A double-rotation slot forming method for forming a core with an inclined slot

Abstract

The application discloses a double-rotation groove resetting stamping method for forming an iron core with inclined grooves, and the stamping method is used for forming the iron core, the iron core is uniformly arrayed with a plurality of inclined grooves in the circumferential direction, and the stamping method comprises a groove rotation mechanism, a blanking rotation mechanism and a strip material. The strip material sequentially passes through the groove rotation mechanism and the blanking rotation mechanism, the groove rotation mechanism is used for rotation stamping, and the groove rotation mechanism is reset when the magnetic steel sheet of the next iron core is stamped; the blanking rotation mechanism is used for rotation, the blanking rotation mechanism is used for receiving and stacking the blanking of the next iron core, and the two adjacent magnetic steel sheets are groove-shaped and overlapped. The application provides a double-rotation groove resetting stamping method for forming an iron core with inclined grooves, which can avoid the situation that the inclined groove position on the first magnetic steel sheet of an iron core and the inclined groove position on the last magnetic steel sheet of the iron core are not at the same angle, and the adjacent two iron cores will not cause indentation when being stacked.

Description

Technical Field

[0001] This invention belongs to the field of motor core processing, and specifically relates to a double-rotation slotted resetting stamping method for forming iron cores with inclined slots. Background Technology

[0002] The skewed slot design of the motor core can reduce starting current, maintain the continuity of electromagnetic induction, eliminate the influence of high-order harmonics, weaken additional torque, reduce noise, and improve the starting performance of the motor. During the manufacturing process of the core, to meet the design requirements of the skewed slots, magnetic steel sheets are stacked in layers. The skewed slots on each magnetic steel sheet have a continuous deviation, and then these sheets are stacked sequentially to form the skewed slots.

[0003] During the stamping of the inclined grooves on each magnet sheet, the groove-shaped rotary mechanism rotates according to the positional difference of the inclined grooves between adjacent magnet sheets until the stamping of the inclined groove on the last magnet sheet of the core is completed. Then, the groove-shaped rotary mechanism is reset to prepare for the stamping of the first magnet sheet of the next core. However, during this process, the position of the inclined groove on the first magnet sheet of a core may not be at the same angle as the position of the inclined groove on the last magnet sheet of the previous core. This results in a misalignment between the inclined groove on the last magnet sheet of the previous core and the inclined groove on the first magnet sheet of the next core. When two cores are produced in the same batch, they may overlap during blanking, causing indentations of the inclined grooves on the two magnet sheets that come into contact with each other, resulting in product defects. Summary of the Invention

[0004] To address the aforementioned shortcomings, this invention proposes a double-rotation slotted resetting stamping method for forming iron cores with slots. This method avoids indentation when two adjacent iron cores are stacked, provided that the slotted groove positions on the first and last magnetic plates of an iron core are not at the same angle.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: a double-rotation slotted resetting stamping method for forming an iron core with inclined slots. The stamping method is used to form an iron core, which is formed by stacking multiple magnetic steel sheets. Multiple inclined slots are uniformly arrayed in the circumferential direction of the iron core. The inclined slots are inclined along the axial direction of the iron core. The stamping method includes a slotted rotary mechanism, a blanking rotary mechanism, and a strip. The strip is sequentially formed by slotted stamping through the slotted rotary mechanism and blanked and stacked by the blanking rotary mechanism. The slotted rotary mechanism performs rotary stamping on the slot on each magnetic steel sheet according to the number of stacked magnetic steel sheets and the inclination arc of the inclined slot. It resets when stamping the magnetic steel sheet of the next iron core. The blanking rotary mechanism rotates after forming an iron core according to the inclination arc of the inclined slot to receive the blanking and stacking of the next iron core, so that the slots of two adjacent magnetic steel sheets of two iron cores overlap.

