Temporary bonding point generator for manufacturing iron core by adopting self-adhesive coating material strip

Abstract

The invention discloses a temporary bonding point generator for manufacturing an iron core by adopting a self-adhesive coating material belt, which is used for manufacturing a material belt of a stator iron core and a rotor iron core as the self-adhesive coating material belt. A temporary bonding point generator for generating a plurality of temporary bonding points on the surface of the iron core punching sheet before lamination is arranged on the stator and rotor iron core punching progressive die for manufacturing the stator and rotor iron core; the temporary bonding point generator comprises a plurality of laser heating heads which are arranged on the stator and rotor iron core stamping progressive die, are distributed in a scattered mode and are used for temporarily heating a plurality of local point positions on the self-adhesive coating material, and the laser heating directions of the laser heating heads point to the surface of the iron core stamping sheet. The manufacturing quality and the production efficiency of the stator and rotor iron core are improved.

Description

[0001] This application is a divisional application of the Chinese invention patent application with the application date of February 27, 2024, application number 202410213812.8, and invention name being a method for manufacturing stator and rotor cores by stamping self-adhesive coating strips. Technical Field

[0002] The invention relates to the technical field of motor stator and rotor core manufacturing, in particular to a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip, and also to a temporary bonding point generator for manufacturing a core by stamping a self-adhesive coating strip. Background Art

[0003] The stator and rotor core of the motor includes the stator core and the rotor core, both of which are made of silicon steel sheets (punching sheets) stacked together. Silicon steel sheets are usually punched on a punch press using a stamping progressive die. Usually, the stamping progressive die is provided with an upper template, a lower template and a stripper plate located between the upper template and the lower template, a plurality of punches are installed on the upper template, and a concave die matched with the punches is installed at the corresponding position of the lower template, thereby forming a plurality of blanking stations. During stamping, the material strip moves forward step by step from between the upper template and the lower template, and punches out the through holes, tooth grooves and inner contours on the motor stator core punching sheets through the stamping dies (punches and concave dies) on each station in turn, and finally the core punching sheets are punched out from the material strip at the blanking station through the blanking punch and the blanking die. In order to realize the automatic stacking of the core punching sheets, an automatic stacking die is installed below the blanking die of the stamping progressive die. The main component of the automatic stacking die is a tightening ring for accommodating the core punching sheets and having an interference fit with the core punching sheets. When blanking, under the action of the downward punching force of the blanking punch, the punched core punching sheets are squeezed into the tightening ring one by one, thereby forming a laminated structure of the core punching sheets in the tightening ring. In order to ensure the tightness of the core punching sheet stacking, a lifting core punching sheet supporting device is usually provided below the tightening ring to support the core punching sheets.

[0004] In the prior art, the stacking structure of the core punching sheets is usually fixed by stacking riveting. In the stacking riveting fixing method, stacking points are stamped on the core punching sheets. When stacked, the two adjacent core punching sheets are connected to each other through the stacking points on them. However, due to the presence of stacking points on the core punching sheets, the magnetic properties of the entire core are reduced.

[0005] The current solution to the problem of reduced magnetic properties of the iron core due to the presence of overlapping riveting points is to cancel the overlapping riveting structure between the iron core punching sheets and adopt a glue-point bonding structure. A typical example is the invention patent "Stamping Progressive Die and Glue-pointing Process for Stator and Rotor Iron Cores of Motors Using Glue-pointing Lamination" (Authorization Announcement No. CN114785060B) previously applied for and authorized by our company, which is to distribute the colloid on the surface of the corresponding iron core punching sheet position on the material strip, so that the adjacent iron core punching sheets are overlapped to form a bonding force, thereby forming a glue-pointed overlapped iron core. In order to increase the curing speed of the colloid, the colloid used is a two-component colloid, and the two components of the colloid need to be distributed on the material strip separately during glue-pointing.

[0006] However, the above-mentioned production process of the iron core by glue dispensing and lamination still has the following shortcomings:

[0007] First, the dispensing system is relatively complex, the system maintenance cost is high, and the production efficiency is relatively low;

[0008] The second is the production process of the iron core produced by glue dot lamination. Since the glue is distributed in a dispersed dot manner on the iron core punching sheets, the bonding strength between the iron core punching sheets is relatively low. And because the glue dot system is limited by the size of the glue spray head, it is impossible to increase the density of glue dot by dense glue dot method, thereby reducing the overall bonding strength of the glue dot lamination iron core. Summary of the invention

[0009] In order to solve the above problems, the present invention proposes a method for manufacturing stator and rotor cores by stamping self-adhesive coating strips, aiming to overcome the above defects existing in the prior art and improve the manufacturing quality and production efficiency of stator and rotor cores. The specific technical solution is as follows:

[0010] A method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip comprises the following steps:

[0011] S1. Preparation of self-adhesive coating material strip: preparing a material strip for making iron core punching sheets, wherein the material strip is a self-adhesive coating material strip, and at least one of the upper and lower surfaces of the self-adhesive coating material strip is provided with a layer of self-adhesive coating film, wherein the self-adhesive coating film is solid at room temperature and can be melted after heating;

[0012] S2. Punching of core punching sheets: installing the stator and rotor core punching progressive die on a high-speed punch press, punching the self-adhesive coating strip at a punching station, and blanking at a blanking station to obtain core punching sheets;

[0013] S3, iron core forming: the iron core punching sheets are stacked, hot pressed and cooled in sequence to obtain the iron core product;

[0014] Wherein, a stacking station is arranged below the blanking station of the stator and rotor core stamping progressive die, and the stacking in the core forming of step S3 is to stack the core punching sheets in the stacking station by rotating stacking to offset the unevenness error and uneven thickness error of the self-adhesive coating strip;

[0015] Wherein, a hot pressing station is also arranged next to the high-speed punch press, and the hot pressing in the iron core forming in step S3 is performed on the hot pressing station, and a press is arranged on the hot pressing station, and an induction heating device is arranged on the press, so that the iron core can be inductively heated while the laminated iron core is pressurized, so that the self-adhesive coating film on the surface of the iron core punching sheet melts and forms a sticky film;

[0016] The cooling during the iron core forming in step S3 allows the melted self-adhesive coating film to be cooled and solidified again, so that the laminated iron core is bonded and formed.

