CN104826997B - Cast rising head induction heating apparatus and casting rising head induction heating method - Google Patents

Cast rising head induction heating apparatus and casting rising head induction heating method Download PDF

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CN104826997B
CN104826997B CN201510186969.7A CN201510186969A CN104826997B CN 104826997 B CN104826997 B CN 104826997B CN 201510186969 A CN201510186969 A CN 201510186969A CN 104826997 B CN104826997 B CN 104826997B
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rising head
annulus
casting
induction coil
induction heating
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CN104826997A (en
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向青春
邱克强
张伟
曲迎东
李荣德
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Shenyang University of Technology
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Shenyang University of Technology
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Abstract

One kind casting rising head induction heating apparatus, it is characterised in that:The device includes annulus set, induction coil, thermocouple, water-cooled cable, moisture recorder and the induction heating power case that riser buss, graphite cannula, steel bushing or other conductive materials are made;Compared with existing insulated feeder and exothermic riser, the invention has the advantages that:Extension rising head setting time effect is more notable than insulated feeder and exothermic riser, can realize that the real-time control to rising head inner metal liquid temperature, sensing heating rising head can be recycled, environmental pollution is not resulted in during, use low with respect to production cost, more meets environmental requirement.

Description

Cast rising head induction heating apparatus and casting rising head induction heating method
Technical field
The present invention relates to machinery manufacturing industry, specifically a kind of rising head sensing suitable for casting field castings production Different sizes, by adjusting the input power of electromagnetic induction coil, are emitted intraoral molten metal by heating means and its process unit Sensing heating is carried out, so as to improve the feeding efficiency of rising head, reduces Riser Dimensions, saves material and the energy, and reduce casting Part produces shrinkage cavity and shrinkage defect, improves the internal soundness of casting.Be particularly suitable for use in the rising head of large-scale steel-casting.
Background technology
During castings production, the rising head of certain amount and size is typically set, when being shunk to supplement casting solidification Required molten metal, it is to avoid casting produces shrinkage cavity and porosity defect, it is ensured that obtain the casting with good internal soundness.Rising head Volume and quantity typically determined by the planform and volume of casting, in rising head supplement liquation total amount typically constitute from casting weight The 30%~60% of amount, and actual liquation supplement usage amount only accounts for 10% or so, the surplus of supplement liquation is up to 90% or so.And And, rising head need to be cut separated with casting after melted again as foundry returns, therefore waste mass energy, increase castings production into This.Such as the large-size propeller of current domestic production, in order to realize feeding, its Riser Dimensions is very big, and rising head accounts for the 22% of casting weight ~30%, raw material are wasted, cause process outlet rate low;And rising head is big, cutting is difficult, re-uses also highly difficult.
In order to improve the feeding efficiency of rising head, casting process yield is improved, vocal imitation skill development is emitted via common at present To application it is a variety of it is special emit vocal imitation skill, such as insulated feeder, exothermic riser, heating rising head and pressure feeder, present castings production In the more commonly used method be to use insulated feeder and exothermic riser.Insulated feeder and exothermic riser are easy to use, in certain journey The feeding efficiency of rising head is improved on degree, but for heavy castings, because the casting solidification time is long, therefore it is required that emitting The setting time of intraoral molten metal be also required to it is long, such insulated feeder and exothermic riser effect just not substantially, the benefit of rising head Contracting efficiency is still relatively low.
Also castings production is carried out in current industrial production with the method for heating rising head.Heating rising head is divided into resistance heating again Rising head, electric arc heated rising head, electroslag heating rising head etc..These prior arts pass through electric arc, plasma or chemical heat method pair Riser heating is incubated, to compensate rising head thermal loss, improves the feeding capacity of rising head, but the heat that they are inputted is concentrated mainly on Near calandria, there are problems that heating surface (area) (HS is small, the thermal efficiency is low and pollutes.In recent years, sensing heating is have also appeared to emit Mouthful, mainly using inductive heating principle, to emitting, intraoral molten metal is heated, and improves the feeding efficiency of rising head.
