CN101358279B - Technique and method for preparing biconical roller of large-sized strip hot-rolling mill transport roller - Google Patents
Technique and method for preparing biconical roller of large-sized strip hot-rolling mill transport roller Download PDFInfo
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Abstract
The invention belongs to a roller production technology of a slab band hot milling roll transport roller way. The invention provides a biconical roller production technology of a large-sized slab band hot milling roll transport roller way as follows: forging blank piece normalizing treatment, ultrasonic inspecting, rough machining before thermal refining, thermal refining, semifinishing, roller body surface quenching, tempering, finish machining and inspection of all surface magnetic powder of the roller or dye penetration; in the processes of the roller body surface quenching and the tempering, the biconical roller is divided into different heating sections according to the roller body structural size of the biconical roller, the different sections of the biconical body adopt the mode ofdifferent heating strength and same heating time according to different structures of the sections, so that all surfaces of the roller can simultaneously obtain the identical quenching temperature and the identical depth of temperature penetration; in order to obtain the proper quenching hardness and the sufficient hardening layer and simultaneously avoid quenching cracks and reduce quenching deformation, the invention adopts the technique of water-oil double medium quenching.
Description
Technical field
The invention belongs to a kind of manufacturing technology of sheet strip hot rolling mill conveyor roller roller, relate generally to a kind of producing and manufacturing technique of large-sized strip hot rolls conveyor roller bipyramid roller.
Background technology
Along with high speed development of national economy, the use of high quality sheet material is extensive day by day, and the demand of high quality sheet material increases day by day.Production technique, slab quality and rolling equipment are depended in the production of high quality sheet material.
Obtain high-quality cold rolled sheet, high-quality hot rolling slab must be arranged.The production of high quality hot rolling slab not only has high requirement but also rolling equipment-hot rolls is also had strict requirement hot rolling technology, hot rolling slab quality.Have only high-quality equipment of hot rolling just can roll out high-quality hot-rolled sheet.The high quality hot-rolled sheet not only depends on the precision of hot rolls main frame, the height of level of automation to the high request of rolling equipment, and to the hot rolls subsidiary engine--the requirement of hot rolled plate handling equipment conveyor roller also has very high requirement:
1) contact area of hot rolled plate and conveyor roller roller reduces to minimum as much as possible, avoids the hot rolled plate surface because of producing scuffing with too much contact of transportation equipment;
2) friction of hot rolled plate and transportation equipment contact surface reduces to minimum as much as possible;
3) require conveyor roller to have the hot rolled plate of preventing sideslip function, with the hot rolled plate automatic guiding, the side shield of cancellation conveyor roller roller both sides is eliminated the relatively sliding between hot rolled plate and the both sides side shield and the scuffing that produces;
4) require the conveyor roller roller surfaces to have certain rigidity, improve roller-way roller work-ing life, reduce the wearing and tearing of conveyor roller roller, avoid producing the scuffing that non-rolling resistance produces between roller that the wearing and tearing because of the conveyor roller roller cause and the hot rolled plate.
At present, for improving the hot rolled plate quality, sheet strip hot rolling mill conveyor roller roller is typically designed to the bipyramid roller.The application of bipyramid roller on sheet strip hot rolling mill is very general.
The application of bipyramid roller can be satisfied:
1) contact area contact by the line of original cylindrical roller and is reduced to proximate point and contacts between the conveyor roller formed of hot rolled plate and bipyramid roller, to be original hot-rolled sheet broad ways with the cylindrical roller sub-surface all contact becomes the hot-rolled sheet broad ways and the bipyramid roller surfaces has only edge contact, and it is minimum that the contact area of hot rolled plate and conveyor roller roller has reduced to.Avoided the hot rolled plate surface because of contact the scuffing that produces with conveyor roller roller too much;
2) conveyor roller of being made up of the bipyramid roller has the hot rolled plate of preventing sideslip function, the hot rolled plate automatic guiding can have been cancelled the original side shield in conveyor roller both sides, has eliminated the relatively sliding between hot rolled plate and the both sides side shield and the scuffing that produces;
Sheet material conveyor roller bipyramid roller replaces the application of cylindrical roller, make the contact area between rolled plate and roller reduce to minimum, contact 2 contacts that become along the plate width by the original line along the plate width, the load of bipyramid roller and rolled plate contact surface is big much than cylindrical roller like this.If the hardness of the bipyramid roller body of roll is not high, the wearing and tearing of as easy as rolling off a log formation bipyramid roller surfaces.After the roll wear, can cause serious scuffing to the stocking surface.For avoiding the wearing and tearing of the bipyramid roller body of roll, have only the roller surfaces of raising hardness, increase the anti-portative power of roller surfaces.In use frictional resistance is little for the roller that roller surfaces quenches, and roller surfaces is not easy to wear, and long service life helps improving the strip surface quality.
