Punching equipment, sheet material punching method and motor core manufacturing method

Abstract

The present invention discloses a punching and cutting device, a punching and cutting method for sheets, and a method for manufacturing a motor core. The sheets include non-crystalline sheets, nanocrystalline sheets, and 0.05-0.15 mm thick silicon steel sheets and other magnetic ultra-thin materials. The punching and cutting device includes a lower mold, an upper mold matched with the lower mold, a lower mold pressing mechanism arranged on the lower mold for pressing the silicon steel strip so that the silicon steel strip is tightly fixed on the upper surface of the lower mold, and a punching machine driving mechanism connected to the upper mold to drive the upper mold to punch downward to punch out silicon steel sheets from the silicon steel strip and punch out ultra-thin iron-based sheets from ultra-thin iron-based sheets. The punching and cutting device of the present invention punches out ultra-thin iron-based sheets with the remaining part of the silicon steel strip after punching out the silicon steel sheets, thereby realizing a zero-to-zero punching process, reducing the requirements for the machining accuracy of machine tools and molds due to the thinness of the material to be sliced, and thereby reducing the punching cost of ultra-thin iron-based sheets.

Description

Technical Field

[0001] The invention relates to a punching and cutting device for a punching sheet, a punching and cutting method for a base sheet material and a method for manufacturing a motor iron core. Background Art

[0002] The stator core of the motor is the heart of the motor. Miniaturization, high efficiency, high power density, high frequency and high speed are the development trends of future motors. This puts higher requirements on the electromagnetic performance of the stator core. High-performance motors require the motor iron loss to be as small as possible (in order to reduce motor heating), so it is hoped that the core sheet is as thin as possible (to effectively reduce the eddy current loss of the core sheet) or a new core material is used. Core sheets are usually made of silicon steel sheets (silicon steel sheets) or ultra-thin iron-based sheets, hereinafter collectively referred to as sheets. For sheets with a thickness greater than 0.2mm, high-speed punching can be easily achieved, while for sheets with a thickness less than 0.2mm, especially ultra-thin iron-based sheets, the processing of such iron-based ultra-thin sheets (0.01-0.15mm) has become a major problem in achieving industrial production. In addition to being "thin", ultra-thin sheets are also "hard" and "brittle". Due to the special production process, the processability of iron-based ultra-thin sheets is very poor (for example, the hardness is increased by 5-6 times). At the same time, because the ultra-thin sheets are too thin, the processing accuracy of the mold is very high and difficult to achieve. If direct stamping is used, it will cause large burrs, tearing, unbroken, bending and other phenomena, making batch stamping impossible. The requirements for punch press accuracy, feeding fixing mechanism, mold matching accuracy, mold material, etc. are very high. The equipment is extremely difficult to implement, and the cost of equipment and iron core production is high, so it cannot be applied on a large scale.

[0003] Therefore, ultra-thin sheets are usually processed by wire cutting, but wire cutting has low efficiency. Firstly, it is difficult to mass produce. Secondly, the high-efficiency motors made of ultra-thin sheets are expensive and cannot be widely promoted. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a punching and cutting device, which uses the remaining part of the silicon steel strip after punching the silicon steel sheet to punch out the ultra-thin iron-based strip, thereby realizing a zero-to-zero punching process, reducing the requirements for the processing accuracy of machine tools and molds due to the thinness of the material to be sliced, and thus reducing the punching cost of ultra-thin iron-based sheets.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a punching and cutting device, which comprises:

[0006] Lower mold;

[0007] an upper mold matched with the lower mold;

[0008] A lower mold pressing mechanism disposed on the lower mold and used for pressing the silicon steel strip so that the silicon steel strip is closely fixed to the upper surface of the lower mold;

[0009] A punch press driving mechanism is connected to the upper die to drive the upper die to punch downward to punch silicon steel sheets from silicon steel strips and to punch ultra-thin iron-based sheets from ultra-thin iron-based strips.