Chinese patent CN102350485A has invented a kind of medium-frequency electrical heating billet steel cast shrinkage hole compensation device and technique, is used for Steel embryo casting shrinkage.The patent is in punching block top assembling cast rising head, and rising head is suppressed with quartz sand mixing sodium silicate, outside rising head Load coil is cased with, is connected with Frequency Induction Heating power distribution cabinet.Induction coil is powered by molten steel in time after casting is filled Heating, then gradually reduces electric current, makes to emit intraoral liquid steel temperature by 100 DEG C per minute ~ 120 DEG C speed coolings until having solidified Finish.This invention significantly reduces rising head cooling velocity, product qualification rate is greatly improved.But this patent of invention is only fitted For steel ingot production, and molten steel is directly to enter from riser gating in steel mold cavity, is only just powered after pouring molten steel is full Heating.Moreover, the magnetic line of force dissipated in the patent to swage sensing heating during swage by that can reduce the cooling capacity of swage.
Chinese patent CN103212675A has invented a kind of Steel ingot feeder head sensing heating and electromagnetic mixing apparatus, for black And the heating and thermal insulation and electromagnetic agitation at nonferrous materials ingot casting rising head position.The patent is hung down outside the riser head heat-preserving set of steel ingot Multigroup induction coil is directly placed, three phase worker power cabinet is connected by water-cooled cable.After switching on power, the molten steel in rising head is entered The thermal loss of riser metal liquid, delays the solidification process of rising head, improves rising head in row sensing heating, compensation During Ingot Solidification Feeding capacity, while form magnetic field around rising head, the effect of electromagnetic agitation is produced to metal bath in the presence of this magnetic field Really, be conducive to excluding the gas and field trash in metal bath, improve ingot quality.This patent of invention is equally also only applied to Steel ingot is produced, and is also that heating is just initially powered up after molten steel is poured at the top of rising head.
Chinese utility model patent CN202316980U discloses a kind of casting rising head induction heating apparatus, and the patent is inverse Series capacitor and an at least secondary induction coil in power transformation source follower circuit, every secondary induction coil correspondence are set in one and emit cup On outer wall, so as to emit cup using the relatively ting model smaller than normal rising head, can so reduce molten metal total amount and Molten metal utilization rate, up to more than 95%, greatly reduces thermal waste and saves electricity in the surplus of metal, rising head in rising head Energy.The patent is also after pouring metal melt is finished, to start induction heating power, the molten metal emitted in cup is sensed Heating.
It can be seen that, current sensing heating rising head method and apparatus are just to start sensing heating after pouring metal melt is finished Power supply, so as to carry out sensing heating insulation to molten metal in rising head using inductive heating principle.And because Riser material is led to be non- Electric material, if not being filled with molten metal in rising head, even if starting induction heating power before casting, rising head will not also be felt It should heat.In fact, during castings production, when casting of molten metal, what the molten metal of high temperature ran into low temperature emits cup, by Its chilling action, can be formed about one layer of solid metallic shell emitting cup outer wall, directly reduce the feeding of rising head inner metal liquid Efficiency, while this solidification shell can also hinder flowing downward for molten metal and influence feeding effect.In addition, in casting of molten metal When, rising head inner metal liquid scatters and disappears also having amount of heat full of during, causes the temperature drop of rising head inner metal liquid very fast, especially It is heavy castings production, generally requires the longer duration of pouring.These will substantially reduce the feeding efficiency of rising head.
The content of the invention
Goal of the invention:The present invention provides a kind of casting rising head induction heating apparatus and casting rising head induction heating method, its Purpose is to overcome the shortcomings of that existing to emit vocal imitation skill feeding efficiency still relatively low.
Technical scheme:
One kind casting rising head induction heating apparatus, it is characterised in that:The device include riser buss, graphite cannula, steel bushing or its Annulus set, induction coil, thermocouple, water-cooled cable, moisture recorder and induction heating power case that his conductive material is made;Circle Ring set is arranged on riser buss periphery, and induction coil is arranged on annulus set periphery, and the two ends of induction coil pass through water-cooled cable and sense Heating power supply case is answered to connect, moisture recorder connection thermocouple, thermocouple is contacted with riser buss inwall.
Adiabatic insulating materials is placed between induction coil and annulus set.
The casting rising head induction heating method implemented using above-mentioned casting rising head induction heating apparatus, its feature is existed In:This method annulus set that placing graphite set, steel bushing or other conductive materials are made outside riser buss, outside annulus set again Place induction coil, the conductive material annulus set outside riser buss heated by induction coil, so to riser buss and Emit intraoral molten metal to be heated, reduce the temperature difference between rising head inner metal liquid and riser buss, reduce rising head inner metal liquid Scattering and disappearing for heat, reaches the effect for delaying rising head inner metal liquid to solidify.
