New energy automobile motor iron core high-speed blanking forming precision control method

Abstract

The invention discloses a new energy automobile motor iron core high-speed blanking forming precision control method. The control method comprises the following steps that S1, a three-dimensional multi-station iron core progressive die is constructed, wherein the three-dimensional multi-station iron core progressive die comprises the four parts of layout drawing design, die frame guiding, feeding and misfeeding detection and plate pulling and stacking locking; and S2, die blanking, wherein a guide hole forming station, a buckling point forming station, a groove-shaped forming station and a blanking station which are sequentially arranged in the strip advancing direction are included in the forming process. According to the invention, by regulating and controlling the blanking forming process and optimizing the die design, the stability and precision of the motor iron core forming process are improved, edge errors and deformation defects caused by factors such as blanking speed, blank holder force and the like are effectively reduced, and higher production efficiency and product consistency are realized; meanwhile, the technical scheme of the invention has relatively high adaptability, can be widely applied to production of different types of automobile motor iron cores, and provides powerful support for motor manufacturing in the new energy automobile industry.

Description

Technical Field

[0001] The invention belongs to the technical field of high-speed progressive blanking and forming control for thin plates, and specifically relates to a method for controlling the high-speed blanking and forming accuracy of an iron core of a new energy vehicle motor. Background Art

[0002] The efficiency of new energy vehicle motors directly affects the performance and range of the vehicle. To study and optimize the motor structure design to improve the motor efficiency, it is necessary to focus on solving the problem of effectively reducing the internal eddy current of the motor caused by the high current operation when the motor is driven at high speed. The use of ultra-thin motor loose sheet stacking motor core forming has a significant effect on reducing the reactive power loss of the motor. However, the use of ultra-thin sheet metal punching motor loose sheets also has a great impact on the production efficiency of the enterprise. Under the same size of motor, a larger number of iron core loose sheets need to be formed by high-precision stacking and riveting. High-speed punching must be used to ensure production efficiency. At the same time, the high-speed progressive punching process of the iron core loose sheets and the complicated process are solved. The problem of controlling the forming accuracy of the loose sheets and their buckle points, such as edge errors and deformation defects caused by high-speed punching, etc., therefore, it is necessary to improve the product production efficiency under the premise of ensuring the forming accuracy of the ultra-thin loose sheet motor core.

[0003] In the prior art, multi-station high-speed progressive dies are often used to realize the integrated process of core punching and riveting. This method improves the production rate and qualification rate of new energy vehicle motor cores. However, as the punching speed increases, the fluctuation of precision errors becomes significant. It is difficult for the processing technology and mold device to ensure the accuracy of the feeding position. The material belt cannot accurately reach the processing station, resulting in misalignment, offset and repeated punching. At the same time, under high-speed conditions, the dimensional accuracy errors caused by problems such as the punching process, redundant processes and temperature rise effects can easily cause the actual height of the core block to deviate from the theoretical height after the cumulative effect. At present, the increase in processes and changes in processing conditions have increased the difficulty of controlling product precision and reduced the molding quality of the product. Summary of the invention

[0004] In order to solve the problems of edge error, deformation defects that are difficult to control, and reduced precision in the existing technology for the forming process of new energy vehicle motor cores, the present invention provides a method for controlling the high-speed blanking forming precision of new energy vehicle motor cores. The present invention improves the stability and precision of the motor core forming process by regulating the blanking forming process and optimizing the mold design, effectively reducing edge errors and deformation defects caused by factors such as blanking speed and clamping force, and achieving higher production efficiency and product consistency. At the same time, the technical solution of the present invention has strong adaptability and can be widely used in the production of different types of automobile motor cores, providing strong support for motor manufacturing in the new energy vehicle industry.

[0005] The technical solution adopted by the present invention is:

[0006] A method for controlling the high-speed blanking forming accuracy of a new energy vehicle motor core, characterized in that the control method comprises the following steps:

[0007] S1. Construct a three-dimensional multi-station iron core progressive die:

[0008] It includes four parts: design of layout drawing, mold frame and its guide, feeding and misfeeding detection, plate extraction and stacking locking;

[0009] S2. Die punching.

