A silicon steel sheet punching and shearing device and punching and shearing process

Abstract

An embodiment of the present invention relates to a silicon steel sheet punching and shearing device and a punching and shearing process. The device includes a punching press, a feeding table, a first die, a second die, and a third die; the feeding table is used for conveying a silicon steel strip to be processed; the first die is used for punching the silicon steel strip to form a first groove with a preset shape on the silicon steel strip, and one concave portion of the "I"-shaped silicon steel sheet is formed at the first groove; the second die is used for punching the silicon steel strip to form a second groove with a preset shape on the silicon steel strip, the second groove corresponds to the first groove, and the other concave portion of the "I"-shaped silicon steel sheet is formed at the second groove. The second die and the silicon steel strip can generate a relative displacement with a preset distance in the transverse direction of the silicon steel strip; the third die is used for shearing the silicon steel strip along the transverse direction of the silicon steel strip. The device can manufacture the "I"-shaped silicon steel sheet from silicon steel sheets at low cost and high efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of silicon steel sheet processing, and particularly relates to a silicon steel sheet punching and shearing device and a punching and shearing process. Background Art

[0002] The structure of a double-sided rotor and a single stator in the middle is a structure with better performance in a disc motor. The stator core of the stator can be divided into a stator core laminated with silicon steel sheets and a stator core sintered with magnetic powder according to the material; and can be divided into a stator core with pole shoes and a stator core without pole shoes according to the structure.

[0003] The stator core sintered with magnetic powder is composed of magnetic powder sintered blocks spliced together or a whole stator core sintered with magnetic powder. Compared with the stator core laminated with silicon steel sheets, this kind of stator core has a large magnetic resistance, poor magnetic conductivity, and large core loss, which affects the performance and efficiency of the motor.

[0004] The stator core with pole shoes ("I"-shaped) is a core structure in which the pole shoes and the core body are integrated. Compared with the stator core structure without pole shoes, the stator core with pole shoes can receive more magnetic flux, and the output performance of the motor is better. Moreover, the pole shoes can better protect the windings, so that the leakage magnetic field between the stator and the rotor rarely passes through the windings, reducing the eddy current loss generated by the leakage magnetic field in the windings.

[0005] In the "I"-shaped stator core laminated with silicon steel sheets for a yoke-free disc motor, the widths of the "I"-shaped silicon steel sheets are basically arranged in an arithmetic progression, and the outline of the main body of the laminated stator core is trapezoidal. For the silicon steel sheets in this trapezoidal outline stator core, the width of each sheet is different. The existing manufacturing methods include wire cutting and multi-mold punching. The wire cutting method has a long cycle, the cutting fluid and metal chips will pollute the surface of the silicon steel sheet, and the cost is relatively high. The multi-mold punching method requires separate molds for each width of the silicon steel sheet. Although the process cost is low, the mold cost is extremely high. For each different width of the silicon steel sheet, one mold is required. Summary of the Invention

[0006] In order to solve at least one of the above technical problems, an embodiment of the present invention provides a silicon steel sheet punching and shearing device and a punching and shearing process.

[0007] According to a first aspect of the present invention, an embodiment of the present invention provides a silicon steel sheet punching and shearing device.

[0008] A silicon steel sheet punching and shearing device is used for punching and shearing "I"-shaped silicon steel sheets, and includes a punching press, a feeding table, a first die, a second die, and a third die. The first die, the second die, and the third die are arranged on the punching press; the feeding table is used for conveying silicon steel strips to be processed; the first die is used for punching and shearing the silicon steel strip to form a first groove with a preset shape on the silicon steel strip, and one concave part of the "I"-shaped silicon steel sheet is formed at the first groove; the second die is used for punching and shearing the silicon steel strip to form a second groove with a preset shape on the silicon steel strip. The second groove corresponds to the first groove, and the other concave part of the "I"-shaped silicon steel sheet is formed at the second groove. The second die and the silicon steel strip can have a relative displacement with a preset distance in the transverse direction of the silicon steel strip; the third die is used for shearing the silicon steel strip along the transverse direction of the silicon steel strip.

[0009] Further, the first die includes n sets of dies arranged side by side, where n is an integer greater than or equal to 2.

[0010] Further, the second die includes n - 1 sets of dies arranged side by side.

[0011] Further, there is one punching press, and the first die, the second die, and the third die are sequentially arranged on the punching press according to the process.

[0012] Further, the punching press also has a punching die for punching holes in the silicon steel strip to form positioning holes; the punching press also has a positioning pin for positioning and cooperating with the positioning holes on the silicon steel strip.

[0013] Further, the punching press includes a first punching press and a second punching press arranged sequentially according to the process. The first die is arranged on the first punching press, and the second die and the third die are sequentially arranged on the second punching press according to the process.

[0014] Further, the punching press includes a first punching press and a second punching press arranged sequentially according to the process. The first die and the third die are sequentially arranged on the first punching press according to the process, and the second die is arranged on the second punching press.

[0015] Further, the feeding table includes a first feeding table and a second feeding table. The first feeding table is used for conveying the silicon steel strip to the first punching press, and the second feeding table is used for conveying the silicon steel strip to the second punching press.

[0016] Further, the first punching press also has a punching die for punching holes in the silicon steel strip to form positioning holes; the second punching press also has a positioning pin for positioning and cooperating with the positioning holes on the silicon steel strip.

[0017] According to the second aspect of the present invention, an embodiment of the present invention provides a silicon steel sheet punching and shearing process.

