A method for manufacturing a core strip with no overlap at the tail

Abstract

The present invention provides a method for manufacturing an iron core of a tail-end overlap-free strip, which is used for a double-row strip, wherein a concave fixing plate includes a lifting mechanism, which is arranged at a front-row stator buckle point punching position, a first rear-row stator buckle point punching position and a second rear-row stator buckle point punching position, and is used to lift the double-row strip after the overlap is cut off so as to separate it from the concave fixing plate, thereby avoiding a large friction force generated between the contact surface of the concave fixing plate and the double-row strip, thereby causing deformation of the double-row strip without overlap, so that the double-row strip after the overlap is cut off can be fed forward at a faster speed, thereby improving the stamping efficiency; the concave fixing plate also includes a side limiting mechanism, which is used to limit the double-row strip after the overlap is cut off from both sides, so as to prevent the double-row strip from shaking too much and causing the problem of inaccurate stamping position, so as to further improve the forward feeding speed of the double-row strip.

Description

Technical Field

[0001] The invention relates to the technical field of iron core manufacturing, and in particular to a method for manufacturing an iron core with a tail-end overlap-free strip. Background Art

[0002] In the field of iron core manufacturing, how to reduce the iron core manufacturing cost is the focus of manufacturers. Among them, the silicon steel sheet material cost and the stamping efficiency of the iron core account for a large proportion of the entire iron core manufacturing cost.

[0003] Using a strip without overlap at the tail or cutting the overlap into a strip without overlap is beneficial to improving material utilization. In order to further reduce costs, double-row strips are often used for staggered stamping, that is, the front-row strips and the rear-row strips arranged in parallel are staggered by half a station; however, in the absence of overlap, the rigidity of the double-row strips is reduced, and the friction between the tail of the strip and the contact surface of the concave fixing plate is large when feeding forward in steps, which makes the tail of the strip prone to deformation. In addition, due to the lack of overlapping limit, the jitter amplitude of the tail of the strip is large, and the problem of inaccurate stamping position is prone to occur; in order to ensure smooth production, the feeding speed can only be reduced, which greatly reduces the stamping efficiency of the iron core and increases the manufacturing cost. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a method for manufacturing an iron core with faster feeding speed, smaller jitter and more accurate punching position when using a double-row material strip with no overlap at the tail to punch out iron core pieces.

[0005] The technical solution adopted by the present invention to solve the above problem is: a method for manufacturing a core strip without a tail overlap, comprising the following steps:

[0006] Step A, loading: feeding the double-row material strip into the concave fixing plate and continuously conveying it in steps in the direction of blanking;

[0007] Step B, overlap processing: in the process of stepping forward feeding of the double-row material strip, the rotor sheets and stator sheets are punched out in the front row and the rear row of the material strip step by step;

[0008] Step C, cutting off the overlap: in the process of the double-row material strips being fed forward step by step, the overlaps of the front row and the rear row of the material strips are respectively cut off at the front row trimming station and the rear row trimming station;

[0009] Step D, punching stator buckle points: in the process of feeding the front row of the material strip from the front row trimming station to the front row stator buckle point punching position and feeding the rear row of the material strip from the rear row trimming station to the first rear row stator buckle point punching position, the side limiting mechanism limits the front row of the material strip and the rear row of the material strip from the outside, and the plurality of movable floating pins located at the front row stator buckle point punching position and the first rear row stator buckle point punching position respectively lift the front row of the material strip and the rear row of the material strip, and punch out the stator buckle points of the front row and the rear row of the material strip at the front row stator buckle point punching position and the first rear row stator buckle point punching position respectively;

[0010] Step E, first blanking of stator sheets: in the process of feeding the front row of the material strip from the front row stator buckle point punching position to the front row blanking station and feeding the rear row of the material strip from the first rear row stator buckle point punching position to the second rear row stator buckle point punching position, the fixed floating pins and the side lifting plates respectively lift the front row of the material strip from both sides, and punch out the stator sheets for the first time at the front row blanking station, and the multiple movable floating pins and the fixed floating pins lift the rear row of the material strip, and repeatedly punch the stator buckle points of the rear row of the material strip at the second rear row stator buckle point punching position;

[0011] Step F, second blanking of stator sheets: When the rear row of the material strip is fed forward from the second rear row stator buckle point punching position to the rear row blanking station, two side lifting plates lift the rear row of the material strip from both sides respectively, and punch out the stator sheets for the second time at the rear row blanking station.

