CN204065872U - A kind of temperature control equipment for pulse current thinning metal solidification texture - Google Patents
A kind of temperature control equipment for pulse current thinning metal solidification texture Download PDFInfo
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- CN204065872U CN204065872U CN201420402150.0U CN201420402150U CN204065872U CN 204065872 U CN204065872 U CN 204065872U CN 201420402150 U CN201420402150 U CN 201420402150U CN 204065872 U CN204065872 U CN 204065872U
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 79
- 239000002184 metal Substances 0.000 title claims abstract description 79
- 230000008023 solidification Effects 0.000 title claims abstract description 39
- 238000007711 solidification Methods 0.000 title claims abstract description 39
- 238000006073 displacement reaction Methods 0.000 claims abstract description 106
- 239000000919 ceramic Substances 0.000 claims description 86
- 238000009413 insulation Methods 0.000 claims description 31
- 235000019353 potassium silicate Nutrition 0.000 claims description 26
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 26
- 239000010425 asbestos Substances 0.000 claims description 19
- 229910052895 riebeckite Inorganic materials 0.000 claims description 19
- 239000004576 sand Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 50
- 230000008569 process Effects 0.000 abstract description 30
- 238000005259 measurement Methods 0.000 abstract description 14
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000000137 annealing Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 abstract description 2
- 230000008092 positive effect Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 17
- 229910001018 Cast iron Inorganic materials 0.000 description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 16
- 229910052804 chromium Inorganic materials 0.000 description 16
- 239000011651 chromium Substances 0.000 description 16
- 238000001816 cooling Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 229910000676 Si alloy Inorganic materials 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 2
- 230000010534 mechanism of action Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000005679 Peltier effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model discloses a kind of temperature control equipment for pulse current thinning metal solidification texture, belongs to metal freezing control field.Mainly comprise temperature thermocouple, temperature controls and data collector, displacement and guide piece.The principal character of this device carries out control and measurement when pulsed current annealing metal bath to this process temperature.By temperature thermocouple, metal bath temperature is measured in real time, and adopt temperature control and the temperature of pen recorder to metal bath to control and image data.In the application of this device pulsed current annealing metal bath under tube type resistance furnace heating, advantage is given prominence to, adopt this device can carry out Measurement accuracy to the temperature of metal bath, simple to operate, error is little, and can according to the impact of analysis of data collected pulse current on metal solidification process.During this device paired pulses electric current thinning metal solidification texture, the accurate control of metal bath temperature and the controllability of processing procedure have positive effect.
Description
Technical field
The utility model relates to a kind of temperature control equipment for pulse current thinning metal solidification texture, belongs to metal freezing control field.
Background technology
In materials science field, the control of metal solidification process is the important channel of improving metal material performance and development of new material.Along with modern science and technology develop rapidly, the requirement of people to material property improves constantly, and thus, electric current solidification technology becomes refinement gradually and improves the study hotspot of metal solidification texture method.Electric current solidification technology applies certain electric current to it in metal solidification process or time liquid, as exchange current, DC current or pulse current (Electric Current Pulse, ECP) etc., thus thinning metal solidification texture the method for improving SNR.And in electric current solidification technology, especially most widely used with the method for pulse current thinning metal solidification texture, this technology has pollution-free, Be very effective, the advantage such as easy to operate, and its research work is research direction emerging in recent years, is subject to the great attention of material supplier author.
But, in pulse current thinning metal solidification texture process, be the key of raising metal material quality and processing procedure controllability to the accurate control of metal bath temperature, the mechanism of action of pulse current thinning metal solidification texture mainly contains the following aspects: electromigration effect, Joule effect, Peltier effect, fluctuation effect, skin effect, electromagnetic force effect etc.Heat transfer in pulsed current annealing process, mass transfer and MOMENTUM TRANSMISSION, affect the component distributing of metal, solidified structure and form thereof, and then reach the object of thinning solidification structure.
