CN102260771B - Vertical resistance-band rapid heating furnace - Google Patents
Vertical resistance-band rapid heating furnace Download PDFInfo
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- CN102260771B CN102260771B CN 201110227046 CN201110227046A CN102260771B CN 102260771 B CN102260771 B CN 102260771B CN 201110227046 CN201110227046 CN 201110227046 CN 201110227046 A CN201110227046 A CN 201110227046A CN 102260771 B CN102260771 B CN 102260771B
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Abstract
The invention relates to rapid heating equipment used for carrying out surface hardening heat processing on roller bodies of a supporting roller and other large rollers, wherein the supporting roller is used for bearing rolling force and on a metal band rolling mill. A vertical resistance- band rapid heating furnace is provided with a furnace body (9) and a base (18), wherein the furnace body is vertically arranged on the base; the furnace body consists of a furnace floor (15), a furnace chamber and a furnace cover (14); the furnace chamber is internally divided into a upper part region (11), a middle part region (12) and a lower part region (13); each internal wall of the furnace chamber of each region is respectively provided with a resistance-band heating element (10); the resistance-band heating element is connected with a controller; each region is provided with a thermocouple used for measuring temperature; the thermocouple output is connected with the controller; the middle of the furnace floor and the middle of the furnace base are hollow; the furnace cover has a open-type; and the middle of the furnace cover is provided with a circular hole. The heating furnace provided by the invention has the advantages of simple structure, low investment and small occupation area and is dedicated to the rapid heating of the surface layer of the roller body of the supporting roller.
Description
Technical field
The present invention relates to a kind of rapid-heating device, relate in particular to a kind of support roll for bearing rolling load on the metal plate and belt milling train and other large-scale roller body surfaces heat treated rapid-heating device that hardens.
Background technology
Because iron and steel and non-ferrous metal strip processing industry are fast-developing, to the rapid growth that demand and the mill parts of processing strip-mill strip consumes, also at double increase of the consumption of support roll.Support roll is the vitals in the strip-mill strip, and its manufacturing technology difficulty is large, and the production cycle is long, is the high-tech product in the machinery manufacturing industry.The key technical indexes of support roll has two aspects, and the one, the hardness in body surface district, such as Fig. 1 support roll sketch, wherein 1 district is the body surface district, this district is the high rigidity district.Old-fashioned milling train requires this district Shore hardness HS 55～65 with support roll, and Modern Rolling Mill requires HS 65～75, requires in addition uniformity of hardness, and it is≤4HS that Modern Rolling Mill is≤2～3 HS that old-fashioned milling train requires uniformity of hardness with support roll.Uniformity of hardness refers to that any difference of hardness of the body of roll is not more than 4HS or is not more than 2 or 3HS at 2.The 2nd, the degree of depth of body surface district hardened layer, the degree of depth in 1 district among Fig. 1, old-fashioned milling train requires 20～30 millimeters deep with support roll, and Modern Rolling Mill requires 40～60 millimeters deep, and Modern Rolling Mill has improved 1 times than old-fashioned milling train.These requirements depend primarily on the hard surfacing heat penetration except outside the Pass having with steel for backup roller, and the depth of heat penetration then depends on the state of the art of rapid-heating device.
Rapid-heating device is mainly two classes both at home and abroad at present.One class power frequency supply induction heating, Fig. 2 are continous way line-frequency induction heating quenching synoptic diagram; Continous way line-frequency induction heating quenching equipment is to heat by load coil 4 breaker rolls 8, and its disadvantage is that the zone of heating degree of depth is not enough, can only accomplish the hardened layer of 20～30 millimeters deep.Another kind of is the flame-type gas-operated thermal bath facility, and Fig. 3 is the synoptic diagram of heating unit for this reason; Heated roll 8 is placed on the rotation tugboat 6 on both sides, and tugboat can drive roll rotation, and wheel body both sides are that two row's combustion gas are burnt and chewed 7, burns to chew burned flame and be ejected into roll surface and heat; The shortcoming of this kind heating unit is the lack of homogeneity of Heating temperature, and the uniformity of hardness after the quenching is bad.The common deficiency of these two kinds of devices is primary device and auxiliary facility more complicated, and floor space is large, investment is high.