[0017] As one of the preferred solutions for disposing the self-adhesive coating film on the material strip, the self-adhesive coating film may be disposed on only one side of the material strip, while the other side of the material strip is not disposed with the self-adhesive coating film.

[0018] As a second preferred solution for providing the self-adhesive coating film on the material strip, the self-adhesive coating film can also be provided on both sides of the material strip at the same time to further enhance the bonding strength of the stacked core punching sheets.

[0019] The hot pressing station is provided with N presses, and the laminated iron core is sequentially pressurized and heated by the N presses and then cooled, so that the laminated iron core is bonded and formed.

[0020] Preferably, the number of the presses N=3, and the presses are preferably servo presses.

[0021] By arranging multiple presses at the hot pressing station, the laminated core can be heated and pressurized in stages, which can avoid the disadvantage of taking too long due to one-time heating and pressurizing. The heating and pressurizing rhythm of the laminated core is synchronized with the stamping rhythm of the stator and rotor core stamping progressive die, thereby improving the production efficiency of the core production.

[0022] As one of the preferred schemes for rotational stacking in core forming, the rotational stacking in core forming in step S3 adopts segmented rotational stacking to directly form an integral core; the segmented rotational stacking means that a rotation angle is set between upper and lower adjacent core punching sheets when stacked.

[0023] As the second preferred scheme for rotational stacking in core forming, the rotational stacking in the core forming of step S3 adopts segmented rotational stacking; the segmented rotational stacking refers to dividing an integral core into several segmented cores; when adopting segmented rotational stacking, several segmented cores are first formed by stacking core punching sheets, and then the several segmented cores are stacked to form an integral core; wherein, the core punching sheets of a single segmented core do not rotate when stacked, and rotational stacking is adopted for two upper and lower adjacent segmented cores when stacked.

[0024] In the present invention, the stator and rotor core stamping progressive die is further provided with a temporary bonding point generator for generating a plurality of temporary bonding points on the surface of the core punching sheets before stacking.

[0025] As one of the preferred schemes of the temporary bonding point generator, the temporary bonding point generator includes a temporary glue dispensing station arranged after the stamping station of the stator and rotor core stamping progressive die and before the blanking station, and a glue dispensing device arranged on the temporary glue dispensing station for forming a number of dispersed and room temperature curing glue points on the material strip.

[0026] Preferably, the glue of the room temperature curing glue point is a single-component glue curable at room temperature, which is applied on the material belt by local point spraying of a glue dispensing device.

[0027] As the second preferred scheme of the temporary bonding point generator, the temporary bonding point generator includes a temporary heating station arranged after the stamping station of the stator and rotor core stamping progressive die and before the blanking station, and a number of dispersedly distributed laser heating heads arranged on the temporary heating station for temporarily heating a number of local points on the material strip so that the self-adhesive coating film located at and near the local points on the material strip is heated and melted, and the laser heating direction of the laser heating head points to the surface of the core punching sheet.

[0028] Preferably, when a laser heating head is used as the temporary bonding point generator, the temporary heating station set after the punching station and before the blanking station can be cancelled, and the temporary bonding point generator can be directly set on the blanking station, specifically, a number of punch laser penetration holes are set on the blanking punch of the blanking station, and the laser heating head is set at the rear of the blanking punch and aligned with the punch laser penetration holes on the blanking punch. In this way, the local points on the core punch can be heated synchronously while blanking.

[0029] When the self-adhesive coating tape is a self-adhesive coating tape with self-adhesive coating films on both sides, the laser heating direction of the laser heating head points to the upper surface or lower surface of the tape, or laser heating heads pointing to the upper surface and lower surface of the tape can be respectively arranged at the upper and lower positions of the tape.

[0030] When the self-adhesive coating strip is a self-adhesive coating strip with a self-adhesive coating film only on one or two sides, the arrangement scheme of the laser heating head adopts one of the following two arrangement schemes: the laser heating direction of the laser heating head points to the side of the strip on which the self-adhesive coating film is provided, so as to achieve local direct heating of the self-adhesive coating film; or the laser heating direction of the laser heating head points to the side of the strip on which the self-adhesive coating film is not provided, so as to achieve local indirect heating of the self-adhesive coating film through heat transfer between upper and lower adjacent core punchings when they are overlapped up and down.

[0031] As another optional solution, regardless of whether the self-adhesive coating film is provided on only one side of the material strip or on both sides of the material strip, laser heating heads pointing to the upper and lower surfaces of the material strip can be provided at the upper and lower positions of the material strip respectively.

[0032] As a further improvement of the present invention: a number of the laser heating heads are divided into N groups, each group of laser heating heads are arranged at intervals according to the same circumferential line, and the circumferential lines of laser heating heads in different groups are coaxial with each other; a temperature controller for controlling the heating temperature of the self-adhesive coating film at the local point is also arranged on the temporary heating station, and the temperature controller includes a rotating laser mask plate driven to rotate by a servo motor, and a number of mask plate laser penetration holes arranged on the rotating laser mask plate, and a number of mask plate laser penetration holes are divided into N groups, each group of mask plate laser penetration holes are arranged at intervals according to the same circumferential line and the diameter of the circumferential line is the same as the diameter of the circumferential line of the laser heating head of the corresponding group and is coaxial, and the laser heating head is arranged at the rear position of the rotating laser mask plate.

[0033] The number of laser penetration holes in each group of mask plates is the same as or different from the number of laser heating heads in the corresponding group.

[0034] Preferably, the laser heating heads can be divided into only one group and arranged on a circle with a larger diameter as much as possible.