[0006] Compared with the prior art, the advantages of the present invention are as follows: After the blanking and stacking of an iron core is completed, the slotted rotary mechanism is reset. At this time, the rotation angle of the slotted rotary mechanism is the inclination arc of the inclined slot. When the blanking rotary mechanism is also rotated at the same angle, the completed iron core can be driven to rotate synchronously, so that the inclined slot on the tail magnetic steel sheet is aligned with the first stamping area of ​​the stamping block on the slotted rotary mechanism. After the slotted rotary mechanism stamps the strip, the first magnetic steel sheet formed will have the same slot angle as the tail magnetic steel sheet of the previous iron core. This ensures that when the first magnetic steel sheet on the new iron core is stacked with the tail magnetic steel sheet of the previous iron core, the position of the inclined slot is consistent, and no indentation will be caused after stacking, so as to ensure product quality.

[0007] As an improvement, the arc between the axes of two adjacent inclined slots on the same magnet sheet is twice the arc of the inclined slots on the entire iron core.

[0008] As an improvement, the unloading rotary mechanism is equipped with two sets of positioning guide posts. The arc between the two sets of positioning guide posts is equal to the inclination arc of the inclined slot on the entire iron core. Two adjacent iron cores alternately use the two sets of positioning guide posts. Through this improvement, because the arc between the axes of two adjacent inclined slots on the same magnetic steel sheet is twice the inclination arc of the inclined slot on the entire iron core, after each stacking of inclined slots on an iron core, the angle difference between the first and last magnetic steel sheets is exactly half the arc between the axes of two adjacent inclined slots on the same magnetic steel sheet. Therefore, only two sets of positioning guide posts are needed. The unloading rotary mechanism is first fixedly connected to one set of positioning guide posts to complete the stacking of an iron core, and then turns to another set of positioning guide posts for fixing to receive the next iron core. This reciprocating motion ensures that the inclined slot of the last magnetic steel sheet of the previous iron core is aligned with the inclined slot of the first magnetic steel sheet of the next iron core each time a different iron core is received, without forming indentations.

[0009] As an improvement, the magnetic steel sheet has multiple fastening points evenly arrayed in the circumferential direction near the center. The arc between two adjacent fastening points is an integer multiple of the arc between two adjacent inclined slots. Through this improvement, the design of the fastening points is used to ensure the accuracy of stacking magnetic steel sheets of different layers on the same iron core.

[0010] As an improvement, the material feeding rotary mechanism rotates the arc between two adjacent fastening points each time it receives material. Through this improvement, the material feeding rotary mechanism rotates each time it receives material to eliminate the wall thickness difference of the strip and avoid repeated stacking due to the wall thickness difference of the strip. This prevents significant differences in height on different sides when the iron core is finally formed. The design that the arc between two adjacent fastening points is an integer multiple of the arc between two adjacent inclined slots ensures that the wall thickness difference is eliminated without affecting the forming quality of the inclined slots, thus guaranteeing the stacking quality of the iron core.

[0011] As an improvement, one of the iron cores is composed of 120 stacked magnetic steel sheets, with the inclined grooves having an arc angle of 15°, and the arc angle between the axes of two adjacent inclined grooves on the same magnetic steel sheet being 30°. The steps are as follows:

[0012] S1: The strip material is stamped and formed at the snap-in stamping station;

[0013] S2: The strip moves to the bottom of the trough-shaped rotary mechanism. After each magnetic steel sheet is stamped with an inclined groove, the trough-shaped rotary mechanism rotates 0.125°.

[0014] S3: After the 120 magnetic steel sheets are stamped and formed with inclined grooves, the groove rotation mechanism is reset and rotated 15 degrees to perform the stamping and forming of the inclined groove on the first magnetic steel sheet of the next iron core.

[0015] S4: The strip material is moved to the unloading rotary mechanism for unloading and stamping, and receives the magnetic steel sheets, which are then stacked to form an iron core;

[0016] S5: After 120 magnetic steel sheets have been stacked and unloaded, the unloading rotary mechanism rotates 15° along the reset rotary direction of the groove-shaped rotary mechanism.

