CN103243214A - Heat treatment control system and control method thereof - Google Patents
Heat treatment control system and control method thereof Download PDFInfo
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- CN103243214A CN103243214A CN2013101648159A CN201310164815A CN103243214A CN 103243214 A CN103243214 A CN 103243214A CN 2013101648159 A CN2013101648159 A CN 2013101648159A CN 201310164815 A CN201310164815 A CN 201310164815A CN 103243214 A CN103243214 A CN 103243214A
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Abstract
The invention discloses a heat treatment control system and a control method thereof, and belongs to the field of a metal smelting heat treatment technology. The heat treatment control system comprises a touch screen, a controller and a frequency converter, wherein the controller is connected with the touch screen; the frequency converter adopts a V/F (Voltage/Frequency) full separation technology; and the controller is provided with a temperature monitoring module, a digital-to-analogue conversion module and an analog-to-digital conversion module. According to the invention, several temperature key points can be input on the touch screen and transformed into a temperature curve through depicting treatment, and the controller stores temperature information, then outputs a control signal to the frequency converter and accurately controls the temperature of a heating furnace through the V/F separation technology of the frequency converter and the PID (Proportion Integration Differentiation) intelligent control of the controller to better complete a metallic material heat treatment process, so that the problem that the mechanical property of materials is influenced because a metallurgical structure is incompletely transformed due to overheating or under-heating in a heat treatment process is solved; and the heat treatment time is saved and the energy resource waste is reduced due to accurate control.
Description
Technical field
The present invention relates to metallic substance thermal treatment process control techniques field, be specifically related to a kind of Control System for Heat Treatment and control method.
Background technology
In the metallic substance heat treatment industry, the smelting of metallic substance, annealing and normalizing temperature, quenching and tempering temperature etc. have decisive influence for tissue, mechanical property and the processing characteristics of metallic substance, thereby the control of the temperature of process furnace need be very accurate.The fixed value list parameter automatic regulation system that the humidity control system that existing heat treatment furnace is used generally all is made up of temperature-sensing element, instruments on base and performer, what thermal treatment process all adopted usually is the control scheme that furnace temperature is remained on a given numerical value.In the actual use, the general more complicated of the heat treatment process of workpiece need to divide a plurality of stages and under different temperature condition workpiece is heat-treated, thereby temperature adjustment number of times is more frequent.If temperature control is inaccurate in heat treatment process, be easy to occur " overheated " phenomenon, when temperature surpasses preset temp, the diffusion movement of its atom is easy to carry out, and therefore crystal grain also increase, and produces thick austenite crystal, and thick austenite crystal cools off the transmutation product of the same coarse grain that can become down afterwards, thereby make the mechanical property of steel, particularly notched bar impact strength significantly descends, and causes quenching process distortion or cracking phenomena.
In the prior art, heat treatment technics mainly is the temperature of monitoring record process furnace, sends prompting then, after people receive prompting, manually heat treated next step is operated.Such technology level of automation is not high, and temperature control is inaccurate, causes production efficiency low, and thermal treatment quality is not up to standard, and the waste resource, has increased cost.
Summary of the invention
The embodiment of the invention provides a kind of Control System for Heat Treatment and the control method thereof that can accurately control furnace temp according to the technological temperature curve of input, controls inaccurate problem with furnace temp in the solution heat treatment process.
In order to address the above problem, the present invention is achieved by following technical scheme:
A kind of Control System for Heat Treatment of the present invention, comprise for the touch-screen that shows furnace temp, the controller that is connected with touch-screen and in being placed on process furnace and the one or more temperature sensors that are connected with controller, be connected with the frequency transformer for the adjusting furnace temp between described controller and the process furnace; Described controller is used for the described frequency transformer of control and regulates furnace temp.
Further, described controller comprises temperature monitoring module, D/A converter module and the analog-to-digital conversion module for detection of temperature.
Further, for the temperature of more flexible control process furnace, described frequency transformer is that voltage/frequency separates frequency transformer entirely.
Further, the described temperature sensor that is placed in the process furnace is occasionally J type thermopair of K type thermoelectricity.
A kind of thermal treatment control method comprises:
Controller is sent to frequency transformer with the temperature data that receives;
Described frequency transformer is regulated the temperature of process furnace according to described temperature data;
The temperature of monitoring control devices process furnace, when temperature data that described furnace temp value equals to receive, described controller control frequency transformer stops furnace temp being regulated.
