CN1011801B - Heat treatment equipment and quenching technology for rails - Google Patents
Heat treatment equipment and quenching technology for railsInfo
- Publication number
- CN1011801B CN1011801B CN 89100982 CN89100982A CN1011801B CN 1011801 B CN1011801 B CN 1011801B CN 89100982 CN89100982 CN 89100982 CN 89100982 A CN89100982 A CN 89100982A CN 1011801 B CN1011801 B CN 1011801B
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- CN
- China
- Prior art keywords
- rail
- heater
- heat treatment
- cooling
- quenching
- Prior art date
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Abstract
The present invention relates to heat treatment equipment and a quenching technology for steel rails. A heat treatment machine for steel rails formed by combining a heater and a cooling device is used for carrying out the heat treatment of a steel rail with an underspeed quenching method in a way that the heat treatment machine forms a cut angle of 20 degrees to 85 degrees with a rail top longitudinal axis of the steel rail, and the width of a welded joint soft strip of the full length quenched steel rail can be effectively shortened. At the same time, the soft strip exists in an oblique mode, and therefore, the superposition impact of wheels can be avoided. The equipment is simple and is convenient for field operation. Through tests, all the indexes of the steel rail treated through heat treatment fulfill requirements.
Description
The present invention relates to equipment and quenching technical that railway track is heat-treated, is on-the-spot railway track Equipment for Heating Processing, is applicable to the full quenching rail welding after-baking, also is applicable to the termination heat treatment of common rail.
Near the soldered of welding full quenching rail, joint welding after annealing can occur, mechanical performances such as the metallographic structure of this part rail and hardness the soft band of joint occurs far below former head hardened rail.In long-term operation, cause disease phenomenons such as lowly collapsing appears in rail, saddle type.Therefore be necessary to use rail heat treatment machine, in the commissure postwelding joint heat-treated in the open air, dwindle the soft bandwidth of heat affected zone to greatest extent, change the form that soft band exists simultaneously.
Japanese patent application JP61-149436, introduced with the rail's end portion injection caburation cooling medium of nozzle to high temperature, rail's end portion is slowly cooled off, and the method with moving nozzle and rail's end portion distance is controlled cooling velocity in injection, United States Patent (USP) 4,668,308 introduced a kind of to rail heat-treating process and parameter.The both does not improve angle of cut formula～oblique mode of heating.
The objective of the invention is to propose a kind of on-the-spot i and quenching technical that uses that be applicable to, it can dwindle the soft bandwidth in heat-affected zone to greatest extent, changes the form that soft band exists simultaneously, and heat-treating machine is simple in structure, is convenient to The field.Use apparatus of the present invention and method through heat treated rail, various mechanical performance index all can meet the demands.
The present invention is achieved in that i and quenching technical, rail longitudinal axis is formed 20 °～85 ° angle of cut formula mode of heating with the parallel heater flame cover of the many rows of hat, adopt the slack quenching method that rail is heat-treated, soon the joint heating surpasses austenitic temperature AC behind the full quenching rail welding
3After immediately with water spray cooling, cooling velocity subcritical quenching velocity; I is made up of heater and cooling unit, heater can separate with cooling unit and works alone, be connected to each other with pipeline again, heater is a hollow structure, inside is provided with the ventilating pipe cooling water pipe, flame cover is established in the heater end, establish a plurality of fire jetting holes on the cover, cooling unit comprises spray cap and water supply installation, a plurality of water spouts are established in the cover inboard, make water in the atomizing of spray cap high pressure nozzle place, and the fire jetting hole of heater flame cover is the many rows of hat and is arranged in parallel, adopt the ventilation gas-distributing pipe of symmetric arrangement, roller is established in the flame cover of heating tube and the spray cap of cooling unit bottom, and complete machine can be swung at the rail upper edge tread longitudinal axis.
Equipment and method that the present invention shows have following characteristics:
1, the rail depth of hardening zone is suitable, shape is reasonable, and hardness is suitable, and metallographic structure is sorbite ten troostites, fine and close, drop hammer, quiet curved, tired, impact toughness and toughness data, tensile strength, yield strength, elongation per unit length, the contraction percentage of area etc. all can reach instructions for use.