[0010] Furthermore, the punching and cutting device further comprises:

[0011] A glue dispensing mechanism is arranged on the upper die and is used to press down the silicon steel punching sheet or the ultra-thin iron-based punching sheet after the upper die is punched downward, and to spray glue on the silicon steel punching sheet or the ultra-thin iron-based punching sheet;

[0012] A silicon steel strip feeding mechanism for feeding the silicon steel strip so that the silicon steel strip enters the silicon steel strip above the lower mold;

[0013] The invention is used for feeding the ultra-thin iron-based strip material so that the ultra-thin iron-based strip material enters the ultra-thin iron-based strip material feeding mechanism above the lower mold in a feeding manner.

[0014] The present invention also provides a sheet punching method, the method steps comprising:

[0015] The silicon steel strip is fixed closely to the upper surface of the lower mold, and the upper mold is punched downward to punch out the lower silicon steel punching sheet, and the remaining part of the silicon steel strip continues to be fixed closely to the upper surface of the lower mold to serve as the lower simulation mold;

[0016] The ultra-thin iron-based strip enters the top of the lower simulation die, and the upper die moves downward to punch and cut the ultra-thin iron-based punching sheet.

[0017] In order to further perform continuous punching on the ultra-thin iron-based strip, the ultra-thin iron-based strip is fed into the top of the lower simulation mold, and each time it is fed, the upper mold performs a punching.

[0018] Furthermore, the thickness of the silicon steel strip is 0.2-0.5 mm, and the thickness of the ultra-thin iron-based strip is 0.01-0.15 mm.

[0019] The present invention also provides a method for manufacturing a motor core, wherein the method steps include manufacturing a core lamination, wherein the method for manufacturing a core lamination includes:

[0020] Step S1: After the silicon steel strip enters the upper part of the lower mold, it is closely fixed on the upper surface of the lower mold, and the upper mold moves downward to punch and cut the lower silicon steel punching sheet, and the remaining part of the silicon steel strip continues to be closely fixed on the upper surface of the lower mold to serve as the lower simulation mold; wherein,

[0021] During the blanking process of silicon steel punching sheets, the glue dispensing mechanism moves downward to press against the silicon steel punching sheets, so that the silicon steel punching sheets are close to the receiving table, and glue is sprayed on the surface of the silicon steel punching sheets;

[0022] Step S2: The ultra-thin iron-based strip is fed into the upper part of the lower simulation mold. Each time it is fed, the upper mold performs a punching operation to punch out an ultra-thin iron-based punching sheet. The punching operation is repeated n times until the total thickness of the silicon steel punching sheet and the ultra-thin iron-based punching sheet stacked on the receiving table reaches a specified thickness or the lower simulation mold reaches the end of its service life.

[0023] During the blanking process of each ultra-thin iron-based punching sheet, the glue dispensing mechanism moves downward to press against the ultra-thin iron-based punching sheet so that the ultra-thin iron-based punching sheet is closely attached to the upper part of the previous punching sheet, and glue is sprayed on the surface of the ultra-thin iron-based punching sheet. The pressure applied by the glue dispensing mechanism on the ultra-thin iron-based punching sheet also flattens the glue on the surface of the previous punching sheet so as to bond the ultra-thin iron-based punching sheet to the previous punching sheet.

[0024] Step S3:

[0025] If the total thickness of the silicon steel punching sheets and ultra-thin iron-based punching sheets stacked on the material receiving table reaches the specified thickness, the silicon steel strip enters the upper part of the lower die again, and then is fixed tightly to the surface of the lower die. The upper die moves downward to punch and cut the silicon steel punching sheets;

[0026] During the blanking process of silicon steel punching sheets, the glue dispensing mechanism moves downward to press against the silicon steel punching sheets, so that the silicon steel punching sheets are closely attached to the upper part of the ultra-thin iron-based punching sheets of the previous cut. The pressure applied by the glue dispensing mechanism on the silicon steel punching sheets also flattens the glue on the surface of the ultra-thin iron-based punching sheets of the previous cut, so as to bond the silicon steel punching sheets with the ultra-thin iron-based punching sheets of the previous cut, thereby obtaining an iron core laminate.