[0010] Furthermore, in step S2, the specific process of die punching includes:

[0011] S21, the coiled silicon steel sheet is conveyed step by step to the first shaft hole station, and the shaft hole and the ring side guide hole are punched through the first shaft hole station. The convex and concave dies for forming the guide hole are distributed at the first forming station along the boundary of the material strip at intervals of 5-8mm. A plurality of guide pins are arranged in an array along the same position in the subsequent forward direction of the material strip. The correct position of the workpiece in the mold is ensured by the matching accuracy between the guide hole and the guide pin, so as to avoid processing errors caused by position deviation;

[0012] S22, the coiled silicon steel sheet processed in step S21 is conveyed to the counting hole station in a stepwise manner. The counting hole station can selectively operate the punch of the forming buckle point by installing a draw plate mechanism. The draw plate mechanism is an important device for realizing the counting and separation of the core stacking height, and includes a cylinder solenoid valve, a pad, a draw plate and a sliding plate. The cylinder solenoid valve is installed on one side of the pad, and the draw plate is provided on the other side of the pad, and the other end of the draw plate is connected to the sliding plate;

[0013] By setting the required number of sheets on the control box, each stroke signal of the punch press is input into the control box. When the set number of sheets is punched, the control box sends a signal to activate the plate extraction mechanism through the solenoid valve and the cylinder, so that the counting punch can achieve the effect of counting separation, that is, the metering hole is punched through and the metering hole is not punched at the overlapping riveting point of the punching sheet;

[0014] S23, the coiled silicon steel sheet processed in step S22 is conveyed stepwise to a slot forming station, and a plurality of slot bodies uniformly distributed in the circumferential direction are punched out by the slot forming station;

[0015] S24, the coiled silicon steel sheet processed in step S23 is conveyed step by step to the second shaft hole station, and the shaft hole is corrected by the second shaft hole station to eliminate the assembly problem caused by the hole shape deviation in the high-speed punching process, and solve the problem of the product's precision reduction under high-speed working conditions;

[0016] S25, the coiled silicon steel sheet processed in step S24 is conveyed step by step to a buckle point forming station, and a plurality of strip-shaped trapezoidal buckle points are punched out by the buckle point forming station;

[0017] S26, the coiled silicon steel sheet processed in step S25 is conveyed to the blanking station step by step, and the silicon steel sheet is punched into a fan-shaped sheet iron core sheet by the blanking station and the stacking riveting process is completed with the previous sheet iron core, and the latter sheet iron core is rotated by a preset angle relative to the previous sheet iron core;

[0018] S27, repeating steps S21, S23, S25, and S26 N times, stacking and riveting N core pieces into a core block;

[0019] S28. The iron core block after riveting is dropped from the bottom of the blanking die to the conveyor belt for transportation.

[0020] Further, in step S25, the buckle point forming station includes a plurality of sets of matching buckle point convex molds and buckle point concave molds; the buckle point convex molds and buckle point concave molds are respectively cylindrical, and the central axis of the buckle point convex mold is horizontally offset by a preset distance relative to the central axis of the corresponding buckle point concave mold, and the punching depth of the buckle point convex mold does not exceed the thickness of the raw material;

[0021] A number of pressure rods corresponding to the buckling points are vertically inserted into the blanking punch. When the iron core punching sheet of the new energy vehicle motor is blanked, the lower end of the pressure rod is embedded in the buckling point and abuts against the iron core punching sheet; a number of ejector rods corresponding to the buckling points are inserted into the buckling point die. The buckling point punch, the buckling point die and the ejector rods form a strip-shaped trapezoidal buckle point forming cavity.

[0022] Furthermore, the rotation in step S26 is completed by a rotating device, which includes a tightening ring, a cylinder, a head tray, a synchronous belt, and a servo motor. The tightening ring has an interference fit with the blanking die, is nested in the concave fixing plate and is installed coaxially with the blanking die. The cylinder and the head tray are installed in combination on the coaxial position of the blanking die and are placed below the iron core blocks to be stacked. The cylinder provides an upward, continuous and constant lifting force; the synchronous belt connects the driven wheel at the lower end of the blanking die and the driving wheel of the servo motor. According to the required rotation angle and the corresponding transmission ratio, the servo motor drives the blanking die to rotate, and cooperates with the downward stroke movement of the punch press to realize the rotation and stacking process of the iron core at a preset angle.

[0023] Furthermore, a wear compensation device is provided on the tightening ring, and the wear compensation device includes an annular cavity arranged inside the tightening ring, and an extrusion expansion component is arranged in the annular cavity, and the extrusion expansion component is a back pressure spring assembly; wherein, a thin wall is formed between the cavity wall of the annular cavity and the inner hole wall of the tightening ring, which causes the inner hole of the tightening ring to shrink when the pressure bolt is pressed, and wear compensation is achieved by adjusting the pressure bolt.

