CN113319265A - Low-pressure aluminum casting process and die for aluminum casting rotor with special end plate structure - Google Patents
Low-pressure aluminum casting process and die for aluminum casting rotor with special end plate structure Download PDFInfo
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- CN113319265A CN113319265A CN202110802448.5A CN202110802448A CN113319265A CN 113319265 A CN113319265 A CN 113319265A CN 202110802448 A CN202110802448 A CN 202110802448A CN 113319265 A CN113319265 A CN 113319265A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/22—Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/0054—Casting in, on, or around objects which form part of the product rotors, stators for electrical motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D33/00—Equipment for handling moulds
- B22D33/04—Bringing together or separating moulds
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Abstract
The invention relates to a low-pressure aluminum casting process and a die for an aluminum casting rotor with a special end plate structure, belongs to the technical field of low-pressure aluminum casting, and solves the technical problems that the traditional low-pressure aluminum casting process and die are only suitable for common motors, aluminum leakage is easily caused for special motors, ventilation and heat dissipation of the motors are influenced, and the like. The solution is as follows: a low-pressure aluminum casting process for an aluminum casting rotor with a special end plate structure comprises the following steps: cold-state laminating; heating the rotor core; a preparation process; hot state laminating; and (5) low-pressure pouring. The utility model provides a special end plate structure cast aluminium rotor's low pressure cast aluminium mould, includes upper blade profile assembly, lower blade profile assembly, rotor core and dummy shaft, and low pressure cast aluminium mould still includes first closing device and four groups of second closing device, and the second closing device includes pull rod and cardboard. The low-pressure aluminum casting process is suitable for the aluminum casting rotor with the special end plate structure, the hidden danger of aluminum leakage in the aluminum casting process of the aluminum casting rotor with the special end plate structure is thoroughly eliminated, and the success rate of the aluminum casting rotor is improved.
Description
Technical Field
The invention belongs to the technical field of low-pressure cast aluminum, and particularly relates to a low-pressure cast aluminum process and a die for a cast aluminum rotor with a special end plate structure.
Background
The existing low-pressure aluminum casting process technology for the motor rotor can completely meet the requirements of conventional air duct rotor aluminum casting and non-air duct rotors, but has some defects in the traditional mold and process for the aluminum casting rotor with a special structure.
Fig. 1 is a rotor end plate with a special structure of a motor, and fig. 2 is a common rotor end plate of a motor, which can be seen that the difference is that the positions of tooth pressing strips are different, the particularity of fig. 1 is that the tooth pressing strips are located between two grooves, the distance between the two grooves is large, the tooth pressing strips of fig. 2 are located behind the grooves, and the positions of the tooth pressing strips are different, so that the low-pressure aluminum casting process and the die of the common cast aluminum rotor of the motor cannot meet the requirements of the cast aluminum rotor of fig. 1.
For the special rotor end plate structure shown in fig. 1, in the aluminum casting process, if aluminum leakage occurs, aluminum liquid is solidified between the groove shape and the tooth pressing strip, and due to the existence of the middle tooth pressing strip, the solidified aluminum liquid cannot be cleaned, so that ventilation and heat dissipation of the motor are seriously affected, and a serious rotor can only be scrapped.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a low-pressure aluminum casting process and a die for a cast aluminum rotor with a special end plate structure, and solves the technical problems that the traditional low-pressure aluminum casting process and die are only suitable for common motors, aluminum leakage is easily caused for special motors, ventilation and heat dissipation of the motors are influenced, and the like.