[0012] Compared with the prior art, the double-row material strip of the present invention comprises a front row of material strips and a rear row of material strips which are staggered half a station in front and back, and a front row trimming station and a rear row trimming station are provided on the concave fixing plate, which are used to cut off the overlap of the front row of material strips and the rear row of material strips, so as to improve the material utilization rate; the concave fixing plate comprises a lifting mechanism composed of a movable floating pin, a fixed floating pin and a side lifting plate, and the lifting mechanism is arranged at the front row stator buckle point punching position, the first rear row stator buckle point punching position and the second rear row stator buckle point punching position, which is used to cut off the overlap after cutting off the overlap The double-row material strip is lifted to separate from the concave fixing plate to avoid large friction between the contact surface of the concave fixing plate and the double-row material strip, which may cause deformation of the double-row material strip without overlap, so that the double-row material strip after the overlap is cut off can be fed forward at a faster speed, thereby improving the stamping efficiency; the concave fixing plate also includes a side limiting mechanism for limiting the double-row material strip after the overlap is cut off from both sides to prevent the double-row material strip from shaking too much and causing inaccurate stamping position problems, so as to further improve the forward feeding speed of the double-row material strip.

[0013] The invention provides a method for manufacturing a core strip with no tail overlap, wherein in step C: the overlaps to be cut off include outer overlaps of stator sheets and inner overlaps of stator sheets.

[0014] The present invention provides a method for manufacturing an iron core with a tail-unlapped strip, in step D: the movable floating pins lift the front row and the rear row of the strip to a height h1 along the feeding direction, the upper dies of the front row stator buckle point punching positions and the first rear row stator buckle point punching positions are synchronously pressed down to punch out stator buckle points in the front row and the rear row of the strip.

[0015] In a method for manufacturing a core strip without a tail overlap of the present invention, the front blanking station includes a front blanking outer hole, and step E includes the following sub-steps:

[0016] Step e1: when the front row of the material strip is located at the front row stator buckle point punching position, the front row of the material strip is lifted to a height h1 by the movable floating pins;

[0017] Step e2: during the process of feeding the front row of the material strip from the front row stator buckle point punching position to the front row blanking station, the front row of the material strip is lifted by the fixed floating pins and the side lifting plates from the height h2 to the height h3;

[0018] Step e3: After the front row of the material strip is located at the front row blanking station, it naturally hangs down from the height h3 and is staggered with the fixed floating pins and the side lifting plates. The blanking upper die is pressed downward to punch out the stator sheets from the front row blanking outer holes.

[0019] In a method for manufacturing a core with a strip having no overlap at the tail of the present invention, in step e1, when the rear row of the strip is located at the first rear row stator buckle point punching position, the rear row of the strip is lifted to a height h1 by the movable floating pins;

[0020] In step e2, during the process of feeding the rear row of the material strip from the first rear row stator buckle point punching position to the second rear row stator buckle point punching position, the rear row of the material strip is lifted to a height h4 by the movable floating pins and the fixed floating pins;

[0021] In step e3, the upper die for punching the second rear stator buckle points is pressed downward to punch the stator buckle points of the rear row of the material strip again.

[0022] In a method for manufacturing a core strip without a tail overlap of the present invention, the rear row blanking station comprises a rear row blanking profile hole; step F comprises the following sub-steps:

[0023] Step f1: when the rear row of the material strip is located at the second rear row stator buckle point punching position, the rear row of the material strip is lifted to a height h4 by the movable floating pins and the fixed floating pins;

[0024] Step f2: during the process of feeding the rear row of the material strip from the second rear row stator buckle point punching position to the rear row blanking station, the rear row of the material strip is lifted to a height h5 by the two side lifting plates;

[0025] Step f3: After the rear row of the material strip is located at the rear row blanking station, it naturally hangs down from the height h5 and is staggered with the two side lifting plates. The blanking upper die is pressed downward to punch out the stator sheet from the rear row blanking outer shape hole.

[0026] The present invention provides a method for manufacturing an iron core with a tail-end overlap-free strip, wherein height h1<height h2<height h4≤height h3=height h5.

[0027] In a method for manufacturing an iron core with a tail-end overlapless strip of material of the present invention, in step e2, the two limiting mechanisms are staggered by half a station and are respectively arranged on the outside of the front row and the rear row of the strip of material.

