CN101435010A - Carring bar intermediate frequency induction hardening heat treatment process and intermediate frequency quenching machine tool - Google Patents
Carring bar intermediate frequency induction hardening heat treatment process and intermediate frequency quenching machine tool Download PDFInfo
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- CN101435010A CN101435010A CNA2007101899931A CN200710189993A CN101435010A CN 101435010 A CN101435010 A CN 101435010A CN A2007101899931 A CNA2007101899931 A CN A2007101899931A CN 200710189993 A CN200710189993 A CN 200710189993A CN 101435010 A CN101435010 A CN 101435010A
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Abstract
The invention discloses a heating processing technology of intermediate frequency induction hardening of a top beam and a device thereof, which comprises quenching and tempering; wherein, the quenching uses intermediate frequency induction hardening and am original intermediate frequency quenching machine tool; the quenching parameters are as follows: the quenching temperature is within 930-970 DEG C; the running speed of the top beam is within 0.62-0.72m/min on the intermediate frequency quenching machine tool; the top beam running is heated by a heater; after heating, water spay cooling is carried out by a spray quenching device; water spray pressure is within 0.9-1.1Mpa; and the tempering temperature is determined according to the content percentage of chemical elements C, Si, Mn in the top beam by the formula researched by the inventor. The heating processing technology of the top beam has the advantages of rapid heating rate, high productivity effect, high thermal efficiency, as well as steady quality, excellent mechanical property and small deformation of the top beam, etc.
Description
Technical field
The present invention relates to a kind of quenching heat treatment Processes and apparatus, relate in particular to a kind of back timber such as DFB type back timber quenching heat treatment technology and medium frequency quenching lathe and quenching machine.
Background technology
DFB type back timber is a colliery supporting product.Because the geologic condition under the mine is special, back timber stressed complexity in the use under mine.In the use, back timber does not allow brittle failure, and gross distortion can not take place, and therefore requires back timber to have the good mechanical performance, promptly guaranteeing have under the higher-strength prerequisite, good plasticity and toughness be arranged.
At present, back timber is heat-treated modified employing quenching and tempered method, generally adopts desk-top or chamber type electric resistance furnace, whole heating, integral quenching refrigerative method; Because this heating means are to utilize thermal radiation and thermal convection that workpiece temperature is raise, thermo-efficiency is low, and heat-up time is long, cause the workpiece surface decarburization serious, quench cooled is inhomogeneous simultaneously, causes the workpiece quenching hardness inhomogeneous, influence the back timber mechanical property, work-ing life is shorter; Because heat-up time is long, and quench cooled is inhomogeneous, the back timber distortion is serious in addition; Traditional quenching method labor strength is big, and production efficiency is low.
Induction heating is the comparatively ideal a kind of type of heating of hard surfacing, and induction heating is direct-fired by workpiece induced inside electric current, also claims endogenous heating, has the thermo-efficiency height, the characteristics that rate of heating is fast.Workpiece is placed in the well heater, and well heater connects the sensing apparatus output terminal, when the alternating-current of certain frequency during by well heater because electromagnetic induction and proximity effect, promptly in workpiece, produce with well heater in the induced current of current opposite in direction, promptly form eddy current.Under the effect of eddy current and the resistance of workpiece own, electric energy promptly is converted into heat energy, thereby makes workpiece obtain heating.According to the hot depth of current penetration of structure iron
(f is the induced current frequency in the formula, and unit is: Hz), according to this formula as can be known: the workpiece induction heating degree of depth and induced current frequency have relation (invention of this technology: the intermediate frequency device frequency of employing is 2500Hz, and power is 250kW).Induction quenching is mainly used in the quenching of metal works surface local at present, as diamond saw blade, drill bit, lathe tool, machine tool guideway, gear, automobile gimbal, bent axle, fastening piece etc.Because the mechanical property of special construction, material characteristics and the requirement of back timber, existing induction quenching method is not suitable for the thermal treatment of back timber.