[0024] Furthermore, the extrusion expansion device adopts a back pressure spring assembly formed by overlapping butterfly spring coils. Under the top pressure of the top pressure bolt, the butterfly spring coils are radially deformed, so that the inner hole of the butterfly spring produces a radial extrusion effect on the thin wall of the inner hole of the tightening ring, thereby reducing the inner hole of the tightening ring and playing a wear compensation role.

[0025] Furthermore, before step S21, a coiled silicon steel sheet with a thickness of 0.35 mm to 0.5 mm is selected and step-conveyed to the guiding station, wherein a guiding hole is punched on the coiled silicon steel sheet, and the first axis hole station, the counting hole station, the groove forming station, the buckle point station, and the blanking station are respectively provided with a guiding pin embedded in the guiding hole, and the guiding pin has a cylindrical structure. The guiding pin enters the guiding hole before the blanking punch, so that the relative position of the guiding hole and the guiding pin shape are aligned, thereby eliminating the error of the feeding step and ensuring that each component maintains a fixed relative position.

[0026] Furthermore, in step S1, the specific process of constructing a three-dimensional multi-station iron core progressive die includes:

[0027] S11. Sample layout design:

[0028] According to the stamping part drawing, the unfolded size is calculated, the stamping direction, deformation times and mold processing properties of the part are determined, and a layout scheme is designed after comprehensive analysis and judgment. The steps include material selection and size determination, reasonable arrangement of part shapes, blanking process sequence, and residual material optimization. Layout reduces downtime and equipment idling by reducing the adjustment of the position of the mold and workpiece during the blanking process. The corresponding material utilization rate and pressure center are calculated through UG / PDW.

[0029] S12, mold frame and its guide:

[0030] The die frame adopts a double-guide structure, and the upper and lower die base bodies are guided by 4 sets of large ball guide pillars to ensure stable spring pressure and achieve high-precision blanking processing;

[0031] S13, feeding and mis-delivery detection:

[0032] The material is fed through the feeding device, which includes an external coiling machine device, a guide plate device, and a blowing feeding auxiliary device. The coiling machine device is arranged outside the feed port of the punch press, and the coiled silicon steel sheet is fed to the feed port end at a set constant speed by a stepping motor to provide power for smooth feeding; the guide plate device is composed of blocks of different lengths, which are distributed on the peripheral side along the direction of the material belt. The installation position needs to avoid interference with other modules, and an equal number of spring floating pins are installed below to control the left and right swing of the strip material when it is fed forward. At the same time, the step distance of the material belt can also be controlled to prevent the sheet material from offset, sliding and deformation; the blowing feeding auxiliary device opens a channel on the concave template and slots under the guide plate, and constant high-pressure air enters the opened channel through the slot, forming a section of stable air pressure below the material to ensure that the material is not adhered to the stamping lubricant and take away the residual material chips in the mold;

[0033] S14, draw plate and stack lock:

[0034] An automatic stack counting and separation device is arranged on the mold structure, and a plate drawing mechanism is arranged on the counting punch. The plate drawing mechanism is driven by a cylinder, and the cylinder movement is controlled by a solenoid valve, and the solenoid valve is moved according to the instruction issued by the control box.

[0035] Furthermore, it also includes cooling the punch and the surrounding mold structure through a cooling circulation pipeline, the cooling circulation pipeline includes a mold oil outlet pipe, a storage box, a pump, a first filter, a second filter and an oil inlet pipe that are circulated and connected in sequence, the inlet and outlet arranged in the mold cavity are respectively connected to the oil inlet pipe and the oil outlet pipe, the first filter is provided with a filter bag to intercept particles in the cooling lubricant; the second filter is provided with a magnetic device to absorb iron filings in the lubricant; the mold is provided with a forming station, the forming station includes a guide hole forming station A, a groove forming station C, a buckle point forming station E and a blanking station F arranged in sequence in the direction of strip travel, each station is provided with a branch pipe, and a reflux groove is arranged around the outer periphery, the cooling lubricant can flow to the reflux groove after the oil overflows, so as to reduce the temperature changes caused by high strokes and affect the forming accuracy.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. The present invention uses an external coil leveling device to flatten coil silicon steel sheets of different materials and widths and feed them into a mold punch, and performs punching processing according to the designed pattern arrangement, overlap value and buckle point shape. A cooling reflux pipe device is provided to reduce the temperature rise caused by high punching times and multiple frequencies. In order to balance the accumulated material flatness error, the iron core is rotated and stacked, and finally an iron core block within the allowable range of precision error is formed, thereby realizing the control and precision improvement of the punching and forming of the iron core of the new energy vehicle motor.