The existing complete processing of bipyramid roller:
1), rough forging, forging ratio is not less than 3.5.So that obtain the equally distributed good forging of chemical ingredients.
2), forging normalizing treatment.Make whole forging obtain the weave construction of even refinement, for element task is carried out in the further thermal treatment of workpiece.Otherwise, cause the hardening break of workpiece during possible modifier treatment and quench back fracture suddenly.
3), UT (Ultrasonic Testing).Whether detect forging inside has and does not allow the defective that exists.
4), roughing before the modifier treatment.Be the ready work of modifier treatment.
5), modifier treatment.Make workpiece obtain necessary good mechanical properties.
6), for small-sized bipyramid roller, semi-finishing.Monolateral 1.8mm～2.0mm the allowance for finish that stays of body surface, rest part stays monolateral 5mm～8mm allowance for finish.
7), body surface mid-frequency induction hardening.
8), be refined to the diagram requirement.
9), for big-and-middle-sized bipyramid roller, after modifier treatment, directly be refined to the diagram requirement.
In the existing complete processing of bipyramid roller, (containing the modifier treatment operation) all process steps and finishing step can reach requirement substantially before the modifier treatment.
The bipyramid roller of conveyor roller is because the singularity of roll profile brings very big difficulty for the thermal treatment of body surface.The bipyramid roller of conveyor roller is directly using two kinds of situations under the mother metal quality adjustment condition and under the roller surfaces quenching acquisition certain degree of hardness state in not thermal treatment of roller surfaces usually.
The bipyramid roller that not thermal treatment of surface is directly used under the mother metal quality adjustment condition in use roller surfaces weares and teares extremely easily owing to very big working load, if the roller surfaces wearing and tearing untimely replacing in back, to cause serious surface tear to the hot rolled strip surface, and then influence the further rolling of sheet material, can not be used for obtaining high-quality rolled plate; Roller surfaces quenches, and in use not only roller surfaces is not easy to wear for the bipyramid roller that obtains certain degree of hardness, long service life, and also frictional resistance is little, helps improving the surface quality of hot rolled strip.
The conveyor roller of small-sized sheet strip hot rolling mill, because the roll body length and the diameter of bipyramid roller are less relatively, generally about φ 150～φ 200x1600～2000mm, the roll diameter difference of bipyramid roller is also less, generally≤50mm, can carry out continuous induction hardening by adopting Medium frequency induction coil pair of rollers surface, tempering makes the body surface of bipyramid roller obtain certain degree of hardness then.At this moment it is bigger to obtain body surface hardness difference, generally between HRC5～8, but depth of hardening zone still can not reach design requirements (4～6mm), usually at 2～3mm.The quench-hardened case that precision work was obtained after process was quenched is generally at 1-2mm.The small-sized bipyramid roller that quenches in the surface also has the powerful quenching machine of use, adopts whole intermediate frequency inductor that whole heating, quenching, tempering acquisition are carried out in the surface of bipyramid roller.
The conveyor roller of big-and-middle-sized sheet strip hot rolling mill, because the roll body length and the diameter of bipyramid roller are relatively large, generally about φ 350～φ 500x3000～4000mm, the roll diameter difference of bipyramid roller is also bigger, generally 〉=100mm, if adopt the Medium frequency induction coil that continuous induction hardening is carried out on the surface of bipyramid roller, tempering then, the hardness value that body surface obtained differs greatly, generally reach between HRC10～20, some section hardness of at all not quenching even, the depth of hardening zone of the part of hardening differs greatly, and its quench-hardened case thickness difference is 0.5～5mm.Because the existence of quenching strain, behind the precision work worker after the hard surfacing of bipyramid roller surfaces process, the hardness difference of body surface is bigger, and the most of hardness of the body of roll falls back to surface heat handles preceding hardness, can not play the purpose that the bipyramid roller surfaces is quenched.