[0027] If the total thickness of the silicon steel punching sheets and the ultra-thin iron-based punching sheets stacked on the receiving table does not reach the specified thickness, return to step S1.

[0028] Furthermore, the method steps also include:

[0029] The core laminations are laminated by a clamp;

[0030] The core stack clamped by the fixture is placed in a vacuum or atmosphere-protected annealing furnace for annealing;

[0031] Immerse the annealed core laminate in insulating glue, and after the core laminate is fully soaked, take out the core laminate and drain it;

[0032] The core stack after the insulating glue is drained is placed in a curing furnace for curing, and then the core stack is taken out and cooled to room temperature to obtain an iron core.

[0033] Further, the annealing temperature is 200-900 degrees, and the annealing time is 10-600 minutes;

[0034] And / or the curing temperature is 60~300 degrees, and the curing time is 10~600 minutes.

[0035] Furthermore, the core lamination wetting time is 10 to 1000 minutes.

[0036] Furthermore, the insulating glue is insulating varnish or epoxy resin or polyester imide varnish.

[0037] After adopting the above technical scheme, in the punching method of the sheet material of the present invention, the conventional silicon steel strip for punching the lower silicon steel sheet is used as the lower simulation mold, which effectively reduces the requirements for the processing accuracy of the machine tool and the mold due to the thinness of the sheet to be sliced, and the cooperation of the upper mold and the lower simulation mold is used to realize the zero-to-zero punching of the ultra-thin iron-based strip material, thereby reducing the punching cost of the ultra-thin iron-based strip material. However, considering the limitations of the hardness and thickness of the silicon steel strip material, it is bound to be greatly wasted after completing a limited number of punchings (1 to 200 times), so it is necessary to replace a new lower simulation mold to participate in the thin strip punching. In the process of replacing the lower simulation mold, the punching The lower silicon steel punching sheet also supports and protects the core lamination. In addition, the lower simulation mold can protect the lower mold, that is, the concave mold, to a certain extent, reducing the wear and grinding frequency of the lower mold. The present invention can realize batch processing of iron-based ultra-thin sheets (0.01~0.15mm), greatly reducing the processing cost, allowing ultra-thin iron-based alloy motors and ultra-thin silicon steel sheet motors to begin industrial production, improving production efficiency while greatly reducing the production cost of punching and cutting equipment and motors, which not only meets the national demand for energy conservation and emission reduction, but also can bring broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of the punching and cutting device of the present invention. DETAILED DESCRIPTION

[0039] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0040] Embodiment 1: In this embodiment, an ultra-thin iron-based strip material 20 with a thickness of 0.025±0.005 mm is used as an iron-based ultra-thin sheet material, and a conventional 0.35 mm thick silicon steel strip material 10 is used to assist in stamping. The specific method for manufacturing the motor core is as follows:

[0041] A normal 0.35mm non-oriented silicon steel sheet punching machine is used. The matching mold accuracy and the matching punching clearance of the upper and lower molds are set according to the needs. The upper mold 2 is driven up and down by the punch driving mechanism. The punch driving mechanism is an existing structure and will not be introduced in detail. The lower mold 1 has a lower mold pressing mechanism for fixing the silicon steel strip 10. The upper mold 2 has a glue dispensing mechanism for glue spraying and gluing and laminating between layers. The machine tool has a silicon steel strip feeding mechanism (feeding + pulling) and an ultra-thin iron-based strip feeding system (feeding + pulling).