Summary of the invention
The object of the present invention is to provide a kind of vertical resistance-band rapid heating furnace, this heating furnace structure is simple, less investment, and floor space is little, is exclusively used in the rapid heating of support roll body surface layer.
To achieve these goals, the present invention adopts following technical scheme:
A kind of vertical resistance-band rapid heating furnace, comprise body of heater and pedestal, body of heater vertically is installed on the pedestal, body of heater is comprised of furnace bottom, burner hearth and bell, be divided into upper zone, middle region and lower region in the burner hearth, on each regional inboard wall of burner hearth the resistive band Heating element be installed all, the resistive band Heating element connects controller, thermopair is installed to measure temperature in each zone, thermopair output connects controller; Be hollow in the middle of furnace bottom centre and the pedestal, bell is open-type, has circular hole in the middle of the bell.
Can vertically put into the support roll that need to carry out the heating of body surface district in the described body of heater, the support roll bottom rests on the middle hollow bulb of furnace bottom, the sealing of lower support circle is housed between support roll and furnace bottom, the sealing-ring sealing is housed between the roll neck section of bell interstitial hole and support roll.
The heat-up rate of described support roll in burner hearth is relevant with furnace diameter D and height H, and be relevant with surface of burner hearth power, relevant with the size that is heated the support roll body of roll.
Described furnace diameter is that 2.60 meters, furnace height are 2.60 meters, surface of burner hearth is long-pending to be 21.24 square metres, surface of burner hearth power is 18～20 kilowatts/square metre, the burner hearth total power is 400 kilowatts, corresponding support roll roll diameter is 0.70～1.20 meter, roll body length is 1.00～2.00 meters, and body surface is long-pending to be 2.20～7.54 square metres.
Described furnace diameter is that 3.00 meters, furnace height are 3.00 meters, surface of burner hearth is long-pending to be 28.27 square metres, surface of burner hearth power is 18～20 kilowatts/square metre, the burner hearth total power is 550 kilowatts, corresponding support roll roll diameter is 1.20～1.60 meters, roll body length is 1.40～2.30 meters, and body surface is long-pending to be 5.28～11.56 square metres.
Process furnace of the present invention adopts the vertical resistance-band heating, be exclusively used in the rapid heating of support roll body surface layer, the good airproof performance furnace temperature of burner hearth is easy to control, as long as heating reaches the purpose that certain speed that is rapidly heated just can be accomplished the upper layer heating through test of many times proof resistive band, heat penetration can be controlled in 30～80 millimeters, and the hardness of hardened face layer can reach Shore hardness HS60～80 scopes.
Heating furnace structure of the present invention is simple, less investment, and floor space is little, is exclusively used in the rapid heating of support roll body surface layer.
Description of drawings
Fig. 1 support roll sketch;
Fig. 2 continous way line-frequency induction heating quenching synoptic diagram;
Fig. 3 flame-type gas-fired heater;
Fig. 4 support roll body of roll principal dimension figure;
Fig. 5 support roll surface region heating process curve;
Fig. 6 vertical resistance-band rapid heating furnace structural representation;
Fig. 7 embodiment 1 support roll figure;
Fig. 8 embodiment 1 quenching technology for surfaces;
Fig. 9 embodiment 2 support roll figure;
Figure 10 embodiment 2 quenching technology for surfaces.
