A lamination and pressing device for motor rotor sheet

Abstract

The application provides a laminated sheet and pressing device for motor rotor sheet, comprising 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 for being connected with a heating component; the lower pressing plate is arranged on the upper part of the bottom; the two guide pins are used for realizing the pressing positioning of the upper pressing plate and the lower pressing plate; the cross section of each positioning pin is irregular triangle; the lower end of each positioning pin is arranged in a first through hole, the upper end is arranged in a third through hole, and the middle part is used for sleeving the motor rotor sheet, so that the motor rotor sheet forms a laminated sheet; 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 a pressing component; after the laminated sheet is formed, downward pressure is applied to the upper pressing plate until the upper pressing plate contacts with the limiting ring, so that the laminated sheet is pressed; and then the upper pressing plate and the lower pressing plate are heated, so that the laminated sheet is heated. The application can solve the problems of cracking and displacement in the production process of motor rotor magnetic ring.

Description

Technical Field

[0001] This invention relates to the field of special processing technology, and in particular to a lamination and pressing device for motor rotor laminations. Background Technology

[0002] In inertial control products, the motor rotor magnetic ring is a crucial component of the motor, and its machining quality significantly impacts the motor's normal starting and operation. The motor rotor magnetic ring is composed of a set of motor rotor laminations bonded together. The common thickness of these laminations does not exceed 0.60mm. After the laminations are coated with adhesive on both sides, they are stacked—that is, a set of laminations are assembled onto locating pins and then pressed into a motor rotor magnetic ring blank. Finally, the outer diameter, inner hole, and end faces of the blank are ground to meet the dimensional and positional accuracy requirements. Poor consistency in the stacked dimensions of the rotor laminations, out-of-tolerance dimensions of the pressed motor rotor magnetic ring blank, and insufficient bonding strength at the adhesive surfaces can lead to problems such as cracking and misalignment of the rotor laminations during grinding. Therefore, the stacking and pressing of the rotor laminations are critical steps in ensuring the machining quality of the motor rotor magnetic ring. Summary of the Invention

[0003] This invention provides a lamination and pressing device for motor rotor laminations, which can solve problems such as cracking and misalignment that occur during the production of motor rotor magnetic rings.

[0004] This invention provides a lamination and pressing device for motor rotor laminations, the device comprising a base plate, a lower pressure plate, two guide pins, several positioning pins, a limiting ring, and an upper pressure plate;

[0005] The base plate is used to connect to the heating element;

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

[0007] The two guide pins are used to achieve the pressing and positioning of the upper pressure plate and the lower pressure plate; the lower end of each guide pin is disposed in the second through hole and in contact with the bottom plate, and the upper end is frustum-shaped and disposed in the fourth through hole;

[0008] The cross-section of each positioning pin is an irregular triangle, and the three corners of the irregular triangle are rounded. The diameter of the outer tangent circle of each positioning pin is the same as the inner diameter of the motor rotor plate.

[0009] The lower end of each positioning pin is disposed in the first through hole, the upper end is disposed in the third through hole, and the middle part is used to fit the motor rotor plate so that the motor rotor plate forms a stack.

[0010] The limiting ring is disposed between the upper pressure plate and the lower pressure plate. The outer diameter of the limiting ring is not greater than the outer diameter of the lower pressure plate, and the inner diameter is greater than the outer tangent diameter of the two guide pins.

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

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

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

[0014] Preferably, the height of the frustum is 1 / 2 the thickness of the upper pressure plate.

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

[0017] Preferably, the outer diameter of the base plate is larger than the outer diameter of the lower pressure plate.

[0018] Preferably, the diameter of the first through hole is the same as the diameter of the inner hole of the motor rotor plate; the distance between the two second through holes is greater than the outer tangent circle diameter of a plurality of the first through holes.

[0019] Preferably, the guide pin has a clearance fit with the upper pressure plate and an interference fit with the lower pressure plate.

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

[0021] Preferably, the parallelism of the two end faces of the base plate, the lower pressure plate, the limiting ring, and the upper pressure plate is no greater than 0.01 mm.

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

[0023] 1. The positioning pins ensure the consistency of the radial dimensions of the motor rotor magnetic ring blank after the motor rotor laminations are stacked and pressed.

