CN103589843A - On-line control method of banded structure and hardness of gear steel and post-rolling on-line controlled cooling bed device - Google Patents
On-line control method of banded structure and hardness of gear steel and post-rolling on-line controlled cooling bed device Download PDFInfo
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Abstract
The invention discloses an on-line control method of a banded structure and hardness of gear steel. The method comprises the steps: controlling the finishing temperature of a gear steel rod at 900-980 DEG C, controlling the cooling speed of the gear steel rod in a three-stage cooling manner after rolling: air-cooling the high temperature gear steel rod after the rolling, reducing the surface temperature of the rod to 800-830 DEG C, and controlling the difference between the core temperature and the surface temperature of the rod to be within 150 DEG C, performing forced air cooling on the precooled rod, controlling the surface temperature of the rod, air-cooling to 620-680 DEG C, keeping the rod after the forced cooling warm, slowly cooling, and stopping cooling for 15-50min. The invention further discloses a post-rolling on-line controlled cooling bed device. A cooling bed system of the device is formed by combining three stepped cooling beds, namely a precooling bed, an air cooling bed and a slow cooling bed. The method can control the banded structure within a second stage, the structural homogeneity of the gear steel rod is improved, and the hardness requirements during blanking of the gear steel rod are met.
Description
Technical field
The present invention relates to a kind of gear-used steels material manufacturing technique and device thereof, particularly relate to a kind of steel stocking of taking turns and prick postheat treatment method and device thereof, be applied to Pinion Steel products production and manufacture field.
Background technology
Pinion Steel is the critical material of manufacturing automobile gearbox, driving the transmission component such as back axle, to comprising that the every metallurgical index of banded structure all has very high requirement.Banded structure in Pinion Steel, refers to form along rolling direction, and the proeutectoid ferrite of take is main band is the band the led stacking tissue morphology forming each other with perlite, is internal defects of steel.The existence of banded structure can make the mechanical property of steel be anisotropy, along the performance of banded direction, is better than its lateral performance, and vertical banded direction plasticity, impelling strength and relative reduction in area significantly reduce.During containing the Pinion Steel machining of banded structure, can accelerate the wearing and tearing of cutter, cementation process can cause cementation zone inhomogeneous, in quenching process, between band, can produce internal stress, easily causes that the distorsion during quenching of gear even cracks.
Cr-Mo and Cr-Ni-Mo series are the gear steel grades that easily forms banded structure, especially the Cr-Mo more than 100mm for the diameter of large specification billet production, Cr-Ni-Mo Series Gear Steel Bar, the banded structure that ubiquity is more serious, and be difficult for eliminating general requirement banded structure≤3 grade.
Dendritic segregation is the basic reason that banded structure forms.Pinion Steel molten steel is grown up in dendroid mode at process of setting, because causing dendrite, a choosing minute crystallization does and interdendritic uneven chemical components, the alloying elements such as more C, the Mn of interdendritic after coagulation enrichment, Cr, Mo, and the first solidified superalloy element in the dry position of dendrite is on the low side.When strand rolling, large dendritic crystal elongates along deformation direction, consistent with deformation direction gradually, form dilution band and the zone of enrichment of carbon and alloying element, after rolling, Slow cooling process ferrite is preferentially at alloying element dilution band forming core, and to both sides alloying element zone of enrichment row carbon, last zone of enrichment forms perlite, thereby forms ferrite+perlite banded structure.
Conventionally by optimizing continuous casting process, roll and front strand carried out to long-time high temperature homogenizing annealing, reduce segregation degree, to alleviate banded structure.But it is very limited to improve dendritic segregation degree in the continuous casting stage, high-temperature homogenization process strand scaling loss is serious, and high energy consumption is undesirable.In addition publication No. is that CN101381803A utility model patent proposes to control different rolling technologys and parameter alleviates banded structure rank, but poor for large scale rod bar suitability, and different iron and steel enterprises are subject to produce equipment and condition restriction, actual process is implemented to be difficult to carry out.Under current Technical facilities in production, reduce and roll the rank that rear cooling rate can be accelerated banded structure, improve cooling rate and be conducive to improve banded structure.Publication No. is that CN102876868A proposes high-temperature homogenization, increases austenite crystal, rolls rear cold bed ingress and carries out air-cooled raising low carbon manganese steel performance and homogeneity.But very easily obtain bainite structure for Series Gear steel such as the higher Cr-Mo of hardening capacity and Cr-Ni-Mo, cause hardness higher, increased the blanking difficulty of Pinion Steel, reduced cutter life.The optimized cutting durometer level of Pinion Steel is at 160-230HB, existing Controlled Cooling of Rod after Rolling is not enough, the slow banded structure of cooling rate in summer is serious, the fast bar hardness of cooling rate in winter is higher, and structure property is unstable, and therefore existing gear steel production process is difficult to meet the production requirement of high-quality Pinion Steel steel grade, adopt tradition to roll the banded rank of rear cold bed air cooling technique Pinion Steel and generally can only be controlled at 2.5 grades of left and right, see Fig. 5, from microcosmic metallograph, the banded tendency of Pinion Steel is still obvious.
