CN103084558B - Centrifugal casting feeding method for squirrel cage rotor and centrifugal casting die for implementing method - Google Patents
Centrifugal casting feeding method for squirrel cage rotor and centrifugal casting die for implementing method Download PDFInfo
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- CN103084558B CN103084558B CN201210487576.6A CN201210487576A CN103084558B CN 103084558 B CN103084558 B CN 103084558B CN 201210487576 A CN201210487576 A CN 201210487576A CN 103084558 B CN103084558 B CN 103084558B
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Abstract
The invention relates to a squirrel cage rotor. A squirrel cage rotor centrifugal casting die comprises an upper die and a lower die; the upper die comprises a rotor upper end annular cavity and a casting hole; the lower die is provided with a rotor lower end annular cavity; the lower end of the casting hole is lower than the top surface of the rotor upper end annular cavity; the rotor upper end annular cavity is wound outside the casting hole; a flow guiding wall is formed between the rotor upper end annular cavity and the casting hole; and materials are fed through the casting hole in a casting process. The invention provides a centrifugal casting feeding method for the squirrel cage rotor, and the squirrel cage rotor centrifugal casting die. By the method, a process that molten metal flows through a rotor iron core guide bar groove is accelerated; and by the method and the die, the problems that energy conversion efficiency of a motor is reduced due to low compactness of an aluminum cage, high air bubble entrainment possibility and broken guide bars in the conventional feeding method and the process that the squirrel cage rotor is cast by using the centrifugal casting die are solved.
Description
Technical field
The present invention relates to cage rotor, particularly relate to a kind of cage rotor spun casting feed process and realize the centrifugal casting mould of the method.
Background technology
Rotor is the rotating part of motor, and be made up of parts such as rotor core, rotor windings and rotating shafts, its effect obtains rotating torque under rotating excitation field effect.Rotor is divided into cage rotor and phase-wound rotor by the difference of its structure.Cage rotor is made up of rotor cage and rotor core.Rotor cage mainly contains two kinds and forms formation, a kind of for be arranged in rotor core sliver groove with copper bar, two ends rotor end ring welds and forms the rotor cage of shape as mouse cage, another kind of for adopting the mode of cast aluminium or cast copper to form rotor cage (aluminium cage is mainly used in middle-size and small-size rotor).
The method of casting rotor cage has spun casting and die casting.China Patent No. be 2010202801285, authorized announcement date be March 23 in 2011 day, be called the centrifugal casting die of the centrifugal casting disclosing a kind of aluminium cage for cage rotor in the patent document of " the making mould of centrifugal casting of squirrel cage motor rotor ".Centrifugal casting mould in this patent document mainly comprises upper die and lower die, counterdie is provided with rotor lower loop die cavity, patrix there are rotor top ring die cavity and tapping hole, the entrance point of tapping hole is positioned on the top of rotor top ring die cavity, if the entrance point roof of i.e. top ring die cavity being arranged tapping hole when fan blade die cavity or balancing weight die cavity is positioned on the diapire of fan blade die cavity or balancing weight die cavity, if do not arrange fan blade die cavity or balancing weight die cavity, the entrance point of tapping hole is positioned on the roof of rotor top ring die cavity.China Patent No. be 2011200705786, authorized announcement date be August 10 in 2011 day, be called the centrifugal casting die of the centrifugal casting disclosing a kind of aluminium cage for cage rotor in the patent document of " casting aluminum rotor making ".Centrifugal casting mould in this patent document mainly comprises upper die and lower die, and counterdie is provided with rotor lower loop die cavity, patrix has rotor top ring die cavity and tapping hole, and the entrance point position of tapping hole is identical with the set-up mode in first patent document.Chinese Patent Application No. be 2011104041952, date of publication be May 2 in 2012 day, be called in the patent document of " a kind of motor cage rotor centrifugal aluminum casting method " and disclose a kind of casting method for centrifugal of rotor cage and the centrifugal casting-mould of correspondence.The roof of the rotor top ring die cavity of this patent is provided with fan blade die cavity, and be namely that the roof of same rotor top ring die cavity is concordant be positioned at the intersection of blade profile chamber with rotor top ring die cavity for the lower end of plug hole.Existing tapping hole adopts for a long time always and makes tapping hole lower end be at least think that this kind of frame mode rotor top ring die cavity is maximum with the access portal area between tapping hole with the object of the concordant method for designing of top ring die cavity roof, is conducive to molten metal most and enters in rotor top ring die cavity.But the inventor of this patent to find with Experimental Comparison through studying for a long period of time, have the following disadvantages when carrying out charging by existing tapping hole: when molten metal flows to the wall portion of rotor top ring die cavity, irregular backflow can be produced, wherein there is the flow direction of towards tapping hole, this branching part can hinder molten metal continue enter and the air outflow in die cavity, molten metal is reduced by the flow velocity of rotor core sliver groove, make the rotor cage compactness produced poor, there is bubble and go out at sliver and easily produce phenomenon of rupture, and aluminium cage compactness is poor, the energy conversion efficiency of motor can be caused when carrying bubble and bar failure secretly to decline.