Temperature variation in metal bath cooling procedure directly affects the thinning effect of metal solidification texture, and at present, the temp measuring method in experimental implementation process mainly contains Thermistor Temperature Measurement, thermal infrared imager thermometric, thermocouple temperature measurement.Although Thermistor Temperature Measurement is simple to operate, there is comparatively big error because temperature-sensing element directly cannot contact testee, measurement range is limited; Although thermal infrared imager thermometric temperature-measuring results is reliable, operating process is complicated, costly, and cannot measure the temperature of molten metal inside; Although common thermocouple thermometric reproducibility and reliability is better, the accurate control to temperature and collection automatically cannot be realized.Therefore, only accomplish the accurate control and measurement to temperature in solidification of metal melt process, effectively could improve the effect of pulse current thinning metal solidification texture and the mechanism of action of paired pulses electric current thinning metal solidification texture is carried out further analysis and probes into.Existing pertinent literature shows, lacks the accurate control and measurement record to metal bath temperature in the lower pulse current thinning metal solidification texture process of tube type resistance furnace heating.
Summary of the invention
For solving the problem lacking the accurate control and measurement record to metal bath temperature in the lower pulse current thinning metal solidification texture process of existing tube type resistance furnace heating, there is provided a kind of control device being applicable to metal bath temperature and fire box temperature in pulse current thinning metal solidification texture process under diamond heating, this device comprises temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3, heat insulation asbestos 4, tube type resistance furnace shaft I 5, ceramic supporting pipe 6, heat-resistant ceramic tube I 7, venthole 8, water glass husky I 9, electrode 10, compensating wire I 11, water glass husky II 12, heat-resistant ceramic tube II 13, tube type resistance furnace shaft II 14, high-voltage pulse power source 15, air admission hole 17, temperature controls and data collector 18, compensating wire II 19, compensating wire III 20, compensating wire IV 21, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is respectively installed to displacement and guide piece I 22, displacement and guide piece II 23, on displacement and guide piece III 24, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are respectively by compensating wire II 19, compensating wire III 20, compensating wire IV 21 controls with temperature and data collector 18 is connected, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are vertically arranged on heat insulation asbestos 4, heat insulation asbestos 4 are positioned at tube type resistance furnace shaft I 5 upper end, ceramic supporting pipe 6 is placed in tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube I 7 is fixed on the ceramic supporting pipe 6 of tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube II 13 is positioned at the inside of heat-resistant ceramic tube I 7, electrode 10 is through heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13, be connected with high-voltage pulse power source 15 by wire I 11, the two ends of heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13 are respectively with water glass husky I 9 and husky II 12 sealings of water glass, the two ends of heat-resistant ceramic tube I 7 are respectively equipped with venthole 8 and air admission hole 17.
One end of temperature thermocouple I 1 described in the utility model, temperature thermocouple III 3 contacts with heat-resistant ceramic tube I 7, and one end of temperature thermocouple II 2 is inserted in the metal bath 16 inside heat-resistant ceramic tube II 13.
Displacement described in the utility model and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are holded up part and are had certain retractility, ensure that the fixing of temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 and move up and down.
Described heat insulation asbestos 4 are provided with cruciform guide rail, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 all can move horizontally along cruciform guide rail, thus temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 also can be moved horizontally.
Described in the utility model, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is S type thermopair, its temperature-measuring range is 0 DEG C ~ 1600 DEG C, by slotting or hole in tube type resistance furnace shaft I 5 upper end, lay displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 do not affect the normal work of tube type resistance furnace, be used for fixing and support temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3, and be temperature thermocouple I 1, temperature thermocouple II 2, the movement of temperature thermocouple III 3 provides guiding.Temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 are arranged on displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 respectively, and ensure temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 upper and lower, move left and right, to measure the temperature of diverse location simultaneously, by branched temperature thermocouple, burner hearth and metal bath 16 temperature are measured simultaneously, and the temperature of diverse location can be contrasted.And then accurately obtain the change of temperature field of burner hearth and metal bath, and the impact of pulse current on metal bath temperature can be analyzed.By compensating wire II 19, compensating wire III 20, compensating wire IV 21 temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 to be controlled with temperature and data collector 18 is connected, the data that record temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 record, shown by data, adjust tube type resistance furnace heating schedule at any time, to control in-furnace temperature and intensification or rate of temperature fall.And then the control reached temperature, under the state passing into pulse current to metal bath, this device can be utilized to measure in real time metal bath temperature, argon gas can be passed in operation and carry out gas shield, avoid metal bath Yin Gaowen and be oxidized.