Among the figure: 1 body surface district, 2 intermediate zones, 3 roll neck districts, 4 load coils, 5 water-jets, 6 rotate tugboat, and 7 combustion gas are burnt and are chewed, 8 support rolls, 9 bodies of heater, 10 resistive band Heating elements, 11 upper furnace districts, 12 burner hearth middle region, 13 lower furnace portion districts, 14 bells, 15 furnace bottoms, sealed picture on 16,17 lower support circles, 18 pedestals, 19 ground.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 6, a kind of vertical resistance-band rapid heating furnace, comprise body of heater 9 and pedestal 18, body of heater 9 vertically is installed on the pedestal 18, pedestal 18 is fixed on ground 19, body of heater 9 is comprised of furnace bottom 15, burner hearth and bell 14, be divided into upper zone 11, middle region 12 and lower region 13 in the burner hearth, on each regional inboard wall of burner hearth resistive band Heating element 10 is installed, each resistive band Heating element 10 connects controller and controls separately, thermopair is installed to measure temperature in each zone, thermopair output connects controller; Be hollow in the middle of furnace bottom 15 centres and the pedestal 18, bell 14 is open-type, has circular holes in the middle of the bell 14.
Described body of heater 9 interior can vertically putting into need to be carried out the support roll 8 that heat in the body surface district, support roll 8 bottoms rest on the hollow bulb of furnace bottom 15 centres, 15 pads of support roll 8 and furnace bottom are equipped with 17 sealings of lower support circle, sealing-ring 16 sealings are housed between the roll neck section of bell interstitial hole 14 and support roll 8, and upper sealing-ring 16 is sleeved in bell 14 interstitial holes.
Vertical resistance-band rapid heating furnace of the present invention is exclusively used in the rapid heating of support roll body surface layer, can heat body of roll diameter of phi=0.70～1.60 meter, the roll of roll body length L=1.00～2.30 meter.Zone of heating degree of depth δ is 40～80 millimeters, as shown in Figure 4.The maximum heating temperature of this process furnace is 910 ℃, can satisfy the support roll hard surfacing heating of whole grade of steel manufacturings of stipulating in the steel for backup roller standard and use.Fig. 5 is the support roll body surface district heat treated heating process curve that hardens, be warming up to 900 ℃ from 550 ℃ as we know from the figure and be rapid heating, its rate of heating be 〉=90 ° C/ hour.
Through many-sided experimental study as can be known, can reach rapid heating in C/ hour for 〉=90 ° when the body surface heat-up rate.This speed is called critical rate of heating, is greater than or equal to the purpose that this speed intensification can realize the surface region heating.
Vertical resistance-band rapid heating furnace of the present invention can carry out rapid heating to support roll body surface layer.The heat-up rate of the support roll body of roll in burner hearth is relevant with furnace diameter D and height H, and be relevant with surface of burner hearth power (power of per surface area heating), relevant with the size that is heated the support roll body of roll.The relation of the size of burner hearth of rapid heating furnace of the present invention and power and body of roll size is selected according to the relational expression of table 1 referring to table 1, support roll body surface heat-up rate can be reached 〉=90 ° C/ hour, thereby reach the purpose of rapid heating.
Body of roll case depth h(millimeter) (referring to Fig. 1) is the important indicator of support roll technical feature.Case depth and heat penetration have certain relation.Zone of heating degree of depth δ (millimeter) (referring to Fig. 4) is equal to or greater than case depth h(Fig. 1).Zone of heating degree of depth δ is relevant with the soaking time that the body of roll is heated rapidly to after 900 ℃, and the longer zone of heating degree of depth of soaking time is darker.Table 2 is the zone of heating degree of depth of rapid heating furnace of the present invention and the relation of soaking time.The length of the soaking time after the Heating temperature (900 ℃) is decided by the zone of heating degree of depth, as shown in Figure 5.The relation of zone of heating degree of depth δ and soaking time is as shown in table 2.