In order to solve the problems, the technical scheme of the invention is as follows: a low-pressure aluminum casting process for an aluminum casting rotor with a special end plate structure is disclosed, wherein the low-pressure aluminum casting process comprises the following steps: the method comprises the following steps:
1) cold-state laminating: sequentially overlapping and sleeving a plurality of rotor punching sheets on a dummy shaft, putting the overlapped rotor punching sheets into an oil press for overlapping to form a rotor iron core, wherein the tonnage of the oil press is 30-50T, the overlapping pressure applied by the oil press is 2.5-3.0MPa, and after the rotor iron core reaches a first specified length, the rotor punching sheets are overlapped and fastened by a gland and a lifting bolt;
2) heating the rotor core: conveying the laminated rotor iron core obtained in the step 1) to a heating furnace for heating, heating the rotor iron core at a heating speed of 70-90 ℃ for 1 hour, then preserving heat for 1 hour, heating the rotor iron core at a heating speed of 70-90 ℃ for 1 hour, preserving heat for 1 hour, finally heating the rotor iron core at a heating speed of 80-100 ℃ for 1 hour, preserving heat for 5 hours, and finally obtaining the final temperature ()
3) The preparation process comprises the following steps: connecting a lower base plate and a lower die, then placing the lower base plate and the lower die on the oil press in the step 1), and placing a flow divider, and completing preparation of a pull rod and a clamping block;
4) thermal state laminating: lifting the rotor core heated in the step 2) out of the heating furnace, placing the rotor core on the lower die placed in the step 3), then placing the upper blade type assembly on the rotor core, simultaneously enabling the compression through hole in the upper backing plate to penetrate through the upper end of the pull rod, primarily fastening by using a compression nut, starting the oil press in the step 3), continuously laminating the rotor core, and fastening the compression nut again after the second specified length is reached;
5) low-pressure pouring: and (4) quickly hoisting the fastened die in the step 4) to a low-pressure aluminum casting machine for aluminum casting, wherein the aluminum casting process parameters are carried out according to a set low-pressure aluminum casting curve.
Further, the burr of the rotor punching sheet is smaller than 0.05 mm.
Further, the second predetermined length of the rotor core in hot lamination is equal to the second predetermined length of the rotor core in cold lamination × 1.013.
The utility model provides a special end plate structure cast aluminium rotor's low pressure cast aluminium mould, includes upper segment type assembly, lower segment type assembly, rotor core and dummy shaft, upper segment type assembly includes upper padding plate and last mould, lower segment type assembly includes lower padding plate and lower mould, the dummy shaft includes the axis body of vertical setting, locates the dummy shaft upper cover on axis body upper portion and locates the dummy shaft lower cover of axis body lower part, be provided with the shunt between dummy shaft and the lower mould, wherein: the low-pressure cast aluminum mould also comprises a first pressing device and four groups of second pressing devices, wherein the first pressing device is arranged at the top of the dummy shaft and is used for pressing the middle part of the rotor iron core;
clamping grooves in the horizontal direction are respectively arranged in the middle of four corners of the lower backing plate, a U-shaped hole is formed in the lower backing plate above the clamping grooves, the opening of the U-shaped hole faces the outer side, and a pressing through hole is formed in the position, corresponding to the U-shaped hole, of the upper backing plate; the second pressing device comprises a pull rod and a clamping plate, the clamping plate is arranged in the clamping groove, the pull rod is vertically arranged, the bottom end of the pull rod penetrates through a U-shaped hole to be connected with the top surface of the clamping plate, and the top end of the pull rod penetrates through a corresponding pressing through hole and then is fixed through a pressing nut.
Further, the area of the horizontal cross section of the clamping groove is larger than that of the horizontal cross section of the U-shaped hole.
Further, the first pressing device comprises a pressing cover and an eye bolt; the gland is a cylindrical barrel with an opening at the bottom, the gland is arranged on the top end of the dummy shaft through a coaxial cover, the bottom edge of the gland is pressed on the top surface of the rotor core, a first threaded hole is formed in the middle of the upper cover of the dummy shaft, a second threaded hole is formed in the position, opposite to the first threaded hole, of the top surface of the gland, and the lower end of the lifting bolt penetrates through the second threaded hole to be matched and connected with the first threaded hole.
Furthermore, two groups of hanging rings are arranged on the top surface of the upper backing plate.
Furthermore, a first through hole is formed in the middle of the shaft body in the vertical direction, an annular clamping groove is coaxially formed in the bottom end of the first through hole, and the inner diameter of the annular clamping groove is larger than that of the first through hole;
the lower false shaft cover comprises a circular cover plate and a cover body arranged on the top surface of the circular cover plate, the cover body is of a vertically arranged cylindrical structure, the upper part of the cover body extends into the first through hole, the bottom surface of the shaft body is arranged on the top surface of the circular cover plate, an annular clamping table matched with the annular clamping groove is arranged on the outer wall of the lower part of the cover body, the outer diameter of the circular cover plate is larger than that of the shaft body, and a second through hole is formed in the middle of the lower false shaft cover in the vertical direction;
the shunt is cylindrical structure, shunt top surface middle part be provided with circular cover matched with apron standing groove, the coaxial cylinder arch that is provided with of apron standing groove center department, the cylinder arch stretches into in the second through-hole just circular cover locates in the apron standing groove, shunt bottom surface center department is provided with the circular arc arch of downward uplift.
