Low-pressure die casting process and die for a special end plate structure cast aluminum rotor

Abstract

The present invention relates to a low-pressure aluminum casting process and a mold for a cast aluminum rotor with a special end plate structure, which belongs to the technical field of low-pressure aluminum casting and solves the technical problems that the traditional low-pressure aluminum casting process and mold are only suitable for ordinary motors, and are prone to aluminum leakage for special motors, affecting the ventilation and heat dissipation of the motor. The solution is: a low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure, the tooth pressure strip of the special end plate is located between two groove shapes, including the following steps: cold lamination; heating the rotor core; preparation process; hot lamination; low-pressure pouring; low-pressure aluminum casting mold, including an upper blade assembly, a lower blade assembly, a rotor core and a dummy shaft, the low-pressure aluminum casting mold also includes a first clamping device and four sets of second clamping devices, the second clamping device includes a pull rod and a clamping plate. The low-pressure aluminum casting process in the present invention is suitable for cast aluminum rotors with special end plate structures, completely eliminating the hidden dangers of aluminum leakage during the aluminum casting process of cast aluminum rotors with special end plate structures, and improving the success rate of cast aluminum rotors.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-pressure die casting of aluminum, and specifically relates to a low-pressure die casting process and a die for a cast aluminum rotor with a special end plate structure. Background Art

[0002] The existing low-pressure die casting process technology for motor rotors can fully meet the requirements for conventional ventilated-duct rotors and non-ventilated-duct rotors in die casting aluminum, but there are some drawbacks in the traditional dies and processes for cast aluminum rotors with special structures.

[0003] Figure 1 For a special structure rotor end plate of a motor, Figure 2 For a common rotor end plate of a motor, it can be seen that the difference lies in the inconsistent positions of the tooth bars. Figure 1 The particularity of lies in that the tooth bar is located between two groove shapes, and the distance between the two groove shapes is large. Figure 2 The tooth bar of is located behind the groove shape. The different positions of the tooth bars result in that the low-pressure die casting process and die of a common motor cast aluminum rotor cannot meet Figure 1 the requirements of the cast aluminum rotor described above.

[0004] For Figure 1 the special rotor end plate structure shown in , during the aluminum die casting process, if aluminum leakage occurs, the aluminum liquid will solidify between the groove shape and the tooth bar. Due to the existence of the middle tooth bar, the solidified aluminum liquid cannot be cleaned, seriously affecting the ventilation and heat dissipation of the motor. In severe cases, the rotor can only be scrapped. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology, and provide a low-pressure die casting process and a die for a cast aluminum rotor with a special end plate structure, solving the technical problems that the traditional low-pressure die casting process and die are only suitable for ordinary motors, and are prone to aluminum leakage for special motors, affecting the ventilation and heat dissipation of the motors.

[0006] To solve the above problems, the technical solution of the present invention is: a low-pressure die casting process for a cast aluminum rotor with a special end plate structure, where the tooth bar of the special end plate is located between two groove shapes, and includes the following steps:

[0007] 1) Cold state stacking and pressing: Stack multiple rotor punching sheets on the dummy shaft in sequence, put the stacked rotor punching sheet group into a hydraulic press for stacking and pressing to form a rotor core. The tonnage of the hydraulic press is 30 - 50T, the stacking and pressing pressure applied by the hydraulic press is 2.5 - 3.0 MPa. After stacking and pressing until the rotor core reaches the first specified length, fasten it with the gland and lifting eye bolts of the first pressing device;

[0008] 2) Heating the rotor core: sending the laminated rotor core in step 1) to a heating furnace for heating, heating the rotor core at a heating rate of 70-90°C / h for 1 hour, keeping the temperature for 1 hour, then heating it at a heating rate of 70-90°C / h for 1 hour, keeping the temperature for 1 hour, and finally heating it at a heating rate of 80-100°C / h for 1 hour, keeping the temperature for 5 hours;

[0009] 3) Preparation process: After connecting the lower pad and the lower die, place them on the hydraulic press in step 1), place the diverter, and prepare the tie rod and the card plate;