Summary of the invention
In order to solve prior art problem, the object of the invention is to overcome the deficiency that prior art exists, a kind of toothed wheel steel band structure and hardness On-Line Control Method are provided and roll after at the cold bed apparatus of line traffic control, being particularly useful for large specification continuous casting billet milling and rolling parameter, to be difficult for production specification under regularization condition be the Pinion Steel bar of φ 40 ~ 200mm, banded structure can be controlled in 2 grades, improve Pinion Steel bar homogeneity of structure, meet the hardness requirement of Pinion Steel bar material baiting processing simultaneously.
For reaching foregoing invention, create object, the present invention adopts following technical proposals:
A kind of toothed wheel steel band structure and hardness On-Line Control Method, pinion Steel Bar finishing temperature is 900～980 ℃, roll the rear cooling rate of rolling of three sections of type of cooling pinion Steel Bar of rear employing, the Pinion Steel bar that completes three sections of cooling process techniques is finally made Pinion Steel material finished product, and the specific embodiment of its cooling process technique is:
A. the pre-cooled technological process of first paragraph: make to roll rear high temperature Pinion Steel bar and first carry out air cooling, Pinion Steel Surface of Rod Bar temperature is chilled to 800 ~ 830 ℃, object is to reduce the heart table temperature difference that bar causes because of rolling, more than making Pinion Steel bar precooling stop 130s, the heart table temperature difference of Pinion Steel bar is controlled in 150 ℃, extend high-temperature zone residence time increase austenite crystal is 6.5 ~ 8 grades simultaneously, for back segment control is cold, prepares;
B. second segment Constraint Cooling Technology process: the Pinion Steel bar through pre-cooled technological process of first stage is carried out to air blast cooling again, bar is fast through the α+γ two-phase region on Fe-C phasor, the band shape that effectively suppresses high-temperature zone proeutectoid ferrite is separated out, pinion Steel Bar surface temperature is air-cooled to 620 ~ 680 ℃, determines the cooling residence time of final cooling temperature, speed of cooling, pressure and the cold wind convection intensity of Pinion Steel bar according to the steel grade of Pinion Steel bar and specification;
C. the 3rd section of Slow cooling technological process: the Pinion Steel bar through second segment Constraint Cooling Technology process is incubated to Slow cooling again, the starting temperature of insulation Slow cooling is when completing second segment Constraint Cooling Technology process, the minimum surface temperature of Pinion Steel bar, also i.e. air-cooled lower limit temperature in second segment Constraint Cooling Technology process, make Pinion Steel bar Slow cooling stop 15 ~ 50min, supercooled austenite is fully changed to ferritic-pearlitic, and then going out cold bed is finished product through runoff table to cold shears cutting to length.
In the pre-cooled technological process of first paragraph, the precooling of Pinion Steel bar stops and is preferably 130s ~ 170s.
In the 3rd section of Slow cooling technological process, Slow cooling cooling rate is preferably 0.01 ~ 0.05 ℃/s.
The specification that technique scheme of the present invention is preferably applicable to Pinion Steel bar is the rear cooling process technique of rolling of diameter phi 40 ~ 200mm.