[0028] In a method for manufacturing an iron core with a tail-end overlap-free strip of material of the present invention, in step f2, the limiting mechanism limits the position from both sides of the rear row of the strip of material. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the manufacturing method of the present invention;

[0030] Figure 2 It is a top view schematic diagram of the present invention;

[0031] Figure 3 A top view schematic diagram of the front row of the material strip;

[0032] Figure 4 This is an enlarged schematic diagram of the movable floating pins and fixed floating pins in area D;

[0033] Figure 5 It is a top view schematic diagram of the rear row of the material strip;

[0034] Figure 6 It is a cross-sectional schematic diagram of a movable floating pin and a fixed floating pin;

[0035] Figure 7 is a cross-sectional schematic diagram of a side lifting plate;

[0036] Figure 8 is a top view schematic diagram of the side lifting plate;

[0037] Fig. 9 This is a schematic diagram of the distribution of active floating pins in the four areas of A, B, C, and D;

[0038] Fig.10 A schematic cross-sectional view from one side of the rear row of the material belt feeding;

[0039] Fig.11 A side-view cross-sectional diagram of the front row of material belt feeding. DETAILED DESCRIPTION

[0040] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The present invention can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0041] Furthermore, on the first aspect, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0042] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0043] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0044] See also Figure 1-11 A method for manufacturing a core strip without a tail overlap is shown, comprising the following steps:

[0045] Step A, loading: feeding the double-row material strip 1 into the concave fixing plate 2, and continuously conveying it in steps in the direction of blanking;

[0046] Step B, overlap processing: in the process of feeding the double-row material strip 1 step by step forward, the rotor sheets and the stator sheets are punched out in the front row 11 and the rear row 12 of the material strip step by step;

[0047] Step C, cutting off the overlapping edges: in the process of the double-row material strip 1 being fed forward in steps, the overlapping edges of the front row 11 and the rear row 12 of the material strip are respectively cut off at the front row trimming station 21 and the rear row trimming station 24;

[0048] Step D, punching stator buckle points: in the process of feeding the front row 11 of the material strip from the front row trimming station 21 to the front row stator buckle point punching position 22 and feeding the rear row 12 of the material strip from the rear row trimming station 24 to the first rear row stator buckle point punching position 25, the side limiting mechanism 29 limits the front row 11 of the material strip and the rear row 12 of the material strip from the outside respectively, and the plurality of movable floating pins 281 located at the front row stator buckle point punching position 22 and the first rear row stator buckle point punching position 25 lift the front row 11 of the material strip and the rear row 12 of the material strip respectively, and punch out the stator buckle points of the front row 11 of the material strip and the rear row 12 of the material strip at the front row stator buckle point punching position 22 and the first rear row stator buckle point punching position 25 respectively;

[0049] Step E, first blanking of stator sheets: in the process of feeding the front row 11 of the material strip from the front row stator buckle point punching position 22 forward to the front row blanking station 23 and feeding the rear row 12 of the material strip from the first rear row stator buckle point punching position 25 forward to the second rear row stator buckle point punching position 26, the fixed floating pins 282 and the side lifting plates 283 respectively lift the front row 11 of the material strip from both sides, and punch out the stator sheets for the first time at the front row blanking station 23, and the multiple movable floating pins 281 and the fixed floating pins 282 lift the rear row 12 of the material strip, and repeatedly punch the stator buckle points of the rear row 12 of the material strip at the second rear row stator buckle point punching position 26;

[0050] Step F, second blanking of stator sheets: When the rear row 12 of the material strip is fed forward from the second rear row stator buckle punching station 26 to the rear row blanking station 27, the two side lifting plates 283 lift the rear row 12 of the material strip from both sides respectively, and punch out the stator sheets for the second time at the rear row blanking station 27.

[0051] The double-row material strip 1 corresponding to the present invention comprises a front row 11 and a rear row 12 of material strips which are staggered by half a station, and a front row trimming station 21 and a rear row trimming station 24 are provided on the concave fixing plate 2, which are used to cut off the overlapping edges of the front row 11 and the rear row 12 of the material strips, so as to improve the material utilization rate; the concave fixing plate 2 comprises a lifting mechanism 28 composed of a movable floating pin 281, a fixed floating pin 282 and a side lifting plate 283, and the lifting mechanism 28 is arranged at the front row stator buckle point punching position 22, the first rear row stator buckle point punching position 25 and the second rear row stator buckle point punching position 26, which are used to The double-row material strip 1 after the overlapping edge is cut off is lifted so as to be separated from the concave fixing plate 2, so as to avoid that the contact surface between the concave fixing plate 2 and the double-row material strip 1 generates a large friction force, which may cause the double-row material strip 1 without overlapping edge to deform, so that the double-row material strip 1 after the overlapping edge is cut off can be fed forward at a faster speed, thereby improving the stamping efficiency; the concave fixing plate 2 also includes a side limiting mechanism 29, which is used to limit the double-row material strip 1 after the overlapping edge is cut off from both sides, so as to prevent the double-row material strip 1 from shaking too much and causing the problem of inaccurate stamping position, so as to further improve the forward feeding speed of the double-row material strip 1.