The beneficial effects of the utility model:
(1) Electric Pulse Treatment device, tube type resistance furnace organically combine by the utility model, easy to operate, be easy to control, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 measurement range comparatively large (0 DEG C ~ 1600 DEG C), temperature-measuring results is reliable, and repeatability better;
(2) temperature described in the utility model control and data collector 18 simple to operate, the automatic collection to data and storage can be realized, and melt temperature variation tendency can be found out according to the temperature recorded, Reasonable adjustment pulse parameter, and then optimize pulsation process;
(3) displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 structure simple, be convenient to temperature thermocouple I 1, temperature thermocouple II 2, the installation of temperature thermocouple III 3, fixing and movement, can Long-Time Service in the temperature survey of this device pulse current thinning metal solidification texture under tube type resistance furnace heating, being applicable to the temperature survey of different metal melt, providing reliable basis for analyzing pulse current to the impact of metal bath temperature and the mechanism of thinning metal solidification texture;
(4) can carry out on the basis of Measurement accuracy and control to temperature, the mechanism of paired pulses electric current thinning metal solidification texture carries out further analysis and research, and realize controllability and the repeatability of operating process, by this device can pulsed current measurement process time different metal melt temperature, use extensively.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model is arranged on tube type resistance furnace;
Fig. 2 is vertical view of the present utility model;
Fig. 3 is the temperature curve that embodiment 1 records;
Fig. 4 is the temperature curve that embodiment 2 records.
In figure: 1-temperature thermocouple I, 2-temperature thermocouple II, 3-temperature thermocouple III, the heat insulation asbestos of 4-, 5-tube type resistance furnace shaft I, 6-ceramic supporting pipe, 7-heat-resistant ceramic tube I, 8-venthole, 9-water glass is husky, 10-electrode, 11-compensating wire I, 12-water glass sand II, 13-heat-resistant ceramic tube II, 14-tube type resistance furnace shaft II, 15-high-voltage pulse power source, 16-metal bath, 17-air admission hole, 18-temperature controls and data collector, 19-compensating wire II, 20-compensating wire III, 21-compensating wire
, 22-displacement and guide piece I, 23-displacement and guide piece II, 24-displacement and guide piece III.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but protection domain of the present utility model is not limited to described content.
Embodiment 1
For the temperature control equipment of pulse current thinning metal solidification texture described in the present embodiment, this device comprises temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3, heat insulation asbestos 4, tube type resistance furnace shaft I 5, ceramic supporting pipe 6, heat-resistant ceramic tube I 7, venthole 8, water glass husky I 9, electrode 10, compensating wire I 11, water glass husky II 12, heat-resistant ceramic tube II 13, tube type resistance furnace shaft II 14, high-voltage pulse power source 15, air admission hole 17, temperature controls and data collector 18, compensating wire II 19, compensating wire III 20, compensating wire IV 21, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is respectively installed to displacement and guide piece I 22, displacement and guide piece II 23, on displacement and guide piece III 24, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are respectively by compensating wire II 19, compensating wire III 20, compensating wire IV 21 controls with temperature and data collector 18 is connected, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are vertically arranged on heat insulation asbestos 4, heat insulation asbestos 4 are positioned at tube type resistance furnace shaft I 5 upper end, ceramic supporting pipe 6 is placed in tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube I 7 is fixed on the ceramic supporting pipe 6 of tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube II 13 is positioned at the inside of heat-resistant ceramic tube I 7, electrode 10 is through heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13, be connected with high-voltage pulse power source 15 by wire I 11, the two ends of heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13 are respectively with water glass husky I 9 and husky II 12 sealings of water glass, the two ends of heat-resistant ceramic tube I 7 are respectively equipped with venthole 8 and air admission hole 17, as shown in Figure 1.