Further, clearance fit is formed between the cylindrical protrusions and the second through holes and between the cover plate placing grooves and the circular cover plate.
Further, the outer edge of the bottom surface of the circular cover plate, the outer edge of the bottom surface of the flow divider, the edge of the bottom surface of the cover plate placing groove and the edge of the bottom surface of the second through hole are provided with chamfers.
The invention has the beneficial effects that:
the low-pressure aluminum casting process is suitable for the aluminum casting rotor with the special end plate structure, the combination of cold-state laminating, hot-state laminating and an oil press is combined, and the first pressing device and the second pressing device are matched for pressing, so that the laminating tightness is ensured, the hidden danger of aluminum leakage in the aluminum casting process of the aluminum casting rotor with the special end plate structure is thoroughly eliminated, the success rate of the aluminum casting rotor is improved, and the process is simple and low in cost.
The second pressing device fastens the upper backing plate and the lower backing plate through the pull rod, so that the upper die and the lower die and the rotor core are pressed, the structure is simple, complex pressing equipment is not required to be added for pressing, the operation is convenient, the adjustment is convenient, and the efficiency is also improved.
Drawings
FIG. 1 is a schematic view of a rotor end plate of a particular construction;
FIG. 2 is a schematic view of a rotor end plate of conventional construction;
FIG. 3 is a schematic structural view of a low-pressure cast aluminum mold according to the present invention;
FIG. 4 is a schematic structural view of a shaft body according to the present invention;
FIG. 5 is a schematic view showing the construction of a lower cover and a diverter of the dummy shaft according to the present invention;
FIG. 6 is a schematic view of a lower cushion plate of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and examples.
Example 1
In the embodiment, the low-pressure aluminum casting process for the aluminum casting rotor with the special end plate structure includes: the method comprises the following steps:
1) cold-state laminating: sequentially overlapping a plurality of rotor punching sheets on a dummy shaft 2, placing the overlapped rotor punching sheets into an oil press for laminating to form a rotor iron core 1, wherein the tonnage of the oil press is 30T, the laminating pressure applied by the oil press is 2.5MPa, and after the rotor iron core 1 reaches a first specified length, laminating is carried out, and then fastening is carried out by using a gland 8-1 and a lifting bolt 8-2;
2) heating the rotor core: conveying the laminated rotor iron core 1 in the step 1) to a heating furnace for heating, heating the rotor iron core at the temperature rising speed of 70 ℃ for 1 hour, then preserving heat for 1 hour, heating the rotor iron core at the temperature rising speed of 70 ℃ for 1 hour, preserving heat for 1 hour, finally heating the rotor iron core at the temperature rising speed of 80 ℃ for 1 hour, and preserving heat for 5 hours;
3) the preparation process comprises the following steps: connecting a lower base plate 5 and a lower die 6, placing the lower base plate on the oil press in the step 1), and placing a flow divider 7, a pull rod 9-1 and a fixture block 9-2 to finish preparation;
4) thermal state laminating: lifting the rotor iron core heated in the step 2) out of the heating furnace, placing the rotor iron core out of the lower die placed in the step 3), then placing the upper blade type assembly on the rotor iron core 1, simultaneously enabling the compression through hole 3-1 in the upper backing plate 3 to penetrate through the upper end of the pull rod 9-1, primarily fastening by using a compression nut 9-3, starting the oil press in the step 3), continuously laminating the rotor iron core 1, and fastening the compression nut 9-3 again after reaching a second specified length;
5) low-pressure pouring: and (4) quickly hoisting the fastened die in the step 4) to a low-pressure aluminum casting machine for aluminum casting, wherein the aluminum casting process parameters are carried out according to a set low-pressure aluminum casting curve.
Further, the burr of the rotor punching sheet is smaller than 0.05 mm.
Further, the second predetermined length of the rotor core in hot lamination is equal to the second predetermined length of the rotor core in cold lamination × 1.013.