If adopt powerful laser hardening machine that the bipyramid roller surfaces is carried out the continuous laser hard surfacing, owing to have overlap joint temper softening phenomenon, and depth of hardening zone only has 0.1～0.5mm.This technology can not be applicable to that the integral surface of cylindrical and conical workpieces quenches.
Summary of the invention
The objective of the invention is to propose a kind of producing and manufacturing technique of large-sized strip hot rolls conveyor roller bipyramid roller, improve the quality of production of large-scale bipyramid roller, guarantee large-scale bipyramid roller surfaces hardness, the frictional force between minimizing hot rolled plate and the conveyor roller bipyramid roller and the surface tear of hot rolled strip, the work-ing life of improving sheet strip hot rolling mill conveyor roller bipyramid roller.
The constructional feature of large-sized strip hot rolls conveyor roller bipyramid roller:
The structure of sheet strip hot rolling mill conveyor roller bipyramid roller as shown in Figure 1, the body of roll 2 of bipyramid roller is by two sections cones and be positioned at one section cylindrical section of intermediary and form.The thin part in the two ends of the bipyramid roller body of roll is a spindle nose 1,3, is used for supporting and the transmission roller.Big end of cone and end diameter difference big (〉=100mm), the spindle nose portion size is less.
The technical requirements of sheet strip hot rolling mill conveyor roller bipyramid roller:
1), the material of bipyramid roller is generally selected 45 steel and 42CrMo steel for use, the manufacturing of requirement employing forging.Whole bipyramid roller carries out UT (Ultrasonic Testing), and meets 3 grades that are not less than " GB/T6402-91 steel forgings supersonic testing method " middle regulation.
2), whole bipyramid roller requires modifier treatment, and requires to reach the favorable mechanical performance.
3), the final heat treatment hardness of body surface of bipyramid roller is HRC45-49, depth of hardening zone 4～7mm.
4), all surface of bipyramid roller requires magnetic-particle inspection or infiltration penetrant inspection, and meets certain class requirement.
According to the constructional feature and the technical requirements of sheet strip hot rolling mill conveyor roller bipyramid roller, determine that the manufacturing procedure of sheet strip hot rolling mill conveyor roller bipyramid roller is:
1), rough forging, forging ratio is not less than 3.5.So that obtain the equally distributed good forging of chemical ingredients.
2), forging normalizing treatment.Make whole forging obtain the weave construction of even refinement, for element task is carried out in the further thermal treatment of workpiece.Otherwise, may cause the hardening break of workpiece and quench back fracture suddenly.
3), UT (Ultrasonic Testing).Whether detect forging inside has and does not allow the defective that exists.
4), roughing before the modifier treatment.Be the ready work of modifier treatment.
5), modifier treatment.Make workpiece obtain necessary good mechanical properties.
6), mechanicl test.Detect whether workpiece reaches roller through the mechanical property that is obtained after the modifier treatment technical requirements.
7), semi-finishing, obtain surface of good roughness and suitable allowance for finish; Whether the surface of good roughness is used for further detecting workpiece and exists and do not allow the defective that exists and prevent that workpiece from spending the low hard surfacing crackle that produces because of surface irregularity; Suitable allowance for finish is used for eliminating the distortion that workpiece produces because of hard surfacing after body surface quenches.If allowance for finish is excessive, the significant depth of quench-hardened case after the roller precision work will be influenced; Allowance for finish is too small, can't process during roller precision work.
8), UT (Ultrasonic Testing).Whether further detect workpiece exists and does not allow the defective that exists.
9), body surface quenching, tempering.Make body surface obtain the hardness of expection, and the back interior unrelieved stress of roller of will quenching reduces to minimumly, make the roll size stable accuracy.
10), precision work.Obtain the roller of pattern illustrated dimension precision.