The present invention has also passed through after a kind of rolling at the cold bed apparatus of line traffic control, by rolling rear cold-bed run-in table, cold bed system, runoff table and Controlling System form, Controlling System is connected with the series of temperature sensor output end signal of cold bed system, temperature sensor respectively detection of gear Steel Bar enters the first cold temperature of cold bed system and leaves the final cooling temperature of cold bed system, the instruction signal output terminal of Controlling System and the stocking transfer mechanism of cold bed system, and then the speed of cooling of pinion Steel Bar and the cooling residence time, cold bed system is successively side by side by precooling cold bed, three sections of step cooling beds of the gentle cold bed of air-cooled cold bed combine, precooling cold bed connect material position with roll rear cold-bed run-in table adjacency, air-cooled cold bed adopts aerofoil fan to carry out air blast cooling to the Pinion Steel bar of its top, the air of driving gear Steel Bar near surface carries out convection current, aerofoil fan is arranged in air-cooled cold bed bottom, slow cooling cold bed adopts upper and lower stay-warm case, upper and lower stay-warm case is all by stay-warm case shell, three layers of stay-warm case middle layer and stay-warm case working linings are composited, stay-warm case middle layer is between stay-warm case shell and stay-warm case working lining, between the working lining of stay-warm case up and down of upper and lower stay-warm case, form the heat insulation work bore passages of slow cooling cold bed, the discharging position of precooling cold bed and runoff table adjacency, the Pinion Steel bar that rolls rear high temperature after rolling cold-bed run-in table to the position that connects material of precooling cold bed, and it is cold by traversing conveying, to be arrived the enterprising line space of precooling cold bed, control the precooling cold bed Steel Bar surface temperature that cogs and be chilled to 800 ~ 830 ℃, more than making Pinion Steel bar precooling stop 130s, the heart table temperature difference of Pinion Steel bar is controlled in 150 ℃, complete pre-cooled after, Pinion Steel bar is transported to air-cooled cold bed by precooling cold bed is traversing, Controlling System Control Shaft flow fan carries out air blast cooling to Pinion Steel bar, according to the steel grade of Pinion Steel bar and specification, determine aerofoil fan air quantity, air-cooled cold bed stepping rate, the final cooling temperature of Pinion Steel bar, speed of cooling, force the cooling residence time, Pinion Steel Surface of Rod Bar temperature is air-cooled to 620 ~ 680 ℃, complete after air blast cooling, Pinion Steel bar is fast incubated Slow cooling in the traversing heat insulation work bore passages that is sent to slow cooling cold bed by air-cooled cold bed, make Pinion Steel bar Slow cooling stop 15 ~ 50min.
Between above-mentioned stay-warm case shell and stay-warm case working lining, preferably by laying, be incubated asbestos and form stay-warm case middle layer, stay-warm case working lining is preferably formed by metallic reflection type lagging material.
The stocking transfer mechanism of above-mentioned precooling cold bed preferably adopts the carry-over bar transmission rig with large tooth pitch, make the rack gear of precooling cold bed adopt the traversing mode of movement conveyance gear of stepped start-stop system Steel Bar, the precooling cold bed of comparing, the stocking transfer mechanism of above-mentioned slow cooling cold bed preferably adopts the carry-over bar transmission rig with little tooth pitch, make the rack gear of slow cooling cold bed also adopt the traversing mode of movement conveyance gear of stepped start-stop system Steel Bar, , during running according to Pinion Steel bar specification, determine that each tooth puts Pinion Steel bar quantity, during the insulation of small dimension Pinion Steel bar, on each tooth, put two rooted tooth wheel Steel Bar, to guarantee that cooling rate is enough slow, fully carry out ferrite-pearlite transformation, suppressing bainite structure forms
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage:
1. utilization of the present invention is rolled rear online waste heat and is heat-treated, and the air-cooled formation that can effectively suppress large scale rod bar banded structure, saves production cost, and improves the quality of products;
2. the present invention is for the Pinion Steel of high-hardenability, and air-cooled rear slow cooling energy on-line Control bar tissue meets hardness requirement, goes out cold bed without turnover burial pit, enhances productivity;
3. cold bed segmentation process for cooling of the present invention is simple, suitability is strong, can adjust segmentation process for cooling according to the bar of different steel grades and specification.
Accompanying drawing explanation
Fig. 1 is at the topology layout schematic diagram of the cold bed apparatus of line traffic control after the embodiment of the present invention one is rolled.
Fig. 2 is that the air-cooled cold bed bottom of the embodiment of the present invention one is along roller-way direction blower fan distribution schematic diagram.
Fig. 3 is the mounting structure of the stay-warm case up and down schematic diagram of the slow cooling cold bed of the embodiment of the present invention one.