[0035] Preferably, when the laser heating head is arranged at the rear part of the blanking punch, a mask template placement cavity can be reserved on the core stamping progressive die near the rear part of the blanking punch, the laser mask template is arranged in the mask template placement cavity, and the laser mask template is fixed on the output shaft of the servo motor.

[0036] Preferably, the servo motor is a variable frequency speed regulation servo motor, which can adjust the amount of laser heating energy emitted to the material strip within a set time by optimizing the number of laser penetration holes on the rotating laser mask plate and changing the rotation speed of the rotating laser mask plate by the variable frequency speed regulation servo motor, thereby achieving precise control of the heating temperature of local points on the material strip.

[0037] The method of forming the segmented iron core by the iron core punching sheet in the segmented iron core tightening ring is as follows:

[0038] (1) During the stamping process of the core punching sheet in step S2, a temporary bonding point generator is turned on, and a plurality of temporary bonding points are formed on the core punching sheet position of the self-adhesive coating material strip by a glue spraying operation of a glue dispensing device; or a laser heating head is used to laser heat the core punching sheet of the self-adhesive coating material strip, so that the self-adhesive coating film at a plurality of local points on the core punching sheet melts to form a plurality of temporary bonding points;

[0039] (2) During the core forming in step S3, the core punching sheets enter the segmented core tightening ring on the blanking station, and the upper and lower adjacent core punching sheets are bonded together through temporary bonding points. Multiple core punching sheets are overlapped in sequence in the segmented core tightening ring to form a segmented core.

[0040] Note that in order to prevent the upper and lower adjacent segmented cores from sticking together during continuous stamping production, no temporary bonding point is set for the topmost core punch of the segmented core. That is, when stamping the topmost core punch of the segmented core, the dispensing device or the laser heating head needs to be turned off through the control system.

[0041] Generally, only one of the above-mentioned glue dispensing device and laser heating head as temporary bonding point generators needs to be set. Of course, in order to enhance the bonding and curing effect, the glue dispensing device and the laser heating head can also be set at the same time. When they are set at the same time, the temporary heating station can be set behind the temporary glue dispensing station according to the stamping process. In this way, after glue dispensing, the laser heating effect of the laser heating head is used to make the glue at the glue dispensing position melt evenly, preventing the glue from protruding too much locally or the glue protruding in different places, which affects the uniformity of the thickness of the iron core after lamination.

[0042] In the present invention, a segmented iron core tightening ring for forming a segmented iron core is rotatably arranged on the stacking station, and a segmented iron core rotating stacking mechanism for realizing the rotating stacking of the segmented iron core is connected below the segmented iron core tightening ring.

[0043] In the present invention, in order to realize the mutual nesting of stator stamping and rotor stamping, a motor rotor punching station group and a motor stator punching station group are sequentially arranged on the core stamping progressive die according to the moving direction of the material strip, and a stamping station, a blanking station and a temporary bonding point generator are respectively arranged on the motor rotor punching station group and the motor stator punching station group, and a segmented core tightening ring for forming a segmented core is respectively arranged under each of the blanking stations.

[0044] The self-adhesive coating material strip in the present invention is manufactured by thermally spraying a layer of self-adhesive coating film on the surface of the material strip and then cooling and solidifying it.

[0045] The beneficial effects of the present invention are:

[0046] First, the present invention provides a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip. The self-adhesive coating strip is used as the strip for manufacturing the core. The self-adhesive coating film on the upper surface of the strip is glued and solidified after the core punching sheets are stacked, heated and cooled. Compared with the existing spot glue stacking method, the gluing area between the core punching sheets is greatly increased, thereby improving the overall bonding strength of the spot glue stacked core, simplifying the process flow of spot glue stacking to produce the core, and improving the production efficiency of the core manufacturing.

[0047] Second, the present invention provides a method for manufacturing a stator and rotor core by stamping with a self-adhesive coating strip. The self-adhesive coating strip is used as the strip for manufacturing the core. During the stamping process, only a small number of temporary bonding points need to be set on the strip to achieve temporary bonding of the core punching sheets, and the time-consuming process of heating and curing the core as a whole is postponed. This can shorten the cycle time of the stamping process, thereby improving the stamping and stacking efficiency of the stator and rotor core stamping progressive die.

[0048] Third, the present invention provides a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip. By arranging multiple presses at the hot pressing station, on the one hand, the multi-stage heating and pressurizing of the laminated core can be achieved, which can avoid the disadvantage of taking too long time due to one-time heating and pressurizing. On the other hand, the heating and pressurizing rhythm of the laminated core is synchronized with the stamping rhythm of the stator and rotor core stamping progressive die, thereby further improving the production efficiency of the core manufacturing.

[0049] Fourthly, the present invention provides a method for manufacturing stator and rotor cores by stamping self-adhesive coated material strips, which further simplifies the process flow of core manufacturing and improves the production efficiency of core manufacturing by directly setting a laser heating head as a temporary bonding point generator on the blanking station.

[0050] Fifth, the present invention provides a method for manufacturing stator and rotor cores by stamping with self-adhesive coating strips, which solves the problem of uniform thickness of the overall core by decomposing the overall core into a plurality of segmented cores and rotating and stacking the segmented cores in sequence.

[0051] Sixth, the present invention provides a method for manufacturing stator and rotor cores by stamping with self-adhesive coating strips, wherein a rotating laser mask is arranged in front of the laser heating head, so that the laser emitted by the laser heating head can only reach the surface of the core punching sheet of the self-adhesive coating strip by passing through the laser penetration holes on the rotating laser mask intermittently, thereby realizing intermittent heating of local points on the core punching sheet, which is beneficial to accurately control the heating temperature of the local position of the core punching sheet, and can effectively prevent damage to the self-adhesive coating rubber material caused by local temperature overheating, thereby improving the quality of bonding. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a process flow diagram of a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip according to the present invention;

[0053] Figure 2 It is a structural schematic diagram of setting a dispensing device and a laser heating head on a progressive die for stamping a stator and rotor core;

[0054] Figure 3 It is a structural schematic diagram of a segmented core rotation stacking mechanism connected to a stator and rotor core stamping progressive die;

[0055] Figure 4 yes Figure 3 One of the partial enlarged views;

[0056] Figure 5 yes Figure 3 The second partial enlarged view;

[0057] Figure 6 is Figure 2 Schematic diagram of the structure of setting a mask plate laser penetration hole on a rotating laser mask plate.