[0038] 2. In the lamination forming process of the present invention, a wear compensation device is provided on the tightening ring. After the inner hole of the tightening ring is worn, the extrusion force of the top pressure bolt on the extrusion expansion device can be adjusted to make the inner hole of the tightening ring shrink to a certain extent, thereby realizing the wear compensation of the inner hole of the tightening ring.

[0039] 3. The present invention improves the forming accuracy and lamination efficiency of the motor core, can be applied to large-scale production lines, and has the advantages of fast punching efficiency, high feeding accuracy, and accurate guiding rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the arrangement scheme of the present invention;

[0041] Figure 2 This is a schematic diagram of the silicon steel sheet material jamming phenomenon of the present invention;

[0042] Figure 3 It is a schematic diagram of the air blowing and feeding auxiliary device of the present invention;

[0043] Figure 4a The overlapping rivet point pattern of the present invention is shown in FIG. Figure 1 ;

[0044] Figure 4b The overlapping rivet point pattern of the present invention is shown in FIG. Figure 2 ;

[0045] Figure 4c The overlapping rivet point pattern of the present invention is shown in FIG. Figure 3 ;

[0046] Figure 5 It is a flow chart of the blanking and forming station of the present invention;

[0047] Figure 6 It is a schematic diagram of a strip-shaped trapezoidal buckle point of the present invention;

[0048] Figure 7 It is a schematic diagram of the structure of the draw plate mechanism of the present invention;

[0049] Figure 8 It is a schematic diagram of the structure of the rotating device of the present invention;

[0050] Fig. 9 It is a schematic diagram of the tightening ring and the push rod structure of the present invention;

[0051] Fig.10 This is a schematic diagram of the cooling circulation pipeline structure of the present invention. DETAILED DESCRIPTION

[0052] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0054] The present invention will be described in detail below in conjunction with exemplary embodiments with reference to the accompanying drawings.

[0055] refer to Figures 1 to 10 The present invention provides a method for controlling the high-speed blanking forming accuracy of a new energy vehicle motor core, the control method comprising the following steps:

[0056] S1. Construct a three-dimensional multi-station iron core progressive die:

[0057] It includes four parts: design of layout drawing, mold frame and its guide, feeding and misfeeding detection, plate extraction and stacking locking;

[0058] In one embodiment, in step S1, the specific process of constructing a three-dimensional multi-station iron core progressive die includes:

[0059] S11. Sample layout design:

[0060] According to the stamping part drawing, the unfolded size is calculated, the stamping direction, deformation times and mold processing properties of the part are determined, and a layout scheme is designed after comprehensive analysis and judgment. The steps include material selection and size determination, reasonable arrangement of part shapes, blanking process sequence, and residual material optimization. Layout reduces downtime and equipment idling by reducing the adjustment of the position of the mold and workpiece during the blanking process. The corresponding material utilization rate and pressure center are calculated through UG / PDW.

[0061] S12, mold frame and its guide:

[0062] The die frame adopts a double-guide structure, and the upper and lower die base bodies are guided by 4 sets of large ball guide pillars to ensure stable spring pressure and achieve high-precision blanking processing;

[0063] S13, feeding and mis-delivery detection:

[0064] The material is fed through the feeding device, which includes an external coiling machine device, a guide plate device, and a blowing feeding auxiliary device. The coiling machine device is arranged outside the feed port of the punch press, and the coiled silicon steel sheet is fed to the feed port end at a set constant speed by a stepping motor to provide power for smooth feeding; the guide plate device is composed of blocks of different lengths, which are distributed on the peripheral side along the direction of the material belt. The installation position needs to avoid interference with other modules, and an equal number of spring floating pins are installed below to control the left and right swing of the strip material when it is fed forward. At the same time, the step distance of the material belt can also be controlled to prevent the sheet material from offset, sliding and deformation; the blowing feeding auxiliary device opens a channel on the concave template and slots under the guide plate, and constant high-pressure air enters the opened channel through the slot, forming a section of stable air pressure below the material to ensure that the material is not adhered to the stamping lubricant and take away the residual material chips in the mold;

[0065] S14, draw plate and stack lock:

[0066] An automatic lamination counting and separation device is arranged on the mold structure, and a plate drawing mechanism is arranged on the counting punch. The plate drawing mechanism is driven by a cylinder 11, and the movement of the cylinder 11 is controlled by a solenoid valve 11, and the solenoid valve 11 moves according to the instruction issued by the control box;

[0067] S2. Die punching.