[0052] Understandably, see Figure 1 In step B, the double-row material strip 1 has an overlap, and the double-row material strip 1 is fed forward in steps to perform the punching of the rotor sheet in steps. After the rotor sheet is blanked, the stator sheet is punched in steps, and finally the stator sheet is punched out in step B. At this time, the double-row material strip 1 is in an overlap state; after the stator sheet is punched out, the overlap removal process shown in step C can be performed, and then the stator shape is punched out by the overlap removal process; since the various steps of punching the rotor sheet and the stator sheet processing steps before punching the stator sheet are prior art, they are not repeated in the present invention.

[0053] It can be understood that in the present embodiment, the trimming station is followed by the stator buckle point punching station, and the stator buckle point punching station is followed by the blanking station. Depending on the actual iron chip shape and process arrangement, the stator buckle point punching station can also be replaced by other processing stations, such as the stator sheet punching station. When the actual blanking shapes of the stations are different, the lifting mechanism 28 can also play a lifting role, thereby improving the stamping efficiency. The side limit mechanism 29 can also play a limiting role to prevent the jitter amplitude from being too large.

[0054] It can be understood that, with regard to the present embodiment, the double-row material strip 1 includes a front row 11 and a rear row 12 of material strips which are staggered by half a station, while in other embodiments, according to the structure of the actual concave fixing plate 2 and the stamping upper mold, the material strips can also be arranged in three rows or more, and the two adjacent rows of material strips can be staggered by half a station.

[0055] Please continue reading Figure 1-11In step C: the overlap edges cut off include the outer overlap edges of the stator sheets and the inner overlap edges of the stator sheets. The outer edges of the stator sheets are punched out by cutting off the outer overlap edges of the stator sheets, and the inner edges of the stator sheets are punched out by cutting off the inner overlap edges of the stator sheets, and the stator sheets that are staggered by half a station are disengaged.

[0056] Please continue reading Figure 1-11 In step D: the movable floating pin 281 lifts the front row 11 and the rear row 12 of the material strip to a height h1 along the feeding direction, and the upper molds of the front row stator buckle point punching position 22 and the first rear row stator buckle point punching position 25 are pressed down synchronously and punch out stator buckle points in the front row 11 and the rear row 12 of the material strip.

[0057] Please continue reading Figure 1-11 The front blanking station 23 includes a front blanking outer hole 231, and step E includes the following sub-steps:

[0058] Step e1: When the front row 11 of the material strip is located at the front row stator buckle point punching position 22, the front row 11 of the material strip is lifted to a height h1 by the movable floating pin 281;

[0059] Step e2: During the process of feeding the front row 11 of the material strip from the front row stator buckle punching position 22 to the front row blanking station 23, the front row 11 of the material strip is lifted from the height h2 to the height h3 by the fixed floating pins 282 and the side lifting plates 283;

[0060] Step e3: After the front row 11 of the material strip is located at the front row blanking station 23, it naturally hangs down from the height h3 and is staggered with the fixed floating pins 282 and the side lifting plates 283. The blanking upper die is pressed down to punch out the stator sheet from the front row blanking outer shape hole 231.

[0061] Please continue reading Figure 1-11 In step e1, when the rear row 12 of the material strip is located at the first rear row stator buckle point punching position 25, the rear row 12 of the material strip is lifted to a height h1 by the movable floating pin 281;

[0062] In step e2, during the feeding of the rear row 12 of the material strip from the first rear row stator buckle point punching position 25 to the second rear row stator buckle point punching position 26, the rear row 12 of the material strip is lifted to a height h4 by the movable floating pins 281 and the fixed floating pins 282;

[0063] In step e3, the upper die of the second rear stator buckle point punching position 26 is pressed downward to punch the stator buckle points of the rear row 12 of the material strip again.

[0064] Please continue reading Figure 1-11 The rear blanking station 27 includes a rear blanking outer hole 271; step F includes the following sub-steps:

[0065] Step f1: when the rear row 12 of the material strip is located at the second rear row stator buckle point punching position 26, the rear row 12 of the material strip is lifted to a height h4 by the movable floating pins 281 and the fixed floating pins 282;

[0066] Step f2: During the process of feeding the rear row 12 of the material strip from the second rear row stator buckle punching station 26 to the rear row blanking station 27, the rear row 12 of the material strip is lifted to a height h5 by two side lifting plates 283;

[0067] Step f3: After the rear row 12 of the material strip is located at the rear row blanking station 27, it naturally hangs down from the height h5 and is staggered with the two side lifting plates 283. The blanking upper die is pressed down to punch out the stator sheet from the rear row blanking outer shape hole 271.

