Method for manufacturing movable motor core

Abstract

The present invention is a method for manufacturing a movable motor core, which utilizes continuous step-by-step punching to form a stator core with a long buckle groove and a stator core with a column point, and the two types of cores are formed as a multi-piece stacked stator core, and the column point is movably buckled into the long buckle groove. The stator core can be unfolded after forming, and the column point can be moved along the length direction of the long buckle groove after unfolding, so that the distance between two adjacent teeth in the unfolded stator core is further enlarged, thereby facilitating the detection of the inside of the stator core and the winding of the teeth.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing electric motors for new energy vehicles, and in particular to a method for manufacturing a movable electric motor 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 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, especially the formed stator core cannot be unfolded, it is difficult to detect the inner wall of the stator core and automatically wind the teeth. Therefore, the number of winding coils is often insufficient or too many or the winding is disordered, and the winding efficiency is low. At the same time, the detection is inaccurate, resulting in a large number of defective products returned after shipment.

[0003] Therefore, based on the above, there is an urgent need for a method for manufacturing a movable motor core that can overcome the above defects. Summary of the invention

[0004] The present invention is a method for manufacturing a movable motor core designed to solve the above technical problems.

[0005] A method for manufacturing a movable motor core designed by the present invention comprises the following steps:

[0006] S1, the strip material moves in a continuous step-by-step manner and is punched during the movement, so that a plurality of slot-shaped holes arranged in an annular array are punched out of the periphery of the forming hole in the forming area of ​​the strip material, and the inner side end of each slot-shaped hole is close to the inner wall of the forming hole;

[0007] S2, the first tearing portion or the second tearing portion and the third tearing portion near the outer end of each slot-shaped hole are torn and punched, so that the first tearing portion or the second tearing portion and the third tearing portion are inclined, and after the first tearing portion or the second tearing portion and the third tearing portion are restored to a horizontal state, a crack connected with the stator outer shape hole and the slot-shaped hole is formed in the middle of the area between the inner side of the stator outer shape hole and the outer side of the slot-shaped hole, and the crack formed by the first tearing portion has a first curved portion, and the crack formed by the second tearing portion has a second curved portion;

[0008] When multiple elongated buckle grooves arranged in an annular array are punched and formed, the elongated buckle grooves are formed beside the first curved portion, and one end of the elongated buckle groove is located in the concave side of the first curved portion, and no elongated buckle grooves are formed on both sides of the crack formed by the third tearing portion;

[0009] When multiple pillars arranged in an annular array are selected for punching and forming, the elongated buckle groove is not punched and formed, and the pillars are formed in the concave side of the second curved portion, and no pillars are formed on both sides of the crack formed by the third tearing portion;

[0010] S3, punching along the inner ends of all the slot-shaped holes to form a stator inner hole, and the inner ends of each slot-shaped hole form a slot-shaped opening;

[0011] S4, punching and forming a second buckle point on the side of the slotted hole;

[0012] S5. A stator core sheet is formed by blanking a plurality of T-sheets arranged in a ring along the inner side of the stator outer shape hole as a blanking boundary, and a stator notch is formed at the outer edge of each T-sheet. In the continuous blanking process, a plurality of stator core sheets are stacked in the rotor blanking channel, and each stator core sheet is buckled with each other through a second buckle point to form a stator core; wherein the sheet types of each two adjacent stator core sheets in the stator core are different, so that the column point at one end of the transverse portion of each of the two axially adjacent and staggered T-sheets can be moved. It is fitted in the elongated buckle groove at one end of the transverse part of another T-piece, or the stator core includes multiple laminations, and a stator iron core sheet with a column point is arranged between each adjacent two laminations, and each lamination is composed of multiple stator iron core sheets 21 with elongated buckle grooves 31, so that the column point at one end of each T-piece in the stator iron core sheet can be movably fitted in the elongated buckle groove at one end of each T-piece of the stator iron core sheet at the end of an adjacent lamination, and the crack formed in the stator iron core through the third tearing portion makes the two opposite ends of the crack in a connected state or a separated state.

[0013] According to the above-mentioned method for manufacturing a movable motor core, before step S1, step S0 is also included: a step of forming a rotor core, and the steps are as follows:

[0014] Punching and forming a plurality of first heat dissipation hole groups arranged in a ring array in a forming area of ​​the strip material, each first heat dissipation hole group is composed of a plurality of first heat dissipation holes arranged in a straight line;

[0015] A plurality of second heat dissipation hole groups, a plurality of stator outer shape holes and a plurality of ventilation holes are punched and formed in a forming area of ​​the strip material, the plurality of ventilation holes are arranged in a circular array around the center point of the forming area of ​​the strip material, each second heat dissipation hole group is located between two adjacent first heat dissipation hole groups, so that the first heat dissipation hole group and the second heat dissipation hole group are arranged in a circular array around the periphery of the plurality of circularly arranged ventilation holes, the plurality of stator outer shape holes are arranged in a circular array around the periphery of the first heat dissipation hole group and the second heat dissipation hole group, and each second heat dissipation hole group is composed of a plurality of second heat dissipation holes arranged in a straight line;

