CN85202609U - Continuous vacuum annealing furnace for stainless steel strip - Google Patents
Continuous vacuum annealing furnace for stainless steel strip Download PDFInfo
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- CN85202609U CN85202609U CN 85202609 CN85202609U CN85202609U CN 85202609 U CN85202609 U CN 85202609U CN 85202609 CN85202609 CN 85202609 CN 85202609 U CN85202609 U CN 85202609U CN 85202609 U CN85202609 U CN 85202609U
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Abstract
AThe utility model relates to a continuous vacuum annealing furnace for the stainless steel strip belonging to the field of the heat treatment of the stainless steel material, comprising a material feeding vacuum chamber, a furnace body, a cooling chamber and a material collecting vacuum chamber. The outer wall of the vacuum furnace tube of the main body of the furnace body is provided with a heat insulating layer and the inner portion is provided with a furnace wire tube coiled with heating wires. The stainless steel strip continuously passes through the furnace wire tube and is heated and the enters into the cooling chamber to be rapidly cooled to be coiled on the strip collection mechanism. The utility model has simple structure, convenient operation, no pollution and good performance and bright surface of the stainless steel strip after anneal.
Description
Technical field is the thermal treatment of stainless material under the utility model.
The 1Cr18Ni9 stainless strip, through press several times, roll, after the cold working such as stretching, its blank hardness increases, plasticity reduces.For this reason, must annealed softening processing just can proceed following operation, up to making daily necessities or ornaments such as resembling nib, watchband.The general annealing process of stainless strip is to be heated to earlier about 1050 ℃, quick cooling then, and this process is also named solution treatment.Surface-brightening also should be accomplished except that should evenly meeting the requirements of the mechanical property in any position of annealed stainless strip, and non-oxidation prevents carburetting, prevents that the grain boundary corrosion tendency from producing.
The annealing furnace of stainless strip both domestic and external is divided according to the atmosphere of band surrounding medium in the annealing process, has three kinds basically.A kind of is common cabinet-type electric furnace, workpiece heating anneal under the normal pressure in air, and descaling is handled in hydrofluoric acid solution then.Because it is extremely harmful to human body to produce hydrofluoric acid in handling, thereby operator's labor condition extreme difference, environmental pollution is serious.Fill with protective gas in the another kind of annealing furnace stove, for example H
2Or H
2With N
2Mixed gas or H
2With NH
3Mixed gas carries out heating anneal (seeing Japanese Patent J56044-724, United States Patent (USP) U.S.P4,334,938) to workpiece in above-mentioned gas.In protective gas, carry out heating anneal, because stove contains H
2, thereby it is inflammable and explosive, and be in metal flue under the high temperature and very easily burn or be out of shape.The third is a vacuum annealing furnace, is characterized in safe and reliable, and is free from environmental pollution, and labor condition is good, but the complicated expense height of equipment.Stainless material is heating anneal under vacuum, and at present domestic and international vacuum annealing furnace adopts the discontinuous running stove of andnon-continuous operation manner more.Also be reported under the vacuum processed continuously.United States Patent (USP) U.S.P3 for example, the heat treatment furnace of operate continuously is exactly an example under 782,705 vacuum that provide.This heat treatment furnace is by the feeding vacuum chamber, body of heater, and two cooling rooms and rewinding vacuum chamber are formed.A heating chamber is arranged in body of heater, and workpiece is heated herein, enters chilling in the cooling room that links to each other with the body of heater afterbody then.The travelling belt that a conveying workpieces is arranged in body of heater and two cooling rooms.Heating in the heating chamber and lagging material all are graphite materials.Two cooling rooms are cooled off by circulating water.Two families of power and influence respectively are housed on feeding material chamber and the rewinding chamber, and at continuous feeding, in the rewinding process, their co-ordinate motions are not destroyed the vacuum state of total system.This continuous heat treatment vacuum oven can be handled stainless steel work-piece continuously, and is easy to operate.But because the heating element and the thermoscreen of heating chamber, mainly form by graphite material, graphite easily generates carbon monoxide (CO) under vacuum, carbon in the carbon monoxide infiltrates processed workpiece surface easily, if workpiece is the 1Cr18Ni9 stainless strip, then the carbon content of stainless steel surface increases, thereby stainless steel will lose resistance to corrosion, thereby this vacuum oven should not be used for the 1Cr18Ni9 stainless strip is carried out continuous annealing.