[0018] A punching and shearing process for silicon steel sheets, which is used for punching and processing "I"-shaped silicon steel sheets, is characterized by the following steps:

[0019] S1. Provide a silicon steel strip to be processed;

[0020] S2. Use a first die to punch and shear the silicon steel strip to form a first groove with a preset shape on the silicon steel strip, and the first groove constitutes one concave part of the "I"-shaped silicon steel sheet;

[0021] S3. Use a second die to punch and shear the silicon steel strip to form a second groove with a preset shape on the silicon steel strip. The second groove corresponds to the first groove, and the second groove constitutes the other concave part of the "I"-shaped silicon steel sheet. After the second die punches and shears once or multiple times, a relative displacement with a preset distance is generated between the second die and the silicon steel strip in the transverse direction of the silicon steel strip;

[0022] S4. Use a third die to cut the silicon steel strip along the transverse direction of the silicon steel strip.

[0023] Further, the first die includes n sets of dies arranged side by side, and n is an integer greater than or equal to 2.

[0024] Further, the second die includes n - 1 sets of dies arranged side by side.

[0025] Further, step S3 is before step S4; or, step S4 is before step S3.

[0026] Further, in step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets on the silicon steel strip, and positioning holes are processed at the preset interval by using the punching die; in step S3, it further includes the step of positioning the silicon steel strip by inserting positioning pins into the positioning holes; in step S4, it further includes the step of positioning the silicon steel strip by inserting positioning pins into the positioning holes.

[0027] Further, in step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets on the silicon steel strip; in step S3, the length of the silicon steel strip punched and sheared by the second die in the longitudinal direction is greater than the preset length of the "I"-shaped silicon steel sheet.

[0028] The punching and shearing equipment and process for silicon steel sheets according to the embodiments of the present invention can be used to produce silicon steel sheets for the stator core of a yokeless disc motor. The silicon steel sheets have an "I"-shaped profile with a continuously varying width and are laminated into a trapezoid. For the punching and shearing equipment according to the embodiments of the present invention, regardless of the number of silicon steel sheets that the stator core is composed of, the equipment only requires three sets of punching and shearing dies, and the die cost is low; the equipment / process can use oriented silicon steel materials with low cost and high performance to make the stator core, instead of using powder sintered materials with high cost and low performance; by only changing the shape of the dies of the equipment, the profiles of the stator core and the pole shoe can be customized, which is convenient for optimizing the stator core. For example, it is easy to realize an arc-shaped or curved-profile stator core and pole shoe; by controlling the relative position between the silicon steel strip and the die, the equipment / process can make a stator core with a trapezoidal profile, a stator core with a stepped profile or a stator core with other shapes, and can easily meet different requirements with high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. 1 is a schematic diagram of the punching and shearing equipment proposed in Embodiment 1 of the present invention.

[0030] Figure 2 FIG. 2 is a schematic diagram showing that after the first die 30 continuously punches the lateral edges of both sides of the silicon steel strip according to a preset program in Embodiment 1 of the present invention, first grooves 60 with a preset shape are formed on both lateral sides of the silicon steel strip in the lateral direction.

[0031] Figure 3 FIG. 3 is a schematic diagram showing that after the second die 40 punches the middle part of the silicon steel strip in Embodiment 1 of the present invention, a second groove 70 is obtained, and each time the punching is performed, the second die 40 and the silicon steel strip are displaced by a preset distance in the Y direction.

[0032] Figure 4 FIG. 4 is a schematic diagram showing that after the third die 50 continuously cuts the silicon steel strip along the lateral direction of the silicon steel strip according to a preset program in Embodiment 1 of the present invention, multiple pairs of "I"-shaped silicon steel sheet groups are obtained.

[0033] Figure 5 FIG. 5 is a schematic structural diagram of a stator core with a trapezoidal profile formed by laminating the "I"-shaped silicon steel sheets obtained after punching, where the second die and the silicon steel strip are displaced by a preset distance in the Y direction according to a preset program each time, and the second die 40 and the third die 50 perform punching operations respectively in the embodiments of the present invention.

[0034] Figure 6 FIG. 6 is a schematic structural diagram of a stator core with a stepped profile formed by laminating the "I"-shaped silicon steel sheets obtained after punching, where the second die and the silicon steel strip are displaced by a preset distance in the Y direction according to a preset program each time, and the second die 40 and the third die 50 perform punching operations N times (N is an integer greater than 1, that is, the number of silicon steel sheets in each step of the stator core with a stepped profile) respectively in the embodiments of the present invention, and multiple groups of "I"-shaped silicon steel sheets with different widths are obtained, and each group of "I"-shaped silicon steel sheets includes multiple silicon steel sheets.

[0035] Figure 7 It is a schematic diagram of the punching and shearing equipment proposed in Embodiment 2 and Embodiment 3 of the present invention.

[0036] Figure 8 It is a schematic diagram of the punching and shearing equipment proposed in Embodiment 4 of the present invention.

[0037] Figure 9 In Embodiment 4 of the present invention, after the first die punches and shears, the third die 50 continuously shears the silicon steel strip along the transverse direction of the silicon steel strip according to a preset program to obtain a plurality of "I"-shaped large silicon steel sheets.

[0038] Figure 10 In Embodiment 5 of the present invention, after the first die 30 including n sets of dies (n>2) continuously punches and shears the two lateral edges of the silicon steel strip according to a preset program, first grooves 60 with a preset shape are formed on both sides of the silicon steel strip in the transverse direction.

[0039] Figure 11 In Embodiment 5 of the present invention, the second die continuously punches and shears the middle part of the silicon steel strip according to a preset program to form a second groove with a preset shape in the middle part of the silicon steel strip.

[0040] Figure 12 In Embodiment 5 of the present invention, the third die continuously shears the silicon steel strip along the transverse direction of the silicon steel strip according to a preset program to obtain multiple pairs of "I"-shaped silicon steel sheet groups.