Fig. 4 is the Pinion Steel micrograph that adopts the embodiment of the present invention one toothed wheel steel band structure and hardness On-Line Control Method.
Fig. 5 is that prior art adopts tradition to roll rear cold bed air cooling technique Pinion Steel micrograph.
Embodiment
Details are as follows for the preferred embodiments of the present invention:
embodiment mono-:
In the present embodiment, referring to Fig. 1～Fig. 4, after a kind of rolling at the cold bed apparatus of line traffic control, by rolling rear cold-bed run-in table 1, cold bed system, runoff table 2 and Controlling System form, Controlling System is connected with the series of temperature sensor output end signal of cold bed system, temperature sensor respectively detection of gear Steel Bar 4 enters the first cold temperature of cold bed system and leaves the final cooling temperature of cold bed system, the instruction signal output terminal of Controlling System and the stocking transfer mechanism of cold bed system, and then the speed of cooling of pinion Steel Bar 4 and the cooling residence time, it is characterized in that: cold bed system is successively side by side by precooling cold bed A, tri-sections of step cooling beds of the gentle cold bed C of air-cooled cold bed B combine, precooling cold bed A connect material position with roll rear cold-bed run-in table 1 adjacency, air-cooled cold bed B adopts aerofoil fan 5 to carry out air blast cooling to the Pinion Steel bar 4 of its top, the air of driving gear Steel Bar 4 near surfaces carries out convection current, aerofoil fan 5 is arranged in air-cooled cold bed B bottom, slow cooling cold bed C adopts upper and lower stay-warm case, upper and lower stay-warm case is all by stay- warm case shell 9, 7 three layers of stay-warm case middle layer 8 and stay-warm case working linings are composited, stay-warm case middle layer 8 is between stay-warm case shell 9 and stay-warm case working lining 7, between the working lining of stay-warm case up and down 7 of upper and lower stay-warm case, form the heat insulation work bore passages of slow cooling cold bed C, to reduce the radiative transfer of Pinion Steel bar 4, the discharging position of precooling cold bed A and runoff table 2 adjacency, the Pinion Steel bar 4 that rolls rear high temperature after rolling cold-bed run-in table 1 to the position that connects material of precooling cold bed A, by traversing conveying, arrived the enterprising line space of precooling cold bed A cold, control precooling cold bed A Steel Bar 4 surface temperatures that cog and be chilled to 800 ~ 830 ℃, object is to reduce the heart table temperature difference that bar causes because of rolling, more than making Pinion Steel bar 4 precoolings stop 130s, the heart table temperature difference of Pinion Steel bar 4 is controlled in 150 ℃, extend high-temperature zone residence time increase austenite crystal is 6.5 ~ 8 grades simultaneously, for back segment control is cold, prepare, complete pre-cooled after, Pinion Steel bar 4 is transported to air-cooled cold bed B by precooling cold bed A is traversing, 5 pairs of Pinion Steel bars of Controlling System Control Shaft flow fan 4 carry out air blast cooling, bar is fast through the α+γ two-phase region on Fe-C phasor, the band shape that effectively suppresses high-temperature zone proeutectoid ferrite is separated out, according to the steel grade of Pinion Steel bar 4 and specification, determine aerofoil fan 5 air quantity, air-cooled cold bed B stepping rate, the final cooling temperature of Pinion Steel bar 4, speed of cooling, force the cooling residence time, Pinion Steel bar 4 surface temperatures are air-cooled to 620 ~ 680 ℃, complete after air blast cooling, Pinion Steel bar 4 is incubated Slow cooling by the quick traversing heat insulation work inner chamber interior passageway that is sent to slow cooling cold bed C of air-cooled cold bed B, make Pinion Steel bar 4 Slow coolings stop 15 ~ 50min, supercooled austenite is fully changed to ferritic-pearlitic, simultaneously slow cooling is rationally controlled cooling rate and has been avoided cooling rate too fast and change bainite structure into, thereby reduce bar hardness, improve machinability.
In the present embodiment, referring to Fig. 1 and Fig. 3, be incubated asbestos form stay-warm case middle layer 8 between stay-warm case shell 9 and stay-warm case working lining 7 by laying, stay-warm case working lining 7 is formed by metallic reflection type lagging material.
