Automobile motor rotor cover closing riveting machine

Abstract

The present application relates to the technical field of automobile motor rotor cover closing and riveting, and aims to provide an automobile motor rotor cover closing and riveting machine. It comprises a bottom plate, a lower jig movable plate arranged on the upper end face of the bottom plate, a closing support jig fixedly arranged on the lower jig movable plate, a placing groove formed in the top of the closing support jig, an avoiding through hole formed in the groove bottom of the placing groove, a riveting jig fixedly arranged on the upper end face of the bottom plate and arranged on the inner side of the avoiding through hole, a rivet point boss fixedly arranged on the top of the riveting jig, a closing support plate arranged between the lower jig movable plate and the bottom plate, a lifting plate arranged above the bottom plate, and a closing jig fixedly connected with the lifting plate and having a closing pressing groove formed in the bottom thereof. The present application has the advantages of integrated closing and riveting functions, single clamping for completing double process machining, improved working continuity, machining efficiency and product quality.

Description

Technical Field

[0001] This invention relates to the technical field of riveting and sealing of automotive motor rotor covers, and in particular to a riveting and sealing machine for automotive motor rotor covers. Background Technology

[0002] In the manufacturing process of automotive permanent magnet synchronous motors, the rotor assembly typically requires a rotor cover to be fitted over the rotor core to protect the magnets. During assembly, the rotor cover needs to be tightened to prevent it from slipping off, and a riveting groove is applied to the lower end face to prevent the rotor cover from running in a ring shape during use.

[0003] Currently, the rotor cover finishing and riveting processes in existing technologies have the following technical problems: the finishing and riveting processes are separate, requiring two independent machines to complete them, resulting in poor work continuity. Existing equipment uses separate machines for both the finishing and riveting processes of the rotor cover, leading to low processing efficiency, time-consuming and labor-intensive operation, and coaxiality deviations due to multiple processing steps, affecting quality stability. The rotor needs to be finished on one side on the finishing machine before being transferred to the riveting machine for riveting the other side, resulting in low processing efficiency. Multiple clamping operations cause inconsistent positioning references, affecting the coaxiality accuracy of the rotor cover and rotor core.

[0004] In summary, there is a current need for an automotive motor rotor cover riveting machine that can improve work continuity, processing efficiency, and product quality. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and provide an automotive motor rotor cover riveting machine that can improve work continuity, processing efficiency and product quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A riveting machine for sealing the end of an automotive motor rotor cover, comprising: Base plate; The lower fixture movable plate is located on the upper end face of the base plate and slides vertically therewith. A constriction support fixture is fixed on the lower fixture movable plate. A placement groove is opened on the top of the constriction support fixture, and an avoidance through hole is provided through the bottom of the placement groove. A riveting fixture is fixedly mounted on the upper end face of the base plate and arranged inside the clearance through hole. The top of the riveting fixture is fixedly provided with a rivet boss and a positioning pin. The top of the rivet boss is flush with the bottom surface of the placement groove. A closing support plate is disposed between the lower fixture movable plate and the bottom plate and is horizontally slidably fitted thereto. A lifting plate, which is located above the base plate and is movable up and down relative to the base plate; A closing fixture is fixedly connected to a lifting plate and has a closing groove at its bottom. The closing groove and the placement groove are arranged vertically opposite each other. The groove wall of the closing groove is an inclined guide surface. The inclined guide surface slopes from the opening end of the closing groove to the bottom end towards the center of the closing groove. The groove wall and the bottom of the closing groove are connected by a rounded corner transition.