[0042] The first step: the silicon steel strip 10 is above the lower mold 1 and is fed to the designated position for punching. Before blanking, the lower mold pressing mechanism presses the silicon steel strip 10 so that the silicon steel strip 10 is closely attached to the upper surface of the lower mold 1, and the blanking is performed. The glue dispensing port of the glue dispensing mechanism quickly presses down against the punched silicon steel sheet so that the silicon steel sheet is closely attached to the receiving table 3. The glue dispensing valve of the glue dispensing mechanism is opened to spray a certain amount of glue to form a glue point at the glue dispensing port position. The glue dispensing valve is closed, and the glue dispensing mechanism quickly rebounds and returns to the pre-punching position following the punching machine motion mechanism. The part of the silicon steel strip 10 that is punched by the lower silicon steel sheet continues to be closely attached to the surface of the lower mold 1 as a lower simulation mold to punch the ultra-thin iron-based strip.

[0043] Step 2: The silicon steel strip feeding mechanism does not move, the lower mold pressing mechanism does not move, the ultra-thin iron-based strip feeding mechanism starts to feed, and the ultra-thin iron-based strip 20 starts to be punched and cut above the silicon steel strip 10 in a feeding manner. After the ultra-thin iron-based strip 20 is punched and cut, the dispensing port quickly presses down against the ultra-thin iron-based punching sheet that is punched and cut, so that the ultra-thin iron-based punching sheet is closely attached to the silicon steel punching sheet of the previous cut. The pressure of the dispensing port flattens the glue on the surface of the silicon steel punching sheet of the previous cut and bonds the ultra-thin iron-based punching sheet to the silicon steel punching sheet. The dispensing valve is opened to spray a certain amount of glue again to form a dispensing point at the dispensing port position, and the dispensing valve is closed. The dispensing mechanism rebounds quickly and follows the punching machine motion mechanism back to the pre-punching position;

[0044] Step 3: The feeding mechanism of the silicon steel strip material does not move, the pressing mechanism of the lower mold does not move, the ultra-thin iron-based strip material 20 continues to feed above the silicon steel strip material 10, and the upper mold 2 starts punching after entering the predetermined punching position. After the ultra-thin iron-based strip material 20 is punched off, the dispensing port quickly presses down against the ultra-thin iron-based punching sheet that has been punched off, so that the ultra-thin iron-based punching sheet is closely attached to the ultra-thin iron-based punching sheet of the previous cut. The pressure of the dispensing port flattens the glue on the surface of the ultra-thin iron-based punching sheet of the previous cut and bonds it to the ultra-thin iron-based punching sheet this time. The dispensing valve is opened to spray a certain amount of glue again to form a dispensing point at the dispensing port position, and the dispensing valve is closed. The dispensing mechanism rebounds quickly and follows the punching machine motion mechanism back to the pre-punching position to prepare for the next punching;

[0045] Step 4: Repeat step 3 1 to 200 times to continuously stack the ultra-thin iron-based punching sheets. The number of repetitions is determined by the service life of the simulated mold.

[0046] Step 5: The lower mold pressing mechanism is released, and the silicon steel strip feeding mechanism feeds again, and the first step to the fourth step are repeated several times until the total thickness of the silicon steel punching sheets and ultra-thin iron-based punching sheets stacked on the receiving table 3 reaches the specified thickness;

[0047] Step 6: The lower mold pressing mechanism is released, and the silicon steel strip feeding mechanism feeds the material to the designated position again. After the upper mold 2 enters the pre-punching position, the lower mold pressing mechanism presses the silicon steel strip 10, so that the silicon steel strip 10 is close to the surface of the lower mold 1. After the upper mold 2 presses down to break the silicon steel strip 10, the glue point quickly presses down against the punched silicon steel sheet, so that the silicon steel sheet is close to the upper part of the ultra-thin iron-based sheet of the previous cut. The pressure of the glue point flattens the glue on the surface of the ultra-thin iron-based sheet of the previous cut and bonds it to the silicon steel sheet this time. The glue point mechanism rebounds quickly and follows the punching machine motion mechanism back to the pre-punching position, and the core lamination is completed;

[0048] Step 7: Repeat steps 1 to 6 to obtain multiple core stacks, and transport the core stacks to the stacking station through the core output mechanism of the machine tool, and stack the core stacks through the fixture to make the core stack size meet the requirements of the drawing;

