A material-saving stamping manufacturing process for a straight-bar-wound round iron core

Abstract

The invention discloses a manufacturing process for stamping a straight bar wound around a round iron core in a material-saving manner. A material strip is fed into a stamping device and continuously conveyed in a blanking direction in a continuous step-by-step manner. The manufacturing process specifically comprises the following steps: step 1, feeding; step 2, stamping a guide hole; step 3, stamping a characteristic hole; step 4, blanking a first stator straight bar; step 5, blanking a second stator straight bar; step 6, cutting off waste materials. The manufacturing process of the invention eliminates the step of punching an inner hole in one step, adopts integral blanking to form the first stator straight bar and the second stator straight bar, and stamps the material strip through a blanking punch of a specific shape. Before the first row of blanking is performed, all the blanking processes to be blanked before the second row of blanking are completed, thereby improving the strength of the material strip, and obtaining a product with high strength and integrity. At the same time, the overlap value of the product is reduced, and the utilization rate of the material strip is improved.

Description

Technical Field

[0001] The invention relates to the technical field of straight bar iron core stamping, and in particular to a material-saving stamping manufacturing process for straight bar wound round iron core. Background Art

[0002] The straight iron core stamping progressive dies currently on the market have extremely high overlap values ​​in product layout, so the products produced are costly and have low material utilization rates. In addition, in the conventional stamping process, after the first row of blanking is completed, the material strip still has overlap values ​​in the feeding direction. The process of removing the overlap will affect the material strip, resulting in poor strength of the material strip. The shape and buckle point forming dimensions of the second row to be punched will be unstable, resulting in unqualified product tolerances or poor buckle point dimensions, and the product cannot be stacked and riveted into a complete iron core. Summary of the invention

[0003] In view of the shortcomings and defects of the prior art, a manufacturing process for material-saving stamping of a straight bar wound round iron core is provided. In order to achieve the purpose of improving material utilization, saving materials and reducing costs and improving the overall strength of the product, the present invention provides the following technical solutions.

[0004] The technical solution of the present invention is a manufacturing process for stamping a round iron core with a straight bar to save material. The material strip is fed into a stamping device, and is continuously conveyed in a step-by-step manner in the blanking direction. The corresponding punching dies are used to punch out the material strips in sequence, and finally a first stator straight bar and a second stator straight bar are punched out on the material strip. The first stator straight bar and the second stator straight bar both include a yoke, a tooth portion, and an inner hole portion. The preformed first stator straight bar and the second stator straight bar are staggered and arranged opposite to each other, and the outer contours of the yokes are against each other.

[0005] The manufacturing process specifically includes the following steps:

[0006] Step 1, loading: feed the material strip into the stamping equipment, so that the material strip is continuously fed forward on the stamping equipment, and the material head of the material strip is punched flat by adjusting the manual draw plate;

[0007] Step 2, punching guide holes: During the forward feeding of the material strip, the first guide holes are formed at the edges of both sides of the material strip after each step, and the second guide hole is punched out in the middle of the material strip;

[0008] Step 3, punching characteristic holes: punching characteristic holes in the first stator straight bar preformed portion and the second stator straight bar preformed portion on the material strip during the forward feeding of the material strip;

[0009] Step 4, blanking the first stator straight bar: in the process of feeding the material strip forward, the material strip where the characteristic hole is punched out in step 3 is blanked to obtain the first stator straight bar, and enters the blanking die; the first punch for punching the first stator straight bar includes a plurality of yoke blanking areas and a tooth blanking area connected to the yoke blanking area, and the two ends of the yoke blanking area are respectively provided with a connecting protrusion and a connecting groove;

[0010] Step 5, blanking the second stator straight bar: in the process of feeding the material strip forward, the material strip where the characteristic hole is punched out in step 3 is blanked to obtain the second stator straight bar, and the second stator straight bar is put into the blanking die; the outer contour shape of the second blanking punch for punching the second stator straight bar is the same as the outer contour shape of the first blanking punch, and the second blanking punch is arranged opposite to the first blanking punch and staggered;

