A method for producing a laminated iron core

Abstract

A method for producing a laminated iron core designed by the present invention utilizes punching to form a plurality of thin plate groups and at least one retaining ring, wherein a dividing space exists between each thin plate of the thin plate group so that two adjacent thin plates in the radial direction are in a separated state, and each thin plate is provided with a first splicing portion and a second splicing portion, so that the first splicing portion and the second splicing portion are respectively provided on opposite sides of each dividing space in the thin plate group, and the matching shapes of the first splicing portion and the second splicing portion in each dividing space are adapted to each other; after the plurality of thin plate groups are stacked on each other, the thin plates in the axial direction correspond to each other and are stacked and connected to form an iron core monomer, so that the positioning portions of the thin plates corresponding to at least one retaining ring in each iron core monomer are respectively tightly fitted in the plurality of positioning grooves of the corresponding retaining ring, and then the iron core group is formed and then output from a continuous punching die; each iron core monomer is separated from the retaining ring, so that the output iron core group can be more convenient for winding or testing each iron core monomer one by one.

Description

Technical Field

[0001] The invention relates to the technical field of iron core manufacturing for new energy vehicle motors, and in particular to a method for producing a laminated iron core. Background Art

[0002] The motor of new energy vehicles is mainly composed of a motor rotor core and a motor stator core; at present, the motor stator core monomer is formed by stacking multiple iron core sheets, and the iron core sheets are whole-piece silicon steel sheets. Therefore, during production, a continuous punching die is used to continuously step-by-step punch the material strip to form multiple whole-piece iron core sheets, and stack them on each other. Since the formed iron core sheets are whole-piece, the stator tooth yoke parts in the formed stator core cannot be separated, resulting in difficulty in detecting the inner wall of the stator core and automated winding of the teeth. It can be seen that the integral and inseparable stator core often fails to detect its internal structure during inspection, resulting in defective products being returned after shipment. At the same time, the number of winding coils is often insufficient or too many, or the winding is disordered, and the winding efficiency is low. Therefore, there is an urgent need for a production method for stacked cores that can overcome such defects. Summary of the invention

[0003] The present invention is a method for producing a laminated iron core designed to solve the above-mentioned technical problems.

[0004] A method for producing a laminated iron core designed by the present invention comprises the following steps:

[0005] S1. Use a continuous punching die to perform continuous step-by-step punching on at least one row of punching areas in a thin strip material to form a plurality of thin plate groups and at least one retaining ring, wherein each thin plate group includes a plurality of thin plates arranged in an annular array, and there is a partition space between each thin plate so that two adjacent thin plates in the radial direction are separated, and each thin plate is provided with a first splicing portion and a second splicing portion, so that the first splicing portion and the second splicing portion are respectively provided on opposite sides of each partition space in the thin plate group, and the matching shapes of the first splicing portion and the second splicing portion in each partition space are adapted to each other;

[0006] After the plurality of thin plate groups are stacked, the thin plates in the axial direction correspond to each other and are stacked and connected to form an iron core monomer, so that the clamping parts of the thin plates corresponding to at least one retaining ring in each iron core monomer are respectively tightly fitted in the plurality of clamping grooves of the corresponding retaining ring, and then the iron core group is formed and output from the continuous blanking die, and enters step S2;

[0007] S2. Separate each core unit in the core group from the retaining ring so that each core unit forms an independent product to be assembled.

[0008] According to the above-mentioned method for producing a laminated iron core, in step S1:

[0009] S11, punching and forming a plurality of slot-shaped holes arranged in a circular array at the edge of the reserved hole, with the inner end of each slot-shaped hole close to the edge of the reserved hole;

[0010] S12, punching out an outer hole in the area beside the outer end of each slot-shaped hole, and the inner end of the outer hole is connected to the outer end of the slot-shaped hole and the two are interconnected, and the two opposite sides of the outer hole in the width direction are respectively a first joint part and a second joint part, the first joint part is formed with a concave part, and the second joint part is formed with a convex part adapted to the concave part;

[0011] S13, punching is performed along the inner end of each slot-shaped hole to form a stator inner hole and a ring-shaped waste material, and the punched-out ring-shaped waste material falls as waste material, so that a slot-shaped opening is formed at the inner end of each slot-shaped hole, so that the slot-shaped hole is connected with the stator inner hole; or

[0012] Punching is performed along the inner end of each slot-shaped hole to form a stator inner hole and a retaining ring, and a slot-shaped opening is formed at the inner end of each slot-shaped hole, and the punched retaining ring is pushed back into the stator inner hole, and a plurality of protrusions on the retaining ring are respectively tightly fitted in each slot-shaped opening, so that the clamping portion between each two adjacent slot-shaped openings is also respectively tightly fitted in each clamping groove on the retaining ring, and the stator inner hole and retaining ring forming step is an independent punching step or combined with step S12 into one punching step;

[0013] S14. Punching is performed along the outer end of the outer shape hole to form a thin plate group with a retaining ring or a thin plate group without a retaining ring, so that multiple thin plate groups without retaining rings and at least one thin plate group with a retaining ring are stacked on each other in the blanking channel to form at least one iron core group, and a dividing opening is formed after the outer end of the outer shape hole is punched to form a dividing space in the thin plate group.

[0014] According to the above-mentioned method for producing a laminated iron core, a core buckle point forming step is further included between step S13 and step S14, which step is: selectively punching and forming at least one core buckle point in the side area of ​​the outer shape hole and / or the slot hole, so that after the plurality of thin plate groups are stacked on each other, the thin plates in the axial direction are buckled through the core buckle point;

[0015] Between step S11 and step S12, there is also a core through-hole forming step, which is: at least one core through-hole is selectively punched and formed in the side area of ​​the outer shape hole and / or the slot hole, and the position of the core through-hole corresponds to the position of the core buckle point, and after a core is formed, the thin plate with the core through-hole is located at the end of the core unit.