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

[0025] 3. The number of locating pins in the device can be adjusted according to the batch production quantity of the motor rotor blades to meet production needs;

[0026] 4. It can avoid defects such as cracking and misalignment after the motor rotor laminations are stacked and pressed, and ensure the processing dimensions and bonding quality of the motor rotor magnetic ring blank formed by stacking and pressing. Attached Figure Description

[0027] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0028] Figure 1a A three-dimensional structural schematic diagram of a lamination and pressing device for an electric motor rotor lamination according to an embodiment of the present invention is shown;

[0029] Figure 1b A top view of a lamination and pressing device for an electric motor rotor lamination according to an embodiment of the present invention is shown;

[0030] Figure 2a The main view of the base plate in the lamination and pressing device shown in Figure 1 is shown;

[0031] Figure 2b The figure shows a top view of the base plate in the lamination and pressing device in Figure 1;

[0032] Figure 3a A cross-sectional view of the lower pressure plate in the laminating and pressing device shown in Figure 1 is displayed;

[0033] Figure 3b A top view of the lower pressure plate in the laminating and pressing device shown in Figure 1 is displayed;

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

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

[0036] Figure 5a The front view of the locating pin in the lamination and pressing device of Figure 1 is shown;

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

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

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

[0040] Figure 7a A cross-sectional view of the upper pressure plate in the laminating and pressing device shown in Figure 1 is displayed;

[0041] Figure 7b A top view of the upper pressure plate in the laminating and pressing device shown in Figure 1 is displayed;

[0042] Figure 8a The main view of the assembly structure of the lower pressure plate and guide pin in the lamination and pressing device shown in Figure 1 is illustrated.

[0043] Figure 8b The top view of the assembly structure of the lower pressure plate and guide pin in the lamination and pressing device of Figure 1 is shown;

[0044] Figure 9a The main view of the assembly structure of the lower pressure plate, guide pin, and five positioning pins in the lamination and pressing device of Figure 1 is shown.

[0045] Figure 9b The top view shows the assembly structure of the lower pressure plate, guide pin, and five positioning pins in the lamination and pressing device of Figure 1.

[0046] Figure 10a The main view of the assembly structure of the lower pressure plate, guide pin, and two positioning pins in the lamination and pressing device of Figure 1 is shown.

[0047] Figure 10b The top view shows the assembly structure of the lower pressure plate, guide pin, and two positioning pins in the lamination and pressing device of Figure 1.

[0048] Figure 11a A half-sectional view of the assembly structure of the stacked lower pressure plate, positioning pin, and motor rotor laminations in the lamination and pressing device shown in Figure 1 is displayed.

[0049] Figure 11b The figure shows a top view of the stacked lower pressure plate, positioning pin, and motor rotor lamination assembly structure in the lamination and pressing device shown in Figure 1.

[0050] Figure 12 A schematic diagram of a motor rotor blank structure for pressing in a plastic press using a lamination and pressing device according to an embodiment of the present invention is shown.

[0051] Figure 13a It shows Figure 12 A cross-sectional view of the motor rotor magnetic ring blank;

[0052] Figure 13b It shows Figure 12 A top view of the motor rotor magnetic ring blank;

[0053] Figure 14a A cross-sectional view of the motor rotor blades in Figure 13 is shown;

[0054] Figure 14b A top view of the motor rotor blades in Figure 13 is shown.

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

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

[0057] 3. Motor rotor laminations; 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. Base plate 10. Lower pressure plate 11. Guide pin 12. Positioning pin

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

[0062] 16. Stacked capacitors 17. Capacitor paper

[0063] 18. Circumcircle of 4 stacked pieces 19. Circumcircle of 2 guide pins

[0064] 20. Lower heating plate of the plastic press 21. Upper heating plate of the plastic press Detailed Implementation

[0065] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0068] As shown in Figures 1-14, the present invention provides a lamination and pressing device for motor rotor laminations. The device includes a base plate 9, a lower pressing plate 10, two guide pins 11, several positioning pins 12, a limiting ring 13, and an upper pressing plate 14.

[0069] The base plate 9 is used to connect to the heating component;

[0070] The lower pressure plate 10 is disposed on the upper part of the bottom, and the lower pressure plate 10 has a plurality of first through holes 5 for placing the positioning pin 12 and two second through holes 6 for placing the guide pin 11.

[0071] The two guide pins 11 are used to press and position the upper pressure plate 14 and the lower pressure plate 10; the lower end of each guide pin 11 is disposed in the second through hole 6 and in contact with the bottom plate 9, and the upper end is frustum-shaped and disposed in the fourth through hole 8;

[0072] The cross-section of each positioning pin 12 is an irregular triangle, and the three corners of the irregular triangle are rounded. The diameter of the outer tangent circle of each positioning pin 12 is the same as the inner diameter of the motor rotor plate 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 part is used to sleeve the motor rotor plate 3 so that the motor rotor plate 3 forms a stack 16.

[0074] The limiting ring 13 is disposed between the upper pressure plate 14 and the lower pressure plate 10. The outer diameter of the limiting ring 13 is not greater than the outer diameter of the lower pressure plate 10, and the inner diameter is greater than the outer tangent circle 19 diameter of the two guide pins.