[0049] Step 8: Place the core laminate clamped by the fixture into an annealing furnace with vacuum or atmosphere protection (which can be inert protective gas such as nitrogen, argon, etc.) for annealing at a temperature of 200°C and an annealing time of 600 minutes;

[0050] Step 9: Immerse the annealed core laminate in insulating glue (insulating paint, epoxy resin, polyester imide paint, water-based insulating paint, inorganic insulating paint and other adhesive glues) for 10 minutes to fully infiltrate the laminated layers of the core laminate, take out the core laminate and drain the insulating glue;

[0051] Step 10: Place the core laminate from which the insulating glue has been drained into a curing furnace for curing at a temperature of 60°C for 600 minutes. After curing, take out the core laminate and cool it to room temperature. The entire core processing is completed.

[0052] Embodiment 2: In this embodiment, an ultra-thin iron-based strip material 20 with a thickness of 0.1±0.005 mm is used as an iron-based ultra-thin sheet material, and a conventional 0.25 mm thick silicon steel strip material 10 is used to assist in stamping. The specific method for manufacturing the motor core is as follows:

[0053] A normal 0.25mm non-oriented silicon steel sheet punching machine is used. The matching mold accuracy and the matching punching clearance of the upper and lower molds are set according to the needs. The upper mold 2 is driven up and down by the punch driving mechanism. The punch driving mechanism is an existing structure and will not be introduced in detail. The lower mold 1 has a lower mold pressing mechanism for fixing the silicon steel strip 10. The upper mold 2 has a glue dispensing mechanism for glue spraying and gluing and laminating between layers. The machine tool has a silicon steel strip feeding mechanism (feeding + pulling) and an ultra-thin iron-based strip feeding system (feeding + pulling).

[0054] The first step: the silicon steel strip 10 is above the lower mold 1 and is fed to the designated position for punching. Before blanking, the lower mold pressing mechanism presses the silicon steel strip 10 so that the silicon steel strip 10 is closely attached to the upper surface of the lower mold 1, and the blanking is performed. The glue dispensing port of the glue dispensing mechanism quickly presses down against the punched silicon steel sheet so that the silicon steel sheet is closely attached to the receiving table 3. The glue dispensing valve of the glue dispensing mechanism is opened to spray a certain amount of glue to form a glue point at the glue dispensing port position. The glue dispensing valve is closed, and the glue dispensing mechanism quickly rebounds and returns to the pre-punching position following the punching machine motion mechanism. The part of the silicon steel strip 10 that is punched by the lower silicon steel sheet continues to be closely attached to the surface of the lower mold 1 as a lower simulation mold to punch the ultra-thin iron-based strip.

[0055] Step 2: The silicon steel strip feeding mechanism does not move, the lower mold pressing mechanism does not move, the ultra-thin iron-based strip feeding mechanism starts to feed, and the ultra-thin iron-based strip 20 starts to be punched and cut above the silicon steel strip 10 in a feeding manner. After the ultra-thin iron-based strip 20 is punched and cut, the dispensing port quickly presses down against the ultra-thin iron-based punching sheet that is punched and cut, so that the ultra-thin iron-based punching sheet is closely attached to the silicon steel punching sheet of the previous cut. The pressure of the dispensing port flattens the glue on the surface of the silicon steel punching sheet of the previous cut and bonds the ultra-thin iron-based punching sheet to the silicon steel punching sheet. The dispensing valve is opened to spray a certain amount of glue again to form a dispensing point at the dispensing port position, and the dispensing valve is closed. The dispensing mechanism rebounds quickly and follows the punching machine motion mechanism back to the pre-punching position;