Embodiment 1
2 support roll sizes as shown in Figure 7, roll diameter Φ 1280mm, roll body length L 1350mm, single-piece weighs 20.47 tons and carries out body surface and quench.Material Used in Supporting Roll is the 70Cr3Mo steel, and the actual quenching of the body of roll is of a size of Φ 1283mm, and long 1360mm, diameter are put the 3mm grinding tolerance, and length is put 10mm process redundancy.Hardness of roll body requires HS 65～70. depths of hardening zone to be 〉=45mm uniformity of hardness HS≤3.
This hard surfacing is 2.6 meters with the furnace diameter D of rapid heating furnace, and the shaft height H is 2.6 meters.Fig. 8 is this heat treatment cycle curve, and support roll for the first time preheating temperature is 300 ℃ of insulations 8 hours, and preheating temperature is 550 ℃ of soaking times 20 hours for the second time.Be rapid heating from 550 ℃ to 900 ℃, rate of heating is 90 ℃/hour.Insulation was 3 hours after the body of roll arrived 900 ℃, then quenched.In 430 ℃ of tempering 140 hours, stove was as cold as 150 ℃ and comes out of the stove after quenching.
Body of roll Shore hardness is that HS 67～69 hardness are qualified after testing, and uniformity of hardness HS=3 is also qualified.Body of roll layer depth of the heating degree is also measured, and actual measurement zone of heating degree of depth δ is 60mm, estimates that case depth h can surpass 45mm, and it is qualified that this processes support roll.
2 support roll sizes as shown in Figure 9.Roll diameter Φ 752 roll body lengths 1690, single-piece weighs 7.5 tons.Material Used in Supporting Roll is the 9Cr2Mo steel.Hardness of roll body requires HS 75～80.Depth of hardening zone 〉=30mm, uniformity of hardness HS≤3.
This hard surfacing is 2.60 meters with the furnace diameter D of rapid heating furnace, and the shaft height H is 2.60 meters.Figure 10 is this process of thermal treatment curve, and the support roll preheating temperature is 300 ℃ of insulations 5 hours, and 540 ℃ are incubated 10 hours.Be rapid heating from 540 ℃ to 900 ℃, rate of heating is 100 ℃/hour.Insulation was 1.5 hours after body surface arrived 900 ℃.Then quench.In 320 ℃ of tempering, be incubated 80 as a child after quenching, stove is as cold as 150 ℃ and comes out of the stove.
Be 78～80 through inspection side body of roll Shore hardness, hardness is qualified.Uniformity of hardness HS=3 is also qualified.Body of roll zone of heating degree of depth δ is 40mm, estimates that case depth h can surpass 30mm, and it is qualified that this processes support roll.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention, therefore, all any modifications of doing within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. vertical resistance-band rapid heating furnace, comprise body of heater (9) and pedestal (18), body of heater (9) vertically is installed on the pedestal (18), body of heater (9) is comprised of furnace bottom (15), burner hearth and bell (14), it is characterized in that: be divided into upper zone (11), middle region (12) and lower region (13) in the burner hearth, resistive band Heating element (10) all is installed on each regional inboard wall of burner hearth, resistive band Heating element (10) connects controller, thermopair is installed to measure temperature in each zone, thermopair output connects controller; Be hollow in the middle of furnace bottom (15) centre and the pedestal (18), bell (14) is open-type, has circular hole in the middle of the bell (14);
Can vertically put into the support roll (8) that need to carry out the heating of body surface district in the described body of heater (9), in the hollow bulb that the roll neck district (3) of support roll (8) bottom stretches in the middle of the furnace bottom (15) and pedestal is middle, lower support circle (17) sealing is housed between the body of roll side of support roll (8) and furnace bottom (15) and by furnace bottom (15) supporting, sealing-ring (16) sealing is housed between the roll neck section of bell (14) interstitial hole and support roll (8);
The heat-up rate of described support roll in burner hearth is relevant with furnace diameter D and height H, and be relevant with surface of burner hearth power, relevant with the size that is heated the support roll body of roll; Be specially:
Described furnace diameter is that 2.60 meters, furnace height are 2.60 meters, surface of burner hearth is long-pending to be 21.24 square metres, surface of burner hearth power is 18～20 kilowatts/square metre, the burner hearth total power is 400 kilowatts, corresponding support roll roll diameter is 0.70～1.20 meter, roll body length is 1.00～2.00 meters, and body surface amasss and carries out the surface region heating quenching when being 2.20～7.54 square metres;
When support roll body surface heat-up rate is 〉=90 ℃/hour, can realize that vertical resistance-band rapid heating furnace carries out rapid heating to the support roll surface region; The support roll body of roll is heated rapidly to 900 ℃ of insulations, and heat penetration is 40 ~ 80 millimeters.