[0017] S6: After completing the stacking of 120 magnetic steel sheets, the blanking rotary mechanism rotates 15° in the opposite direction of the reset rotary mechanism to complete the stacking and forming of the second iron core.

[0018] S7: The blanking rotary mechanism repeats S5 and S6 to blank and stack the magnetic steel sheets. Through this improvement, after the blanking and stacking of the previous iron core is completed, the angle of the inclined groove on the tail magnetic steel sheet of that iron core differs by 15° from the angle of the inclined groove on the first magnetic steel sheet. After all the magnetic steel sheets of an iron core are stamped, the slotted rotary mechanism rotates 15° to reset. At this time, the blanking rotary mechanism also rotates 15°, which drives the completed iron core to rotate synchronously, aligning the inclined groove on the tail magnetic steel sheet with the first stamping area of ​​the stamping block on the slotted rotary mechanism. Then, the slotted rotary mechanism stamps the strip material. Afterwards, the first magnetic steel sheet formed will have the same groove angle as the tail magnetic steel sheet of the previous iron core, thus ensuring that when the first magnetic steel sheet on the new iron core is superimposed with the tail magnetic steel sheet of the previous iron core, the position of the inclined groove is consistent, and no indentation will be caused after superposition, so as to ensure product quality. After the second iron core is stacked and formed, the groove rotation mechanism is reset in the original reset method, and the blanking rotation mechanism rotates in the opposite direction by 15°, that is, the blanking rotation mechanism is fixed to the positioning guide post when the first iron core is formed. If it repeats, multiple iron cores are formed in sequence in a single operation, and it is ensured that no indentation will occur between multiple iron cores.

[0019] As an improvement, there are three fastening points, which are evenly arranged in a circumferential array. The material dropping and rotating mechanism rotates 120° each time it receives a piece of material, and rotates 120+15° or 120-15° when it receives the first piece of magnet of the next iron core. Through this improvement, the array distribution of the fastening points is realized, and the different rotation adjustment requirements of the material dropping and rotating mechanism are met.

[0020] As an improvement, the material unloading rotary mechanism is provided with two sets of positioning guide columns, each set having a total of six columns. The included angle between the two sets of positioning guide columns is 15°. This improvement ensures the stability of the positioning guide columns in positioning the material unloading rotary mechanism, while also meeting the rotation requirements when receiving different iron cores. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the stamping method of the present invention.

[0022] Figure 2 This is a schematic diagram of the core stacking structure of the conventional stamping method of the present invention.

[0023] Figure 3 This is a schematic diagram of the stacked structure of the first magnetic steel sheet on one iron core and the last magnetic steel sheet on another iron core during the conventional stamping process.

[0024] Figure 4 This is a schematic diagram of the stacked structure of the first magnetic steel sheet on one iron core and the last magnetic steel sheet on another iron core in the process of stacking iron cores according to the present invention.

[0025] Figure 5 This is a schematic diagram of the rotation process of the groove-shaped rotary mechanism of the present invention.

[0026] Figure 6 This is a top view schematic diagram of the material feeding rotary mechanism of the present invention.

[0027] The following components are shown in the figure: 1. Iron core, 1.1. Magnet sheet, 1.1.1. First magnet sheet, 1.1.2. Tail magnet sheet, 1.2. Inclined groove, 1.3. Fastening point, 2. Groove rotating mechanism, 3. Unloading rotating mechanism, 3.1. Positioning guide column, 4. Strip material, 5. Fastening point stamping station. Detailed Implementation

