CN103540736B - Heat treatment method and heat treatment method for steel rail profiling heel end section - Google Patents
Heat treatment method and heat treatment method for steel rail profiling heel end section Download PDFInfo
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- CN103540736B CN103540736B CN201310431374.4A CN201310431374A CN103540736B CN 103540736 B CN103540736 B CN 103540736B CN 201310431374 A CN201310431374 A CN 201310431374A CN 103540736 B CN103540736 B CN 103540736B
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Abstract
The invention relates to a heat treatment device for a steel rail profiling heel end section. The heat treatment device comprises a railhead front end wind box and a railhead rear end wind box, wherein the railhead front end wind box and the railhead rear end wind box are connected in a line, and the structures of the railhead front end wind box and the railhead rear end wind box are the same; a railhead left wind box end plate and a railhead right wind box end plate in the railhead front end wind box are welded with two ends of a notch-shaped railhead wind box cover plate; a notch of the notch-shaped railhead wind box cover plate sits on a railhead rear end wind box base plate; wind inlet openings are distributed at two sides of the notch-shaped railhead wind box cover plate and are communicated with the notch in the notch-shaped railhead wind box cover plate; a steel rail profiling heel end medium frequency induction heating forging and normalizing furnace is arranged at the front end of a press machine; a profiling heating induction ring is arranged in the furnace. The heat treatment device has the following advantages: firstly, the steel rail profiling heel end medium frequency induction heating furnace hearth thermal insulation material and heating coil are wound to be in profiling design, the steel rail heel end heating area can be effectively increased, and secondly, the added heel end wind spraying cooling device is fixed with a bracket by using upper and lower four wind cooling boxes all together, so that the device is simple and firm in structure.
Description
Technical field
The present invention relates to a kind of asymmetric section burning optimization on line rail heel end die mould section, after Frequency Induction Heating austenitizing, implement local, instantaneously rail head tunneling boring compressed air cooling, improving die mould section rail head surface hardness, case depth, final rail die mould heel end section thermal treatment unit with former material Performance Match and heat treating method to reaching, belonging to rail die mould heel end section thermal treatment unit manufacture field.
Background technology
CN201848499U, title " a kind of AT rail heel end induction furnace ", comprise body of heater, the burner hearth of the fire-resistant heat insulating material of tubulose is provided with in body of heater, it is characterized in that being axially arranged with outside burner hearth two the first and second electrical induction heating coils in parallel, body of heater is axially arranged with infrared thermometry element along burner hearth.Its weak point: induction heating burner hearth fire-resistant heat insulating material shape is round tubular design, two load coils in parallel are axially arranged with outside burner hearth, without tunneling boring compressed air cooling slack quenching device after heel end heating, die mould section rail head surface hardness, case depth, final and former material Performance Match cannot be guaranteed.
Along with the develop rapidly of rail track, China has possessed the design of high-speed railway circuit, has manufactured, and forms scale.And heavy haul railway circuit manufactures and designs, implementation process.Railway line rail for road is also along with raising, the increasing heavily of heavy haul train shipping axle of railway operation speed, and rail type, material, performance are continued to optimize and improved.For railway switch rail, steel mill's burning optimization on line rail in 2011 by such as: U75V-60AT (60D40) burning optimization on line rail, U78CrV (PG4)-60AT(60D40) (this rail hardening layer depth is greater than 30mm to burning optimization on line rail, hardness is greater than HB370, intensity is greater than 1200MPa, specifically see TB/T3109-2012), its strength property is high, hardened-depth, meets the technical qualification of heavy haul railway line rail for road.But the tongue (switch) that this rail is made finally wants the standard 60kg/m rail of upper track and circuit to be linked, after heel of switch rail is the Standard Gauge of 60kg/m by forging forming, connection could be realized.60AT (60D40) burning optimization on line rail heel end is after forging forming, and die mould section hardness, intensity significantly reduce, and about hardness is HB280 ~ 320.Point tongue heel end section intensity, the low meeting of hardness cause the service life reduction of switch, directly affect the track switch life-span.Therefore, after heel of switch rail forging and stamping, the thermal treatment of profiled section just becomes a critical difficult problem.
Summary of the invention
Purpose of design: avoid the weak point in background technology, design a kind of asymmetric section burning optimization on line rail heel end die mould section, after Frequency Induction Heating austenitizing, implement local, instantaneously rail head tunneling boring compressed air cooling, improving die mould section rail head surface hardness, case depth, final and former material Performance Match to reaching, meeting rail die mould heel end section thermal treatment unit and the heat treating method of turnout technology condition and circuit service requirements.
