CN1904088A - Method of implementing on line softening annealing of medium, high carbon steel wire using high energy electric pulse - Google Patents
Method of implementing on line softening annealing of medium, high carbon steel wire using high energy electric pulse Download PDFInfo
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- CN1904088A CN1904088A CN 200610061457 CN200610061457A CN1904088A CN 1904088 A CN1904088 A CN 1904088A CN 200610061457 CN200610061457 CN 200610061457 CN 200610061457 A CN200610061457 A CN 200610061457A CN 1904088 A CN1904088 A CN 1904088A
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Abstract
The present invention relates to an on-line continuous softening annealing method of medium-high carbon steel wire by utilizing high-energy electric pulse. Said method includes the following steps: utilizing decoiling equipment and winding-up equipment to drive steel wine and make it be moved towards the winding-up equipment at a certain speed; setting a high-energy pulse power supply, said high-energy pulse power supply can continuously output high-energy electric pulse and utilizing a pair of electrodes to apply the high-energy electric pulse to the moving steel wire so as to make the steel wire undergo the process of continuously softening annealing treatment.
Description
Technical field
The bullet wire, the high-carbon steel wire (comprising high carbon alloy steel wire, bearing steel wire etc.) that the present invention relates to work hardening carry out the softening annealing treatment technology, specifically be a kind of high energy electric pulse centering, high-carbon steel wire on-line continuous softening annealing process of utilizing, after the electricimpulse processing, finally can reach the performance index of the middle and high carbon steel wire of conventional annealing.
Background technology
High-carbon steel wire is widely used in tire to be strengthened with steel cord, bridge with galvanized steel wire, cold-drawn steel wire for prestressed concrete, piano wire, bearing silk, towards pin etc.; Bullet wire is used to welding wire, steel strand, wireline, spring etc., and two kinds of steel wires occupy critical role in industry.Middle and high carbon steel wire goods bear very big load, and working conditions is abominable, thereby the ideal steel wire should have higher intensity and plasticity preferably.The combination of suitable high strength and moderate high-ductility can make material and member obtain very high energy to fracture or work of rupture, thus the performance and the life-span of greatly improving engineering component.Generally needing to carry out softening annealing by heat treatment furnace after the present middle and high carbon steel wire work hardening handles.Yet softening annealing must have suitable Heating temperature, suitable soaking time and speed of cooling slowly.Produce at present and go up the softening annealing process that uses, heat treatment cycle is long, and production efficiency is low, handles the back steel wire and also will just can use through a series of flow processs such as surface treatments, and equipment and technology are all very complicated, and production cost is quite high.How to make middle and high carbon steel wire can satisfy the softening annealing performance index after treatment with simple technology, be the problem that engineering circle is paid special attention to.
Summary of the invention
The purpose of this invention is to provide a kind of middle and high carbon steel wire on-line continuous softening annealing treatment process that utilizes high energy electric pulse to work hardening, thereby replace the heat treatment furnace anneal operation of using at present, make middle and high carbon steel wire satisfy final softening annealing performance index simultaneously.
High energy electric pulse centering, the high-carbon steel wire of utilizing of the present invention carries out on-line continuous softening annealing method, takes following steps: drive steel wire by decoiling equipment and wrap-up and transmit to described wrap-up direction with certain speed; Dispose a high energy pulse power supply, this power supply is continuously exported high energy electric pulse, and the electric imposing region of the steel wire of by the pair of electrodes input motion carries out continuous softening annealing and handles.
According to middle and high carbon steel wire diameter and final performance requriements, in the anneal process, the processing parameter of the high energy pulse electric current of the steel wire electric imposing region that input motion can be pulse width 10～200 μ s, frequency 50～3000Hz, the amplitude 100～1500A/mm of current density
2Wherein, the optimizing technology parameters of described high energy pulse electric current is: pulse width 20～100 μ s, frequency 100～1500Hz, the amplitude 200～1500A/mm of current density
2
The present invention has compared following beneficial effect with the middle and high carbon steel wire technology of existing other conventional processing:
1. in electricimpulse softening annealing treating processes, produce certain joule heating effect and non-thermal effect in the middle and high carbon steel wire, because the coupling of joule heating effect and non-thermal effect, the atomic vibration energy is further sharply increased, the acceleration of climbing of dislocation, help in the material because of the formed subgrain of work hardening rotates, these factors have promoted ferritic recrystallize process.By microstructure analysis, observed cementite still is spherical in the high-carbon steel wire after electricimpulse is handled, and is evenly distributed in the ferrite matrix, does not find any flaky perlite.Be grey black fine pearlite and white ferritic structure in the medium carbon steel, distribute that crystal grain is tiny along crystal boundary.