The purpose of this utility model is to provide a kind of equipment simpler, easy to use and reliable, and furnace campaign is long, and can carry out the horizontal vacuum continuous annealing furnace of bright heat treatment continuously to stainless strip.
Main points of the present utility model are: this stainless strip vacuum continuous annealing furnace is made up of feeding vacuum chamber, body of heater, cooling vacuum chamber and rewinding vacuum chamber.The main body of body of heater is the steel vacuum boiler tube of horizontal positioned, and steel vacuum furnace tube outer wall has the thermal insulation layer of variable thickness, is intended to control the temperature of steel vacuum boiler tube.The temperature of this boiler tube is controlled at below 750 ℃, guarantees that it can long term operation.The centre of steel vacuum boiler tube is resistant to elevated temperatures furnace thread pipe, the furnace thread pipe outer wall is tied with nichrome wire, nichrome wire is wrapped up by fire-resistant tile, be placed with the vitrified pipe of ventilation heat-blocking action between this tile thermal insulation layer and steel vacuum boiler tube, to keep the temperature difference more than 300 ℃ between electric stove wire and the guiding principle matter vacuum boiler tube.A water-cooled copper plate is arranged, interior logical water coolant in the cooling room.Take-up mechanism is arranged in the rewinding vacuum chamber, and stainless strip is annealed by intravital furnace thread pipe of stove and cooling room continuously, twists in then in the take-up mechanism, and in the whole annealing process, the vacuum tightness of annealing furnace is 10
-4Temperature is 1000-1050 ℃ in the mmHg, stove.
Continuous annealing is carried out under high vacuum high temperature, require not produce in the stove to the deleterious material in stainless strip surface, so furnace thread pipe and fire-resistant tile thermal insulation layer with alumina material for well, said nichrome wire for the siderochrome aluminium nichrome wire of the OCr25Al5 through giving oxide treatment for well.
The boiler tube of vacuum continuous annealing furnace can be stainless steel seamless pipe or high temperature steel seamless tube.And the thermal insulation layer of furnace tube outer wall variable thickness is a fixedly thermal insulation layer of one deck, and fixedly thermal insulation layer has the Hough type can open and close thermal insulation layer outward, the material of thermal insulation layer with pure aluminium silicate for well.
Compared with the prior art, this device has following advantage: this device has comparatively successfully been realized stainless strip continuous annealing under vacuum by the better simply take-up of structure mechanism, and is easy to operate.Because the whole refractory-lined ovens spares in the vacuum heating chamber have adopted the high material of chemical stability under the high temperature, as through giving the Fe-Cr-Al wire of oxide treatment, can not volatilize in a vacuum yet, can not produce the deleterious material of stainless strip, thereby the strip quality after the annealing is good, and the whole stove spares in the body of heater all have very long work-ing life.Compare with annealed annealing furnace under protective gas and air, this device is safe and reliable, environmentally safe, and staff's labor condition is good.Stainless strip is annealed in the vacuum continuous annealing furnace and is compared with annealing in the muffle furnace air, is example to produce 6000000 scales of nib per year:
1 aspect the influence of environment:
In muffle furnace-air, anneal: during with the oxide skin on strap surface, hydrofluoric acid clean annealing back, produce a large amount of acid mists, influence operator ' s health and surrounding environment.1440 tons of annual quantity dischargeds, fluoride concn is that 15mg/l(exceeds standard).
In the vacuum continuous annealing furnace, anneal: anacidity, pollution-free.