2, device therefor and use technology, light, simple, suitable on-the-spot the use.
3, the rail heat treatment machine design is unique, be 20 °～85 ° oblique angles with rail longitudinal axis, not only eliminated the soft zone in the 100mm left and right sides of original prior heat treatment method preferably, and the length that produces two new soft zones in influence area after the heat treatment is controlled in 5～10mm.The change of soft zone existence form makes the wheel in the rolling can not be pressed in oblique soft being with simultaneously, reduces or avoided the stack impact force of wheel.
4, reduce rail wear, significantly reduce the rail collapse disease.
Fig. 1: rail heat treatment machine fundamental diagram
Fig. 2: heater flame cover schematic diagram
Now further narrate by reference to the accompanying drawings the present invention:
Referring to Fig. 1: heater 1 is by gas flow control cabinet 2 control air inlet quantity, at gas flow control cabinet 2 interior installation spinner flowmeters 5, flow with oxygen 4 and acetylene gas 3 under its adjustment duty, in the front of every spinner flowmeter 5 needle valve and valve 17 have been installed all, in gas flow control cabinet 2 fronts air feed monitoring pressure table has been installed, acetylene gas 3 and oxygen 4 that gas flow control cabinet 2 is supplied with enter flame cover 21 by breather pipe 18, roller 15 is located at heater 1 bottom, supporting heater, and makes reciprocally swinging at the rail rail level. Cooling device utilizes generator power supply 9 to switch on the pump 13, is drawn water by water tank 6 and send by cooling Water lines 7 enters heater 1, gets back to water tank 6 by return pipe 8 again, and heater 1 is realized circulating cooling. Utilize generator power supply 9, the water of cooling water tank 14 by pipeline 19, can also be pumped into discharge control cabinet 12, in discharge control cabinet 12, establish spinner flowmeter 11, by the flow of its control water supply. In order to adapt to the requirement of technology, it is parallel that heater is made many row's hats, and used burning gases are supplied with by same mixing chamber, and fire jetting hole 22 is certain arranged with interval.
Rail is carbon steel, and rail is heated to austenitic temperature AC3More than, with the mode of spraying cooling, realize incomplete quenching, obtain the sorbite tissue. The heater that adopts acetylene gas to act as a fuel, oxygen and acetylene gas match ratio such as table 1, flame are little carburizing flame.
Table 1: the match ratio of oxygen and acetylene gas
Gaseous species air feed meter pressure Pa meter readings m3/h
Oxygen 49 * 104Pa 4.3
Acetylene gas 14.7 * 10Pa 4.4
The direct detonation igniting at the steel rail welding line place, heater is the high-power oxy-acetylene heaters of many rows, a heated length is 150mm.Heater hunting frequency 40～60 times/minute, reciprocally swinging by hand, oscillating quantity is 50mm.
Hardening heat is looked rail type and is different, for U
74The austenitic temperature AC of rail
3Be 780 ℃, the rail heating-up temperature is AC
3+ 30～50 ℃ more taller, about 5 minutes heat time heating times.
When spray water is cooled off, because the liquid pearl striking work surface of hardening media, steam very easily is excluded, improved characteristic temperature, increased the foam boiling stage, also be not able to do in time overheatedly because of the liquid pearl on striking work surface again, moment is just replaced by new liquid pearl, institute is so that spray water cooling velocity and uniformity significantly improve, and rotor flow-control meter 11 control injection flow rates are 11m
3About/h.
Adopt gas pressure welding welding back that heat treated quality is used new equipment to the total length head hardened rail and heat-treat engineer testing, find out technological parameter, obtain the quenched sorbite tissue.Employing Ministry of Railways standard is dropped hammer, quiet curved, tired, mechanical test, and hardness mensuration, and parameters such as low power metal lographic examination all obtain comparatively ideal effect.The quench hardened case shape is reasonable, and the degree of depth is an amount of.