2. the electricimpulse treatment time lacks, and treatment temp is low, so has reduced decarburization, the degree of oxidation of material in the treating processes.Thereby reduced the conventional processing technology because of elevated temperature and the long-time decarburization that is brought, the phenomenon of oxidation aggravation of being incubated.
3. after handling through electricimpulse, finally can satisfy the middle and high carbon steel wire performance index of annealing.
4. to have equipment simple for the electricimpulse treatment process, can replace the heat treatment furnace annealing operation of present use, and can realize the on-line continuous softening annealing, enhances productivity greatly.
5. the present invention is novel, is the middle and high carbon steel wire anneal of 0.05～6.5mm applicable to diameter, and it is low to have a production cost, the efficient height, energy consumption is low, and environment improves, middle and high carbon steel wire quality stability after the processing is good, can obtain the excellent comprehensive performance.
Description of drawings
Fig. 1 is a high energy electric pulse on-line continuous softening annealing treatment unit synoptic diagram;
Fig. 2 is the metallographic structure of GCr15 steel wire before work hardening;
Fig. 3 is the metallographic structure after the work hardening of same GCr15 drawn wire;
Fig. 4 is that same GCr15 drawn wire sclerosis is after the metallographic structure after the electricimpulse processing;
Fig. 5 is the metallographic structure after the 55 steel wire work hardening;
Fig. 6 is that same 55 steel wires sclerosis is after the metallographic structure after the electricimpulse processing.
Embodiment
With reference to Fig. 1, realize that the high energy electric pulse annealing treatment equipment of the inventive method comprises decoiling equipment 1, wrap-up 2, high energy pulse power supply 4, is arranged at the pair of electrodes 3,5 between decoiling equipment 1 and the wrap-up 2.Middle and high carbon steel wire 6 by open, wrap-up supports and tensioning, the tension adjustment mechanism that they have guarantees the stability of steel wire moving process.Open, the wrap-up energy of rotation drive steel wire with certain speed to described wrap-up 2 directions (Fig. 1 direction of arrow) transmission continuously, the transmission speed of steel wire can be 0.5～80m/min, transmission speed is by frequency transformer and torque motor adjustment control (not drawing among the figure), and is adjustable continuously in 0.5～80m/min scope.
The positive and negative output terminal of high energy pulse power supply 4 connects two electrodes 5,3 respectively, makes the electric imposing region of the middle and high carbon steel wire that high energy pulse electric current input motion carry out continuous softening annealing by these two electrodes and handles.The peak power output of high energy pulse power supply 4 is 15KW, and output pulse width can be 10～200 μ s, and output pulse frequency is 50～3000Hz.
Two electrodes 3,5 are two and adopt copper to cover the electrode briquetting that nickel dam is made that upper and lower electrode briquetting and middle and high carbon steel wire contact position are provided for holding the groove of steel wire, and be good to guarantee contact, reduces contact resistance.Two distance between electrodes are adjustable in 80～400mm scope, and according to required processing speed adjustment, speed is fast more during use, and two distance between electrodes should extend.Electrode also can adopt the better and attrition resistant materials of electroconductibility such as copper-graphite, dispersion-strengthened Cu or brass to make.
By equipment shown in Figure 1, middle and high carbon steel wire on-line continuous softening annealing process is as follows:
Drive middle and high carbon steel wire 6 by decoiling equipment 1 shown in Figure 1, wrap-up 2 and transmit to described wrap-up 2 directions with certain speed, the transmission speed of steel wire can be adjusted in 0.5～80m/min scope as required.