[0007] When the equipment is working, the rotor assembly is placed in the placement slot of the closing support fixture. Precise positioning is achieved by the positioning pin on the riveting fixture. The rivet boss is hidden in the clearance through hole and is flush with the bottom of the placement slot, so as not to affect the rotor placement and positioning. The closing support plate slides horizontally into place to form a support limit for the lower fixture movable plate. The lifting plate drives the closing fixture to move downward. Relying on the inclined guide surface of the closing pressure groove and the rounded corner transition structure, the upper end of the rotor cover is smoothly squeezed to complete the uniform closing. After the closing process is completed, the lifting plate first returns to its original position, and then the closing support plate moves horizontally to release the support limit. The lifting plate presses down again and drives the workpiece to move down synchronously with the lower fixture movable plate, so that the lower end face of the rotor cover abuts against the rivet boss of the riveting fixture. The two processes of rotor cover closing and end face riveting are completed in one continuous process. This invention integrates end-closing and riveting functions, enabling dual-process machining in a single clamping operation. The smooth and compact process transitions improve work continuity, processing efficiency, and product quality. It solves the problems of separate end-closing and riveting processes in traditional technologies, which require multiple clamping operations leading to coaxiality deviations. The entire riveting process can be completed in a single clamping operation, avoiding cumulative errors from multiple positioning steps. This ensures the coaxiality accuracy of the rotor cover and rotor core, achieving automated continuous operation of rotor cover end-closing and riveting. Operators only need to perform loading and unloading operations; the equipment automatically completes both end-closing and riveting processes. Compared to the traditional method of processing with two separate machines, the processing cycle time for a single piece is significantly shortened, while also reducing equipment footprint and the number of operators. Combined with a precise positioning structure and a guiding end-closing structure, it effectively improves processing coaxiality and forming uniformity, eliminating problems such as uneven end-closing and riveting point misalignment, significantly improving product processing accuracy and production stability.

[0008] Preferably, a top plate is provided above the lifting plate, and the top plate and the bottom plate are fixedly connected. A servo electric cylinder is fixedly mounted on the top plate, and a pressure sensor is fixedly mounted on the lifting plate. The telescopic end of the servo electric cylinder is fixedly mounted on the pressure sensor. The servo electric cylinder is installed on the top plate and drives the lifting plate to move through the pressure sensor. The servo electric cylinder can accurately control the output speed and stroke. The pressure sensor collects the pressing force signal during the processing in real time and feeds it back to the control system, realizing real-time monitoring of the pressure in the closing and riveting processes. Using a servo electric cylinder instead of a traditional pneumatic cylinder as the power source, the pressure is precisely controllable. The riveting pressure and running speed can be accurately set according to process requirements. The servo electric cylinder, together with a built-in position encoder, forms a closed-loop control of position and pressure, which is suitable for the dimensional tolerance fluctuations of different batches of workpieces. It solves the drawbacks of pneumatic cylinder constant pressure output, which can easily cause workpiece overpressure deformation or insufficient riveting strength. The pressure sensor is placed between the output end of the servo electric cylinder and the lifting plate to collect pressure data in real time throughout the riveting process. The control system has built-in pressure thresholds and standard pressure-displacement curves. When the pressure is abnormal, it can automatically alarm and stop the machine. The processing data of a single piece can be completely recorded and traced, which facilitates quality analysis and process optimization, avoids batch defects from the source, and stably ensures the consistency of product processing.

[0009] Preferably, the top plate and the bottom plate are fixedly connected by several lifting plate guide columns. A lifting plate linear bearing, matching the lifting plate guide columns, is fixedly mounted on the lifting plate. The lifting plate linear bearing is fitted onto the outside of the lifting plate guide columns and slides vertically with them. The lifting plate guide columns and the lifting plate linear bearing form a vertical guiding structure, ensuring the straightness of the closing fixture's movement in the vertical direction, ensuring precise and consistent closing positions, and constraining the lifting plate to always move smoothly in the vertical direction. This effectively suppresses lifting plate offset and swaying, improves the positional accuracy of closing and riveting processing, and ensures the consistency of rotor assembly processing.

[0010] Preferably, the center of the bottom of the closing groove is provided with a pre-compression fixture slide groove. A pre-compression fixture is slidably fitted inside the pre-compression fixture slide groove, with one end of the pre-compression fixture extending outside the pre-compression fixture slide groove, and a pre-compression spring connecting the other end of the pre-compression fixture to the bottom of the pre-compression fixture slide groove. When the lifting plate moves the closing fixture downward, the pre-compression fixture first contacts the rotor core. As the closing fixture continues to press down, it is subjected to a reaction force that compresses the pre-compression spring and retracts into the pre-compression fixture slide groove. Subsequently, the closing groove contacts the rotor cover to complete the closing operation. The pre-compression fixture relies on the pre-compression spring to form an elastic pre-compression structure, which can correct for problems such as improper rotor cover assembly in advance, avoid poor closing caused by the rotor cover not being properly fitted, buffer the impact of rigid contact, effectively protect the workpiece surface, and improve the closing forming quality of the rotor cover.