[0016] Magnetic steel grooves are punched and formed at positions corresponding to the inner sides of each first heat dissipation hole group and each second heat dissipation hole group;

[0017] Punching and forming an axial hole and a first buckle point in the forming area of ​​the strip material, and selectively punching and forming a long buckle groove in the forming area of ​​the strip material, the axial hole is located at the center point of the forming area of ​​the strip material, the first buckle point is located beside the magnetic steel slot, and when the long buckle groove is formed, it is located inside the stator outer shape hole; when the long buckle groove does not need to be formed, the long buckle groove is not punched and formed in this step;

[0018] The rotor iron core sheets are blanked by punching along the areas near the ends of the magnetic steel slots and the outer sides of the first heat dissipation hole group and the second heat dissipation hole group as the blanking boundaries. In the continuous blanking process, multiple rotor iron core sheets are stacked in the rotor blanking channel, and the rotor iron core sheets are buckled with each other through the first buckling points to form a rotor core. The axial holes, magnetic steel slots, first heat dissipation holes, second heat dissipation holes and ventilation holes of each piece in the rotor core are correspondingly arranged.

[0019] According to the above-mentioned method for manufacturing a movable motor core, the step of forming the magnetic steel slot further includes: selectively punching a stepped countersunk hole in a manner of covering all ventilation holes;

[0020] When the step countersink is formed, the center of the step countersink is concentrically arranged with the center point of the forming area of ​​the strip material, the diameter of the step countersink is larger than the diameter of the shaft hole, and the rotor iron core sheet with the step countersink is stacked on the end of the rotor iron core after being formed.

[0021] According to the manufacturing method of a movable motor core described above, the shaft hole forming step also includes: a portion close to the inner side of the stator outer shape hole is not punched out, and the other portions close to the inner side of the stator outer shape hole are punched out, so that the portion close to the inner side of the stator outer shape hole is not formed with a long buckle groove, and the other portions close to the inner side of the stator outer shape hole are formed with a long buckle groove.

[0022] According to the manufacturing method of a movable motor core described above, before the forming step of the first buckle point and the shaft hole, it also includes: punching and forming a plurality of process holes arranged in a circular array in the area surrounded by the plurality of magnetic steel slots, and the plurality of process holes are arranged around the center point of the forming area of ​​the strip material.

[0023] According to the manufacturing method of a movable motor core described above, the process hole forming step also includes: a first through-sheet hole is punched out on the side of each magnetic steel slot, and when the rotor iron core sheet with the first through-sheet hole is formed, the rotor iron core sheet with the first through-sheet hole is stacked on the end of the rotor core, and the first through-sheet hole of the rotor iron core sheet is interlocked with the first buckle point adjacent to it axially.

[0024] According to the manufacturing method of a movable motor core described above, before the step of forming the inner hole of the stator, it also includes: punching and forming a second through-sheet hole on the side of the slot-shaped hole, when the stator iron core sheet with the second through-sheet hole is formed, the stator iron core sheet with the second through-sheet hole is stacked on the end of the stator iron core, and the second through-sheet hole of the stator iron core sheet and its adjacent second buckle point are buckled with each other.

[0025] According to the manufacturing method of a movable motor core described above, in step S2, the first pair of tearing and blanking parts, the second pair of tearing and blanking parts and the third pair of tearing and blanking parts all include a holding mechanism, an ejector pin, a return mechanism, and a punch and a die whose side wall is adapted to the shape of the crack. When the holding mechanism acts on the top of the punch, the punch and the die cooperate with each other to perform punching on the strip material, so that at least one of the first tearing part, the second tearing part and the third tearing part is bent in an inclined shape; after the punch and the die are separated from each other, the ejector pin is pushed up under the action of the return mechanism to return at least one of the first tearing part, the second tearing part and the third tearing part to a horizontal state;

[0026] When the holding mechanism does not act on the top end of the punch, the punch blanking fails.

[0027] According to the manufacturing method of a movable motor core described above, the holding mechanism includes a first movable plate which is only axially movable and is arranged at the top end of the punch and a second movable plate which is matched with the upper side of the first movable plate, and the upper side of the first movable plate and the lower side of the second movable plate are both provided with a plurality of trapezoidal protrusions arranged at intervals, and trapezoidal recesses are formed between the trapezoidal protrusions; when the trapezoidal protrusions of the first movable plate abut against the trapezoidal protrusions of the second movable plate, the lower side of the first movable plate abuts against the top end of the punch, and the punch is fixed; when the trapezoidal protrusions between the first movable plate and the second movable plate are matched with the trapezoidal recesses, the punch is in an active state;

[0028] The ejector mechanism includes an installation channel and an elastic member arranged in the installation channel. The lower end of the ejector pin is located in the installation channel. The two ends of the elastic member respectively abut against the lower end of the ejector pin and the lower end of the installation channel. The upper end of the ejector pin is inserted into the die.