[0041] Figure 13 It is a schematic diagram of using the punching die to process positioning holes 80 at the preset intervals in the embodiments of the present invention.

[0042] Figure 14 It shows that in the embodiments of the present invention, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip, and the length of the punching and shearing by the second die 40 in the longitudinal direction of the silicon steel strip is greater than the preset length of the "I"-shaped silicon steel sheet.

[0043] Figure 15 It shows that if the positioning of the silicon steel strip has a slight deviation, the pole shoe at one end of the "I"-shaped silicon steel sheet will be smaller than the preset value, while the pole shoe at the other end will be larger than the preset value.

[0044] Figure 16 It shows that when a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip, and the length of the punching and shearing by the second die 40 in the longitudinal direction of the silicon steel strip is greater than the preset length of the "I"-shaped silicon steel sheet, even if the positioning of the silicon steel strip has a slight deviation, the pole shoes at both ends of the "I"-shaped silicon steel sheet can still match the preset value. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. However, those skilled in the art will understand that the present invention is not limited to the drawings and the following embodiments.

[0046] Referring to Figures 1 - 16 , according to the first aspect of the present invention, an embodiment of the present invention provides a silicon steel sheet punching and shearing device for punching and processing "I"-shaped silicon steel sheets. The punching and shearing device includes a punching press, a feeding table, a first die, a second die, and a third die. The first die, the second die, and the third die are arranged on the punching press; the feeding table is used for conveying the silicon steel strip to be processed; the first die is used for punching the silicon steel strip to form a first groove with a preset shape on the silicon steel strip, and the first groove forms one concave portion of the "I"-shaped silicon steel sheet; the second die is used for punching the silicon steel strip to form a second groove with a preset shape on the silicon steel strip. The second groove corresponds to the first groove, and the second groove forms the other concave portion of the "I"-shaped silicon steel sheet. The second die and the silicon steel strip can have a relative displacement with a preset distance in the transverse direction of the silicon steel strip; the third die is used for shearing the silicon steel strip along the transverse direction of the silicon steel strip.

[0047] In one embodiment, the first die includes n sets of dies arranged side by side, where n is an integer greater than or equal to 2.

[0048] Further, the second die includes n - 1 sets of dies.

[0049] In one embodiment, there is one punching press, and the first die, the second die, and the third die are arranged on the punching press in sequence according to the process.

[0050] In another embodiment, the punching press includes a first punching press and a second punching press arranged in sequence according to the process. The first die is arranged on the first punching press, and the second die and the third die are arranged on the second punching press in sequence according to the process.

[0051] In another embodiment, the punching press includes a first punching press and a second punching press arranged in sequence according to the process. The first die and the third die are arranged on the first punching press in sequence according to the process, and the second die is arranged on the second punching press.

[0052] According to the second aspect of the present invention, an embodiment of the present invention provides a silicon steel sheet punching and shearing process for punching and processing "I"-shaped silicon steel sheets. The punching and shearing process includes the following steps:

[0053] S1. Provide a silicon steel strip to be processed;

[0054] S2. Use the first die to punch and cut the silicon steel strip to form a first groove with a preset shape on the silicon steel strip, and the first groove constitutes one side recess of the "I"-shaped silicon steel sheet;

[0055] S3. Use the second die to punch and cut the silicon steel strip to form a second groove with a preset shape on the silicon steel strip. The second groove corresponds to the first groove, and the second groove constitutes the other side recess of the "I"-shaped silicon steel sheet. After the second die punches and cuts once or multiple times, a relative displacement with a preset distance is generated in the lateral direction of the silicon steel strip between the second die and the silicon steel strip;

[0056] S4. Use the third die to cut the silicon steel strip along the lateral direction of the silicon steel strip.

[0057] In one embodiment, step S3 is before step S4.

[0058] In another embodiment, step S4 is before step S3.

[0059] Next, the present invention will be further described in detail through specific embodiments. It should be noted that the following specific embodiments are only for enabling those skilled in the art to fully understand the present invention and do not impose any limitations on the present invention.

[0060] Embodiment 1

[0061] As Figure 1As shown in the figure, the silicon steel sheet punching and shearing equipment of this embodiment includes a punching press 10, a feeding table 20, a first die 30, a second die 40, and a third die 50; the punching press 10 includes a first punching press 11 and a second punching press 12, the feeding table 20 includes a first feeding table 20 and a second feeding table 20, the first feeding table 20 is used to convey silicon steel strips to the first punching press 11, and the second feeding table 20 is used to convey silicon steel strips to the second punching press 12; the first die 30 is arranged on the first punching press 11, and the second die 40 and the third die 50 are arranged on the second punching press 12 in sequence according to the process; the first die 30 includes two sets of dies arranged side by side, and the first die 30 is used to punch and shear the silicon steel strip to form a first groove 60 with a preset shape on the silicon steel strip, and the first groove 60 constitutes one side recess of the "I"-shaped silicon steel sheet; the second die 40 is used to punch and shear the silicon steel strip to form a second groove 70 with a preset shape on the silicon steel strip, the second groove 70 corresponds to the first groove 60, and the second groove 70 constitutes the other side recess of the "I"-shaped silicon steel sheet, and the second die 40 and the silicon steel strip can produce a relative displacement with a preset distance in the lateral direction of the silicon steel strip; the third die 50 is used to cut the silicon steel strip along the lateral direction of the silicon steel strip. In another embodiment, the first die 30 is a set of die, and a relative displacement can be generated between the first die 30 and the silicon steel strip. During the punching and shearing operation, the first die 30 first punches one side of the silicon steel strip, and then moves the first die 30 and / or the silicon steel strip in the lateral direction of the silicon steel strip, and then punches the other side of the silicon steel strip.