Design: in order to realize above-mentioned purpose of design.The present invention on the basis of background technology, 1, design and make and the similar and intermediate frequency induction heating device of suitable length of rail die mould heel end profile; Design rail profile profiling ruhmkorff coil, ensures die mould heel end section and ruhmkorff coil gap size, meets the requirement of the even and rate of heating of rail die mould heel end normalizing Heating temperature.2. design and make rail die mould heel end compressed air cooling device.3. before the metal compressed air cooling of the rail die mould heel end heated, die mould heel end tunneling boring is in austenitic state.For this reason, this device is point two portions in structure design, are first to design the Frequency Induction Heating ruhmkorff coil conformed to heel end shaping segment lenght, section form, for heel end profiled section different section position, design corresponding ruhmkorff coil, with ensure heating complete after whole profiled section homogeneous temperature.The design of ruhmkorff coil according to electrical induction heating principle, depth of current penetration computing method, set rational processing parameter etc. tunneling boring heated completely.Next be for tunneling boring heating austenitizing die mould section design a set of high pressure spray air-cooling device, corresponding compressed air cooling is implemented to reaching the speed of cooling matched with section to the different section of die mould heel end of the tissue being heated to uniform austenitic, ensure that cooling evenly, be fully formed sorbite tissue, reach the object of rail part slack quenching.Secondly, the thermal treatment unit of design heel of switch rail profiled section, carries out Frequency Induction Heating, compressed air cooling to forging forming section, realizes the slack quenching of die mould heel end, ensures that heel end intensity meets switch manufacture technical qualification.This apparatus design profiled section heating in medium frequency ruhmkorff coil, to heat, design compressed air cooling device carries out the cooling of heel end section, after this device is implemented, meets performance, hardness after the thermal treatment of tongue die mould heel end completely, reach and whole tongue Performance Match, improve point tongue work-ing life.
Technical scheme 1: a kind of rail die mould heel end section thermal treatment unit, comprise rail head front end bellows and rail head rear end bellows, rail head front end bellows are with the docking of rail head rear end bellows in-line and rail head front end bellows are identical with rail head rear end bellows structure, rail head left bellows end plate in its rail head front end bellows and the right bellows end plate of rail head weld with flute profile rail head bellows cover plate two ends, the notch seat of flute profile rail head bellows cover plate is at rail head rear end bellows base plate, air intake mouth is distributed in the both sides of flute profile rail head bellows cover plate and communicates with flute profile rail head bellows cover plate middle slot, the forging of rail die mould heel end Frequency Induction Heating is installed on pressing machine front end with normalizing furnace, contoured heat induction coil is provided with in stove.
Technical scheme 2: a kind of rail die mould heel end section heat treating method, according to rail die mould heel end physical dimension and length, make the intermediate frequency induction heating device similar with rail die mould heel end profile, and design rail profile profiling ruhmkorff coil, make between die mould heel end section and ruhmkorff coil in running fit, meet rail die mould heel end Heating temperature evenly and the requirement of rate of heating, then the die mould section for tunneling boring heating austenitizing designs a set of high pressure spray air-cooling device, corresponding compressed air cooling is implemented to the different section of die mould heel end of the tissue being heated to uniform austenitic, to reaching the speed of cooling matched with section, ensure that cooling evenly, be fully formed sorbite tissue, thus reach the object of rail part slack quenching.
The present invention is compared with background technology, one be rail heel end Medium Frequency Induction Heating Furnace thorax fire-resistant heat insulating material and heater coil coiling shape is contoured design, effectively can increase rail heel end heating surface area, heat-up time is short, be heated more even, meet rail die mould heel end Heating temperature evenly and the requirement of rate of heating; Two be set up heel end compressed air cooling device adopt up and down totally four joint air-cooled boxes and support fix, this apparatus structure is simple and firm, it is convenient to safeguard, empty by reasonable layout wind box cooling spray, ensure that rail heel end obtains enough cooling rates, good cooling performance can be reached after making rail die mould, thus obtain the hardness and structure of conformance with standard requirement.
Accompanying drawing explanation
The structural representation of the heating of Fig. 1-1 rail die mould heel end section and rail head cooling heat treatment unit.
Fig. 1-2 is the plan structure schematic diagram of Fig. 1-1.
Fig. 2-1 is the main TV structure schematic diagram of compressed air cooling device.
Fig. 2-2 be in Fig. 2-1 A to structural representation.