In the present embodiment, referring to Fig. 1 and Fig. 3, the stocking transfer mechanism of precooling cold bed A is the carry-over bar transmission rig with large tooth pitch, make the rack gear of precooling cold bed A adopt the traversing mode of movement conveyance gear of stepped start-stop system Steel Bar 4, and guarantee the heat exchange between each Pinion Steel bar 4 and air, precooling cold bed A compares, the stocking transfer mechanism of slow cooling cold bed C is the carry-over bar transmission rig with little tooth pitch, makes the rack gear of slow cooling cold bed C also adopt the traversing mode of movement conveyance gear of stepped start-stop system Steel Bar 4.
In the present embodiment, after Pinion Steel bar 4 is produced finish to gauge, flow process is: flying shear shearing → cold-bed run-in table 1 → precooling cold bed A → air-cooled cold bed B → slow cooling cold bed C → cold bed runoff table 2 → cutting to length → detection → bundling → warehouse-in.Referring to Fig. 1～Fig. 4, choose AISI 8620H (20CrNiMo) Pinion Steel, continuously cast bloom specification is 300mm * 300mm, finish to gauge backgear Steel Bar 4 diameters are φ 90mm, surface temperature is 940 ~ 980 ℃, roll 3 sections of types of cooling controls of rear employing and roll rear speed of cooling, first the throughput direction along d2 through cold-bed run-in table 1 after rolling shown in Fig. 1, arrive after the receiving station of precooling cold bed A, by along the translation of d1 direction, Pinion Steel bar 4 is transported on precooling cold bed A, precooling 130 ~ 150s on precooling cold bed A, Pinion Steel bar 4 surface temperatures arrive 800 ~ 820 ℃, the upper temperature sensor of precooling cold bed A receives temperature signal, and temperature signal is transmitted to Controlling System, Controlling System is by the carry-over bar stepping mechanism of precooling cold bed A, along d1 direction is traversing, bar is transported to air-cooled cold bed B.As shown in Figure 2,5 pairs of Pinion Steel bars of aerofoil fan 4 carry out air blast cooling, Pinion Steel bar 4 is fast by the α+γ two-phase region on Fe-C phasor, effectively suppressed to separate out along the proeutectoid ferrite band shape of rolling direction, it is air-cooled lower limit temperature that air-cooled about 335s is 640 ℃ to Pinion Steel bar 4 surface temperatures, along the traversing slow cooling cold bed C sending into upper and lower stay-warm case of d1 direction, be incubated fast, as shown in Figure 3, cold bed C slow cooling cooling rate is 0.01 ~ 0.05 ℃/s, insulation 30min after the throughput direction output of d2, carries out cutting to length by runoff table 2.Through 1 grade of the present embodiment technique bar banded structure average out to, banded structure is minimum is 0.5 grade, as shown in Figure 4, is obviously better than banded structure that tradition adopts out finish to gauge Direct Air-Cooled explained hereafter and is the Pinion Steel of 2.5 grades, as shown in Figure 5.Adopt the homogeneity of structure of the Pinion Steel of the present embodiment technology and device production to improve a lot, hardness is 185HBS.The Pinion Steel bar 4 cooling control after rolling technology controlling and process banded structures that adopt the present embodiment technology and device to produce, reduce bar hardness, make full use of and roll rear waste heat, improve the quality of products and production efficiency.Through this processing method and equipment, can effectively realize the control that large scale rod bar process of cooling section temperature changes, thereby realize effective control of banded structure and hardness.Different size bar banded structure is controlled at 0 ~ 2 grade, and Hardness Control, at 160 ~ 230HB, is stablized bar structure property.