Example 2
In the embodiment, the low-pressure aluminum casting process for the aluminum casting rotor with the special end plate structure includes: the method comprises the following steps:
1) cold-state laminating: sequentially overlapping a plurality of rotor punching sheets on a dummy shaft 2, placing the overlapped rotor punching sheets into an oil press for overlapping to form a rotor iron core 1, wherein the tonnage of the oil press is 40T, the overlapping pressure applied by the oil press is 2.8MPa, and after the rotor iron core 1 reaches a first specified length, the rotor punching sheets are overlapped and fastened by a gland 8-1 and a lifting bolt 8-2;
2) heating the rotor core: conveying the laminated rotor iron core 1 in the step 1) to a heating furnace for heating, heating the rotor iron core at the temperature rising speed of 80 ℃ for 1 hour, then preserving heat for 1 hour, heating the rotor iron core at the temperature rising speed of 80 ℃ for 1 hour, preserving heat for 1 hour, finally heating the rotor iron core at the temperature rising speed of 90 ℃ for 1 hour, and preserving heat for 5 hours;
3) the preparation process comprises the following steps: connecting a lower base plate 5 and a lower die 6, placing the lower base plate on the oil press in the step 1), and placing a flow divider 7, a pull rod 9-1 and a fixture block 9-2 to finish preparation;
4) thermal state laminating: lifting the rotor iron core heated in the step 2) out of the heating furnace, placing the rotor iron core out of the lower die placed in the step 3), then placing the upper blade type assembly on the rotor iron core 1, simultaneously enabling the compression through hole 3-1 in the upper backing plate 3 to penetrate through the upper end of the pull rod 9-1, primarily fastening by using a compression nut 9-3, starting the oil press in the step 3), continuously laminating the rotor iron core 1, and fastening the compression nut 9-3 again after reaching a second specified length;
5) low-pressure pouring: and (4) quickly hoisting the fastened die in the step 4) to a low-pressure aluminum casting machine for aluminum casting, wherein the aluminum casting process parameters are carried out according to a set low-pressure aluminum casting curve.
Further, the burr of the rotor punching sheet is smaller than 0.05 mm.
Further, the second predetermined length of the rotor core in hot lamination is equal to the second predetermined length of the rotor core in cold lamination × 1.013.
Example 3
In the embodiment, the low-pressure aluminum casting process for the aluminum casting rotor with the special end plate structure includes: the method comprises the following steps:
1) cold-state laminating: sequentially overlapping a plurality of rotor punching sheets on a dummy shaft 2, placing the overlapped rotor punching sheets into an oil press for overlapping to form a rotor iron core 1, wherein the tonnage of the oil press is 50T, the overlapping pressure applied by the oil press is 3.0MPa, and after the rotor iron core 1 reaches a first specified length, the rotor punching sheets are overlapped and fastened by a gland 8-1 and a lifting bolt 8-2;
2) heating the rotor core: conveying the laminated rotor iron core 1 in the step 1) to a heating furnace for heating, heating the rotor iron core at a heating speed of 90 ℃ for 1 hour, then preserving heat for 1 hour, heating the rotor iron core at a heating speed of 90 ℃ for 1 hour, preserving heat for 1 hour, finally heating the rotor iron core at a heating speed of 100 ℃ for 1 hour, and preserving heat for 5 hours;
3) the preparation process comprises the following steps: connecting a lower base plate 5 and a lower die 6, placing the lower base plate on the oil press in the step 1), and placing a flow divider 7, a pull rod 9-1 and a fixture block 9-2 to finish preparation;
4) thermal state laminating: lifting the rotor iron core heated in the step 2) out of the heating furnace, placing the rotor iron core out of the lower die placed in the step 3), then placing the upper blade type assembly on the rotor iron core 1, simultaneously enabling the compression through hole 3-1 in the upper backing plate 3 to penetrate through the upper end of the pull rod 9-1, primarily fastening by using a compression nut 9-3, starting the oil press in the step 3), continuously laminating the rotor iron core 1, and fastening the compression nut 9-3 again after reaching a second specified length;
5) low-pressure pouring: and (4) quickly hoisting the fastened die in the step 4) to a low-pressure aluminum casting machine for aluminum casting, wherein the aluminum casting process parameters are carried out according to a set low-pressure aluminum casting curve.