[0011] Preferably, a photoelectric sensor is fixedly mounted on the movable plate of the lower fixture, and the photoelectric sensor is arranged on the side of the closing support fixture. By using the photoelectric sensor arranged on the side of the placement slot to detect in real time whether there is a rotor assembly in the placement slot of the closing support fixture, the automatic identification of the workpiece arrival signal is realized, which facilitates the linkage start and stop of the equipment, effectively prevents air pressure processing without a workpiece, avoids the risk of accidental damage to tooling and workpiece, and improves the safety and automation of equipment operation.

[0012] Preferably, rotor fixing fixtures are symmetrically arranged on both sides of the closing support fixture. Each rotor fixing fixture has an arc-shaped clamping surface on its opposite side. A rotor fixing cylinder, matching the rotor fixing fixture, is fixedly mounted on the lower fixture's movable plate. The telescopic end of the rotor fixing cylinder faces the closing support fixture, and the rotor fixing fixture is fixedly assembled onto the telescopic end of the rotor fixing cylinder. The symmetrical arrangement of rotor fixing fixtures with arc-shaped clamping surfaces on both sides of the closing support fixture, driven by the rotor fixing cylinders, clamps the rotor assembly in opposite directions. This achieves precise radial positioning of the rotor, limits radial offset during rotor processing, ensures the accuracy of the closing and riveting positions, and improves the consistency of the finished product.

[0013] Preferably, the front and rear sides of the retaining support fixture are symmetrically arranged with rotor fixing fixture guide strips. These guide strips are fixedly connected to the lower fixture movable plate, and the two guide strips form a guide rail for the rotor fixing fixture to slide. The rotor fixing fixture is placed between the two guide strips and slides with them. Limiting blocks are fixed on the guide strips, and their positions correspond to the positions of the placement slots. Stroke blocks are fixed on the rotor fixing fixture, arranged opposite to the limiting blocks. The rotor fixing fixture slides smoothly along the guide rails formed by the guide strips, ensuring the straightness of the clamping action. Simultaneously, the limiting blocks and stroke blocks work together to limit the maximum feed stroke of the rotor fixing fixture, preventing excessive clamping force from damaging the rotor workpiece. This achieves precise and controllable rotor clamping position and further improves rotor positioning stability.

[0014] Preferably, a closing support plate cylinder is fixedly mounted on the side of the base plate, with the telescopic end of the closing support plate cylinder facing the direction of the lower fixture movable plate. The closing support plate is fixedly assembled to the telescopic end of the closing support plate cylinder. A closing support fixing platform is fixedly mounted on the upper surface of the base plate, and the lower plate surface of the closing support plate is flush with the upper platform surface of the closing support fixing platform. The closing support plate is driven to move horizontally by the closing support plate cylinder, working together with the closing support fixing platform on the base plate to support the lower fixture movable plate. This ensures the lower fixture movable plate is stably supported during the closing process, preventing it from sinking under pressure and improving the closing forming accuracy. Simultaneously, the flush support surfaces ensure even force distribution, avoiding localized stress concentration that could cause fixture deformation.

[0015] Preferably, the upper surface of the base plate is fixed with several movable plate guide posts, and the movable plate of the lower fixture is fixed with movable plate linear bearings that match the movable plate guide posts. The movable plate linear bearings are fitted around the movable plate guide posts and slide vertically with them. Movable plate springs are fitted around the outer side of the movable plate guide posts, and the two ends of the movable plate springs abut against the movable plate linear bearings and the base plate, respectively. When the lower fixture movable plate is subjected to a downward pressure load, it can slide downward along the movable plate guide posts with the help of the movable plate linear bearings and compress the movable plate springs. After the riveting process is completed, the movable plate springs push the lower fixture movable plate upward to reset by their own elastic force. The movable plate guide posts and movable plate linear bearings play a guiding and limiting role, ensuring that the lower fixture movable plate moves smoothly up and down without deviation. The movable plate springs can realize the automatic rebound and reset of the lower fixture movable plate, while also buffering the downward pressure impact, reducing equipment vibration, improving the riveting processing conditions, and enhancing the stability of the mechanism operation.

[0016] Preferably, the upper surface of the base plate is provided with a riveting depth limiting structure, which includes a base and a limiting post. The base is fixed to the upper surface of the base plate and located below the lower fixture movable plate. The upper surface of the base has a threaded groove, and the bottom of the limiting post has an external thread section that matches the threaded groove. The bottom of the limiting post is threadedly connected to the base through the external thread section and the threaded groove. The top surface of the limiting post and the lower surface of the lower fixture movable plate are arranged opposite each other. When the lower fixture movable plate moves downward to the set stroke, the lower surface of the lower fixture movable plate will abut against the top of the limiting post, thereby limiting the lower fixture movable plate to continue to move downward. Rotating the limiting post can change the depth to which it is screwed into the base, thereby adjusting the height of the top of the limiting post. The height of the limiting post can be easily adjusted through the threaded engagement, accurately controlling the maximum downward distance of the lower fixture movable plate, stably controlling the riveting depth, avoiding workpiece damage caused by overpressure, adapting to the processing needs of workpieces of different specifications, and the adjustment operation is simple and the limiting accuracy is reliable.