[0056] Step 3: The feeding mechanism of the silicon steel strip material does not move, the pressing mechanism of the lower mold does not move, the ultra-thin iron-based strip material 20 continues to feed above the silicon steel strip material 10, and the upper mold 2 starts punching after entering the predetermined punching position. After the ultra-thin iron-based strip material 20 is punched off, the dispensing port quickly presses down against the ultra-thin iron-based punching sheet that has been punched off, so that the ultra-thin iron-based punching sheet is closely attached to the ultra-thin iron-based punching sheet of the previous cut. The pressure of the dispensing port flattens the glue on the surface of the ultra-thin iron-based punching sheet of the previous cut and bonds it to the ultra-thin iron-based punching sheet this time. The dispensing valve is opened to spray a certain amount of glue again to form a dispensing point at the dispensing port position, and the dispensing valve is closed. The dispensing mechanism rebounds quickly and follows the punching machine motion mechanism back to the pre-punching position to prepare for the next punching cut;

[0057] Step 4: Repeat step 3 1 to 50 times to continuously stack the ultra-thin iron-based punching sheets. The number of repetitions is determined by the service life of the simulation mold.

[0058] Step 5: The lower mold pressing mechanism is released, and the silicon steel strip feeding mechanism feeds again, and the first step to the fourth step are repeated several times until the total thickness of the silicon steel punching sheets and ultra-thin iron-based punching sheets stacked on the receiving table 3 reaches the specified thickness;

[0059] Step 6: The lower mold pressing mechanism is released, and the silicon steel strip feeding mechanism feeds the material to the designated position again. After the upper mold 2 enters the pre-punching position, the lower mold pressing mechanism presses the silicon steel strip 10, so that the silicon steel strip 10 is close to the surface of the lower mold 1. After the upper mold 2 presses down to break the silicon steel strip 10, the glue point quickly presses down against the punched silicon steel sheet, so that the silicon steel sheet is close to the upper part of the ultra-thin iron-based sheet of the previous cut. The pressure of the glue point flattens the glue on the surface of the ultra-thin iron-based sheet of the previous cut and bonds it to the silicon steel sheet this time. The glue point mechanism rebounds quickly and follows the punching machine motion mechanism back to the pre-punching position, and the core lamination is completed;

[0060] Step 7: Repeat steps 1 to 6 to obtain multiple core stacks, and transport the core stacks to the stacking station through the core output mechanism of the machine tool, and stack the core stacks through the fixture to make the core stack size meet the requirements of the drawing;

[0061] Step 8: Place the core laminate clamped by the fixture into a vacuum or atmosphere-protected (can be inert protective gas such as nitrogen, argon, etc.) annealing furnace for annealing at a temperature of 900°C and an annealing time of 10 minutes.

[0062] Step 9: Immerse the annealed core laminate in insulating glue (insulating paint, epoxy resin, polyester imide paint, water-based insulating paint, inorganic insulating paint and other adhesive glues) for 1000 minutes to fully infiltrate the laminated layers of the core laminate, take out the core laminate and drain the insulating glue;

[0063] Step 10: Place the core laminate from which the insulating glue has been drained into a curing furnace for curing at a temperature of 300°C for 10 minutes. After curing, take out the core laminate and cool it to room temperature. The entire core processing is completed.

[0064] Specifically, in the present invention, when the fourth step is operated for the first time, in the process of continuously stacking ultra-thin iron-based punching sheets, if the total thickness of the silicon steel punching sheets and ultra-thin iron-based punching sheets stacked on the receiving table 3 reaches the specified thickness, it is possible to directly jump to the sixth step to continue the operation. The motor core manufactured by the manufacturing method of the motor core of the present invention has a silicon steel punching sheet on the top and bottom layers respectively, and the ultra-thin iron-based punching sheet in the middle may or may not be sandwiched with a silicon steel punching sheet. The glue dispensing mechanism is connected to the upper mold 2 through a lifting drive mechanism, so that after the upper mold 2 descends to punch and cut the ultra-thin iron-based punching sheet or silicon steel punching sheet, the lifting drive mechanism drives the glue dispensing mechanism to descend to abut against the ultra-thin iron-based punching sheet or silicon steel punching sheet. The glue sprayed by the glue dispensing mechanism is a pressure-sensitive adhesive.

[0065] In the first and second embodiments, the ultra-thin iron-based sheet material is, for example but not limited to, amorphous sheet material, nanocrystalline sheet material, and 0.05-0.15 mm thick silicon steel sheet and other magnetic ultra-thin materials.