[0062] Preferably, the first punching press 11 also has a punching die for punching holes in the silicon steel strip to form positioning holes 80; the second punching press 12 also has positioning pins for positioning and cooperating with the positioning holes 80 on the silicon steel strip.

[0063] On the workbench surface, the feeding direction is defined as the X direction (i.e., the longitudinal direction of the silicon steel strip), and the direction perpendicular to the feeding direction is the Y direction (i.e., the lateral direction of the silicon steel strip), with precise displacement in the Y direction. The first die 30, the second die 40, and the third die 50 do not generate displacement in the XY direction, and the second feeding table 20 and the silicon steel strip can move in the Y direction.

[0064] Using the punching and shearing equipment of this embodiment, the punching and shearing process for punching "I"-shaped silicon steel sheets includes the following steps:

[0065] S1. Provide the silicon steel strip to be processed;

[0066] S2. Transfer the silicon steel strip to the first punching machine 11 through the first feeding table 20. After adjusting the distance between the two sets of cutting dies of the first cutting die 30 in the Y direction, the first cutting die 30 remains stationary in the XY direction. When the first punching machine 11 operates and the silicon steel strip is being transferred in the X direction, the first cutting die 30 continuously punches and shears the lateral edges on both sides of the silicon steel strip according to a preset program, so as to form first grooves 60 with a preset shape on both lateral sides of the silicon steel strip (as shown in Figure 2 ), and the first grooves 60 form one concave part on one side of the "I"-shaped silicon steel sheet;

[0067] S3. Transfer the silicon steel strip punched by the first cutting die 30 to the second punching machine 12 through the second feeding table 20. When the second punching machine 12 operates and the silicon steel strip is being transferred in the X direction, the second cutting die 40 continuously punches and shears the middle part of the silicon steel strip according to a preset program, so as to form second grooves 70 with a preset shape in the middle of the silicon steel strip. The second grooves 70 correspond to the first grooves 60, and the second grooves 70 form the other concave part on the other side of the "I"-shaped silicon steel sheet. Each time the second cutting die 40 punches once or multiple times, the second feeding table 20 is controlled by a servo control system to make the second feeding table 20 and the silicon steel strip accurately move a preset distance in the Y direction (as shown in Figure 3 );

[0068] S4. When the silicon steel strip is being transferred in the X direction, the third cutting die 50 continuously cuts the silicon steel strip along the lateral direction of the silicon steel strip according to a preset program, so as to obtain multiple pairs of "I"-shaped silicon steel sheet groups (as shown in Figure 4 ).

[0069] Preferably, in the step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip (refer to Figure 13 , the interval between the two dotted lines between two adjacent "I"-shaped silicon steel sheets in the X direction is the preset interval), and positioning holes 80 are processed at the preset interval by using the punching die; in the step S3, it further includes the step of using a positioning pin to extend into the positioning holes 80 to position the silicon steel strip; in the step S4, it further includes the step of using a positioning pin to extend into the positioning holes 80 to position the silicon steel strip.

[0070] More preferably, in the step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip; in the step S3, the length of the silicon steel strip punched by the second cutting die 40 in the longitudinal direction is greater than the preset length of the "I"-shaped silicon steel sheet (i.e., over-punching, as shown in Figure 14 ).

[0071] In this embodiment, by controlling the moving distance of the second feeding table 20 and the silicon steel strip in the Y direction, the silicon steel sheets obtained after being punched by the second cutting die 40 and the third cutting die 50 can be stacked and formed into stator cores with different profiles.

[0072] For example, every time the second material feeding table 20 and the silicon steel strip move a preset distance in the Y direction according to a preset program, the second die 40 and the third die 50 respectively perform a punching operation. The obtained "I"-shaped silicon steel sheets can be stacked and pressed into a stator core with a trapezoidal profile (as Figure 5 shown).

[0073] For another example, every time the second material feeding table 20 and the silicon steel strip move a preset distance in the Y direction according to a preset program, the second die 40 and the third die 50 respectively perform N punching operations (N is an integer greater than 1, that is, the number of silicon steel sheets for each step of the stator core with a stepped profile). After punching, multiple groups of "I"-shaped silicon steel sheets with different widths are obtained. Each group of "I"-shaped silicon steel sheets includes multiple silicon steel sheets. The obtained "I"-shaped silicon steel sheets can be stacked and pressed into a stator core with a stepped profile (as Figure 6 shown).

[0074] In a preferred solution of the embodiment of the present invention, the silicon steel strip is accurately positioned through the positioning holes 80 and the positioning pins, and then the second die 40 and the third die 50 work, which can avoid the deviation of the position of the silicon steel strip during punching, thereby avoiding the defects that the sizes of the obtained "I"-shaped silicon steel sheets are inconsistent and the shape of the stacked and formed stator core is poor. In a further preferred solution, by making the length of the punching of the second die 40 in the longitudinal direction (X direction) of the silicon steel strip greater than the preset length of the "I"-shaped silicon steel sheet (i.e., over-punching), even if there is a slight deviation in the positioning of the silicon steel strip when the third die 50 cuts it transversely, no spikes will be formed on the silicon steel sheet, thereby avoiding the defects that the spikes damage the die and accelerate the wear rate of the die, and also avoiding the distortion of the silicon steel sheet during processing.

[0075] If there is a slight deviation in the positioning of the silicon steel strip, it will cause the pole shoe at one end of the "I"-shaped silicon steel sheet to be smaller than the preset value, while the pole shoe at the other end is larger than the preset value, and steps and spikes are formed, resulting in obvious defects in the shape of the silicon steel sheet (as Figure 15 shown), and these spikes will also accelerate the wear rate of the die, and even cause the distortion of the silicon steel sheet. When the above preferred solution is adopted, the above defects can be avoided (as Figure 16 shown).