Summary of the invention
It is long to the objective of the invention is to overcome the heat-up time that traditional back timber quenching technology exists, and causes the workpiece surface decarburization serious, and the workpiece quenching hardness just differs, the mechanical property instability, and work-ing life is shorter; Production efficiency is low, and thermo-efficiency is low; Whole Cooling Quenching causes shortcomings such as workpiece deformation is serious, and labor strength is big, provides a kind of rate of heating fast, production efficiency height, thermo-efficiency height; Workpiece quality is stable, good mechanical performance, and workpiece deformation is little, reduces the back timber mid-frequency induction hardening thermal treatment process of labor strength.
Another object of the present invention provides the medium frequency quenching lathe of a kind of above-mentioned back timber mid-frequency induction hardening thermal treatment process special use.
The objective of the invention is to be achieved through the following technical solutions:
A kind of back timber mid-frequency induction hardening thermal treatment process, comprise and quenching and tempering, adopt mid-frequency induction hardening when wherein quenching, parameters of quenching is as follows: quenching temperature is 930～970 ℃, and preferred quenching temperature is 930～939 ℃ or 941～959 ℃ or 961～970 ℃; Back timber travelling speed on the medium frequency quenching lathe is 0.62～0.72m/min; Heating back is by the spraying quenching device cooling of spraying water.
Water spray pressure was 0.9～1.1Mpa when water spray cooled off among the present invention, and water temperature is 10～40 ℃; Tempering temperature is calculated according to following formula and is determined that tempering insulation time is 100～120min,
T (℃)=480 ℃+(C
When-0.5) * 500 ℃
In the formula,
C, Si, Mn are respectively the percentage ratio of carbon in the material, silicon, manganese element content.
A kind of medium frequency quenching lathe that is applicable to back timber mid-frequency induction hardening thermal treatment process of the present invention, this medium frequency quenching lathe comprise lathe bed, are located at well heater and spraying quenching device on the lathe bed; End at lathe bed also is provided with drive unit, and drive unit is connected with power set by conveyer chain; The other end at lathe bed also is provided with hold-down gear; Lathe bed is provided with the carrying roller of guaranteeing the back timber smooth running and the edger roll that guarantees the back timber traffic direction; The angle of the spout hole axis of spraying quenching device and back timber traffic direction on lathe is 60～80 degree.
Well heater in the technology of the present invention on the used medium frequency quenching lathe adopts the patented technology (patent No. ZL 02 2 86984.0) of inventor's application, and spraying quenching device adopts the patented technology (patent No.: ZL02 2 86825.9) of inventor's application.
Because back timber mid-frequency induction hardening thermal treatment process of the present invention has adopted above-mentioned technical scheme, so the present invention has the following advantages (comparing with prior heat treatment process): (1) rate of heating is fast, and production efficiency can improve 40%～60%; (2) during induction heating, rely on back timber induced inside electric current direct heating, thermosteresis is few, and thermo-efficiency can improve 30%～40%; (3) back timber steady quality, good mechanical performance, back timber can improve 30～60% work-ing life; (4) back timber thermal treatment after strain is little, must not correct (the heat treated back timber distortion of traditional technology is big, and every back timber must be corrected); (5) back timber quenches and easily realizes automatization, mechanize reducing labor strength.
Description of drawings
Accompanying drawing is a medium frequency quenching machine tool structure synoptic diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment 1
The medium frequency quenching lathe comprises lathe bed 5, is located at well heater 2 and spraying quenching device 3 on the lathe bed 5; End at lathe bed also is provided with drive unit 1, and drive unit 1 is connected with power set 8 by conveyer chain, also is provided with hold-down gear 4 at the other end of lathe bed; Lathe bed is provided with the carrying roller 7 of guaranteeing the back timber smooth running and guarantees back timber 9 traffic direction edger rolls 6; The angle of the spout hole axis of spraying quenching device 3 and back timber 9 traffic direction on lathe is 60～80 degree.