[0016] According to the method for producing a laminated iron core described above, a glue coating step is also included between step S13 and step S14, which step is: selectively coating glue on the side areas of the outer hole and / or the slot hole, so that after multiple thin plate groups are stacked on each other, the thin plates in the axial direction are bonded by glue.

[0017] According to the above-described method for producing a laminated iron core, in step S13, after the stator inner hole is formed, the retaining ring is punched down and pushed back into the stator inner hole. The device used is a recoil forming device, which includes a punching punch and a punching die adapted to the shapes of the retaining ring and the stator inner hole, a top block located in the punching hole of the punching die, and a push-back reset mechanism located below the top block, the upper end of the push-back reset mechanism is connected to the top block, and the punching punch is installed on the upper die of the continuous punching die, and the punching die, the top block and the push-back reset mechanism are all installed on the lower die of the continuous punching die.

[0018] According to the above-mentioned method for producing a laminated iron core, the recoil forming device also includes a weight-reducing spring, a connecting bolt, a plate drawing back plate and a punch plate drawing. A plate drawing cavity, a first channel and a second channel with an inner diameter larger than the first channel are provided in the upper die of the continuous punching die. The upper end of the punching punch is placed in the second channel and the lower end thereof is placed in the first channel. A plate drawing back plate is fixedly installed in the plate drawing cavity. The punch plate drawing is slidably installed on the bottom surface of the plate drawing back plate, and the bottom surface of the punch plate drawing is in contact with the top surface of the punching punch. A plurality of trapezoidal grooves and a plurality of trapezoidal protrusions arranged at intervals are provided on the bottom surface of the punch plate drawing and the top surface of the punching punch. The connecting bolts are inserted into the continuous punching die. The upper part of the upper die of the blanking die and its lower end pass through the drawer back plate and are connected to the top surface of the blanking punch. The weight-reducing spring is sleeved on the connecting bolt, and its two ends respectively contact the drawer back plate and the head of the connecting bolt. When it is necessary to form a retaining ring, the trapezoidal protrusion of the punch drawer and the trapezoidal protrusion of the blanking punch contact each other to fix the blanking punch, and the limiting step in the middle of the blanking punch is limited on the limiting surface between the first channel and the second channel, so that the blanking punch can realize the blanking of the retaining ring. When it is not necessary to form a retaining ring, the trapezoidal protrusion is fitted into the trapezoidal groove, and the blanking punch rises and retreats under the action of the weight-reducing spring, thereby realizing the selective blanking of the retaining ring.

[0019] According to the above-mentioned method for producing a laminated iron core, the push-back reset mechanism includes a push rod, a push plate, a push-back spring, a fixing plate, a positioning column and a positioning rod. The lower die of the continuous punching die is provided with a cavity, a die mounting hole and a depression located below the die mounting hole. The punching die is installed in the die mounting hole. The depression corresponds to the position of the push block, and the inner diameter of the depression is larger than the outer diameter of the push block. The push rod is movably arranged in the lower die of the continuous punching die. The push plate and the push-back spring are both arranged in the cavity. The two ends of the push-back spring are respectively in contact with the bottom surface of the top plate and the inner bottom surface of the cavity. The upper end of the push rod is connected to the top block. The upper end of the positioning column is fixed to the top block, the inner bottom surface of the depression is provided with a guide channel, the lower end of the positioning column is placed in the guide channel, the fixing plate is fixed to the inner bottom surface of the cavity, the lower end of the push-back spring is in contact with the top surface of the fixing plate, the positioning rod is fixed to the top plate, and the lower end of the push-back spring is movably arranged on the fixing plate; when the punching punch is punched down, the top block is pressed to compress the push-back spring and the top block moves down, and when the punching punch gradually moves up, the push-back spring is also gradually expanded, and the top block is also gradually moved up to push the retaining ring back into the inner hole of the stator.

[0020] According to the above-described method for producing a laminated iron core, in step S2, each core unit on the retaining ring is radially translated outward by pulling to separate each core unit from the retaining ring, or the retaining ring is radially deformed inward by pushing to separate each core unit from the retaining ring.

[0021] According to the above-mentioned method for producing a laminated core, before step S1, a rotor core forming step S0 is also included, which is as follows:

[0022] The thin strip is continuously punched by a continuous punching die to form a plurality of process holes arranged in an annular array in a forming area of ​​the thin strip;

[0023] Punching and forming a plurality of first V-shaped magnetic steel grooves in a forming area of ​​the thin strip material, wherein the plurality of first V-shaped magnetic steel grooves are respectively located in an area outside each process hole;

[0024] Punching and forming a plurality of second V-shaped magnetic steel grooves in the forming area of ​​the thin strip material, and each second V-shaped magnetic steel groove is respectively located between the plurality of first V-shaped magnetic steel grooves;

[0025] The rotor iron core sheets are formed and blanked along the outer areas of the first V-shaped magnetic steel groove and the second V-shaped magnetic steel groove. In the continuous forming process, multiple rotor iron core sheets are stacked on each other to form the rotor core, and reserved holes are formed on the thin strip material.