[0076] Embodiment 2

[0077] Refer to Figure 7, the silicon steel sheet punching and shearing equipment of this embodiment includes a punching press 10, a feeding table 20, a first die 30, a second die 40 and a third die 50; the first die 30, the second die 40 and the third die 50 are sequentially arranged on the punching press 10 according to the process; the first die 30 includes two sets of dies arranged side by side, and the first die 30 is used for punching and shearing a silicon steel strip to form a first groove 60 with a preset shape on the silicon steel strip, and the first groove 60 constitutes one side concave part of the "I"-shaped silicon steel sheet; the second die 40 is used for punching and shearing the silicon steel strip to form a second groove 70 with a preset shape on the silicon steel strip, the second groove 70 corresponds to the first groove 60, and the second groove 70 constitutes the other side concave part of the "I"-shaped silicon steel sheet, and the second die 40 and the silicon steel strip can generate a relative displacement with a preset distance in the lateral direction of the silicon steel strip; the third die 50 is used for shearing the silicon steel strip along the lateral direction of the silicon steel strip.

[0078] Preferably, the punching press 10 further has a punching die for punching holes in the silicon steel strip to form positioning holes 80; the punching press 10 further has positioning pins for positioning and cooperating with the positioning holes 80 on the silicon steel strip.

[0079] On the workbench surface, the feeding direction is defined as the X direction (i.e., the longitudinal direction of the silicon steel strip), and the direction perpendicular to the feeding direction is the Y direction (i.e., the lateral direction of the silicon steel strip), with precise displacement in the Y direction. The first die 30, the second die 40 and the third die 50 do not generate displacement in the XY direction, and the feeding table 20 and the silicon steel strip can move in the Y direction.

[0080] Using the punching and shearing equipment of this embodiment, the punching and shearing process for punching "I"-shaped silicon steel sheets includes the following steps:

[0081] S1. Provide the silicon steel strip to be processed;

[0082] S2. Transfer the silicon steel strip to the punching press 10 through the feeding table 20. After adjusting the distance between the two sets of dies of the first die 30 in the Y direction, during the transfer of the silicon steel strip in the X direction, the punching press 10 works, and the first die 30 continuously punches and shears the lateral edges of both sides of the silicon steel strip according to a preset program to form first grooves 60 with a preset shape on both lateral sides of the silicon steel strip, and the first grooves 60 constitute one side concave part of the "I"-shaped silicon steel sheet;

[0083] S3. Continuously convey the silicon steel strip after being punched by the first die 30 through the feeding table 20. The punching press 10 operates. During the conveyance of the silicon steel strip in the X direction, the second die 40 continuously punches the middle part of the silicon steel strip according to a preset program to form a second groove 70 with a preset shape in the middle of the silicon steel strip. The second groove 70 corresponds to the first groove 60, and the second groove 70 forms the other concave part of the "I"-shaped silicon steel sheet. Each time the second die 40 punches once or multiple times, the feeding table 20 and the first die 30 are controlled by a servo control system to move the feeding table 20, the first die 30, and the silicon steel strip a preset distance in the Y direction, but the relative positions among the feeding table 20, the first die 30, and the silicon steel strip remain unchanged;

[0084] S4. During the conveyance of the silicon steel strip in the X direction, the third die 50 continuously cuts the silicon steel strip along the transverse direction of the silicon steel strip according to a preset program to obtain multiple pairs of "I"-shaped silicon steel sheet groups.

[0085] Refer to Figure 13 , preferably, in the step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip, and positioning holes 80 are processed at the preset interval by using the punching die; in the step S3, it further includes the step of using a positioning pin to extend into the positioning holes 80 to position the silicon steel strip; in the step S4, it further includes the step of using a positioning pin to extend into the positioning holes 80 to position the silicon steel strip.

[0086] More preferably, in the step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip; in the step S3, the length of the punching by the second die 40 in the longitudinal direction of the silicon steel strip is greater than the preset length of the "I"-shaped silicon steel sheet (i.e., over-punching, as Figure 14 shown).

[0087] Similarly, in this embodiment, by controlling the moving distance of the feeding table 20 and the silicon steel strip in the Y direction, the silicon steel sheets obtained after being punched by the second die 40 and the third die 50 can be stacked to form stator cores with different profiles.

[0088] For example, every time the feeding table 20 and the silicon steel strip move a preset distance in the Y direction according to a preset program, the second die 40 and the third die 50 punch once respectively, and the obtained "I"-shaped silicon steel sheets can be stacked into a stator core with a trapezoidal profile (as Figure 5 shown).

[0089] For another example, every time the feeding table 20, the first die 30 and the silicon steel strip move a preset distance in the Y direction according to a preset program, the second die 40 and the third die 50 punch and shear N times (N is an integer greater than 1, that is, the number of silicon steel sheets in each step of the stator core with a stepped profile), and after punching and shearing, multiple groups of "I"-shaped silicon steel sheets with different widths are obtained. Each group of "I"-shaped silicon steel sheets includes multiple silicon steel sheets, and the obtained "I"-shaped silicon steel sheets can be laminated into a stator core with a stepped profile (as Figure 6 shown).

[0090] Embodiment 3

[0091] Referring to Figure 7 , the silicon steel sheet punching and shearing equipment of this embodiment is basically the same as that of Embodiment 2, including a punching press 10, a feeding table 20, a first die 30, a second die 40 and a third die 50; the first die 30, the second die 40 and the third die 50 are sequentially arranged on the punching press 10 according to the process; the first die 30 includes two sets of dies arranged side by side, and the first die 30 is used for punching and shearing the silicon steel strip to form a first groove 60 with a preset shape on the silicon steel strip, and one side concave part of the "I"-shaped silicon steel sheet is formed at the first groove 60; the second die 40 is used for punching and shearing the silicon steel strip to form a second groove 70 with a preset shape on the silicon steel strip, the second groove 70 corresponds to the first groove 60, and the other side concave part of the "I"-shaped silicon steel sheet is formed at the second groove 70, and the second die 40 and the silicon steel strip can generate a relative displacement with a preset distance in the lateral direction of the silicon steel strip; the third die 50 is used for shearing the silicon steel strip along the lateral direction of the silicon steel strip.

