephosphorization, 2, a first pinch roll, 3, a first rolling mill, 4, a second rolling mill, 5, a third rolling mill, 6, a fourth rolling mill, 7, a fifth rolling mill, 8, a sixth rolling mill, 9, a first flying shear, 10, a seventh rolling mill, 11, an eighth rolling mill, 12, a ninth rolling mill, 13, a tenth rolling mill, 14, an eleventh rolling mill, 15, a twelfth rolling mill, 16, a thirteenth rolling mill, 17, a first loop, 18, a fourteenth rolling mill, 19, a second flying shear, 20, a second loop, 21, a fifteenth rolling mill, 22, a third loop, 23, a sixteenth rolling mill, 24, a fourth loop, 25, a seventeenth rolling mill, 26, an eighteenth rolling mill, 27, a first water tank, 28, a second water tank, 29, a second pinch roll, 30, a third flying shear, 31, a breaking shear, 32, a fifth loop, 33, a third water tank, 34, a fourth water tank, 35, a fifth water tank, 36. sixth water box, 37 seventh water box, 38 third pinch roll, 39 laying head.
Detailed Description
The invention combines the chemical components C of the steel billet: 0.55%, Si: 1.42%, Mn: 0.68%, Cr: 0.71%, Ni: 0.09%, Cu: 0.07%, Al: 0.05%, P: 0.008%, S: 0.004 percent, and the production implementation of the finished product specification phi 16.0mm of spring steel wire rod is explained.
Example 1
1. Heating of steel billets
The opening degrees of a gas and air flow booster pump of the heating furnace are both 80 percent, the gas pressure reaches 18kPa, the length of the jet flame is 5m, the temperature difference between the furnace wall and the furnace top is controlled within 15 ℃, the billet is heated and descaled and then is rolled at 980-1000 ℃, and is bitten into a first rolling mill by a pinch roll.
2. Rough rolling
Then the blank passes through a first rolling mill to a sixth rolling mill at 950-970 ℃, the rotating speed of each rolling mill is adjusted in a cascading way, the rough rolling ensures that the tension between each front rolling mill and each rear rolling mill is controlled within-0.3-plus 0.3MPa, and the blank reaches a seventh rolling mill after passing through a first flying shear head.
3. Medium rolling
And then the blank passes through a seventh rolling mill to a fourteenth rolling mill at the temperature of 920-940 ℃, the rotating speed of each rolling mill is adjusted in a cascade mode, the seventh rolling mill to the thirteenth rolling mill ensure that the tension between the front rolling mill and the rear rolling mill is controlled within-0.5-plus 0.5MPa, the initial height of a first loop between the thirteenth rolling mill and the fourteenth rolling mill is set to be 13cm, and the blank reaches a pre-finishing mill group after being cut by a second flying shear.
4. Pre-finish rolling
And then the blank passes through fifteenth to eighteenth rolling mills of a pre-finishing mill group at 910 to 930 ℃, the initial height of a second loop between the fourteenth rolling mill and the fifteenth rolling mill is set to be 20cm, the initial height of a third loop between the fifteenth rolling mill and the sixteenth rolling mill is set to be 15cm, the initial height of a fourth loop between the sixteenth rolling mill and the seventeenth rolling mill is set to be 17cm, the temperature is reduced through a first water tank and a second water tank, and the blank reaches a reducing and sizing mill group after being cut by a third flying shear.
5. Reducing diameter rolling
Then the blank passes through nineteenth to twenty-second rolling mills of a reducing and sizing mill set at 850-870 ℃, the initial height of a fifth loop between the eighteenth rolling mill and the nineteenth rolling mill is set to be 14-18 cm, the rated steel passing amounts of roll rings of the nineteenth and the twentieth rolling mills of the reducing and sizing mill set are 800t, the rated steel passing amounts of the roll rings of the twenty-first and the twenty-second rolling mills are 500t, and the roughness Ra of a rolling groove of the roll ring is not more than 32 mu m; if the roughness Ra of the roll collar groove is found to exceed 32 mu m in the inspection process, the roll collar of the rolling mill should be replaced in time even if the rated steel passing amount of the roll collar is not reached.