embodiment bis-:
The present embodiment and embodiment mono-are basic identical, and special feature is:
In the present embodiment, choose AISI 8620H (20CrNiMo) Pinion Steel, continuously cast bloom specification is 300mm * 300mm, finish to gauge backgear Steel Bar 4 diameters are φ 120mm, surface temperature is 930 ~ 970 ℃, after rolling, runoff table 1 arrives precooling cold bed A, precooling 160 ~ 170s on precooling cold bed A, Pinion Steel bar 4 surface temperatures reach 800 ~ 830 ℃, the upper temperature sensor of precooling cold bed A receives signal, and Controlling System is transported to air-cooled cold bed B by the carry-over bar stepping mechanism of precooling cold bed A Pinion Steel bar 4.5 pairs of Pinion Steel bars of aerofoil fan 4 carry out air blast cooling, Pinion Steel bar 4 is fast by the α+γ two-phase region on Fe-C phasor, effectively suppressed to separate out along the proeutectoid ferrite band shape of rolling direction, it is air-cooled lower limit temperature that air-cooled about 415s is 640 ℃ to Pinion Steel bar 4 surface temperatures, the traversing slow cooling cold bed C sending into upper and lower stay-warm case is incubated fast, slow cooling cold bed C slow cooling cooling rate is 0.01 ~ 0.05 ℃/s, and insulation 20min carries out cutting to length after by runoff table 2.Adopting the banded structure of the φ 120mmAISI 8620H Pinion Steel of the present embodiment technology and device production is 1 grade, and hardness is 179HBS.
embodiment tri-:
The present embodiment and previous embodiment are basic identical, and special feature is:
In the present embodiment, choosing Cr-Mo is SCM822H (22CrMoH) Pinion Steel, continuously cast bloom specification is 300mm * 340mm, finish to gauge backgear Steel Bar 4 diameters are φ 90mm, surface temperature is 930 ~ 980 ℃, and after rolling, runoff table 1 arrives precooling cold bed A, precooling 130 ~ 150s on precooling cold bed A, Pinion Steel bar 4 surface temperatures are 800 ~ 830 ℃, and Controlling System is transported to air-cooled cold bed B by the carry-over bar stepping mechanism of precooling cold bed A bar.5 pairs of Pinion Steel bars of aerofoil fan 4 carry out air blast cooling, Pinion Steel bar 4 is fast by the α+γ two-phase region on Fe-C phasor, effectively suppressed to separate out along the proeutectoid ferrite band shape of rolling direction, it is air-cooled lower limit temperature that air-cooled about 400s Pinion Steel bar 4 surface temperatures are 660 ℃, the traversing slow cooling cold bed C sending into upper and lower stay-warm case is incubated fast, slow cooling cold bed C slow cooling cooling rate is 0.01 ~ 0.05 ℃/s, and insulation 40min carries out cutting to length after by runoff table 2.The φ 90mm SCM822H toothed wheel steel band structure that adopts the present embodiment technology and device to produce is 1.5 grades, and hardness is 198HBS.
By reference to the accompanying drawings the embodiment of the present invention is illustrated above; but the invention is not restricted to above-described embodiment; can also make multiple variation according to the object of innovation and creation of the present invention; the change of making under all spirit according to technical solution of the present invention and principle, modification, substitute, combination, simplify; all should be equivalent substitute mode; as long as goal of the invention according to the invention; only however deviate from toothed wheel steel band structure of the present invention and hardness On-Line Control Method and roll after in know-why and the inventive concept of the cold bed apparatus of line traffic control, all belong to protection scope of the present invention.
Claims (7)
1. a toothed wheel steel band structure and hardness On-Line Control Method, it is characterized in that, pinion Steel Bar finishing temperature is 900～980 ℃, roll the rear cooling rate of rolling of three sections of type of cooling pinion Steel Bar of rear employing, the Pinion Steel bar that completes three sections of cooling process techniques is finally made Pinion Steel material finished product, and the specific embodiment of its cooling process technique is:
A. the pre-cooled technological process of first paragraph: make to roll rear high temperature Pinion Steel bar and first carry out air cooling, Pinion Steel Surface of Rod Bar temperature is chilled to 800 ~ 830 ℃, more than making Pinion Steel bar precooling stop 130s, the heart table temperature difference of Pinion Steel bar is controlled in 150 ℃;
B. second segment Constraint Cooling Technology process: the Pinion Steel bar through pre-cooled technological process of first stage is carried out to air blast cooling again, pinion Steel Bar surface temperature is air-cooled to 620 ~ 680 ℃, determines the cooling residence time of final cooling temperature, speed of cooling, pressure and the cold wind convection intensity of Pinion Steel bar according to the steel grade of Pinion Steel bar and specification;
C. the 3rd section of Slow cooling technological process: the Pinion Steel bar through second segment Constraint Cooling Technology process is incubated to Slow cooling again, the starting temperature of insulation Slow cooling is when completing second segment Constraint Cooling Technology process, the minimum surface temperature of Pinion Steel bar, also i.e. air-cooled lower limit temperature in second segment Constraint Cooling Technology process, makes Pinion Steel bar Slow cooling stop 15 ~ 50min.