[0011] Step 6, waste cutting: in the process of feeding the material belt forward, after the first stator straight bar and the second stator straight bar are blanked, waste is obtained and the waste is cut.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the manufacturing process of the present invention eliminates the step of punching the inner hole, and adopts the integral blanking to form the first stator straight bar and the second stator straight bar to punch the material strip through a blanking punch of a specific shape. Before the first row of blanking, all the blanking processes before the second row of blanking are completed, which improves the strength of the material strip, and the obtained product has higher strength and integrity. At the same time, the overlap value of the product is reduced, and the utilization rate of the material strip is improved.

[0013] At the same time, in step 4 and step 5, the first stator straight bar and the second stator straight bar preformed on the material strip are offset and arranged opposite to each other, and the outer contour lines of the yoke are offset. The characteristic of this layout is that the outer contour lines of the yoke are on the same side, so after the first stator straight bar is blanked, when the second stator straight bar is punched, the common edge part does not need to be punched, so the punching force of the mold is smaller than that of the conventional mold, the inner hole is not punched first, and the overall blanking forming is adopted, and the punching force is further reduced; the outer contour lines of the yoke of the first stator straight bar and the second stator straight bar are offset. Under the premise of the same material width, the new layout method is shorter in the step direction than the conventional layout method, thereby improving the overall utilization rate of the material strip.

[0014] In step 1, the material head is punched before starting stamping. Conventional molds rely on manual trimming of the material strip, which is uneven, resulting in a lot of small waste in subsequent punching, affecting product precision and easily getting stuck in the gap of the mold, which is difficult to find and clean.

[0015] In the aforementioned manufacturing process of material-saving stamping of a straight bar wound round iron core, in step 2, the diameter of the first guide hole is φ6mm, and the diameter of the second guide hole is φ3mm.

[0016] In the aforementioned manufacturing process of material-saving stamping of a straight bar wound round iron core, in step 3, the step of punching out the characteristic hole is as follows:

[0017] Step 301, punching out first shape notches: in the process of feeding the material strip forward, punching out a plurality of first shape notches in a region on one side of the first stator straight bar yoke away from the tooth portion;

[0018] Step 302, punching out a first triangular notch: punching out a first triangular notch in a side area of ​​the first stator straight bar yoke portion close to the tooth portion during the forward feeding of the material strip;

[0019] Step 303, punching out second shape notches: in the process of feeding the material strip forward, punching out a plurality of second shape notches in a region on one side of the second stator straight bar yoke away from the tooth portion;

[0020] Step 304, punching out a second triangular notch: punching out a second triangular notch in a side area of ​​the second stator straight bar yoke portion close to the tooth portion during the forward feeding of the material strip;

[0021] Step 305, punching out the first buckle point: punching out the first buckle point or the first through-sheet hole in the yoke and tooth regions of the first stator straight bar during the forward feeding of the material strip;

[0022] Step 306, punching out the second buckle point: in the process of feeding the material strip forward, punching out the second buckle point or the second through-sheet hole in the yoke and tooth area of ​​the second stator straight bar.

[0023] Through steps 301 , 302 , 303 , 304 , 305 and 306 , characteristic holes are processed on the first stator straight bar and the second stator straight bar, and blanking operation is performed after forming the characteristic holes, thereby improving the overall strength of the product.