Quenching machine principle of work: during quenching, back timber 9 is placed in the well heater 2, well heater 2 connects intermediate frequency equipment 10 output terminals by copper belt 11, when the alternating-current of certain frequency passes through well heater 2, because electromagnetic induction and proximity effect, promptly in back timber 9, produce with well heater 2 in the induced current of current opposite in direction, promptly form eddy current.Under the effect of eddy current and the resistance of back timber own, according to Joule-Lenz's law, Q=0.24I
2Rt, electric energy promptly are converted into heat energy, thereby make back timber 9 obtain heating.Drive back timber 9 by drive unit 1 and move on quenching machine, hold-down gear 4 and edger roll 6, carrying roller 7 guarantee that back timber 9 operates steadily and traffic direction, and back timber 9 passes through from well heater 2, to realize the purpose of heating; The back timber 9 of heating passes through from spraying quenching device 3, to realize the purpose of quench cooled.
The ginseng of quenching parameter is as follows: quenching temperature is 930 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.72m/min; Heating back is by the spraying quenching device cooling of spraying water, and the spraying quenching device pressure of spraying water is 0.9Mpa, and water temperature is 10 ℃.
Back timber adopts whole tempering process behind mid-frequency induction hardening, the tempering heating installation is common desk-top resistance furnace, and calculate according to following formula and determine tempering temperature,
T (℃)=480 ℃+(C
When-0.5) * 500 ℃,
In the formula,
C, Si, Mn are respectively the percentage ratio of carbon in the material, silicon, manganese element content.This batch of back timber materials chemistry Elements C, Si, Mn component content are respectively: C:0.24%, and Si:1.13%, Mn:1.12%, calculate definite according to formula: tempering temperature is: 460 ℃.Tempering insulation time is 100min.
The inventor determines this tempering temperature formula according to experimental study, and this formula only is applicable to that material is the tempering after the 27SiMn back timber medium frequency induction hardening; Chemical element component content deviation conformance with standard requirement in the back timber material simultaneously; The tempering temperature that calculates according to this formula takes rounding-off method to be accurate to ten in addition.
When induction heating, because rate of heating is fast, phase transformation is carried out under very big superheating temperature, and its nucleation rate and grain growth speed all increase; But along with superheating temperature increases, the increase of nucleation rate is greater than the increase of grain growth speed, so under same Heating temperature, rate of heating is faster, resulting austenite actual die is just more little, and after the quenching, martensite is also more tiny, and hardness is also higher.Therefore, behind the induction quenching, hardness ratio common heating quenching hardness height, after the quenching, tempering temperature is also answered corresponding raising; Simultaneously because chemical element C, Si in the different batches back timber starting material (27SiMn), Mn content are different, the every batch of back timber tempering temperature is difference to some extent, for this reason, works out the formula of determining tempering temperature.
Embodiment 2
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 932 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.71m/min; Spraying quenching device water spray pressure is 0.92Mpa during quenching, and water temperature is 12 ℃.
This batch of back timber materials chemistry Elements C, Si, Mn component content are respectively: C:0.31%, and Si:1.32%, Mn:1.35%, calculate definite according to the tempering temperature formula: tempering temperature is 520 ℃.
Tempering insulation time is 102min.
Embodiment 3
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 935 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.70m/min; Spraying quenching device water spray pressure is 0.94Mpa during quenching, and water temperature is 14 ℃.
This batch of back timber material chemical composition content is: C:0.26%, and Si:1.31%, Mn:1.25%, calculate definite according to the tempering temperature formula: tempering temperature is: 490 ℃.
Tempering insulation time is 104min.
Embodiment 4
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 937 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.69m/min; Spraying quenching device water spray pressure is 0.96Mpa during quenching, and water temperature is 16 ℃.
This batch of back timber material chemical composition content is: C:0.27%, and Si:1.20%, Mn:1.18%, calculate definite according to the tempering temperature formula: tempering temperature is 480 ℃.
Tempering insulation time is 106min.
Embodiment 5
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 939 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.68m/min; Spraying quenching device water spray pressure is 0.98Mpa during quenching, and water temperature is 18 ℃.
This batch of back timber material chemical composition content is: C:0.30%, and Si:1.14%, Mn:1.32%, calculate definite according to the tempering temperature formula: tempering temperature is 500 ℃.
Tempering insulation time is 108min.