Further, the burr of the rotor punching sheet is smaller than 0.05 mm. The burr is controlled, the flatness of the end plate is ensured, and the warping phenomenon is avoided.
Further, the second predetermined length of the rotor core in hot lamination is equal to the second predetermined length of the rotor core in cold lamination × 1.013. Due to thermal expansion, the second specified length is 1.013 times of the first specified length, and the influence of temperature is eliminated.
In the process of heating the rotor core, the temperature rise speed is set, the temperature rise speed cannot be caused to be too high, the rotor punching is prevented from warping in the heating process, the quality of the rotor is affected, the final heat preservation temperature is 20-30 ℃ higher than the temperature in the common end plate structure process, because the heat loss in the follow-up hot-state laminating process is considered, the cold-state laminating and hot-state laminating processes are adopted, the double pressing of the inside and the outside of the first pressing device 8 and the second pressing device 9 is matched, the hidden danger of aluminum leakage in the aluminum casting process is eliminated, and the quality of the aluminum casting rotor is improved.
As shown in fig. 2-6, the low-pressure cast aluminum mold of a cast aluminum rotor with a special end plate structure comprises an upper blade assembly, a lower blade assembly, a rotor core 1 and a dummy shaft 2, wherein the upper blade assembly comprises an upper base plate 3 and an upper die 4, the lower blade assembly comprises a lower base plate 5 and a lower die 6, the dummy shaft 2 comprises a vertically arranged shaft body 2-1, a dummy shaft upper cover 2-2 arranged on the upper part of the shaft body 2-1 and a dummy shaft lower cover 2-3 arranged on the lower part of the shaft body 2-1, and a flow divider 7 is arranged between the dummy shaft 2 and the lower die 6, wherein: the low-pressure cast aluminum mould also comprises a first pressing device 8 and four groups of second pressing devices 9, wherein the first pressing device 8 is arranged at the top of the dummy shaft 2 and used for pressing the middle part of the rotor iron core 1;
the middle parts of four corners of the lower backing plate 5 are respectively provided with a clamping groove 5-1 in the horizontal direction, a U-shaped hole 5-2 is formed in the lower backing plate 5 above the clamping groove 5-1, the opening of the U-shaped hole 5-2 faces the outside, and a pressing through hole 3-1 is formed in the position, corresponding to the U-shaped hole 5-2, of the upper backing plate 3; the second pressing device 9 comprises a pull rod 9-1 and a clamping plate 9-2, the clamping plate 9-2 is arranged in the clamping groove 5-1, the pull rod 9-1 is vertically arranged, the bottom end of the pull rod 9-1 penetrates through the U-shaped hole 5-2 to be connected with the top surface of the clamping plate 9-2, and the top end of the pull rod 9-1 penetrates through the corresponding pressing through hole 3-1 and then is fixed through a pressing nut 9-3. The outer wall of the upper section of the pull rod 9-1 is provided with an external thread, the compression nut 9-3 is in threaded connection with the external thread on the pull rod 9-1, the second compression device 9 is simple in structure, convenient to operate and low in cost, and the compression nut 9-3 completes fastening in the hot-state laminating process.
The arrangement of the clamping groove 5-1 and the U-shaped hole 5-2 saves space, can realize compaction without adding external compaction equipment, has low cost and cannot influence the lower die 6.
Further, the area of the horizontal cross section of the clamping groove 5-1 is larger than that of the U-shaped hole 5-2. The clamping plate 9-2 is limited, and the clamping plate 9-2 is prevented from falling off in the fastening process.
Further, the first pressing device 8 comprises a pressing cover 8-1 and an eye bolt 8-2; the pressing cover 8-1 is a cylindrical barrel with an opening at the bottom, the pressing cover 8-1 is coaxially arranged at the top end of the dummy shaft 2 in a covering mode, the bottom edge of the pressing cover 8-1 is pressed on the top surface of the rotor core 1, a first threaded hole 2-2-1 is formed in the middle of the upper cover 2-2 of the dummy shaft, a second threaded hole 8-1-1 is formed in the position, opposite to the first threaded hole 2-2-1, of the top surface of the pressing cover 8-1, and the lower end of the lifting bolt 8-2 penetrates through the second threaded hole 8-1-1 to be connected with the first threaded hole 2-2-1 in a matching mode. The first pressing device 8 presses the rotor core 1 by the pressing cover 8-1 by tightening the eye bolt 8-2.