[0068] The specific process of die punching includes:

[0069] S21, the coiled silicon steel sheet is conveyed step by step to the first shaft hole station, and the shaft hole and the ring side guide hole are punched through the first shaft hole station. The convex and concave dies for forming the guide hole are distributed at the first forming station along the boundary of the material strip at intervals of 5-8mm. A plurality of guide pins are arranged in an array along the same position in the subsequent forward direction of the material strip. The correct position of the workpiece in the mold is ensured by the matching accuracy between the guide hole and the guide pin, so as to avoid processing errors caused by position deviation;

[0070] Specifically, before step S21, a coiled silicon steel sheet with a thickness of 0.35 mm to 0.5 mm is selected and conveyed stepwise to the guiding station A, wherein a guiding hole is punched on the coiled silicon steel sheet, and the first shaft hole station, the counting hole station B, the groove forming station C, the buckle point station E, and the blanking station F are respectively provided with a guiding pin embedded in the guiding hole, and the guiding pin is of a cylindrical structure. The guiding pin enters the guiding hole before the blanking punch, so that the relative position of the guiding hole and the guiding pin shape are aligned, the feeding step error is eliminated, and the relative position of each component is ensured to be fixed;

[0071] S22, the coiled silicon steel sheet processed in step S21 is conveyed stepwise to the counting hole station B, and the counting hole station B can selectively operate the punch of the forming buckle point by installing a draw plate mechanism, and the draw plate mechanism is an important device for realizing the counting and separation of the iron core stack, and includes a cylinder solenoid valve 11, a pad 12, a draw plate 13 and a sliding plate 14, the cylinder solenoid valve 11 is installed on one side of the pad 12, and the draw plate 13 is provided on the other side of the pad 12, and the other end of the draw plate 13 is connected to the sliding plate 14;

[0072] By setting the required number of sheets on the control box, each stroke signal of the punch press is input into the control box. When the set number of sheets is punched, the control box sends a signal to activate the plate extraction mechanism through the solenoid valve and the cylinder, so that the counting punch can achieve the effect of counting separation, that is, the metering hole is punched through and the metering hole is not punched at the overlapping riveting point of the punching sheet;

[0073] S23, the coiled silicon steel sheet processed in step S22 is conveyed stepwise to the groove forming station C, and a plurality of groove bodies uniformly distributed in the circumferential direction are punched out by the groove forming station;

[0074] S24, the coiled silicon steel sheet processed in step S23 is conveyed step by step to the second shaft hole station D, and the shaft hole is corrected by the second shaft hole station D to eliminate the assembly problem caused by the hole shape deviation in the high-speed punching process, and solve the problem of the product's precision reduction under high-speed working conditions;

[0075] S25, the coiled silicon steel sheet processed in step S24 is conveyed step by step to the buckle point forming station E, and a plurality of strip-shaped trapezoidal buckle points 1 are punched out by the buckle point forming station;

[0076] Specifically, in step S25, the buckle point forming station includes a plurality of sets of matching buckle point convex molds and buckle point concave molds; the buckle point convex molds and buckle point concave molds are cylindrical, and the central axis of the buckle point convex mold is horizontally offset by a preset distance relative to the central axis of the corresponding buckle point concave mold, and the punching depth of the buckle point convex mold does not exceed the thickness of the raw material;

[0077] A number of pressure rods corresponding to the buckling points are vertically inserted into the blanking punch. When the iron core punching sheet of the new energy vehicle motor is blanked, the lower end of the pressure rod is embedded in the buckling point and abuts against the iron core punching sheet; a number of ejector rods corresponding to the buckling points are inserted into the buckling point die. The buckle point punch, the buckle point die and the ejector rods enclose a strip-shaped trapezoidal buckle point 1 forming cavity.