[0092] Preferably, the punching press 10 further has a punching die for punching positioning holes 80 in the silicon steel strip; the punching press 10 further has positioning pins for positioning and cooperating with the positioning holes 80 on the silicon steel strip

[0093] On the workbench surface, the feeding direction is defined as the X direction (i.e., the longitudinal direction of the silicon steel strip), and the direction perpendicular to the feeding direction is the Y direction (i.e., the lateral direction of the silicon steel strip), with precise displacement in the Y direction. The first die 30 and the third die 50 do not generate displacement in the XY direction, and the second die 40 can move in the Y direction. The difference from Embodiment 2 lies in the different movement modes.

[0094] Using the punching and shearing equipment of this embodiment, the punching and shearing process for punching "I"-shaped silicon steel sheets includes the following steps:

[0095] S1. Provide the silicon steel strip to be processed; [[ID=***]]

[0096] S2. Transfer the silicon steel strip to the punching machine 10 through the feeding table 20. After adjusting the distance between the two sets of cutting dies of the first cutting die 30 in the Y direction, the first cutting die 30 remains stationary in the XY direction, and the first punching machine 11 operates. The first cutting die 30 continuously punches and shears the lateral edges of the silicon steel strip according to a preset program to form first grooves 60 with a preset shape on both lateral sides of the silicon steel strip, and one concave part of the "I"-shaped silicon steel sheet is formed at the first grooves 60;

[0097] S3. Continuously transfer the silicon steel strip punched by the first cutting die 30 through the feeding table 20, and the punching machine 10 operates. During the transfer of the silicon steel strip in the X direction, the second cutting die 40 continuously punches and shears the middle part of the silicon steel strip according to a preset program to form second grooves 70 with a preset shape in the middle of the silicon steel strip. The second grooves 70 correspond to the first grooves 60, and the other concave part of the "I"-shaped silicon steel sheet is formed at the second grooves 70. Each time the second cutting die 40 punches and shears once or multiple times, the feeding table 20 and the second cutting die 40 are controlled by a servo control system to move the second cutting die 40 a preset distance in the Y direction;

[0098] S4. During the transfer of the silicon steel strip in the X direction, the third cutting die 50 continuously cuts the silicon steel strip along the lateral direction of the silicon steel strip according to a preset program to obtain multiple pairs of "I"-shaped silicon steel sheet groups.

[0099] Refer to Figure 13 , preferably, in the step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip, and positioning holes 80 are processed at the preset interval by using the punching die; in the step S3, it further includes the step of positioning the silicon steel strip by inserting positioning pins into the positioning holes 80; in the step S4, it further includes the step of positioning the silicon steel strip by inserting positioning pins into the positioning holes 80.

[0100] More preferably, in the step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip; in the step S3, the length of the silicon steel strip punched by the second cutting die 40 in the longitudinal direction is greater than the preset length of the "I"-shaped silicon steel sheet (i.e., over-punching, as Figure 14 shown).

[0101] Similarly, in this embodiment, by controlling the moving distance of the second cutting die 40 in the Y direction, the silicon steel sheets obtained after punching by the second cutting die 40 and the third cutting die 50 can be stacked and formed into stator cores with different profiles.

[0102] For example, every time the second cutting die 40 moves a preset distance in the Y direction according to a preset program, the second cutting die 40 and the third cutting die 50 punch and shear once respectively, and the "I"-shaped silicon steel sheets obtained after punching can be stacked into a stator core with a trapezoidal profile (as Figure 5 shown).

[0103] For another example, every time the second die 40 moves a preset distance in the Y direction according to a preset program, the second die 40 and the third die 50 punch and shear N times (N is an integer greater than 1, that is, the number of silicon steel sheets of each step of the stator core with a stepped profile), and after punching and shearing, multiple groups of "I"-shaped silicon steel sheets with different widths are obtained. Each group of "I"-shaped silicon steel sheets includes multiple silicon steel sheets, and the obtained "I"-shaped silicon steel sheets can be laminated into a stator core with a stepped profile (as Figure 6 shown).

[0104] Example 4

[0105] Referring to Figure 8 , the silicon steel sheet punching and shearing equipment of this embodiment includes a punching press 10, a feeding table 20, a first die 30, a second die 40 and a third die 50; the punching press 10 includes a first punching press 11 and a second punching press 12, the feeding table 20 includes a first feeding table 20 and a second feeding table 20, the first feeding table 20 is used to convey a silicon steel strip to the first punching press 11, and the second feeding table 20 is used to convey a silicon steel strip to the second punching press 12; the first die 30 and the third die 50 are sequentially arranged on the first punching press 11 according to the process, and the second die 40 is arranged on the second punching press 12; the first die 30 includes two sets of dies arranged side by side, and the first die 30 is used to punch and shear the silicon steel strip to form a first groove 60 with a preset shape on the silicon steel strip, and one side concave part of the "I"-shaped silicon steel sheet is formed at the first groove 60; the second die 40 is used to punch and shear the silicon steel strip to form a second groove 70 with a preset shape on the silicon steel strip, the second groove 70 corresponds to the first groove 60, and the other side concave part of the "I"-shaped silicon steel sheet is formed at the second groove 70, and the second die 40 and the silicon steel strip can produce a relative displacement of a preset distance in the lateral direction of the silicon steel strip; the third die 50 is used to cut the silicon steel strip along the lateral direction of the silicon steel strip.