[0029] According to the manufacturing method of a movable motor core described above, it also includes a stripping plate, the lower end of the punch passes through the through hole of the stripping plate, a stopper is embedded on the inner wall of the through hole of the stripping plate, one side wall of the stopper is arranged in contact with the outer wall of the punch, and the lower end of the punch is provided with an inclined surface.

[0030] The present invention provides a method for manufacturing a movable motor core, and its beneficial effects are as follows:

[0031] 1. The present invention allows the stator core to be unfolded after forming, and after unfolding, the column points can move along the length direction of the long buckle slot, so that the distance between two adjacent teeth in the unfolded stator core is further expanded, thereby facilitating the inspection of the inside of the stator core and the winding of the teeth.

[0032] 2. When punching the column point, the column point punching punch can be smaller than the column point punching die, as long as the column point at the punching location is smaller than the long buckle groove, thereby preventing the column point punching punch and the column point punching die from cracking when they cooperate with each other when punching the column point.

[0033] 3. The setting of the stop block can prevent the punch from being inaccurately positioned during punching of the tearing part, thereby improving the position accuracy of the punching of the tearing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is the layout diagram of the simultaneous manufacturing process of the rotor core and the stator core (I).

[0035] Figure 2 This is the layout diagram of the simultaneous manufacturing process of the rotor core and the stator core (I).

[0036] Figure 3 It is a structural schematic diagram of the tearing and blanking part.

[0037] Figure 4 It is a schematic diagram of the structure of the die of the tearing and blanking part.

[0038] Figure 5 It is a schematic diagram of the structure without punching of the tearing and punching part.

[0039] Figure 6 It is a schematic diagram of the structure in which the tearing and blanking part has been blanked.

[0040] Figure 7 It is a schematic diagram of the structure of the strip material that has been punched.

[0041] Figure 8 It is a structural schematic diagram of the return of the return mechanism after the tearing and blanking part completes the blanking.

[0042] Fig. 9 It is a schematic diagram of the structure after the strip material returns to the top.

[0043] Fig.10 It is a schematic diagram of the stator core structure with long buckle slots.

[0044] Fig.11 It is a schematic diagram of the stator core structure with column points.

[0045] Fig.12 It is a schematic diagram of the structure of the post point blanking punch and the post point blanking die.

[0046] Fig.13Schematic diagram of the structure in which the long buckle groove and the column point cooperate with each other (I).

[0047] Fig.14 Schematic diagram of the structure of the long buckle groove and the column point cooperating with each other (II).

[0048] Fig.15 It is a structural diagram of the stator core.

[0049] Fig.16 This is a schematic diagram of the structure after the stator core is unfolded.

[0050] Fig.17 It is a schematic diagram of the cross-sectional structure of the stator core when it is unfolded.

[0051] In the figure: 100, strip material; 101, first heat dissipation hole; 201, second heat dissipation hole; 1, first heat dissipation hole group; 2, second heat dissipation hole group; 3, ventilation hole; 4, stator outer hole; 5, magnetic steel slot; 6, step countersunk hole; 7, process hole; 8, first through-sheet hole; 9, first buckle point; 10, shaft hole; 11, rotor iron core sheet; 12, forming hole; 13, slot-shaped hole; 14, first tear portion; 15, second tear portion; 16, third tear portion; 17, crack; 18, second through-sheet hole; 19, stator inner hole; 20, slot-shaped opening; 21, stator iron core sheet; 22. Holding mechanism; 23. Punch; 24. Stopper; 25. Unloading plate; 26. Installation channel; 27. Return mechanism; 28. Ejector; 29. ​​Die; 30. Second buckle point; 31. Long buckle groove; 32. Pillar point; 33. Pillar point punching punch; 34. Pillar point punching die; 35. Lamination; 171. First curved portion; 172. Second curved portion; 211. T-piece; 212. Stator notch; 231. Inclined surface; 271. Elastic member; 221. First movable plate; 222. Second movable plate; 223. Trapezoidal convex portion; 224. Trapezoidal concave portion. DETAILED DESCRIPTION

[0052] 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.

[0053] like Figure 1 and Figure 2 As shown, a method for manufacturing a movable motor core described in this embodiment includes the following steps:

[0054] Step S0: forming step of the rotor core, the steps are as follows:

[0055] The strip material 100 moves in a continuous step-by-step manner and is punched during the movement, so as to punch out a plurality of first heat dissipation hole groups 1 arranged in a ring array in a forming area of ​​the strip material 100. Each first heat dissipation hole group 1 is composed of a plurality of first heat dissipation holes 101 arranged in a straight line. The setting of the first heat dissipation holes 101 improves the heat dissipation performance of the rotor core during operation.

[0056] A plurality of second heat dissipation hole groups 2, a plurality of stator outer holes 4 and a plurality of ventilation holes 3 are punched and formed in the forming area of ​​the strip 100. The plurality of ventilation holes 3 are arranged in a circular array around the center point of the forming area of ​​the strip 100, and each second heat dissipation hole group 2 is located between two adjacent first heat dissipation hole groups 1, so that the first heat dissipation hole group 1 and the second heat dissipation hole group 2 are arranged in a circular array on the periphery of the plurality of circularly arranged ventilation holes 3, and the plurality of stator outer holes 4 are arranged in a circular array on the periphery of the first heat dissipation hole group 1 and the second heat dissipation hole group 2, and each second heat dissipation hole group 2 is composed of a plurality of second heat dissipation holes 201 arranged in a straight line; the provision of the second heat dissipation holes 201 increases the number of heat dissipation holes, and the provision of the ventilation holes 3 further improves the heat dissipation performance of the formed rotor core, thereby further improving the performance of the rotor core.