[0066] The working principle of the present invention is as follows:

[0067] In the sheet punching method of the present invention, a conventional silicon steel strip 10 for punching a lower silicon steel sheet is used as a lower simulation mold, which effectively reduces the requirements for the machining accuracy of the machine tool and the mold due to the thinness of the sheet to be sliced, and the cooperation of the upper mold 2 and the lower simulation mold is used to achieve zero-to-zero punching of the ultra-thin iron-based strip 20, thereby reducing the punching cost of the ultra-thin iron-based strip 20. However, considering that the hardness and thickness of the silicon steel strip 10 are limited, the loss is bound to be large after completing a limited number of punchings (1 to 200 times), so it is necessary to replace a new lower simulation mold to participate in the thin strip punching. In the process of replacing the lower simulation mold, the punching of the lower The silicon steel punching sheet also supports and protects the core lamination. In addition, the lower simulation mold can protect the lower mold 1, that is, the concave mold, to a certain extent, reducing the wear and grinding frequency of the lower mold 1. The present invention can realize batch processing of iron-based ultra-thin sheets (0.01~0.15mm), greatly reducing the processing cost, allowing ultra-thin iron-based alloy motors and ultra-thin silicon steel sheet motors to begin industrial production, improving production efficiency while greatly reducing the production cost of punching and cutting equipment and motors, which not only meets the national demand for energy conservation and emission reduction, but also can bring broad market prospects.

[0068] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A punching and cutting device, characterized in that: It includes: Lower mold (1); an upper mold (2) matched with the lower mold (1); A lower mold pressing mechanism disposed on the lower mold (1) and used to press the silicon steel strip (10) so that the silicon steel strip (10) is tightly fixed to the upper surface of the lower mold (1); A punching machine driving mechanism connected to the upper die (2) to drive the upper die (2) to punch downward to punch silicon steel sheets from the silicon steel strip (10) and to punch ultra-thin iron-based sheets from the ultra-thin iron-based strip (20); A silicon steel strip feeding mechanism for feeding a silicon steel strip (10) so that the silicon steel strip (10) enters the upper portion of the lower mold (1); wherein the silicon steel strip (10) is fixed closely to the upper surface of the lower mold (1), the upper mold (2) moves downward to punch and cut the lower silicon steel punching sheet, and the remaining portion of the silicon steel strip (10) continues to be fixed closely to the upper surface of the lower mold (1) to serve as a lower simulation mold; An ultra-thin iron-based strip material feeding mechanism is used for feeding the ultra-thin iron-based strip material (20) so that the ultra-thin iron-based strip material (20) enters the upper portion of the lower mold (1) in a feeding manner.

2. The punching and cutting device according to claim 1, characterized in that: Also includes: A glue dispensing mechanism is arranged on the upper mold (2) and is used to press down the silicon steel punching sheet or the ultra-thin iron-based punching sheet after the upper mold (2) is punched downward, and to spray glue on the silicon steel punching sheet or the ultra-thin iron-based punching sheet.

3. A sheet punching method, characterized in that: It is based on the punching and cutting device as claimed in claim 1, and the method steps include: The silicon steel strip (10) is fixed closely to the upper surface of the lower mold (1), and the upper mold (2) is moved downward to punch and cut the lower silicon steel punching sheet, and the remaining part of the silicon steel strip (10) continues to be fixed closely to the upper surface of the lower mold (1) to serve as the lower simulation mold; The ultra-thin iron-based strip material (20) enters the upper part of the lower simulation die, and the upper die (2) moves downward to punch and cut the lower ultra-thin iron-based punching sheet.

4. The sheet punching method according to claim 3, characterized in that: The ultra-thin iron-based strip material (20) is fed into the upper portion of the lower simulation die, and each time the ultra-thin iron-based strip material (20) is fed, the upper die (2) performs a punching operation.