[0010] 4) Hot lamination: The rotor core heated in step 2) is lifted out of the heating furnace and placed on the lower die placed in step 3), and then the upper blade assembly is placed on the rotor core. At the same time, the clamping through hole on the upper pad passes through the upper end of the tie rod and is initially tightened with a clamping nut. The hydraulic press in step 3) is started to continue laminating the rotor core. After reaching the second specified length, the clamping nut is tightened again;

[0011] 5) Low-pressure pouring: The mold fastened in step 4) is quickly lifted to the low-pressure aluminum casting machine for aluminum casting. The aluminum casting process parameters are carried out according to the set low-pressure aluminum casting curve;

[0012] The mold includes an upper blade assembly, a lower blade assembly, a rotor core and a dummy shaft, the upper blade assembly includes an upper pad and an upper mold, the lower blade assembly includes a lower pad and a lower mold, the dummy shaft includes a vertically arranged shaft body, a dummy shaft upper cover arranged on the upper part of the shaft body and a dummy shaft lower cover arranged on the lower part of the shaft body, a flow divider is arranged between the dummy shaft and the lower mold, the mold also includes a first clamping device and four sets of second clamping devices, the first clamping device is arranged at the top of the dummy shaft to clamp the middle part of the rotor core;

[0013] Horizontal slots are respectively arranged in the middle of the four corners of the lower pad, a U-shaped hole is arranged on the lower pad above the slot, the opening of the U-shaped hole faces outward, and a clamping through hole is arranged at the position of the upper pad corresponding to the U-shaped hole; the second clamping device includes a pull rod and a clamping plate, the clamping plate is arranged in the slot, the pull rod is vertically arranged and the bottom end thereof passes through the U-shaped hole and is connected to the top surface of the clamping plate, and the top end of the pull rod passes through the corresponding clamping through hole and is fixed by a clamping nut.

[0014] Furthermore, the area of ​​the horizontal cross section of the slot is larger than the area of ​​the horizontal cross section of the U-shaped hole.

[0015] Furthermore, the burr of the rotor punching sheet is less than 0.05 mm.

[0016] Furthermore, the second specified length of the rotor core in hot lamination=the first specified length of the rotor core in cold lamination×1.013.

[0017] Furthermore, the first clamping device includes a pressure cover and a lifting eye bolt; the pressure cover is a cylindrical barrel with an opening at the bottom, the pressure cover is coaxially covered on the top of the dummy shaft, and the bottom edge of the pressure cover is pressed on the top surface of the rotor core, a first threaded hole is provided in the middle of the upper cover of the dummy shaft, a second threaded hole is provided at the top surface of the pressure cover relative to the first threaded hole, and the lower end of the lifting eye bolt passes through the second threaded hole and is matched with the first threaded hole.

[0018] Furthermore, two sets of lifting rings are provided on the top surface of the upper pad.

[0019] Furthermore, a first through hole is vertically arranged in the middle of the shaft body, and an annular groove is coaxially arranged at the bottom end of the first through hole, and the inner diameter of the annular groove is larger than the inner diameter of the first through hole;

[0020] The dummy shaft lower cover comprises a circular cover plate and a cover body arranged on the top surface of the circular cover plate, the cover body is a vertically arranged cylindrical structure, the upper part of the cover body extends into the first through hole and the bottom surface of the shaft body is arranged on the top surface of the circular cover plate, an annular clamping platform matching 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 the outer diameter of the shaft body, and a second through hole is arranged in the middle of the dummy shaft lower cover in the vertical direction;

[0021] The diverter is a cylindrical structure, and a cover plate placement groove matching the circular cover plate is arranged in the middle of the top surface of the diverter, a cylindrical protrusion is coaxially arranged at the center of the cover plate placement groove, the cylindrical protrusion extends into the second through hole and the circular cover plate is arranged in the cover plate placement groove, and a downwardly raised arc protrusion is arranged at the center of the bottom surface of the diverter.

[0022] Furthermore, there is a clearance fit between the cylindrical protrusion and the second through hole, and between the cover plate placement groove and the circular cover plate.

[0023] Furthermore, chamfers are arranged at the outer edge of the bottom surface of the circular cover plate, the outer edge of the bottom surface of the diverter, the bottom surface edge of the cover plate placement groove and the bottom surface edge of the second through hole.

[0024] Beneficial effects of the present invention:

[0025] The low-pressure aluminum casting process of the present invention is suitable for aluminum casting rotors with special end plate structures. The combination of cold lamination, hot lamination and oil press, and the clamping of the first clamping device and the second clamping device ensure the tightness of lamination, completely eliminate the hidden danger of aluminum leakage during the aluminum casting process of the aluminum casting rotors with special end plate structures, improve the success rate of aluminum casting rotors, and have simple process and low cost.

[0026] The second clamping device fastens the upper pad and the lower pad through the pull rod, thereby achieving the clamping of the upper and lower molds and the rotor core. It has a simple structure and does not require the addition of complex clamping equipment for clamping. It is easy to operate and adjust, and also improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a rotor end plate structure with a special structure;

[0028] Figure 2 A schematic diagram of a rotor end plate structure of a common structure;

[0029] Figure 3 It is a structural schematic diagram of the low-pressure aluminum casting mold of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the axle body in the present invention;

[0031] Figure 5 It is a structural schematic diagram of the false shaft lower cover and the diverter in the present invention;

[0032] Figure 6 It is a structural schematic diagram of a corner of the lower pad in the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Example 1

[0034] In this embodiment, a low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure is provided, wherein the tooth strip of the special end plate is located between two grooves, and the following steps are included:

[0035] 1) Cold lamination: Multiple rotor punching sheets are stacked on the dummy shaft 2 in sequence, and the stacked rotor punching sheet group is placed in a hydraulic press for lamination to form a rotor core 1. The tonnage of the hydraulic press is 30T, and the lamination pressure applied by the hydraulic press is 2.5MPa. After lamination, the rotor core 1 reaches a first specified length, and then is fastened with a gland 8-1 and an eye bolt 8-2 of a first clamping device 8;

[0036] 2) Heating the rotor core: sending the rotor core 1 laminated in step 1) to a heating furnace for heating, heating the rotor core at a heating rate of 70°C / h for 1 hour, keeping it warm for 1 hour, then heating it at a heating rate of 70°C / h for 1 hour, keeping it warm for 1 hour, and finally heating it at a heating rate of 80°C / h for 1 hour, keeping it warm for 5 hours;

[0037] 3) Preparation process: After connecting the lower pad 5 and the lower die 6, place them on the hydraulic press in step 1), place the diverter 7, and prepare the pull rod 9-1 and the clamping plate 9-2;

[0038] 4) Hot lamination: The rotor core heated in step 2) is lifted out of the heating furnace and placed on the lower die placed in step 3), and then the upper blade assembly is placed on the rotor core 1. At the same time, the clamping through hole 3-1 on the upper pad 3 passes through the upper end of the tie rod 9-1, and is initially tightened using the clamping nut 9-3. The hydraulic press in step 3) is started to continue laminating the rotor core 1. After reaching the second specified length, the clamping nut 9-3 is tightened again;

[0039] 5) Low-pressure pouring: The mold that has been tightened in step 4) is quickly lifted to the low-pressure aluminum casting machine for casting aluminum. The aluminum casting process parameters are carried out according to the set low-pressure aluminum casting curve.

[0040] Furthermore, the burr of the rotor punching sheet is less than 0.05 mm.

[0041] Furthermore, the second specified length of the rotor core in hot lamination=the first specified length of the rotor core in cold lamination×1.013. Example 2

[0042] In this embodiment, a low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure is provided, wherein the tooth strip of the special end plate is located between two grooves, and the following steps are included:

[0043] 1) Cold lamination: Multiple rotor punching sheets are stacked on the dummy shaft 2 in sequence, and the stacked rotor punching sheet group is placed in a hydraulic press for lamination to form a rotor core 1. The tonnage of the hydraulic press is 40T, and the lamination pressure applied by the hydraulic press is 2.8MPa. After lamination, the rotor core 1 reaches a first specified length, and then is fastened with a gland 8-1 and an eye bolt 8-2 of a first clamping device 8;

[0044] 2) Heating the rotor core: sending the rotor core 1 laminated in step 1) to a heating furnace for heating, heating the rotor core at a heating rate of 80°C / h for 1 hour, keeping it warm for 1 hour, then heating it at a heating rate of 80°C / h for 1 hour, keeping it warm for 1 hour, and finally heating it at a heating rate of 90°C / h for 1 hour, keeping it warm for 5 hours;

[0045] 3) Preparation process: After connecting the lower pad 5 and the lower die 6, place them on the hydraulic press in step 1), place the diverter 7, and prepare the pull rod 9-1 and the clamping plate 9-2;

[0046] 4) Hot lamination: The rotor core heated in step 2) is lifted out of the heating furnace and placed on the lower die placed in step 3), and then the upper blade assembly is placed on the rotor core 1. At the same time, the clamping through hole 3-1 on the upper pad 3 passes through the upper end of the tie rod 9-1, and is initially tightened using the clamping nut 9-3. The hydraulic press in step 3) is started to continue laminating the rotor core 1. After reaching the second specified length, the clamping nut 9-3 is tightened again;

[0047] 5) Low-pressure pouring: The mold that has been tightened in step 4) is quickly lifted to the low-pressure aluminum casting machine for casting aluminum. The aluminum casting process parameters are carried out according to the set low-pressure aluminum casting curve.

[0048] Furthermore, the burr of the rotor punching sheet is less than 0.05 mm.

[0049] Furthermore, the second specified length of the rotor core in hot lamination=the first specified length of the rotor core in cold lamination×1.013. Example 3

[0050] In this embodiment, a low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure is provided, wherein the tooth strip of the special end plate is located between two grooves, and the following steps are included:

[0051] 1) Cold lamination: Multiple rotor punching sheets are stacked on the dummy shaft 2 in sequence, and the stacked rotor punching sheet group is placed in a hydraulic press for lamination to form a rotor core 1. The tonnage of the hydraulic press is 50T, and the lamination pressure applied by the hydraulic press is 3.0MPa. After lamination, the rotor core 1 reaches a first specified length, and then is fastened with a gland 8-1 and an eye bolt 8-2 of a first clamping device 8;

[0052] 2) Heating the rotor core: sending the rotor core 1 laminated in step 1) to a heating furnace for heating, heating the rotor core at a heating rate of 90°C / h for 1 hour, keeping it warm for 1 hour, then heating it at a heating rate of 90°C / h for 1 hour, keeping it warm for 1 hour, and finally heating it at a heating rate of 100°C / h for 1 hour, keeping it warm for 5 hours;

[0053] 3) Preparation process: After connecting the lower pad 5 and the lower die 6, place them on the hydraulic press in step 1), place the diverter 7, and prepare the pull rod 9-1 and the clamping plate 9-2;

[0054] 4) Hot lamination: The rotor core heated in step 2) is lifted out of the heating furnace and placed on the lower die placed in step 3), and then the upper blade assembly is placed on the rotor core 1. At the same time, the clamping through hole 3-1 on the upper pad 3 passes through the upper end of the tie rod 9-1, and is initially tightened using the clamping nut 9-3. The hydraulic press in step 3) is started to continue laminating the rotor core 1. After reaching the second specified length, the clamping nut 9-3 is tightened again;

[0055] 5) Low-pressure pouring: The mold that has been tightened in step 4) is quickly lifted to the low-pressure aluminum casting machine for casting aluminum. The aluminum casting process parameters are carried out according to the set low-pressure aluminum casting curve.

[0056] Furthermore, the burr of the rotor punching sheet is less than 0.05 mm. The control of the burr ensures the flatness of the end plate and avoids warping.

[0057] Furthermore, the second specified length of the rotor core in hot lamination = the first specified length of the rotor core in cold lamination × 1.013. Due to thermal expansion, the second specified length is selected as 1.013 times the first specified length to eliminate the influence of temperature.

[0058] During the heating process of the rotor core, the setting of the heating rate will not cause the heating rate to be too high, thereby preventing the rotor punching sheets from warping during the heating process and affecting the rotor quality. The final insulation temperature is 20~30℃ higher than the temperature in the ordinary end plate structure process. Considering the heat loss in the subsequent hot lamination process, the cold lamination and hot lamination process are used twice, and the internal and external double clamping of the first clamping device 8 and the second clamping device 9 are used to eliminate the hidden danger of aluminum leakage during the aluminum casting process and improve the quality of the cast aluminum rotor.

[0059] like Figure 2-6 A low-pressure aluminum casting mold for a cast aluminum rotor with a special end plate structure is shown, comprising 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 pad 3 and an upper mold 4, the lower blade assembly comprises a lower pad 5 and a lower mold 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, a flow divider 7 is arranged between the dummy shaft 2 and the lower mold 6, the mold further comprises a first clamping device 8 and four sets of second clamping devices 9, the first clamping device 8 is arranged at the top of the dummy shaft 2 to clamp the middle part of the rotor core 1;

[0060] The lower pad 5 is provided with horizontal slots 5-1 in the middle of the four corners, and a U-shaped hole 5-2 is provided on the lower pad 5 above the slot 5-1, the opening of the U-shaped hole 5-2 faces outward, and a clamping through hole 3-1 is provided at the position corresponding to the U-shaped hole 5-2 on the upper pad 3; the second clamping device 9 includes a pull rod 9-1 and a clamping plate 9-2, the clamping plate 9-2 is arranged in the slot 5-1, the pull rod 9-1 is arranged vertically and its bottom end passes through the U-shaped hole 5-2 and is connected to the top surface of the clamping plate 9-2, and the top end of the pull rod 9-1 passes through the corresponding clamping through hole 3-1 and is fixed by a clamping nut 9-3. An external thread is provided on the outer wall of the upper section of the pull rod 9-1, and the clamping nut 9-3 is threadedly connected to the external thread on the pull rod 9-1. The second clamping device 9 has a simple structure, is easy to operate, and has a low cost. The clamping nut 9-3 completes the tightening during the hot lamination process.

[0061] The arrangement of the card slot 5 - 1 and the U-shaped hole 5 - 2 saves space and can achieve clamping without adding an external clamping device, which is low-cost and will not affect the lower mold 6 .

[0062] Furthermore, the horizontal cross-sectional area of ​​the clamping groove 5-1 is larger than the horizontal cross-sectional area of ​​the U-shaped hole 5-2, which serves to limit the clamping plate 9-2 and prevent the clamping plate 9-2 from falling off during the fastening process.

[0063] Furthermore, the first clamping device 8 includes a pressure cover 8-1 and a lifting eye bolt 8-2; the pressure cover 8-1 is a cylindrical body with an opening at the bottom, the pressure cover 8-1 is coaxially covered on the top of the dummy shaft 2, and the bottom edge of the pressure cover 8-1 is pressed on the top surface of the rotor core 1, a first threaded hole 2-2-1 is provided in the middle of the dummy shaft upper cover 2-2, a second threaded hole 8-1-1 is provided at a position opposite to the top surface of the pressure cover 8-1 and the first threaded hole 2-2-1, and the lower end of the lifting eye bolt 8-2 passes through the second threaded hole 8-1-1 and is matched and connected with the first threaded hole 2-2-1. The first clamping device 8 presses the rotor core 1 with the pressure cover 8-1 by tightening the lifting eye bolt 8-2.

[0064] Further, two sets of lifting rings 3-2 are arranged on the top surface of the upper pad 3. The arrangement of the lifting rings 3-2 facilitates lifting and transportation.

[0065] Furthermore, a first through hole 2-1-1 is vertically arranged in the middle of the shaft body 2-1, and an annular groove 2-1-2 is coaxially arranged at the bottom end of the first through hole 2-1-1, and the inner diameter of the annular groove 2-1-2 is larger than the inner diameter of the first through hole 2-1-1;

[0066] The dummy 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 and 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 platform 2-3-3 matching 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 the outer diameter of the shaft body 2-1, and a second through hole 2-3-4 is arranged in the middle of the dummy shaft lower cover 2-3 in the vertical direction;

[0067] The diverter 7 is a cylindrical structure, and a cover plate placement groove 7-1 matching the circular cover plate 2-3-1 is provided in the middle of the top surface of the diverter 7, a cylindrical protrusion 7-2 is coaxially provided at the center of the cover plate placement groove 7-1, the cylindrical protrusion 7-2 extends into the second through hole 2-3-4 and the circular cover plate 2-3-1 is arranged in the cover plate placement groove 7-1, and a downwardly raised arc protrusion 7-3 is provided at the center of the bottom surface of the diverter 7. The provision of the arc protrusion 7-3 makes the diversion of the aluminum liquid more uniform and improves the quality of the casting.

[0068] Furthermore, there is clearance fit between the cylindrical protrusion 7-2 and the second through hole 2-3-4, and between the cover plate placement groove 7-1 and the circular cover plate. The clearance fit between the diverter 7 and the dummy shaft lower cover 2-3 facilitates both installation and disassembly.

[0069] Furthermore, chamfers are provided at the outer edge of the bottom surface of the circular cover plate 2-3-1, the outer edge of the bottom surface of the diverter 7, the bottom surface edge of the cover plate placement groove 7-1 and the bottom surface edge of the second through hole 2-3-4.

Claims

1. A low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure. The tooth strip of the special end plate is located between two grooves. Features: The following steps are involved: 1) Cold lamination: stacking a plurality of rotor punching sheets on a dummy shaft (2) in sequence, placing the stacked rotor punching sheet group into a hydraulic press for lamination to form a rotor core (1), wherein the tonnage of the hydraulic press is 30-50 tons, and the lamination pressure applied by the hydraulic press is 2.5-3.0 MPa. After lamination until the rotor core (1) reaches a first specified length, the rotor core (1) is fastened with a gland (8-1) and eye bolts (8-2) of a first clamping device (8); 2) Heating the rotor core: sending the rotor core (1) laminated in step 1) to a heating furnace for heating, heating the rotor core (1) at a heating rate of 70-90°C / h for 1 hour, then keeping the temperature for 1 hour, then heating it at a heating rate of 70-90°C / h for 1 hour, then keeping the temperature for 1 hour, and finally heating it at a heating rate of 80-100°C / h for 1 hour, then keeping the temperature for 5 hours; 3) Preparation process: After the lower pad (5) and the lower die (6) are connected, they are placed on the hydraulic press in step 1), and the flow divider (7) is placed, and the pull rod (9-1) and the clamping plate (9-2) are ready; 4) Hot lamination: The rotor core heated in step 2) is lifted out of the heating furnace and placed on the lower die placed in step 3), and then the upper blade assembly is placed on the rotor core (1). At the same time, the clamping through hole (3-1) on the upper pad (3) passes through the upper end of the tie rod (9-1), and is initially tightened using the clamping nut (9-3). The hydraulic press in step 3) is started to continue laminating the rotor core (1). After reaching the second specified length, the clamping nut (9-3) is tightened again. 5) Low-pressure pouring: The mold fastened in step 4) is quickly lifted to the low-pressure aluminum casting machine for aluminum casting. The aluminum casting process parameters are carried out according to the set low-pressure aluminum casting curve; The mold comprises an upper blade profile assembly, a lower blade profile assembly, a rotor core (1) and a dummy shaft (2); the upper blade profile assembly comprises an upper pad (3) and an upper mold (4); the lower blade profile assembly comprises a lower pad (5) and a lower mold (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); a flow divider (7) is arranged between the dummy shaft (2) and the lower mold (6); the mold further comprises a first pressing device (8) and four sets of second pressing devices (9); the first pressing device (8) is arranged on the top of the dummy shaft (2) to press the middle part of the rotor core (1); Horizontal slots (5-1) are respectively arranged in the middle of the four corners of the lower pad (5), a U-shaped hole (5-2) is arranged on the lower pad (5) above the slot (5-1), the opening of the U-shaped hole (5-2) faces outward, and a clamping through hole (3-1) is arranged at a position corresponding to the U-shaped hole (5-2) on the upper pad (3); the second clamping device (9) comprises a pull rod (9-1) and a clamping plate (9-2), the clamping plate (9-2) is arranged in the slot (5-1), the pull rod (9-1) is arranged vertically and its bottom end passes through the U-shaped hole (5-2) and is connected to the top surface of the clamping plate (9-2), and the top end of the pull rod (9-1) passes through the corresponding clamping through hole (3-1) and is fixed by a clamping nut (9-3).

2. According to claim 1, a low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure, Features: The burr of the rotor punching sheet is less than 0.05 mm.

3. The low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure according to claim 1, Features: The second specified length of the rotor core in hot lamination=the first specified length of the rotor core in cold lamination×1.

013.

4. The low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure according to claim 1, Features: The area of ​​the horizontal cross section of the clamping groove (5-1) is greater than the area of ​​the horizontal cross section of the U-shaped hole (5-2).

5. The low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure according to claim 1, Features: The first clamping device (8) comprises a pressure cover (8-1) and a lifting eye bolt (8-2); the pressure cover (8-1) is a cylindrical body with an opening at the bottom, the pressure cover (8-1) is coaxially covered on the top of the dummy shaft (2), and the bottom edge of the pressure cover (8-1) is pressed on the top surface of the rotor core (1), a first threaded hole (2-2-1) is provided in the middle of the dummy shaft upper cover (2-2), a second threaded hole (8-1-1) is provided at a position opposite to the first threaded hole (2-2-1) on the top surface of the pressure cover (8-1), and the lower end of the lifting eye bolt (8-2) passes through the second threaded hole (8-1-1) and is matched and connected with the first threaded hole (2-2-1).

6. The low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure according to claim 1, Features: Two groups of lifting rings (3-2) are provided on the top surface of the upper pad (3).

7. The low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure according to claim 1, Features: A first through hole (2-1-1) is vertically arranged in the middle of the shaft body (2-1), an annular groove (2-1-2) is coaxially arranged at the bottom end of the first through hole (2-1-1), and the inner diameter of the annular groove (2-1-2) is larger than the inner diameter of the first through hole (2-1-1); The dummy 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 portion of the cover body (2-3-2) extends into the first through hole (2-1-1) and 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 platform (2-3-3) matching the annular clamping groove (2-1-2) is arranged on the lower outer wall of the cover body (2-3-2); the outer diameter of the circular cover plate (2-3-1) is larger than the outer diameter of the shaft body (2-1); and a second through hole (2-3-4) is arranged in the middle of the dummy shaft lower cover (2-3) in the vertical direction; The flow divider (7) is a cylindrical structure; a cover plate placement groove (7-1) matching the circular cover plate (2-3-1) is provided in the middle of the top surface of the flow divider (7); a cylindrical protrusion (7-2) is coaxially provided at the center of the cover plate placement groove (7-1); the cylindrical protrusion (7-2) extends into the second through hole (2-3-4) and the circular cover plate (2-3-1) is arranged in the cover plate placement groove (7-1); and a circular arc protrusion (7-3) that bulges downward is provided at the center of the bottom surface of the flow divider (7).

8. The low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure according to claim 7, Features: There is a clearance fit between the cylindrical protrusion (7-2) and the second through hole (2-3-4), and between the cover plate placement groove (7-1) and the circular cover plate.

9. The low-pressure aluminum casting process for a cast aluminum rotor with a special end plate structure according to claim 7, Features: Chamfers are provided at the outer edge of the bottom surface of the circular cover plate (2-3-1), the outer edge of the bottom surface of the diverter (7), the bottom surface edge of the cover plate placement groove (7-1) and the bottom surface edge of the second through hole (2-3-4).

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