Be example with the temperature survey of pulse current refining eutectic rich chromium cast iron (liquidus temperature 1337 DEG C, solidus temperature 1276 DEG C) solidified structure below, and by reference to the accompanying drawings the use procedure of device described in the utility model be further described:
As shown in Figure 1, hypereutectic high chromium cast iron specimen enclosure is entered in heat-resistant ceramic tube II 13, put into husky I 9 sealings of tube type resistance furnace heat-resistant ceramic tube I 7 two ends water glass and have venthole 8 and air admission hole 17 simultaneously, sample two ends water glass husky II 12 seals and accesses electrode 10, receive on high-voltage pulse power source 15 by electrode 10 and compensating wire I 11, then this temperature measuring equipment is installed, by temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is installed to displacement and guide piece I 22 successively, displacement and guide piece II 23, on displacement and guide piece III 24, then displacement and guide piece are placed in tubular electric resistance furnace upper end, maintenance level.Temperature thermocouple stretches into burner hearth by the groove of tube type resistance furnace or hole, ensures that the temperature thermocouple II 2 measuring metal bath temperature contacts with metal bath 16 simultaneously.By compensating wire II 19, compensating wire III 20, compensating wire IV 21, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 cut-in temperature are controlled and data collector 18.Adjustment tube type resistance furnace heating schedule, (tube type resistance furnace carries temperature thermocouple measuring tempeature fire box temperature to be heated to 1350 DEG C, the fire box temperature that now this temperature measuring equipment records is 1350 DEG C, and the specimen temperature recorded is 1346 DEG C) to carry out stove to sample after 3 minutes cold in insulation, in cooling procedure, apply the high-voltage pulse current of certain parameter simultaneously, and whole process measurement is carried out to burner hearth and specimen temperature.In whole process, pass into argon gas by air admission hole 17 carry out gas shield, prevent metal bath to be oxidized.At the end of insulation, tubular furnace temperature thermocouple and this device temperature thermocouple II 2 record fire box temperature and are 1350 DEG C, and the hypereutectic high chromium cast iron specimen temperature that this device records is 1354 DEG C, the temperature control program of tube type resistance furnace take fire box temperature as standard, therefore, because heat-resistant ceramic tube II 13 has certain insulation effect in insulating process, the temperature of metal bath can have rising to a certain degree when burner hearth is incubated.
In cooling procedure, when the hypereutectic high chromium cast iron temperature that this device records is for its liquidus temperature 1337 DEG C, fire box temperature is 1238 DEG C, and the temperature difference is 99 DEG C.When the hypereutectic high chromium cast iron temperature recorded is for its solidus temperature 1276 DEG C, fire box temperature is 1147 DEG C, and the temperature difference is 129 DEG C.In cooling procedure, due to the insulation effect of heat-resistant ceramic tube II 13 and the impact of pulse current, the cooling velocity of hypereutectic high chromium cast iron sample is far smaller than the cooling velocity of burner hearth, and there is fluctuation of energy in metal solidification process, therefore temperature difference increases gradually in addition.In pulsed current annealing process, the temperature of hypereutectic high chromium cast iron sample and fire box temperature are controlled by temperature and data collector gathers automatically, by the data gathered, draw out thetagram as shown in Figure 3.In Fig. 3, curve 1 is hypereutectic high chromium cast iron sample chilling temperature curve under pulse current effect, and curve 2 is tubular furnace temperature curve of hearth corresponding with it.
Embodiment 2
This device comprises temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3, heat insulation asbestos 4, tube type resistance furnace shaft I 5, ceramic supporting pipe 6, heat-resistant ceramic tube I 7, venthole 8, water glass husky I 9, electrode 10, compensating wire I 11, water glass husky II 12, heat-resistant ceramic tube II 13, tube type resistance furnace shaft II 14, high-voltage pulse power source 15, air admission hole 17, temperature controls and data collector 18, compensating wire II 19, compensating wire III 20, compensating wire IV 21, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is respectively installed to displacement and guide piece I 22, displacement and guide piece II 23, on displacement and guide piece III 24, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are respectively by compensating wire II 19, compensating wire III 20, compensating wire IV 21 controls with temperature and data collector 18 is connected, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are vertically arranged on heat insulation asbestos 4, heat insulation asbestos 4 are positioned at tube type resistance furnace shaft I 5 upper end, ceramic supporting pipe 6 is placed in tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube I 7 is fixed on the ceramic supporting pipe 6 of tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube II 13 is positioned at the inside of heat-resistant ceramic tube I 7, electrode 10 is through heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13, be connected with high-voltage pulse power source 15 by wire I 11, the two ends of heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13 are respectively with water glass husky I 9 and husky II 12 sealings of water glass, the two ends of heat-resistant ceramic tube I 7 are respectively equipped with venthole 8 and air admission hole 17.