11), roller all surface magnetic or dye-penetrant inspection.Whether detect workpiece surface meets the requirements.
Operations such as the forging normalizing of bipyramid roller, modifier treatment adopt interchangeable heat treatment process rules and general processing units, can reach the technical requirements of bipyramid roller fully.Make improvements slightly according to the semi-finishing before roughing and the hard surfacing before the modifier treatment of roller characteristics pair of rollers.Rough machined purpose is to remove the oxide skin and the Decarburized layer on forging surface before the modifier treatment, and the wedge angle rounding avoids stress concentration to cause hardening break.Roughing before the modifier treatment is at the monolateral 20～30mm process redundancy of shaft head fractionation, so that add the thermo-welding suspender when modified and body surface quenching, tempering.Semi-finishing before the hard surfacing: during semi-finishing, roller body surface quenching front surface roughness is not less than Ra3.2, the monolateral allowance for finish that stays 1mm～1.2mm of roller body of roll hardened face part, the spindle nose part is only carried out the cutter correction, each wedge angle rounding, avoid stress concentration, cause hardening break.Whether the surface of good roughness is used for further detecting workpiece and exists and do not allow the defective that exists and prevent that workpiece from spending the low hard surfacing crackle that produces because of surface irregularity; Suitable allowance for finish is used for eliminating the distortion that workpiece produces because of hard surfacing after body surface quenches.The correction of spindle nose part cutter is convenient to weld suspender.
To the structural analysis of sheet strip hot rolling mill conveyor roller bipyramid roller as can be known, sheet strip hot rolling mill conveyor roller bipyramid big end of roller cone and end diameter difference big (〉=100mm), the spindle nose portion size is less; The final heat treatment hardness of body surface is HRC49-52; According to the body of roll scantlings of the structure of bipyramid roller, make different heating intensities and identical heat-up time each surface of the body of roll reach identical quenching temperature and identical depth of penetration heating simultaneously by adopting to each section (as shown in Figure 2) of bipyramid roller.
1st, 5 heated zones--the spindle nose portion size is less, does not need that hard surfacing and body surface quench, after tempering finishes, and each parameter of mechanical property of spindle nose part is not subjected to that body surface quenches, tempered influences; With the Heating temperature of this section be provided with lower, the Heating temperature in this district of process furnace is set in 750 ℃～760 ℃ to material 45 steel; Material 42CrMo steel is set in 770 ℃～780 ℃; And adopt refractory fibre and refractory fiber cloth that the shaft head branch is wrapped up, make the spindle nose part not by direct heating.
2nd, 4 heated zones are the body of roll part near spindle nose, because its diameter is bigger, to in the identical time, reach the surface temperature of unanimity and identical diathermanous layer depth with smaller-diameter portion, with the Heating temperature of this section be provided with higher, the Heating temperature of this section of process furnace is set in 870 ℃～880 ℃ to material 45 steel, and material 42CrMo steel is set in 890 ℃～900 ℃.
The 3rd heated zones, its diameter is slightly little than the roll diameter of the 2nd, 4 heated zones, and the temperature than the 2nd, 4 heated zones that the Heating temperature of this section is provided with is low slightly, and the Heating temperature of this section of process furnace is set in 850 ℃～860 ℃ to material 45 steel; Material 42CrMo steel is located at 870 ℃～880 ℃.
The present invention is when carrying out quenching heat treatment to sheet strip hot rolling mill conveyor roller bipyramid roller, the bipyramid roller is divided into five different heated zones and takes different Heating temperatures respectively according to the structure of each section, thereby guarantee in identical heat-up time, to reach the temperature and the depth of penetration heating consistence of whole body surface, make the back body surface hardness of quenching even, reach the technical requirements of design.