2. on spent material:
In muffle furnace-air, anneal: the hydrofluoric acid moon consumption be 20kg, annual consumption is 240kg, is worth 2640 yuan.The vitriolic annual consumption is 1200kg, is worth 840 yuan.The annual consumption of nitric acid is 600kg, and value is 288 yuan.
Anneal in the vacuum continuous annealing furnace: the annual consumption of vacuum pump oil is 12kg, is worth 32 yuan.Other used material annual consumption is worth and is about 850 yuan.
3. in the metallic surface qualitatively:
Anneal in muffle furnace-air: after the acid corrosion, nib blank surface irregularity, and damage metallic surface influence the nib quality, increase rejection number, and because surface oxidation consumes stainless steel material 3% more.
In the vacuum continuous annealing furnace, anneal: surface-brightening, to metal not damaged not only, also have the vacuum stripping effect, improved the physicals of metal, improved the elasticity when nib is write.
4. aspect machinability:
Anneal in muffle furnace-air: the nib slip is heated irregular so hardness is inhomogeneous in the heating of stove mid-game dress.
Anneal in the vacuum continuous annealing furnace: because monolithic passes through tunneltron (furnace thread pipe) continuously, so the nib slip is heated evenly the hardness unanimity.
5. aspect the condition of staff's operation:
Anneal in muffle furnace-air: the tapping temperature height, during pickling, the smell is awful for acid mist, harmful.
Anneal in the vacuum continuous annealing furnace: tapping temperature is low, and Working environment is better.
Below in conjunction with accompanying drawing the vacuum continuous annealing furnace is elaborated.
Fig. 1 a is the part of the true continuous annealing furnace structure of stainless strip front section view, and the part of material-receiving system, cooling system and body of heater is arranged among the figure.
Fig. 1 b is another part of stainless strip vacuum continuous annealing furnace structure front section view, is the another part and the feed system of body of heater among the figure.
Fig. 2 is the sectional view of body of heater, is c-c sectional view among Fig. 1 a.
Fig. 3 is cooling and air-bleed system sectional view, is B-B sectional view among Fig. 1 a.
Fig. 4 is a feeding vacuum system sectional view, is D-D sectional view among Fig. 1 b.
Fig. 5 is a rewinding vacuum system sectional view, is A-A sectional view among Fig. 1 a.
It promptly is the front section view of stainless strip vacuum continuous annealing furnace that Fig. 1 a and Fig. 1 b are stitched together, and from right to left, its major parts is a feeding vacuum chamber 27, and the thermopair electrode is drawn chamber 23 and 9, body of heater 13, cooling and aspirating chamber 7, rewinding vacuum chamber 2.Whole annealing process is 10
-4Carry out continuously under the vacuum of mmHg.When body of heater 13 internal temperatures reach 1000-1050 ℃, twist in the stainless steel tape 4 on the tape mechanism in the feeding vacuum chamber 27, in rewinding vacuum chamber 2 under the drive of rolling-up mechanism, evenly by body of heater 13 centers, in this place's heating, enter cooling aspirating chamber 7 then, steel band is rolled onto in the take-up mechanism by quick cooling again.After one dish stainless steel tape is all annealed, close high vacuum valve, be full of air in the stove, can from rewinding vacuum chamber 2, take out.Load onto the new tape 4 of a dish at feeding vacuum chamber 27, vacuumize and make vacuum tightness reach 10 again
-4MmHg carries out tape transport annealing then, this process with say previously identical.