2. toothed wheel steel band structure and hardness On-Line Control Method according to claim 1, is characterized in that: in the pre-cooled technological process of first paragraph, the precooling of Pinion Steel bar stops 130s ~ 170s.
3. according to toothed wheel steel band structure described in claim 1 or 2 and hardness On-Line Control Method, it is characterized in that: in the 3rd section of Slow cooling technological process, Slow cooling cooling rate is 0.01 ~ 0.05 ℃/s.
4. according to toothed wheel steel band structure described in claim 1 or 2 and hardness On-Line Control Method, it is characterized in that: the specification of Pinion Steel bar is diameter phi 40 ~ 200mm.
5. one kind implements the claims after the rolling of toothed wheel steel band structure and hardness On-Line Control Method described in 1 at the cold bed apparatus of line traffic control, by rolling rear cold-bed run-in table (1), cold bed system, runoff table (2) and Controlling System form, described Controlling System is connected with the series of temperature sensor output end signal of described cold bed system, described temperature sensor difference detection of gear Steel Bar (4) enters the first cold temperature of described cold bed system and leaves the final cooling temperature of described cold bed system, the instruction signal output terminal of described Controlling System and the stocking transfer mechanism of described cold bed system, and then the speed of cooling of pinion Steel Bar (4) and the cooling residence time, it is characterized in that: described cold bed system is successively side by side by precooling cold bed (A), gentle cold bed (C) the three sections of step cooling beds of air-cooled cold bed (B) combine, described precooling cold bed (A) connect material position with described in roll rear cold-bed run-in table (1) adjacency, described air-cooled cold bed (B) adopts aerofoil fan (5) to carry out air blast cooling to the Pinion Steel bar (4) of its top, the air of driving gear Steel Bar (4) near surface carries out convection current, described aerofoil fan (5) is arranged in described air-cooled cold bed (B) bottom, described slow cooling cold bed (C) adopts upper and lower stay-warm case, described upper and lower stay-warm case is all by stay-warm case shell (9), (7) three layers of stay-warm case middle layer (8) and stay-warm case working linings are composited, described stay-warm case middle layer (8) is positioned between stay-warm case shell (9) and described stay-warm case working lining (7), between the working lining of stay-warm case up and down (7) of described upper and lower stay-warm case, form the heat insulation work bore passages of described slow cooling cold bed (C), the discharging position of described precooling cold bed (A) and described runoff table (2) adjacency, the Pinion Steel bar (4) that rolls rear high temperature through described in roll after cold-bed run-in table (1) to the position that connects material of described precooling cold bed (A), by traversing conveying, arrived the enterprising line space of described precooling cold bed (A) cold, control described precooling cold bed (A) Steel Bar (4) surface temperature that cogs and be chilled to 800 ~ 830 ℃, more than making Pinion Steel bar (4) precooling stop 130s, the heart table temperature difference of Pinion Steel bar (4) is controlled in 150 ℃, complete pre-cooled after, Pinion Steel bar (4) is by the traversing described air-cooled cold bed (B) that is transported to of described precooling cold bed (A), described Controlling System is controlled described aerofoil fan (5) Pinion Steel bar (4) is carried out to air blast cooling, according to the steel grade of Pinion Steel bar (4) and specification, determine described aerofoil fan (5) air quantity, described air-cooled cold bed (B) stepping rate, the final cooling temperature of Pinion Steel bar (4), speed of cooling, force the cooling residence time, Pinion Steel bar (4) surface temperature is air-cooled to 620 ~ 680 ℃, complete after air blast cooling, Pinion Steel bar (4) is incubated Slow cooling by the quick traversing heat insulation work inner chamber interior passageway that is sent to described slow cooling cold bed (C) of described air-cooled cold bed (B), make Pinion Steel bar (4) Slow cooling stop 15 ~ 50min.
6. after rolling according to claim 5 at the cold bed apparatus of line traffic control, it is characterized in that: between stay-warm case shell (9) and described stay-warm case working lining (7), by laying, be incubated asbestos and form stay-warm case middle layer (8), described stay-warm case working lining (7) is formed by metallic reflection type lagging material.