For (requiring the final heat treatment hardness of body surface is HRC49-52, and penetration of hardness 4～7mm) is avoided quenching crack, reduces quenching strain, selects water-oily interrupted quenching technology when obtaining suitable quenching hardness and enough quench-hardened cases.Workpiece cools off fast when guarantee quenching, and selects to have temperature controlled quenching liquid bath, and the temperature of hardening liquid is controlled at best speed of cooling scope (50 ℃～60 ℃ of the temperature of hardening liquid), with the hardness that obtains to suit and darker quench-hardened case.The external cooling system of quenching liquid bath is adopted in the control of quench fluid temperature.The recycle pump of cooling system extracts the hardening liquid of heat from quenching liquid bath top, after the water cooler cooling by external cooling system, be back to the quenching liquid bath respectively around the quenching liquid bath along roll body length, plays the temperature control to hardening liquid in the quenching liquid bath.For avoiding quenching crack, reduce quenching strain, workpiece is chilled to the temperature (300 ℃～400 ℃) of a little higher than MS in the water quality hardening liquid, changes over to immediately to continue cooling in the more weak oily medium of cooling power.Otherwise, will cause the workpiece hardening break.
After the body surface of sheet strip hot rolling mill conveyor roller bipyramid roller quenches, when in oily medium, continuing to be cooled to 140 ℃～150 ℃, detect the body surface hardness of bipyramid roller.Select tempering temperature according to the hardness after quenching.Material 45 steel are selected between 240 ℃～320 ℃; Material 42CrMo steel is selected between 280 ℃～380 ℃, to obtain the final heat treatment hardness HRC45 of the body of roll～49 that pattern requires.Minimum for the unrelieved stress after the inner quenching of workpiece is reduced to as much as possible, tempering time is selected in 24～30 hours.Otherwise the roll size precision after the precision work can not be steady in a long-term.
Through tempering, after the final heat treatment hardness of body surface reaches HRC45～49, carry out the precision work of sheet strip hot rolling mill conveyor roller bipyramid roller, select the lathe of small tool energy self-acting feed for use, adopt two sections conical section of compound self-acting feed processing bipyramid roller, or two sections conical section and all the other each ones of directly adopting large-sized numerical control lathe precision work bipyramid roller.After each one of bipyramid roller reached the pattern size accuracy requirement, the roller all surface carried out magnetic or dye-penetrant inspection, detected whether coincidence pattern requirement of workpiece surface.
The large-scale bipyramid roller of processing method processing of the present invention; because rationally the selecting for use of choose reasonable, surfaceness, the spindle nose having taked the body of roll of sheet strip hot rolling mill conveyor roller bipyramid roller different diameter to be carried out effective control, the allowance for finish of brine quenching liquid temp in the control, water-oily double quenching technology, quenching tank of subregion heating intensity take suitable protection, tempering temperature and tempering time reasonably to select for use; concrete enforcements by to nearly 300 large-scale bipyramid roller manufacturings obtain following result:
1) the body surface hardness of bipyramid roller is even, and hardness is: HRC46～49.
2) the body surface depth of hardening zone unanimity of bipyramid roller, effective depth of hardening is: 4～6mm.
3) between quench-hardened case and non-quench-hardened case tangible transition layer is arranged, the transition layer degree of depth 8～10mm.
4) mechanical property and the hardness at the spindle nose of bipyramid roller and non-quenching position still keep the preceding state that quenches, fully the technical requirements of coincidence pattern.
5) bulk deformation was little after the bipyramid roller quenched, and every meter only is: 0.2～0.4mm.
Description of drawings
Fig. 1 is a conveyor roller bipyramid roller structure synoptic diagram.
Fig. 2 is a conveyor roller bipyramid roller surfaces quenching heating subregion synoptic diagram.
Among the figure, 1,3, spindle nose, 2, the body of roll, 3,1 heating zone, 4,2 heating zone, 5,3 heating zone, 6,4 heating zone, 7,5 heating zone.
Embodiment
Provide the embodiment of the invention, the present invention be illustrated, but do not constitute any limitation of the invention:
According to the constructional feature and the technical requirements of sheet strip hot rolling mill conveyor roller bipyramid roller, determine that the complete processing of sheet strip hot rolling mill conveyor roller bipyramid roller is:
1), at first, select the forging machine tool rough forging of suitable tonnage, forging ratio must not be less than 3.5.So that obtain the equally distributed good forging of chemical ingredients.Otherwise the uneven chemical components distribution can cause the inhomogeneous of body surface quenching hardness.The material employing 45 or the 42CrMo of conveyor roller bipyramid roller.