Summary of the invention
The invention provides a kind of molten metal that can accelerate through the cage rotor spun casting feed process of rotor core sliver groove and realize the cage rotor centrifugal casting mould of the method, exist when solving existing feed process and centrifugal casting mould casting cage rotor aluminium cage compactness poor, easily carry bubble and sliver secretly and produce and rupture and cause the problem that the energy conversion efficiency of motor declines.
Above technical problem is solved by following technical proposal: a kind of cage rotor spun casting feed process, by bottom lower than rotor top ring die cavity end face and by rotor top ring die cavity around tapping hole carry out charging.This feeding manner can form drainage wall between top ring die cavity and tapping hole, the molten metal injected from plug hole rise to top ring die cavity wall portion and the process of reflux under the effect of drainage wall, the flow direction of the molten metal of reflux is all changed into and is namely moved towards rotor core sliver concentrated flow down and produce downward pressure, play and accelerate molten metal and flow through the effect of rotor core sliver groove and the molten metal of reflux does not have the trend flowed out from tapping hole, thus the inflow of subsequent metal liquation can not be hindered, and the speed that molten metal flows into rotor core sliver groove is faster, according to momentum law F*T=M*V, when speed v is larger, then the impulse force F of molten metal to the air in die cavity is larger, thus be more conducive to air in die cavity and discharge and the compactness of foundry goods is better, air can be discharged in time, produces bubble and causes the phenomenon of rotor cage bar failure to reduce.During by the method charging, the remaining plush copper (hereinafter referred to as the remaining plush copper of tapping hole) that liquid stream wall energy enough rotor top ring places at the rotor cage blank of cast caused in the existence due to tapping hole are formed with rotor top ring between form remaining plush copper and remove guide channel, raising removes convenience during tapping hole remnants plush copper.
A kind of cage rotor centrifugal casting mould, comprise upper die and lower die, described patrix is provided with rotor top ring die cavity and tapping hole, described counterdie is provided with rotor lower loop die cavity, the bottom of described tapping hole is lower than the end face of rotor top ring die cavity, rotor top ring die cavity is looped around tapping hole outside, forms drainage wall between rotor top ring die cavity and tapping hole.
As preferably, the degree of depth of described rotor top ring die cavity is H, and the height of described drainage wall is L, 0.25H≤L≤0.75H.One side can make the bottom of drainage wall and the bottom of tapping hole with having enough gaps for molten metal and air flowing between rotor core, can effectively making the direction of the liquid stream be reflected back through rotor top ring die cavity end face change into towards rotor core sliver groove on the other hand, to improve the compactness of watering the rotor cage cast out and the probability reducing generation bubble and mouse cage bar failure phenomenon further.
As preferably, the thickness of described drainage wall is more than or equal to 1 millimeter.The flexural deformation that drainage wall causes by intensity during thermal softening declines in casting cycle can be avoided.The flexural deformation of drainage wall can cause on the one hand the inner peripheral surface size of rotor top ring undesirable, need secondary operations to make up; Can cause patrix with rotor top ring clasp joint together on the other hand, cause rotor to be difficult to take off from patrix.
As preferably, described tapping hole is cylindrical or big top and small bottom taper shape, described tapping hole and described rotor top ring die cavity coaxial.In casting cycle, rotor core is for axle carries out rotating with the axis of rotor top ring die cavity.This design is due in centrifugally cast process, the linear velocity of the same radius of rotor cage is identical, the identical then centrifugal force of linear velocity is identical, therefore the uniformity of the compactness of the same radius of rotor cage is good, make the balance of the mouse cage watering the rotor cast out good, be convenient to carry out calibration balance to rotor.
