CN109047599A - A kind of bar heating device and method for upsetting - Google Patents
A kind of bar heating device and method for upsetting Download PDFInfo
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- CN109047599A CN109047599A CN201810891097.8A CN201810891097A CN109047599A CN 109047599 A CN109047599 A CN 109047599A CN 201810891097 A CN201810891097 A CN 201810891097A CN 109047599 A CN109047599 A CN 109047599A
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- temperature
- bar
- core
- upsetting
- induction heater
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Induction Heating (AREA)
Abstract
The invention discloses a kind of bar heating device and method for upsetting, heating device includes induction heater, controller, variable-frequency power sources and infrared radiation thermometer；Bar is placed in induction heater, and induction heater makes bar successively decrease to upsetting end to the temperature linearity of required position；Infrared radiation thermometer is respectively aligned to billet surface and core, the bar temperature of measurement is passed to controller by infrared radiation thermometer, controller is by the surface temperature measured, core temperature respectively compared with set temperature, it controls variable-frequency power sources and the core table temperature difference is controlled into the discharging when core temperature reaches set temperature within the set range.Present system is simple, can make to realize longitudinal gradient temperature after the completion of bar heating, while by the control of the core table temperature difference in technique claimed range.
Description
Technical field
The present invention relates to metal working technical areas, and in particular to a kind of bar heating device and method for upsetting.
Background technique
Bar work obtains uniform radial temperature after induction heating, but during upsetting because bar by
Extruding can generate heat, and heat can conduct backward from end, cause longitudinal temperature uneven, different temperature forms different groups
Transformation form is knitted, causes bar longitudinal direction performance inconsistent.
Secondly, theoretical research shows that induction heating bar can generate the core table temperature difference, and the main reason for cause this result
It is kelvin effect, and pursues high-frequency used by high efficiency.Therefore, the core table temperature difference is controlled in acceptable range
It is interior, the rate of heat transfer must be effectively controlled in the case where frequency is constant.In the prior art, surface temperature and core temperature are adopted
With the control mode of closed loop, system complex, surface temperature and core temperature can be generated and be interfered with each other when adjusting.
Summary of the invention
In view of this, system is simple, can make the present invention provides a kind of bar heating device and method for upsetting
Longitudinal gradient temperature is realized after the completion of bar heating, while by the control of the core table temperature difference in technique claimed range.
Specific embodiments of the present invention are as follows:
A kind of bar heating means for upsetting, the bar are placed in induction heater, pass through induction heater
Bar is set to successively decrease to upsetting end to the temperature linearity of required position；
Meanwhile within the set range by the control of the bar core table temperature difference, the discharging when core temperature reaches set temperature.
Further, described that the core table temperature difference is controlled into the discharging when core temperature reaches set temperature within the set range
Method particularly includes: measurement bar surface temperature passes to controller, the controller surface temperature and the first setting temperature
Degree, then operation, which generates, adjusts analog signals output, and control variable-frequency power sources makes billet surface be stabilized to the first set temperature, directly
The second set temperature is reached to core temperature；Measurement bar core temperature passes to controller, sets when core temperature reaches second
When determining temperature, controller control bar is come out of the stove.
Further, linear increment, outer profile are formed the induction coil diameter in the induction heater in the axial direction
Round table-like, for bus horizontal by certain angle, the small end of induction coil, which is wound on, forges bar end to pier.
Further, the infrared radiation thermometer of the alignment billet surface is distributed in induction heater interval, passes through bar
The temperature value of each temperature measuring point feedback in surface adjusts the heating intensity of induction coil, makes bar to upsetting end to required position
Temperature reaches required temperature.
A kind of bar heating device for upsetting, the heating device include induction heater, controller, variable-frequency power sources
And infrared radiation thermometer；
Bar is placed in induction heater, and induction heater makes bar from the temperature line to upsetting end to required position
Property is successively decreased；The infrared radiation thermometer is respectively aligned to billet surface and core, and infrared radiation thermometer passes to the bar temperature of measurement
Controller, controller is by the surface temperature measured, core temperature respectively compared with set temperature, and control variable-frequency power sources is by core table temperature
Difference controls the discharging when core temperature reaches set temperature within the set range.