Further, two groups of lifting rings 3-2 are arranged on the top surface of the upper backing plate 3. The hoisting ring 3-2 is convenient to hoist and transport.
Further, a first through hole 2-1-1 is formed in the middle of the shaft body 2-1 in the vertical direction, an annular clamping groove 2-1-2 is coaxially formed in the bottom end of the first through hole 2-1-1, and the inner diameter of the annular clamping groove 2-1-2 is larger than that of the first through hole 2-1-1;
the false shaft lower cover 2-3 comprises a circular cover plate 2-3-1 and a cover body 2-3-2 arranged on the top surface of the circular cover plate 2-3-1, the cover body 2-3-2 is a vertically arranged cylindrical structure, the upper part of the cover body 2-3-2 extends into the first through hole 2-1-1, the bottom surface of the shaft body 2-1 is arranged on the top surface of the circular cover plate 2-3-1, the outer wall of the lower part of the cover body 2-3-2 is provided with an annular clamping table 2-3-3 matched with the annular clamping groove 2-1-2, the outer diameter of the circular cover plate 2-3-1 is larger than that of the shaft body 2-1, a second through hole 2-3-4 is formed in the middle of the lower cover 2-3 of the dummy shaft in the vertical direction;
the flow divider 7 is of a cylindrical structure, a cover plate placing groove 7-1 matched with the circular cover plate 2-3-1 is arranged in the middle of the top surface of the flow divider 7, a cylindrical protrusion 7-2 is coaxially arranged at the center of the cover plate placing groove 7-1, the cylindrical protrusion 7-2 extends into the second through hole 2-3-4, the circular cover plate 2-3-1 is arranged in the cover plate placing groove 7-1, and an arc protrusion 7-3 protruding downwards is arranged at the center of the bottom surface of the flow divider 7. The arrangement of the circular arc bulge 7-3 ensures that the aluminum liquid is more uniformly distributed, and the pouring quality is improved.
Furthermore, the cylindrical protrusion 7-2 and the second through hole 2-3-4 are in clearance fit with each other, and the cover plate placing groove 7-1 and the circular cover plate are in clearance fit with each other. The clearance fit between the flow divider 7 and the false shaft lower cover 2-3 facilitates both installation and disassembly.
Furthermore, chamfers are arranged on the outer edge of the bottom surface of the circular cover plate 2-3-1, the outer edge of the bottom surface of the flow divider 7, the edge of the bottom surface of the cover plate placing groove 7-1 and the edge of the bottom surface of the second through hole 2-3-4.
Claims (10)
1. A low-pressure aluminum casting process of an aluminum casting rotor with a special end plate structure is characterized in that: the method comprises the following steps:
1) cold-state laminating: sequentially overlapping and sleeving a plurality of rotor punching sheets on a dummy shaft (2), putting the overlapped rotor punching sheets into an oil press for overlapping to form a rotor iron core (1), wherein the tonnage of the oil press is 30-50T, the overlapping pressure applied by the oil press is 2.5-3.0MPa, and after the rotor iron core (1) reaches a first specified length, using a gland (8-1) and a lifting bolt (8-2) for fastening;
2) heating the rotor core: conveying the laminated rotor iron core (1) in the step 1) to a heating furnace for heating, heating the rotor iron core (1) at a heating speed of 70-90 ℃ for 1 hour, then preserving heat for 1 hour, heating the rotor iron core at a heating speed of 70-90 ℃ for 1 hour, preserving heat for 1 hour, finally heating the rotor iron core at a heating speed of 80-100 ℃ for 1 hour, and preserving heat for 5 hours;
3) the preparation process comprises the following steps: connecting a lower base plate (5) and a lower die (6), placing the lower base plate on the oil press in the step 1), placing a flow divider (7), and preparing a pull rod (9-1) and a clamping block (9-2);
4) thermal state laminating: lifting the rotor iron core heated in the step 2) out of the heating furnace, placing the rotor iron core out of the lower die placed in the step 3), then placing the upper blade type assembly on the rotor iron core (1), simultaneously enabling a compression through hole (3-1) in the upper backing plate (3) to penetrate through the upper end of a pull rod (9-1), primarily fastening by using a compression nut (9-3), starting an oil press in the step 3), continuously laminating the rotor iron core (1), and fastening the compression nut (9-3) again after reaching a second specified length;
5) low-pressure pouring: and (4) quickly hoisting the fastened die in the step 4) to a low-pressure aluminum casting machine for aluminum casting, wherein the aluminum casting process parameters are carried out according to a set low-pressure aluminum casting curve.