2), normalizing treatment is adopted in the first road thermal treatment of forging.Purpose is to make whole forging obtain the weave construction of even refinement, for element task is carried out in the further thermal treatment of workpiece, comprise the rapid heating operation that body surface quenches, because rate of heating not only depends on the carbon content of material, the size of workpiece original structure granularity also is a key factor, granularity is more little, and rate of heating is fast more.The normalizing operation is chosen conventional normalizing process parameter according to material and is carried out in pit furnace.
The normalizing process parameter:
45：
During furnace temperature～500 ℃, the workpiece of packing into, 60 ℃～70 ℃/hour of rate of heating; During furnace temperature～700 ℃, insulation is 2 hours when 90 ℃～100 ℃/hour of rate of heating, furnace temperature to 860 ℃, the air cooling of coming out of the stove.
42CrMo：
During furnace temperature～500 ℃, the workpiece of packing into, 60 ℃～70 ℃/hour of rate of heating; During furnace temperature～700 ℃, insulation is 2 hours when 90 ℃～100 ℃/hour of rate of heating, furnace temperature to 870 ℃, the air cooling of coming out of the stove.
3), the workpiece after the normalizing and then carries out UT (Ultrasonic Testing).Whether detect forging has unallowed defective to exist.
4), carry out roughing before the modifier treatment through the qualified workpiece of UT (Ultrasonic Testing) after the normalizing.Purpose is to remove the oxide skin and the Decarburized layer on forging surface.The wedge angle rounding is avoided stress concentration, causes hardening break.At the monolateral 20～30mm allowance for finish of shaft head fractionation, so that when modified and body surface quenching, tempering, add the thermo-welding suspender.
5), modifier treatment.In pit furnace, quench and the tempered heating process for reducing distortion, choose conventional hardening and tempering process parameter according to material and in pit furnace, carry out.
The hardening and tempering process parameter:
45：
During furnace temperature～500 ℃, the workpiece of packing into, 60 ℃～70 ℃/hour of rate of heating; During furnace temperature～700 ℃, insulation is 2 hours when 90 ℃～100 ℃/hour of rate of heating, furnace temperature to 880 ℃.
Come out of the stove and carry out the tank quenching.
Carry out 560 ℃ of tempering, tempering time is selected in 8 hours.
42CrMo：
During furnace temperature～500 ℃, the workpiece of packing into, 60 ℃～70 ℃/hour of rate of heating; During furnace temperature～700 ℃, insulation is 2 hours when 90 ℃～100 ℃/hour of rate of heating, furnace temperature to 890 ℃.
Come out of the stove and carry out the oil groove quenching.
Carry out 580 ℃ of tempering, tempering time is selected in 8 hours.
6), pair of rollers sampling, carry out mechanicl test.
7), by mechanicl test, qualified workpiece carries out body of roll semi-finishing, so that make the body of roll obtain surface of good roughness and suitable allowance for finish.During semi-finishing, roller body surface quenching front surface roughness is not less than Ra3.2, the monolateral allowance for finish that stays 1mm～1.2mm of roller body of roll hardened face part, the spindle nose part is only carried out the cutter correction, each wedge angle rounding is avoided stress concentration, causes hardening break.Whether the surface of good roughness is used for further detecting workpiece and exists and do not allow the defective that exists and prevent that workpiece from spending the low hard surfacing crackle that produces because of surface irregularity; Suitable allowance for finish is used for eliminating the distortion that workpiece produces because of hard surfacing after body surface quenches.The correction of spindle nose part cutter is convenient to weld suspender.
8) carry out UT (Ultrasonic Testing) before, body surface quenches.Whether further detect workpiece exists and does not allow the defective that exists.
9), the qualified bipyramid roller of flaw detection is at one section used suspender of spindle nose position welding heating, with the refractory fibre of refractory fiber cloth and about 120mm thickness with the spindle nose parcel at roller two ends tightly.
10), body surface quenching, tempering.Make body surface obtain the hardness of expection, and the back interior unrelieved stress of roller of will quenching reduces to minimumly, make the roll size stable accuracy.