[0017] The beneficial effects of this invention are as follows: It integrates end-closing and riveting functions, enabling dual-process machining to be completed in a single clamping operation. The process connections are smooth and compact, improving work continuity, processing efficiency, and product quality. It effectively improves processing coaxiality and forming uniformity, eliminating problems such as uneven end-closing and riveting point misalignment, significantly improving product processing accuracy and production stability. It can precisely control output speed and stroke. It achieves real-time monitoring of pressure during end-closing and riveting processes. It improves the positional accuracy of end-closing and riveting, ensuring the consistency of rotor assembly processing. It effectively protects the workpiece surface and improves the end-closing forming quality of the rotor cover. It enhances equipment operating safety and automation. It guarantees the positional accuracy of end-closing and riveting, improving finished product consistency. It improves rotor positioning stability. It can buffer downward pressure impact, reduce equipment vibration, improve riveting processing conditions, and enhance mechanism operating stability. It stably controls the riveting processing depth, avoiding workpiece damage caused by overpressure. It adapts to the processing needs of workpieces of different specifications, and the adjustment operation is simple with reliable limit accuracy. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a left view of the present invention; Figure 4 yes Figure 3 Sectional view at point AA; Figure 5 It is a three-dimensional view of the base plate; Figure 6 This is a front view of the base plate; Figure 7 This is a top view of the base plate; Figure 8 yes Figure 7 Sectional view at point BB; Figure 9 It is a three-dimensional view of the rotor assembly from below when it is not yet riveted and closed. Figure 10 It is a top-down perspective view of the rotor assembly before it is riveted and closed. Figure 11 It is a three-dimensional view of the rotor assembly after the riveting is completed, viewed from below. Figure 12 It is a top-down view of the rotor assembly after the joint is closed and riveted.

[0019] In the diagram: 1. Base plate, 2. Lower fixture movable plate, 3. Closing support fixture, 4. Placement slot, 5. Clearance through hole, 6. Riveting fixture, 7. Riveting boss, 8. Positioning pin, 9. Closing support plate, 10. Lifting plate, 11. Closing fixture, 12. Closing pressure groove, 13. Top plate, 14. Servo cylinder, 15. Pressure sensor, 16. Lifting plate guide column, 17. Lifting plate linear bearing, 18. Preload fixture slide groove, 19. Preload fixture, 20. Preload spring, 21. Photoelectric sensor, 22. Rotor fixing fixture, 23. Rotor fixing cylinder, 24. Rotor fixing fixture guide bar, 25. Limiting block, 26. Stroke block, 27. Closing support plate cylinder, 28. Closing support fixing platform, 29. 30. Movable plate guide post; 31. Movable plate linear bearing; 32. Movable plate spring; 33. Base; 34. Limiting post; 35. Threaded groove; 36. External thread section; 37. Rotor core; 38. Rotor core positioning hole; 39. Rotor core riveting positioning groove; 40. Rotor cover; 41. Rotor cover riveting point. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] 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.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “upper,” “lower,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “below” other elements or features would be fixed “upper” to other elements or features. Thus, the exemplary term “lower” can include both upper and lower orientations. The device can be fixed in other ways, such as by rotating 90 degrees or being located in other orientations, and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment 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 discussed further in subsequent figures.

[0023] 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 cannot be construed as limiting the scope of protection of this application.