As preferably; described cage rotor centrifugal casting mould also comprises for the core of enclosed rotor iron core towards the rotor core axis hole of patrix one end; described core comprises stick harness and headkerchief, and described headkerchief is circular, and the diameter of described headkerchief is identical with the interior diameter of rotor top ring.After design core, the remaining plush copper of tapping hole is connected to the middle part of the inner peripheral surface of rotor top ring and the thinner thickness of junction, only needs less power remaining for tapping hole plush copper can be separated with rotor top ring and can meet surface smoothness requirements without the need to carrying out processing to the inner peripheral surface of rotor top ring towards top, the direction core of iron core far away.
As preferably, the roof of rotor top ring die cavity is provided with the upper air-vent that some aperture areas are less than 3 square millimeters.Be conducive to the discharge of the air in rotor top ring die cavity, reduce the possibility producing bubble further, especially when molten metal casting is to when being filled to higher than tapping hole bottom.There are thought mistaken ideas in the technical staff of centrifugal casting rotor always, think perforate in the die cavity of rotor lower surface, molten metal can flow out and causes discharge quantity inconvenience to control and form the remaining plush copper of steam vent in hole from hole, the formation of the remaining plush copper of steam vent needs to carry out excision process, generating process can be caused to increase, but present inventor finds through experiment many times, due to mold exterior rapid heat dissipation and away from molten metal, external temperature can be starkly lower than internal temperature, when the aperture area of steam vent is below 3 square millimeters, the degree of depth of molten metal access aperture is no more than 0.1 millimeter and namely can produces solidification and stop flowing, now the amount of the molten metal of ostium can not affect the control of discharge quantity, blanking is still carried out according to existing mode, and the remaining projection of the steam vent of this length can meet the requirement of rotor cage surface smoothness, the remaining plush copper operation of steam vent is removed without the need to increasing.
As preferably, the roof of described rotor top ring die cavity is provided with some upper installation through holes, and the lower end of upper installation through hole is provided with exhaust mesh sheet, and the mesh in described upper exhaust mesh sheet forms described upper air-vent.Convenience during processing upper air-vent can be improved.If directly set out upper air-vent on patrix, then add and can extremely waste time and energy man-hour.And by offering on patrix, through hole (easily realize when offering macropore and offer little and dark Kong Zehui very difficult) is installed, and in upper installation through hole, install exhaust mesh sheet and form upper air-vent, then the convenience adding man-hour can significantly improve.
As preferably, described upper installation through hole is the stepped hole that lower end perforated area little upper end perforated area is large, the upper end of described upper exhaust mesh sheet is provided with exhaust mesh sheet flanging, be removably connected with exhaust mesh sheet pressing lever in the upper end of described upper installation through hole, described upper exhaust mesh sheet flanging is installed on the step of through hole on described by the pressure holding of described upper exhaust mesh sheet pressing lever.Facilitate when installing/dismounting being vented mesh sheet, be convenient to take out when upper exhaust mesh sheet produces blocking carry out clearing up or changing, improve convenience when safeguarding.
As preferably, described patrix is also provided with some upper bleed-off passages, and the port of export of described upper air-vent is docking together with the entrance point of described upper bleed-off passage, and the port of export of described upper bleed-off passage extends towards the direction away from rotor top ring mold cavity axis.In use, by centrifugal action during mold rotation, the air in upper exhaust passage can promptly be discharged, and the air that can improve in rotor top ring die cavity discharges effect.
As preferably, the diapire of rotor lower loop die cavity is provided with the lower steam vent that some aperture areas are less than 3 square millimeters.In casting cycle, aluminium liquid pours into from the plug hole be positioned at patrix, flow through rotor top ring die cavity on patrix and rotor core slotted eye successively and arrive in the rotor lower loop die cavity on counterdie, thus fill full rotor lower loop die cavity, rotor core slotted eye and rotor top ring die cavity successively, aluminium liquid is fixed on the rotor cage on rotor core in above-mentioned site curing rear formation thus obtains cage rotor.When aluminium liquid flows through iron core slotted eye, because the narrower meeting in iron core slotted eye place produces bottleneck effect at this place, now due to the setting of lower steam vent, air in rotor lower loop die cavity can be discharged from lower steam vent, thus can not produce air-flow row and do not go out and cause having in aluminium cage bubble and produce fault-layer-phenomenon on sliver.