At first, the pit furnace that will be used to heat is preheated to 680 ℃～700 ℃, the bipyramid roller that hot stove is packed into and welded suspender.Get 5 subregions by body of roll scantlings of the structure, carry out the adjustment of pit furnace regional temperature according to the bipyramid roller:
As shown in Figure 2, the 1st, 5 heated zones-spindle nose part, size is less, does not need that hard surfacing and body surface quench, after tempering finishes, and each parameter of mechanical property of spindle nose part is not subjected to that body surface quenches, tempered influences.With the Heating temperature of this section be provided with lower, the Heating temperature in this district of process furnace is set in 750 ℃～760 ℃ to material 45 steel, and material 42CrMo steel is set in 770 ℃～780 ℃; And adopt refractory fibre and refractory fiber cloth that the shaft head branch is wrapped up, make the spindle nose part not by direct heating.
2nd, 4 heated zones are near the body of roll part of spindle nose, because its diameter is bigger, to in the identical time, reach consistent surface temperature and diathermanous layer depth with smaller-diameter portion, with the Heating temperature of this section be provided with higher, the Heating temperature in this district of process furnace is set in 870 ℃～880 ℃ to material 45 steel, and material 42CrMo steel is set in 890 ℃～900 ℃.
The 3rd heated zones, its diameter is slightly little than the roll diameter of the 2nd, 4 heated zones, the temperature than the 2nd, 4 heated zones that the Heating temperature of this section is provided with is low slightly, the Heating temperature in this district of process furnace is set in 850 ℃～860 ℃ to material 45 steel, and material 42CrMo steel is located at 870 ℃～880 ℃.
Adjust the burner hearth temperature rise speed, heat up with 70 ℃～100 ℃/hour speed, make burner hearth respectively distinguish temperature and suitable insulation that temperature rises to setting, heat-up time and soaking time summation are maintained at about 130～135 minutes.
The workpiece of heating is come out of the stove, and removes the refractory fibre of roller two spindle nose coated outside, roller is sunk to vertically, fast, stably in 10% the sodium-chlor quenching solution, and turning of work piece slowly quickens breaking of workpiece surface steam film then.When the temperature of hardening liquid in the quenching tank rise to～during 60 ℃ of left and right sides, open the external cooling system of quenching tank, the recycle pump of cooling system extracts the hardening liquid of heat from quenching liquid bath top, after the water cooler cooling by external cooling system, hardening liquid is back to the quenching liquid bath respectively along roll body length around the quenching liquid bath, play control, improve the cooling power of hardening liquid, guarantee penetration of hardness quench fluid temperature in the quenching tank.When workpiece is chilled to the temperature (300 ℃～400 ℃) of a little higher than MS, about 25～30 minutes consuming time.Change over to immediately and continue cooling in the more weak oily medium of cooling power.Otherwise, will cause the workpiece hardening break.
When in oily medium, continuing to be cooled to 145 ℃, detect the body surface hardness of bipyramid roller.
Selecting tempering temperature according to the hardness after quenching, is 280 ℃ to material 45 steel, is 300 ℃ to material 42CrMo steel, to obtain the final heat treatment hardness HRC45 of the body of roll～49 that pattern requires.Minimum for the unrelieved stress after the inner quenching of workpiece is reduced to as much as possible, tempering time is selected in 28 hours.
11), precision work.Obtain the roller of pattern illustrated dimension precision.
Through tempering, after the final heat treatment hardness of body surface reaches HRC45～49, carry out the precision work of sheet strip hot rolling mill conveyor roller bipyramid roller.Select the lathe of small tool energy self-acting feed for use, adopt two sections conical section of compound self-acting feed processing bipyramid roller, or two sections conical section and all the other each ones of directly adopting large-sized numerical control lathe precision work bipyramid roller.
12), after each one of bipyramid roller reaches the pattern size accuracy requirement, the pair of rollers all surface carries out magnetic or dye-penetrant inspection.Detect whether coincidence pattern requirement of workpiece surface.