Body of heater 13 is main bodys of stainless strip vacuum continuous annealing furnace, as Fig. 1 a, Fig. 1 b and shown in Figure 2.Body of heater 13 is by vacuum boiler tube 16, fixing thermal insulation layer 15 and can open and close thermal insulation layer 14 and form.The thermal insulation layer material is an aluminum silicate fiber.The vacuum boiler tube adopts the 1Cr18Ni9 gapless stainless steel tube.When annealing, be in vacuum state in the vacuum boiler tube.Fixedly thermal insulation layer 15 is to make vacuum boiler tube 16 pipe surface temperatures maintain 750 ℃ with the effect that can open and close thermal insulation layer 14, makes vacuum boiler tube 16 that enough intensity be arranged under this temperature, and is indeformable in the prolonged operation, not scaling of surface.In the centre of vacuum boiler tube 16 furnace thread pipe 19 is housed, it is a kind of aluminium sesquioxide vitrified pipe, and thermopair 20 is housed in the pipe, is used for measuring and the interior temperature of control stove.In annealing process, homo(io)thermism is at 1050 ± 10 ℃ in the stove, and stainless strip 4 evenly by furnace thread pipe 19, is tied with the stove silk 18 that be used to heat in furnace thread pipe 19 outsides by thermopair 20 tops, and it is that a kind of trade mark is the nichrome wire of OCr25Al5.Stove silk outside is interior furnace lining 17, and it is made by the higher aluminium sesquioxide material of purity.In order to prevent heat, so radiation screen 11 is housed in vacuum oven 16 both sides from the 16 both sides radiation of vacuum boiler tube.In addition, thermopair 21 is housed, is used to refer to the temperature at this place at vacuum boiler tube 16 outer walls.In order to install with easy to operate, whole body of heater 13 is placed on the stove stand 31, and set screw nut 32 is arranged on the stand 31, and lifting screwed pipe 36 and lifting nut 37 are used for regulating the body of heater height.Laterally move wheel 33 and link stopper 38, be used for regulating the body of heater level attitude.The outside is surrounded by 16 in the steel vacuum boiler tube of fixing thermal insulation layer on supporting spring 35, is connected with stove stand 31 by lifting screwed pipe 36.In the outside of body of heater 13 shell 12 is installed, suspension hook 34 is installed on the shell, be used for fixing and open and close thermal insulation layer 14.
In the both sides of body of heater 13, there is thermopair to draw chamber 9 and electrode is drawn chamber 23, be connected with steel vacuum boiler tube 16 by ring flange 24.8 are thermal cross among the figure, and 22 is electrode.Two chambers of drawing all are jacket structured, logical water coolant in the chuck.
The other end that electrode is drawn chamber 23 is a feeding vacuum chamber 27.Shown in Fig. 1 b, feeding vacuum chamber 27 is drawn chamber 23 with electrode and is connected by taking over 17, and taking over 17 be the clamp structure, leads to water coolants in the chuck 26.Locating wheel 5 is used for stainless steel tape 4 is positioned.As shown in Figure 4, feeding vacuum chamber 27 by retaining plate 58 and up and down slide plate 57 be installed on the leg 47.Be sleeved on the stationary shaft 56 at feeding vacuum chamber 27 involute tape holders 55.The top be bleed, feedhole 53, it 25 communicates with adapter.In order to observe feeding situation and loading and unloading stainless strip in operation, transparent case lid 49 is equipped with in front at the case tube 52 of feeding vacuum chamber 27, with tight capped nut 48 case lid 49 is kept vacuum-sealing by vaccum seal ring 51 and case tube 52, the operator can observe the feeding situation by the toughened glass on the case lid 49 50.The back of case tube 52 is water-cooled blocks 54.
As shown in Figure 1a, the thermopair the other end of drawing chamber 9 and cooling aspirating chamber 7 are connected by ring flange.As Fig. 1 a and shown in Figure 3, this chamber is one jacket structured, logical water coolants in the chuck 44.In order to observe tape cooling situation, vision slit 41 is housed.In order to measure the situation of vacuumizing, black vacuum table 42 is housed.For making the tape cooling quickly, in cooling aspirating chamber 7 inside cooled plate 43 is housed, this plate is made by the high copper material of thermal conductivity, in annealing process, burns red Stainless Steel Band 4 and is adjacent to and mistake above cooling plate, and tape is cooled off rapidly.Cooling aspirating chamber 7 belows are bleeding points 40, and it directly is connected with vacuum unit 10.A diffusion pump 39 is arranged in the vacuum unit, system is bled, to guarantee that system held is 10 with the pumping speed of 150 liters of per seconds
-4The vacuum tightness that mmHg is above.45 is high vacuum valve among Fig. 3, and 46 is base.