[0078] S26. The coiled silicon steel sheet processed in step S25 is conveyed step by step to the blanking station F, where the silicon steel sheet is punched into fan-shaped iron core sheets and the stacking and riveting process is completed with the previous iron core punch sheet, and the latter iron core sheet is rotated by a preset angle relative to the previous iron core sheet.

[0079] Specifically, the rotation in step S26 is completed by a rotating device, which includes a tightening ring 311, a cylinder, a head tray 312, a synchronous belt 214, and a servo motor 215; the tightening ring 311 has an interference fit with the blanking die, is nested in the concave fixing plate and is installed coaxially with the blanking die; the cylinder and the head tray 312 are installed in combination at the coaxial position of the blanking die and are placed below the iron core block 313 to be stacked, and the cylinder provides an upward, continuous and constant lifting force; the synchronous belt 214 connects the driven wheel 217 at the lower end of the blanking die and the driving wheel of the servo motor 215, and according to the required rotation angle and the corresponding transmission ratio, the servo motor 215 drives the blanking die to rotate, and cooperates with the downward stroke movement of the punch press to realize the iron core performing the rotation stacking process at a preset angle.

[0080] Specifically, a wear compensation device 21 is provided on the tightening ring, and the wear compensation device 21 includes an annular cavity arranged inside the tightening ring, and an extrusion expansion component 211 is provided in the annular cavity, and the extrusion expansion component 211 is a back pressure spring assembly; wherein, a thin wall is formed between the cavity wall of the annular cavity and the inner hole wall of the tightening ring, which shrinks the inner hole of the tightening ring when pressed by a pressing bolt 212, and wear compensation is achieved by adjusting the pressing bolt 212.

[0081] Specifically, a pressure bolt 212 is provided on the lower end surface of the tightening ring 311, and the front end push rod 213 of the pressure bolt 212 extends into the internal cavity of the tightening ring. The pressure bolt 212 includes a threaded section and a cylindrical section as the front end push rod 213; the tightening ring can achieve the wear compensation function by tightening the pressure bolt 212; the servo motor 215 is a component included in the tightening ring device, and the transmission key 216 is a mechanism connecting the driven wheel 217 and the tightening ring 311, and the rotation of the driven wheel drives the tightening ring to rotate, thereby realizing the rotation function.

[0082] Specifically, the extrusion expansion device 211 adopts a back pressure spring assembly formed by overlapping butterfly spring coils. Under the top pressure of the top pressure bolt 212, the butterfly spring coils are radially deformed, so that the inner hole of the butterfly spring produces a radial extrusion effect on the thin wall of the inner hole of the tightening ring, thereby reducing the inner hole of the tightening ring and playing a wear compensation role.

[0083] S27, repeating steps S21, S23, S25, and S26 N times, stacking and riveting N core pieces into a core block 313;

[0084] S28, the core block 313 after riveting is dropped from the bottom of the blanking die to the conveyor belt for transportation.

[0085] In one embodiment, the punch and the surrounding mold structure are cooled by a cooling circulation pipeline, wherein the cooling circulation pipeline comprises a mold oil outlet pipe 415, a pump 414, a first filter 413, a second filter 412 and an oil inlet pipe 411 which are circulated and connected in sequence, and the inlet and outlet arranged in the mold cavity are respectively connected to the oil inlet pipe and the oil outlet pipe, and a filter bag is arranged on the first filter to intercept particles in the cooling lubricant; the second filter is provided with a magnetic device to absorb iron filings in the lubricant; a forming station 417 is arranged on the mold, and the forming station 417 comprises a guide hole forming station A, a groove forming station C, a buckle point forming station E and a blanking station F which are arranged in sequence in the direction of the strip material travel, each station is provided with a branch pipe, and a reflux groove 416 is arranged around the periphery, and the cooling lubricant can flow to the reflux groove after the oil overflows, so as to reduce the temperature change caused by high strokes and affect the forming accuracy.

[0086] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for controlling the high-speed blanking forming accuracy of a new energy vehicle motor core, characterized in that: The control method comprises the following steps: S1. Construct a three-dimensional multi-station iron core progressive die: It includes four parts: design of layout drawing, mold frame and its guide, feeding and misfeeding detection, plate extraction and stacking locking; S2. Die punching.

2. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 1, characterized in that: In step S2, the specific process of die punching includes: S21, the coiled silicon steel sheet is conveyed step by step to the first shaft hole station, and the shaft hole and the ring side guide hole are punched through the first shaft hole station. The convex and concave dies for forming the guide hole are distributed at the first forming station along the boundary of the material strip at intervals of 5-8mm. A plurality of guide pins are arranged in an array along the same position in the subsequent forward direction of the material strip. The correct position of the workpiece in the mold is ensured by the matching accuracy between the guide hole and the guide pin, so as to avoid processing errors caused by position deviation; S22, the coiled silicon steel sheet processed in step S21 is conveyed to the counting hole station in a stepwise manner. The counting hole station can selectively operate the punch of the forming buckle point by installing a draw plate mechanism. The draw plate mechanism is an important device for realizing the counting and separation of the core stacking height, and includes a cylinder solenoid valve, a pad, a draw plate and a sliding plate. The cylinder solenoid valve is installed on one side of the pad, and the draw plate is provided on the other side of the pad, and the other end of the draw plate is connected to the sliding plate; By setting the required number of sheets on the control box, each stroke signal of the punch press is input into the control box. When the set number of sheets is punched, the control box sends a signal to activate the plate extraction mechanism through the solenoid valve and the cylinder, so that the counting punch can achieve the effect of counting separation, that is, the metering hole is punched through and the metering hole is not punched at the overlapping riveting point of the punching sheet; S23, the coiled silicon steel sheet processed in step S22 is conveyed stepwise to a slot forming station, and a plurality of slot bodies uniformly distributed in the circumferential direction are punched out by the slot forming station; S24, the coiled silicon steel sheet processed in step S23 is conveyed step by step to the second shaft hole station, and the shaft hole is corrected by the second shaft hole station to eliminate the assembly problem caused by the hole shape deviation in the high-speed punching process, and solve the problem of the product's precision reduction under high-speed working conditions; S25, the coiled silicon steel sheet processed in step S24 is conveyed step by step to a buckle point forming station, and a plurality of strip-shaped trapezoidal buckle points are punched out by the buckle point forming station; S26, the coiled silicon steel sheet processed in step S25 is conveyed to the blanking station step by step, and the silicon steel sheet is punched into a fan-shaped sheet iron core sheet by the blanking station and the stacking riveting process is completed with the previous sheet iron core, and the latter sheet iron core is rotated by a preset angle relative to the previous sheet iron core; S27, repeating steps S21, S23, S25, and S26 N times, stacking and riveting N core pieces into a core block; S28. The iron core block after riveting is dropped from the bottom of the blanking die to the conveyor belt for transportation.

3. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 2, characterized in that: In the step S25, the buckle point forming station includes a plurality of sets of matching buckle point convex molds and buckle point concave molds; the buckle point convex molds and buckle point concave molds are respectively cylindrical, and the central axis of the buckle point convex mold is horizontally offset by a preset distance relative to the central axis of the corresponding buckle point concave mold, and the punching depth of the buckle point convex mold does not exceed the thickness of the raw material; A number of pressure rods corresponding to the buckling points are vertically inserted into the blanking punch. When the iron core punching sheet of the new energy vehicle motor is blanked, the lower end of the pressure rod is embedded in the buckling point and abuts against the iron core punching sheet; a number of ejector rods corresponding to the buckling points are inserted into the buckling point die. The buckling point punch, the buckling point die and the ejector rods form a strip-shaped trapezoidal buckle point forming cavity.

4. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 2, characterized in that: The rotation in step S26 is completed by a rotating device, which includes a tightening ring, a cylinder, a head tray, a synchronous belt, and a servo motor. The tightening ring has an interference fit with the blanking die, is nested in the concave fixing plate and is installed coaxially with the blanking die. The cylinder and the head tray are installed in combination on the coaxial position of the blanking die and placed below the iron core blocks to be stacked. The cylinder provides an upward, continuous and constant lifting force; the synchronous belt connects the driven wheel at the lower end of the blanking die and the driving wheel of the servo motor. According to the required rotation angle and the corresponding transmission ratio, the servo motor drives the blanking die to rotate, and cooperates with the downward stroke movement of the punch press to realize the rotation and stacking process of the iron core at a preset angle.

5. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 4, characterized in that: A wear compensation device is arranged on the tightening ring, and the wear compensation device includes an annular cavity arranged inside the tightening ring, and an extrusion expansion component is arranged in the annular cavity, and the extrusion expansion component is a back pressure spring assembly; wherein, a thin wall is formed between the cavity wall of the annular cavity and the inner hole wall of the tightening ring, which causes the inner hole of the tightening ring to shrink when the pressing bolt is pressed, and wear compensation is achieved by adjusting the pressing bolt.

6. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 4, characterized in that: The extrusion expansion device adopts a back pressure spring assembly formed by overlapping butterfly spring coils. Under the top pressure of the top pressure bolt, the butterfly spring coils are radially deformed, so that the inner hole of the butterfly spring produces a radial extrusion effect on the thin wall of the inner hole of the tightening ring, thereby reducing the inner hole of the tightening ring and playing a wear compensation role.

7. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 2, characterized in that: Before step S21, a coiled silicon steel sheet with a thickness of 0.35mm to 0.5mm is selected and step-by-step conveyed to the guiding station, wherein a guiding hole is punched on the coiled silicon steel sheet, and the first axis hole station, the counting hole station, the groove forming station, the buckle point station, and the blanking station are respectively provided with a guiding pin embedded in the guiding hole, and the guiding pin is of a cylindrical structure. The guiding pin enters the guiding hole before the blanking punch, so that the relative position of the guiding hole and the guiding pin shape are aligned, thereby eliminating the error of the feeding step and ensuring that each component maintains a fixed relative position.

8. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 1, characterized in that: In step S1, the specific process of constructing a three-dimensional multi-station iron core progressive die includes: S11. Sample layout design: According to the stamping part drawing, the unfolded size is calculated, the stamping direction, deformation times and mold processing properties of the part are determined, and a layout scheme is designed after comprehensive analysis and judgment. The steps include material selection and size determination, reasonable arrangement of part shapes, blanking process sequence, and residual material optimization. Layout reduces downtime and equipment idling by reducing the adjustment of the position of the mold and workpiece during the blanking process. The corresponding material utilization rate and pressure center are calculated through UG / PDW. S12, mold frame and its guide: The die frame adopts a double-guide structure, and the upper and lower die base bodies are guided by 4 sets of large ball guide pillars to ensure stable spring pressure and achieve high-precision blanking processing; S13, feeding and mis-delivery detection: The material is fed through the feeding device, which includes an external coiling machine device, a guide plate device, and a blowing feeding auxiliary device. The coiling machine device is arranged outside the feed port of the punch press, and the coiled silicon steel sheet is fed to the feed port end at a set constant speed by a stepping motor to provide power for smooth feeding; the guide plate device is composed of blocks of different lengths, which are distributed on the peripheral side along the direction of the material belt. The installation position needs to avoid interference with other modules, and an equal number of spring floating pins are installed below to control the left and right swing of the strip material when it is fed forward. At the same time, the step distance of the material belt can also be controlled to prevent the sheet material from offset, sliding and deformation; the blowing feeding auxiliary device opens a channel on the concave template and slots under the guide plate, and constant high-pressure air enters the opened channel through the slot, forming a section of stable air pressure below the material to ensure that the material is not adhered to the stamping lubricant and take away the residual material chips in the mold; S14, draw plate and stack lock: An automatic stack counting and separation device is arranged on the mold structure, and a plate drawing mechanism is arranged on the counting punch. The plate drawing mechanism is driven by a cylinder, and the cylinder movement is controlled by a solenoid valve, and the solenoid valve is moved according to the instruction issued by the control box.

9. A method for controlling the high-speed blanking forming precision of a new energy vehicle motor core as claimed in claim 1, characterized in that: It also includes cooling the punch and the surrounding mold structure through a cooling circulation pipeline, the cooling circulation pipeline includes a mold oil outlet pipe, a storage box, a pump, a first filter, a second filter and an oil inlet pipe that are circulated and connected in sequence, the inlet and outlet arranged in the mold cavity are respectively connected to the oil inlet pipe and the oil outlet pipe, a filter bag is arranged on the first filter to intercept particles in the cooling lubricant; the second filter is provided with a magnetic device to absorb iron filings in the lubricating oil; the mold is provided with a forming station, the forming station includes a guide hole forming station A, a groove forming station C, a buckle point forming station E and a blanking station F arranged in sequence in the direction of the strip material, each station is provided with a branch pipe, and a reflux groove is arranged around the outer periphery, the cooling lubricant can flow to the reflux groove after the oil overflows, so as to reduce the temperature changes caused by high strokes and affect the forming accuracy.

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