CN1122065A - Method for low pressure casti squirrel-cage rotator - Google Patents
Method for low pressure casti squirrel-cage rotator Download PDFInfo
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- CN1122065A CN1122065A CN 94117936 CN94117936A CN1122065A CN 1122065 A CN1122065 A CN 1122065A CN 94117936 CN94117936 CN 94117936 CN 94117936 A CN94117936 A CN 94117936A CN 1122065 A CN1122065 A CN 1122065A
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- counterdie
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Abstract
The low-pressure casting method for squirrel-cage rotor features that top mould is preheated by the first preheater, the middle and bottom moulds are preheated by the second preheater to a temp higher than that of top mould, the top, middle and bottom moulds are reheated by the third preheater before or after they are assembled together.
Description
The present invention relates to aluminium alloy that a kind of use contains fine aluminium or silicon etc. and cast the low-pressure casting method of cage rotor.
Fig. 3 is the fan-shaped skiagraph of general cage rotor.The a plurality of flute profile conductors 77 that have on laminated iron core 7 neighborings of axis hole 76 form short circuit by upper and lower short-circuited conducting sleeve 78,75, are formed with the wing 79 on the last short-circuited conducting sleeve 78, and the bottom of following short-circuited conducting sleeve 75 is formed with down gate 74.
Because the rotor diameter size is little, therefore, the formation method of this cage rotor conductor has nothing in common with each other, and the method for welding of casting die, low pressure casting method (low pressure metal mould casting method) and soldering short circuit on copper or copper alloy conductor rod is generally arranged.For small-sized cage rotor, use fine aluminium (accounting for 99.7%) proper, because its conductance is better, rotor electrical characteristics, size of current and the mechanical strength of utilizing this method to produce are all very abundant, can produce in a large number, therefore, equipment investment is easy.When adopting casting die, the external diameter value of rotor is exceeded with about φ 200～300.For rotor diameter is the turning motor of φ 300～500 scopes, adopts many kinds produced in small quantities, and conductor uses the more suitable with low pressure casting method of fine aluminium, this with compare for onesize rotor employing casting die, the material zero defect, functional.
Fig. 2 is the skiagraph that prior art adopts low-pressure casting method.Among the figure, have in the protection stove 2 of air scoop 2a and lid 2b and can hold additional metallic solution is arranged, the bottom of material pipe 3 is immersed in wherein.The upper end of material pipe 3 thickly is bonded together with upper and lower separable mode and cup 4 liquid that have down gate 4a.Having down gate 4a on the counterdie 5, the die cavity 5a that short-circuited conducting sleeve was used under the mould cast gate 5b that can be communicated with reached.In intermediate die 6, for the outside at the central shaft 6a that inserts forms the groove that conductor is used, the periphery that centers on laminated iron core 7 is provided with the die cavity 7a that this groove is used.In patrix 8, have the die cavity 8a that is provided with for last short-circuited conducting sleeve and reach the die cavity 8b that is provided with for the wing.The place, composition surface of cup portion 4, counterdie 5, intermediate die 6 and patrix 8 is separable.
The central shaft 6a that inserts laminated iron core 7 is contained in counterdie 5, intermediate die 6 and the patrix 8, whole metal pattern is with suitable method preheating, after making it and cup 4 liquid thickly engaging, is gas pressurized such as 0.05～0.1 atmospheric air from air scoop 2a to gas pressure, metallic solution 1 is risen from material pipe 3, pass through cup portion 4 again, go up die cavity 5a, the die cavity 7a of groove, the die cavity 8a that goes up short-circuited conducting sleeve and the die cavity 8b of the wing that cast gate 4a, mould cast gate 5b rise to down short-circuited conducting sleeve successively, be full of whole die cavitys like this.After metallic solution in the die cavity solidifies,, counterdie 5 need be separated with cup portion 4 for the conductor metal of going up between down gate 4a and mould cast gate 5b will being separated.Then, with counterdie 5, intermediate die 6 and patrix 8 separately, therefrom take out the cage rotor that has flute profile conductor, short-circuited conducting sleeve and the wing.Have metallic solution in the cup portion 4 of enough volumes when also not solidifying, counterdie 5 just separates with it.