[0068] Please continue reading Figure 1-11 , height h1<height h2<height h4≤height h3=height h5.

[0069] Please continue reading Figure 1-11 In step e2, two limiting mechanisms 29 are staggered by half a station and are respectively arranged on the outside of the front row 11 and the rear row 12 of the material strip.

[0070] Please continue reading Figure 1-11 In step f2, the limiting mechanism 29 limits the rear row 12 of the material strip from both sides.

[0071] Please continue reading Figure 2-11 The present invention provides a method for manufacturing a core with no overlap at the tail of the material strip, which can be specifically implemented by a device for manufacturing a core with double rows of material strips without overlap at the tail. The device for manufacturing a core with double rows of material strips without overlap at the tail comprises a concave fixing plate 2, which comprises a front row trimming station 21, a front row stator buckle point punching station 22 and a front row blanking station 23 for processing a front row 11 of the material strip, a rear row trimming station 24, a first rear row stator buckle point punching station 25, a second rear row stator buckle point punching station 26 and a rear row blanking station 27 for processing a rear row 12 of the material strip. The rear row blanking station 27; the concave fixing plate 2 also includes a lifting mechanism 28 and a side limiting mechanism 29; the lifting mechanism 28 lifts the front row 11 of the material strip passing through the front row stator buckle point punch position 22, and lifts the rear row 12 of the material strip passing through the first rear row stator buckle point punch position 25 and the second rear row stator buckle point punch position 26; the side limiting mechanism 29 is arranged on the outer side of the front row stator buckle point punch position 22, and the outer side of the first rear row stator buckle point punch position 25 and the second rear row stator buckle point punch position 26.

[0072] Please continue reading Figure 2-5, wherein the material lifting mechanism 28 includes a movable floating pin 281, a fixed floating pin 282 and a side lifting plate 283; a plurality of movable floating pins 281 are arranged at the front stator buckle point punching position 22, the first rear stator buckle point punching position 25 and the second rear stator buckle point punching position 26; the fixed floating pin 282 is arranged at the intersection of the first rear stator buckle point punching position 25 and the front blanking station 23; one of the side lifting plates 283 is arranged on the outside of the front row 11 of the material strip, and is located between the front stator buckle point punching position 22 and the front blanking station 23; the other two side lifting plates 283 are respectively arranged on both sides of the rear row 12 of the material strip, and are located between the second rear stator buckle point punching position 26 and the rear blanking station 27.

[0073] It can be understood that after the front row 11 and the rear row 12 of the material strip have their overlaps removed by the front row trimming station 21 and the rear row trimming station 24, the rigidity of the entire double-row material strip 1 will be reduced, and the front row 11 and the rear row 12 of the material strip are separated from the concave fixing plate 2 by the provision of a plurality of movable floating pins 281, thereby reducing friction; since the front row 11 and the rear row 12 of the material strip are staggered by half a station, the movable floating pins 281 and the side lifting plates 283 cannot be provided at the junction of the first rear row stator buckle point punching station 25 and the front row blanking station 23, and therefore the plurality of movable floating pins 281 are provided. A fixed floating pin 282 is arranged, and in the process of feeding the front row 11 of the material strip from the front row stator buckle point punch position 22 to the front row blanking station 23, the fixed floating pin 282 and the side lifting plate 283 located between the front row stator buckle point punch position 22 and the front row blanking station 23 play the role of lifting the front row 11 of the material strip; in addition, in the process of feeding the rear row 12 of the material strip from the second rear row stator buckle point punch position 26 to the rear row blanking station 27, the side lifting plates 283 on both sides located between the second rear row stator buckle point punch position 26 and the rear row blanking station 27 lift the rear row 12 of the material strip.

[0074] Please continue reading Figure 6 The movable floating nail 281 includes a nail tail portion 2811 embedded in the recessed fixing plate 2 and a nail head portion 2812 disposed above the upper end surface of the recessed fixing plate 2 .

[0075] When in use, the lower end surface of the double-row material strip 1 contacts the upper end surface of the nail head 2812 to lift the double-row material strip 1. When the stamping upper die is pressed down, the movable floating nail 281 moves downward to be flush with the upper end surface of the concave fixing plate 2 for stamping processing.

[0076] Please continue reading Figure 3 , Figure 4 , Figure 6 , wherein the fixed floating pin 282 includes a connecting portion 2821, a first step 2822 and a first supporting portion 2823 which are arranged in sequence; the connecting portion 2821 is embedded in the recessed fixing plate 2; the first step 2822 is flush with the upper end surface of the recessed fixing plate 2; and the first supporting portion 2823 is higher than the upper end surface of the recessed fixing plate 2.