[0058] In the figure: 37, motor rotor punching station group, 38, motor stator punching station group, 39, glue dispensing device, 40, laser heating head, 41, self-adhesive coating tape, 42, servo motor, 43, rotary laser mask, 44, mask laser penetration hole, 45, convex laser penetration hole, 46, mask placement cavity.

[0059] In the figure: 1. Core stamping progressive die, 2. Core punching blanking station, 3. Segmented core tightening ring, 4. Segmented core sending station, 5. Segmented core rotating stacking station, 6. Fluorescent directional marking device, 7. Segmented core automatic rotation module, 8. Press, 9. Ultraviolet lamp, 10. Visual recognition camera, 11. Core positioning die, 12. Workbench, 13. Segmented core transfer manipulator, 14. Integral core, 15. Belt conveyor, 16. Push cylinder, 17. Lifting core punching support device (servo 1. Magnetic top support suction cup; 2. Magnetic vacuum combination top support suction cup; 3. Marking seat; 4. Lifting cylinder; 5. Fluorescent coating marking pen; 6. Pushing block; 7. Extension arm; 8. Segmented iron core; 9. Horizontal guide rail; 10. Lifting mechanism; 11. Horizontal rotating arm; 12. Rotating arm rotation module; 13. Marking seat; 14. Lifting cylinder; 15. Fluorescent coating marking pen; 16. Disc-shaped strong electromagnet; 17. Vacuum suction cup. DETAILED DESCRIPTION

[0060] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0061] like Figures 1 to 6 The present invention shows an embodiment of a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip, comprising the following steps:

[0062] S1. Preparation of self-adhesive coating material strip: preparing a material strip for making iron core punching sheets, the material strip being a self-adhesive coating material strip 41, at least one of the upper and lower surfaces of the self-adhesive coating material strip 41 being provided with a layer of self-adhesive coating film, the self-adhesive coating film being solid at room temperature and being meltable after being heated;

[0063] S2. Punching of iron core punching sheets: installing the stator and rotor iron core punching progressive die 1 on a high-speed punch press, punching the self-adhesive coating strip 41 at a punching station, and blanking at a blanking station to obtain iron core punching sheets;

[0064] S3, iron core forming: the iron core punching sheets are stacked, hot pressed and cooled in sequence to obtain the iron core product;

[0065] Wherein, a stacking station is provided below the blanking station of the stator and rotor core stamping progressive die 1, and the stacking in the core forming of step S3 is to stack the core punching sheets in the stacking station by rotating stacking to offset the unevenness error and uneven thickness error of the self-adhesive coating strip;

[0066] Wherein, a hot pressing station is also arranged next to the high-speed punch press, and the hot pressing in the iron core forming in step S3 is performed on the hot pressing station, and a press 8 is arranged on the hot pressing station, and an induction heating device is arranged on the press 8, so that the iron core can be inductively heated while the laminated iron core is pressurized, so that the self-adhesive coating film on the surface of the iron core punching sheet melts and forms viscosity;

[0067] The cooling during the iron core forming in step S3 allows the melted self-adhesive coating film to be cooled and solidified again, so that the laminated iron core is bonded and formed.

[0068] As one of the preferred solutions for disposing the self-adhesive coating film on the material strip, the self-adhesive coating film may be disposed on only one side of the material strip, while the other side of the material strip is not disposed with the self-adhesive coating film.

[0069] As a second preferred solution for providing the self-adhesive coating film on the material strip, the self-adhesive coating film can also be provided on both sides of the material strip at the same time to further enhance the bonding strength of the stacked core punching sheets.

[0070] The hot pressing station is provided with N presses 8 , and the laminated core is sequentially pressurized and heated by the N presses 8 and then cooled, so that the laminated core is bonded and formed.

[0071] Preferably, the number N of the presses 8 is 3, and the presses 8 are preferably servo presses.

[0072] By arranging a plurality of presses 8 at the hot pressing station, the laminated core can be heated and pressurized in stages, thereby avoiding the disadvantage of taking too long due to one-time heating and pressurizing. The heating and pressurizing rhythm of the laminated core is synchronized with the stamping rhythm of the stator and rotor core stamping progressive die 1, thereby improving the production efficiency of the core production.

[0073] As one of the preferred schemes for rotational stacking in core forming, the rotational stacking in core forming in step S3 adopts segmented rotational stacking to directly form an integral core 14; the segmented rotational stacking means that a rotation angle is set between upper and lower adjacent core punching sheets when stacked.

[0074] As the second preferred scheme for rotational stacking in core forming, the rotational stacking in the core forming of step S3 adopts segmented rotational stacking; the segmented rotational stacking refers to dividing an integral core 14 into a plurality of segmented cores 27; when adopting segmented rotational stacking, a plurality of segmented cores 27 are first formed by stacking core punching sheets, and then the plurality of segmented cores 27 are stacked to form an integral core 14; wherein, the core punching sheets of a single segmented core 27 do not rotate during stacking, and rotational stacking is adopted for two upper and lower adjacent segmented cores 27 during stacking.

[0075] In this embodiment, the stator and rotor core stamping progressive die 1 is also provided with a temporary bonding point generator for generating a plurality of temporary bonding points on the surface of the core punching sheets before stacking.