[0028] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, a double-rotating slotted resetting stamping method for forming an iron core with inclined slots is disclosed. The stamping method is used to form an iron core 1, which is formed by stacking multiple magnetic steel sheets 1.1. Multiple inclined slots 1.2 are evenly arrayed circumferentially on the iron core 1. The inclined slots 1.2 are inclined circumferentially along the axial direction of the iron core 1. The stamping method includes a slotted rotary mechanism 2, a blanking rotary mechanism 3, and a strip 4. The strip 4 is sequentially passed through the slotted rotary mechanism 2 for slotted stamping and the blanking rotary mechanism 3 for blanking and stacking the magnetic steel sheets 1.1. The slotted rotary mechanism 2 performs rotary stamping on the slots on each magnetic steel sheet 1.1 according to the number of stacked magnetic steel sheets 1.1 and the inclination arc of the inclined slots 1.2. The strip is reset when stamping the next magnetic steel sheet 1.1 of the iron core 1. The blanking rotary mechanism 3 resets the strip according to the inclination arc of the inclined slots 1.2. After the forming of one iron core 1 is completed, it is rotated to receive the unloading of the next iron core 1 and stacked so that the grooves of the two adjacent magnetic steel sheets 1.1 of the two iron cores overlap. The arc between the axes of the two adjacent inclined grooves 1.2 on the same magnetic steel sheet 1.1 is twice the inclined arc of the inclined groove 1.2 on the entire iron core 1. The unloading rotation mechanism 3 is provided with two sets of positioning guide posts 3.1. The arc between the two sets of positioning guide posts 3.1 is equal to the inclined arc of the inclined groove 1.2 on the entire iron core 1. The two sets of positioning guide posts 3.1 are used alternately for the two adjacent iron cores 1. The magnetic steel sheet 1.1 has multiple fastening points 1.3 evenly arranged in the circumferential direction near the center. The arc between two adjacent fastening points 1.3 is an integer multiple of the arc between two adjacent inclined grooves 1.2. The unloading rotation mechanism 3 rotates the arc between two adjacent fastening points 1.3 each time it receives unloading material.

[0030] like Figure 2 , Figure 3As shown, when the iron core 1 is produced solely by the slotted rotary mechanism 2, the inclined groove 1.2 on the first magnetic steel sheet 1.1.1 of one iron core 1 and the inclined groove 1.2 on the last magnetic steel sheet 1.1.2 of another iron core 1 are misaligned. During the stacking process, indentations will be formed on both the first magnetic steel sheet 1.1.1 and the last magnetic steel sheet 1.1.2, thus affecting the quality of the iron core 1.

[0031] like Figure 4 As shown, when the trough-shaped rotary mechanism 2 and the unloading rotary mechanism 3 rotate simultaneously, the inclined groove 1.2 on the first magnetic steel sheet 1.1.1 on one iron core 1 overlaps with the inclined groove 1.2 on the tail magnetic steel sheet 1.1.2 on another iron core 1. This prevents indentations on the first magnetic steel sheet 1.1.1 and the tail magnetic steel sheet 1.1.2, and only creates misalignment at the snap-fit ​​point 1.3, without affecting the stacking of the magnetic steel sheets 1.1 on each iron core 1.

[0032] Example:

[0033] like Figure 1 , Figure 5 , Figure 6 As shown, one of the iron cores 1 is composed of 120 stacked magnetic steel sheets 1.1, with the inclined groove 1.2 having an inclination arc of 15°, and the arc between the axes of two adjacent inclined grooves 1.2 on the same magnetic steel sheet 1.1 being 30°. The steps are as follows:

[0034] S1: Strip 4 is stamped at the snap-in stamping station 5 to form snap-in 1.3;

[0035] S2: The strip 4 moves to the bottom of the grooved rotary mechanism 2. After each magnetic steel sheet 1.1 is stamped and formed on the inclined groove 1.2, the grooved rotary mechanism 2 rotates 0.125°.

[0036] S3: After the stamping of 120 magnetic steel sheets 1.1 with inclined grooves 1.2 is completed, the groove rotation mechanism 2 is reset and rotated 15 degrees to carry out the stamping of the first magnetic steel sheet 1.1.1 with inclined grooves 1.2 on the next iron core 1;

[0037] S4: The strip 4 moves to the unloading rotary mechanism 3 for unloading and stamping, and receives the magnetic steel sheet 1.1, so that they are stacked to form the iron core 1;

[0038] S5: After 120 magnetic steel sheets 1.1 are stacked and unloaded, the unloading rotary mechanism 3 rotates 15° along the reset rotary direction of the groove-shaped rotary mechanism 2;

[0039] S6: After completing the stacking of 120 magnetic steel sheets 1.1, the stacking and unloading mechanism 3 rotates 15° in the opposite direction of the reset rotation direction of the groove-shaped rotation mechanism 2 to complete the stacking and forming of the second iron core 1.