[0024] like Figure 1 , Figure 5 , Figure 7 and Figure 8 In the embodiments described above, an automotive motor rotor cover riveting machine includes: Base plate 1; The lower fixture movable plate 2 is located on the upper end face of the base plate 1 and slides up and down with it. The lower fixture movable plate 2 is fixed with a constriction support fixture 3. The top of the constriction support fixture 3 is provided with a placement groove 4, and the bottom of the placement groove 4 is provided with an avoidance through hole 5. The riveting fixture 6 is fixed on the upper end face of the base plate 1 and arranged inside the clearance through hole 5. The top of the riveting fixture 6 is fixed with a rivet boss 7 and a positioning pin 8. The top of the rivet boss 7 is flush with the bottom surface of the placement groove 4. The closing support plate 9 is located between the lower fixture movable plate 2 and the base plate 1 and is horizontally slidably fitted with it. Lifting plate 10 is located above the base plate 1 and is movable up and down relative to the base plate 1; like Figure 2 , Figure 3 and Figure 4 As shown, the closing fixture 11 is fixedly connected to the lifting plate 10 and has a closing groove 12 at its bottom. The closing groove 12 and the placement groove 4 are arranged vertically opposite each other. The groove wall of the closing groove 12 is an inclined guide surface. The inclined guide surface slopes from the opening end of the closing groove 12 to the bottom end of the groove towards the center of the closing groove 12. The groove wall and the bottom of the closing groove 12 are connected by a rounded corner transition.

[0025] A top plate 13 is provided above the lifting plate 10. The top plate 13 and the bottom plate 1 are fixedly connected. A servo electric cylinder 14 is fixedly mounted on the top plate 13. A pressure sensor 15 is fixedly mounted on the lifting plate 10. The telescopic end of the servo electric cylinder 14 is fixedly mounted on the pressure sensor 15.

[0026] The top plate 13 and the bottom plate 1 are fixedly connected by several lifting plate guide columns 16. The lifting plate 10 is fixedly provided with a lifting plate linear bearing 17 that matches the lifting plate guide column 16. The lifting plate linear bearing 17 is fitted on the outside of the lifting plate guide column 16 and slides up and down with it.

[0027] A pre-compression fixture groove 18 is provided at the center of the bottom of the groove 12. A pre-compression fixture 19 is slidably assembled inside the pre-compression fixture groove 18. One end of the pre-compression fixture 19 extends out of the pre-compression fixture groove 18, and a pre-compression spring 20 is connected between the other end of the pre-compression fixture 19 and the bottom of the pre-compression fixture groove 18.

[0028] like Figure 5 , Figure 6 and Figure 7 As shown, a photoelectric sensor 21 is fixedly mounted on the movable plate 2 of the lower fixture, and the photoelectric sensor 21 is arranged on the side of the closing support fixture 3.

[0029] Rotor fixing fixtures 22 are symmetrically arranged on the left and right sides of the closing support fixture 3. Each of the two rotor fixing fixtures 22 has an arc-shaped clamping surface on its opposite side. A rotor fixing cylinder 23 that matches the rotor fixing fixture 22 is fixed on the lower fixture movable plate 2. The telescopic end of the rotor fixing cylinder 23 faces the closing support fixture 3. The rotor fixing fixture 22 is fixedly assembled on the telescopic end of the rotor fixing cylinder 23.

[0030] Rotor fixing fixture guide strips 24 are symmetrically arranged on the front and rear sides of the closing support fixture 3. The rotor fixing fixture guide strips 24 are fixedly connected to the lower fixture movable plate 2. The two rotor fixing fixture guide strips 24 form a guide rail for the rotor fixing fixture 22 to slide. The rotor fixing fixture 22 is placed between the two rotor fixing fixture guide strips 24 and slides with them. A limiting block 25 is fixed on the rotor fixing fixture guide strip 24. The position of the limiting block 25 corresponds to the position of the placement groove 4. A stroke block 26 is fixed on the rotor fixing fixture 22 and arranged opposite to the limiting block 25.

[0031] A closing support plate cylinder 27 is fixedly installed on the side of the base plate 1. The telescopic end of the closing support plate cylinder 27 faces the direction of the lower fixture movable plate 2. The closing support plate 9 is fixedly assembled on the telescopic end of the closing support plate cylinder 27. A closing support fixing platform 28 is fixedly installed on the upper end surface of the base plate 1. The lower plate surface of the closing support plate 9 is flush with the upper end surface of the closing support fixing platform 28.

[0032] Several movable plate guide posts 29 are fixedly provided on the upper end surface of the base plate 1. Movable plate linear bearings 30 that match the movable plate guide posts 29 are fixedly provided on the lower fixture movable plate 2. The movable plate linear bearings 30 are fitted on the outside of the movable plate guide posts 29 and slide up and down with them. Movable plate springs 31 are fitted on the outside of the movable plate guide posts 29. The two ends of the movable plate springs 31 abut against the movable plate linear bearings 30 and the base plate 1, respectively.