[0057] Magnetic steel slots 5 are punched and formed at positions corresponding to the inner sides of each first heat dissipation hole group 1 and each second heat dissipation hole group 2; the magnetic steel slots 5 are V-shaped structures, so that the formed rotor core generates magnetic flux when powered on.

[0058] The shaft hole 10 and the first buckle point 9 are punched out in the forming area of ​​the strip material 100, and the long buckle groove 31 is selectively punched out in the forming area of ​​the strip material 100. The shaft hole 10 is located at the center point of the forming area of ​​the strip material 100, and the first buckle point 9 is located beside the magnetic steel slot 5. After the long buckle groove 31 is formed, it is located inside the stator outer shape hole 4, and when the long buckle groove 31 is formed, a portion close to the inner side of the stator outer shape hole 4 is not punched out, and the other portions close to the inner side of the stator outer shape hole 4 are punched out, so that the portion close to the inner side of the stator outer shape hole 4 is not formed with the long buckle groove 31, and the other portions close to the inner side of the stator outer shape hole 4 are all formed with the long buckle groove 31. When only the column point is formed on the strip material and the long buckle groove 31 does not need to be formed, the long buckle groove 31 is not punched out in this step, and the first buckle point 9 can be punched out to form a round or square shape.

[0059] The characteristic forming of the above steps is continuous step-by-step punching and is prepared for the forming of the rotor core sheet 11 . The continuous step-by-step punching can improve the production efficiency.

[0060] The rotor core pieces 11 are blanked by punching along the portion near the end of the magnetic steel slot 5 and the outer sides of the first heat dissipation hole group 1 and the second heat dissipation hole group 2 as the blanking boundaries. In the continuous blanking process, multiple rotor core pieces 11 are stacked in the rotor blanking channel, and the rotor core pieces 11 are buckled with each other through the first buckling point 9 to form a rotor core. The axial hole 10, magnetic steel slot 5, first heat dissipation hole 101, second heat dissipation hole 201 and ventilation hole 3 of each piece in the rotor core are correspondingly arranged; the axial hole 10 of the rotor core is used for installing the rotating shaft.

[0061] In this embodiment, the step of forming the magnetic steel slot 5 also includes: selectively punching a step countersunk hole 6 in a manner to cover all the ventilation holes 3; when the step countersunk hole 6 has been formed, the center of the step countersunk hole 6 is concentrically arranged with the center point of the forming area of ​​the strip 100, the diameter of the step countersunk hole 6 is larger than the diameter of the axial hole 10, and after the rotor iron core sheet 11 with the step countersunk hole 6 is formed, it is stacked on the end of the rotor core; wherein, generally, this step is selected only when the end of the rotor core needs to be formed with a step countersunk hole 6, and the setting of the step countersunk hole 6 enables the step countersunk hole 6 at the end of the rotor core to be nested and matched with the bearing at the end of the motor casing after the rotor core is installed in the motor casing, so as to position the rotor core, so that the rotation of the rotor core is more stable and reliable; in addition, the formed step countersunk hole 6 will not penetrate the strip 100, but will only be recessed to a certain depth on the surface of the strip 100.

[0062] In this embodiment, before the forming step of the first buckle point 9 and the shaft hole 10 , it also includes: punching and forming a plurality of process holes 7 arranged in a circular array in the area surrounded by the plurality of magnetic steel grooves 5 , and the plurality of process holes 7 are arranged around the center point of the forming area of ​​the strip material 100 .

[0063] In this embodiment, the forming step of the process hole 7 also includes: punching and forming a first through-sheet hole 8 on the side of each magnetic steel slot 5; after the rotor iron core sheet 11 with the first through-sheet hole 8 is formed, the rotor iron core sheet 11 with the first through-sheet hole 8 is stacked on the end of the rotor iron core, and the first through-sheet hole 8 of the rotor iron core sheet 11 is interlocked with the first buckle point 9 adjacent to it in the axial direction; its structure enables separate discharging between two adjacent rotor cores in the rotor blanking channel, and the first through-sheet hole 8 can also be round or square.

[0064] S1. The strip material 100 is still moving in a continuous step-by-step manner and is punched during the movement, so that a plurality of slot holes 13 arranged in a circular array are punched out of the periphery of the forming hole 12 in the forming area of ​​the strip material 100, and the inner end of each slot hole 13 is close to the inner wall of the forming hole 12. This step is to prepare for the forming of the stator iron core sheet 21.