[0106] Preferably, the first punching press 11 further has a punching die for punching holes in the silicon steel strip to form positioning holes 80; both the first punching press 11 and the second punching press 12 have positioning pins for positioning and cooperating with the positioning holes 80 on the silicon steel strip

[0107] On the workbench surface, the feeding direction is defined as the X direction (i.e., the longitudinal direction of the silicon steel strip), and the direction perpendicular to the feeding direction is the Y direction (i.e., the lateral direction of the silicon steel strip), with precise displacement in the Y direction. The first die 30, the second die 40 and the third die 50 do not produce displacement in the XY direction, and the second feeding table 20 and the silicon steel strip can move in the Y direction.

[0108] Using the punching and shearing equipment of this embodiment, the punching and shearing process for punching and shearing "I"-shaped silicon steel sheets includes the following steps:

[0109] S1. Provide the silicon steel strip to be processed;

[0110] S2. Transfer the silicon steel strip to the first punching press 11 through the first feeding table 20. After adjusting the distance between the two sets of cutting dies of the first cutting die 30 in the Y direction, the first cutting die 30 remains stationary in the XY direction. When the first punching press 11 operates and the silicon steel strip is being transferred in the X direction, the first cutting die 30 continuously punches and shears the two lateral edges of the silicon steel strip according to a preset program, so as to form first grooves 60 with a preset shape on both lateral sides of the silicon steel strip, and the first grooves 60 form one concave part of the "I"-shaped silicon steel sheet;

[0111] S3. During the transfer of the silicon steel strip in the X direction, the third cutting die 50 continuously cuts the silicon steel strip transversely along the preset program to obtain a plurality of "I"-shaped large silicon steel sheets (as Figure 9 shown).

[0112] S4. Transfer the silicon steel strip punched by the third cutting die 50 to the second punching press 12 through the second feeding table 20. When the second punching press 12 operates and the silicon steel strip is being transferred in the X direction, the second cutting die 40 continuously punches and shears the middle part of the silicon steel strip according to a preset program, so as to form second grooves 70 with a preset shape in the middle part of the silicon steel strip. The second grooves 70 correspond to the first grooves 60, and the second grooves 70 form the other concave part of the "I"-shaped silicon steel sheet. Each time the second cutting die 40 punches and shears once or multiple times, the second feeding table 20 is controlled by a servo control system to accurately move the second feeding table 20 and the silicon steel strip a preset distance in the Y direction. After the third cutting die 50 finishes punching and shearing, multiple pairs of "I"-shaped silicon steel sheet groups are obtained.

[0113] Example 5

[0114] The silicon steel sheet punching and shearing equipment of this embodiment includes a punching press, a feeding table, a first die, a second die, and a third die; the punching press includes a first punching press and a second punching press, the feeding table includes a first feeding table and a second feeding table, the first feeding table is used to convey a silicon steel strip to the first punching press, and the second feeding table is used to convey a silicon steel strip to the second punching press; the first die and the third die are sequentially arranged on the first punching press according to the process, and the second die is arranged on the second punching press; the first die includes n sets of dies arranged side by side, where n is an integer greater than 2, and the first die is used to punch and shear the silicon steel strip to form a first groove with a preset shape on the silicon steel strip, and the first groove forms one concave part of the "I"-shaped silicon steel sheet; the second die is used to punch and shear the silicon steel strip to form a plurality of second grooves with a preset shape on the silicon steel strip, the second grooves correspond to the first grooves, and the second grooves form the other concave part of the "I"-shaped silicon steel sheet, and the second die and the silicon steel strip can generate a relative displacement with a preset distance in the transverse direction of the silicon steel strip; the third die is used to cut the silicon steel strip along the transverse direction of the silicon steel strip. In one embodiment, the second die includes n - 1 sets of dies arranged side by side. In another embodiment, the second die can be less than n - 1 sets of dies. In this embodiment, the second die and the silicon steel strip can move relative to each other multiple times in the transverse direction of the silicon steel strip.

[0115] Preferably, the first punching press also has a punching die for punching holes in the silicon steel strip to form positioning holes 80; the second punching press also has a positioning pin for positioning and cooperating with the positioning holes on the silicon steel strip.

[0116] On the workbench surface, the feeding direction is defined as the X direction (i.e., the longitudinal direction of the silicon steel strip), and the direction perpendicular to the feeding direction is the Y direction (i.e., the transverse direction of the silicon steel strip). In one embodiment, the first die, the second die, and the third die do not generate displacement in the X and Y directions, and the second feeding table and the silicon steel strip can move in the Y direction.

[0117] Refer to Figures 10 - 13 , using the punching and shearing equipment of this embodiment, the punching and shearing process for punching the "I"-shaped silicon steel sheet includes the following steps:

[0118] S1. Provide a silicon steel strip to be processed;

[0119] S2. Convey the silicon steel strip to the first punching press through the first feeding table. After adjusting the spacing of the multiple sets of dies of the first die in the Y direction, the first die does not move in the X and Y directions, and the first punching press works. During the conveyance of the silicon steel strip in the X direction, the first die continuously punches and shears the two lateral edges and the middle part of the silicon steel strip according to a preset program to form a first groove with a preset shape (as shown in Figure 10 ), and the first groove forms one concave part of the "I"-shaped silicon steel sheet;

[0120] S3. Transfer the silicon steel strip after being punched by the first die to the second punching machine through the second feeding table. The second punching machine works. During the transfer of the silicon steel strip in the X direction, the second die continuously punches the middle part of the silicon steel strip according to a preset program to form a second groove with a preset shape in the middle part of the silicon steel strip (as shown in Figure 11 ), the second groove corresponds to the first groove, and the second groove forms the other concave part of the "I"-shaped silicon steel sheet. Each time the second die punches once or multiple times, the second feeding table is controlled by a servo control system to accurately move the second feeding table and the silicon steel strip a preset distance in the Y direction;

[0121] S4. During the transfer of the silicon steel strip in the X direction, the third die continuously cuts the silicon steel strip along the transverse direction of the silicon steel strip according to a preset program to obtain multiple pairs of "I"-shaped silicon steel sheet groups (as shown in Figure 12 ).