Before pouring metal melt, annulus set is heated first with load coil, heat transfer is then utilized Principle, makes the rising head sleeving temperature rise of sky, rising head can be reduced when molten metal enters in rising head so after casting of molten metal Temperature difference between inner metal liquid and riser buss, reaches the effect for delaying rising head inner metal liquid to solidify, so as to improve casting pressing port Feeding efficiency and casting process outlet rate.
It can be covered and corresponding induction coil using the annulus of different size for various sizes of rising head, or only Using a larger induction coil, the physical dimension then covered by changing annulus emits to adapt to different sizes in actual production The demand of mouth.
Induction heating power case uses IGBT power supplys, and its type of cooling can use water cooling or air-cooled, or power supply box use can Silicon regulation is controlled, thyristor supply uses water-cooling pattern, changes the size of induction coil power by regulation power supply power output, So as to control annulus cover preheating temperature and cast after rising head inner metal liquid temperature.
Thermocouple is contacted with annulus set inwall, and the temperature signal measured by thermocouple is transferred to multi-point temp recorder, leads to The configured information crossed on observation moisture recorder carrys out regulation power supply power output, and then adjusts the temperature of annulus set.
Other conductive materials that annulus set is used is graphite, steel, iron, work in copper aluminium, for Steel Castings, select stone Ink material makees annulus set, is produced for low-smelting-point non-ferrous alloy material cast, selects other conductive materials, and annulus covers its material Fusing point it is higher than the molten metal temperature of cast.
This method covers heating to realize the pre-heat effect of riser buss using load coil to annulus, and is poured in molten metal Note is directly heated after entering riser buss using load coil to the molten metal in riser buss, so as to farthest make Molten metal plays feeding effect in rising head, it is to avoid casting produces shrink defects.
Adiabatic insulating materials is placed between induction coil and annulus set;Supply frequency uses intermediate frequency.
Advantageous effect:The present invention works out a kind of sensing heating rising head method, using Frequency Induction Heating, not only in cast It is preceding to rising head and to emit intraoral molten metal always with regard to being heated to riser buss, and in casting process and after being poured Heated, so that the heat for greatly reducing rising head inner metal liquid scatters and disappears, significantly improve the feeding efficiency of rising head.Institute of the present invention The casting rising head device of offer, including riser buss, graphite cannula, steel bushing or other conductive materials make annulus set, induction coil, Water-cooled cable, induction heating power case, thermocouple and moisture recorder, before pouring metal melt, first with sensing heating line Enclose the annulus set for making graphite cannula, steel bushing or other conductive materials to heat, then using heat transfer principle, make sky Rising head sleeving temperature is raised, and can be reduced rising head inner metal liquid when molten metal enters in rising head so after casting of molten metal and be emitted Temperature difference between muzzle, reach delay rising head inner metal liquid solidify effect so that improve casting pressing port feeding efficiency and Casting process outlet rate.
Casting rising head induction heating method of the present invention utilizes inductive heating principle, and heating process is advanced in cast OK, the chilling action that riser buss emits intraoral molten metal to entering is reduced, and after pouring metal melt enters in rising head, simultaneously Molten metal in riser buss and rising head is heated, so as to greatly prolong the setting time of rising head inner metal liquid.
Casting rising head induction heating method of the present invention, the circle of different size can be used for various sizes of rising head Ring set and corresponding induction coil., can also be only with order to improve the applicability of casting rising head induction heating apparatus One larger induction coil, then adapts to different size rising heads in actual production by changing the physical dimension of annulus set Demand.
Casting rising head induction heating method of the present invention, power supply box uses IGBT power supplys, and its type of cooling can use water It is cold or air-cooled.Power supply box also can use water-cooling pattern using controllable silicon regulation, thyristor supply.Pass through regulation power supply power output To change the size of induction coil power, so as to emit intraoral metal after controlling annulus set and the preheating temperature of riser buss and cast The temperature of liquid.