Utilize the short-circuited conducting sleeve 78,75 and the flute profile conductor 77 of the formed cage rotor of aforementioned low-pressure casting method often to have following shortcoming: go up (1) has the shrinkage cavity fault to produce on the short-circuited conducting sleeve 78.(2) (microcrack etc.) can rupture on the surface of going up short-circuited conducting sleeve 78.(3) fracture phenomena of flute profile conductor takes place in shrinkage cavity fault on the flute profile conductor 77 sometimes.And, above-mentioned defective (1), (2), (3), if big more, the laminated iron core 7 of cage rotor body basal area (volume) big more, short-circuited conducting sleeve 78,75, easy more generation when long conductor groove 77 is thin more, fatigue strength also can reduce.When the flute profile stub of such cage rotor, copper and copper alloy is adopted the short-circuited conducting sleeve method for welding, must must change design, thereby make the price costliness that becomes.
By the analysis to above-mentioned shortcoming, because metallic solution is filled in the below when utilizing low-pressure casting method, the conductor in the metal pattern solidifies from the top to the below successively, so need sufficient directional solidification.Concerning whole metal pattern, clearly, because stria shape conductor is between the centre, its upper and lower wall thickness part (short-circuited conducting sleeve part) has definite shape, and simultaneously, laminated iron core remains on intermediate die, and the thermal capacity that needs is big, therefore just can not reach sufficient preheat temperature.If can not get this directional solidification, just do not reach the effect of prosperous mouthful of foundry goods basically, above-mentioned defective will take place like this.
The objective of the invention is to eliminate the defective of aforementioned conductor foundry goods, and when providing a kind of conductor that can make the short-circuited conducting sleeve that has certain wall thickness and shape up and down and be equipped with stria shape conductor in the middle of it to solidify from top to bottom, realize the low-pressure casting method of the cage rotor of directional solidification.
According to the present invention, it provides a kind of low-pressure casting method of cage rotor, the employed low-pressure casting apparatus of this method comprises: the material pipe that immerses the maintenance furnace bottom end that contains metallic solution and can pressurize, the upper end of material pipe is connected with the cup portion that has down gate, counterdie has the die cavity that reaches short-circuited conducting sleeve to be provided with for last down gate and the mould cast gate that can be communicated with, intermediate die has the die cavity that the groove used for the central shaft periphery conductor that is inserted is provided with, this die cavity is round the periphery of laminated iron core and arrange, patrix has the die cavity that is provided with for last short-circuited conducting sleeve, cup portion, counterdie, the mutual place, composition surface of intermediate die and patrix is separable, with the first preheating device preheating patrix, simultaneously axle and laminated iron core are assembled in intermediate die and the counterdie, and with the second preheating device preheating, make its temperature be higher than the temperature of patrix, after this, will be from the patrix of each preheating device taking-up, intermediate die and counterdie fit together, and carry out low pressure casting.
At this moment, to fit together from patrix, intermediate die and the counterdie that each preheating device takes out, after this or before this, heating once more below counterdie, perhaps before will preheating with second preheating device intact, within second preheating device, below counterdie, heat once more intermediate die and counterdie.
According to the present invention, because the preheat temperature of intermediate die and counterdie is higher than the preheat temperature of patrix, therefore, metallic solution solidifies after being full of whole caves, chamber again, even for stria shape conductor in the middle of it, the conductor that has the short-circuited conducting sleeve of definite shape and wall thickness up and down, also can realize the directional solidification from the top to the below, thereby eliminated conductor and cast existing defective, and, utilization is to the method for heating once more below the counterdie, realized directional solidification so more accurately, particularly, because near between the mould cast gate that finally solidifies last down gate that part (boundary member of liquid phase and solid phase) stays cup portion and counterdie in the metal pattern, therefore, counterdie can be easy to separate with cup.
Fig. 1 is the operation schematic diagram of the low-pressure casting method of the embodiment of the invention.
Fig. 2 is the skiagraph of prior art low-pressure casting method.
Fig. 3 is the skiagraph of general cage rotor fan shape.
Among the figure:
1 metallic solution, 2 protection stoves
3 material pipes, 4 cups
5 counterdie 5a die cavitys
6 intermediate die 6a axles
7 stacked iron plate 7a die cavitys
8 patrix 8a die cavitys
11 first preheating devices, 12 second preheating devices
13 the 3rd preheating devices
Fig. 1 shows the operation of an embodiment of low-pressure casting method, except that preheating device, represents with same sequence number with Fig. 2 components identical among the figure.Cup 4, material pipe 3 and protection stove 2 etc. are identical with Fig. 2, hereinafter its structural feature are illustrated with reference to Fig. 2 again.The protection stove 2 that has air scoop 2a and lid 2b holds the metallic solution 1 that can replenish is arranged, and the bottom of material pipe 3 is immersed in the metallic solution 1.The upper end of material pipe 3 thickly is bonded together with upper and lower separable mode and cup 4 liquid that have down gate 4a.Have on the counterdie 5 on down gate 4a, the mould cast gate 5b that can be communicated with and the die cavity 5a that is provided with of short-circuited conducting sleeve down.In intermediate die 6, have the die cavity 7a that the groove used for the central shaft 6a external conductor that is inserted is provided with, this die cavity 7a is provided with around laminated iron core 7.Have the die cavity 8a that is provided with for last short-circuited conducting sleeve on the patrix 8 and be the set die cavity 8b of the wing.Cup 4, counterdie 5, intermediate die 6 and patrix 8 can separate at the face place of being bonded with each other.