As preferably, the upper surface of described lower exhaust mesh sheet is concordant with the bottom surface of rotor lower loop die cavity.The planarization of the end face of the rotor lower loop produced is good.
As preferably, described counterdie is also provided with some lower pumping passages, and the port of export of described lower steam vent is docking together with the entrance point of described lower pumping passage, and the port of export of described lower pumping passage extends towards the direction away from counterdie axis.In use, by centrifugal action during mold rotation, the air in lower exhaust passage can promptly be discharged, and the air that can improve in rotor lower loop die cavity discharges effect.
As preferably, the inlet end of described lower steam vent is provided with lower steam vent solidification section, described lower steam vent solidification section is the taper that cylindricality or hypomere aperture area little upper end open area are large, and described lower steam vent solidifies the axis being parallel of center line with rotor lower loop die cavity of section.This design, the remaining plush copper of the lower steam vent making to be formed in lower steam vent is with the axis being parallel of mould, only need when the rotor cast is taken out from mould to overcome the remaining plush copper of lower steam vent with the adhesive force between lower steam vent, the remaining plush copper of lower steam vent can not clasp joint in lower steam vent, laborsaving when making to take off rotor.
As preferably, the lower surface of described upper exhaust mesh sheet is with the either flush of rotor top ring die cavity.The planarization of the end face of the rotor top ring produced is good.
As preferably, the inlet end of described upper air-vent is provided with upper air-vent solidification section, described upper air-vent solidification section is the taper that cylindricality or hypomere aperture area large upper end open area are little, and described upper air-vent solidifies the axis being parallel of center line with rotor top ring die cavity of section.This design, make the remaining plush copper of the upper air-vent that formed in upper exhaust hole with the axis being parallel of mould, only need when the rotor cast is taken out from mould to overcome the remaining plush copper of upper air-vent with the adhesive force between upper air-vent, the remaining plush copper of upper air-vent can not clasp joint in upper air-vent, laborsaving when making to take off rotor.
The present invention has following advantage, by make the bottom of tapping hole lower than the end face of rotor top ring die cavity and by rotor top ring die cavity around and form drainage wall, make the part at the molten metal upper reaches entered in rotor top ring die cavity can change dirty motion into, thus make the compactness of rotor cage good, be not easy produce bubble and produce bar failure phenomenon, when the rotor made by the method is applied to motor, the efficiency of motor can be improved; The design of drainage wall end can also improve convenience when removing tapping hole remnants plush copper; It is that the upper air-vent of less than 3 square millimeters is exhausted that rotor top ring die cavity roof arranges aperture area, can reduce the possibility producing bubble further; It is that the lower steam vent of less than 3 square millimeters is exhausted that the diapire of rotor lower loop die cavity arranges aperture area, makes can not produce bottleneck effect in rotor core sliver groove internal cause and cause rotor cage sliver produce tomography cracking phenomena and in rotor lower loop, produce bubble phenomenon in casting cycle; Lower steam vent be arranged so that air-flow is little with the counter flow action of liquid stream, the compactness of watering the rotor cage cast out improves further and can not cause the increase of rotor machining operation; Lower steam vent is arranged on the diapire of rotor lower loop, upper air-vent is arranged on rotor top ring roof, exhaust thoroughly, convenient and strength-saving when taking out the rotor of cast, can not produce and damage the phenomenon on end ring surface and the remaining projection of steam vent to break at steam vent interior and produce the phenomenon that steam vent blocks.
Accompanying drawing explanation
Fig. 1 is the structural representation of the cage rotor centrifugal casting mould of the embodiment of the present invention one.
Fig. 2 is the A place enlarged diagram of Fig. 1.
Fig. 3 is the perspective view after the amplification of lower exhaust mesh sheet.
Fig. 4 is the enlarged diagram at the B place of Fig. 1.
Fig. 5 is the schematic diagram be fixed to by rotor core in embodiment one casting cycle when cage rotor centrifugal casting mould is poured into a mould.
Fig. 6 is the schematic diagram of embodiment one when completing casting.
Fig. 7 is the structural representation watering the cage rotor blank cast out in embodiment one.
Fig. 8 is the structural representation of the counterdie of the cage rotor centrifugal casting mould of the embodiment of the present invention two.
Fig. 9 is the structural representation of the patrix of the cage rotor centrifugal casting mould of the embodiment of the present invention two.
Figure 10 is the structural representation of the cage rotor centrifugal casting mould of the embodiment of the present invention three.