Casting rising head induction heating method of the present invention, supply frequency uses intermediate frequency.The electricity born due to molten metal Magnetic force is inversely proportional with the square root of supply frequency, therefore the electromagnetic stirring force of intermediate frequency power supply is more much smaller than power frequency supply.For In remove feeders for the impurity of molten metal and evening chemical composition, uniform temperature, intermediate frequency power supply effect is relatively good.Medium frequency induction Preferable function composite by electromagnetic stirring is heated, the floating of molten metal gas and field trash in rising head is also beneficial to, and is also beneficial to subtract The oxidation of light high temperature fluent metal, so as to improve the quality of rising head inner metal liquid, and then can reduce the stomata in casting And it is mingled with class defect.
Casting rising head induction heating method of the present invention, thermocouple is contacted with riser buss inwall, measured by thermocouple Temperature signal be transferred to multi-point temp recorder, by observing the configured information on moisture recorder come regulation power supply output work Rate, and then adjust the temperature of annulus set and riser buss.
Casting rising head induction heating method of the present invention, the material of annulus set can also use other electric conductivity materials Material, such as graphite, steel, iron, copper, aluminium and other materials.For Steel Castings, selection graphite material makees annulus set.For low Fusing point non-ferrous alloy material cast is produced, and other conductive materials may be selected.Annulus covers metal of the fusing point than cast of its material Liquid temperature degree is high.
Casting rising head induction heating apparatus of the present invention, is emitted using load coil to annulus set heating to realize The pre-heat effect of muzzle, and the molten metal in riser buss is entered using load coil after pouring metal melt enters riser buss Row is directly heated, so as to farthest make molten metal in rising head play feeding effect, it is to avoid casting produces shrink defects.
The specific of the present invention has the beneficial effect that:The present invention uses induction heating mode, by indirectly heat and directly add Heat is combined, i.e., carry out indirectly heat to riser buss in advance, reduces chilling action of the riser buss to entrance rising head inner metal liquid, with And direct sensing heating is carried out to entering rising head inner metal liquid in casting process, so that emitting the setting time of intraoral molten metal Greatly prolong, give full play to the feeding effect of rising head inner metal liquid, significantly improve the feeding efficiency of rising head inner metal liquid, contract significantly Subtract the Riser Dimensions of casting, reduce the generation for even avoiding cast-internal shrinkage porosity defect of contraction cavity, final realize improves the interior of casting Portion's quality and the process outlet rate for improving casting.Because the present invention uses sensing heating, equipment composition is simple and reliable, easily real Existing, heating surface (area) (HS is big, and firing rate is fast, and the efficiency of heating surface is high, is adaptable to the casting of all kinds of metal castings of different weight and size Production is made, the production for the medium-and-large-sized casting that is particularly suitable for use in.Compared with existing insulated feeder and exothermic riser, the present invention has such as Lower advantage:(1)Extend rising head setting time effect more notable than insulated feeder and exothermic riser;(2)It can realize to emitting intraoral gold Belong to the real-time control of liquid temperature degree;(3)Sensing heating rising head can be recycled, low with respect to production cost;(4)During use not Environmental pollution can be caused, more meets environmental requirement.Rising head is heated with existing resistance heating rising head, electric arc heated rising head and electroslag Compare, it is an advantage of the invention that:(1)The efficiency of heating surface is higher;(2)Effects of energy saving and emission reduction is more preferable;(3)In casting process, sensing adds Heat will not be polluted to emitting intraoral molten metal, so that it is purer to emit intraoral molten metal, it is possible to reduce the folder in casting The defect such as miscellaneous.
Brief description of the drawings:
Fig. 1 is sensing heating rising head schematic device.
Fig. 2 is the top view of sensing heating rising head part.
Fig. 3 is the shaft-like cast model used in embodiment.
Fig. 4 is the actual feeding effect contrast of rising head in embodiment, and wherein Fig. 4 a are a diameter ofΦThe common of 100mm emits Mouthful, Fig. 4 b are a diameter ofΦ60mm common rising head, Fig. 4 c are a diameter ofΦ60mm sensing heating rising head;
In above-mentioned accompanying drawing, each part is:1. emit intraoral molten metal;2. riser buss;3. annulus set;4. sense Answer coil;5. thermocouple;6. water-cooled cable;7. multi-point temp recorder;8. sand mold;9. induction heating power case;10. Sprue cup;11. yoke.