As shown in Figure 1a, the transition adapter 6 of the other end and the rewinding vacuum chamber 2 of cooling aspirating chamber 7 is connected by flange.It is jacket structured taking over 6, the inner logical water coolant of chuck.Locating wheel 5 is used for stainless strip 4 is positioned.As Fig. 1 a and shown in Figure 5, rewinding vacuum chamber 2 mainly is made up of case tube 52, case lid 49, water-cooled block 71, axle bed 67 and transmission rig electric control box 29.Being close to capped nut 48 between case lid 49 and the case tube 52 is connected, seals with sealing-ring 51.Toughened glass 50 is installed, so that observe the rewinding situation on the case lid 49.Bleeding on the case tube 52, feed port 53 are taken over 6 with transition and are communicated.Winding frame 77 is arranged in the case tube 52, and it is fixed on the drive shaft 65, and the fixedly stay hook 76 at stainless strip top is arranged on the winding frame 77.There is axle sleeve 72 top in the case tube 52, and it is enclosed within on the tape spool 75, and a tape spool 75 is fixed on the pedestal 73.Case tube 52 is supported on the leg 80 by upper and lower slide plate 78, retaining plate 79.The other end of case tube 52 is connected with water-cooled block 71, and the latter is connected with axle bed 67 again, is lined with sealing-ring 70 between water-cooled block 71 and axle bed 67.Among Fig. 5,66 is bearing; 68 is sealing-ring; 65 is drive shaft; 69 is lubricating cup; 64 is belt pulley; 63 is vee-belt; 62 is little speed reduction unit; 61 is variohm; 60 is wheel box; 59 is direct-current machine.By little speed reduction unit 62, variohm 61, wheel box 60 and direct-current machine mate mutually, can regulate the velocity of rotation of take-up frame 77 in the rewinding vacuum chamber 2, make the stainless strip uniform motion.
The operating process with this stainless strip vacuum continuous annealing furnace now is summarized as follows: a stainless strip of coiling 4 is put into feeding vacuum chamber 27, its strip ends links to each other with the afterbody that last dish has moved back fiery band, is fixed on the stay hook 76 in the rewinding vacuum chamber 2.Shut feeding vacuum chamber 27 and rewinding vacuum chamber 2, start vacuum unit 10, total system is vacuumized.Connect the power supply of stove silk 18, the stove silk is heated.Connect water coolant, treat that the system vacuum degree reaches 10
-4MmHg, temperature reaches 1050 ℃ in the furnace thread pipe 19, when vacuum boiler tube 16 outside wall temperatures are lower than 750 ℃, can start direct-current machine, the take-up frame 77 in the rewinding vacuum chamber 2 is rotated, this moment, stainless strip 4 beginnings were evenly by High Temperature Furnaces Heating Apparatus fiber tube 19, steel band heats herein, enter cooling aspirating chamber 7 then, steel band cools off herein, again on the take-up frame 77 of rolling in rewinding vacuum chamber 2.Stainless strip 4 continuous annealing under vacuum, after a dish annealing finished, the power failure machine cut out high vacuum valve, and stove fills atmosphere, opens vacuum rewinding chamber 2 then, takes out whole dribbling material, stays in the stove one section and does and draw bar.Put into a new dish stainless strip at feeding vacuum chamber 27 then, anneal by above-mentioned identical process.
Claims (4)
1, a kind of by the feeding vacuum chamber, body of heater, the vacuum continuous annealing furnace that cooling vacuum chamber and rewinding vacuum chamber are formed, the main body that it is characterized in that body of heater is the steel vacuum boiler tube of horizontal positioned, steel vacuum furnace tube outer wall has the thermal insulation layer of variable thickness, the centre of steel vacuum boiler tube is resistant to elevated temperatures furnace thread pipe, the furnace thread pipe outer wall is tied with nichrome wire, nichrome wire is wrapped up by fire-resistant tile, be placed with the vitrified pipe of ventilation heat-blocking action between this tile thermal insulation layer and vacuum boiler tube, a water-cooled copper plate is arranged in the cooling room, interior logical water coolant, take-up mechanism is arranged in the rewinding vacuum chamber, stainless strip is annealed by intravital furnace thread pipe of stove and cooling room continuously, twist in then in the take-up mechanism, in the whole annealing process, the vacuum tightness of annealing furnace is 10
-4Temperature is 1000-1050 ℃ in the mmHg, stove.