Figure 11 is schematic diagram when being fixed on cage rotor centrifugal casting mould by rotor core in embodiment three casting cycle.
Figure 12 is the schematic diagram of embodiment three when completing casting.
In figure: counterdie 1, rotor lower loop die cavity 11, lower installation through hole 12, positioning core axle 13, lower pumping passage 14, the port of export 141 of lower pumping passage, the entrance point 142 of lower pumping passage, patrix 2, top ring die cavity 21, tapping hole 22, upper installation through hole 23, upper bleed-off passage 24, the port of export 241 of upper bleed-off passage, the entrance point 242 of upper bleed-off passage, drainage wall 25, upper balance weight die cavity 26, core 3, lower exhaust mesh sheet 4, lower exhaust mesh sheet flanging 41, steam vent 42, lower steam vent solidification section 421, lower air chamber 43, lower air chamber gas outlet 431, lower exhaust mesh sheet pressing lever 5, upper exhaust mesh sheet 6, upper exhaust mesh sheet flanging 61, upper air-vent 62, upper air-vent solidification section 621, upper gas chamber 63, upper gas chamber gas outlet 631, upper exhaust mesh sheet pressing lever 7, rotor core 8, rotor core axis hole 81, rotor core sliver groove 82, rotor cage 9, rotor cage die cavity 91, rotor top ring 92, rotor bar 93, rotor lower loop 94, the remaining plush copper 95 of tapping hole, lower balance weight 96, upper balance weight 97, remaining plush copper removes guide channel 98, aluminium liquid 100.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated.
Embodiment one, see Fig. 1, a kind of cage rotor centrifugal casting mould, comprises counterdie 1, patrix 2 and core 3.
Counterdie 1 is provided with rotor lower loop die cavity 11.The diapire of rotor lower loop die cavity 11 is provided with three lower balance weight die cavities (lower balance weight die cavity is invisible in the drawings).Counterdie 1 installs through hole 12 under being provided with 7.Lower installation through hole 12 distributes along the circumference of rotor lower loop die cavity 11.Three of installing under 7 in through hole 12 are positioned on the diapire of three lower balance weight die cavities correspondingly, and other four of installing under 7 in through hole 12 are positioned on the diapire of rotor lower loop die cavity 11.Lower exhaust mesh sheet 4 and lower exhaust mesh sheet pressing lever 5 is provided with in lower installation through hole 12.Lower exhaust mesh sheet pressing lever 5 is tubular structure.Counterdie 1 is provided with positioning core axle 13.
Patrix 2 is provided with rotor top ring die cavity 21 and tapping hole 22.The diapire of rotor top ring die cavity 21 is provided with three upper balance weight die cavities 26 along the distribution of rotor top ring die cavity circumference.Patrix 2 is provided with 7 upper installation through holes 23.Upper installation through hole 23 is uniformly distributed along the circumference of rotor top ring die cavity 21.7 upper three of installing in through hole 23 are positioned on the roof of three upper balance weight die cavities 26 correspondingly, and 7 upper other four of installing in through hole 23 are positioned at (the upper installation through hole be positioned on rotor top ring die cavity roof is invisible in the drawings) on the roof of rotor top ring die cavity 21.Exhaust mesh sheet 6 and upper exhaust mesh sheet pressing lever 7 is provided with in upper installation through hole 23.Upper exhaust mesh sheet pressing lever 7 is tubular structure.The bottom of tapping hole 22 is lower than the end face of rotor top ring die cavity 21, and it is outside that rotor top ring die cavity 21 is looped around tapping hole 22, forms drainage wall 25 between rotor top ring die cavity and tapping hole.The height L of drainage wall equals 1/2nd of the depth H of rotor top ring die cavity.The inner peripheral surface of drainage wall 25 and outer peripheral face are all the conical surface.In drainage wall 25 thinnest part and figure, the thickness of lower end is 1.5 millimeters.Tapping hole 22 is big top and small bottom taper shape, tapping hole 22 and rotor top ring die cavity 21 coaxial.