[0065] S2, the first tearing portion 14 or the second tearing portion 15 and the third tearing portion 16 near the outer end of each slot-shaped hole 13 are torn and punched, so that the first tearing portion 14 or the second tearing portion 15 and the third tearing portion 16 are inclined downward, and after the first tearing portion 14 or the second tearing portion 15 and the third tearing portion 16 are restored to a horizontal state, a crack 17 connected to the stator outer shape hole 4 and the slot-shaped hole 13 is formed in the middle of the area between the inner side of the stator outer shape hole 4 and the outer side of the slot-shaped hole 13, and the crack 17 formed by the first tearing portion 14 has a first bending portion 171, and the crack 17 formed by the second tearing portion 1 The crack 17 formed by the first tearing portion 14 and the crack 17 formed by the second tearing portion 15 may be formed in the order of: after the crack 17 formed by the first tearing portion 14 is formed, the crack 17 formed by the second tearing portion 15 is formed immediately next time; or after the crack 17 formed by the second tearing portion 15 is formed once, the crack 17 formed by the first tearing portion 14 is formed more than four times.

[0066] When multiple elongated buckle grooves 31 arranged in a circular array are selected for punching and forming, the elongated buckle grooves 31 are formed on the side of the first curved portion 171, and one end of the elongated buckle grooves 31 is located in the concave side of the first curved portion 171, and the elongated buckle grooves 31 are not formed on both sides of the crack 17 formed by the third tearing portion 16; after the elongated buckle grooves 31 are formed in this step, the elongated buckle grooves 31 can be formed on the stator iron core sheet 21, and the elongated buckle grooves 31 are runway-shaped grooves.

[0067] When multiple pillar points 32 arranged in an annular array are selected for punching and forming, the elongated buckle groove 31 is not punched and formed, and the pillar points 32 are formed in the concave side of the second curved portion 172, and the pillar points 32 are not formed on both sides of the crack 17 formed by the third tearing portion 16; after the pillar points 32 in this step, only the pillar points 32 are formed on the stator core sheet 21. Fig.12 As shown, when punching the column point 32, the column point punching punch 33 and the column point punching die 34 cooperate with each other to punch out the column point 32 on the strip material. The column point punching punch 33 is smaller than the column point punching die 34. As long as the column point 32 at the punching location is smaller than the elongated buckle groove 31, it can be done, thereby preventing the column point punching punch 33 and the column point punching die 34 from cracking when they cooperate with each other when punching the column point 32.

[0068] In the above, 1. the step of forming the elongated buckle groove 31 and the step of forming the column point 32 are two independent forming steps, such as Figure 1 As shown, the step of forming the elongated buckle groove 31 is located in front of the step of forming the column point 32; Figure 2As shown, the step of forming the column point 32 is arranged between the punching station of the second tearing portion 15 and the punching process of the second through-hole 18. This arrangement can make the process coordination more reasonable. Figure 1 As shown, the first tear portion 14 and the third tear portion 16 are punched and formed as one punching step; Figure 2 As shown, the second tear portion 15 and the third tear portion 16 punching and forming step serves as another punching and forming step, and the first tear portion 14 and the third tear portion 16 punching and forming step are located in front of the second tear portion 15 and the third tear portion 16 punching and forming step, and the two punching steps are selectively punched according to the stator core with different structures.

[0069] S3, punching out along the inner ends of all the slot-shaped holes 13 to form a stator inner hole 19, and forming a slot-shaped opening 20 at the inner end of each slot-shaped hole 13; the structure of this step is formed as an essential feature of the stator core sheet 21.

[0070] S4. Punch and form a second buckle point 30 beside the slot-shaped hole 13; its structure serves as a feature for connecting multiple stator core sheets 21 after stacking, so that after the stator core sheets 21 are formed and blanked and fall into the stator blanking channel, they can be stacked and connected immediately, realizing the forming of the stator core as soon as the material is discharged, and the first buckle point 9 can be punched to form a circle or a square.

[0071] S5, a stator core sheet 21 is formed by blanking along the inner side of the stator outer hole 4 as a blanking boundary and arranged in a ring by a plurality of T-sheets 211, and a stator notch 212 is formed at the outer edge of each T-sheet 211. In the continuous blanking process, a plurality of stator core sheets 21 are stacked in the rotor blanking channel, and each stator core sheet 21 is buckled with each other through a second buckle point 30 to form a stator core; wherein, the sheet types of each two adjacent stator core sheets 21 in the stator core are different, so that in each of the two axially adjacent and staggered T-sheets 211, a column point 32 at one end of the transverse portion of one T-sheet 211 can be flexibly matched in an elongated buckle groove 31 at one end of the transverse portion of the other T-sheet 211, or the stator core includes a plurality of laminations 35, and a second buckle point 30 is provided between each adjacent two laminations 35. A stator core sheet 21 with a column point 32 is arranged, and each stack 35 is composed of a plurality of stator core sheets 21 with elongated buckle slots 31, generally more than two sheets, so that the column point 32 at one end of each T-piece 211 in the stator core sheet 21 can be flexibly matched in the elongated buckle slot 31 at one end of each T-piece 211 of the stator core sheet 21 at the end of an adjacent stack 35, and the crack 17 formed by the third tearing portion 16 in the stator core makes the two opposite ends of the crack 17 in a connected state or a separated state; in the separated state, the stator core can be unfolded in a straight line, and the column point 32 can be displaced along the elongated buckle slot 31, so that the spacing between the teeth of the stator core is increased, so as to facilitate the winding of the stator core; in the connected state, a circular stator core can be formed, please refer to Fig.10 , Fig.11 , Figure 13-Figure 17 shown.