[0075] The upper pressure plate 14 is used to connect with the heating component and the pressurizing component; the upper pressure plate 14 has a plurality of third through holes 7 for placing the positioning pin 12 and two fourth through holes 8 for placing the guide pin 11, the positions of the plurality of third through holes 7 correspond one-to-one with the positions of the plurality of first through holes 5, and the positions of the two fourth through holes 8 correspond one-to-one with the positions of the two second through holes 6.

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

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

[0078] 1. The positioning pin 12 ensures the consistency of the radial dimensions of the motor rotor magnetic ring blank 4 after the motor rotor plates 3 are stacked and pressed.

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

[0080] 3. The production requirements can be met by adjusting the number of positioning pins 12 in the device according to the batch production quantity of motor rotor blades 3;

[0081] 4. It can avoid defects such as cracking and misalignment after the motor rotor plates 3 are stacked and pressed, and ensure the processing dimensions and bonding quality of the motor rotor magnetic ring blank 4 formed by stacking and pressing.

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

[0083] According to one embodiment of the present invention, as shown in FIG2, the base plate 9 is a support plate of the lamination and pressing device, and the bottom surface directly contacts the lower heating plate 20 of the plastic press. The parallelism of the two end faces is not greater than 0.01mm, so as to avoid deformation during pressing, which would result in inconsistent height of the motor rotor magnetic ring blank 4 after pressing. In order to facilitate installation and relocation, the outer diameter of the base plate 9 should be greater than the outer diameter of the lower pressure plate 10.

[0084] According to one embodiment of the present invention, as shown in FIG3, the lower pressure plate 10 is the carrier of the lamination and pressing device. It is cylindrical in shape, with a parallelism of no more than 0.01 mm at both ends to prevent deformation during pressing, which would result in inconsistent heights of the motor rotor magnetic ring blank 4 after pressing. The diameter of the cylinder is determined by the outer diameter 2 of the motor rotor lamination, the thickness of the limiting ring 13, and the number of laminations 16. The diameter of the first through hole 5 is the same as the diameter of the inner hole 1 of the motor rotor lamination, and it is clearance-fitted with the positioning pin 12. As shown in FIG9, five first through holes 5 are designed. After the first through holes 5 are assembled with five positioning pins 12, the distance between them should facilitate the lamination process. Simultaneously, the distance between adjacent laminations 16 after lamination should facilitate the removal of the positioning pins 12 attached to the pressed motor rotor magnetic ring blank 4. The distance between two second through holes 6 is greater than the outer tangent diameter of several first through holes 5. The second through holes 6 are interference-fitted with the guide pin 11 to facilitate placement and removal, avoid interference, and ensure accurate positioning.

[0085] According to one embodiment of the present invention, as shown in FIG. 4, guide pins 11 are used for pressing and positioning the upper pressure plate 14 and the lower pressure plate 10 to ensure that the upper pressure plate 14 is pressed vertically down by the pressure of the plastic press. The guide pins 11 are interference-fitted with the second through hole 6 of the lower pressure plate 10, as shown in FIG. 8, with the two guide pins 11 pressed into the second through hole 6 of the lower pressure plate 10 to the upper surface of the base plate 9. The length of the guide pins 11 is the sum of the thickness of the lower pressure plate 10, the height of the motor rotor magnetic ring blank 4, and 3 / 4 of the thickness of the upper pressure plate 14. To facilitate guidance, the pressing end of the upper pressure plate 14 is designed in the shape of a frustum, and the height of the frustum is 1 / 2 the thickness of the upper pressure plate 14.

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

[0087] According to one embodiment of the present invention, as shown in FIG6, the limiting ring 13 is used to ensure that the height of the motor rotor magnetic ring blank 4 after pressing is such that the parallelism of the two end faces is not greater than 0.01mm. The height of the limiting 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 laminate 16.

[0088] According to one embodiment of the present invention, as shown in FIG. 7, the upper surface of the upper pressure plate 14 contacts the upper heating plate 21 of the plastic press. The pressure of the plastic press is applied to the device through this surface. The parallelism of the two end faces is no more than 0.01mm to prevent deformation during pressing, which would result in inconsistent heights of the motor rotor magnetic ring blank 4 after pressing, and also to ensure uniform pressure on the device. The upper pressure plate 14 and the lower pressure plate 10 have the same shape and size. The third through hole 7 is machined to fit the first through hole 5, with the same size and opposite position, and is clearance-fitted with the positioning pin 12; the fourth through hole 8 is machined to fit the second through hole 6, with the same size and opposite position, and is clearance-fitted 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 limiting ring 13 and the upper pressure plate 14 can be made of carbon steel or alloy steel. The guide pin 11 and the positioning pin 12 have a hardness greater than HRC40, and the rigidity of each part in the device should be good.

[0090] To gain a further understanding of the present invention, the following detailed description of the use process of the lamination and pressing device for the motor rotor laminations of the present invention, with reference to Figures 1-14, will be provided.