The utility model has the advantages that
Induction coil configuration of the present invention makes bar to upsetting end to the linear decline trend of the temperature of required position,
Bar end region temperature highest, it is possible to reduce initial pressure when upsetting, while temperature is carried out using the heat generated in extrusion process
" gradient " compensation reaches upsetting regional temperature equilibrium, guarantees the homogeneity of bar upsetting overall performance；Secondly, by the core table temperature difference
Control is used using surface temperature as control object, in a manner of core temperature control discharging, is avoided in technique claimed range
Interfering with each other when surface temperature and core temperature are adjusted simultaneously, also simplifies system software.
Detailed description of the invention
Fig. 1 is bar heating schematic diagram；
Fig. 2 is induction coil outline structural diagram；
Fig. 3 is bar core table temperature control principle figure.
Wherein, 1- insulation shell, 2- induction coil, 3- infrared radiation thermometer, 4-PLC, 5- temperature controller, 6- variable-frequency power sources, 7-
Industrial personal computer, 8- bar, 9- peep hole.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present invention provides a kind of bar heat protocol for upsetting, basic thoughts are as follows: bar is placed in induction and is added
In hot stove, bar is set to successively decrease to upsetting end to the temperature linearity of required position by induction heater；Meanwhile by bar core
The table temperature difference controls the discharging when core temperature reaches set temperature in technique claimed range.It can use induction heater point
Section setting hot spot realizes that temperature linearity is successively decreased, and more simple scheme is to utilize the induction coil configuration in induction heater
Form is realized.Based on above-mentioned thought, a kind of bar heating device for upsetting is present embodiments provided, comprising: induction adds
Hot stove, infrared radiation thermometer 3, PLC4, temperature controller 5, variable-frequency power sources 6 and industrial personal computer 7, as shown in Figure 1.
Induction heater is made of insulation shell 1 and induction coil 2,2 diameter of induction coil linear increment in the axial direction,
Outer profile forms round table-like, and bus is horizontal by β angle, as shown in Figure 2.The process section of α workpiece upsetting, γ be adjustment away from
From α is usually determined by the production technology of bar 8.Insulation shell 1 is equipped with peep hole 9, provides for external infrared radiation thermometer 3
The channel of measuring stick material temperature degree.
Infrared radiation thermometer 3 is used to measure the temperature of 8 surface of bar and core, therefore is respectively aligned to surface and the stick of bar 8
The core of material 8, and the infrared radiation thermometer 3 for measuring surface temperature is distributed in induction heater interval.
Bar is shown below in the mathematical model of extrusion process temperature gradient:
Δ t is temperature gradient in formula,It is average unit pressure, m is the conversion coefficient that plastic power is converted to heat, m=
0.96, D1、D2The diameter of forward and backward bar is respectively forged and pressed, ρ is bar material density, and c is specific heat.Therefore deduce that bar reality
When border works under set temperature 1 each temperature measuring point of bar theoretical temperature value, i.e. temperature gradient.β and γ is adjusted, is felt by adjusting
The heating intensity (current density) of coil is answered, so that each temperature measuring point reaches theoretical temperature value to bar when heated.
Bar 8 is placed in induction heater, the small end of induction coil 2 is wound on 8 end of bar to upsetting, sets respectively
It sets infrared radiation thermometer 3 and 8 surface of bar and core is directed at by the peep hole 9 of induction furnace.When heating, by monitoring 8 surface of bar
The temperature value of each temperature measuring point feedback is adjusted, and bar 8 is made linearly to successively decrease to upsetting end to the temperature of required position
Gesture.