[0076] As one of the preferred schemes of the temporary bonding point generator, the temporary bonding point generator includes a temporary glue dispensing station arranged after the stamping station of the stator and rotor core stamping progressive die 1 and before the blanking station, and a glue dispensing device 39 arranged on the temporary glue dispensing station for forming a number of dispersed room temperature curing glue points on the material strip.

[0077] Preferably, the glue of the room temperature curing glue point is a single-component glue that can be cured at room temperature, and is applied on the material belt by local point spraying of the glue dispensing device 39.

[0078] As the second preferred scheme of the temporary bonding point generator, the temporary bonding point generator includes a temporary heating station arranged after the stamping station of the stator and rotor core stamping progressive die 1 and before the blanking station, and a number of dispersedly distributed laser heating heads 40 arranged on the temporary heating station for temporarily heating a number of local points on the material strip so that the self-adhesive coating film located at and near the local points on the material strip is heated and melted, and the laser heating direction of the laser heating head 40 is directed to the surface of the core punching sheet.

[0079] Preferably, when the laser heating head 40 is used as the temporary bonding point generator, the temporary heating station set after the punching station and before the blanking station can be cancelled, and the temporary bonding point generator can be directly set on the blanking station 2. Specifically, a number of punch laser penetration holes 45 are set on the blanking punch of the blanking station 2, and the laser heating head 40 is set at the rear of the blanking punch and aligned with the punch laser penetration holes 45 on the blanking punch. In this way, the local points on the core punch can be heated synchronously while blanking.

[0080] When the self-adhesive coating tape 41 is a self-adhesive coating tape with self-adhesive coating films on both sides, the laser heating direction of the laser heating head 40 points to the upper surface or lower surface of the tape, or the laser heating head 40 pointing to the upper surface and lower surface of the tape can be respectively arranged at the upper and lower positions of the tape.

[0081] When the self-adhesive coating strip is a self-adhesive coating strip having a self-adhesive coating film only on one or two sides, the arrangement scheme of the laser heating head 40 adopts one of the following two arrangement schemes: the laser heating direction of the laser heating head 40 points to the side of the strip on which the self-adhesive coating film is provided, so as to achieve local direct heating of the self-adhesive coating film; or the laser heating direction of the laser heating head 40 points to the side of the strip on which the self-adhesive coating film is not provided, so as to achieve local indirect heating of the self-adhesive coating film through heat transfer between upper and lower adjacent core punchings when they are overlapped up and down.

[0082] As another optional solution, regardless of whether the self-adhesive coating film is provided on only one side of the material strip or on both sides of the material strip, laser heating heads 40 pointing to the upper and lower surfaces of the material strip can be provided at the upper and lower positions of the material strip, respectively.

[0083] As a further improvement of the present invention: a number of the laser heating heads 40 are divided into N groups, each group of laser heating heads 40 are arranged at intervals according to the same circumferential line, and the circumferential lines of laser heating heads 40 in different groups are coaxial with each other; a temperature controller for controlling the heating temperature of the self-adhesive coating film at the local point is also arranged on the temporary heating station, and the temperature controller includes a rotating laser mask plate 43 driven to rotate by a servo motor 42, and a number of mask plate laser penetration holes 44 arranged on the rotating laser mask plate 43, and a number of mask plate laser penetration holes 44 are divided into N groups, each group of mask plate laser penetration holes 44 are arranged at intervals according to the same circumferential line and the diameter of the circumferential line is the same as the diameter of the circumferential line of the laser heating heads 40 of the corresponding group and is coaxial, and the laser heating heads 40 are arranged at the rear position of the rotating laser mask plate 43.

[0084] The number of the laser penetration holes 44 of each group of mask plates is the same as the number of the laser heating heads 40 of the corresponding group, or may be different.

[0085] Preferably, the laser heating heads 40 can be divided into only one group and arranged on a circle with a larger diameter as much as possible.

[0086] Preferably, when the laser heating head 40 is arranged at the rear part of the blanking punch, a mask template placement cavity 46 can be reserved on the core stamping progressive die 1 near the rear part of the blanking punch, the laser mask template 43 is arranged in the mask template placement cavity 46, and the laser mask template 43 is fixed on the output shaft of the servo motor 42.

[0087] Preferably, the servo motor 42 is a variable frequency speed regulation servo motor, which can adjust the amount of laser heating energy emitted to the material strip within a set time by optimizing the number of mask laser penetration holes 44 on the rotating laser mask plate 43 and changing the rotation speed of the rotating laser mask plate 43 by the variable frequency speed regulation servo motor, thereby achieving precise control of the heating temperature of local points on the material strip.

[0088] The method of forming the segmented core 27 in the segmented core tightening ring 3 by the core punching sheet is as follows:

[0089] (1) During the stamping process of the core punching sheet in step S2, the temporary bonding point generator is turned on, and a plurality of temporary bonding points are formed on the core punching sheet positions of the self-adhesive coating material strip 41 by the glue spraying operation of the glue dispensing device 39; or the core punching sheet of the self-adhesive coating material strip 41 is laser-heated by the laser heating head 40, so that the self-adhesive coating film at a plurality of local points on the core punching sheet melts to form a plurality of temporary bonding points;

[0090] (2) During the core forming in step S3, the core punching sheets enter the segmented core tightening ring 3 on the blanking station 2, and the upper and lower adjacent core punching sheets are bonded together through temporary bonding points. Multiple core punching sheets are overlapped in sequence in the segmented core tightening ring to form a segmented core 27.

[0091] Note that in order to prevent the upper and lower adjacent segmented cores 27 from being bonded together during continuous stamping production, no temporary bonding point is set on the topmost core punch of the segmented core 27. That is, when stamping the topmost core punch of the segmented core 27, the glue dispensing device 39 or the laser heating head 40 needs to be turned off by the control system.