Referring to Fig. 2 a, b: heater is provided with a plurality of flame covers 21 as required, it and rail tread longitudinal axis form the α angle, generally in 20 °～85 ° scopes, change, arrange that at the parallel steel rails y direction cooling flow pipe 7, return pipe 8, ventilating pipe 18, oxygen and acetylene gas are by the gas-distributing pipe 24 of ventilating pipe 18 by each flame cover 21, enter flame conduit 25, make fire jetting hole 22 flames.Meanwhile, cooling water makes each flame cover 21 cooling by cooling off the distributive pipe 23 that flow pipe 7 enters each flame cover 21,
By return pipe 8, get back to water tank 6 again.
In order to make rail 16 obtain owing the speed cooling, after heater is finished heating to steel wheel, start generator power supply 9, by submersible pump 20, the water process pipeline 19 with water tank 14 pumps into discharge control cabinet 12, enter spray cap 10 through spinner flowmeter 11 control flows, water is atomized at the nozzle place.
Now sketch embodiments of the invention:
Heater adopts oxygen and acetylene gas mixed combustion, and fire jetting hole diameter 1mm adopts 51 fire jetting holes, injection flow rate 1m altogether
3/ hour, spray time 15 seconds.Quenching temperature is selected 850～920 ℃, and heated length once is 150mm, and oscillating quantity is 50mm.5 minutes heat time heating times.Heater is arranged three rows, fire jetting hole spacing 7～8mm, with rail apart from 25mm, be 30 ° of oblique angles, fire jetting hole gross area 41.52mm, maximum spout fire hole diameter: φ 1.1mm.30 high-pressure fog mouths are housed in the spray cap of cooling unit, are used for the cooling of spraying of rail heating position.Injection flow rate is by 11 controls of the spinner flowmeter in the discharge control cabinet.Amount of gas is controlled by the spinner flowmeter in the gas control cabinet.
Claims (2)
1, the quenching technical of rail, it is characterized in that: rail longitudinal axis is formed 20 °～85 angle of cut formula mode of heating with the parallel heater flame cover of the many rows of hat, adopt the slack quenching method that rail is heat-treated, soon the joint heating surpasses austenitic temperature AC behind the full quenching rail welding
3After immediately with water spray cooling, cooling velocity subcritical quenching velocity.
2, i, it is characterized in that: i is made up of heater 1 and cooling unit, heater 1 can separate with cooling unit and works alone, be connected to each other with pipeline again, heater 1 is a hollow structure, inside is provided with ventilating pipe 18, cooling flow pipe 7, flame cover 21 is established in heater 1 end, establish a plurality of fire jetting holes 22 on the cover, cooling unit comprises spray cap 10 and water supply installation, a plurality of water spouts are established in the cover inboard, make water in the atomizing of spray cap high pressure nozzle place, and heater flame cover 21 forms 20 °～85 ° oblique angle with the rail tread longitudinal axis; The fire jetting hole 22 of heater flame cover is the many rows of hat and is arranged in parallel, and adopts the ventilation gas-distributing pipe 24 of symmetric arrangement, and roller 15 is established in the flame cover of heater 1 and the spray cap of cooling unit bottom, and complete machine can be swung at the rail upper edge tread longitudinal axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89100982 CN1011801B (en) | 1989-03-06 | 1989-03-06 | Heat treatment equipment and quenching technology for rails |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89100982 CN1011801B (en) | 1989-03-06 | 1989-03-06 | Heat treatment equipment and quenching technology for rails |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1036042A CN1036042A (en) | 1989-10-04 |
| CN1011801B true CN1011801B (en) | 1991-02-27 |
Family
ID=4854089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89100982 Expired CN1011801B (en) | 1989-03-06 | 1989-03-06 | Heat treatment equipment and quenching technology for rails |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1011801B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107130098B (en) * | 2017-06-14 | 2019-07-12 | 武汉钢铁有限公司 | Heat-treatment of rail device and heat treatment method |
-
1989
- 1989-03-06 CN CN 89100982 patent/CN1011801B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1036042A (en) | 1989-10-04 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |