Laminating and pressing device for motor rotor sheets

Abstract

The invention provides a lamination and pressing device for motor rotor sheets. The lamination and pressing device comprises a bottom plate, a lower pressing plate, two guide pins, a plurality of positioning pins, a limiting ring and an upper pressing plate, the bottom plate is connected with a heating component; the lower pressing plate is arranged at the upper part of the bottom; the two guide pins are used for realizing press fit positioning of the upper pressing plate and the lower pressing plate; the cross section of each positioning pin is in an irregular triangle shape; the lower end of each positioning pin is arranged in the first through hole, the upper end of each positioning pin is arranged in the third through hole, and the middle of each positioning pin is used for sleeving a motor rotor sheet so that the motor rotor sheets form a lamination; the limiting ring is arranged between the upper pressing plate and the lower pressing plate; the upper pressing plate is used for being connected with the heating component and the pressurizing component. After the lamination is formed, downward pressure is applied to the upper pressing plate until the upper pressing plate is in contact with the limiting ring, so that the lamination is pressurized; and then the upper pressing plate and the lower pressing plate are heated, so that the heating of the lamination is realized. The problems of cracking, shifting and the like in the production process of the motor rotor magnetic ring can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of special processing, and in particular to a lamination and pressing device for motor rotor sheets. Background Art

[0002] In inertial control products, the motor rotor magnetic ring is an important part of the motor. The processing quality of the motor rotor magnetic ring is an important factor affecting whether the motor can start and work normally. The motor rotor magnetic ring is made of a group of motor rotor sheets glued together. The common thickness of the motor rotor sheet does not exceed 0.60mm. After the motor rotor sheet is sprayed with glue on both sides, it needs to be stacked, that is, a group of motor rotor sheets are assembled on the positioning pins, and then pressed into the motor rotor magnetic ring blank, and finally the outer circle, inner hole and end face of the motor rotor magnetic ring blank are ground to meet the size and shape and position accuracy requirements of the motor rotor magnetic ring. If the size consistency of the motor rotor sheet stacking is poor, the size of the motor rotor magnetic ring blank after pressing is out of tolerance, and the bonding force of the glued surface is insufficient, the motor rotor sheet will crack and shift when grinding the motor rotor magnetic ring blank. Therefore, the stacking and pressing of the motor rotor sheet are important links to ensure the processing quality of the motor rotor magnetic ring. Summary of the invention

[0003] The present invention provides a lamination and pressing device for a motor rotor sheet, which can solve the problems of cracking, misalignment and the like that may occur during the production process of a motor rotor magnetic ring.

[0004] The present invention provides a lamination and pressing device for a motor rotor sheet, the device comprising a bottom plate, a lower pressing plate, two guide pins, a plurality of positioning pins, a limiting ring and an upper pressing plate;

[0005] The bottom plate is used to be connected to the heating component;

[0006] The lower pressing plate is arranged on the upper part of the bottom, and has a plurality of first through holes for placing the positioning pins and two second through holes for placing the guide pins;

[0007] The two guide pins are used to realize the pressing and positioning of the upper pressing plate and the lower pressing plate; the lower end of each guide pin is arranged in the second through hole and contacts the bottom plate, and the upper end is truncated cone-shaped and arranged in the fourth through hole;

[0008] The cross section of each positioning pin is an irregular triangle, the three corners of the irregular triangle are in an arc-shaped transition, and the diameter of the circumscribed circle of each positioning pin is the same as the inner hole diameter of the motor rotor sheet;

[0009] The lower end of each positioning pin is arranged in the first through hole, the upper end is arranged in the third through hole, and the middle part is used for sleeve-mounting the motor rotor sheet, so that the motor rotor sheet forms a stack;

[0010] The limiting ring is arranged between the upper pressing plate and the lower pressing plate, the outer diameter of the limiting ring is not larger than the outer diameter of the lower pressing plate and the inner hole diameter is larger than the circumscribed circle diameters of the two guide pins;

[0011] The upper pressing plate is used to be connected with the heating component and the pressing component; the upper pressing plate has a plurality of third through holes for placing the positioning pins and two fourth through holes for placing the guide pins, the positions of the plurality of third through holes correspond one-to-one to the positions of the plurality of first through holes, and the positions of the two fourth through holes correspond one-to-one to the positions of the two second through holes;

[0012] After the lamination is formed, downward pressure is applied to the upper pressing plate until the upper pressing plate contacts the limiting ring, thereby pressurizing the lamination; and then the upper pressing plate and the lower pressing plate are heated, thereby heating the lamination.

[0013] Preferably, the length of the guide pin is the sum of the thickness of the lower pressing plate, the height of the motor rotor magnetic ring blank, and 3 / 4 of the thickness of the upper pressing plate.

[0014] Preferably, the height of the truncated cone is 1 / 2 of the thickness of the upper pressing plate.

[0015] Preferably, the length of the positioning pin is the sum of the thickness of the lower pressing plate, the height of the motor rotor magnetic ring blank, and 1 / 4 of the thickness of the upper pressing plate.

[0016] Preferably, the height of the limiting ring is the sum of the height of the motor rotor magnetic ring blank and the thickness of the capacitor paper at both ends of the lamination.

[0017] Preferably, the outer diameter of the bottom plate is larger than the outer diameter of the lower pressing plate.

[0018] Preferably, the aperture of the first through hole is the same as the inner diameter of the motor rotor plate; and the distance between two of the second through holes is greater than the diameter of the circumscribed circles of a number of the first through holes.

[0019] Preferably, the guide pin is clearance fit with the upper pressing plate and interference fit with the lower pressing plate.

[0020] Preferably, the positioning pin is clearance-fitted with the upper pressing plate, the lower pressing plate and the motor rotor sheet.

[0021] Preferably, the parallelism of the two end surfaces of the bottom plate, the lower pressing plate, the limiting ring and the upper pressing plate is not greater than 0.01 mm.

[0022] The application of the technical solution of the present invention has the following beneficial effects:

[0023] 1. Through the positioning function of the positioning pin, the consistency of the radial dimensions of the motor rotor magnetic ring blank after the motor rotor sheets are stacked and pressed together is ensured;

[0024] 2. The limiting effect of the limiting ring ensures the consistency of the height size of the motor rotor magnetic ring blank after pressing;

[0025] 3. According to the batch production quantity of motor rotor sheets, the number of positioning pins in the device can be adjusted to meet production needs;

[0026] 4. It can avoid defects such as cracking and dislocation after the motor rotor sheets are stacked and pressed, and ensure the processing size and bonding quality of the motor rotor magnetic ring blanks formed by stacking and pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1a A schematic diagram of the three-dimensional structure of a lamination and pressing device of a motor rotor sheet provided in accordance with an embodiment of the present invention is shown;

[0029] Figure 1b A top view of a lamination and a pressing device of a motor rotor sheet provided in an embodiment of the present invention is shown;

[0030] Figure 2a A front view of the bottom plate in the lamination and pressing device of FIG. 1 is shown;

[0031] Figure 2b A top view of the bottom plate in the lamination and pressing device of FIG. 1 is shown;

[0032] Figure 3a A cross-sectional view of the lower pressing plate in the lamination and pressing device of FIG. 1 is shown;

[0033] Figure 3b A top view of the lower pressing plate in the lamination and pressing device of FIG. 1 is shown;

[0034] Figure 4a A front view of the guide pin in the lamination and pressing device of FIG. 1 is shown;

[0035] Figure 4b A top view of the guide pins in the lamination and pressing device of FIG. 1 is shown;

[0036] Figure 5a A front view of the positioning pin in the lamination and pressing device of FIG. 1 is shown;

[0037] Figure 5b A top view of the lamination and the positioning pin in the pressing device of FIG. 1 is shown;

[0038] Figure 6a A cross-sectional view of a stop ring in the lamination and pressing device of FIG. 1 is shown;

[0039] Figure 6b A top view of the lamination and the limiting ring in the pressing device of FIG. 1 is shown;

[0040] Figure 7a A cross-sectional view of the upper pressing plate in the lamination and pressing device of FIG. 1 is shown;

[0041] Figure 7b A top view of the upper pressing plate in the lamination and pressing device of FIG. 1 is shown;

[0042] Figure 8a A front view of the assembly structure of the lower pressing plate and the guide pins in the lamination and pressing device of FIG. 1 is shown;

[0043] Figure 8b A top view of the assembly structure of the lower pressing plate and the guide pins in the lamination and pressing device of FIG. 1 is shown;

[0044] Figure 9a A front view of the assembly structure of the lower pressing plate, guide pins and five positioning pins in the lamination and pressing device of FIG. 1 is shown;

[0045] Figure 9b A top view of the assembly structure of the lower pressing plate, guide pins and five positioning pins in the lamination and pressing device of FIG. 1 is shown;

[0046] Fig.10a A front view of the assembly structure of the lower pressing plate, the guide pins and the two positioning pins in the lamination and pressing device of FIG. 1 is shown;

[0047] Fig.10b A top view of the assembly structure of the lower pressing plate, the guide pins and the two positioning pins in the lamination and pressing device of FIG. 1 is shown;

[0048] Fig.11a A half-section view of the assembly structure of the lower pressing plate, the positioning pins, and the motor rotor sheet after lamination in the lamination and pressing device of FIG. 1 is shown;

[0049] Fig.11b A top view of the assembly structure of the lower pressing plate, the positioning pins, and the motor rotor sheet after lamination in the lamination and pressing device of FIG. 1 is shown;

[0050] Fig.12 A schematic diagram of the structure of pressing a motor rotor sheet blank in a plastic press using a lamination and a pressing device provided in an embodiment of the present invention is shown;

[0051] Fig.13a Shows Fig.12 A cross-sectional view of a motor rotor magnetic ring blank;

[0052] Fig.13b Shows Fig.12 A top view of the motor rotor magnetic ring blank;

[0053] Fig.14a A cross-sectional view of the motor rotor sheet in FIG13 is shown;

[0054] Fig.14b A top view of the motor rotor sheet is shown in FIG. 13 .

[0055] The above drawings include the following reference numerals:

[0056] 1. Inner hole of motor rotor plate 2. Outer circle of motor rotor plate

[0057] 3. Motor rotor sheet 4. Motor rotor magnetic ring blank

[0058] 5. First through hole 6. Second through hole

[0059] 7. Third through hole 8. Fourth through hole

[0060] 9. Bottom plate 10. Lower pressure plate 11. Guide pin 12. Positioning pin

[0061] 13. Limiting ring 14. Upper pressure plate

[0062] 16. Lamination 17. Capacitor paper

[0063] 18. 4 lamination circumscribed circles 19. 2 guide pin circumscribed circles

[0064] 20. Lower heating plate of plastic press 21. Upper heating plate of plastic press DETAILED DESCRIPTION

[0065] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0068] As shown in FIGS. 1 to 14 , the present invention provides a lamination and pressing device for a motor rotor sheet, the device comprising a bottom plate 9, a lower pressing plate 10, two guide pins 11, a plurality of positioning pins 12, a limiting ring 13 and an upper pressing plate 14;

[0069] The bottom plate 9 is used to be connected to the heating component;

[0070] The lower pressing plate 10 is arranged at the upper part of the bottom, and has a plurality of first through holes 5 for placing the positioning pins 12 and two second through holes 6 for placing the guide pins 11;

[0071] The two guide pins 11 are used to realize the pressing and positioning of the upper pressing plate 14 and the lower pressing plate 10; the lower end of each guide pin 11 is arranged in the second through hole 6 and contacts the bottom plate 9, and the upper end is truncated cone-shaped and arranged in the fourth through hole 8;

[0072] The cross section of each positioning pin 12 is an irregular triangle, the three corners of the irregular triangle are in an arc-shaped transition, and the diameter of the circumscribed circle of each positioning pin 12 is the same as the inner hole diameter of the motor rotor sheet 3;

[0073] The lower end of each positioning pin 12 is disposed in the first through hole 5, the upper end is disposed in the third through hole 7, and the middle portion is used to sleeve the motor rotor sheet 3, so that the motor rotor sheet 3 forms a stack 16;

[0074] The limiting ring 13 is arranged between the upper pressing plate 14 and the lower pressing plate 10, the outer diameter of the limiting ring 13 is not greater than the outer diameter of the lower pressing plate 10 and the inner diameter is greater than the diameter of the circumscribed circle 19 of the two guide pins;

[0075] The upper pressing plate 14 is used to be connected with the heating component and the pressing component; the upper pressing plate 14 has a plurality of third through holes 7 for placing the positioning pins 12 and two fourth through holes 8 for placing the guide pins 11, the positions of the plurality of third through holes 7 correspond to the positions of the plurality of first through holes 5, and the positions of the two fourth through holes 8 correspond to the positions of the two second through holes 6;

[0076] After the lamination 16 is formed, downward pressure is applied to the upper pressing plate 14 until the upper pressing plate 14 contacts the limiting ring 13 , thereby pressurizing the lamination 16 ; and then the upper pressing plate 14 and the lower pressing plate 10 are heated, thereby heating the lamination 16 .

[0077] The present invention has the following beneficial effects:

[0078] 1. Through the positioning function of the positioning pin 12, the consistency of the radial dimensions of the motor rotor magnetic ring blank 4 after the motor rotor sheets 3 are stacked and pressed together is ensured;

[0079] 2. The limiting effect of the limiting ring 13 ensures the consistency of the height dimension of the motor rotor magnetic ring blank 4 after pressing;

[0080] 3. According to the batch production quantity of the motor rotor sheet 3, the number of positioning pins 12 in the device can be adjusted to meet the production demand;

[0081] 4. It can avoid defects such as cracking and dislocation of the motor rotor sheets 3 after lamination and pressing, and ensure the processing size and bonding quality of the motor rotor magnetic ring blank 4 formed by lamination and pressing.

[0082] In the present invention, the design of the device is based on the diameter of the inner hole 1 of the motor rotor sheet, the outer diameter of the outer circle 2 of the motor rotor sheet, the height of the motor rotor magnetic ring blank 4 (as shown in Figures 13-14) and the batch production quantity.

[0083] According to an embodiment of the present invention, as shown in Figure 2, the bottom plate 9 is a support plate for the lamination and pressing device, the bottom surface directly contacts the lower heating plate 20 of the plastic press, and the parallelism of the two end surfaces is not greater than 0.01 mm to avoid deformation during pressing, resulting in inconsistent height of the motor rotor magnetic ring blank 4 after pressing; in order to facilitate installation and movement, the outer diameter of the bottom plate 9 should be larger than the outer diameter of the lower pressing plate 10.

[0084] According to an embodiment of the present invention, as shown in FIG3 , the lower pressing plate 10 is a carrier of the lamination and the pressing device, and has a cylindrical shape, and the parallelism of the two end surfaces is not greater than 0.01 mm, so as to avoid deformation during pressing, resulting in inconsistent height of the motor rotor magnetic ring blank 4 after pressing; the diameter of the cylinder is determined by the diameter of the outer circle 2 of the motor rotor sheet, the thickness of the limit ring 13 and the number of laminations 16. The aperture of the first through hole 5 is the same as the diameter of the inner hole 1 of the motor rotor sheet, and is clearance-matched with the positioning pin 12. As shown in FIG9 , five first through holes 5 are designed. After the first through holes 5 and the five positioning pins 12 are assembled, the distance between them should meet the convenience of the lamination process, and at the same time, the distance between adjacent laminations 16 after lamination should be met to facilitate the removal of the positioning pin 12 attached to the motor rotor magnetic ring blank 4 after pressing. The hole spacing between two of the second through holes 6 is greater than the diameter of the circumscribed circle of several of the first through holes 5. The second through hole 6 is interference-fitted with the guide pin 11 to facilitate taking and placing, avoid interference, and accurately position.

[0085] According to one embodiment of the present invention, as shown in FIG4 , the guide pin 11 is used for pressing and positioning the upper pressing plate 14 and the lower pressing plate 10 to ensure that the upper pressing plate 14 is pressed vertically by the pressure of the plastic press. The guide pin 11 is interference fit with the second through hole 6 of the lower pressing plate 10. As shown in FIG8 , the two guide pins 11 are pressed into the second through hole 6 of the lower pressing plate 10, and the pressing depth reaches the upper surface of the bottom plate 9. The length of the guide pin 11 is the sum of the thickness of the lower pressing plate 10, the height of the motor rotor magnetic ring blank 4, and 3 / 4 of the thickness of the upper pressing plate 14. In order to facilitate guiding, the shape of the pressing end of the upper pressing plate 14 is designed to be a truncated cone, and the height of the truncated cone is 1 / 2 of the thickness of the upper pressing plate 14.

[0086] According to one embodiment of the present invention, as shown in FIG5 , the locating pin 12 is used to ensure the consistency of the radial dimension of the motor rotor magnetic ring blank 4, and the locating pin 12 is clearance-fitted with the upper pressing plate 14, the lower pressing plate 10 and the motor rotor sheet 3. The number of locating pins 12 is determined by the batch production quantity of the motor rotor magnetic ring. As shown in FIG9 , 5 locating pins 12 are used, and FIG10 uses 2 locating pins 12. The length of the locating pin 12 is the sum of the thickness of the lower pressing plate 10, the height of the motor rotor magnetic ring blank 4, and 1 / 4 of the thickness of the upper pressing plate 14. Since there will be glue overflow when the motor rotor sheet 3 is pressed together, in order to facilitate the removal of the locating pin 12 after pressing together, the shape of the locating pin 12 is designed to be an irregular triangle. On the other hand, the diameter of the locating pin 12 is the same as the basic size of the inner hole 1 of the motor rotor sheet. This structure also facilitates the overlapping operation of the motor rotor sheet 3.

[0087] According to an embodiment of the present invention, as shown in Figure 6, the limit ring 13 is used to ensure the height of the motor rotor magnetic ring blank 4 after pressing, and the parallelism of the two end surfaces is not greater than 0.01mm. The height of the limit ring 13 is the sum of the height of the motor rotor magnetic ring blank 4 and the thickness of the capacitor paper 17 at both ends of the lamination 16.

[0088] According to an embodiment of the present invention, as shown in FIG7 , the upper surface of the upper pressing plate 14 contacts the upper heating plate 21 of the plastic press, and the pressure of the plastic press acts on the device through the surface. The parallelism of the two end surfaces is not greater than 0.01 mm to avoid deformation during pressing, resulting in inconsistent height of the motor rotor magnetic ring blank 4 after pressing, and also ensure that the device is pressed evenly. The upper pressing plate 14 and the lower pressing plate 10 have the same shape, structure and size. The third through hole 7 is processed in coordination with the first through hole 5, has the same size, is in relative position, and is in clearance with the positioning pin 12; the fourth through hole 8 is processed in coordination with the second through hole 6, has the same size, is in relative position, and is in clearance with the guide pin 11.

[0089] According to one embodiment of the present invention, the base plate 9, the lower pressure plate 10, the guide pin 11, the positioning pin 12, the limit ring 13 and the upper pressure plate 14 can be made of carbon steel or alloy steel. The hardness of the guide pin 11 and the positioning pin 12 is greater than HRC40, and the rigidity of each part in the device should be good.

[0090] In order to have a further understanding of the present invention, the lamination and use process of the pressing device for the motor rotor sheet of the present invention will be described in detail below with reference to FIGS. 1 to 14 .

[0091] Before lamination and pressing, check the parallelism of the upper heating plate 21 and the lower heating plate 20 of the plastic press within the working range, and the motor rotor plate 3 should not be deformed or adhered. Clean the lamination and pressing device with gasoline and dry them, put the bottom plate 9 on the working platform; according to Figure 1, put the assembly of the lower pressing plate 10 and the guide pins 11 (shown in Figure 8) on the bottom plate 9; install five positioning pins 12 into the first through hole 5 of the lower pressing plate 10, and the installation depth reaches the upper surface of the bottom plate 9.

[0092] According to the range of the number of laminated motor rotor sheets 3 and the thickness of the glue layer between the sheets after pressing as specified in the technical requirements, combined with the height of the motor rotor magnetic ring blank 4 and the measured thickness of the motor rotor sheet 3 before spraying glue, the number of motor rotor sheets 3 after lamination is determined.

[0093] According to the number of motor rotor sheets 3 after stacking, stack the motor rotor sheets 3 onto the positioning pins 12 according to Figure 11 (Note: a capacitor paper 17 should be added to each of the two end surfaces of the contact device of the motor rotor sheet 3) to form a stack 16, and then press the upper pressing plate 14 along the guide pins 11 and the positioning pins 12 (as shown in Figure 1) to fix the stack 16. Fig.12, place the device with the stack 16 on the lower heating plate 20 of the plastic press, start the plastic press and drop the upper heating plate 21 onto the upper pressing plate 14. According to the process requirements, preheat first, then pressurize (use a barometer to control the required pressure), and then keep warm and keep pressure. After the insulation and pressure are completed, take out the stack and the pressing device. After the device cools down, remove the positioning pin 12 with the motor rotor magnetic ring blank 4, then remove the motor rotor magnetic ring blank 4 from the positioning pin 12, remove the capacitor paper 17 on the two end surfaces, and submit for inspection. (Note: The motor rotor magnetic ring blank 4 that has passed the inspection can only be ground after 24 hours.)

[0094] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0095] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lamination and pressing device for motor rotor sheets, characterized in that: The device comprises a bottom plate, a lower pressing plate, two guide pins, a plurality of positioning pins, a limiting ring and an upper pressing plate; The bottom plate is used to be connected to the heating component; The lower pressing plate is arranged on the upper part of the bottom, and has a plurality of first through holes for placing the positioning pins and two second through holes for placing the guide pins; The two guide pins are used to realize the pressing and positioning of the upper pressing plate and the lower pressing plate; the lower end of each guide pin is arranged in the second through hole and contacts the bottom plate, and the upper end is truncated cone-shaped and arranged in the fourth through hole; The cross section of each positioning pin is an irregular triangle, the three corners of the irregular triangle are in an arc-shaped transition, and the diameter of the circumscribed circle of each positioning pin is the same as the inner hole diameter of the motor rotor sheet; The lower end of each positioning pin is arranged in the first through hole, the upper end is arranged in the third through hole, and the middle part is used for sleeve-mounting the motor rotor sheet, so that the motor rotor sheet forms a stack; The limiting ring is arranged between the upper pressing plate and the lower pressing plate, the outer diameter of the limiting ring is not larger than the outer diameter of the lower pressing plate and the inner hole diameter is larger than the circumscribed circle diameters of the two guide pins; The upper pressing plate is used to be connected with the heating component and the pressing component; the upper pressing plate has a plurality of third through holes for placing the positioning pins and two fourth through holes for placing the guide pins, the positions of the plurality of third through holes correspond one-to-one to the positions of the plurality of first through holes, and the positions of the two fourth through holes correspond one-to-one to the positions of the two second through holes; After the lamination is formed, downward pressure is applied to the upper pressing plate until the upper pressing plate contacts the limiting ring, thereby pressurizing the lamination; and then the upper pressing plate and the lower pressing plate are heated, thereby heating the lamination.

2. The device according to claim 1, characterized in that The length of the guide pin is the sum of the thickness of the lower pressing plate, the height of the motor rotor magnetic ring blank, and 3 / 4 of the thickness of the upper pressing plate.

3. The device according to claim 1 or 2, characterized in that: The height of the truncated cone is 1 / 2 of the thickness of the upper pressing plate.

4. The device according to claim 1, characterized in that The length of the positioning pin is the sum of the thickness of the lower pressing plate, the height of the motor rotor magnetic ring blank, and 1 / 4 of the thickness of the upper pressing plate.

5. The device according to claim 1, characterized in that The height of the limiting ring is the sum of the height of the motor rotor magnetic ring blank and the thickness of the capacitor paper at both ends of the lamination.

6. The device according to claim 1, characterized in that The outer diameter of the bottom plate is larger than the outer diameter of the lower pressing plate.

7. The device according to claim 1, characterized in that The aperture of the first through hole is the same as the inner diameter of the motor rotor plate; the hole spacing between two of the second through holes is greater than the diameter of the circumscribed circles of a number of the first through holes.

8. The device according to claim 1, characterized in that The guide pin is clearance-fitted with the upper pressing plate and interference-fitted with the lower pressing plate.

9. The device according to claim 1, characterized in that The positioning pin is clearance-fitted with the upper pressing plate, the lower pressing plate and the motor rotor sheet.

10. The device according to any one of claims 1 to 9, characterized in that: The parallelism of the two end surfaces of the bottom plate, the lower pressing plate, the limiting ring and the upper pressing plate is not greater than 0.01 mm.

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