[0072] In this embodiment, before the step of forming the stator inner hole 19, it also includes: punching and forming a second through-sheet hole 18 on the side of the slotted hole 13. After the stator iron core sheet 21 with the second through-sheet hole 18 is formed, the stator iron core sheet 21 with the second through-sheet hole 18 is stacked on the end of the stator iron core, and the second through-sheet hole 18 of the stator iron core sheet 21 is interlocked with the adjacent second buckle point 30. Its structure enables separate discharge between two adjacent rotor cores in the rotor blanking channel, and the second through-sheet hole 18 can be punched out to form a circle or a square.

[0073] In this embodiment, Figure 3-Figure 9 As shown, in step S2, a first pair of tearing blanking parts is correspondingly arranged at the first tearing part 14, a second pair of tearing blanking parts is correspondingly arranged at the second tearing part 15, and a third pair of tearing blanking parts is correspondingly arranged at the third tearing part 16. The first pair of tearing blanking parts, the second pair of tearing blanking parts and the third pair of tearing blanking parts are all arranged in a continuous blanking die, wherein the first pair of tearing blanking parts, the second pair of tearing blanking parts and the third pair of tearing blanking parts all include a holding mechanism 22, an ejector pin 28, a return ejector mechanism 27, and a punch 23 and a die 29 whose side wall is adapted to the shape of the crack 17. When the holding mechanism 22 When acting on the top of the punch 23, the punch 23 and the die 29 cooperate with each other to perform blanking on the strip 100, so that at least one of the first tear portion 14, the second tear portion 15 and the third tear portion 16 is bent in an inclined shape; after the punch 23 and the die 29 are separated from each other, the ejector pin 28 is pushed up under the action of the return mechanism 27 to return at least one of the first tear portion 14, the second tear portion 15 and the third tear portion 16 to a horizontal state; when the holding mechanism 22 does not act on the top of the punch 23, the punching of the punch 23 fails; its structure realizes the forming of the crack 17 more efficiently.

[0074] The holding mechanism 22 is arranged in the upper die of the continuous punching die, and the return mechanism 27 is arranged in the lower die of the continuous punching die. Specifically, the holding mechanism 22 includes a first movable plate 221 which is only axially movable and arranged at the top of the punch 23, and a second movable plate 222 which is matched with the upper side of the first movable plate 221. The upper side surface of the first movable plate 221 and the lower side surface of the second movable plate 222 are both provided with a plurality of trapezoidal protrusions 223 arranged at intervals, and a trapezoidal recess 224 is formed between each of the trapezoidal protrusions 223. When the trapezoidal protrusions 223 of the first movable plate 221 and the trapezoidal protrusions 223 of the second movable plate 222 are aligned, the first movable plate 221 and the second movable plate 222 are aligned. When in contact, the lower side surface of the first movable plate 221 contacts the top of the punch 23, and the punch 23 is fixed; when the trapezoidal protrusion 223 between the first movable plate 221 and the second movable plate 222 cooperates with the trapezoidal recess 224, the punch 23 is in an active state; the return mechanism 27 includes a mounting channel 26 and an elastic member 271 arranged in the mounting channel 26, the lower end of the ejector pin 28 is located in the mounting channel 26, the two ends of the elastic member 271 respectively contact the lower end of the ejector pin 28 and the lower end of the mounting channel 26, the upper end of the ejector pin 28 is inserted into the die 29, and the elastic member 271 adopts a spring.

[0075] In this embodiment, a stripper plate 25 is further included, the lower end of the punch 23 passes through the through hole of the stripper plate 25, a stopper 24 is embedded on the inner wall of the through hole, one side wall of the stopper 24 is arranged against the outer wall of the punch 23, and a slope 231 is arranged at the lower end of the punch 23. The stopper 24 is used to abut against and position the movement of the punch 23 to prevent the punch 23 from swinging during movement, so that the position of the crack 17 is more accurate; at the same time, the bevel 231 is used for blanking to facilitate the inclined and curved forming of the tearing portion.