Embodiment 6
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 941 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.67m/min; Spraying quenching device water spray pressure is 1.00Mpa during quenching, and water temperature is 20 ℃.
This batch of back timber material chemical composition content is: C:0.25%, and Si:1.15%, Mn:1.12%, calculate definite according to the tempering temperature formula: tempering temperature is 470 ℃.
Tempering insulation time is 110min.
Embodiment 7
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 947 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.66m/min; Spraying quenching device water spray pressure is 1.02Mpa during quenching, and water temperature is 22 ℃.
This batch of back timber material chemical composition content is: C:0.32%, and Si:1.33%, Mn:1.35%, calculate definite according to the tempering temperature formula: tempering temperature is 520 ℃.
Tempering insulation time is 112min.
Embodiment 8
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 955 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.65m/min; Spraying quenching device water spray pressure is 1.04Mpa during quenching, and water temperature is 24 ℃.
This batch of back timber material chemical composition content is: C:0.27%, and Si:1.31%, Mn:1.23%, calculate definite according to the tempering temperature formula: tempering temperature is 490 ℃.
Tempering insulation time is 114min.
Embodiment 9
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 959 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.64m/min; Spraying quenching device water spray pressure is 1.06Mpa during quenching, and water temperature is 26 ℃.
This batch of back timber material chemical composition content is: C:0.30%, and Si:1.19%, Mn:1.36%, calculate definite according to the tempering temperature formula: tempering temperature is 510 ℃.
Tempering insulation time is 116min.
Embodiment 10
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 961 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.63m/min; Spraying quenching device water spray pressure is 1.08Mpa during quenching, and water temperature is 29 ℃.
This batch of back timber material chemical composition content is: C:0.25%, and Si:1.21%, Mn:1.31%, calculate definite according to the tempering temperature formula: tempering temperature is 480 ℃.
Tempering insulation time is 118min.
Embodiment 11
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 965 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.63m/min; Spraying quenching device water spray pressure is 1.10Mpa during quenching, and water temperature is 35 ℃.
This batch of back timber material chemical composition content is: C:0.32%, and Si:1.40%, Mn:1.39%, calculate definite according to the tempering temperature formula: tempering temperature is 530 ℃.
Tempering insulation time is 120min.
Embodiment 12
The principle of work of medium frequency quenching lathe and lathe is with embodiment 1; Repeat the method for embodiment 1, following difference arranged:
Quenching temperature is 970 ℃, and back timber travelling speed on the medium frequency quenching lathe is 0.62m/min; Spraying quenching device water spray pressure is 1.10Mpa during quenching, and water temperature is 40 ℃.
This batch of back timber material chemical composition content is: C:0.31%, and Si:1.19%, Mn:1.36%, calculate definite according to the tempering temperature formula: tempering temperature is 510 ℃.
Tempering insulation time is 116min.
Claims (8)
1. a back timber mid-frequency induction hardening thermal treatment process comprises and quenching and tempering, it is characterized in that: adopt Medium frequency induction+quenching during quenching, parameters of quenching is as follows: quenching temperature is 930～970 ℃; Back timber travelling speed on the medium frequency quenching lathe is 0.62～0.72m/min; Heating back is by the spraying quenching device cooling of spraying water.
2. back timber mid-frequency induction hardening thermal treatment process according to claim 1 is characterized in that: quenching temperature is 930～939 ℃.
3. back timber mid-frequency induction hardening thermal treatment process according to claim 1 is characterized in that: quenching temperature is 941～959 ℃.
4. back timber mid-frequency induction hardening thermal treatment process according to claim 1 is characterized in that: quenching temperature is 961～970 ℃.
5. according to claim 1 or 2 or 3 or 4 described back timber mid-frequency induction hardening thermal treatment process, it is characterized in that: water spray pressure is 0.9～1.1Mpa during the water spray cooling, and water temperature is 10～40 ℃.