[0077] Specifically, the fixed floating pin 282 is fixed to the concave fixing plate 2 by the connecting portion 2821; the first step 2822 is flush with the upper end surface of the concave fixing plate 2, and is used to avoid the upper mold of the first rear-row stator buckle point punch 25 to prevent the upper mold of the first rear-row stator buckle point punch 25 from colliding with the upper mold of the first rear-row stator buckle point punch 25 and causing damage to the mold; the first supporting portion 2823 is higher than the upper end surface of the concave fixing plate 2. When the front row 11 of the material strip is fed, the first supporting portion 2823 is used to cooperate with the side lifting plate 283 to lift the front row 11 of the material strip from both sides. When the rear row 12 of the material strip is fed, the first supporting portion 2823 is used to cooperate with multiple movable floating pins 281 to lift the rear row 12 of the material strip.

[0078] Please read further Figure 4 , wherein the front blanking station 23 includes a front blanking outer shape hole 231 ; the first support portion 2823 includes a front side surface 28231 ; the front side surface 28231 is in contact with the hole wall of the front blanking outer shape hole 231 .

[0079] Under this arrangement, the first support part 2823 can both play a lifting role and avoid the upper die of the front blanking station 23 to prevent the upper die of the front blanking station 23 from colliding with the first support part 2823 during stamping and damaging the die.

[0080] Please continue reading Figure 6 , Figure 7 , wherein the side lifting plate 283 includes a side connecting plate 2831 and a slope portion 2832 ; the height of the slope portion 2832 gradually increases along the forward direction of the double-row material strip 1 .

[0081] It can be understood that the side lifting plate 283 is arranged behind the front stator buckle point punching position 22 and the first rear stator buckle point punching position 25. In the aforementioned two workstations, the material strip will be pressed down by the upper mold. When the upper mold is lifted, the height of the material strip is relatively low. Therefore, through the setting of the slope portion 2832, the material strip can be lifted again from a lower height.

[0082] Please read further Figure 7 , wherein the slope portion 2832 includes a first slope surface 28321 lower than the upper end surface of the recessed fixing plate 2, a second slope surface 28322 inclined upward from the upper end surface of the recessed fixing plate 2, and a third slope surface 28323 extending along the second slope surface 28322; the angle of the first slope surface 28321 is equal to the angle of the second slope surface 28322; the angle of the second slope surface 28322 is greater than the angle of the third slope surface 28323; the highest point of the third slope surface 28323 is flush with the first support portion 2823.

[0083] Specifically, when the upper mold is lifted, the height of the material strip is relatively low. In some cases, the material strip is still attached to the concave fixing plate 2. Therefore, the present invention is provided with a first slope 28321 which is lower than the upper end surface of the concave fixing plate 2. Under this arrangement, even if the material strip is still attached to the concave fixing plate 2, it can be lifted smoothly, and then lifted to a suitable height through the second slope 28322 and the third slope 28323; in addition, the angle of the first slope 28321 is equal to the angle of the second slope 28322, and the angle of the second slope 28322 is greater than the angle of the third slope 28323. Under this arrangement, the material strip can be lifted faster and more significantly when passing through the shorter first slope 28321 and the second slope 28322. When passing through the longer third slope 28323, the lifting angle becomes smaller, the lifting is more stable, and the material strip can be prevented from shaking; the highest point of the third slope 28323 is flush with the first support portion 2823, so as to smoothly deliver the material strip to the blanking station.

[0084] Please continue reading Fig. 9 The movable floating pins 281 include the movable floating pins in the A zone arranged at the front stator buckle point punching position 22, the movable floating pins in the B zone arranged at the first rear stator buckle point punching position 25, the movable floating pins in the C zone arranged at the second rear stator buckle point punching position 26, and the movable floating pins in the D zone arranged at the junction of the first rear stator buckle point punching position 25 and the front blanking station 23;

[0085] The height of the movable floating pins in area A is equal to the height of the movable floating pins in area B;

[0086] In the feeding path of the front row 11 of the material strip, the height of the movable floating pins in the D zone is greater than the height of the movable floating pins in the A zone, and the height of the first supporting portion 2823 is greater than the height of the movable floating pins in the D zone;

[0087] In the feeding path of the rear row 12 of the material strip, the height of the movable floating pin in area B is less than that of the movable floating pin in area D, the height of the movable floating pin in area D is less than that of the movable floating pin in area C, and the height of the movable floating pin in area C is less than or equal to the height of the highest point of the third slope 28323.