[0033] The upper end face of the base plate 1 is provided with a riveting depth limiting structure, which includes a base 32 and a limiting post 33. The base 32 is fixed on the upper end face of the base plate 1 and located below the lower fixture movable plate 2. The upper end face of the base 32 is provided with a threaded groove 34. The bottom of the limiting post 33 is provided with an external thread section 35 that is adapted to the threaded groove 34. The bottom of the limiting post 33 is threadedly connected to the base 32 through the external thread section 35 and the threaded groove 34. The top surface of the limiting post 33 and the lower end face of the lower fixture movable plate 2 are arranged opposite to each other.

[0034] Specific working principle: This invention adopts an integrated step-by-step processing structure at the same workstation. By switching the support state of the lower fixture, the upper end of the rotor cover 39 is sequentially closed and the lower end is riveted together under the premise of single clamping of the rotor assembly, which completely solves the accuracy deviation problem caused by process separation and multiple clamping in traditional equipment.

[0035] When the equipment is initially in standby mode, the lifting plate 10 is in the highest position, the closing support plate 9 is in the retracted state, the lower fixture movable plate 2 is kept in the upper position under the support of the movable plate spring 31, the rotor fixing fixtures 22 on the left and right sides are opened to each other, the whole machine mechanism is reset to zero and waits for material to be loaded.

[0036] During processing, the operator places the rotor core 36, pre-installed with the rotor cover 39, into the placement groove 4 of the closing support fixture 3. The positioning pin 8 at the top of the riveting fixture 6 is inserted into the rotor core positioning hole 37 of the rotor core 36, achieving center positioning of the rotor assembly. At this time, the riveting boss 7 is housed inside the clearance through hole 5, and its upper end face is flush with the bottom of the placement groove 4, preventing it from lifting the rotor core 36 and ensuring the workpiece is placed flat. Simultaneously, the rotor core riveting positioning groove 38 corresponds vertically to the riveting boss 7, providing a positioning basis for subsequent precise riveting. The rotor assembly without closing riveting is as follows: Figure 9 and Figure 10 As shown.

[0037] Photoelectric sensors 21 arranged on the side of the placement slot 4 monitor the status of the workpiece at the workstation in real time. Once the rotor assembly is identified as being in place, the equipment starts the automatic clamping process. The rotor fixing cylinders 23 on both sides extend synchronously, driving the rotor fixing fixture 22 to slide smoothly along the guide rail formed by the rotor fixing fixture guide strip 24. The arc-shaped clamping surfaces on both sides fit against the outer circle of the rotor core 36 to achieve centered clamping. With the abutment and limiting structure of the limit block 25 and the stroke block 26, the clamping stroke is precisely controlled to prevent excessive clamping force from squeezing and damaging the rotor core 36 and the rotor cover 39, ensuring that the rotor assembly has no radial offset and no circumferential rotation during the processing.

[0038] After the workpiece is positioned, the cylinder 27 on the side of the bottom plate 1 drives the closing support plate 9 to extend horizontally. The lower end face of the closing support plate 9 fits against the upper end face of the closing support fixing table 28, forming a flat rigid support surface. This supports and limits the lower fixture movable plate 2 as a whole, so that the lower fixture movable plate 2 is completely locked and cannot float downwards, thus establishing a rigid processing benchmark for the closing process.

[0039] The servo electric cylinder 14 at the top of the top plate 13 drives the lifting plate 10 downward through the pressure sensor 15. The lifting plate 10 is stably pressed down through the vertical guidance of the lifting plate guide column 16 and the lifting plate linear bearing 17, ensuring that the feeding of the closing fixture 11 is without deviation. In the initial pressing stage, the pre-pressing fixture 19 first contacts the upper end face of the rotor core 36 to achieve elastic pre-pressing correction and correct the assembly misalignment of the rotor cover 39. As the pressing stroke continues, the pre-pressing fixture 19 compresses the pre-pressing spring 20 and retracts into the pre-pressing fixture slide groove 18 to complete the repositioning. The inclined guide surface of the closing pressure groove 12, together with the rounded corner structure, evenly squeezes the upper outer edge of the rotor cover 39, so that the upper end of the rotor cover 39 shrinks and deforms evenly, forming the rotor cover closing part 40. The closing forming depth and forming uniformity are precisely controlled by the closed-loop position of the servo electric cylinder 14.