6. according to claim 1 or 2 or 3 or 4 described back timber mid-frequency induction hardening thermal treatment process, it is characterized in that: tempering temperature is calculated according to following formula and is determined; Tempering insulation time is 100～120min,
T (℃)=480 ℃+(C
When-0.5) * 500 ℃
In the formula,
C, Si, Mn are respectively the percentage ratio of carbon in the material, silicon, manganese element content.
7. medium frequency quenching lathe that is applicable to claim 1 or 2 or 3 or 4 described back timber mid-frequency induction hardening thermal treatment process, it is characterized in that: this medium frequency quenching lathe comprises lathe bed 5, is located at well heater 2 and spraying quenching device 3 on the lathe bed 5; End at lathe bed also is provided with drive unit 1, and drive unit 1 is connected with power set 8 by conveyer chain, also is provided with hold-down gear 4 at the other end of lathe bed; Lathe bed is provided with edger roll 6 and the carrying roller 7 of guaranteeing back timber 9 smooth runnings.
8. medium frequency quenching lathe according to claim 7 is characterized in that: the angle of the spout hole axis of described spraying quenching device and back timber traffic direction on lathe is 60～80 degree.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344999A (en) * | 2011-07-21 | 2012-02-08 | 南京迪威尔重型锻造股份有限公司 | Method for determining tempering temperature |
| CN102534143A (en) * | 2010-12-31 | 2012-07-04 | 苏州新凌电炉有限公司 | Novel mesh-belt-type quenching furnace |
| CN103205538A (en) * | 2013-05-07 | 2013-07-17 | 株洲九方热表技术有限公司 | Medium frequency induction quenched-tempered heat treatment method for anti-roll torsion bar of rail transit vehicle |
| CN103866105A (en) * | 2014-03-10 | 2014-06-18 | 苏州捷德瑞精密机械有限公司 | Thermal treatment process of medium-carbon-steel gear |
| CN106086320A (en) * | 2016-08-24 | 2016-11-09 | 常州市玮文金属科技有限公司 | A kind of device quickly carrying out surface induction hardening and annealing |
| CN106435120A (en) * | 2016-11-15 | 2017-02-22 | 石嘴山市凝力机械设备有限公司 | Metal top beam quenching device |
| CN114891995A (en) * | 2022-05-20 | 2022-08-12 | 西安必盛激光科技有限公司 | Method for dynamically controlling laser quenching parameters |
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2007
- 2007-11-15 CN CNA2007101899931A patent/CN101435010A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534143A (en) * | 2010-12-31 | 2012-07-04 | 苏州新凌电炉有限公司 | Novel mesh-belt-type quenching furnace |
| CN102344999A (en) * | 2011-07-21 | 2012-02-08 | 南京迪威尔重型锻造股份有限公司 | Method for determining tempering temperature |
| CN102344999B (en) * | 2011-07-21 | 2012-07-18 | 南京迪威尔高端制造股份有限公司 | Method for determining tempering temperature |
| CN103205538A (en) * | 2013-05-07 | 2013-07-17 | 株洲九方热表技术有限公司 | Medium frequency induction quenched-tempered heat treatment method for anti-roll torsion bar of rail transit vehicle |
| CN103866105A (en) * | 2014-03-10 | 2014-06-18 | 苏州捷德瑞精密机械有限公司 | Thermal treatment process of medium-carbon-steel gear |
| CN103866105B (en) * | 2014-03-10 | 2016-03-30 | 新昌县镜岭镇柳良轴承厂 | A kind of Medium Carbon Steel Gear thermal treatment process |
| CN106086320A (en) * | 2016-08-24 | 2016-11-09 | 常州市玮文金属科技有限公司 | A kind of device quickly carrying out surface induction hardening and annealing |
| CN106435120A (en) * | 2016-11-15 | 2017-02-22 | 石嘴山市凝力机械设备有限公司 | Metal top beam quenching device |
| CN114891995A (en) * | 2022-05-20 | 2022-08-12 | 西安必盛激光科技有限公司 | Method for dynamically controlling laser quenching parameters |
| CN114891995B (en) * | 2022-05-20 | 2024-03-15 | 西安必盛激光科技有限公司 | Method for dynamically controlling laser quenching parameters |
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Open date: 20090520 |