5. The sheet punching method according to claim 3, characterized in that: The thickness of the silicon steel strip (10) is 0.2-0.5 mm, and the thickness of the ultra-thin iron-based strip (20) is 0.01-0.15 mm.

6. A method for manufacturing a motor core, characterized in that: It is based on the punching and cutting device of claim 2, wherein the method steps include manufacturing a core lamination, wherein the method for manufacturing the core lamination includes: Step S1: After the silicon steel strip (10) enters the upper part of the lower mold (1), it is closely fixed to the surface of the lower mold (1), and the upper mold (2) moves downward to punch and cut the lower silicon steel punching sheet, and the remaining part of the silicon steel strip (10) continues to be closely fixed to the upper surface of the lower mold (1) to serve as the lower simulation mold; wherein, During the blanking process of the silicon steel punching sheet, the glue dispensing mechanism moves downward to press against the silicon steel punching sheet, so that the silicon steel punching sheet is closely attached to the receiving table (3), and glue is sprayed on the surface of the silicon steel punching sheet; Step S2: The ultra-thin iron-based strip (20) is fed into the upper part of the lower simulation mold. Each time it is fed, the upper mold (2) performs a punching operation to punch out an ultra-thin iron-based punching sheet. The punching operation is performed n times until the total thickness of the silicon steel punching sheets and the ultra-thin iron-based punching sheets stacked on the receiving platform (3) reaches a specified thickness or the lower simulation mold reaches the end of its service life. During the blanking process of each ultra-thin iron-based punching sheet, the glue dispensing mechanism moves downward to press against the ultra-thin iron-based punching sheet so that the ultra-thin iron-based punching sheet is closely attached to the upper part of the previous punching sheet, and glue is sprayed on the surface of the ultra-thin iron-based punching sheet. The pressure applied by the glue dispensing mechanism on the ultra-thin iron-based punching sheet also flattens the glue on the surface of the previous punching sheet so as to bond the ultra-thin iron-based punching sheet to the previous punching sheet. Step S3: If the total thickness of the silicon steel punching sheets and the ultra-thin iron-based punching sheets stacked on the receiving table (3) reaches a specified thickness, the silicon steel strip (10) enters the top of the lower die (1) again, and is then tightly fixed to the surface of the lower die, and the upper die (2) moves downward to punch and cut the silicon steel punching sheets; wherein, During the blanking process of silicon steel punching sheets, the glue dispensing mechanism moves downward to press against the silicon steel punching sheets, so that the silicon steel punching sheets are closely attached to the upper part of the ultra-thin iron-based punching sheets of the previous cut. The pressure applied by the glue dispensing mechanism on the silicon steel punching sheets also flattens the glue on the surface of the ultra-thin iron-based punching sheets of the previous cut, so as to bond the silicon steel punching sheets with the ultra-thin iron-based punching sheets of the previous cut, thereby obtaining an iron core laminate. If the total thickness of the silicon steel punching sheets and the ultra-thin iron-based punching sheets stacked on the receiving table (3) does not reach the specified thickness, return to step S1.

7. The method for manufacturing a motor core according to claim 6, characterized in that: The method steps also include: The core laminations are laminated by a clamp; The core stack clamped by the fixture is placed in a vacuum or atmosphere-protected annealing furnace for annealing; Immerse the annealed core laminate in insulating glue, and after the core laminate is fully soaked, take out the core laminate and drain it; The core stack after the insulating glue is drained is placed in a curing furnace for curing, and then the core stack is taken out and cooled to room temperature to obtain an iron core.

8. The method for manufacturing a motor core according to claim 7, characterized in that: The annealing temperature is 200~900 degrees, and the annealing time is 10~600 minutes; And / or the curing temperature is 60~300 degrees, and the curing time is 10~600 minutes.

9. The method for manufacturing a motor core according to claim 7, characterized in that: The core lamination wetting time is 10~1000min.

10. The method for manufacturing a motor core according to claim 7, characterized in that: The insulating glue is insulating varnish or epoxy resin or polyester imide varnish.

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