See Fig. 2, lower installation through hole 12 is the stepped hole that upper end perforated area little lower end perforated area is large.The lower end of lower exhaust mesh sheet 4 is provided with lower exhaust mesh sheet flanging 41.Lower exhaust mesh sheet flanging 41 by the pressure holding of lower exhaust mesh sheet pressing lever 5 on the step of lower installation through hole 12.Lower exhaust mesh sheet pressing lever 5 is fixed in lower installation through hole 12 by the mode be embedded.Mesh in lower exhaust mesh sheet 4 forms lower steam vent 42.Lower steam vent 42 for aperture area be the cylindrical hole of 0.035 square millimeter.The center line of lower steam vent 42 is with the axis being parallel of rotor lower loop die cavity 11.The inlet end of lower steam vent 42 and upper end form the lower steam vent solidification section 421 of cylindricality.The upper surface of lower exhaust mesh sheet 4 is concordant with the bottom surface of rotor lower loop die cavity 11.
See Fig. 3, lower exhaust mesh sheet 4 is cylindrical.Lower steam vent 42 is cylindrical hole.
See Fig. 4, upper installation through hole 23 is the stepped hole that lower end perforated area little upper end perforated area is large.The upper end of upper exhaust mesh sheet 6 is provided with exhaust mesh sheet flanging 61.Upper exhaust mesh sheet flanging 61 by the pressure holding of upper exhaust mesh sheet pressing lever 7 on the step of upper installation through hole 23.Upper exhaust mesh sheet pressing lever 7 is fixed in upper installation through hole 23 by the mode be embedded.Mesh in upper exhaust mesh sheet 6 forms upper air-vent 62.The aperture area of upper air-vent 62 is the cylindrical hole of 0.035 square millimeter.The center line of upper air-vent 62 is with the axis being parallel of rotor top ring die cavity 21.The inlet end of upper air-vent 62 and lower end form the upper air-vent solidification section 621 of cylindricality.The lower surface of upper exhaust mesh sheet 6 is with the either flush of rotor top ring die cavity 21.
During use, see Fig. 5, rotor core 8 being shelved on counterdie 1 and location stem stem 13 is inserted in the lower end of rotor core axis hole 81, core 3 is contained in the upper end of rotor core axis hole 81, counterdie 1 is driven to rise by centrifuge, patrix 2 coordinates counterdie 1 to clamp rotor core 8, makes rotor top ring die cavity 21, rotor core sliver groove 82 and rotor lower loop die cavity 11 form rotor cage die cavity 91.
Aluminium liquid 100 is poured in rotor cage die cavity 91 through tapping hole 22.Aluminium liquid 100 floods first rapidly the position of plug hole high-pressure induct wall bottom, aluminium liquid 100 enters top ring die cavity along the radial direction of top ring die cavity 21 under the influence of centrifugal force, the part entered in the aluminium liquid of top ring die cavity 21 arrives in rotor lower loop die cavity 11 through rotor core sliver groove 82, another part upwards fills the part of corresponding drainage wall in full top ring die cavity 21, the aluminium liquid being filled in this part upwardly top ring die cavity diapire and radial compression drainage wall 25 time be subject to the reaction force of drainage wall 25 and top ring die cavity diapire, counteractive result is change into flowing to rotor core sliver groove 82 and playing under the drainage of drainage wall 25 promoting that aluminium liquid accelerates to flow through the effect of rotor core sliver groove 82, do not flow to tapping hole and interfere pouring into of aluminium liquid.Aluminium liquid 100 fills full rotor lower loop die cavity 11, rotor core sliver groove 82 and rotor top ring die cavity 21 successively, and aluminium liquid is solidified to form and is fixed on rotor cage 9(on rotor core 8 see Fig. 6 in rotor cage die cavity 91).
See Fig. 5 and composition graphs 2 and Fig. 4, when aluminium liquid flows through rotor core sliver groove 82, bottleneck effect can be produced because this place is narrower, the air being positioned at rotor lower loop die cavity 11 is difficult to from rotor core sliver groove 82 upper reaches, air pressure in lower loop die cavity 11 is on the rise, the result risen makes the air in rotor lower loop die cavity 11 discharge in lower steam vent 42, a gas part in same rotor top ring die cavity 21 is discharged in tapping hole 22, another part is discharged in upper air-vent 62, and the degree of depth that aluminium liquid enters upper air-vent solidification section 621 and the degree of depth that enters in lower steam vent solidification section 421 are solidifying less than when 0.03 millimeter.Thus air-flow row can not be produced do not go out and cause having in rotor cage 9 bubble and rotor cage 9 to be positioned at the part of rotor core sliver groove 82 and rotor cage sliver place produces fault-layer-phenomenon, and convenient when taking off rotor.