[0026] According to the above-mentioned method for producing a laminated iron core, before the step of blanking the rotor iron core sheets, a step of forming a rotor buckle point and a rotor shaft hole is further included, wherein the rotor shaft hole and the rotor buckle point are punched and formed in the forming area of ​​the thin strip material, and the rotor buckle point is located in the side area of ​​the rotor shaft hole, the process hole, the first V-shaped magnetic steel groove or the second V-shaped magnetic steel groove, so that the rotor iron core sheets in the rotor core are buckled through the rotor buckle point;

[0027] Before the rotor buckle point forming step, a rotor through-sheet hole forming step is also included, which step is: at least one rotor through-sheet hole is punched and formed in the side area of ​​the rotor shaft hole, the process hole, the first V-shaped magnetic steel slot or the second V-shaped magnetic steel slot, and the position of the rotor through-sheet hole corresponds to the position of the rotor buckle point, and after a rotor core is formed, the rotor iron core sheet with the rotor through-sheet hole is located at the end of the rotor core.

[0028] According to the above-described method for producing a laminated iron core, the number of shapes formed in step S12 is an even number, so that the number of thin plates and dividing spaces in the thin plate group formed in step S14 are also an even number, and the number of thin plates in the thin plate group is equal to the number of dividing spaces; in step S14, the stacked thin plate group locked in the blanking channel is rotated 360° / N, where N is a positive integer.

[0029] The method for producing a laminated iron core designed by the present invention has the following beneficial effects:

[0030] 1. The present invention allows each core unit to be separated before the stator core is formed, so after separation, it is convenient to wind or test each core unit one by one.

[0031] 2. The setting of the retaining ring can ensure that each core unit in a core group is connected to the retaining ring when discharging from the continuous punching die, so as to achieve the effect of overall discharging, thereby avoiding the phenomenon of product damage caused by bulk material delivery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the layout diagram of the laminated core production process (I).

[0033] Figure 2 This is the layout diagram of the laminated core production process (Part 2).

[0034] Figure 3 This is an enlarged view of point A.

[0035] Figure 4 It is a schematic diagram of the structure of the thin plate group without a retaining ring.

[0036] Figure 5 It is a schematic diagram of the structure of a thin plate group with a retaining ring.

[0037] Figure 6 It is a structural schematic diagram of at least one thin plate group with a retaining ring and a plurality of thin plate groups without retaining rings stacked on each other to form an iron core group.

[0038] Figure 7 It is a schematic diagram of the structure in which the core monomer is pulled radially outward.

[0039] Figure 8 It is a schematic diagram of the structure of the radially inward extrusion retaining ring.

[0040] Fig. 9 It is a structural schematic diagram of a continuous punching die.

[0041] Fig.10 It is a schematic diagram of the local structure (I).

[0042] Fig.11 This is a schematic diagram of the local structure (II).

[0043] In the figure: 1, process hole; 2, first V-shaped magnetic steel slot; 3, second V-shaped magnetic steel slot; 4, rotor through-piece hole; 5, rotor buckle point; 6, rotor iron core sheet; 7, reserved hole; 8, slot hole; 9, iron core through-piece hole; 10, outer hole; 11, ring-shaped waste; 12, iron core buckle point; 13, thin plate group; 14, retaining ring; 15, stator inner hole; 16, rotor shaft hole; 81, slot opening; 101, First joint part; 102, second joint part; 103, concave part; 104, convex part; 131, thin plate; 132, clamping part; 133, dividing space; 134, dividing opening; 141, protrusion; 142, clamping groove; 100, thin strip material; 200, core group; 201, core monomer; 300, continuous punching die; 301, upper die; 302, lower die; 303, punching punch; 3 04, punching die; 305, top block; 306, upper die seat; 307, upper pad; 308, convex fixing plate; 309, stripper plate seat; 310, stripper plate; 311, first channel; 312, second channel; 313, limiting step; 314, limiting surface; 315, drawer back plate; 316, punch drawer; 317, connecting bolt; 318, weight reduction spring; 319, trapezoidal protrusion; 3 20. Trapezoidal groove; 321. Lower mold plate; 322. Lower mold base; 323. Concave fixing plate; 324. Concave mold mounting hole; 325. Ejector rod; 326. Guide channel; 327. Positioning column; 328. Recess; 329. Ejector plate; 330. Cavity; 331. Push-back spring; 332. Positioning rod; 333. Fixing plate; 334. Blanking channel; 335. Hydraulic cylinder; 336. Plate extraction cavity. DETAILED DESCRIPTION

[0044] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0045] like Figure 1-Figure 3 As shown, a method for producing a laminated core described in this embodiment includes the following steps:

[0046] S1. Use a continuous punching die 300 to perform continuous step-by-step punching on at least one row of punching areas of the thin strip material 100 (the punching areas can be one row, two rows or three rows) to form a plurality of thin plate groups 13 and at least one retaining ring 14. Each thin plate group 13 includes a plurality of thin plates 131 arranged in a circular array, and there is a dividing space 133 between each thin plate 131 so that two adjacent thin plates 131 in the radial direction are in a separated state. Each thin plate 131 is provided with a first splicing portion 101 and a second splicing portion 102 so that the first splicing portion 101 and the second splicing portion 102 are respectively provided on opposite sides of each split space 133 in the thin plate group 13, and the matching shapes of the first splicing portion 101 and the second splicing portion 102 in each split space 133 are adapted to each other. The specific forming steps are as follows.

[0047] S11 , punching and forming a plurality of slot-shaped holes 8 arranged in a circular array at the edge of the reserved hole 7 , with the inner end of each slot-shaped hole 8 close to the edge of the reserved hole 7 .