Claims

1. A method for manufacturing a movable motor core, characterized in that: The steps include: S1, the strip material (100) moves in a continuous step-by-step manner and is punched during the movement, so that a plurality of slot holes (13) arranged in an annular array are punched out of the periphery of the forming hole (12) in the forming area of ​​the strip material (100), and the inner side end of each slot hole (13) is close to the inner wall of the forming hole (12); S2. The first tearing portion (14) or the second tearing portion (15) and the third tearing portion (16) near the outer end of each slot-shaped hole (13) are torn and punched so that the first tearing portion (14) or the second tearing portion (15) and the third tearing portion (16) are inclined, and after the first tearing portion (14) or the second tearing portion (15) and the third tearing portion (16) are restored to a horizontal state, a crack (17) is formed in the middle of the area between the inner side of the stator outer shape hole (4) and the outer side of the slot-shaped hole (13), and the crack (17) connected to the stator outer shape hole (4) and the slot-shaped hole (13) is formed, and the crack (17) formed by the first tearing portion (14) has a first bending portion (171), and the crack (17) formed by the second tearing portion (15) has a first bending portion (172). The crack (17) has a second curved portion (172); when multiple elongated buckle grooves (31) arranged in an annular array are selected to be punched and formed, the elongated buckle grooves (31) are formed on the side of the first curved portion (171), and one end of the elongated buckle groove (31) is located in the concave side of the first curved portion (171), and the elongated buckle grooves (31) are not formed on both sides of the crack (17) formed by the third tearing portion (16); when multiple pillar points (32) arranged in an annular array are selected to be punched and formed, the elongated buckle grooves (31) are not punched and formed, and the pillar points (32) are formed in the concave side of the second curved portion (172), and the pillar points (32) are not formed on both sides of the crack (17) formed by the third tearing portion (16); S3, punching along the inner ends of all the slot-shaped holes (13) to form a stator inner hole (19), and forming a slot-shaped opening (20) at the inner end of each slot-shaped hole (13); S4, punching and forming a second buckle point (30) on the side of the slot-shaped hole (13); S5, blanking is performed along the inner side of the stator outer shape hole (4) as a blanking boundary to form a stator iron core sheet (21) formed by a plurality of T-sheets (211) arranged in an annular manner, the outer edge of each T-sheet (211) forms a stator notch (212), and in a continuous blanking process, the plurality of stator iron core sheets (21) are stacked in a rotor blanking channel, and the stator iron core sheets (21) are buckled with each other through a second buckling point (30) to form a stator iron core; wherein, The sheet types of two adjacent stator iron sheets (21) in the stator iron core are different, so that in each of two axially adjacent and staggered T sheets (211), a column point (32) at one end of the transverse part of one T sheet (211) is movably matched in a long buckle groove (31) at one end of the transverse part of another T sheet (211), or the stator iron core includes a plurality of laminates (35), and a stator iron sheet (21) with a column point (32) is arranged between each two adjacent laminates (35). Each stack (35) is composed of a plurality of stator core sheets (21) with elongated buckle grooves (31), so that the column point (32) at one end of each T-piece (211) in the stator core sheet (21) is movably matched in the elongated buckle groove (31) at one end of each T-piece (211) of the stator core sheet (21) at the end of an adjacent stack (35), and the crack (17) formed in the stator core through the third tearing portion (16) makes the two opposite ends of the crack (17) in a connected state or a separated state.

2. The method for manufacturing a movable motor core according to claim 1, characterized in that: Before step S1, step S0 is also included: a step of forming the rotor core, and the steps are as follows: Punching and forming a plurality of first heat dissipation hole groups (1) arranged in a ring array in a forming area of ​​a strip material (100), each first heat dissipation hole group (1) being composed of a plurality of first heat dissipation holes (101) arranged in a straight line; A plurality of second heat dissipation hole groups (2), a plurality of stator outer shape holes (4) and a plurality of ventilation holes (3) are punched and formed in a forming area of ​​a strip material (100); the plurality of ventilation holes (3) are arranged in a circular array around the center point of the forming area of ​​the strip material (100); each second heat dissipation hole group (2) is located between two adjacent first heat dissipation hole groups (1), so that the first heat dissipation hole group (1) and the second heat dissipation hole group (2) are arranged in a circular array around the periphery of the plurality of ventilation holes (3) arranged in a circular array; the plurality of stator outer shape holes (4) are arranged in a circular array around the periphery of the first heat dissipation hole group (1) and the second heat dissipation hole group (2); each second heat dissipation hole group (2) is composed of a plurality of second heat dissipation holes (201) arranged in a straight line; Magnetic steel grooves (5) are punched and formed at positions corresponding to the inner sides of each first heat dissipation hole group (1) and each second heat dissipation hole group (2); A shaft hole (10) and a first buckle point (9) are punched out in a forming area of ​​the strip material (100), and a long buckle groove (31) is selectively punched out in the forming area of ​​the strip material (100), wherein the shaft hole (10) is located at the center point of the forming area of ​​the strip material (100), and the first buckle point (9) is located beside the magnetic steel slot (5). After the long buckle groove (31) is formed, it is located inside the stator outer shape hole (4); when a column point is formed on the strip material, the long buckle groove (31) is not punched out in this step; The rotor core sheets (11) are blanked by punching along the areas close to the ends of the magnetic steel slots (5) and the outer sides of the first heat dissipation hole group (1) and the second heat dissipation hole group (2) as the blanking boundaries. During the continuous blanking process, a plurality of rotor core sheets (11) are stacked in a rotor blanking channel, and the rotor core sheets (11) are buckled with each other via first buckling points (9) to form a rotor core. The shaft hole (10), magnetic steel slots (5), first heat dissipation holes (101), second heat dissipation holes (201) and ventilation holes (3) of each core sheet are arranged correspondingly.