Now the low-pressure casting method of embodiment is narrated.Carry out preheating with 11 pairs of patrixes of first preheating device 8, simultaneously axle 6a and laminated iron core 7 are assembled in intermediate die 6 and the counterdie 5, and, make its temperature be higher than the preheat temperature of patrix 8 with 12 preheatings of second preheating device.After this, from each preheating device 11,12, take out patrix 8, intermediate die 6 and counterdie 5 and fit together, utilize mode shown in Figure 2 to carry out low pressure casting again.After the patrix 8 that from each preheating device 11,12, takes out, intermediate die 6 and counterdie 5 assemblings or before this, the most handy the 3rd preheating device 13 is heating once more below counterdie 5, perhaps be preferably in before intermediate die 6 and 12 preheatings of counterdie 5 usefulness second preheating device are over, within second preheating device 12, heating once more below counterdie 5.First preheating device 11 and second preheating device 12 can adopt gas furnace or electric furnace, the 3rd preheating device 13 can adopt induction heater, perhaps first preheating device 11 and second preheating device 12 use induction heating equipment, and the 3rd preheating device 13 uses gas burner.
For this method, because the preheat temperature of intermediate die 6 and counterdie 5 is higher than the preheat temperature of patrix 8, so metallic solution solidifies after all being full of die cavity again, even for such conductor, has the stria shape conductor 77 in the middle of being positioned on it, upper and lower short-circuited conducting sleeve 78,75 with definite shape and wall thickness also can be realized the directional solidification from the top to the below, has eliminated conductor and has cast existing defective.And, utilization is to the method for heating once more below the counterdie 5, like this, realized directional solidification more accurately, particularly, because near locating between the mould cast gate 5b that finally solidifies last down gate 4a that part (boundary member of liquid phase and solid phase) stays cup portion 4 and counterdie 5 in the metal pattern, therefore, counterdie 5 can be easy to separate with cup portion 4.
The low-pressure casting method of cage rotor provided by the present invention, because the preheat temperature of intermediate die and counterdie is higher than the preheat temperature of patrix, therefore, metallic solution just solidifies after being full of all die cavitys, even for such conductor, and the words of stria shape conductor in the middle of it, short-circuited conducting sleeve with definite shape and wall thickness is located at that it is upper and lower, also can realize the directional solidification of from the top to the below, solidifying, thereby eliminate the defective of conductor casting, reach desired effects.And, utilization is to the method for heating once more below the counterdie, can realize directional solidification more accurately, particularly, because near the part of the final set in the metal pattern (boundary member of liquid phase and solid phase) is stayed and is located between the mould cast gate of the last down gate of cup portion and counterdie, therefore, counterdie be easy to cup part from, reach desired effect.
Claims (3)
1; a kind of low-pressure casting method of cage rotor; the employed low-pressure casting apparatus of this method comprises; contain metallic solution; the protection furnace bottom end that can pressurize is provided with the material pipe; the upper end of material pipe is connected with the cup with last down gate; promising down gate and the mould cast gate that can be communicated with and short-circuited conducting sleeve and the die cavity that is provided with down gone up on the counterdie; have the die cavity that the groove used for the central shaft external conductor that is inserted is provided with in the intermediate die; this die cavity is arranged around the laminated iron core periphery; have the die cavity of establishing for last short-circuited conducting sleeve on the patrix; cup; counterdie; the face that the is bonded with each other place of intermediate die and patrix can separate; it is characterized in that; whole patrix is with the first preheating device preheating; be assembled with the axle and the intermediate die of laminated iron core and counterdie simultaneously with the second preheating device preheating; make its temperature be higher than the preheat temperature of patrix; after this, from each preheating device, take out patrix; intermediate die and counterdie fit together and carry out low pressure casting.
According to the low-pressure casting method of the described cage rotor of claim 1, it is characterized in that 2, the patrix that takes out, intermediate die and counterdie are assembled afterwards or before this, heated once more below counterdie from each preheating device.