Embodiment:With reference to embodiment and experimental method, the present invention is described further:
Casting rising head induction heating apparatus of the invention a kind of, the device include riser buss 2, graphite cannula, steel bushing or other lead Annulus set 3, induction coil 4, thermocouple 5, water-cooled cable 6, moisture recorder 7 and induction heating power case 9 that electric material is made; Annulus set 3 is arranged on the periphery of riser buss 2, and induction coil 4 is arranged on the periphery of annulus set 3, and the two ends of induction coil 4 pass through water cooling electricity Cable 6 is connected with induction heating power case 9, and the connection thermocouple 5 of moisture recorder 7, thermocouple 5 is contacted with the inwall of riser buss 2.
The casting rising head induction heating method implemented using above-mentioned casting rising head induction heating apparatus, this method is being emitted The annulus set 3 that the outside placing graphite set of muzzle 2, steel bushing or other conductive materials are made, the line of induction is placed outside annulus set again Circle 4, is heated, and then to riser buss and emit intraoral gold by induction coil to the conductive material annulus set outside riser buss Category liquid 1 is heated, and reduces the temperature difference between rising head inner metal liquid and riser buss, reduces dissipating for rising head inner metal liquid heat Lose, reach the effect for delaying rising head inner metal liquid to solidify.
Before pouring metal melt, annulus set 3 is heated first with load coil 4, then passed using heat Principle is passed, makes the temperature of riser buss 2 rise of sky, can reduce when molten metal enters in rising head so after casting of molten metal and emit Temperature difference between intraoral molten metal and riser buss, reaches the effect for delaying rising head inner metal liquid to solidify, is emitted so as to improve casting The feeding efficiency and casting process outlet rate of mouth.
The application utilizes inductive heating principle, and heating process is carried out before cast, reduces riser buss and emits intraoral to entering Molten metal chilling action, and pouring metal melt enter rising head in after, while being carried out to molten metal in riser buss and rising head Heating, so as to greatly prolong the setting time of rising head inner metal liquid.
3 and corresponding induction coil 4 can be covered using the annulus of different size for various sizes of rising head, or Only with a larger induction coil, different chis in actual production are then adapted to by changing the physical dimension of annulus set 3 The demand of very little rising head.
Induction heating power case 9 uses IGBT power supplys, and its type of cooling can use water cooling or air-cooled, or power supply box 9 to use Controllable silicon is adjusted, and thyristor supply uses water-cooling pattern, changes the big of the power of induction coil 4 by regulation power supply power output It is small, thus control annulus cover 3 preheating temperature and cast after rising head inner metal liquid temperature.
Thermocouple 5 covers 3 inwalls with annulus and contacted, and the temperature signal measured by thermocouple is transferred to multi-point temp recorder 7, By observing the configured information on moisture recorder 7 come regulation power supply power output, and then adjust the temperature of annulus set 3.
Other conductive materials that annulus set 3 is used is graphite, steel, iron, work in copper aluminium, for Steel Castings, selection Graphite material makees annulus set, is produced for low-smelting-point non-ferrous alloy material cast, and other conductive materials may be selected.Annulus set 3 The fusing point of its material is higher than the molten metal temperature of cast.
Annulus set 3 can also use other conductive materials, such as graphite, steel, iron, copper, aluminium and other materials.
This method covers 3 heating to annulus to realize the pre-heat effect of riser buss 2 using load coil 4, and in metal Liquid cast is directly heated after entering riser buss using load coil 4 to the molten metal in riser buss 2, so that maximum journey Degree ground makes molten metal in rising head play feeding effect, it is to avoid casting produces shrink defects.
Adiabatic insulating materials is placed between induction coil 4 and annulus set 3;Supply frequency uses intermediate frequency.
Fig. 1 is sensing heating rising head device composition schematic diagram of the invention.Wherein induction coil internal diameter isΦ255mm, is adopted Made of section for square copper tube, the size of square-section is 23mm × 25mm, the logical cooling water in centre.Induction coil is by side Tee section fine copper pipe dish curl, outer surface winding insulation mica tape.Used on the outside of induction coil yoke.By induction coil structure Into sensing heater height be 160mm.Annulus set 3 is made up of graphite, and its internal diameter isΦ85mm, wall thickness is 20mm, height For 160mm.Riser buss material is ceramics, and its internal diameter isΦ60mm, wall thickness is 7mm, is highly 150mm.Power supply is using IGBT electricity Source, peak power 100kW, power adjustable.Water-cooled cable sectional area is 300mm2, the maximum electric current that carries is up to 2400A.In the line of induction Adiabatic insulating materials asbestos are placed between circle 4 and annulus set 3.Induction coil 4, annulus set 3 and the asbestos between them are laid On a ceramic wafer base.