[0122] Refer to Figure 13 . Preferably, in step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip, and positioning holes 80 are processed at the preset interval by using the punching die; in step S3, it further includes the step of using positioning pins to extend into the positioning holes 80 to position the silicon steel strip; in step S4, it further includes the step of using positioning pins to extend into the positioning holes 80 to position the silicon steel strip.

[0123] More preferably, in step S2, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip; in step S3, the length of the second die 40 punching in the longitudinal direction of the silicon steel strip is greater than the preset length of the "I"-shaped silicon steel sheet (i.e., over-punching, as shown in Figure 14 ).

[0124] The difference between this embodiment and Embodiment 1 is that the first die of the punching equipment includes n sets of dies, where n is an integer greater than 2, and the second die includes n - 1 sets of dies arranged side by side. Thus, in the punching process, the width of the silicon steel strip to be processed can be increased, so that multiple pairs of "I"-shaped silicon steel sheets can be obtained in the width of the silicon steel strip, while the equipment and process of Embodiment 1 can only obtain one pair of "I"-shaped silicon steel sheets in the width of the silicon steel strip, improving the processing efficiency.

[0125] Similarly, the first die of the above Embodiment 2, Embodiment 3, and Embodiment 4 can also be set to include n sets of dies, where n is an integer greater than 2, and the second die includes n - 1 sets of dies arranged side by side. Their punching processes are similar and will not be elaborated.

[0126] In the embodiments of the present invention, the cavities between the trapezoidal (stepped) stator cores are the same (equivalent to the parallel slots of the conventional motor core), and the widths of the individual silicon steel sheets are arranged substantially in an arithmetic progression. In the embodiments of the present invention, a first die including n sets of die sets (n is an even number greater than or equal to 2) arranged side by side is set in a punching and shearing device to punch and shear a silicon steel strip to obtain the concave contour on one side of the "I"-shaped silicon steel sheet. A second die is set to punch and shear the silicon steel strip to obtain the concave contour on the other side of the "I"-shaped silicon steel sheet. Moreover, the second die and the silicon steel strip can produce relative continuous displacement. A third die is set to cut off the silicon steel strip. By punching and shearing the silicon steel strip with three sets of dies, multiple pairs of silicon steel sheet groups with a preset width can be obtained. In the preferred solution of the embodiments of the present invention, the silicon steel strip is accurately positioned through positioning holes and positioning pins, and then the second die and the third die work, which can avoid the deviation of the position of the silicon steel strip during punching and shearing, thereby avoiding the defects that the sizes of the "I"-shaped silicon steel sheets punched out are inconsistent and the shape of the stator core formed by stacking and molding is poor. In a further preferred solution, by making the length of the punching and shearing of the second die in the longitudinal direction (X direction) of the silicon steel strip greater than the preset length of the "I"-shaped silicon steel sheet (i.e., over-punching), even if there is a slight deviation in the positioning of the silicon steel strip when the third die cuts it off transversely, no spikes will be formed on the silicon steel sheet, thereby avoiding the defects that the spikes damage the die and accelerate the wear rate of the die, and also avoiding the distortion and deformation of the silicon steel sheet during processing.

[0127] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A punching process for silicon steel sheets, which is used for punching "I"-shaped silicon steel sheets, is characterized in that The sequence includes the following steps: S1. Provide a silicon steel strip to be processed; S2. Use a first die to punch and shear the silicon steel strip to form a first groove with a preset shape on the silicon steel strip, thereby forming a first side portion of an "I"-shaped silicon steel sheet. One side concave portion of the "I"-shaped silicon steel sheet is formed at the first groove. Wherein, a preset interval with a certain distance is reserved between the preset "I"-shaped silicon steel sheets of the silicon steel strip, and positioning holes are processed at the preset interval by using a punching die; S3. Use a positioning pin to extend into the positioning hole to position the silicon steel strip, and use a second die to punch and shear the silicon steel strip to form a second groove with a preset shape on the silicon steel strip, thereby forming a second side portion of the "I"-shaped silicon steel sheet. The length of the second die punching and shearing in the longitudinal direction of the silicon steel strip is greater than the preset length of the "I"-shaped silicon steel sheet. The punching and shearing trajectory of the second die in the longitudinal direction of the silicon steel strip enters the area of the preset interval, The second groove corresponds to the first groove, and the other side concave portion of the "I"-shaped silicon steel sheet is formed at the second groove. After the second die punches and shears once or multiple times, a relative displacement with a preset distance is generated between the second die and the silicon steel strip in the transverse direction of the silicon steel strip to adjust the width of the "I"-shaped silicon steel sheet; S4. Use a positioning pin to extend into the positioning hole to position the silicon steel strip, and use a third die to cut the silicon steel strip along the transverse direction of the silicon steel strip to obtain "I"-shaped silicon steel sheets with different widths. The "I"-shaped silicon steel sheets with different widths can be stacked to form a stator core with a stepped profile.

2. The punching and shearing process according to claim 1, characterized in that, The first die includes n sets of dies arranged side by side, where n is an integer greater than or equal to 2.

3. The punching process according to claim 2, characterized in that, The second die includes n - 1 sets of dies arranged side by side.

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