Claims (4)
1. the producing and manufacturing technique of a large-sized strip hot rolls conveyor roller bipyramid roller, the step of its production technique mainly comprises: rough forging forging normalizing treatment, UT (Ultrasonic Testing), roughing before the modifier treatment, modifier treatment, semi-finishing, body surface quenches, tempering, precision work and roller all surface magnetic or dye-penetrant inspection; It is characterized in that: in body surface quenching, tempering process, body of roll scantlings of the structure according to the bipyramid roller, the bipyramid roller is divided into different heated zones and according to the structure of each section to each section of bipyramid roller by adopting different heating intensity and the mode of identical heat-up time, so that each surface of the body of roll reaches identical quenching temperature and identical depth of penetration heating simultaneously; 1st, the Heating temperature of 5 heated zones, one spindle nose part is set in 750 ℃～760 ℃ to material 45 steel; Material 42CrMo steel is set in 770 ℃～780 ℃, and adopts refractory fibre and refractory fiber cloth that the shaft head branch is wrapped up, make the spindle nose part not by direct heating; 2nd, 4 heated zones-material 45 steel are set in 870 ℃～880 ℃ near the Heating temperature of the body of roll of spindle nose part are set in 890 ℃～900 ℃ to material 42crMo steel; The Heating temperature of the 3rd heated zones is set in 850 ℃～860 ℃ to material 45 steel, and material 42CrMO steel is located at 870 ℃～880 ℃; For when obtaining suitable quenching hardness and enough quench-hardened cases, avoiding quenching crack, reduce quenching strain, take water-oily interrupted quenching technology, workpiece cools off fast when quenching for assurance, employing has temperature controlled quenching liquid bath, the temperature of hardening liquid is controlled at 50 ℃～60 ℃, obtains suitable hardness and darker quench-hardened case; The external cooling system of quenching liquid bath is adopted in the control of quench fluid temperature; The recycle pump of cooling system extracts the hardening liquid of heat from quenching liquid bath top, after the water cooler cooling by external cooling system, be back to quenching tank respectively around quenching tank along roll body length, plays the temperature control to hardening liquid in the quenching tank; For avoiding quenching crack, reduce quenching strain, workpiece is chilled to 300 ℃～400 ℃ of the temperature of a little higher than Ms in the water quality hardening liquid, changes over to immediately to continue cooling in the more weak oily medium of cooling power, to avoid causing the workpiece hardening break; After the body surface of sheet strip hot rolling mill conveyor roller bipyramid roller quenches, in oily medium, continue to be cooled to 140 ℃～150 ℃, detect the body surface hardness of bipyramid roller, select tempering temperature, material 45 steel are chosen between 240 ℃～320 ℃ according to the hardness after quenching; Material 42CrMo steel is chosen between 280 ℃～380 ℃, to obtain the final heat treatment hardness HRC45 of the body of roll～49 that pattern requires; Minimum for the unrelieved stress after the inner quenching of workpiece is reduced to as much as possible, tempering time is selected in 26～30 hours, with the roll size precision long-term stability after the maintenance precision work.
2. the producing and manufacturing technique of large-sized strip hot rolls conveyor roller bipyramid roller according to claim 1, it is characterized in that: carry out before the modifier treatment in the roughing operation at the monolateral 20～30mm allowance for finish of shaft head fractionation through the qualified workpiece of UT (Ultrasonic Testing) after the normalizing, so that quench, add during tempering the thermo-welding suspender at modified and body surface.
3. the producing and manufacturing technique of large-sized strip hot rolls conveyor roller bipyramid roller according to claim 1, it is characterized in that: workpiece is carried out in the body of roll semi-finishing operation, roller body surface quenching front surface roughness is not less than Ra3.2, the monolateral allowance for finish that stays 1mm～1.2mm of body of roll part, the spindle nose part is only carried out the cutter correction, each wedge angle rounding is avoided stress concentration, causes hardening break.
4. the producing and manufacturing technique of large-sized strip hot rolls conveyor roller bipyramid roller according to claim 1, it is characterized in that: workpiece is carried out in the hard surfacing treatment process, unlikely too high for guaranteeing that the body surface temperature reaches quenching temperature body of roll internal temperature, improve rate of heating, when furnace temperature reached 680 ℃～700 ℃, workpiece carried out the shove charge of hard surfacing heating.
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