The electric imposing region of the middle and high carbon steel wire 6 that the high energy pulse electric current of described high energy pulse power supply 4 by electrode 3,5 input motions carries out continuous softening annealing to be handled.The processing parameter of the high energy pulse electric current of the electric imposing region of the steel wire of input motion is during processing: pulse width 10～200 μ s, frequency 50～3000Hz, the amplitude 100～1500A/mm of current density
2The processing parameter of preferred high energy pulse electric current is: pulse width 20～100 μ s, frequency 100～1500Hz, the amplitude 200～1500A/mm of current density
2Present method is applicable to that diameter is the on-line continuous softening annealing processing of the middle and high carbon steel wire of Φ 0.05～6.5mm.
Embodiment 1: the GCr15 steel wire that original annealed state diameter is 2.00mm is after the multi-pass cold drawing, and the diameter of silk is 1.05mm.Adopt equipment shown in Figure 1 and high energy electric pulse on-lining soften annealing process of the present invention that this GCr15 steel wire is handled.Fig. 2 is the metallographic structure (Spheroidizing Annealing tissue) of GCr15 steel wire before cold drawn strain hardening, and spheroidite is evenly distributed in the ferrite matrix.Fig. 3 for the GCr15 steel wire through the metallographic structure after the cold drawn strain hardening, the elongation of ferrite matrix crystal grain is for fibrous, cementite still is spherical, distributes along the ferrite deformation direction.
With reference to Fig. 1, the GCr15 steel wire is driven in the direction of arrows with speed 6m/min or 16m/min transmission by decoiling equipment 1 and wrap-up 2, and the positive and negative electrode of high energy pulse power supply then covers electric imposing region that electrode (electrode distance is 250mm) that nickel dam makes inserts the GCr15 steel wire of motion from copper respectively to carry out continuous softening annealing and handle.The pulse width 60 μ s of the high energy pulse electric current of input, voltage is 110V, and frequency is 330Hz, and pulse peak current density is 550A/mm
2
Experiment is found, in the GCr15 steel wire that high energy electric pulse is handled, any lamellar pearlite do not occur, still is evenly distributed in the ferrite matrix behind the recrystallize (as Fig. 4) for spheroidite.Promptly handle making GCr15 reach the effect of softening annealing by electricimpulse, reduced energy consumption, improved production efficiency, the tissue and the mechanical property of material are even, steady quality.
Performance before and after the GCr15 steel wire is handled relatively sees Table 1.Table 1 is the result show: GCr15 steel wire and the original annealed state GCr15 steel wire handled through the high energy electric pulse softening annealing compare, and Tensile strength obviously improves, and unit elongation is approaching simultaneously, through the GCr15 steel wire excellent comprehensive mechanical property of softening annealing processing.
Table 1
| GCr15 | Original annealed state (φ 2.00mm) | Work hardening attitude (φ 1.05mm) | Electricimpulse is handled back (φ 1.05mm) |
| Tensile strength (MPa) | 615 | 1180 | 685 |
| Unit elongation (%) | 25 | 2 | 23 |
Embodiment 2: originally be 55 steel wires of work hardening attitude, diameter 0.98mm.Adopt equipment shown in Figure 1 and high energy electric pulse on-line continuous softening annealing process of the present invention that this 55 steel wire is handled.Fig. 5 is the metallographic structure after the 55 steel wire work hardening, and the ferrite crystal grain elongation is for fibrous, and perlite distributes along the ferrite deformation direction.
With reference to Fig. 1,55 steel wires are driven in the direction of arrows with speed 8m/min transmission by decoiling equipment 1 and wrap-up 2, and the positive and negative electrode of high energy pulse power supply then covers electric imposing region that electrode (electrode distance is 250mm) that nickel dam makes inserts 55 steel wires of motion from copper respectively to carry out continuous softening annealing and handle.The pulse width 60 μ s of the high energy pulse electric current of input, voltage is 110V, and frequency is 380Hz, and pulse peak current density is 250A/mm
2
Experiment finds that after high energy electric pulse was handled, 55 steel wires were grey black fine pearlite and white ferritic structure, distributes crystal grain tiny (as Fig. 6) along crystal boundary.Promptly handle making 55 steel wires reach the effect of softening annealing by electricimpulse, improved production efficiency, reduced energy consumption, the tissue and the mechanical property of material are even, steady quality.
Performance before and after 55 steel wires are handled relatively sees Table 2.Table 2 is the result show: continuous softening annealing is handled through high energy electric pulse 55 steel wires and conventional annealing attitude 55 steel wires compare, and under the approaching situation of unit elongation, Tensile strength obviously improves, and promptly 55 steel wires have obtained the excellent comprehensive mechanical property.