2. vertical resistance-band rapid heating furnace, comprise body of heater (9) and pedestal (18), body of heater (9) vertically is installed on the pedestal (18), body of heater (9) is comprised of furnace bottom (15), burner hearth and bell (14), it is characterized in that: be divided into upper zone (11), middle region (12) and lower region (13) in the burner hearth, resistive band Heating element (10) all is installed on each regional inboard wall of burner hearth, resistive band Heating element (10) connects controller, thermopair is installed to measure temperature in each zone, thermopair output connects controller; Be hollow in the middle of furnace bottom (15) centre and the pedestal (18), bell (14) is open-type, has circular hole in the middle of the bell (14);
Can vertically put into the support roll (8) that need to carry out the heating of body surface district in the described body of heater (9), in the hollow bulb that the roll neck district (3) of support roll (8) bottom stretches in the middle of the furnace bottom (15) and pedestal is middle, lower support circle (17) sealing is housed between the body of roll side of support roll (8) and furnace bottom (15) and by furnace bottom (15) supporting, sealing-ring (16) sealing is housed between the roll neck section of bell (14) interstitial hole and support roll (8);
The heat-up rate of described support roll in burner hearth is relevant with furnace diameter D and height H, and be relevant with surface of burner hearth power, relevant with the size that is heated the support roll body of roll; Be specially:
Described furnace diameter is that 3.00 meters, furnace height are 3.00 meters, surface of burner hearth is long-pending to be 28.27 square metres, surface of burner hearth power is 18～20 kilowatts/square metre, the burner hearth total power is 550 kilowatts, corresponding support roll roll diameter is 1.20～1.60 meters, roll body length is 1.40～2.30 meters, and body surface amasss and carries out the surface region heating quenching when being 5.28～11.56 square metres;
When support roll body surface heat-up rate is 〉=90 ℃/hour, can realize that vertical resistance-band rapid heating furnace carries out rapid heating to the support roll surface region; The support roll body of roll is heated rapidly to 900 ℃ of insulations, and heat penetration is 40 ~ 80 millimeters.
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| CN 201110227046 CN102260771B (en) | 2011-08-09 | 2011-08-09 | Vertical resistance-band rapid heating furnace |
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| CN102260771B true CN102260771B (en) | 2013-04-03 |
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| CN102399952A (en) * | 2011-12-22 | 2012-04-04 | 安徽新华电子科技有限公司 | Pit-type multifunctional heat treatment furnace |
| CN104975158A (en) * | 2015-07-08 | 2015-10-14 | 江苏宇山盛佳特钢制品有限公司 | Partition independent control continuous long steel rod heat treatment furnace and process thereof |
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| CN201071380Y (en) * | 2007-08-10 | 2008-06-11 | 中国联合工程公司 | Vertical segmenting thermal treatment industry furnace |
| CN201520786U (en) * | 2009-08-19 | 2010-07-07 | 北京机电研究所 | Bottom-supported type vertical heat treatment furnace with controllable cooling rate |
| CN101754504B (en) * | 2010-01-19 | 2012-02-29 | 江苏丰东热技术股份有限公司 | Zone-control radiant tube heater |
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