[0048] S12. A profile hole 10 is punched out in the area beside the outer end of each slot hole 8, and the inner end of the profile hole 10 is connected to the outer end of the slot hole 8 and the two are interconnected, and the opposite sides of the profile hole 10 in the width direction are respectively a first joint portion 101 and a second joint portion 102, a recess 103 is formed on the first joint portion 101, and a protrusion 104 adapted to the recess 103 is formed on the second joint portion 102; wherein the recess 103 and the protrusion 104 are both arc-shaped structures, triangular structures or square structures.

[0049] S13, punching is performed along the inner end of each slot-shaped hole 8 to form a stator inner hole 15 and a ring-shaped waste material 11, and the punched-out ring-shaped waste material 11 falls as waste material, so that a slot-shaped opening 81 is formed at the inner end of each slot-shaped hole 8, so that the slot-shaped hole 8 is connected to the stator inner hole 15. Alternatively, punching is performed along the inner end of each slotted hole 8 to form the stator inner hole 15 and the retaining ring 14, and a slotted opening 81 is formed at the inner end of each slotted hole 8, and the punched-out retaining ring 14 is pushed back into the stator inner hole 15, and the multiple protrusions 141 on the retaining ring 14 are respectively tightly fitted in each slotted opening 81, so that the locking portions 132 between each two adjacent slotted openings 81 are also respectively tightly fitted in each locking groove 142 on the retaining ring 14, wherein the forming of the outer hole 10, the stator inner hole 15 and the retaining ring 14 can be combined into one punching step, or the forming of the stator inner hole 15 and the retaining ring 14 can be an independent punching step.

[0050] S14, punching along the outer end of the outer hole 10 to form a thin plate group 13 with a retaining ring 14 or a thin plate group 13 without a retaining ring 14, so that a plurality of thin plate groups 13 without retaining rings 14 and at least one thin plate group 13 with a retaining ring 14 are stacked on each other in the blanking channel 334 to form at least one iron core group 200, and the outer end of the outer hole 10 is punched to form a split opening 134 so that a split space 133 in the thin plate group 13 is formed, see Figure 4 and Figure 5 shown.

[0051] Therefore, after the thin plate group 13 is continuously formed and falls into the blanking channel 334, the multiple thin plate groups 13 are stacked on each other, so that the thin plates 131 in the axial direction correspond to each other and are stacked and connected to form the iron core monomer 201, so that the locking parts 132 of the thin plates 131 corresponding to at least one retaining ring 14 in each iron core monomer 201 are respectively tightly fitted in the multiple locking grooves 142 of the corresponding retaining ring 14, and then the iron core group 200 is formed and output from the continuous punching die 300 and enters step S2; wherein, when the thin plate group 13 is stacked, it is supported by the cylinder or hydraulic cylinder 335 in the blanking channel 334 to provide back pressure, so that the multiple thin plate groups 13 are stacked and connected, and the retaining ring 14 can be in the middle, one end or both ends of the iron core group 200, or there can be retaining rings 14 in the middle and both ends of the iron core group 200, please refer to Figure 6 shown.

[0052] S2, separate each core unit 201 in the core group 200 from the retaining ring 14, so that each core unit 201 forms an independent product to be assembled; wherein, Figure 7 As shown, during separation, each core monomer 201 on the core assembly 200 can be pulled radially outward to make each core monomer 201 on the retaining ring 14 translate radially outward to separate each core monomer 201 from the retaining ring 14, or as shown in FIG. Figure 8 As shown, the retaining ring 14 is deformed radially inward by pushing the retaining ring 14 radially inward, so that each core monomer 201 is separated from the retaining ring 14 .

[0053] In this embodiment, between step S13 and step S14, there is also a step of forming a core buckle point 12, which is: selectively punching and forming at least one core buckle point 12 in the side area of ​​the outer hole 10 and / or the slot hole 8, so that after the plurality of thin plate groups 13 are stacked, the thin plates 131 in the axial direction are buckled through the core buckle point 12. And

[0054] The step of forming the core through-hole 9 is also included between step S11 and step S12, and the step is: at least one core through-hole 9 is selectively punched and formed in the side area of ​​the outer shape hole 10 and / or the slotted hole 8, and the position of the core through-hole 9 corresponds to the position of the core buckle point 12, and after a core group 200 is formed, the thin plate 131 with the core through-hole 9 is located at the end of the core monomer 201.

[0055] In the above, the core buckle points 12 are used to make the connection between the thin plates 131 more secure, but it can also be replaced by coating adhesive so that the thin plates 131 are bonded and fixed by adhesive. When the adhesive coating process is used, the core through-hole 9 forming step can be omitted, and the adhesive coating step is: an adhesive coating step is also included between step S13 and step S14, and adhesive is selectively coated on the side areas of the outer hole 10 and / or the slot hole 8, so that after multiple thin plate groups 13 are stacked on each other, the thin plates 131 in the axial direction are bonded by adhesive. When the number of stacked thin plates 131 reaches the preset requirement, the adhesive coating is suspended to separate the two adjacent core groups 200.

[0056] like Figure 9-11As shown, in this embodiment, the device used in step S13 for punching down the retaining ring 14 and pushing it back into the stator inner hole 15 after the stator inner hole 15 is formed is a recoil forming device, and the device used in step S13 for punching down the ring-shaped waste material 11 after the stator inner hole 15 is formed is an inner hole forming device, the recoil forming device includes a punching punch 303 and a punching die 304 adapted to the shapes of the retaining ring 14 and the stator inner hole 15, a top block 305 located in the punching hole of the punching die 304, and a push-back reset mechanism located below the top block 305, the upper end of the push-back reset mechanism is connected to the top block 305; wherein the punching punch 303 is installed on a continuous The upper die 301 of the punching die 300, the punching die 304, the top block 305 and the push-back reset mechanism are all installed on the lower die 302 of the continuous punching die 300. Therefore, during punching, the upper die 301 and the lower die 302 of the continuous punching die 300 are closed, so that the punching punch 303 and the punching die 304 cooperate with each other to form the stator inner hole 15 on the thin strip 100, and the retaining ring 14 is also punched down; when the punching is completed, the upper die 301 and the lower die 302 of the continuous punching die 300 are opened, so that the punching punch 303 is away from the retaining ring 14. At this time, the push-back reset mechanism pushes the top block 305 to move upward to push the retaining ring 14 back to the stator inner hole 15.