[0024] In the aforementioned manufacturing process of material-saving stamping of a straight bar wound around a round iron core, the outer contour line of the inner hole portion of the preformed second stator straight bar abuts against the inner contour line of the yoke portion of the first stator straight bar, and the side contour line of the inner hole portion of the second stator straight bar abuts against the side contour line of the tooth portion of the first stator straight bar; in step 3, the steps of punching out the characteristic holes in this arrangement are as follows:

[0025] Step 311, punching out process circular holes: in the process of feeding the material strip forward, punching out a plurality of first process circular holes in the yoke region of the first stator straight bar, and punching out a plurality of second process circular holes in the yoke region of the second stator straight bar;

[0026] Step 312, punching out the first buckle point: punching out the first buckle point or the first through-sheet hole in the yoke and tooth regions of the first stator straight bar during the forward feeding of the material strip;

[0027] Step 313, punching out the second buckle point: punching out the second buckle point or the second through-sheet hole in the yoke and tooth area of ​​the second stator straight bar during the forward feeding of the material strip;

[0028] Step 314, punching out a first splicing hole: in the process of feeding the material strip forward, a first splicing hole is punched out on the right side of the first process circular hole in the yoke area of ​​the first stator straight bar by a first splicing punch;

[0029] Step 315, punching out a second splicing hole: in the process of feeding the material strip forward, a second splicing hole is punched out on the left side of the second process circular hole in the yoke area of ​​the second stator straight bar by a second splicing punch;

[0030] Step 316, punching out slot-shaped holes: in the process of feeding the material strip forward, punching out slot-shaped holes between the teeth of the first stator straight bar and the teeth of the second stator straight bar.

[0031] The first stator straight bar and the second stator straight bar formed by the above steps not only have the outer contour lines of the yoke part counteracting each other, but also the outer contour line of the inner hole part of the second stator straight bar counteracts the inner contour line of the yoke part of the first stator straight bar, and the side contour line of the inner hole part of the second stator straight bar counteracts the side contour line of the tooth part of the first stator straight bar, which can improve the utilization rate of the material strip.

[0032] In the aforementioned manufacturing process for material-saving stamping of a straight bar wound around a round iron core, in steps 305, 306, 312 and 313, a draw plate is provided below the material strip, and the relative position between the stamping punch and the draw plate is changed to form a first buckle point or a first through-piece hole and a second buckle point or a second through-piece hole on the material strip.

[0033] By adjusting the relative positions of the punch and the draw plate under the material strip, the punching buckle points or through-holes can be controlled, which is easy to operate.

[0034] In the aforementioned manufacturing process of material-saving stamping of straight bars around round iron cores, in step 4, a first blanking locking structure is arranged in the blanking die, and the first blanking locking structure includes a first limiting column, a second limiting column, a third limiting column and a fourth limiting column. The first limiting column abuts against the yoke of the first stator straight bar, the second limiting column and the third limiting column abut against both sides of the tooth portion of the first stator straight bar, and the fourth limiting column abuts against the inner hole portion of the first stator straight bar.

[0035] The locking of the first stator straight bar mold increases the locking of the inner hole compared to the locking of the conventional mold. Because the inner hole is not punched first, the overall blanking is adopted to prevent the first stator straight bar from shifting during blanking, thereby improving the accuracy of the finished product.

[0036] In the aforementioned manufacturing process of material-saving stamping of straight bars around round iron cores, in step 5, a second blanking locking mechanism is arranged in the blanking die, and the second blanking locking structure includes a fifth limiting column, a sixth limiting column and a seventh limiting column. The fifth limiting column and the sixth limiting column abut against both sides of the tooth portion of the second stator straight bar, and the seventh limiting column abuts against the inner hole portion of the second stator straight bar.

[0037] The locking of the second stator straight bar is less than that of the first stator straight bar, because the common edge part of the outer contour of the yoke is not subjected to force during punching, and the material will run to the right, so the right side and the middle part are locked, and the common edge part does not need to be locked, saving manufacturing materials and costs.

[0038] The aforementioned manufacturing process for stamping a straight bar wound around a round iron core to save material has a step of punching the first guide nail before step 4. During the process of feeding the bar material forward in steps, the first guide nail is punched at the first guide hole after each step; and before step 5, there is a step of punching the second guide nail. During the process of feeding the bar material forward in steps, the second guide nail is punched at the second guide hole after each step.