Described controller is controlled described frequency transformer described furnace temp is regulated, and comprising:
When described furnace temp was higher than the described temperature data that receives, described controller was controlled described frequency transformer described furnace temp is reduced, or,
When described furnace temp was lower than the described temperature data that receives, described controller was controlled described frequency transformer described furnace temp is raise.
The temperature of described controller or periodic monitor described process furnace real-time by the temperature sensor in the described process furnace.
Before described controller is sent to frequency transformer with the temperature data that receives, comprising:
Described controller is drawn temperature curve according to described temperature data, and described temperature curve is presented on the touch-screen.
Compared with prior art, the invention has the beneficial effects as follows:
1, by the key point of touch-screen input temp curve, through digital-to-analog conversion, forms process curve output, can compare control, analyze with former art breading curve, improve the thermal treatment control quality.
2, adopt the full isolation technique of voltage/frequency in the frequency transformer, body of heater power temperature is regulated in real time, reduced the loss of energy, reach purpose of energy saving, and guaranteed heat treated quality.
3, frequency transformer, controller and A/D, A/D module are formed closed loop feedback control, and furnace body temperature is controlled in the PID control of recycling controller more accurately.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail, wherein:
Fig. 1 is system's control chart of the embodiment of the invention one;
Fig. 2 is the embodiment of the invention one middle controller and module I/O (Input/Output, I/O) wiring scheme;
Fig. 3 is body of heater operation and the control signal master chart of the embodiment of the invention one;
Fig. 4 is 9Mn2V die steel carbide annealing process graphic representation.
Among the figure: 1-touch-screen, 2-controller, 21-temperature monitoring module, 22-D/A converter module, 23-analog-to-digital conversion module, 3-frequency transformer, 4-process furnace, 5-K type thermopair.
Embodiment
As Fig. 1～shown in Figure 3, a kind of Control System for Heat Treatment of the present invention, the controller 2 that comprises touch-screen 1, is connected with touch-screen 1 by serial ports (for example RS242 or RS244), the frequency transformer 3 that is connected with controller 2 by serial ports and the K type thermopair 6 that is positioned over different positionss in the process furnace 4 and is connected with controller.
Described controller 2 comprises temperature monitoring module 21, D/A converter module 22 and analog-to-digital conversion module 23, for example, can adopt remittance river H2U-2624, need to prove, the above-mentioned controller that provides is provided the embodiment of the invention, and any controller that has temperature monitoring 21 modules, digital-to-analogue 22 and analog-to-digital conversion module 23 all can be used as the controller of the embodiment of the invention; Described frequency transformer 3 has the full isolation technique of voltage/frequency, for example, can adopt MD380, need to prove, the above-mentioned frequency transformer that provides is provided the embodiment of the invention, and any frequency transformer that has the full isolation technique of voltage/frequency all can be used as the frequency transformer in the embodiment of the invention; Described frequency transformer 3 is formed closed loop feedback control with controller 2 and temperature sensor 5.Described temperature sensor 5 is K type thermopair, and this temperature sensor 5 is connected with temperature monitoring module 31.
According to Fig. 1～shown in Figure 3, connect H2U-2624 controller 2 and MD380 frequency transformer 3, the Y10 end of H2U-2624 controller 2 is connected with power input R, S, the T of MD380 frequency transformer 3 by air beginning KM1; By air beginning KM2, be connected with load output terminal U, V, the W of MD380 frequency transformer 3; The Y17 end of H2U-2624 controller 2 is connected with the DI1 terminal of MD380 frequency transformer 3, and the COM5 end of H2U-2624 controller 2 is connected with the GND terminal of MD380 frequency transformer 3.And the AI2 of MD380 frequency transformer 3 is connected with analog-to-digital conversion module, forms closed control circuit.
Carbide annealing process with 9Mn2V die steel is example below, and the method for work of a kind of Control System for Heat Treatment of the present invention is described:
As shown in Figure 4, wherein 723 ℃ is the Ac1 temperature, be that perlite is to the beginning temperature of austenitic transformation, the timed interval of AB is 3 hours, the timed interval of CD is 6 hours, at first according to the carbide annealing process graphic representation of 9Mn2V die steel, with 760 ℃ on the process curve, 723 ℃, 700 ℃ and 500 ℃ of these several temperature key points are by touch-screen 1 input, demonstrate the curve of technological temperature after the input on the display screen, and with this temperature data through serial ports (RS232 for example, RS485 etc.) be delivered to controller, controller output signal is given frequency transformer, thereby process furnace 4 is heated, furnace temperature rises to 780 ℃, PID through programmable processor 3 regulates, and furnace temperature drops to 760 ℃, and then is heated to 780 ℃, drop to 760 ℃ again, so circulated 3 hours.Begin to have a power failure, carry out nature be cooled to 680 ℃ after controller send control command again, start frequency transformer 3 work, after temperature rises to 700 ℃, by the PID adjusting of programmable processor 3, heat up 700 ℃ again after making furnace temperature reduce to 680 ℃, so circulation is 6 hours, cools to 500 ℃ then naturally, opens door, allow the process furnace naturally cooling, end of processing.