[0057] Specifically, Fig.10 and Fig.11As shown, the upper die 301 of the continuous punching die 300 includes an upper die seat 306, an upper pad 307, a convex fixing plate 308, a stripper plate seat 309 and a stripper plate 310 from top to bottom, the upper die seat 306, the upper pad 307, the convex fixing plate 308, the stripper plate seat 309 and the stripper plate 310 are fixed to each other, the recoil forming device also includes a weight-reducing spring 318, a connecting bolt 317, a draw plate back plate 315 and a punch draw plate 316, the through hole of the stripper plate seat 309 is coaxially arranged with the through hole of the stripper plate 310 and forms a first A channel 311, the through hole of the upper pad 307 is coaxially arranged with the through hole of the convex fixing plate 308 to form a second channel 312 whose inner diameter is larger than the first channel 311, the upper end of the punching punch 303 is placed in the second channel 312, and the lower end thereof is placed in the first channel 311, a draw plate back plate 315 is fixedly installed in the draw plate cavity 336 of the upper die seat 306, a convex draw plate 316 is slidably installed on the bottom surface of the draw plate back plate 315, and the bottom surface of the convex draw plate 316 is in conflict with the top surface of the punching punch 303, and the convex draw plate The bottom surface of the upper die 316 and the top surface of the punching punch 303 are both provided with a plurality of trapezoidal grooves 320 and a plurality of trapezoidal protrusions 319 arranged at intervals. The connecting bolt 317 is inserted into the upper die seat 306, and its lower end passes through the draw plate back plate 315 and is connected to the top surface of the punching punch 303. The weight-reducing spring 318 is sleeved on the connecting bolt 317, and its two ends are respectively in conflict with the draw plate back plate 315 and the head of the connecting bolt 317. When the retaining ring 14 needs to be formed, the trapezoidal protrusion 319 of the punch draw plate 316 is 9 contacts with the trapezoidal protrusion 319 of the punching punch 303 to fix the punching punch 303, and the limiting step 313 in the middle of the punching punch 303 is limited to the top surface of the stripper plate seat 309 (i.e., the limiting surface 314), so that the punching punch 303 can realize the punching of the retaining ring 14. When the retaining ring 14 is not needed to be formed, the trapezoidal protrusion 319 is matched into the trapezoidal groove 320, and the punching punch 303 rises and retreats under the action of the weight-reducing spring 318, so as to realize the selective punching of the retaining ring 14.

[0058] like Fig.11As shown, the lower die 302 of the continuous punching die 300 includes a lower die plate 321, a lower die seat 322 and a concave fixing plate 323 from bottom to top, and the lower die plate 321, the lower die seat 322 and the concave fixing plate 323 are also fixed to each other; the push-back reset mechanism includes a push rod 325, a push plate 329 and a push-back spring 331, the punching die 304 is installed in the die mounting hole 324 of the concave fixing plate 323, the top surface of the lower die seat 322 is provided with a recess 328 corresponding to the position of the ejector block 305, the inner diameter of the recess 328 is larger than the outer diameter of the ejector block 305, the push rod 325 is movably arranged in the lower die seat 322, the push plate 329 and the push-back spring 331 are both arranged in the cavity 330 of the lower die plate 321, and the two ends of the push-back spring 331 are respectively connected to the ejector plate 329 The bottom surface of the cavity 330 of the lower template 321 contacts the inner bottom surface, the upper end of the push rod 325 is connected to the ejector block 305, and the lower end thereof contacts the top surface of the ejector plate 329; when the punching punch 303 punches down, it presses the ejector block 305 to compress the push-back spring 331, and the ejector block 305 moves downward; when the punching punch 303 gradually moves upward, the push-back spring 331 is also gradually expanded, and the ejector block 305 also gradually moves upward to push the retaining ring 14 back into the stator inner hole 15; the push-back spring 331 adopts a compression spring, and when the retaining ring 14 is clamped into the stator inner hole 15, the retaining ring 14 is clamped by the punching punch 303 and the ejector block 305, so that the retaining ring 14 is more accurately and stably positioned in the stator inner hole 15.

[0059] The inner hole forming device also has a punching punch 303, a punching die 304, a weight-reducing spring 318, a connecting bolt 317, a draw-off plate back plate 315 and a punch draw-off plate 316 which have the same shapes as the parts in the above-mentioned recoil forming device, and the punching punch 303, the punching die 304, the weight-reducing spring 318, the connecting bolt 317, the draw-off plate back plate 315 and the punch draw-off plate 316 have the same structure, installation position and action principle as the punching punch 303, the punching die 304, the weight-reducing spring 318, the connecting bolt 317, the draw-off plate back plate 315 and the punch draw-off plate 316 in the recoil forming device. The difference between the inner hole forming device and the recoil forming device is that the inner hole forming device is not provided with a push-back reset mechanism.