6. Laying-out loop-forming
And (4) cooling the steel wire rod by a third water tank after reducing diameter and finishing rolling, and controlling the spinning temperature of the steel wire rod to be 880-900 ℃.
Example 2
Example 2 compared with example 1, the billet is heated, descaled, then rolled at 950 to 970 ℃, the billet is passed through the first to sixth rough rolling mills at 920 to 940 ℃, the seventh to fourteenth medium rolling mills at 890 to 910 ℃, the fifth, fifteenth to eighteenth pre-finishing mill group at 880 to 900 ℃, the nineteenth to twenty second reducing mill group at 830 to 850 ℃, the spinning temperature of the wire rod is controlled at 860 to 880 ℃, and the other operations are the same as example 1.
Comparative example 1
Comparative example 1 differs from example 1 mainly in that: the gas and air flow booster pump opening degree in step 1 of example 1 is replaced by 40% at 80%, and other conditions are the same as in example 1.
The opening of the gas and air flow booster pump is reduced by half, the gas pressure can only reach 12kPa, the length of the jet flame can only reach 3.5m, the temperature difference between the furnace wall and the furnace top reaches 35 ℃, and the control ranges of the subsequent rolling temperature and the rolling tension cannot meet the target requirements.
Comparative example 2
Comparative example 2 differs from example 1 mainly in that: the tension control range between the two rolling mills before and after rough rolling in step 2 of example 1 is widened from-0.3 to +0.3MPa to-0.6 to +0.6MPa, and the other conditions are the same as those in example 1.
Comparative example 3
Comparative example 3 compared to example 1, the main differences are: the tension control range between the front and rear two rolling mills of the seventh to thirteenth rolling mills in step 3 of example 1 is widened from-0.5 to +0.5MPa to-1.0 to +1.0MPa, and the other conditions are the same as those of example 1.
Comparative example 4
Comparative example 4 compared to example 1, the main differences are: the rated excessive steel amount of the roll rings of the nineteenth rolling mill and the twentieth rolling mill of the reducing and sizing mill group in the step 5 of the embodiment 1 is widened to 1200t, the rated excessive steel amount of the roll rings of the twenty-first rolling mill and the twenty-second rolling mill is widened to 800t, the groove roughness Ra of the roll rings is widened to 64 mu m, and other conditions are the same as the embodiment 1.
The dimensional tolerance, out-of-roundness and drawn wire ovality, surface roughness and false flaw detection rate of the spring steel wire rods produced in examples 1, 2, 3 and 4 of the present invention are shown in table 1.
TABLE 1 spring steel wire rod dimensional tolerance, out-of-roundness and drawn wire ovality, surface roughness, false flaw detection rate results
The spring steel wire rod obtained by the embodiment of the invention can ensure that the range of the dimensional tolerance is 0-0.20 mm, the out-of-roundness is less than or equal to 0.15mm, the surface of the wire rod is smooth, and the spring steel wire rods obtained by the comparative examples have the problems of different degrees, or the dimensional tolerance and the out-of-roundness are too large, or the surface smoothness of the wire rod is not enough. Therefore, the spring steel wire rod produced by the embodiment can meet the reducing and rounding effects of the spring steel wire rod of spring steel wire manufacturers, the false alarm rate in the eddy current flaw detection process is extremely low, and the spring steel wire or the ovality or the surface roughness of the spring steel wire rod produced by the comparative example after being drawn exceeds the eddy current flaw detection precision by 0.05mm, so the false alarm rate in the eddy current flaw detection process is high.