2. The low-pressure aluminum casting process for the cast aluminum rotor with the special end plate structure as claimed in claim 1, wherein the low-pressure aluminum casting process comprises the following steps: and burrs of the rotor punching sheet are smaller than 0.05 mm.
3. The low-pressure aluminum casting process for the cast aluminum rotor with the special end plate structure as claimed in claim 1, wherein the low-pressure aluminum casting process comprises the following steps: the second predetermined length of the rotor core in hot lamination is equal to the second predetermined length of the rotor core in cold lamination × 1.013.
4. The utility model provides a special end plate structure cast aluminium rotor's low pressure cast aluminium mould, includes leaf type assembly, lower leaf type assembly, rotor core (1) and dummy shaft (2), go up leaf type assembly and include upper padding plate (3) and go up mould (4), lower leaf type assembly includes lower padding plate (5) and lower mould (6), dummy shaft (2) including vertical axis body (2-1) that sets up, locate dummy shaft upper cover (2-2) on axis body (2-1) upper portion and locate dummy shaft lower cover (2-3) of axis body (2-1) lower part, be provided with shunt (7) between dummy shaft (2) and lower mould (6), its characterized in that: the low-pressure cast aluminum mould also comprises a first pressing device (8) and four groups of second pressing devices (9), wherein the first pressing device (8) is arranged at the top of the dummy shaft (2) and used for pressing the middle part of the rotor core (1);
clamping grooves (5-1) in the horizontal direction are respectively formed in the middle of four corners of the lower backing plate (5), U-shaped holes (5-2) are formed in the lower backing plate (5) above the clamping grooves (5-1), the openings of the U-shaped holes (5-2) face the outside, and compression through holes (3-1) are formed in the positions, corresponding to the U-shaped holes (5-2), of the upper backing plate (3); the second pressing device (9) comprises a pull rod (9-1) and a clamping plate (9-2), the clamping plate (9-2) is arranged in the clamping groove (5-1), the pull rod (9-1) is vertically arranged, the bottom end of the pull rod penetrates through the U-shaped hole (5-2) to be connected with the top surface of the clamping plate (9-2), and the top end of the pull rod (9-1) penetrates through a pressing through hole (3-1) corresponding to the pull rod and then is fixed through a pressing nut (9-3).
5. The low-pressure cast aluminum mold for a cast aluminum rotor with a special end plate structure as claimed in claim 4, wherein: the area of the horizontal cross section of the clamping groove (5-1) is larger than that of the horizontal cross section of the U-shaped hole (5-2).
6. The low-pressure cast aluminum mold for a cast aluminum rotor with a special end plate structure as claimed in claim 4, wherein: the first pressing device (8) comprises a pressing cover (8-1) and an eye bolt (8-2); the pressing cover (8-1) is a cylindrical barrel with an opening at the bottom, the pressing cover (8-1) is coaxially arranged at the top end of the dummy shaft (2) in a covering mode, the bottom edge of the pressing cover (8-1) is pressed on the top surface of the rotor core (1), a first threaded hole (2-2-1) is formed in the middle of the upper cover (2-2) of the dummy shaft, a second threaded hole (8-1-1) is formed in the position, opposite to the first threaded hole (2-2-1), of the top surface of the pressing cover (8-1), and the lower end of the lifting bolt (8-2) penetrates through the second threaded hole (8-1-1) to be connected with the first threaded hole (2-2-1) in a matched mode.
7. The low-pressure cast aluminum mold for a cast aluminum rotor with a special end plate structure as claimed in claim 4, wherein: two groups of lifting rings (3-2) are arranged on the top surface of the upper backing plate (3).