[0092] Generally, only one of the above-mentioned glue dispensing device 39 and laser heating head 40 as temporary bonding point generators needs to be set. Of course, in order to enhance the bonding and curing effect, the glue dispensing device 39 and the laser heating head 40 can also be set at the same time. When they are set at the same time, the temporary heating station can be set behind the temporary glue dispensing station according to the stamping process, so that after glue dispensing, the laser heating effect of the laser heating head 40 is used to make the glue at the glue dispensing position melt evenly, preventing the glue from protruding too much locally or the glue protruding in different places, which affects the uniformity of the thickness of the iron core after lamination.

[0093] In this embodiment, a segmented core tightening ring 3 for forming a segmented core 27 is rotatably provided on the stacking station, and a segmented core rotating stacking mechanism for realizing the rotating stacking of the segmented core is connected below the segmented core tightening ring.

[0094] In this embodiment, in order to achieve mutual nesting of stator stamping and rotor stamping, a motor rotor punching station group 37 and a motor stator punching station group 38 are arranged in sequence on the core stamping progressive die 1 according to the moving direction of the material strip, and a stamping station, a blanking station 2 and a temporary bonding point generator are respectively arranged on the motor rotor punching station group 37 and the motor stator punching station group 38, and a segmented core tightening ring 3 for forming a segmented core 27 is respectively arranged under each of the blanking stations.

[0095] The self-adhesive coating material strip 41 in this embodiment is manufactured by thermally spraying a layer of self-adhesive coating film on the surface of the material strip and then cooling and solidifying it.

[0096] In this embodiment, the segmented core rotation stacking mechanism includes a segmented core sending station 4 arranged below the segmented core tightening ring 3 for sending the segmented core 27 outward, and a segmented core rotation stacking station 5 connected to the segmented core sending station 4 for rotating a plurality of segmented cores 27 in sequence by a certain angle and then stacking them to form an integral core 14; wherein, the segmented core sending station 4 is provided with a fluorescent directional marking device 6 that uses a fluorescent coating liquid to mark lines so as to form a fluorescent coating liquid reference line on the upper surface of the segmented core 27, and the segmented core rotation stacking station 5 is provided with a device for operating the segmented core 27 to rotate a relative An automatic segmented core rotation module 7 for adjusting the angle of the segmented core, and a press 8 for stacking and pressing the segmented cores 27 that are rotated and overlapped in sequence to form an integral core 14. An ultraviolet lamp 9 and a visual recognition camera 10 are also provided on the segmented core sending station 4. The automatic segmented core rotation module 7 and the visual recognition camera 10 are respectively connected to a control system. The control system uses the position of the fluorescent coating reference line on the upper surface of the segmented core 27 obtained by the visual recognition camera 10 as a reference to drive the automatic segmented core rotation module 7 to rotate each segmented core 27 by a relative angle in sequence and then stack the segmented cores 27 to form an integral core 14.

[0097] In this embodiment, a core positioning mold 11 for positioning the segmented core 27 during stacking is provided on the segmented core rotation stacking station 5. The core positioning mold 11 is installed on the workbench 12 of the press 8. Each of the segmented cores 27 is rotated a certain angle in turn and then stacked on the core positioning mold 11.

[0098] Preferably, a segmented iron core transfer robot 13 for transferring the segmented iron core 27 from the segmented iron core sending station 4 to the segmented iron core rotating stacking station 5 is provided between the segmented iron core sending station 4 and the segmented iron core rotating stacking station 5, and the segmented iron core transfer robot 13 is connected to the control system.

[0099] As one of the preferred schemes of the segmented iron core automatic rotation module in this embodiment, the segmented iron core automatic rotation module 7 is a dividing plate driven by a servo reduction motor arranged on the workbench 12 of the press 8, and the iron core positioning mold 11 is installed on the dividing plate. The servo reduction motor is connected to the control system, and the control system drives the servo reduction motor to drive the dividing plate to rotate, thereby realizing the rotation of the segmented iron core 27 angle.

[0100] As the second preferred solution of the segmented iron core automatic rotation module in this embodiment, the segmented iron core automatic rotation module 7 is arranged on the segmented iron core transfer robot 13. After the segmented iron core transfer robot 13 grabs the segmented iron core 27, the segmented iron core automatic rotation module 7 arranged on the segmented iron core transfer robot 13 realizes the rotation of the segmented iron core 27.

[0101] In this embodiment, the segmented iron core sending station 4 is provided with a belt conveyor 15 for conveying the segmented iron core 27 to the position of the segmented iron core transfer robot 13 and a pushing cylinder 16 for transferring the segmented iron core 27 from the position below the segmented iron core tightening ring 3 to the belt conveyor 15. The pushing cylinder 16 is located on one side of the discharging position of the segmented iron core 27 below the segmented iron core tightening ring 3, and the belt conveyor 15 is located on the other side of the discharging position of the segmented iron core 27 below the segmented iron core tightening ring 3.

[0102] In this embodiment, a lifting type core punch supporting device 17 is provided below the segmented core tightening ring 3 for supporting the bottom core punch in the segmented core tightening ring 3 when the core punches are overlapped; a supporting suction cup is provided at the upper end of the lifting type core punch supporting device 17 for supporting and sucking the bottom core punch in the segmented core tightening ring 3; the supporting suction cup is a magnetic supporting suction cup or a vacuum supporting suction cup, or a magnetic vacuum combined supporting suction cup which is a combination of a magnetic supporting suction cup and a vacuum supporting suction cup.

[0103] Preferably, when the magnetic vacuum combined supporting suction cup is used, the magnetic supporting suction cup in the magnetic vacuum combined supporting suction cup is a disc-shaped powerful electromagnet 35, and the vacuum supporting suction cup is a plurality of vacuum suction cups 36 installed on the mounting hole of the disc-shaped powerful electromagnet 35.

[0104] Preferably, the lifting type core punching sheet supporting device 17 is a servo electric push rod, and the supporting suction cup is arranged at the top end of the telescopic rod of the servo electric push rod.