See Fig. 7, in the rotor blank of having cast, the rotor bar 93 that rotor cage 9 comprises rotor top ring 92, rotor lower loop 94 and linked together with rotor lower loop by rotor top ring.Rotor lower loop 94 there is the lower balance weight 96 watering and cast out.Rotor top ring 92 there are the upper balance weight 97 and the remaining plush copper 95 of tapping hole that water and cast out.Core 3 is wrapped in cage rotor.Form remaining plush copper between the remaining plush copper 95 of tapping hole and rotor top ring 92 and remove guide channel 98.By the axially outside top core 3 along rotor core axis hole 81, remove the guiding of guide channel 98 in remaining plush copper under, the remaining plush copper 95 of tapping hole can be separated with rotor top ring 92 easily and make rotor top ring 92 endoporus self-assembling formation and without the need to reprocessing.
Embodiment two, the difference with embodiment one is: see Fig. 8, and counterdie 1 is provided with 7 lower pumping passages 14.The entrance point 142 of each lower pumping passage respectively same lower installation through hole 12 is communicated with.The port of export 141 of lower pumping passage is positioned in the radial side of counterdie 1.Lower steam vent solidification section 421 is the taper that hypomere aperture area little upper end open area is large.The aperture area of the upper port of lower steam vent solidification section 421 is 0.3 square millimeter.Lower exhaust mesh sheet 4 is provided with lower air chamber 43.The outlet side being positioned at all lower steam vents 42 in same lower exhaust mesh sheet is communicated with lower air chamber 43.Lower air chamber 43 is provided with lower air chamber gas outlet 431.Lower air chamber gas outlet 431 is docking together with the entrance point 142 of lower pumping passage.Lower exhaust mesh sheet pressing lever 5 is male-pipe (screw thread does not draw in the drawings).Internal thread (screw thread does not draw in the drawings) is provided with in lower installation through hole 12.Lower exhaust mesh sheet pressing lever 5 is threaded in lower installation through hole 12.
The air entering lower steam vent 42 during use is discharged through lower pumping passage 14.
See Fig. 9, patrix 2 is provided with 7 upper bleed-off passages 24.On each the entrance point 242 of bleed-off passage respectively same upper installation through hole 23 be communicated with.The port of export 241 of upper bleed-off passage is positioned in the radial side of patrix 2.Upper air-vent solidification section 621 is the taper that hypomere aperture area large upper end open area is little.The aperture area of the lower port of upper air-vent solidification section 621 is 0.3 square millimeter.Upper exhaust mesh sheet 6 is provided with upper gas chamber 63.The outlet side being positioned at all upper air-vents 62 in same upper exhaust mesh sheet is communicated with upper gas chamber 63.Upper gas chamber 63 is provided with upper gas chamber gas outlet 631.The entrance point 242 of the same bleed-off passage in upper gas chamber gas outlet 631 is docking together.Upper exhaust mesh sheet pressing lever 7 is male-pipe (screw thread does not draw in the drawings).Internal thread (screw thread does not draw in the drawings) is provided with in upper installation through hole 23.Upper exhaust mesh sheet pressing lever 7 is threaded in installation through hole 23.The height L of drainage wall equals 1/4th of the depth H of rotor top ring die cavity.
The air entering upper air-vent 62 during use is discharged through upper bleed-off passage 14.
Adopting multiple steam vent to share a bleed-off passage in the present embodiment is convenience in order to improve during making, and the corresponding exhaust passage of an obvious steam vent to realize same goal of the invention.
Embodiment three, the difference with embodiment one is: see Figure 10, and the height L of drainage wall equals 3/4ths of the depth H of rotor top ring die cavity.Tapping hole 22 is cylindrical.The thickness of drainage wall 25 is 1 millimeter.Core is not set, but the height of positioning core axle 13 is designed to the length higher than rotor core axis hole (see Figure 11).
See Figure 11, during use, positioning core axle 13 to be located in rotor core axis hole 81 and to stretch out from the upper end of rotor core axis hole 81.Counterdie 1 is made to coordinate patrix 2 to be clamped by rotor core 8 by centrifuge.Aluminium liquid pours into from tapping hole 22.
See Figure 12, during this design, need remaining for tapping hole plush copper 95 to be separated from rotor cage 9 by the mode of bore hole, remaining plush copper is removed guide channel 98 and is cut for needing when feed provides benchmark and reduces bore hole the thickness worn.