According to after rolling described in claim 5 or 6 at the cold bed apparatus of line traffic control, it is characterized in that: the stocking transfer mechanism of described precooling cold bed (A) is the carry-over bar transmission rig with large tooth pitch, make the rack gear of described precooling cold bed (A) adopt stepped start-stop system traversing mode of movement conveyance gear Steel Bar (4), the described precooling cold bed (A) of comparing, the stocking transfer mechanism of described slow cooling cold bed (C) is the carry-over bar transmission rig with little tooth pitch, make the rack gear of described slow cooling cold bed (C) also adopt the traversing mode of movement conveyance gear of stepped start-stop system Steel Bar (4).
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Cited By (10)
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| CN105817487A (en) * | 2016-03-16 | 2016-08-03 | 山东钢铁股份有限公司 | Control method for bearing steel bar network carbide and device for implementing method |
| CN105969949A (en) * | 2016-06-02 | 2016-09-28 | 溧阳市金昆锻压有限公司 | 18CrNiMo7-6 gear shaft forging preheating isothermal annealing process |
| CN108796180A (en) * | 2018-07-06 | 2018-11-13 | 江苏南钢通恒特材科技有限公司 | 38B3 rod irons incude normalizing process |
| CN109694951A (en) * | 2017-10-24 | 2019-04-30 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of heat treatment method for eliminating the secondary banded structure of gear |
| CN109929990A (en) * | 2019-03-06 | 2019-06-25 | 上海交通大学 | The packaged type quenching cooler and method of rail press quenching |
| CN111424149A (en) * | 2020-05-11 | 2020-07-17 | 江苏联峰实业有限公司 | Gear steel strip-shaped structure control process |
| CN112139262A (en) * | 2020-08-05 | 2020-12-29 | 柳州钢铁股份有限公司 | Control method for tissue performance of rolled high-speed wire rod |
| CN112570451A (en) * | 2020-11-26 | 2021-03-30 | 宝钢特钢韶关有限公司 | 20CrMnTi steel and production method thereof |
| CN114273601A (en) * | 2021-11-10 | 2022-04-05 | 浙江跃进机械有限公司 | Cold section control system |
| CN114657350A (en) * | 2022-02-28 | 2022-06-24 | 芜湖新兴铸管有限责任公司 | Control method of hot rolling hardness of 42CrMoA bar for wind power bolt sleeve |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817487A (en) * | 2016-03-16 | 2016-08-03 | 山东钢铁股份有限公司 | Control method for bearing steel bar network carbide and device for implementing method |
| CN105969949A (en) * | 2016-06-02 | 2016-09-28 | 溧阳市金昆锻压有限公司 | 18CrNiMo7-6 gear shaft forging preheating isothermal annealing process |
| CN109694951A (en) * | 2017-10-24 | 2019-04-30 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of heat treatment method for eliminating the secondary banded structure of gear |
| CN108796180A (en) * | 2018-07-06 | 2018-11-13 | 江苏南钢通恒特材科技有限公司 | 38B3 rod irons incude normalizing process |
| CN108796180B (en) * | 2018-07-06 | 2019-12-13 | 江苏南钢通恒特材科技有限公司 | 38B3 steel bar induction normalizing process |
| CN109929990A (en) * | 2019-03-06 | 2019-06-25 | 上海交通大学 | The packaged type quenching cooler and method of rail press quenching |
| CN111424149A (en) * | 2020-05-11 | 2020-07-17 | 江苏联峰实业有限公司 | Gear steel strip-shaped structure control process |
| CN112139262A (en) * | 2020-08-05 | 2020-12-29 | 柳州钢铁股份有限公司 | Control method for tissue performance of rolled high-speed wire rod |
| CN112570451A (en) * | 2020-11-26 | 2021-03-30 | 宝钢特钢韶关有限公司 | 20CrMnTi steel and production method thereof |
| CN114273601A (en) * | 2021-11-10 | 2022-04-05 | 浙江跃进机械有限公司 | Cold section control system |
| CN114657350A (en) * | 2022-02-28 | 2022-06-24 | 芜湖新兴铸管有限责任公司 | Control method of hot rolling hardness of 42CrMoA bar for wind power bolt sleeve |
| CN114657350B (en) * | 2022-02-28 | 2023-11-17 | 芜湖新兴铸管有限责任公司 | Control method of hot-rolled hardness of 42CrMoA bar for wind power bolt sleeve |
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Application publication date: 20140219 |