[0088] Through the zoning setting of the movable floating pins in the four areas of A, B, C, and D, the height of the material strip is gradually increased during the process of being fed from the stator buckle point punching station to the blanking station, which is beneficial to increasing the feeding speed and improving the stamping efficiency. In addition, the material strip reaches the highest height before the blanking station. After entering the blanking station, the material strip is suspended and droops naturally so as to be close to the blanking lower die, so as to punch out iron core pieces with smaller errors.

[0089] For further information, please refer to Fig.10In the feeding path of the rear row 12 of the material strip, the rear row 12 of the material strip is gradually lifted by the movable floating pins in the B zone and the movable floating pins in the C zone, and when lifted by the two side lifting plates 283 located between the second rear row stator buckle point punch position 26 and the rear row blanking station 27, the height of the rear row 12 of the material strip reaches the maximum; in addition, in the process of feeding the rear row 12 of the material strip from the first rear row stator buckle point punch position 25 to the second rear row stator buckle point punch position 26, the rear row 12 of the material strip is jointly lifted by the movable floating pins in the C zone and the movable floating pins in the D zone, and because the height of the movable floating pins in the B zone is smaller than the height of the movable floating pins in the D zone, the rear row 12 of the material strip will generate an upward tilt when lifted by the movable floating pins in the B zone and the movable floating pins in the D zone, so that it can smoothly pass through the first support portion 2823 with a higher height.

[0090] For further information, please refer to Fig.11 In the feeding path of the front row 11 of the material strip, the front row 11 of the material strip is lifted by the movable floating pins in area A, and when lifted by the first support portion 2823 and the side lifting plate 283, the height of the front row 11 of the material strip reaches the maximum; in addition, in the process of feeding the front row 11 of the material strip from the front row stator buckle point punching position 22 to the front row blanking station 23, the front row 11 of the material strip is jointly lifted by the movable floating pins in area A and the movable floating pins in area D, and the height of the movable floating pins in area A is less than the height of the movable floating pins in area D. When the front row 11 of the material strip is jointly lifted by the movable floating pins in area A and the movable floating pins in area D, an inclined upward angle will be generated so that it can smoothly pass through the first support portion 2823 with a higher height.

[0091] It can be understood that the height of the movable floating pin in the aforementioned area A = the height of the movable floating pin in the area B = height h1; the height of the movable floating pin in the aforementioned area D = height h2; the height of the movable floating pin in the aforementioned area C = height h4; the height of the highest point of the aforementioned third slope 28323 = the height of the first support part 2823 = height h3 = height h5.

[0092] Please continue reading Figure 2 , which also includes a blanking limit plate 3; multiple blanking limit plates 3 are arranged at the front blanking station 23 and the rear blanking station 27, so as to limit the suspended material strip, reduce its vibration, and make the stamping position more accurate.

[0093] Please continue reading Figure 3 , Figure 5 , further comprising a guide pin 4; a plurality of guide pins 4 are arranged at the front stator buckle point punching position 22, the first rear stator buckle point punching position 25 and the second rear stator buckle point punching position 26, so as to guide when punching the stator buckle point, so that the punching of the stator buckle point is more accurate.

[0094] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A method for manufacturing a core strip with no overlap at the tail, characterized in that: The following steps are involved: Step A, loading: feeding the double-row material strip (1) into the concave fixing plate (2) and continuously conveying it in steps in the direction of blanking; Step B, overlap processing: in the process of feeding the double-row material strip (1) forward step by step, the rotor sheets and the stator sheets are punched out in the front row (11) and the rear row (12) of the material strip in steps; Step C, cutting off the overlapping edges: in the process of the double-row material strip (1) being fed forward in a stepwise manner, the overlapping edges of the front row (11) and the rear row (12) of the material strip are respectively cut off at the front row trimming station (21) and the rear row trimming station (24); Step D, punching the stator buckle points: in the process of feeding the front row (11) of the material strip from the front row trimming station (21) to the front row stator buckle point punching position (22) and feeding the rear row (12) of the material strip from the rear row trimming station (24) to the first rear row stator buckle point punching position (25), the side limiting mechanism (29) limits the front row (11) and the rear row (12) of the material strip respectively from the outside, and the plurality of movable floating pins (281) located at the front row stator buckle point punching position (22) and the first rear row stator buckle point punching position (25) lift the front row (11) and the rear row (12) of the material strip respectively, and punch out the stator buckle points of the front row (11) and the rear row (12) of the material strip at the front row stator buckle point punching position (22) and the first rear row stator buckle point punching position (25); Step E, first blanking of stator sheets: in the process of feeding the front row (11) of the material strip from the front row stator buckle point punching position (22) forward to the front row blanking station (23) and feeding the rear row (12) of the material strip from the first rear row stator buckle point punching position (25) forward to the second rear row stator buckle point punching position (26), the fixed floating pins (282) and the side lifting plates (283) respectively lift the front row (11) of the material strip from both sides, and the stator sheets are first blanked at the front row blanking station (23), and the plurality of movable floating pins (281) and the fixed floating pins (282) lift the rear row (12) of the material strip, and repeatedly punch the stator buckle points of the rear row (12) of the material strip at the second rear row stator buckle point punching position (26); Step F, second blanking of stator sheets: During the process of the rear row (12) of the material strip being fed forward from the second rear row stator buckle punching position (26) to the rear row blanking station (27), two side lifting plates (283) lift the rear row (12) of the material strip from both sides respectively, and the stator sheets are punched out for the second time at the rear row blanking station (27).