[0039] The first stator straight bar and the second stator straight bar arrangement of this process use a group of guiding pins, and the new straight bar arrangement also uses only one group of intermediate guiding pins. The first guiding pins are arranged before and after the blanking of the first stator straight bar, which improves the accuracy during blanking and eliminates errors. The second guiding pins are arranged before and after the blanking of the second stator straight bar, which further reduces and eliminates molding errors and improves the strength of the material bar after product blanking.

[0040] In the aforementioned manufacturing process of stamping straight bars around round iron cores to save material, in steps 4 and 5, the outer contour shape of the first blanking punch is the same as the outer contour shape of the formed first stator straight bar, and the outer contour shape of the second blanking punch is the same as the outer contour shape of the formed second stator straight bar.

[0041] Through the above improvements, the first stator straight bar and the second stator straight bar can be more accurately formed through the first blanking punch and the second blanking punch, thereby improving the accuracy during manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the process flow of the present invention;

[0043] Figure 2 This is a partial enlarged schematic diagram of point A on the material strip;

[0044] Figure 3 It is a schematic structural diagram of a preformed first stator straight bar and a second stator straight bar;

[0045] Figure 4This is a schematic diagram of the process flow of the second mode of the present invention;

[0046] Figure 5 This is a partial enlarged schematic diagram of point B on the material strip;

[0047] Figure 6 It is a schematic diagram of the structure of the first stator straight bar and the second stator straight bar of the second preformed structure;

[0048] Figure 7 It is a schematic diagram of the locking condition of the first stator straight bar during blanking;

[0049] Figure 8 It is a schematic diagram of the locking condition of the first stator straight bar during blanking;

[0050] Fig. 9 The process flow diagram of the third mode of the present invention is as follows;

[0051] Fig.10 This is a schematic diagram of the third type of preformed first stator straight bar and second stator straight bar structure.

[0052] Among them, 100, punching head station; 101, punching guide hole station; 102, punching first shape notch station; 103, punching first triangular notch station; 104, punching second shape notch station; 105, punching second triangular notch station; 106, punching first buckle point station; 107, punching second buckle point station; 108, first blanking station; 109, second blanking station; 110, waste cutting station; 111, punching process round hole station; 112, punching First combined punch station; 113, punching second combined punch station; 114, punching slot-shaped hole station; 115, punching dovetail slot station; 1, material strip; 1.1, first guide hole; 1.2, second guide hole; 1.3, slot-shaped hole; 1.4, dovetail slot; 1.5, scrap; 2, first stator straight bar; 2.1, yoke; 2.2, tooth; 2.3, inner hole; 2.4, first outer notch; 2.5, first triangular notch; 2.6, first buckle point; 2.7, first through-sheet hole; 2.8, first process round hole; 2.9, first splicing punch; 2.10, first splicing hole; 3, second stator straight bar; 3.1, second shape notch; 3.2, second triangular notch; 3.3, second buckle point; 3.4, second through-sheet hole; 3.5, second process round hole; 3.6, second splicing punch; 3.7, second splicing hole; 4, first stamping punch; 5, second stamping punch; 6, first blanking punch; 6. 1. Yoke blanking area; 6.2. Tooth blanking area; 6.3. Connecting protrusion; 6.4. Connecting groove; 7. Second blanking punch; 8. First blanking locking structure; 8.1. First limiting column; 8.2. Second limiting column; 8.3. Third limiting column; 8.4. Fourth limiting column; 9. Second blanking locking structure; 9.1. Fifth limiting column; 9.2. Sixth limiting column; 9.3. Seventh limiting column; 10. Blanking die; 11. Waste cutting mechanism. DETAILED DESCRIPTION

[0053] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0054] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and 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 operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0055] Embodiment 1: A manufacturing process for stamping a straight bar around a round iron core to save material, the process flow is as follows Figure 1As shown, in the step-by-step forward feeding direction of the material strip 1, there are respectively provided a punching head station 100, a guide hole punching station 101, a first outer shape notch punching station 102, a first triangular notch punching station 103, a second outer shape notch punching station 104, a second triangular notch punching station 105, a first buckle point punching station 106, a second buckle point punching station 107, a first blanking station 108, a second blanking station 109 and a waste 1.5 cutting station 110.