[0060] Preferably, the push-back reset mechanism also includes a fixing plate 333, a positioning column 327 and a positioning rod 332, the upper end of the positioning column 327 is fixed to the top block 305, the inner bottom surface of the recess 328 is provided with a guide channel 326, the lower end of the positioning column 327 is placed in the guide channel 326, the fixing plate 333 is fixed to the inner bottom surface of the cavity 330 of the lower template 321, the lower end of the push-back spring 331 is in contact with the top surface of the fixing plate 333, the positioning rod 332 is fixed on the top plate 329, and its lower end is movably arranged on the fixing plate 333; its structural setting makes the lifting and lowering displacement of the top block 305 more stable, so that the top block 305 is always kept in a horizontal state when it is raised to avoid deflection.

[0061] In this embodiment, the number of shapes formed in step S12 is an even number, and in step S14, the stacked thin plate group 13 locked in the blanking channel 334 is rotated 360° / N, N is a positive integer, generally N is 2, 3, 4, 6 or 12, etc.; so that the number of thin plates 131 and the number of dividing spaces 133 in the thin plate group 13 formed in step S14 are also an even number, and the number of thin plates 131 in the thin plate group 13 is equal to the number of dividing spaces 133, wherein the number of thin plates 131 in the thin plate group 13 and the number of dividing spaces 133 are preferably 12, so that the stacked thin plate group 13 locked in the blanking channel 334 can be rotated 30°, 60°, 90°, 120° or 180°, etc., and the flatness difference of the thin plate 131 is compensated after rotation, so that the height difference of each part of the core monomer 201 is reduced, and the quality of each core monomer 201 is improved.

[0062] like Figure 1-Figure 3 As shown, in this embodiment, before step S1, a rotor core forming step S0 is also included, which is as follows:

[0063] The thin strip material 100 is continuously and step-by-step punched by a continuous punching die 300 , so as to form a plurality of process holes 1 arranged in an annular array in a forming area of ​​the thin strip material 100 .

[0064] A plurality of first V-shaped magnetic steel grooves 2 are punched and formed in the forming area of ​​the thin strip material 100 , and the plurality of first V-shaped magnetic steel grooves 2 are respectively located in the area outside each process hole 1 .

[0065] A plurality of second V-shaped magnetic steel grooves 3 are punched and formed in the forming area of ​​the thin strip material 100 , and each second V-shaped magnetic steel groove 3 is located between the plurality of first V-shaped magnetic steel grooves 2 .

[0066] The rotor shaft hole 16 and the rotor buckle point 5 are punched out in the forming area of ​​the thin strip 100, and the rotor buckle point 5 is located in the side area of ​​the rotor shaft hole 16, the process hole 1, the first V-shaped magnetic steel slot 2 or the second V-shaped magnetic steel slot 3; the punching of the rotor buckle point 5 in this step can also be replaced by coating with adhesive, so as to prepare for the connection between the rotor iron core sheets 6 in the form of adhesive bonding. When the adhesive coating step is adopted, the punching of the rotor through-sheet hole 4 is cancelled, and when the adhesive is coated, the side area of ​​the rotor shaft hole, the process hole 1, the first V-shaped magnetic steel slot 2 or the second V-shaped magnetic steel slot 3 is selectively coated with adhesive while the rotor shaft hole is punched out. When the number of rotor iron core sheets 6 stacked in a rotor core reaches the preset requirement, the adhesive coating is cancelled, so that the two adjacent rotor cores are prepared to be in a separated state after forming.

[0067] The rotor core sheets 6 are formed by punching along the outer areas of the first V-shaped magnetic steel groove 2 and the second V-shaped magnetic steel groove 3, and the rotor core sheets 6 are stacked on each other to form the rotor core during the continuous forming process, and the core sheets in the rotor core are fastened by rotor buckle points 5 or bonded by adhesive, and at the same time, a reserved hole 7 is formed on the thin strip material 100, and the reserved hole 7 is circular.

[0068] Preferably, before the rotor buckle point 5 forming step, a rotor through-sheet hole 4 forming step is also included, which step is: selectively punching and forming at least one rotor through-sheet hole 4 in the side area of ​​the rotor shaft hole, the process hole 1, the first V-shaped magnetic steel slot 2 or the second V-shaped magnetic steel slot 3, and the position of the rotor through-sheet hole 4 corresponds to the position of the rotor buckle point 5, and after a rotor core is formed, the rotor iron core sheet 6 with the rotor through-sheet hole 4 is located at the end of the rotor core; this step will only start punching and forming the rotor through-sheet hole 4 when the stacking number of rotor iron core sheets 6 in a rotor core reaches a preset requirement, and the punching of the rotor buckle point 5 is suspended, so that the two adjacent rotor cores are in a separated state, and this step is only used when the rotor buckle point 5 is formed.

[0069] Among them, the process of combining the rotor core forming step with the core group 200 forming step can be realized after a continuous punching die 300 punches out a thin strip material 100, so that the coaxial accuracy is higher when the rotor core is assembled into the rotor core formed by splicing the core monomers 201 in the core group 200, further improving the motor operation performance.

Claims

1. A method for producing a laminated iron core, characterized in that: The steps include: S1. Utilizing a continuous punching die (300) to perform continuous step-by-step punching on at least one row of punching areas in a thin strip material (100) to form a plurality of thin plate groups (13) and at least one retaining ring (14), wherein each thin plate group (13) comprises a plurality of thin plates (131) arranged in an annular array, and a partition space (133) is provided between each thin plate (131) so that two adjacent thin plates (131) in a radial direction are in a separated state, and each thin plate (131) is provided with a first splicing portion (101) and a second splicing portion (102), so that each of the splitting spaces (133) in the thin plate group (13) has a first splicing portion (101) and a second splicing portion (102) on opposite sides, respectively, and the matching shapes of the first splicing portion (101) and the second splicing portion (102) in each splitting space (133) are adapted to each other; After the plurality of thin plate groups (13) are stacked on each other, the thin plates (131) in the axial direction correspond to each other and are stacked and connected to form an iron core monomer (201), so that the locking portions (132) of the thin plates (131) corresponding to at least one retaining ring (14) in each iron core monomer (201) are respectively tightly fitted in the plurality of locking grooves (142) of the corresponding retaining ring (14), thereby forming an iron core group (200) and outputting it from the continuous punching die (300), and entering step S2; S2. Separate each core unit (201) in the core group (200) from the retaining ring (14), so that each core unit (201) forms an independent product to be assembled.