As Fig. 2～shown in Figure 3, body of heater heating operational process, the QF1 air switch closes, touch-screen, frequency transformer MD380, controller H2U-2624 and relevant module are started working, body of heater begins to heat up, temperature sensor 5 feedback temperature analog quantitys in the temperature monitoring module 21, via controller 2 carries out modulus to be handled, result is carried out modulus output by D/A module 22 and A/D module 23, wherein the AI2 of the simulating signal of D/A output and MD380 forms the closed loop feedback pilot circuit, again by the full isolation technique of V/F of MD380 and the PID regulating and controlling of H2U-2624, its output signal is increased, strengthen the voltage output of MD380, make furnace body temperature obtain fast rise.In heat-processed, controller is once adjusted signal according to the temperature data of process curve with output in per 0.2～0.5 second, this signal and H2U-2624 controller 2, temperature sensor 5, MD380 frequency transformer 3 grades form system's closed-loop control, after reaching target value, control product 3 able to programme are through the PID computing, its output signal is reduced, the output signal of MD380 reduces thereupon, thereby the temperature of process furnace 4 is descended, through the temperature and the original technological temperature curve contrast of importing that real-time monitors, continue to send the adjustment signal, can be flexibly, control the temperature of process furnace 4 exactly, improve heat treated quality, saved the energy, simplified operation, improved production efficiency, the present invention can be widely used in the heat treatment technics field.
Other structure of the described a kind of Control System for Heat Treatment of present embodiment is referring to prior art.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, so every technical solution of the present invention content that do not break away from,, all still belong in the scope of technical solution of the present invention any modification, equivalent variations and modification that above embodiment does according to technical spirit of the present invention.
Claims (9)
1. Control System for Heat Treatment, comprise for the touch-screen that shows furnace temp, the controller that is connected with touch-screen and in being placed on process furnace and the one or more temperature sensors that are connected with controller, it is characterized in that: be connected with the frequency transformer for the adjusting furnace temp between described controller and the process furnace; Described controller is used for the described frequency transformer of control and regulates furnace temp.
2. according to each described Control System for Heat Treatment of claim 1-3, it is characterized in that described controller comprises temperature monitoring module, D/A converter module and the analog-to-digital conversion module for detection of temperature.
3. according to each described Control System for Heat Treatment of claim 1-3, it is characterized in that: described frequency transformer is that voltage/frequency separates frequency transformer entirely.
4. according to the described Control System for Heat Treatment of claim 1, it is characterized in that: described touch-screen is connected by serial ports with controller, and described controller is connected by serial ports with frequency transformer.
5. according to the described Control System for Heat Treatment of claim 1, it is characterized in that: described temperature sensor is occasionally J type thermopair of K type thermoelectricity.
6. a thermal treatment control method is characterized in that, comprising:
Controller is sent to frequency transformer with the temperature data that receives;
Described frequency transformer is regulated the temperature of process furnace according to described temperature data;
The temperature of monitoring control devices process furnace, when temperature data that described furnace temp value equals to receive, described controller control frequency transformer stops furnace temp being regulated.
7. thermal treatment control method according to claim 6 is characterized in that, described controller is controlled described frequency transformer described furnace temp is regulated, and comprising:
When described furnace temp was higher than the described temperature data that receives, described controller was controlled described frequency transformer described furnace temp is reduced, or,
When described furnace temp was lower than the described temperature data that receives, described controller was controlled described frequency transformer described furnace temp is raise.
8. thermal treatment control method according to claim 6 is characterized in that, the temperature of described controller or periodic monitor described process furnace real-time by the temperature sensor in the described process furnace.
9. thermal treatment control method according to claim 6 is characterized in that, before described controller is sent to frequency transformer with the temperature data that receives, comprising:
Described controller is drawn temperature curve according to described temperature data, and described temperature curve is presented on the touch-screen.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107992697A (en) * | 2017-12-13 | 2018-05-04 | 沈阳东博热工科技有限公司 | A kind of vacuum heat treatment process simulation and technique optimization method |
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Application publication date: 20130814 |