Claims (4)
1. a cage rotor centrifugal casting mould, comprise upper die and lower die, described patrix is provided with rotor top ring die cavity and tapping hole, described counterdie is provided with rotor lower loop die cavity, it is characterized in that, also comprise for the core of enclosed rotor iron core towards the rotor core axis hole of patrix one end, the bottom of described tapping hole is lower than the end face of rotor top ring die cavity, rotor top ring die cavity is looped around tapping hole outside, drainage wall is formed between rotor top ring die cavity and tapping hole, the degree of depth of described rotor top ring die cavity is H, the height of described drainage wall is L, 0.25H≤L≤0.75H, described core comprises stick harness and headkerchief, described headkerchief is circular, the diameter of described headkerchief is identical with the interior diameter of rotor top ring, the roof of rotor top ring die cavity is provided with the upper air-vent that some aperture areas are less than 3 square millimeters, the roof of described rotor top ring die cavity is provided with some upper installation through holes, the lower end of upper installation through hole is provided with exhaust mesh sheet, mesh in described upper exhaust mesh sheet forms described upper air-vent, described upper installation through hole is the stepped hole that lower end perforated area little upper end perforated area is large, the upper end of described upper exhaust mesh sheet is provided with exhaust mesh sheet flanging, exhaust mesh sheet pressing lever is removably connected with in the upper end of described upper installation through hole, described upper exhaust mesh sheet flanging is installed on the step of through hole on described by the pressure holding of described upper exhaust mesh sheet pressing lever.
2. cage rotor centrifugal casting mould according to claim 1, is characterized in that, the thickness of described drainage wall is more than or equal to 1 millimeter.
3. cage rotor centrifugal casting mould according to claim 1 and 2, is characterized in that, described tapping hole is cylindrical or big top and small bottom taper shape, described tapping hole and described rotor top ring die cavity coaxial.
4. cage rotor centrifugal casting mould according to claim 1 and 2; it is characterized in that; described patrix is also provided with some upper bleed-off passages; the port of export of described upper air-vent is docking together with the entrance point of described upper bleed-off passage, and the port of export of described upper bleed-off passage extends towards the direction away from rotor top ring mold cavity axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210487576.6A CN103084558B (en) | 2012-11-27 | 2012-11-27 | Centrifugal casting feeding method for squirrel cage rotor and centrifugal casting die for implementing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210487576.6A CN103084558B (en) | 2012-11-27 | 2012-11-27 | Centrifugal casting feeding method for squirrel cage rotor and centrifugal casting die for implementing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103084558A CN103084558A (en) | 2013-05-08 |
| CN103084558B true CN103084558B (en) | 2015-06-03 |
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| JPS6138768A (en) * | 1984-07-31 | 1986-02-24 | Toyota Central Res & Dev Lab Inc | Metallic die for die casting |
| JPH0549220A (en) * | 1991-08-12 | 1993-02-26 | Mitsubishi Electric Corp | Casting device for cage rotor |
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| CN201422061Y (en) * | 2009-04-20 | 2010-03-10 | 无锡市中达电机有限公司 | Motor rotor centrifugal cast aluminum mould |
| CN202207785U (en) * | 2011-07-18 | 2012-05-02 | 浙江华辰电器股份有限公司 | Centrifuge casting apparatus of motor rotor squirrel cage |
| CN203076557U (en) * | 2012-11-27 | 2013-07-24 | 杭州富生电器股份有限公司 | Squirrel-cage type rotor centrifugal casting mould with feeding structure |
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Address after: 311401 Hangzhou, Zhejiang, Dongzhou street, Dongzhou industrial function zone, Road No. nine, No. 1, No. Patentee after: Hangzhou Fusheng Electrical Appliance Co., Ltd. Address before: 311401 Hangzhou, Zhejiang, Dongzhou street, Dongzhou industrial function zone, Road No. nine, No. 1, No. Patentee before: Hangzhou Fusheng Electrical Co.,Ltd. |
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Application publication date: 20130508 Assignee: Sichuan Fu Sheng Electric Co., Ltd. Assignor: Hangzhou Fusheng Electrical Appliance Co., Ltd. Contract record no.: 2018330000099 Denomination of invention: Centrifugal casting feeding method for squirrel cage rotor and centrifugal casting die for implementing method Granted publication date: 20150603 License type: Common License Record date: 20180813 |