2. The method for manufacturing a core with no tail overlap strip according to claim 1, characterized in that: In step C: the overlap edges cut off include the outer overlap edges of the stator sheets and the inner overlap edges of the stator sheets.

3. The method for manufacturing a core strip with no tail overlap according to claim 1, characterized in that: In step D: the movable floating pin (281) lifts the front row (11) and the rear row (12) of the material strip to a height h1 along the feeding direction, and the upper dies of the front row stator buckle point punching position (22) and the first rear row stator buckle point punching position (25) are simultaneously pressed down to punch out stator buckle points in the front row (11) and the rear row (12) of the material strip.

4. The method for manufacturing a core with no overlap at the tail end according to claim 1, characterized in that: The front blanking station (23) comprises a front blanking outer shape hole (231), and step E comprises the following sub-steps: Step e1: when the front row (11) of the material strip is located at the front row stator buckle point punching position (22), the front row (11) of the material strip is lifted to a height h1 by the movable floating pin (281); Step e2: during the process of feeding the front row of the material strip (11) from the front row stator buckle punching position (22) to the front row blanking station (23), the front row of the material strip (11) is lifted from the height h2 to the height h3 by the fixed floating pins (282) and the side lifting plates (283); Step e3: After the front row of material strip (11) is located at the front row blanking station (23), it naturally hangs down from the height h3 and is staggered with the fixed floating pins (282) and the side lifting plates (283). The blanking upper die is pressed downward to punch out the stator sheets from the front row blanking outer holes (231).

5. The method for manufacturing a core strip with no tail overlap according to claim 4, characterized in that: In step e1, when the rear row (12) of the material strip is located at the first rear row stator buckle point punching position (25), the rear row (12) of the material strip is lifted to a height h1 by the movable floating pin (281); In step e2, during the process of feeding the rear row (12) of the material strip from the first rear row stator buckle point punching position (25) to the second rear row stator buckle point punching position (26), the rear row (12) of the material strip is lifted to a height h4 by the movable floating pins (281) and the fixed floating pins (282); In step e3, the upper die of the second rear row stator buckle point punching position (26) is pressed downward to punch the stator buckle points of the rear row (12) of the material strip again.

6. The method for manufacturing a core strip with no tail overlap according to claim 5, characterized in that: The rear row blanking station (27) comprises a rear row blanking outer shape hole (271); step F comprises the following sub-steps: Step f1: when the rear row (12) of the material strip is located at the second rear row stator buckle point punching position (26), the rear row (12) of the material strip is lifted to a height h4 by the movable floating pins (281) and the fixed floating pins (282); Step f2: during the process of feeding the rear row (12) of the material strip from the second rear row stator buckle punching position (26) to the rear row blanking station (27), the rear row (12) of the material strip is lifted to a height h5 by the two side lifting plates (283); Step f3: After the rear row of the material strip (12) is located at the rear row blanking station (27), it naturally hangs down from the height h5 and is staggered with the two side lifting plates (283), and the blanking upper die is pressed downward to punch out the stator sheet from the rear row blanking outer shape hole (271).

7. The method for manufacturing a core strip with no tail overlap according to claim 6, characterized in that: Height h1<height h2<height h4≤height h3=height h5.

8. The method for manufacturing a core strip with no tail overlap according to claim 6, characterized in that: In step e2, the two limiting mechanisms (29) are staggered by half a station and are respectively arranged on the outside of the front row (11) and the rear row (12) of the material strip.

9. The method for manufacturing a core strip with no tail overlap according to claim 6, characterized in that: In step f2, the limiting mechanism (29) limits the position of the rear row (12) of the material strip from both sides.

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