Described in the present embodiment, one end of temperature thermocouple I 1, temperature thermocouple III 3 contacts with heat-resistant ceramic tube I 7, and one end of temperature thermocouple II 2 is inserted in the metal bath 16 inside heat-resistant ceramic tube II 13.
Displacement described in the present embodiment and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are holded up part and are had certain retractility, ensure that the fixing of temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 and move up and down; Described heat insulation asbestos 4 are provided with cruciform guide rail, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 all can move horizontally along cruciform guide rail, thus temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 also can be moved horizontally.
Be example with the temperature survey of pulse current refining eutectic rich chromium cast iron (liquidus temperature 1337 DEG C, solidus temperature 1276 DEG C) solidified structure below, and by reference to the accompanying drawings the use procedure of device described in the utility model be further described:
As shown in Figure 1, hypereutectic high chromium cast iron specimen enclosure is entered in heat-resistant ceramic tube II 13, put into husky I 9 sealings of tube type resistance furnace heat-resistant ceramic tube I 7 two ends water glass and have venthole 8 and air admission hole 17 simultaneously, sample two ends water glass husky II 12 seals and accesses electrode 10, receive on high-voltage pulse power source 15 by electrode 10 and compensating wire I 11, then this temperature measuring equipment is installed, by temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is installed to displacement and guide piece I 22 successively, displacement and guide piece II 23, on displacement and guide piece III 24, then displacement and guide piece are placed in tubular electric resistance furnace upper end, maintenance level.Temperature thermocouple stretches into burner hearth by the groove of tube type resistance furnace or hole, ensures that the temperature thermocouple II 2 measuring metal bath temperature contacts with metal bath 16 simultaneously.By compensating wire II 19, compensating wire III 20, compensating wire IV 21, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 cut-in temperature are controlled and data collector 18.Adjustment tube type resistance furnace heating schedule, (tube type resistance furnace carries temperature thermocouple measuring tempeature fire box temperature to be heated to 1350 DEG C, the fire box temperature that now this temperature measuring equipment records is 1350 DEG C, and the specimen temperature recorded is 1345 DEG C) to carry out stove to sample after 3 minutes cold in insulation, in cooling procedure, apply the high-voltage pulse current of certain parameter simultaneously, and whole process measurement is carried out to burner hearth and specimen temperature.In whole process, pass into argon gas by air admission hole 17 carry out gas shield, prevent metal bath to be oxidized.At the end of insulation, tubular furnace temperature thermocouple and this device temperature thermocouple II 2 record fire box temperature and are 1350 DEG C, and the hypereutectic high chromium cast iron specimen temperature that this device records is 1352 DEG C, the temperature control program of tube type resistance furnace take fire box temperature as standard, therefore, because heat-resistant ceramic tube II 13 has certain insulation effect in insulating process, the temperature of metal bath can have rising to a certain degree when burner hearth is incubated.In cooling procedure, when the hypereutectic high chromium cast iron temperature that this device records is for its liquidus temperature 1337 DEG C, fire box temperature is 1232 DEG C, and the temperature difference is 105 DEG C.When the hypereutectic high chromium cast iron temperature recorded is for its solidus temperature 1276 DEG C, fire box temperature is 1155 DEG C, and the temperature difference is 121 DEG C.In cooling procedure, due to the insulation effect of heat-resistant ceramic tube II 13 and the impact of pulse current, the cooling velocity of hypereutectic high chromium cast iron sample is far smaller than the cooling velocity of burner hearth, and there is fluctuation of energy in metal solidification process, therefore temperature difference increases gradually in addition.In pulsed current annealing process, the temperature of hypereutectic high chromium cast iron sample and fire box temperature are controlled by temperature and data collector gathers automatically, by the data gathered, draw out thetagram as shown in Figure 4.In Fig. 4, curve 3 is hypereutectic high chromium cast iron sample chilling temperature curve under pulse current effect, and curve 4 is tubular furnace temperature curve of hearth corresponding with it.