3. The method for manufacturing a movable motor core according to claim 2, characterized in that: The step of forming the magnetic steel slot (5) also includes: selectively punching a stepped countersunk hole (6) in a manner that covers all the ventilation holes (3); When the step countersunk hole (6) is formed, the center of the step countersunk hole (6) is arranged concentrically with the center point of the forming area of ​​the strip material (100), the diameter of the step countersunk hole (6) is larger than the diameter of the shaft hole (10), and the rotor iron core sheet (11) with the step countersunk hole (6) is stacked on the end of the rotor iron core after being formed.

4. The method for manufacturing a movable motor core according to claim 2, characterized in that: The step of forming the shaft hole (10) further includes: a portion close to the inner side of the stator outer shape hole (4) is not punched out, while the other portions close to the inner side of the stator outer shape hole (4) are punched out, so that the portion close to the inner side of the stator outer shape hole (4) is not formed with the elongated buckle groove (31), while the other portions close to the inner side of the stator outer shape hole (4) are formed with the elongated buckle groove (31).

5. The method for manufacturing a movable motor core according to claim 3, characterized in that: Before the step of forming the first buckle point (9) and the shaft hole (10), the method further includes: punching and forming a plurality of process holes (7) arranged in an annular array in the area surrounded by the plurality of magnetic steel grooves (5), wherein the plurality of process holes (7) are arranged around the center point of the forming area of ​​the strip material (100).

6. The method for manufacturing a movable motor core according to claim 5, characterized in that: The step of forming the process hole (7) also includes: punching and forming a first through-hole (8) on the side of each magnetic steel slot (5); after the rotor core sheet (11) with the first through-hole (8) is formed, the rotor core sheet (11) with the first through-hole (8) is stacked on the end of the rotor core, and the first through-hole (8) of the rotor core sheet (11) and the first buckling point (9) adjacent to it in the axial direction are buckled with each other.

7. The method for manufacturing a movable motor core according to claim 1, characterized in that: Before the step of forming the stator inner hole (19), the method further includes: punching and forming a second through-sheet hole (18) on the side of the slot-shaped hole (13); after the stator iron core sheet (21) with the second through-sheet hole (18) is formed, the stator iron core sheet (21) with the second through-sheet hole (18) is stacked on the end of the stator iron core, and the second through-sheet hole (18) of the stator iron core sheet (21) and its adjacent second buckling point (30) are buckled with each other.

8. The method for manufacturing a movable motor core according to claim 1, characterized in that: In step S2, the first pair of tearing and blanking parts, the second pair of tearing and blanking parts and the third pair of tearing and blanking parts all include a holding mechanism (22), a pin (28), a return mechanism (27), and a punch (23) and a die (29) whose side wall is adapted to the shape of the crack (17); when the holding mechanism (22) acts on the top of the punch (23), the punch (23) and the die (29) cooperate with each other to perform punching on the strip material (100), so that at least one of the first tearing part (14), the second tearing part (15) and the third tearing part (16) is bent in an inclined shape; after the punch (23) and the die (29) are separated from each other, the pin (28) is pushed up under the action of the return mechanism (27) to return at least one of the first tearing part (14), the second tearing part (15) and the third tearing part (16) to a horizontal state; When the holding mechanism (22) does not act on the top end of the punch (23), the punch (23) fails to punch.

9. The method for manufacturing a movable motor core according to claim 8, characterized in that: The holding mechanism (22) comprises a first movable plate (221) which is only axially movable and is arranged at the top end of the punch (23), and a second movable plate (222) which is matched with the upper side of the first movable plate (221); the upper side of the first movable plate (221) and the lower side of the second movable plate (222) are both provided with a plurality of trapezoidal protrusions (223) arranged at intervals, and a trapezoidal recess is formed between each of the trapezoidal protrusions (223); when the trapezoidal protrusions (223) of the first movable plate (221) and the trapezoidal protrusions (223) of the second movable plate (222) collide with each other, the lower side of the first movable plate (221) and the top end of the punch (23) are collided, and the punch (23) is fixed; when the trapezoidal protrusions (223) between the first movable plate (221) and the second movable plate (222) and the trapezoidal recess cooperate, the punch (23) is in an active state; The ejector mechanism (27) comprises a mounting channel (26) and an elastic member (271) arranged in the mounting channel (26); the lower end of the ejector pin (28) is located in the mounting channel (26); the two ends of the elastic member (271) respectively contact the lower end of the ejector pin (28) and the lower end of the mounting channel (26); and the upper end of the ejector pin (28) is inserted into the concave mold (29).

10. The method for manufacturing a movable motor core according to claim 8, characterized in that: It also includes a stripper plate (25), the lower end of the punch (23) passes through the through hole of the stripper plate (25), a stopper (24) is embedded on the inner wall of the through hole of the stripper plate (25), one side wall of the stopper (24) is arranged in contact with the outer wall of the punch (23), and the lower end of the punch (23) is provided with an inclined surface (231).

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