Table 2
| 55 | Conventional annealing | The work hardening attitude | After electricimpulse is handled |
| Tensile strength (MPa) | 660 | 2080 | 775 |
| Unit elongation (%) | 13 | ≤2 | 11 |
Claims (6)
1, utilize high energy electric pulse centering, high-carbon steel wire to carry out on-line continuous softening annealing method, its feature may further comprise the steps: drive steel wire by decoiling equipment and wrap-up and transmit to described wrap-up direction with certain speed; Dispose a high energy pulse power supply, this power supply is continuously exported high energy electric pulse, and the electric imposing region of the steel wire of by the pair of electrodes input motion carries out continuous softening annealing and handles.
2, utilize high energy electric pulse centering, the high-carbon steel wire according to claim 1 carries out on-line continuous softening annealing method, it is characterized in that: according to middle and high carbon steel wire diameter and final performance requriements, the processing parameter of the high energy pulse electric current of the steel wire electric imposing region that input motion during anneal is: pulse width 10～200 μ s, frequency 50～3000Hz, the amplitude 100～1500A/mm of current density
2
3, utilize high energy electric pulse centering, the high-carbon steel wire according to claim 2 carries out on-line continuous softening annealing method, it is characterized in that: the processing parameter of described high energy pulse electric current is: pulse width 20～100 μ s, frequency 100～1500Hz, the amplitude 200～1500A/mm of current density
2
4, according to claim 1 and 2 utilize high energy electric pulse centering, high-carbon steel wire on-line continuous softening annealing method, it is characterized in that: steel wire diameter Φ 0.05～6.5mm.
5, utilize high energy electric pulse centering, the high-carbon steel wire according to claim 1 carries out on-line continuous softening annealing method, and it is characterized in that: the distance between the described positive and negative electrode is 80～400mm.
6, utilize high energy electric pulse centering, the high-carbon steel wire according to claim 1 carries out on-line continuous softening annealing method, and it is characterized in that: the transmission speed of described middle and high carbon steel wire is 0.5～80m/min.
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| CN102212671A (en) * | 2011-05-23 | 2011-10-12 | 清华大学深圳研究生院 | Method for promoting growth of GOSS textures of silicon steel strips by using pulse current |
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| CN111763813A (en) * | 2020-05-26 | 2020-10-13 | 东南大学 | Production method for treating high-strength high-toughness high-carbon steel wire by electric pulse |
| CN112725566A (en) * | 2020-12-17 | 2021-04-30 | 北京科技大学 | Method for inhibiting local deformation plastic instability behavior of medium and high manganese steel |
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| CN102212671A (en) * | 2011-05-23 | 2011-10-12 | 清华大学深圳研究生院 | Method for promoting growth of GOSS textures of silicon steel strips by using pulse current |
| CN108130404A (en) * | 2018-02-22 | 2018-06-08 | 江阴振宏重型锻造有限公司 | A kind of fusion reactor large scale fine grain special-shaped component and its manufacturing process |
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| CN108531710A (en) * | 2018-05-08 | 2018-09-14 | 北京科技大学 | A kind of method that pulse current quickly improves 30MnSi steel corrosion resistances |
| CN111763813A (en) * | 2020-05-26 | 2020-10-13 | 东南大学 | Production method for treating high-strength high-toughness high-carbon steel wire by electric pulse |
| CN112725566A (en) * | 2020-12-17 | 2021-04-30 | 北京科技大学 | Method for inhibiting local deformation plastic instability behavior of medium and high manganese steel |
| GB2607320A (en) * | 2021-06-02 | 2022-12-07 | Rolls Royce Plc | Method |
| CN113444871A (en) * | 2021-07-21 | 2021-09-28 | 山西阳煤化工机械（集团）有限公司 | Method for regulating and controlling strengthening and toughening of ferritic stainless steel based on high-frequency pulse current |
| CN114231719A (en) * | 2021-12-14 | 2022-03-25 | 北京科技大学 | Electric pulse treatment method for improving strength of high-carbon steel hot-rolled wire |
| CN114231719B (en) * | 2021-12-14 | 2022-12-20 | 北京科技大学 | Electric pulse treatment method for improving strength of high-carbon steel hot-rolled wire |
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