[0040] After the closing process is completed, the servo electric cylinder 14 drives the lifting plate 10 and the closing fixture 11 to move upward and reset. Then, the closing support plate cylinder 27 drives the closing support plate 9 to retract, releasing the rigid support limit on the lower fixture movable plate 2. The lower fixture movable plate 2 resumes its up and down floating function, and the equipment switches to riveting processing mode.

[0041] Servo cylinder 14 drives the closing fixture 11 to press down again. The fixture pressure acts on the upper surface of rotor cover 39, causing rotor core 36, rotor cover 39, and lower fixture movable plate 2 to move down synchronously. The lower fixture movable plate 2 slides vertically along the movable plate guide post 29 via movable plate linear bearing 30 and compresses movable plate spring 31. During the downward movement, the rotor core riveting positioning groove 38 aligns with the rivet boss 7. The lower surface of rotor cover 39 is pressed against the rivet boss 7, causing plastic deformation to form rotor cover rivet position 41, achieving circumferential anti-rotation riveting fixation between rotor cover 39 and rotor core 36. The rotor assembly after closing and riveting is as follows: Figure 11 and Figure 12 As shown.

[0042] When the lower end face of the lower fixture movable plate 2 descends and contacts the top surface of the limiting post 33, the lower fixture movable plate 2 is rigidly limited to stop descending. The maximum floating stroke of the lower fixture is precisely limited by the threaded adjustable limiting post 33, thereby accurately controlling the riveting pressing depth and avoiding overpressure that could cause the rotor cover 39 to crack or the rotor core 36 to be damaged.

[0043] After the riveting process is completed, the servo electric cylinder 14 drives the upper mechanism to move upward and reset. The compressed movable leaf spring 31 rebounds and lifts the lower fixture movable plate 2, so that the lower fixture movable plate 2 automatically resets to the initial height. Then the rotor fixing cylinder 23 retracts, driving the rotor fixing fixture 22 to release the workpiece. The operator can then take out the finished rotor assembly with the rotor cover closing part 40 and the rotor cover riveting point 41, which is completed, completing a single complete processing cycle. The equipment then enters the next workpiece standby processing state.

[0044] It should be noted that the precision feed control logic of the servo electric cylinder 14, the real-time pressure acquisition and feedback mechanism of the pressure sensor 15, the workpiece detection sensing principle of the photoelectric sensor 21, and the extension and retraction drive and linkage start-stop control methods of each cylinder used in this invention are all existing mature technologies and are not within the scope of the structures and methods to be protected by this invention. The core improvement of this invention lies in the cooperation relationship of each mechanical fixture structure, the process layout of the overall equipment, and the integrated mechanical structure of the dual-station switching of riveting and finishing, rather than improving the program and hardware principles of the sensors, electric cylinders, and cylinders themselves.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A riveting machine for the end cap of an automotive motor rotor cover, characterized in that, include: Base plate (1); The lower fixture movable plate (2) is located on the upper end face of the base plate (1) and slides up and down with it. The lower fixture movable plate (2) is fixedly provided with a closing support fixture (3). The top of the closing support fixture (3) is provided with a placement groove (4). The bottom of the placement groove (4) is provided with an avoidance through hole (5). Riveting fixture (6), the riveting fixture (6) is fixed on the upper end face of the base plate (1) and arranged inside the clearance through hole (5). The top of the riveting fixture (6) is fixed with a rivet boss (7) and a positioning pin (8). The top of the rivet boss (7) is flush with the bottom surface of the placement groove (4). A closing support plate (9) is provided between the lower fixture movable plate (2) and the bottom plate (1) and is horizontally slidably fitted thereto; Lifting plate (10), the lifting plate (10) is located above the base plate (1) and is movable up and down relative to the base plate (1); A closing fixture (11) is fixedly connected to a lifting plate (10) and has a closing groove (12) at its bottom. The closing groove (12) and the placement groove (4) are arranged facing each other vertically. The groove wall of the closing groove (12) is an inclined guide surface. The inclined guide surface is inclined from the opening end of the closing groove (12) to the bottom end towards the center of the closing groove (12). The groove wall and the bottom of the closing groove (12) are connected by a rounded corner transition.

2. The automotive motor rotor cover riveting machine according to claim 1, characterized in that, A top plate (13) is provided above the lifting plate (10). The top plate (13) and the bottom plate (1) are fixedly connected. A servo electric cylinder (14) is fixedly provided on the top plate (13). A pressure sensor (15) is fixedly provided on the lifting plate (10). The telescopic end of the servo electric cylinder (14) is fixedly mounted on the pressure sensor (15).