[0105] Preferably, the fluorescent directional marking device 6 includes a marking seat 32 movably arranged on the segmented iron core sending station 4, a lifting cylinder 33 arranged on the marking seat 32, and a fluorescent coating marking pen 34 arranged on the piston rod of the lifting cylinder 33.

[0106] Preferably, the pushing cylinder 16 is a double-axis pushing cylinder, and a pushing block 25 for pushing the segmented iron core 27 is connected between the front end parts of a pair of piston rods of the double-axis pushing cylinder. An extension arm 26 extending forward is provided at the upper position of the pushing block 25, and a marking seat 32 of the fluorescent directional marking device 6 is provided at the end of the extension arm 26. The distance between the fluorescent coating marking pen 34 and the front end surface of the pushing block 25 is greater than the outer contour size of the segmented iron core 27.

[0107] Preferably, the segmented iron core transfer robot 13 includes a horizontal guide rail 28, a lifting mechanism 29 movably arranged on the horizontal guide rail 28, a horizontal rotating arm 30 arranged at the lower end of the lifting mechanism 29, and a gripper arranged at the cantilever end of the horizontal rotating arm 30 for grabbing the segmented iron core 27, and an arm rotation module 31 for realizing the rotation of the horizontal rotating arm 30 is arranged at the connecting part between the lower end of the lifting mechanism 29 and the horizontal rotating arm 30, and a segmented iron core automatic rotation module 7 is arranged between the gripper and the cantilever end of the horizontal rotating arm 30.

[0108] In the present invention, a positioning pin hole is punched on the core punching sheet of the segmented core 27, and a positioning pin for positioning the segmented core 27 is provided on the core positioning mold 11. The segmented core 27 is positioned on the positioning pin of the core positioning mold 11 through the positioning pin hole.

[0109] Preferably, the gripper of the segmented core transfer robot 13 is provided with a positioning pin avoidance hole to ensure that when the segmented core 27 is stacked onto the core positioning mold 11, it will not interfere with the positioning pins on the core positioning mold.

[0110] A segmented iron core stacking method using a segmented iron core rotating stacking mechanism with ultraviolet identification, comprising the following steps:

[0111] (1) Production of core punching sheets: The material strip for producing core punching sheets enters the core punching progressive die 1 of the high-speed punch press for punching, and the core punching sheets are formed at the core punching blanking station 2 of the core punching progressive die 1;

[0112] (2) Forming of the segmented iron core: The punched iron core sheets are sequentially put into the segmented iron core tightening ring 3 below the iron core sheet blanking station 2, and a plurality of iron core sheets are stacked in the segmented iron core tightening ring 3 to form a segmented iron core 27; the segmented iron core 27 is fixed on the top supporting suction cup of the lifting type iron core sheet supporting device 17 after coming out from below the segmented iron core tightening ring 3;

[0113] (3) Fluorescent coating liquid marking: The control system drives the push cylinder 16 to move, so that the push block 25 at the front end of the piston rod of the push cylinder 16 moves forward toward the segmented iron core 27, thereby driving the extension arm 26 on the push block 25, the marking seat 32 on the extension arm 26, the lifting cylinder 33 on the marking seat 32 and the fluorescent coating liquid marking pen 34 on the lifting cylinder 33 to move forward synchronously; when the fluorescent coating liquid marking pen 34 moves to the position above the segmented iron core 27, the control system drives the lifting cylinder 33 to move, so that the fluorescent coating liquid marking pen 34 descends to contact the upper surface of the segmented iron core 27, and the push block 25 on the push cylinder 16 continues to move forward, so that the fluorescent coating liquid marking pen 34 moves forward a certain distance, thereby marking a fluorescent coating liquid reference line on the upper surface of the segmented iron core 27;

[0114] (4) Segmented iron core sending: After the fluorescent coating liquid marking is completed, the lifting cylinder 33 reverses and drives the fluorescent coating liquid marking pen 34 to move upward so as to break away from the segmented iron core 27. At the same time, the control system releases the supporting suction cup on the top of the lifting iron core punching support device 17, and the pushing block 25 at the front end of the piston rod of the pushing cylinder 16 continues to move forward until it contacts one side of the segmented iron core 27, until the segmented iron core 27 is pushed from the supporting suction cup on the top of the lifting iron core punching support device 17 to the belt conveyor 15, and then the pushing cylinder 16 retreats and resets. The segmented iron core 27 on the belt conveyor 15 is then sent to the end of the belt conveyor 15 close to the segmented iron core rotating stacking station 5;

[0115] (5) Identification of the fluorescent coating liquid baseline of the segmented iron core: Under the irradiation of the ultraviolet lamp 9 on the segmented iron core sending station 4, the fluorescent coating liquid baseline on the upper surface of the segmented iron core 27 emits fluorescence and is recognized by the visual recognition camera 10; the control system obtains the original angle position information of the segmented iron core 27 according to the position of the fluorescent coating liquid baseline recognized by the visual recognition camera 10;

[0116] (6) Transfer of the segmented iron core: The control system drives the segmented iron core transfer robot 13 to move, and the segmented iron core transfer robot 13 grabs the segmented iron core 27 and transfers the segmented iron core 27 to the top of the iron core positioning mold 11;

[0117] (7) Rotational stacking of the segmented core: The control system calculates the relative rotation angle of the segmented core 27 based on the original angular position information of the segmented core 27, and then drives the segmented core automatic rotation module 7 to rotate the segmented core 27 and the core positioning mold 11 by a relative rotation angle, and then the segmented core transfer robot 13 stacks the segmented core 27 on the core positioning mold 11;

[0118] Among them, when the segmented iron core automatic rotation module 7 is set on the segmented iron core transfer robot 13, the segmented iron core transfer robot 13 grabs the segmented iron core 27, and then rotates the segmented iron core 27 by the said relative rotation angle and then stacks it on the iron core positioning mold 11; when the segmented iron core automatic rotation module 7 is set on the indexing plate of the workbench 12 of the press 8, the indexing plate drives the iron core positioning mold 11 to rotate by the said relative rotation angle, and then the segmented iron core transfer robot 13 stacks the grabbed segmented iron core 27 on the iron core positioning mold 11;

[0119] (8) Forming of the integral iron core: By repeating steps (1) to (7), a plurality of segmented iron cores 27 are stacked on the iron core positioning mold 11, and then the integral iron core 14 is formed on the iron core positioning mold 11 through pressing by the press 8.