Fig. 3-1 is the structural representation of rail head front end bellows.
Fig. 3-2 is the sectional structure schematic diagram in A-A portion in Fig. 3-1.
Fig. 3-3 is sectional structure schematic diagram that in Fig. 3-1, N-N cuts open.
Fig. 4 is the structure for amplifying schematic diagram of rear end bellows base plate pore.
Fig. 5 is induction heater and compressed air cooling device installation site schematic diagram.
Fig. 6 is the heat induced coil schematic diagram in process furnace.
Fig. 7 is the plan structure schematic diagram of AT rail air-jet device.
Fig. 8 is the schematic diagram of compressed air cooling device after the normalizing of rail die mould heel end.
Embodiment
Embodiment 1: with reference to accompanying drawing 5.As shown in Figure 5, in figure, position shown in sequence number 13,14 and 15 represents compressed air cooling device after rail die mould heel end intermediate frequency induction heating device, rail die mould heel end Medium frequency induction normalizing heating unit and the normalizing of rail die mould heel end respectively for rail die mould Frequency Induction Heating, the on-the-spot plan view from above of normalizing and air-jet device.Wherein rail die mould heel end Frequency Induction Heating and normalizing heating unit 13 and 14 are positioned at 5000t pressing machine rear end.The ruhmkorff coil that rail die mould heel end Medium frequency induction rectangle body of heater heating unit 13 and 14 is embedded in installation is profiling ruhmkorff coil (as shown in Figure 6), this profiling ruhmkorff coil heat time and rail die mould heel end section be running fit 25 ~ 30mm, heat-up time is about 6min, Heating temperature of coming out of the stove is about 1150 DEG C, Figure 7 shows that rectangular-shaped inductor answers process furnace inner structure schematic diagram.After the rail die mould heel end normalizing of 14 representatives, the detailed material object of compressed air cooling device as shown in Figure 8.
With reference to accompanying drawing 1-8.A kind of rail die mould heel end section thermal treatment unit, comprise rail head front end bellows 101 and rail head rear end bellows 102, rail head front end bellows 101 are with the docking of rail head rear end bellows 102 in-line and rail head front end bellows 101 are identical with rail head rear end bellows 102 structure, rail head left bellows end plate 1 in its rail head front end bellows 101 and the right bellows end plate 4 of rail head weld with flute profile rail head bellows cover plate 2 two ends, the notch seat of flute profile rail head bellows cover plate 2 is at rail head rear end bellows base plate 3, air intake mouth 5 is by Rubber washer 6, bolt 7, packing ring 8 distributes (sealing fixing) in the both sides of flute profile rail head bellows cover plate 2 and communicate with flute profile rail head bellows cover plate 2 middle slot, air intake mouth 5 is communicated with high-pressure air hose 10, high-pressure air hose 10 wall has spray air holes 11, this spray air holes 11 is directly to processed rail die mould heel end section, flange of rail bellows are identical with above-mentioned rail head bellows structure, and width size is slightly large compared with the former.Rail head rear end bellows base plate 3 is furnished with multiple pore 9, and the import and export of pore 9 are all in Double-horn type structure.With reference to accompanying drawing 8.Rail head front end bellows 101 are communicated with air outlet arranged side by side multiple in wind-pressure tube 104 by sebific duct 103 with the air intake mouth 5 in rail head rear end bellows 102, wind-pressure tube 104 blast inlet air reservoir 105 is communicated with, and rail head front end bellows 101 are communicated with outlet air end 107 with magnetic valve 106 by sebific duct 103 with the air outlet 5 in rail head rear end bellows 102.
Embodiment 2: on the basis of embodiment 1, a kind of rail die mould heel end section heat treating method, according to rail die mould heel end physical dimension and length, make the intermediate frequency induction heating device 13 similar with rail die mould heel end profile, and design rail profile profiling ruhmkorff coil, make between die mould heel end section and ruhmkorff coil in running fit, meet rail die mould heel end Heating temperature evenly and the requirement of rate of heating, then the rail heel end die mould section for tunneling boring heating austenitizing designs a set of high pressure spray air-cooling device 15, corresponding compressed air cooling is implemented to the different section of die mould heel end of the tissue being heated to uniform austenitic, to reaching the speed of cooling (3.5 ~ 4min) matched with section, ensure that cooling evenly, be fully formed sorbite tissue, thus reach the object of rail part slack quenching.