Using simple plate-type cast product as embodiment model, its size is 400mm × 160mm × 40mm.It is used upper and lower Sandbox size is 700mm × 700mm × 200mm.Using unchoked running system.
Embodiment operating process is as follows:Moulding first.Using Ester cured automatic harding glass sand molding.Wherein mo(u)ld bottom half is one Individual plain sand lump, only play supporting role to mo(u)ld top half.Mo(u)ld top half moulding needs apperance.Apperance is except including sprue, cross gate, interior pour Outside road and plate-type cast product apperance, in addition to form placement sensing heating rising head space apperance.Apperance leave pattern draft with Just molding.Before moulding, painting brushes parting agent.First sprue, cross gate, ingate and plate-type cast product apperance are put in sandbox Get well, then back-up sand consolidation.When molding sand consolidation is to certain thickness, it is put into form sensing heating rising head space apperance, continues to fill out Sand consolidation, and strike off.Start molding after waiting for a period of time, first play sprue apperance and sensing heating rising head space with apperance Go out, then overturn sand mold, then cross gate, ingate and plate-type cast product apperance are risen out, then mo(u)ld top half is just made.Treat, After lower two sand molds hardening consolidation, then carry out that sensing heating rising head device is put into mo(u)ld top half after mould assembly, mould assembly and make in advance In the cylindrical space of formation.Then ceramic riser buss is directly placed into annulus set 3.If empty between riser buss and annulus set Gap is larger, then can insert dry sand.
Make after type, carried out the melting of alloy material.The material of plate-type cast product is larger using shrinkage factor in embodiment ZG35 materials.Melting is carried out using 50kg electromagnetic induction electric furnace.When alloy melting temp reaches 1650 DEG C of molten iron dischargings, Ran Houjin Row deoxidation, slag making, the operation such as skim, most enter in sprue cup after 1560 DEG C or so cast.
The application is while alloy melting is operated, in the preceding electricity for beginning to turn on sensing heating rising head device for 30 minutes of casting Source, induction coil be powered to annulus set 3 carry out sensing heatings, annulus sleeving temperature can be promoted within 20 minutes 1500 DEG C with On, and then indirect preheating is carried out to riser buss 2.Thermocouple 5 is contacted with the inwall of riser buss 2, the temperature signal measured by thermocouple Multi-point temp recorder 7 is transferred to, sensing heating rising head device is adjusted by observing the configured information on moisture recorder 7 Output power of power supply, and then adjust the preheating temperature of annulus set 3 and riser buss 2.The preheating temperature of riser buss is set to 1500 DEG C, when Reach and be incubated after temperature, wait casting.
The induction coil of sensing heating rising head device is kept not power off during pouring molten steel.With the progress of cast, molten metal Rising head can be gradually filled with, can now cause the useful power of sensing heating rising head device to become big, causes graphite annulus set temperature The quick rise of degree, in order to maintain the temperature that graphite annulus covers, will now reduce the power of sensing heating rising head device, make stone Black annulus set maintains 1500 DEG C or so, and method is still by being adjusted without the information shown on paper multi-point temp recorder 7 The power of sensing heating rising head device.
It is also required to keep the induction coil of sensing heating rising head device not power off in plate casting process of setting.Pass through meter Calculate the setting time of casting to determine the length of sensing heating time, sensing heating rising head device is cut off after casting solidifies completely Power supply, induction coil stop heating.In the present embodiment, the setting time of plate casting is about 5min, so pouring Finish after after about 8min be close sensing heating rising head device power supply.
After the power supply for cutting off load coil, still need to continue logical cooling water to protect sensing heating rising head device.Wait to cast Part is fully cooled to after room temperature, closes recirculated cooling water, sensing heating rising head device is removed from upper sand mold.Then shake out will Plate casting is taken out, and carries out Test Effect Analysis.
After the dead head of excision plate casting, plate casting is splitted from middle, with observation analysis plate casting Shrinkage porosity defect of contraction cavity production, result of the test is as illustrated in fig. 4 c.In order to verify the implementation result of sensing heating rising head, also carry out Contrast test.