[0040] S7: The unloading rotary mechanism 3 repeats S5 and S6 to unload and stack the magnetic steel sheet 1.1.

[0041] There are three buckle points 1.3, which are evenly arranged in a circumferential array. In step S5, when receiving the same magnetic steel sheet 1.1 on the same iron core 1, the material feeding rotary mechanism 3 rotates 120°. When receiving the first magnetic steel sheet 1.1.1 of the next iron core 1, the material feeding rotary mechanism 3 rotates 135°. In step S6, when receiving the same magnetic steel sheet 1.1 on the same iron core 1, the material feeding rotary mechanism 3 rotates 120°. When receiving the first magnetic steel sheet 1.1.1 of the next iron core 1, the material feeding rotary mechanism 3 rotates 105°.

[0042] The material unloading rotary mechanism 3 is provided with two sets of positioning guide columns 3.1, each set of positioning guide columns 3.1 has a total of six columns, and the included angle between the two sets of positioning guide columns 3.1 is 15° to ensure the accuracy of rotation of 135° and 105°.

[0043] After the previous iron core 1 is blanked and stacked, the oblique groove 1.2 on the tail magnetic steel sheet 1.1.2 of the iron core 1 has a 15° difference in arc relative to the oblique groove 1.2 on the first magnetic steel sheet 1.1.1. After all the magnetic steel sheets 1.1 of an iron core 1 are stamped, the slotted rotary mechanism 2 rotates 15° to reset. At this time, the blanking rotary mechanism 3 also rotates 15°, which can drive the completed iron core 1 to rotate synchronously, so that the oblique groove 1.2 on the completed tail magnetic steel sheet 1.1.2 is aligned with the first stamping area of ​​the stamping block on the slotted rotary mechanism 2. Then, after the slotted rotary mechanism 2 stamps the strip 4, the first magnetic steel sheet 1.1.1 is formed. The groove angle on the tail magnetic sheet 1.1.2 of the previous iron core 1 is the same, thus ensuring that when the first magnetic sheet 1.1.1 on the new iron core 1 is superimposed on the tail magnetic sheet 1.1.2 of the previous iron core 1, the position of the inclined groove 1.2 is consistent, and no indentation will be caused after superposition, so as to ensure product quality. After the second iron core 1 is stacked and formed, the groove rotation mechanism 2 is reset in the original reset method, and the material dropping rotation mechanism 3 rotates in the opposite direction by 15°, that is, the material dropping rotation mechanism 3 rotates to fix with the positioning guide post 3.1 when the first iron core 1 is formed. If it repeats, multiple iron cores 1 are formed in sequence in a single operation, and it is ensured that no indentation will occur between multiple iron cores 1.

[0044] If there are four buckle points 1.3, and the four buckle points 1.3 are evenly arranged in a circumferential array, in step S5, each time a magnetic steel sheet 1.1 on the same iron core 1 is received, the material dropping and rotating mechanism 3 rotates 90°. When receiving the first magnetic steel sheet 1.1.1 of the next iron core 1, the material dropping and rotating mechanism 3 rotates 105°. In step S6, each time a magnetic steel sheet 1.1 on the same iron core 1 is received, the material dropping and rotating mechanism 3 rotates 90°. When receiving the first magnetic steel sheet 1.1.1 of the next iron core 1, the material dropping and rotating mechanism 3 rotates 75°.