It is to be understood that: although above-described embodiment to be contrasted detailed text description to mentality of designing of the present invention; but these text descriptions; just the simple text of mentality of designing of the present invention is described; instead of the restriction to mentality of designing of the present invention; any do not exceed mentality of designing of the present invention combination, increase or amendment, all fall within the scope of protection of the present invention.
Claims (5)
1. a rail die mould heel end section thermal treatment unit, comprise flange of rail bellows and rail head bellows, wherein rail head bellows comprise rail head front end bellows (101) and rail head rear end bellows (102), it is characterized in that: rail head front end bellows (101) becomes in-line to dock with rail head rear end bellows (102) and rail head front end bellows (101) is identical with rail head rear end bellows (102) structure, rail head left bellows end plate (1) in its rail head front end bellows (101) and the right bellows end plate (4) of rail head are welded with flute profile rail head bellows cover plate (2) two ends, the notch side balanced welding of flute profile rail head bellows cover plate (2) is on rail head rear end bellows base plate (3), high pressure air intake mouth (5) is distributed in the both sides of flute profile rail head bellows cover plate (2) and communicates with flute profile rail head bellows cover plate (2) middle slot, flange of rail bellows are identical with above-mentioned rail head bellows structure, and width size is slightly large compared with the former, after rail die mould heel end intermediate frequency induction heating device (13) and the normalizing of rail die mould heel end, compressed air cooling device is positioned at 5000t pressing machine rear end, is provided with contoured heat induction coil in stove.
2. according to the rail die mould heel end section thermal treatment unit described in claim 1, it is characterized in that: profile and the length of this intermediate frequency induction heating device cavity shape and length and processed rail die mould heel end match, be positioned at the ruhmkorff coil shape of intermediate frequency induction heating device inner chamber by rail profile profiling, its ruhmkorff coil and die mould heel end section are running fit, meet rail die mould heel end normalizing Heating temperature evenly and the requirement of rate of heating; Rail die mould heel end compressed air cooling device is connected in series with intermediate frequency induction heating device, and before the metal compressed air cooling of the rail die mould heel end of heating, die mould heel end tunneling boring is in austenitic state.
3. according to the rail die mould heel end section thermal treatment unit described in claim 1, it is characterized in that: the ruhmkorff coil in rail die mould heel end intermediate frequency induction heating device is profiling ruhmkorff coil, gap between this profiling ruhmkorff coil and rail die mould heel end section is 25 ~ 30mm, heat-up time is 5-7min, and Heating temperature of coming out of the stove is 1140 DEG C-1160 DEG C.
4., according to the rail die mould heel end section thermal treatment unit described in claim 1, it is characterized in that: rail head rear end bellows base plate (3) is furnished with multiple pore (9).
5. rail die mould heel end section thermal treatment unit according to claim 4, is characterized in that: the import and export of pore (9) are all in Double-horn type structure.
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| CN103540736B true CN103540736B (en) | 2015-05-06 |
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Cited By (1)
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| RU2755713C1 (en) * | 2020-06-05 | 2021-09-20 | Общество с ограниченной ответственностью "Информационные технологии" (ООО "ИнфоТех") | Apparatus and method for heat treatment of a long-length product with an l-shaped profile with a sole, neck, head |
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| CN105483348A (en) * | 2015-12-29 | 2016-04-13 | 中铁宝桥集团有限公司 | AT steel rail profiling heel thermal treatment production line and treatment method |
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| CN107142367B (en) * | 2017-06-22 | 2018-10-12 | 中国铁道科学研究院金属及化学研究所 | A kind of heel end forging and stamping section heat treatment mechanism of burning optimization on line AT rail |
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| CN202730186U (en) * | 2012-08-09 | 2013-02-13 | 株洲敏锐机车配件有限责任公司 | Quenching device |
| CN202730187U (en) * | 2012-08-09 | 2013-02-13 | 株洲敏锐机车配件有限责任公司 | Air blasting and cooling device |
| CN202881785U (en) * | 2012-09-28 | 2013-04-17 | 中铁宝桥集团有限公司 | Steel rail flash soldered connection head wind spray cooling device |
| CN203700436U (en) * | 2013-09-22 | 2014-07-09 | 中铁宝桥集团有限公司 | Device for carrying out heat treatment on steel rail briquetting root-end section |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2755713C1 (en) * | 2020-06-05 | 2021-09-20 | Общество с ограниченной ответственностью "Информационные технологии" (ООО "ИнфоТех") | Apparatus and method for heat treatment of a long-length product with an l-shaped profile with a sole, neck, head |
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