Meanwhile it using using 8 surface temperature of bar as control object, in a manner of core temperature control discharging, i.e. surface temperature
Heat preservation waits core temperature after degree reaches the first set temperature, discharges immediately after core to the second set temperature.As shown in figure 3,
Concrete operations are as follows: the temperature that the infrared radiation thermometer 3 middle part outside induction heater is arranged in measures is infrared as skin temperature benchmark
The measurement temperature on surface layer and core is passed to the AI module of PLC4 by temperature measurer 3, and AI module is by the observed temperature on surface and first
Set temperature is compared, and is then generated adjusting analog signals through operation and is exported by AO module to temperature controller 5, then by temperature controller
5 control variable-frequency power sources 6 in a manner of PID makes 8 surface-stable of bar to the first set temperature, and each parameter of PID is adjusted in advance, is waited
Core temperature reaches the second set temperature.When the measurement temperature of core reaches the second set temperature, the on-off model of PLC4
Bar 8 is set to come out of the stove by the quickly discharging mechanism that DO module is output to mechanical system.
PLC4 is controlled using the special-purpose software of exploitation by industrial personal computer 7, to control the thought of heating time and current density,
And control program has been worked out with means such as the time sequential pulse way of outputs, and highly sensitive, high performance regulation link is increased, it is defeated
Out to temperature controller 5, to control 6 output power of variable-frequency power sources.The expert PID function of controlling program and temperature controller 5 by PLC4 is total
Same-action controls variable-frequency power sources 6, forms more effective closed-loop control.
In the present embodiment, it is desirable that the core table temperature difference is no more than 20 DEG C.In test, set temperature according to the technological requirements depending on, stick
Expect that first set temperature on surface uses 1170 DEG C, the second set temperature of bar core uses 1150 DEG C, when heating, core table temperature
Degree is steady to be risen；Core table temperature difference effect when discharging simultaneously, substantially no more than 20 DEG C.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. a kind of bar heating means for upsetting, which is characterized in that the bar is placed in induction heater, passes through sense
Answer heating furnace that bar is made to successively decrease to upsetting end to the temperature linearity of required position；
Meanwhile within the set range by the control of the bar core table temperature difference, the discharging when core temperature reaches set temperature.
2. being used for the bar heating means of upsetting as described in claim 1, which is characterized in that described that the control of the core table temperature difference exists
It in setting range, discharges when core temperature reaches set temperature method particularly includes: measurement bar surface temperature passes to control
Device processed, the controller surface temperature and the first set temperature, then operation, which generates, adjusts analog signals output, control
Variable-frequency power sources makes billet surface be stabilized to the first set temperature, until core temperature reaches the second set temperature；Measure bar core
Portion's temperature passes to controller, and when core temperature reaches the second set temperature, controller control bar is come out of the stove.
3. being used for the bar heating means of upsetting as described in claim 1, which is characterized in that the sense in the induction heater
Answer coil diameter linear increment in the axial direction, outer profile forms round table-like, and bus is horizontal by certain angle, induction coil
Small end be wound on to pier forge bar end.
4. being used for the bar heating means of upsetting as described in claim 1, which is characterized in that described to be directed at the red of billet surface
Outer temperature measurer is distributed in induction heater interval, adjusts induction coil by the temperature value of each temperature measuring point feedback of billet surface
Heating intensity makes bar reach required temperature to upsetting end to the temperature of required position.
5. a kind of bar heating device for upsetting, which is characterized in that the heating device includes induction heater, control
Device, variable-frequency power sources and infrared radiation thermometer；
Bar is placed in induction heater, and induction heater passs bar to upsetting end to the temperature linearity of required position
Subtract；The infrared radiation thermometer is respectively aligned to billet surface and core, and the bar temperature of measurement is passed to control by infrared radiation thermometer
Device, controller is by the surface temperature measured, core temperature respectively compared with set temperature, and control variable-frequency power sources is by core table temperature difference control
Make the discharging when core temperature reaches set temperature within the set range.
6. being used for the bar heating device of upsetting as claimed in claim 5, which is characterized in that the sense in the induction heater
Answer coil diameter linear increment in the axial direction, outer profile forms round table-like, and bus is horizontal by certain angle, induction coil
Small end be wound on to pier forge bar end.