[0120] The present embodiment adopts a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip. Each segmented core 27 does not need to be rotated when the core punching sheets are stacked. On the one hand, it ensures that the segmented core 27 that has not yet been firmly bonded will not undergo rotational inertial displacement after being exposed from under the segmented core tightening ring, thereby ensuring the accuracy of the stacking position of the core punching sheets, thereby improving the quality of the core manufacturing; on the other hand, it also saves the beat time of the tightening ring rotation, thereby improving the efficiency of the core manufacturing.

[0121] The present embodiment provides a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip, and is provided with a segmented core rotating and stacking mechanism. The segmented core 27 coming out of the segmented core tightening ring 3 is pre-marked with a fluorescent coating reference line on the upper surface of the segmented core 27 by a fluorescent directional marking device 6. After the segmented core 27 is transported to the segmented core rotating and stacking station 5 by a belt conveyor 15, the accurate position of the fluorescent coating reference line on the segmented core 27 is quickly identified by the mutual cooperation of an ultraviolet lamp 9 and a visual recognition camera 10. Then, the segmented core automatic rotating module 7 rotates the segmented core 27 and the core positioning mold 11 by a relative rotation angle, thereby improving the accuracy of the rotating and stacking of the segmented core 27, and further improving the quality of the overall core 14 after stacking.

[0122] The present embodiment provides a method for manufacturing a stator and rotor core by stamping a self-adhesive coating strip. After the segmented core 27 comes out of the segmented core tightening ring 3, the fluorescent coating reference line is marked. After being transported to the segmented core rotation stacking station 5, the fluorescent coating reference line is identified and the segmented core 27 is rotationally stacked. As a result, the position change of the segmented core 27 on the belt conveyor 15 will not affect its final rotation stacking accuracy.

[0123] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A temporary bonding point generator for making an iron core using a self-adhesive coating strip, characterized in that: The material strip used to make the stator and rotor core is a self-adhesive coating material strip, and the stator and rotor core stamping progressive die used to make the stator and rotor core is provided with a temporary bonding point generator for generating a plurality of temporary bonding points on the surface of the core punching sheet before stacking; the temporary bonding point generator includes a plurality of dispersedly distributed laser heating heads arranged on the stator and rotor core stamping progressive die for temporarily heating a plurality of local points on the self-adhesive coating material, and the laser heating direction of the laser heating head points to the surface of the core punching sheet.

2. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 1, characterized in that: A temporary heating station is arranged after the stamping station of the stator and rotor core stamping progressive die and before the blanking station, and the temporary bonding point generator is arranged on the temporary heating station.

3. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 1, characterized in that: The temporary bonding point generator is directly arranged on the blanking station of the stator and rotor core stamping progressive die.

4. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 3, characterized in that: A number of punch laser penetration holes are arranged on the blanking punch of the blanking station, and the laser heating head of the temporary bonding point generator is arranged at the rear of the blanking punch and is aligned with the punch laser penetration holes on the blanking punch.

5. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 2 or 3, characterized in that: When the self-adhesive coating tape is a self-adhesive coating tape with self-adhesive coating films on both sides, the laser heating direction of the laser heating head points to the upper surface or lower surface of the tape, or laser heating heads pointing to the upper surface and lower surface of the tape can be respectively arranged at the upper and lower positions of the tape.

6. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 2 or 3, characterized in that: When the self-adhesive coating strip is a self-adhesive coating strip with a self-adhesive coating film only on one or two sides, the arrangement scheme of the laser heating head adopts one of the following two arrangement schemes: the laser heating direction of the laser heating head points to the side of the strip on which the self-adhesive coating film is provided, so as to achieve local direct heating of the self-adhesive coating film; or the laser heating direction of the laser heating head points to the side of the strip on which the self-adhesive coating film is not provided, so as to achieve local indirect heating of the self-adhesive coating film through heat transfer between upper and lower adjacent core punchings when they are overlapped up and down.

7. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 1, characterized in that: The temporary bonding point generator also includes a temporary glue dispensing station arranged after the stamping station of the stator and rotor core stamping progressive die and before the blanking station. The temporary glue dispensing station is provided with a glue dispensing device for forming a number of dispersed and room temperature curing glue points on the material strip.

8. The temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 1, characterized in that: A number of the laser heating heads are divided into N groups, and the laser heating heads in each group are arranged at intervals along the same circular line, and the circular lines to which the laser heating heads in different groups belong are coaxial with each other.

9. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 8, characterized in that: A temperature controller for controlling the heating temperature of the self-adhesive coating film at the local point is also provided on the temporary heating station. The temperature controller includes a rotating laser mask plate driven to rotate by a servo motor and a number of mask plate laser penetration holes provided on the rotating laser mask plate. The number of mask plate laser penetration holes are divided into N groups. Each group of mask plate laser penetration holes are arranged at intervals according to the same circumferential line and the diameter of the circumferential line is the same as and coaxial with the diameter of the circumferential line of the laser heating head of the corresponding group. The laser heating head is arranged at the rear position of the rotating laser mask plate.

10. A temporary bonding point generator for making an iron core using a self-adhesive coating strip according to claim 8, characterized in that: The servo motor is a variable frequency speed regulation servo motor. By optimizing the number of mask laser penetration holes on the rotating laser mask and changing the rotation speed of the rotating laser mask by the variable frequency speed regulation servo motor, the amount of laser heating energy emitted to the material strip within a set time is adjusted, thereby achieving precise control of the heating temperature of local points on the material strip.

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