Contrast test is respectively adopted using same plane casting as modelΦ100mm andΦ60mm earthenware rising head enters Row experiment, rising head wall thickness is 7mm, is highly 150mm.But do not place sensing heating rising head device outside rising head.It is tried Test result difference as shown in figures 4 a and 4b.Wherein,ΦThe experiment of 100mm earthenware rising heads is basic according to casting Technology Design Principle(Foundation《Cast handbook》)Come what is carried out, i.e., cast using common rising head, size is the flat of 400mm × 160mm × 40mm Plate casting needsϕ100mm × 150mm so big rising heads.
It can be seen that from Fig. 4 result of the test a diameter ofΦThe casting quality that 100mm rising head is obtained is intact, riser pad Any defect is also not present in portion;And it is a diameter ofΦThe cast-internal that the 60mm rising head for not placing induction heating apparatus is obtained is present There is open defect in shrinkage porosity defect of contraction cavity, especially rising head root;But diameter is stillΦ60mm rising head, adds placing sensing The Internal Quality of Cast obtained after thermal is intact, rising head root also no significant defect.
By contrast test find sensing heating emit intraoral more molten metals can feeding into casting, so as to get Casting quality is intact, so as to greatly reduce the size of rising head, improves the feeding efficiency of rising head, significantly improves the work of casting Skill outlet rate, sensing heating rising head achieves good result.

Claims (3)

1. one kind casting rising head induction heating method, it is characterised in that:This method is implemented using following device, and the device includes emitting Muzzle(2), the annulus set that graphite, steel or other conductive materials are made(3), induction coil(4), thermocouple(5), water-cooled cable (6), moisture recorder(7)With induction heating power case(9);Annulus set(3)It is arranged on riser buss(2)Periphery, induction coil(4) It is arranged on annulus set(3)Periphery, induction coil(4)Two ends pass through water-cooled cable(6)With induction heating power case(9)Connection, Moisture recorder(7)Connect thermocouple(5), thermocouple(5)With riser buss(2)Inwall is contacted;
This method process is as follows:
In riser buss(2)The annulus set that outside placing graphite, steel or other conductive materials are made(3), put again outside annulus set Put induction coil(4), the conductive material annulus set outside riser buss is heated by induction coil, so to riser buss and Emit intraoral molten metal(1)Heated, reduce the temperature difference between rising head inner metal liquid and riser buss, reduction emits intraoral metal Scattering and disappearing for liquid heat, reaches the effect for delaying rising head inner metal liquid to solidify;
Before pouring metal melt, first with load coil(4)To annulus set(3)Heated, then passed using heat Principle is passed, makes the riser buss of sky(2)Temperature is raised, and can be reduced when molten metal enters in rising head so after casting of molten metal Temperature difference between rising head inner metal liquid and riser buss, reaches the effect for delaying rising head inner metal liquid to solidify, so as to improve casting The feeding efficiency and casting process outlet rate of rising head;
The annulus set of different size can be used for various sizes of rising head(3)With corresponding induction coil(4), or Only with a larger induction coil, then by changing annulus set(3)Physical dimension it is different to adapt in actual production The demand of size rising head;
Induction heating power case(9)Using IGBT power supplys, its type of cooling water cooling or air-cooled, or power supply box(9)Using can Silicon regulation is controlled, thyristor supply uses water-cooling pattern, induction coil is changed by regulation power supply power output(4)Power it is big It is small, so as to control annulus set(3)Preheating temperature and cast after rising head inner metal liquid temperature;
Annulus set(3)The other conductive materials used is iron, copper or aluminium;
For Steel Castings, selection graphite material makees annulus set, is produced for low-smelting-point non-ferrous alloy material cast, selects it Its conductive material, annulus set(3)The fusing point of its material is higher than the molten metal temperature of cast.
2. casting rising head induction heating method according to claim 1, it is characterised in that:Thermocouple(5)With annulus set(3) Inwall is contacted, and the temperature signal measured by thermocouple is transferred to moisture recorder(7), by observing moisture recorder(7)On Configured information carrys out regulation power supply power output, and then adjusts annulus set(3)Temperature.
3. casting rising head induction heating method according to claim 1, it is characterised in that:In induction coil(4)And annulus Set(3)Between place adiabatic insulating materials;Supply frequency uses intermediate frequency.
CN201510186969.7A 2015-04-20 2015-04-20 Cast rising head induction heating apparatus and casting rising head induction heating method Active CN104826997B (en)

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