7. being used for the bar heating device of upsetting as claimed in claim 5, which is characterized in that described to be directed at the red of billet surface
Outer temperature measurer is distributed in induction heater interval, adjusts induction coil by the temperature value of each temperature measuring point feedback of billet surface
Heating intensity makes bar reach linear decrease to upsetting end to the temperature of required position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810891097.8A CN109047599A (en) | 2018-08-07 | 2018-08-07 | A kind of bar heating device and method for upsetting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810891097.8A CN109047599A (en) | 2018-08-07 | 2018-08-07 | A kind of bar heating device and method for upsetting |
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| CN109047599A true CN109047599A (en) | 2018-12-21 |
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| CN201810891097.8A Pending CN109047599A (en) | 2018-08-07 | 2018-08-07 | A kind of bar heating device and method for upsetting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109877269A (en) * | 2019-03-21 | 2019-06-14 | 攀钢集团成都钛材有限公司江油分公司 | A kind of temperature control method of radial precision forging titanium or titanium alloy bar |
| CN112355230A (en) * | 2020-10-20 | 2021-02-12 | 中国第二重型机械集团德阳万航模锻有限责任公司 | High-temperature alloy bar blank heating device and heating method for shaft forgings |
| CN113102669A (en) * | 2021-03-29 | 2021-07-13 | 杭州汽轮铸锻有限公司 | 20Cr13 upsetting heating device and upsetting heating process |
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| JPS63223129A (en) * | 1987-03-12 | 1988-09-16 | Fuji Electric Co Ltd | Billet heater |
| CN101029348A (en) * | 2007-03-27 | 2007-09-05 | 西部钛业有限责任公司 | Process for heating titanium oblique perforating rod ingot |
| CN101105368A (en) * | 2007-08-15 | 2008-01-16 | 苏州工业园区华福科技有限公司 | Line-frequency induction gradient temperature heating oven |
| CN101665894A (en) * | 2009-10-06 | 2010-03-10 | 深圳市欧帝光学有限公司 | Heat-treatment method and equipment for nickel-titanium shape memory alloy |
| CN102641959A (en) * | 2012-05-08 | 2012-08-22 | 哈尔滨工业大学 | Rapid uniform heating method for metal tube |
| CN103313449A (en) * | 2013-05-14 | 2013-09-18 | 上海超导科技股份有限公司 | Induction heating apparatus and induction heating method thereof |
| CN105821185A (en) * | 2016-05-30 | 2016-08-03 | 吉林大学 | Gradient induction heating device for high-strength steel |
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2018
- 2018-08-07 CN CN201810891097.8A patent/CN109047599A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63223129A (en) * | 1987-03-12 | 1988-09-16 | Fuji Electric Co Ltd | Billet heater |
| CN101029348A (en) * | 2007-03-27 | 2007-09-05 | 西部钛业有限责任公司 | Process for heating titanium oblique perforating rod ingot |
| CN101105368A (en) * | 2007-08-15 | 2008-01-16 | 苏州工业园区华福科技有限公司 | Line-frequency induction gradient temperature heating oven |
| CN101665894A (en) * | 2009-10-06 | 2010-03-10 | 深圳市欧帝光学有限公司 | Heat-treatment method and equipment for nickel-titanium shape memory alloy |
| CN102641959A (en) * | 2012-05-08 | 2012-08-22 | 哈尔滨工业大学 | Rapid uniform heating method for metal tube |
| CN103313449A (en) * | 2013-05-14 | 2013-09-18 | 上海超导科技股份有限公司 | Induction heating apparatus and induction heating method thereof |
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| 胡亚民等: "《摆动辗压工艺及模具设计》", 31 December 2001, 重庆大学出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109877269A (en) * | 2019-03-21 | 2019-06-14 | 攀钢集团成都钛材有限公司江油分公司 | A kind of temperature control method of radial precision forging titanium or titanium alloy bar |
| CN112355230A (en) * | 2020-10-20 | 2021-02-12 | 中国第二重型机械集团德阳万航模锻有限责任公司 | High-temperature alloy bar blank heating device and heating method for shaft forgings |
| CN113102669A (en) * | 2021-03-29 | 2021-07-13 | 杭州汽轮铸锻有限公司 | 20Cr13 upsetting heating device and upsetting heating process |
| CN113102669B (en) * | 2021-03-29 | 2023-06-23 | 杭州汽轮铸锻有限公司 | 20Cr13 upsetting heating device and upsetting heating process |
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Application publication date: 20181221 |