3. The automotive motor rotor cover riveting machine according to claim 2, characterized in that, The top plate (13) and the bottom plate (1) are fixedly connected by several lifting plate guide columns (16). The lifting plate (10) is fixedly provided with a lifting plate linear bearing (17) that matches the lifting plate guide column (16). The lifting plate linear bearing (17) is fitted on the outside of the lifting plate guide column (16) and slides up and down with it.

4. A riveting machine for closing the end of an automotive motor rotor cover according to any one of claims 1-3, characterized in that, The center of the bottom of the closing groove (12) is provided with a pre-compression fixture slide groove (18). A pre-compression fixture (19) is slidably assembled inside the pre-compression fixture slide groove (18). One end of the pre-compression fixture (19) extends out of the pre-compression fixture slide groove (18), and a pre-compression spring (20) is connected between the other end of the pre-compression fixture (19) and the bottom of the pre-compression fixture slide groove (18).

5. A riveting machine for closing the end of an automotive motor rotor cover according to claim 4, characterized in that, A photoelectric sensor (21) is fixedly mounted on the movable plate (2) of the lower fixture, and the photoelectric sensor (21) is arranged on the side of the closing support fixture (3).

6. The automotive motor rotor cover riveting machine according to claim 5, characterized in that, The closing support fixture (3) has symmetrically arranged rotor fixing fixtures (22) on its left and right sides. Each of the two rotor fixing fixtures (22) has an arc-shaped clamping surface on its opposite side. The lower fixture movable plate (2) is fixed with a rotor fixing cylinder (23) that matches the rotor fixing fixture (22). The telescopic end of the rotor fixing cylinder (23) faces the closing support fixture (3). The rotor fixing fixture (22) is fixedly assembled on the telescopic end of the rotor fixing cylinder (23).

7. A riveting machine for closing the end of an automotive motor rotor cover according to claim 6, characterized in that, The front and rear sides of the closing support fixture (3) are symmetrically arranged with rotor fixing fixture guide strips (24). The rotor fixing fixture guide strips (24) are fixedly connected to the lower fixture movable plate (2). The two rotor fixing fixture guide strips (24) form a guide rail for the rotor fixing fixture (22) to slide. The rotor fixing fixture (22) is placed between the two rotor fixing fixture guide strips (24) and slides with them. The rotor fixing fixture guide strips (24) are fixed with limiting blocks (25). The position of the limiting blocks (25) corresponds to the position of the placement groove (4). The rotor fixing fixture (22) is fixed with stroke blocks (26) arranged opposite to the limiting blocks (25).

8. A riveting machine for closing the end of an automotive motor rotor cover according to claim 4, characterized in that, A closing support plate cylinder (27) is fixedly provided on the side of the base plate (1). The telescopic end of the closing support plate cylinder (27) faces the direction of the lower fixture movable plate (2). The closing support plate (9) is fixedly assembled on the telescopic end of the closing support plate cylinder (27). A closing support fixing platform (28) is fixedly provided on the upper surface of the base plate (1). The lower plate surface of the closing support plate (9) is flush with the upper platform surface of the closing support fixing platform (28).

9. A riveting machine for closing the end of an automotive motor rotor cover according to claim 4, characterized in that, A plurality of movable plate guide posts (29) are fixed on the upper end face of the base plate (1). Movable plate linear bearings (30) matching the movable plate guide posts (29) are fixed on the lower fixture movable plate (2). The movable plate linear bearings (30) are fitted on the outside of the movable plate guide posts (29) and slide up and down with them. Movable plate springs (31) are fitted on the outside of the movable plate guide posts (29). The two ends of the movable plate springs (31) abut against the movable plate linear bearings (30) and the base plate (1) respectively.

10. A riveting machine for closing the end of an automotive motor rotor cover according to claim 9, characterized in that, The upper end face of the base plate (1) is provided with a riveting depth limiting structure. The riveting depth limiting structure includes a base (32) and a limiting post (33). The base (32) is fixed on the upper end face of the base plate (1) and located below the lower fixture movable plate (2). The upper end face of the base (32) is provided with a threaded groove (34). The bottom of the limiting post (33) is provided with an external thread section (35) that is adapted to the threaded groove (34). The bottom of the limiting post (33) is threadedly connected to the base (32) through the external thread section (35) and the threaded groove (34). The top surface of the limiting post (33) and the lower end face of the lower fixture movable plate (2) are arranged opposite to each other.

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