3, according to the low-pressure casting method of the described cage rotor of claim 1, it is characterized in that, before intermediate die and counterdie are over the second preheating device preheating, within second preheating device, heating once more below counterdie.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94117936 CN1122065A (en) | 1994-10-26 | 1994-10-26 | Method for low pressure casti squirrel-cage rotator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94117936 CN1122065A (en) | 1994-10-26 | 1994-10-26 | Method for low pressure casti squirrel-cage rotator |
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| Publication Number | Publication Date |
|---|---|
| CN1122065A true CN1122065A (en) | 1996-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94117936 Pending CN1122065A (en) | 1994-10-26 | 1994-10-26 | Method for low pressure casti squirrel-cage rotator |
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| CN (1) | CN1122065A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423414C (en) * | 2006-07-25 | 2008-10-01 | 周西省 | Casting process of copper squirrel rotor |
| CN100493777C (en) * | 2007-08-24 | 2009-06-03 | 云南铜业压铸科技有限公司 | Die-casting method of induction motor copper cage rotor and die casting device thereof |
| CN101847913A (en) * | 2009-03-24 | 2010-09-29 | 通用汽车环球科技运作公司 | The die casting of electric rotors |
| CN102738988A (en) * | 2011-04-04 | 2012-10-17 | 发那科株式会社 | Squirrel-cage rotor and production method thereof |
| CN103203445A (en) * | 2013-03-29 | 2013-07-17 | 福建尤迪电机制造有限公司 | Preparation method of cast copper cage rotor |
| CN103386475A (en) * | 2012-05-07 | 2013-11-13 | 绿友机械集团股份有限公司 | Low-pressure casting method for spiral cutter |
| CN109986056A (en) * | 2018-01-11 | 2019-07-09 | 山西电机制造有限公司 | A kind of cast-aluminum rotor low-voltage cast aluminum process |
| WO2020015608A1 (en) | 2018-07-20 | 2020-01-23 | 福建浦汇科技发展有限公司 | Method for casting aluminum in rotor |
| CN117259727A (en) * | 2023-11-22 | 2023-12-22 | 山西福森诺智能装备科技有限公司 | Low-pressure casting device and method for squirrel-cage rotor |
-
1994
- 1994-10-26 CN CN 94117936 patent/CN1122065A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423414C (en) * | 2006-07-25 | 2008-10-01 | 周西省 | Casting process of copper squirrel rotor |
| CN100493777C (en) * | 2007-08-24 | 2009-06-03 | 云南铜业压铸科技有限公司 | Die-casting method of induction motor copper cage rotor and die casting device thereof |
| CN101847913B (en) * | 2009-03-24 | 2013-10-16 | 通用汽车环球科技运作公司 | Pressure casting of electric rotors |
| CN101847913A (en) * | 2009-03-24 | 2010-09-29 | 通用汽车环球科技运作公司 | The die casting of electric rotors |
| US8403026B2 (en) | 2009-03-24 | 2013-03-26 | GM Global Technology Operations LLC | Pressure casting of electric rotors |
| CN102738988A (en) * | 2011-04-04 | 2012-10-17 | 发那科株式会社 | Squirrel-cage rotor and production method thereof |
| CN102738988B (en) * | 2011-04-04 | 2013-11-20 | 发那科株式会社 | Squirrel-cage rotor and production method thereof |
| CN103386475A (en) * | 2012-05-07 | 2013-11-13 | 绿友机械集团股份有限公司 | Low-pressure casting method for spiral cutter |
| CN103203445A (en) * | 2013-03-29 | 2013-07-17 | 福建尤迪电机制造有限公司 | Preparation method of cast copper cage rotor |
| CN103203445B (en) * | 2013-03-29 | 2016-09-21 | 福建尤迪电机制造有限公司 | A kind of preparation method of cast copper cage rotor |
| CN109986056A (en) * | 2018-01-11 | 2019-07-09 | 山西电机制造有限公司 | A kind of cast-aluminum rotor low-voltage cast aluminum process |
| CN109986056B (en) * | 2018-01-11 | 2020-11-06 | 山西电机制造有限公司 | Low-pressure aluminum casting process method for cast aluminum rotor |
| WO2020015608A1 (en) | 2018-07-20 | 2020-01-23 | 福建浦汇科技发展有限公司 | Method for casting aluminum in rotor |
| US11198176B2 (en) | 2018-07-20 | 2021-12-14 | Fujian Puhui Technology Development Co., Ltd | Method for casting aluminum in rotor |
| CN117259727A (en) * | 2023-11-22 | 2023-12-22 | 山西福森诺智能装备科技有限公司 | Low-pressure casting device and method for squirrel-cage rotor |
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