2, vacuum continuous annealing furnace as claimed in claim 1 is characterized in that said furnace thread pipe is an alumina tube, and the thermal insulation layer of parcel nichrome wire is an alumina material, and nichrome wire is the siderochrome aluminium nichrome wire of the OCr25Al5 through giving oxide treatment.
3, as claim 1,2 described vacuum continuous annealing furnaces is characterized in that said vacuum boiler tube is a stainless steel seamless pipe.
4, vacuum continuous annealing furnace as claimed in claim 1, the thermal insulation layer that it is characterized in that said variable thickness are fixedly thermal insulation layer of one deck, and fixedly thermal insulation layer has the Hough type can open and close thermal insulation layer outward, and the thermal insulation layer material is a pure aluminium silicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202609 CN85202609U (en) | 1985-07-01 | 1985-07-01 | Continuous vacuum annealing furnace for stainless steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202609 CN85202609U (en) | 1985-07-01 | 1985-07-01 | Continuous vacuum annealing furnace for stainless steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85202609U true CN85202609U (en) | 1986-05-28 |
Family
ID=4798379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85202609 Ceased CN85202609U (en) | 1985-07-01 | 1985-07-01 | Continuous vacuum annealing furnace for stainless steel strip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85202609U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035519C (en) * | 1992-11-25 | 1997-07-30 | 武汉钢铁公司 | Continuous annealer |
| CN101988149A (en) * | 2009-07-31 | 2011-03-23 | 上海格林赛高新材料有限公司 | Continuous electric heating and annealing furnace boiler device for uniformly softening T-shaped strip material |
| CN102382972A (en) * | 2011-10-21 | 2012-03-21 | 无锡博睿奥克电气有限公司 | Single-tubular gas protection fiber thermal treatment device |
| CN102534239A (en) * | 2012-01-19 | 2012-07-04 | 曲志程 | Lead melting device |
| CN107974546A (en) * | 2017-12-21 | 2018-05-01 | 杭州河合电器股份有限公司 | A kind of heat-generating pipe double-station differential annealing automation equipment |
| CN113355498A (en) * | 2021-06-15 | 2021-09-07 | 惠州市鑫洪柏精密五金制品有限公司 | Method for realizing bright annealing of stainless steel material |
-
1985
- 1985-07-01 CN CN 85202609 patent/CN85202609U/en not_active Ceased
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035519C (en) * | 1992-11-25 | 1997-07-30 | 武汉钢铁公司 | Continuous annealer |
| CN101988149A (en) * | 2009-07-31 | 2011-03-23 | 上海格林赛高新材料有限公司 | Continuous electric heating and annealing furnace boiler device for uniformly softening T-shaped strip material |
| CN102382972A (en) * | 2011-10-21 | 2012-03-21 | 无锡博睿奥克电气有限公司 | Single-tubular gas protection fiber thermal treatment device |
| CN102534239A (en) * | 2012-01-19 | 2012-07-04 | 曲志程 | Lead melting device |
| CN107974546A (en) * | 2017-12-21 | 2018-05-01 | 杭州河合电器股份有限公司 | A kind of heat-generating pipe double-station differential annealing automation equipment |
| CN107974546B (en) * | 2017-12-21 | 2023-05-05 | 杭州热威电热科技股份有限公司 | Automatic double-station local annealing equipment for heating tube |
| CN113355498A (en) * | 2021-06-15 | 2021-09-07 | 惠州市鑫洪柏精密五金制品有限公司 | Method for realizing bright annealing of stainless steel material |
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