2. The method for producing a laminated core according to claim 1, characterized in that: In step S1: S11, punching and forming a plurality of slot-shaped holes (8) arranged in a circular array at the edge of the reserved hole (7), and the inner end of each slot-shaped hole (8) is close to the edge of the reserved hole (7); S12, punching out an outer hole (10) in a region beside the outer end of each slot-shaped hole (8), wherein the inner end of the outer hole (10) is connected to the outer end of the slot-shaped hole (8) and the two are interconnected, and the two opposite sides of the outer hole (10) in the width direction are respectively a first joint portion (101) and a second joint portion (102), wherein a concave portion (103) is formed on the first joint portion (101), and a convex portion (104) adapted to the concave portion (103) is formed on the second joint portion (102); S13, punching is performed along the inner end of each slot-shaped hole (8) to form a stator inner hole (15) and a ring-shaped waste material (11), and the punched-out ring-shaped waste material (11) falls as waste material, so that a slot-shaped opening (81) is formed at the inner end of each slot-shaped hole (8), so that the slot-shaped hole (8) is connected to the stator inner hole (15); or Punching is performed along the inner end of each slot-shaped hole (8) to form a stator inner hole (15) and a retaining ring (14), and a slot-shaped opening (81) is formed at the inner end of each slot-shaped hole (8), and the punched retaining ring (14) is pushed back into the stator inner hole (15), and a plurality of protrusions (141) on the retaining ring (14) are respectively tightly fitted in each slot-shaped opening (81), so that the locking portion (132) between each two adjacent slot-shaped openings (81) is also respectively tightly fitted in each locking groove (142) on the retaining ring (14), and the stator inner hole (15) and the retaining ring (14) forming step is an independent punching step or is combined with step S12 into one punching step; S14, punching along the outer end of the outer hole (10) to form a thin plate group (13) with a retaining ring (14) or a thin plate group (13) without a retaining ring (14), so that a plurality of thin plate groups (13) without retaining rings (14) and at least one thin plate group (13) with a retaining ring (14) are stacked on each other in the blanking channel (334) to form at least one iron core group (200), and the outer end of the outer hole (10) is punched to form a dividing opening (134) so ​​that a dividing space (133) in the thin plate group (13) is formed.

3. The method for producing a laminated core according to claim 2, characterized in that: Between step S13 and step S14, there is also a step of forming a core buckle point (12), which step is: selectively punching and forming at least one core buckle point (12) in the side area of ​​the outer hole (10) and / or the slot hole (8), so that after the plurality of thin plate groups (13) are stacked on each other, the thin plates (131) in the axial direction are buckled through the core buckle point (12); The step of forming a core through-hole (9) is included between step S11 and step S12, and the step is as follows: at least one core through-hole (9) is selectively punched and formed in the side area of ​​the outer shape hole (10) and / or the slotted hole (8), and the position of the core through-hole (9) corresponds to the position of the core buckle point (12), and after a core group (200) is formed, the thin plate (131) having the core through-hole (9) is located at the end of the core monomer (201).

4. The method for producing a laminated core according to claim 2, characterized in that: Between step S13 and step S14, there is also included a glue coating step, which is: selectively coating glue on the side areas of the outer shape hole (10) and / or the slot hole (8), so that after the multiple thin plate groups (13) are stacked on each other, the thin plates (131) in the axial direction are bonded by the glue.

5. The method for producing a laminated iron core according to claim 2, characterized in that: In step S13, after the stator inner hole (15) is formed, the retaining ring (14) is punched down and pushed back into the stator inner hole (15). The device used is a recoil forming device, which includes a punching punch (303) and a punching die (304) adapted to the shapes of the retaining ring (14) and the stator inner hole (15), a top block (305) located in the punching hole of the punching die (304), and a push-back reset mechanism located below the top block (305), the upper end of the push-back reset mechanism is connected to the top block (305), and the punching punch (303) is installed on the upper die (301) of the continuous punching die (300), and the punching die (304), the top block (305) and the push-back reset mechanism are all installed on the lower die (302) of the continuous punching die (300).

6. The method for producing a laminated iron core according to claim 5, characterized in that: The recoil forming device also includes a weight-reducing spring (318), a connecting bolt (317), a plate-drawing back plate (315) and a punch plate-drawing (316). The upper die (301) of the continuous punching die (300) is provided with a plate-drawing cavity (336), a first channel (311) and a second channel (312) whose inner diameter is larger than the first channel (311). The upper end of the punching punch (303) is placed in the second channel (312) and the lower end thereof is placed in the first channel (311). The plate-drawing cavity (336) A draw plate back plate (315) is fixedly installed inside, a punch draw plate (316) is slidably installed on the bottom surface of the draw plate back plate (315), and the bottom surface of the punch draw plate (316) contacts the top surface of the punching punch (303), and a plurality of trapezoidal grooves (320) and a plurality of trapezoidal protrusions (319) are arranged at intervals on the bottom surface of the punch draw plate (316) and the top surface of the punching punch (303), and a connecting bolt (317) is inserted through the upper die (301) of the continuous punching die (300) ), and its lower end penetrates through the draw plate back plate (315) and is connected to the top surface of the punching punch (303). The weight-reducing spring (318) is sleeved on the connecting bolt (317), and its two ends respectively contact with the draw plate back plate (315) and the head of the connecting bolt (317). When the retaining ring (14) needs to be formed, the trapezoidal protrusion (319) of the punch draw plate (316) and the trapezoidal protrusion (319) of the punching punch (303) contact each other to fix the punching punch (303), and the punching A limiting step (313) in the middle of the punch (303) is limited on a limiting surface (314) between the first channel (311) and the second channel (312), so that the punch (303) can punch out the retaining ring (14). When the retaining ring (14) does not need to be formed, the trapezoidal protrusion (319) fits into the trapezoidal groove (320), and the punch (303) rises and retreats under the action of the weight-reducing spring (318), so as to selectively punch out the retaining ring (14).