[0045] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A double-rotation slotted resetting stamping method for forming an iron core with inclined slots, characterized in that: The stamping method is used to form an iron core (1), which is formed by stacking multiple magnetic steel sheets (1.1). The iron core (1) has multiple inclined slots (1.2) evenly arranged in the circumferential direction. The inclined slots (1.2) are inclined in the circumferential direction along the axial direction of the iron core (1). The stamping method includes a slotted rotary mechanism (2), a blanking rotary mechanism (3), and a strip (4). The strip (4) is sequentially formed by slotted stamping through the slotted rotary mechanism (2) and blanked and stacked by the blanking rotary mechanism (3). The slotted rotary mechanism (2) performs rotary stamping on the slots of each magnetic steel sheet (1.1) according to the number of stacked magnetic steel sheets (1.1) and the inclination arc of the inclined slots (1.2). It resets when stamping the magnetic steel sheet (1.1) of the next iron core (1). The blanking rotary mechanism (2) performs rotary stamping on the slots of each magnetic steel sheet (1.1). The mechanism (3) rotates after forming one iron core (1) according to the inclination arc of the inclined groove (1.2), and receives the unloading of the next iron core (1) and stacks them so that the grooves of the two adjacent magnetic steel sheets (1.1) of the two iron cores (1) overlap. There are multiple fastening points (1.3) evenly arranged in the circumferential direction near the center on the magnetic steel sheet (1.1). The arc between two adjacent fastening points (1.3) is an integer multiple of the arc between two adjacent inclined grooves (1.2). The unloading rotating mechanism (3) rotates the arc between two adjacent fastening points (1.3) each time it receives unloading. One iron core (1) is composed of 120 magnetic steel sheets (1.1) stacked together. The inclination arc of the inclined groove (1.2) is 15°. The arc between the axes of two adjacent inclined grooves (1.2) on the same magnetic steel sheet (1.1) is 30°. The steps are as follows: S1: The strip (4) is stamped to form the fasteners (1.3) at the fastener stamping station (5); S2: The strip (4) moves to the bottom of the grooved rotary mechanism (2). After each magnetic steel sheet (1.1) is stamped into the inclined groove (1.2), the grooved rotary mechanism (2) rotates 0.125°. S3: After the stamping of the inclined groove (1.2) on the 120 magnetic steel sheets (1.1) is completed, the groove rotation mechanism (2) is reset and rotated 15 degrees to carry out the stamping of the inclined groove (1.2) on the first magnetic steel sheet (1.1.1) on the next iron core (1); S4: The strip (4) moves to the unloading rotary mechanism (3) for unloading and stamping, and receives the magnetic steel sheet (1.1) so that it is stacked to form an iron core (1). S5: After 120 magnetic steel sheets (1.1) are stacked and unloaded, the unloading rotary mechanism (3) rotates 15° along the reset rotary direction of the groove-shaped rotary mechanism (2); S6: After completing the stacking of 120 magnetic steel sheets (1.1) again, the blanking rotary mechanism (3) rotates 15° in the opposite direction of the reset rotary mechanism (2) to complete the stacking and forming of the second iron core (1); S7: The material dropping and rotating mechanism (3) repeats S5 and S6 to drop and stack the magnetic steel sheet (1.1).

2. The double-rotation slotted resetting stamping method for forming an iron core with inclined slots according to claim 1, characterized in that: The material feeding rotary mechanism (3) is provided with two sets of positioning guide columns (3.1). Each set of positioning guide columns (3.1) has a total of six columns. The arc between the two sets of positioning guide columns (3.1) is equal to the inclination arc of the inclined groove (1.2) on the entire iron core (1). Two adjacent iron cores (1) alternately use the two sets of positioning guide columns (3.1).

3. The double-rotation slotted resetting stamping method for forming an iron core with inclined slots according to claim 1, characterized in that: There are three buckle points (1.3), and the three buckle points (1.3) are evenly arranged in a circumferential array. The material dropping and rotating mechanism (3) rotates 120° each time it receives the material, and rotates 120+15° or 120-15° when it receives the first magnetic steel sheet (1.1.1) of the next iron core (1).

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