Embodiment 3
For the temperature control equipment of pulse current thinning metal solidification texture described in the present embodiment, this device comprises temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3, heat insulation asbestos 4, tube type resistance furnace shaft I 5, ceramic supporting pipe 6, heat-resistant ceramic tube I 7, venthole 8, water glass husky I 9, electrode 10, compensating wire I 11, water glass husky II 12, heat-resistant ceramic tube II 13, tube type resistance furnace shaft II 14, high-voltage pulse power source 15, air admission hole 17, temperature controls and data collector 18, compensating wire II 19, compensating wire III 20, compensating wire IV 21, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is respectively installed to displacement and guide piece I 22, displacement and guide piece II 23, on displacement and guide piece III 24, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are respectively by compensating wire II 19, compensating wire III 20, compensating wire IV 21 controls with temperature and data collector 18 is connected, displacement and guide piece I 22, displacement and guide piece II 23, displacement and guide piece III 24 are vertically arranged on heat insulation asbestos 4, heat insulation asbestos 4 are positioned at tube type resistance furnace shaft I 5 upper end, ceramic supporting pipe 6 is placed in tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube I 7 is fixed on the ceramic supporting pipe 6 of tube type resistance furnace shaft I 5 both sides, heat-resistant ceramic tube II 13 is positioned at the inside of heat-resistant ceramic tube I 7, electrode 10 is through heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13, be connected with high-voltage pulse power source 15 by wire I 11, the two ends of heat-resistant ceramic tube I 7 and heat-resistant ceramic tube II 13 are respectively with water glass husky I 9 and husky II 12 sealings of water glass, the two ends of heat-resistant ceramic tube I 7 are respectively equipped with venthole 8 and air admission hole 17, as shown in Figure 1.
Be example with the temperature survey of pulse current refinement Al-25%Si alloy (778 DEG C, liquidus temperature line, solidus temperature 577 DEG C) solidified structure below, and by reference to the accompanying drawings the use procedure of device described in the utility model be further described:
As shown in Figure 1, Al-25%Si alloy sample is encapsulated in heat-resistant ceramic tube II 13, put into husky I 9 sealings of tube type resistance furnace heat-resistant ceramic tube I 7 two ends water glass and have venthole 8 and air admission hole 17 simultaneously, sample two ends water glass husky II 12 seals and accesses electrode 10, receive on high-voltage pulse power source 15 by electrode 10 and compensating wire I 11, then this temperature measuring equipment is installed, by temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 is installed to displacement and guide piece I 22 successively, displacement and guide piece II 23, on displacement and guide piece III 24, then displacement and guide piece are placed in tubular electric resistance furnace upper end, maintenance level.Temperature thermocouple stretches into burner hearth by the groove of tube type resistance furnace or hole, ensures that the temperature thermocouple II 2 measuring metal bath temperature contacts with metal bath 16 simultaneously.By compensating wire II 19, compensating wire III 20, compensating wire IV 21, temperature thermocouple I 1, temperature thermocouple II 2, temperature thermocouple III 3 cut-in temperature are controlled and data collector 18.Adjustment tube type resistance furnace heating schedule, (tube type resistance furnace carries temperature thermocouple measuring tempeature fire box temperature to be heated to 800 DEG C, the fire box temperature that now this temperature measuring equipment records is 800 DEG C, and the specimen temperature recorded is 795 DEG C) to carry out stove to sample after 3 minutes cold in insulation, in cooling procedure, apply the high-voltage pulse current of certain parameter simultaneously, and whole process measurement is carried out to burner hearth and specimen temperature.In whole process, pass into argon gas by air admission hole 17 carry out gas shield, prevent metal bath to be oxidized.At the end of insulation, tubular furnace temperature thermocouple and this device temperature thermocouple II 2 record fire box temperature and are 800 DEG C, and the Al-25%Si alloy sample temperature that this device records is 812 DEG C, the temperature control program of tube type resistance furnace take fire box temperature as standard, therefore, because heat-resistant ceramic tube II 13 has certain insulation effect in insulating process, the temperature of metal bath can have rising to a certain degree when burner hearth is incubated.In cooling procedure, when the Al-25%Si alloy temperature that this device records is for its liquidus temperature 778 DEG C, fire box temperature is 702 DEG C, and the temperature difference is 76 DEG C.When the Al-25%Si alloy temperature recorded is for its solidus temperature 577 DEG C, fire box temperature is 473 DEG C, and the temperature difference is 104 DEG C.In cooling procedure, due to the insulation effect of heat-resistant ceramic tube II 13 and the impact of pulse current, the cooling velocity of Al-25%Si alloy sample is far smaller than the cooling velocity of burner hearth, and there is fluctuation of energy in metal solidification process, therefore temperature difference increases gradually in addition.In pulsed current annealing process, the temperature of Al-25%Si alloy sample and fire box temperature are controlled by temperature and data collector gathers automatically, by the data gathered.