8. The low-pressure cast aluminum mold for a cast aluminum rotor with a special end plate structure as claimed in claim 4, wherein: a first through hole (2-1-1) is formed in the middle of the shaft body (2-1) in the vertical direction, an annular clamping groove (2-1-2) is coaxially formed in the bottom end of the first through hole (2-1-1), and the inner diameter of the annular clamping groove (2-1-2) is larger than that of the first through hole (2-1-1);
the false shaft lower cover (2-3) comprises a circular cover plate (2-3-1) and a cover body (2-3-2) arranged on the top surface of the circular cover plate (2-3-1), the cover body (2-3-2) is of a vertically arranged cylindrical structure, the upper part of the cover body (2-3-2) extends into the first through hole (2-1-1), the bottom surface of the shaft body (2-1) is arranged on the top surface of the circular cover plate (2-3-1), an annular clamping table (2-3-3) matched with the annular clamping groove (2-1-2) is arranged on the outer wall of the lower part of the cover body (2-3-2), the outer diameter of the circular cover plate (2-3-1) is larger than that of the shaft body (2-1), a second through hole (2-3-4) is formed in the middle of the dummy shaft lower cover (2-3) in the vertical direction;
the flow divider (7) is of a cylindrical structure, a cover plate placing groove (7-1) matched with the circular cover plate (2-3-1) is formed in the middle of the top surface of the flow divider (7), a cylindrical protrusion (7-2) is coaxially arranged at the center of the cover plate placing groove (7-1), the cylindrical protrusion (7-2) extends into the second through hole (2-3-4), the circular cover plate (2-3-1) is arranged in the cover plate placing groove (7-1), and an arc protrusion (7-3) protruding downwards is arranged at the center of the bottom surface of the flow divider (7).
9. A low pressure cast aluminum rotor mold as in claim 8 adapted to accommodate different bore diameters, wherein: the cylindrical protrusion (7-2) and the second through hole (2-3-4) are in clearance fit, and the cover plate placing groove (7-1) and the circular cover plate are in clearance fit.
10. A low pressure cast aluminum rotor mold as in claim 8 adapted to accommodate different bore diameters, wherein: the outer edge of the bottom surface of the circular cover plate (2-3-1), the outer edge of the bottom surface of the flow divider (7), the edge of the bottom surface of the cover plate placing groove (7-1) and the edge of the bottom surface of the second through hole (2-3-4) are provided with chamfers.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802448.5A CN113319265A (en) | 2021-07-15 | 2021-07-15 | Low-pressure aluminum casting process and die for aluminum casting rotor with special end plate structure |
| EP22841224.3A EP4209290A4 (en) | 2021-07-15 | 2022-07-05 | Low-pressure aluminum casting mold and low-pressure aluminum casting process for motor rotor |
| PCT/CN2022/103843 WO2023284587A1 (en) | 2021-07-15 | 2022-07-05 | Low-pressure aluminum casting mold and low-pressure aluminum casting process for motor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802448.5A CN113319265A (en) | 2021-07-15 | 2021-07-15 | Low-pressure aluminum casting process and die for aluminum casting rotor with special end plate structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113319265A true CN113319265A (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110802448.5A Pending CN113319265A (en) | 2021-07-15 | 2021-07-15 | Low-pressure aluminum casting process and die for aluminum casting rotor with special end plate structure |
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| Country | Link |
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| CN (1) | CN113319265A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769549A (en) * | 2022-04-27 | 2022-07-22 | 台州市重点机械厂 | Motor rotor slow-pushing booster-type casting process |
| WO2023284587A1 (en) * | 2021-07-15 | 2023-01-19 | 山西电机制造有限公司 | Low-pressure aluminum casting mold and low-pressure aluminum casting process for motor rotor |
| CN116944470A (en) * | 2023-09-21 | 2023-10-27 | 山西电机制造有限公司 | Low-pressure casting die and casting method for motor rotor core |
-
2021
- 2021-07-15 CN CN202110802448.5A patent/CN113319265A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023284587A1 (en) * | 2021-07-15 | 2023-01-19 | 山西电机制造有限公司 | Low-pressure aluminum casting mold and low-pressure aluminum casting process for motor rotor |
| CN114769549A (en) * | 2022-04-27 | 2022-07-22 | 台州市重点机械厂 | Motor rotor slow-pushing booster-type casting process |
| CN116944470A (en) * | 2023-09-21 | 2023-10-27 | 山西电机制造有限公司 | Low-pressure casting die and casting method for motor rotor core |
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