[0056] like Figure 3 As shown, the material strip 1 is fed into the stamping equipment, and is continuously conveyed in the blanking direction in a continuous step-by-step manner. The corresponding blanking dies are used to perform blanking on the material strip 1 in sequence, and finally the first stator straight bar 2 and the second stator straight bar 3 are punched out on the material strip 1. The first stator straight bar 2 and the second stator straight bar 3 both include a yoke 2.1, a tooth 2.2 and an inner hole 2.3. The outer contour shape of the yoke 2.1 of the preformed first stator straight bar 2 and the second stator straight bar 3 can be a straight line or an arc. The outer shape of the second stator straight bar 3 is consistent with the shape of the first stator straight bar 2. The outer contour lines of the arc-shaped or straight-line first stator straight bar 2 and the second stator straight bar 3 are offset, but the tooth 2.2 of the second stator straight bar 3 is opposite to the tooth 2.2 of the first stator straight bar 2, and the first stator straight bar 2 and the second stator straight bar 3 are staggered.

[0057] The manufacturing process of the straight bar wound round iron core material saving stamping specifically includes the following steps:

[0058] Step 1, loading: feed the material strip 1 onto the stamping equipment, so that the material strip 1 is continuously fed forward on the stamping equipment, and the material head of the material strip 1 is punched flat by adjusting the manual draw plate.

[0059] A punch head station 100 is designed at the entrance of the mold, and the material strip 1 is punched neatly by the punch head station 100. Conventional molds rely on manual trimming of the material strip 1, which is uneven, resulting in a lot of small waste 1.5 in subsequent punching, which affects product precision and is easy to get stuck in the gap of the mold, making it difficult to find and clean.

[0060] Step 2, punching guide holes: in the process of feeding the material strip 1 forward, after each step, first guide holes 1.1 with a diameter of φ6mm are formed at the edges of both sides of the material strip 1, and a second guide hole 1.2 with a diameter of φ3mm is punched out in the middle of the material strip 1; after each step, the guide hole punching station 101 punches the first guide holes 1.1 on both sides of the length direction of the material strip 1 once, and punches the second guide holes 1.2 in the middle of the length direction of the material strip 1 once, so that the first guide holes 1.1 are arranged in two straight rows in the forward stepping direction of the material strip 1, and the second guide holes 1.2 are arranged in one row in the stepping direction of the material strip 1, and the first guide holes 1.1 and the second guide holes 1.2 in each row are evenly spaced.

[0061] Step 3, punching characteristic holes: in the process of feeding the material strip 1 forward, punching characteristic holes in the preformed portion of the first stator straight bar 2 and the preformed portion of the second stator straight bar 3 on the material strip 1. The steps of punching the characteristic holes are as follows:

[0062] Step 301, punching out first contour notches 2.4: in the process of feeding the material strip 1 forward, punching out a plurality of first contour notches 2.4 in the area on one side of the yoke 2.1 of the first stator straight bar 2 away from the tooth portion 2.2;

[0063] Step 302, punching out the first triangular notch 2.5: in the process of feeding the material strip 1 forward, punching out the first triangular notch 2.5 in the area on one side of the yoke 2.1 of the first stator straight bar 2 close to the tooth 2.2;

[0064] Step 303, punching out the second outer shape notches 3.1: in the process of feeding the material strip 1 forward, punching out a plurality of second outer shape notches 3.1 in the area on one side of the yoke 2.1 of the second stator straight bar 3 away from the tooth portion 2.2;

[0065] Step 304, punching out the second triangular notch 3.2: in the process of feeding the material strip 1 forward, punching out the second triangular notch 3.2 in the area on one side of the yoke 2.1 of the second stator straight bar 3 close to the tooth 2.2;