Cross this device can pulsed current measurement thinning metal solidification texture time metal bath temperature, the temperature when temperature recorded and the no pulse function of current is contrasted, and contrast with fire box temperature, draw out chilling temperature curve, the mechanism of pulse current on the impact of metal bath and pulse current thinning metal solidification texture can be analyzed further.This device can the temperature of different metal melt under pulsed current measurement effect.During this device paired pulses electric current thinning metal solidification texture, the accurate control of metal bath temperature and the controllability of processing procedure have positive effect.
Claims (4)
1. for a temperature control equipment for pulse current thinning metal solidification texture, it is characterized in that: this device comprises temperature thermocouple I (1), temperature thermocouple II (2), temperature thermocouple III (3), heat insulation asbestos (4), tube type resistance furnace shaft I (5), ceramic supporting pipe (6), heat-resistant ceramic tube I (7), venthole (8), water glass sand I (9), electrode (10), compensating wire I (11), water glass sand II (12), heat-resistant ceramic tube II (13), tube type resistance furnace shaft II (14), high-voltage pulse power source (15), air admission hole (17), temperature controls and data collector (18), compensating wire II (19), compensating wire III (20), compensating wire IV (21), displacement and guide piece I (22), displacement and guide piece II (23), displacement and guide piece III (24), temperature thermocouple I (1), temperature thermocouple II (2), temperature thermocouple III (3) is respectively installed to displacement and guide piece I (22), displacement and guide piece II (23), on displacement and guide piece III (24), displacement and guide piece I (22), displacement and guide piece II (23), displacement and guide piece III (24) are respectively by compensating wire II (19), compensating wire III (20), compensating wire IV (21) controls with temperature and data collector (18) is connected, displacement and guide piece I (22), displacement and guide piece II (23), displacement and guide piece III (24) are vertically arranged on heat insulation asbestos (4), heat insulation asbestos (4) are positioned at tube type resistance furnace shaft I (5) upper end, ceramic supporting pipe (6) is placed in tube type resistance furnace shaft I (5) both sides, heat-resistant ceramic tube I (7) is fixed on the ceramic supporting pipe (6) of tube type resistance furnace shaft I (5) both sides, heat-resistant ceramic tube II (13) is positioned at the inside of heat-resistant ceramic tube I (7), electrode (10) is through heat-resistant ceramic tube I (7) and heat-resistant ceramic tube II (13), be connected with high-voltage pulse power source (15) by wire I (11), the two ends of heat-resistant ceramic tube I (7) and heat-resistant ceramic tube II (13) use water glass sand I (9) and water glass sand II (12) to seal respectively, the two ends of heat-resistant ceramic tube I (7) are respectively equipped with venthole (8) and air admission hole (17).
2. a kind of temperature control equipment for pulse current thinning metal solidification texture according to claim 1, it is characterized in that: one end of temperature thermocouple I (1), temperature thermocouple III (3) contacts with heat-resistant ceramic tube I (7), one end of temperature thermocouple II (2) is inserted in the metal bath (16) of heat-resistant ceramic tube II (13) the inside.
3. a kind of temperature control equipment for pulse current thinning metal solidification texture according to claim 1, it is characterized in that: described displacement and guide piece I (22), displacement and guide piece II (23), displacement and guide piece III (24) are holded up part and had certain retractility, ensure that the fixing of temperature thermocouple I (1), temperature thermocouple II (2), temperature thermocouple III (3) and move up and down.
4. a kind of temperature control equipment for pulse current thinning metal solidification texture according to claim 1, it is characterized in that: described heat insulation asbestos (4) are provided with cruciform guide rail, displacement and guide piece I (22), displacement and guide piece II (23), displacement and guide piece III (24) all can move horizontally along cruciform guide rail.
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| CN104133505A (en) * | 2014-07-21 | 2014-11-05 | 昆明理工大学 | Temperature control device for refining metal solidification structure by use of pulse current |
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| CN104133505A (en) * | 2014-07-21 | 2014-11-05 | 昆明理工大学 | Temperature control device for refining metal solidification structure by use of pulse current |
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