[0091] Before stacking and pressing, check the parallelism of the upper heating plate 21 and lower heating plate 20 within their working ranges. The motor rotor plates 3 should be free from deformation, adhesion, or other problems. Clean the stacking and pressing device with gasoline and let it dry. Place the base plate 9 on the work platform. As shown in Figure 1, place the assembly of the lower pressure plate 10 and guide pin 11 (shown in Figure 8) on the base plate 9. Insert the five positioning pins 12 into the first through hole 5 of the lower pressure plate 10, with the insertion depth reaching the upper surface of the base plate 9.

[0092] Based on the range of the number of stacked motor rotor plates 3 specified in the technical requirements and the thickness of the adhesive layer between the plates after pressing, combined with the height of the motor rotor magnetic ring blank 4 and the measured value of the thickness of the motor rotor plate 3 before adhesive spraying, the number of stacked motor rotor plates 3 is determined.

[0093] According to the determined number of motor rotor plates 3 after stacking, and as shown in Figure 11, stack the motor rotor plates 3 onto the positioning pins 12 (Note: a capacitor paper 17 should be added to each end face of the contact device of the motor rotor plates 3) to form a stack 16. Then, press the upper pressure plate 14 along the guide pins 11 and positioning pins 12 (as shown in Figure 1) to fix the stack 16. Figure 12The device containing the stacked plates 16 is placed on the lower heating plate 20 of the plastic press. The plastic press is started, and the upper heating plate 21 is lowered onto the upper pressure plate 14. According to the process requirements, preheating is performed first, followed by pressurization (using a pressure gauge to control the required pressure), and then heat preservation and pressure holding. After the heat preservation and pressure holding are completed, the stacked plates and pressing device are removed. After the device cools down, the positioning pin 12 with the motor rotor magnetic ring blank 4 is removed, and then the motor rotor magnetic ring blank 4 is removed from the positioning pin 12. The capacitor paper 17 on both ends is removed, and it is handed over for inspection. (Note: The motor rotor magnetic ring blank 4 that has passed inspection can only be ground after 24 hours.)

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

[0095] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0096] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lamination and pressing device for motor rotor laminations, characterized in that, The device includes a base plate, a lower pressure plate, two guide pins, several positioning pins, a limiting ring, and an upper pressure plate; The base plate is used to connect to the heating element; The lower pressure plate is disposed on the upper part of the base plate, and the lower pressure plate has a plurality of first through holes for placing the positioning pin and two second through holes for placing the guide pin; The two guide pins are used to achieve the pressing and positioning of the upper pressure plate and the lower pressure plate; the lower end of each guide pin is disposed in the second through hole and in contact with the bottom plate, and the upper end is frustum-shaped and disposed in the fourth through hole; The cross-section of each positioning pin is an irregular triangle, and the three corners of the irregular triangle are rounded. The diameter of the outer tangent circle of each positioning pin is the same as the inner diameter of the motor rotor plate. The lower end of each positioning pin is disposed in the first through hole, the upper end is disposed in the third through hole, and the middle part is used to fit the motor rotor plate so that the motor rotor plate forms a stack. The limiting ring is disposed between the upper pressure plate and the lower pressure plate. The outer diameter of the limiting ring is not greater than the outer diameter of the lower pressure plate, and the inner diameter is greater than the outer tangent diameter of the two guide pins. The upper pressure plate is used to connect with the heating component and the pressurizing component; the upper pressure plate has a plurality of third through holes for placing the positioning pin and two fourth through holes for placing the guide pin, the positions of the plurality of third through holes correspond one-to-one with the positions of the plurality of first through holes, and the positions of the two fourth through holes correspond one-to-one with the positions of the two second through holes; After the stacked sheets are formed, downward pressure is applied to the upper pressure plate until the upper pressure plate contacts the limiting ring, thereby pressurizing the stacked sheets; then the upper pressure plate and the lower pressure plate are heated, thereby heating the stacked sheets.

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

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

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

5. The apparatus 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 laminate.

6. The apparatus according to claim 1, characterized in that, The outer diameter of the base plate is larger than the outer diameter of the lower pressure plate.

7. The apparatus according to claim 1, characterized in that, The diameter of the first through hole is the same as the diameter of the inner hole of the motor rotor plate; the distance between the two second through holes is greater than the outer tangent circle diameter of several first through holes.

8. The apparatus according to claim 1, characterized in that, The guide pin has a clearance fit with the upper pressure plate and an interference fit with the lower pressure plate.

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

10. The apparatus according to any one of claims 1-9, characterized in that, The parallelism of the two end faces of the base plate, the lower pressure plate, the limiting ring, and the upper pressure plate shall not exceed 0.01 mm.

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