[0066] Step 305, punching out the first buckle point 2.6: punching out the first buckle point 2.6 or the first through-sheet hole 2.7 in the yoke 2.1 and tooth 2.2 regions of the first stator straight bar 2 during the forward feeding of the material strip 1;

[0067] Step 306 , punching out the second buckle point 3 . 3 : punching out the second buckle point 3 . 3 or the second through-hole 3 . 4 in the yoke 2 . 1 and the tooth 2 . 2 area of ​​the second stator straight bar 3 during the forward feeding of the material strip 1 .

[0068] After the operations of step 301, step 302, step 303, step 304, step 305 and step 306, the distribution of the characteristic holes formed on the strip 1 is as follows: Figure 1 as well as Figure 2 shown.

[0069] In step 305 and step 306, a draw plate is provided below the material strip 1, and when the draw plate is directly below the first stamping punch 4 on the first buckle point punching station 106, a first through-piece hole 2.7 is formed on the material strip 1; when the draw plate and the first stamping punch 4 on the first buckle point punching station 106 are offset, a first buckle point 2.6 is formed on the material strip 1; when the draw plate is directly below the second stamping punch 5 on the second buckle point punching station 107, a second through-piece hole 3.4 is formed on the material strip 1; when the draw plate and the second stamping punch 5 on the second buckle point punching station 107 are offset, a second buckle point 3.3 is formed on the material strip 1; this facilitates stacking of the first stator straight bar 2 and the second stator straight bar 3.

[0070] Step 4, blanking the first stator straight bar 2: during the forward feeding process of the material strip 1, the material strip 1 with the characteristic hole punched out in step 3 is blanked to obtain the first stator straight bar 2, and enters the blanking die 10; the first blanking punch 6 for punching the first stator straight bar 2 includes a plurality of yoke 2.1 blanking areas and a tooth 2.2 blanking area connected to the yoke 2.1 blanking area, and connecting protrusions 6.3 and connecting grooves 6.4 are respectively provided at both ends of the yoke 2.1 blanking area.

[0071] like Figure 7 As shown, a first blanking locking structure 8 is arranged below the first blanking station 108 in the blanking die 10. The first blanking locking structure 8 includes a first limiting column 8.1, a second limiting column 8.2, a third limiting column 8.3 and a fourth limiting column 8.4. The first limiting column 8.1 abuts against the yoke 2.1 of the first stator straight bar 2, the second limiting column 8.2 and the third limiting column 8.3 abut against both sides of the tooth portion 2.2 of the first stator straight bar 2, and the fourth limiting column 8.4 abuts against the inner hole portion 2.3 of the first stator straight bar 2. Since the inner hole of the first stator straight bar 2 is not punched first during blanking, integral blanking is adopted. The first limiting column 8.1, the second limiting column 8.2, the third limiting column 8.3 and the fourth limiting column 8.4 are used to ensure the blanking position of the first stator straight bar 2 during blanking to prevent displacement.

[0072] Before step 4, there is a step of punching the first guide nail. During the process of feeding the strip material forward step by step, the first guide nail is punched at the first guide hole 1.1 after each step. The first guide nail is arranged one step before the first stator straight bar 2 is blanked, which improves the accuracy of blanking and eliminates errors.

[0073] Step 5, blanking the second stator straight bar 3: during the forward feeding process of the material strip 1, the material strip 1 with the characteristic hole punched out in step 3 is blanked to obtain the second stator straight bar 3, and enters the blanking die 10; the outer contour shape of the second blanking punch 7 used for punching the second stator straight bar 3 is the same as the outer contour shape of the first blanking punch 6, and the second blanking punch 7 and the first blanking punch 6 are opposite and staggered.