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all modifications of the above embodiments made according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (5)
1. A production method of a spring steel wire rod for reducing the false alarm rate of eddy current flaw detection is characterized by comprising the following steps of: comprises the following steps which are carried out in sequence: heating a steel billet → roughly rolling a rough rolling unit consisting of first to sixth rolling mills → roughly rolling a middle rolling unit consisting of seventh to fourteenth rolling mills → preliminarily rolling a preliminary finishing rolling unit consisting of fifteenth to eighteenth rolling mills → reducing and sizing rolling a reducing and sizing mill unit consisting of nineteenth to twenty second rolling mills → laying wire and looping, which are as follows:
(1) the method comprises the following steps that a billet is heated by a heating furnace, the temperature difference between the wall and the top of the heating furnace is controlled within 20 ℃, then the billet is descaled and rolled at 950-1000 ℃, and the billet is bitten into a first rolling mill by a pinch roll;
(2) then the blank is subjected to rough rolling by first to sixth rolling mills in turn at 920 to 970 ℃, the blank reaches a seventh rolling mill after passing through a first flying shear cutting head, and the tension between the front rolling mill and the rear rolling mill of the rough rolling mill set is controlled within-0.3 to +0.3 MPa;
(3) then the blank is sequentially rolled in seventh to fourteenth rolling mills at 890 to 940 ℃, the blank reaches a pre-finishing mill group after passing through a second flying shear cutting head, the tension between the front and rear rolling mills in the seventh to thirteenth rolling mills is controlled within-0.5 to +0.5MPa, and the initial height of a first loop between the thirteenth rolling mill and the fourteenth rolling mill is set to be 11 to 15 cm;
(4) then, the blank is sequentially rolled by fifteenth to eighteenth rolling mills of a pre-finishing mill group at 880-930 ℃, cooled by a first water tank and a second water tank, and then is cut by a third flying shear to reach a reducing and sizing mill group, the initial height of a second loop between the fourteenth rolling mill and the fifteenth rolling mill is set to be 18-22 cm, the initial height of a third loop between the fifteenth rolling mill and the sixteenth rolling mill is set to be 13-17 cm, and the initial height of a fourth loop between the sixteenth rolling mill and the seventeenth rolling mill is set to be 15-19 cm;
(5) then, sequentially reducing and diameter-rolling the blank by a nineteenth rolling mill to a twenty-second rolling mill at 820-870 ℃, cooling by a third water tank, controlling the spinning temperature of the wire rod to be 850-900 ℃, and setting the initial height of a fifth loop between an eighteenth rolling mill and the nineteenth rolling mill to be 14-18 cm;
and controlling the dimensional tolerance of the spring steel wire rod to be a positive tolerance.
2. The production method of the spring steel wire rod for reducing the false alarm rate of eddy current flaw detection according to claim 1, is characterized in that: and (5) rated excessive steel amounts of the nineteenth rolling mill roll collar and the twentieth rolling mill roll collar of the reducing sizing mill set are 800t, rated excessive steel amounts of the twenty-first rolling mill roll collar and the twenty-second rolling mill roll collar are 500t, and the roughness Ra of a roll collar groove is not more than 32 mu m.
3. The production method of the spring steel wire rod for reducing the false alarm rate of eddy current flaw detection according to claim 1, is characterized in that: the temperature difference control method of the furnace wall and the furnace top of the heating furnace comprises the following steps: the opening degrees of the gas and air flow booster pump of the heating furnace are controlled to be 60-100%, the gas pressure is ensured to reach more than 15kPa, and the length of the jet flame is not less than 4 m.
4. The production method of the spring steel wire rod for reducing the false alarm rate of eddy current flaw detection according to any one of claims 1 to 3, characterized by comprising the following steps of: the wire rod comprises the following chemical components in percentage by mass: 0.51 to 0.59%, Si: 1.20 to 1.60%, Mn: 0.50 to 0.80%, Cr: 0.50 to 0.80 percent of Ni, less than or equal to 0.35 percent of Ni, less than or equal to 0.25 percent of Cu, less than or equal to 0.025 percent of Al, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, and the balance of iron and inevitable impurities.
5. The production method of the spring steel wire rod for reducing the false alarm rate of eddy current flaw detection according to any one of claims 1 to 3, characterized by comprising the following steps of: the dimensional tolerance of the spring steel wire rod is 0-0.20 mm, and the out-of-roundness is less than or equal to 0.15 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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