7. The method for producing a laminated iron core according to claim 5, characterized in that: The push-back reset mechanism comprises a push rod (325), a push-back plate (329), a push-back spring (331), a fixing plate (333), a positioning column (327) and a positioning rod (332); a lower die (302) of a continuous punching die (300) is provided with a cavity (330), a die mounting hole (324) and a recess (328) located below the die mounting hole (324); the punching die (304) is installed in the die mounting hole (324); and the recess (328) is located below the die mounting hole (324). 28) corresponds to the position of the top block (305), and the inner diameter of the recess (328) is larger than the outer diameter of the top block (305). The top rod (325) is movably arranged in the lower die (302) of the continuous punching die (300). The top plate (329) and the push-back spring (331) are both arranged in the cavity (330). The two ends of the push-back spring (331) are respectively in contact with the bottom surface of the top plate (329) and the inner bottom surface of the cavity (330). The upper end of the top rod (325) is in contact with the top plate (329). The upper end of the positioning post (327) is fixed to the top block (305), and the inner bottom surface of the recess (328) is provided with a guide channel (326). The lower end of the positioning post (327) is placed in the guide channel (326). The fixing plate (333) is fixed to the inner bottom surface of the cavity (330). The lower end of the push-back spring (331) is in contact with the top surface of the fixing plate (333). The positioning rod (33 2) is fixed on the top plate (329), and its lower end is movably arranged on the fixed plate (333); when the punching punch (303) punches down, it presses the top block (305) to compress the push-back spring (331) and move the top block (305) downward; when the punching punch (303) gradually moves upward, the push-back spring (331) also gradually expands, and the top block (305) also gradually moves upward to push the retaining ring (14) back into the stator inner hole (15).

8. The method for producing a laminated core according to claim 1, characterized in that: In step S2, each core monomer (201) on the retaining ring (14) is radially translated outward by pulling, so that each core monomer (201) is separated from the retaining ring (14), or the retaining ring (14) is radially deformed inward by pushing, so that each core monomer (201) is separated from the retaining ring (14).

9. The method for producing a laminated core according to claim 1, characterized in that: Before step S1, a rotor core forming step S0 is also included, which is as follows: A continuous punching die (300) is used to perform continuous step-by-step punching on a thin strip material (100) to form a plurality of process holes (1) arranged in an annular array in a forming area of ​​the thin strip material (100); Punching and forming a plurality of first V-shaped magnetic steel grooves (2) in a forming area of ​​a thin strip material (100), wherein the plurality of first V-shaped magnetic steel grooves (2) are respectively located in an area outside each process hole (1); Punching and forming a plurality of second V-shaped magnetic steel grooves (3) in a forming area of ​​the thin strip material (100), and each second V-shaped magnetic steel groove (3) is located between the plurality of first V-shaped magnetic steel grooves (2); The rotor iron core sheets (6) are formed and blanked along the outer areas of the first V-shaped magnetic steel groove (2) and the second V-shaped magnetic steel groove (3), and in the continuous forming process, a plurality of rotor iron core sheets (6) are stacked on each other to form a rotor iron core, and a reserved hole (7) is formed on the thin strip material (100).

10. The method for producing a laminated core according to claim 9, characterized in that: Before the step of blanking the rotor core sheets (6), a step of forming a rotor buckle point (5) and a rotor shaft hole (16) is also included, wherein the rotor shaft hole (16) and the rotor buckle point (5) are punched and formed in a forming area of ​​the thin strip material (100), and the rotor buckle point (5) is located in the side area of ​​the rotor shaft hole (16), the process hole (1), the first V-shaped magnetic steel slot (2) or the second V-shaped magnetic steel slot (3), so that the rotor core sheets (6) in the rotor core are buckled through the rotor buckle point (5); The invention also includes a rotor through-sheet hole (4) forming step before the rotor buckle point (5) forming step, which comprises: punching and forming at least one rotor through-sheet hole (4) in the side area of ​​the rotor shaft hole (16), the process hole (1), the first V-shaped magnetic steel slot (2) or the second V-shaped magnetic steel slot (3), and the position of the rotor through-sheet hole (4) corresponds to the position of the rotor buckle point (5), and after a rotor core is formed, the rotor core sheet (6) having the rotor through-sheet hole (4) is located at the end of the rotor core.

11. The method for producing a laminated core according to claim 2, characterized in that: The number of the outer shapes formed in step S12 is an even number, so that the number of thin plates (131) and the number of dividing spaces (133) in the thin plate group (13) formed in step S14 are also an even number, and the number of thin plates (131) in the thin plate group (13) is equal to the number of dividing spaces (133); In step S14, the stacked thin plate group (13) locked in the blanking channel (334) is rotated 360° / N, where N is a positive integer.

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