[0074] like Figure 8 As shown, a second blanking locking structure 9 is arranged below the second blanking station 109 in the blanking die 10. The second blanking locking structure 9 includes a fifth limiting column 9.1, a sixth limiting column 9.2 and a seventh limiting column 9.3. The fifth limiting column 9.1 and the sixth limiting column 9.2 abut against both sides of the tooth portion 2.2 of the second stator straight bar 3, and the seventh limiting column 9.3 abuts against the inner hole portion 2.3 of the second stator straight bar 3. The locking of the blanking of the second stator straight bar 3 lacks the locking of the common edge portion of the yoke 2.1 as compared with the first stator straight bar 2. Because the common edge portion is not subjected to force during blanking, the material will run to the right. Therefore, the fifth limiting column 9.1 and the sixth limiting column 9.2 abut against both sides of the tooth portion 2.2 of the second stator straight bar 3, and the seventh limiting column 9.3 locks with the inner hole portion 2.3 of the second stator straight bar 3, thereby ensuring the blanking position of the second stator straight bar 3 and preventing it from being offset.

[0075] Before step 5, there is a step of punching the second guide nail. During the process of feeding the strip material forward step by step, the second guide nail is punched at the second guide hole 1.2 after each step. The previous step of blanking the second stator straight bar 3 and the arrangement of the second guide nail further improve the accuracy of blanking and eliminate errors.

[0076] Step 6, cutting the waste 1.5: During the forward feeding process of the material belt 1, the first stator straight bar 2 and the second stator straight bar 3 are blanked to obtain the waste 1.5, and the waste 1.5 is cut.

[0077] After the first stator straight bar 2 and the second stator straight bar 3 pass through the first blanking station 108 and the second blanking station 109, the blanking is completed and a number of wastes 1.5 are formed on the material strip 1. The wastes 1.5 are cut at the waste cutting station 110 by the waste 1.5 cutting mechanism to cut the wastes 1.5 into a number of sections to prevent the wastes 1.5 from being too long and getting stuck on the processing table.

[0078] Embodiment 2: A manufacturing process for stamping a straight bar around a round iron core to save material, the process flow is as follows Figure 4 As shown, in the step-by-step forward feeding direction of the material strip 1, there are respectively provided a punching head station 100, a guide hole punching station 101, a process round hole punching station 111, a first buckle point punching station 106, a second buckle point punching station 107, a first combined punch punching station 112, a second combined punch punching station 113, a slot hole punching station 114, a first blanking station 108, a second blanking station 109 and a waste 1.5 cutting station 110.

[0079] The material strip 1 is fed into the stamping equipment and continuously conveyed in the blanking direction in a continuous step-by-step manner. The corresponding blanking dies are used to perform blanking on the material strip 1 in sequence. Finally, the first stator straight bar 2 and the second stator straight bar 3 are punched out on the material strip 1. Figure 6As shown, the outer contour of the yoke 2.1 of the preformed first stator straight bar 2 and the second stator straight bar 3 is an arc shape, and the first stator straight bar 2 and the second stator straight bar 3 both include a yoke 2.1, a tooth portion 2.2 and an inner hole portion 2.3. The first stator straight bar 2 and the second stator straight bar 3 preformed on the material strip 1 are staggered.

[0080] The outer contour line of the inner hole portion 2.3 of the second stator straight bar 3 in the first group is counteracted with the inner contour line of the yoke portion 2.1 of the first stator straight bar 2 in the second group, and the side contour line of the inner hole portion 2.3 of the second stator straight bar 3 in the first group is counteracted with the side contour line of the tooth portion 2.2 of the first stator straight bar 2 in the second group.

[0081] The manufacturing process of the straight bar wound round iron core material saving stamping specifically includes the following steps:

[0082] Step 1, loading: feed the material strip 1 onto the stamping equipment, so that the material strip 1 is continuously fed forward on the stamping equipment, and the material head of the material strip 1 is punched flat by adjusting the manual draw plate.

[0083] A punch head station 100 is designed at the entrance of the mold, and the material strip 1 is punched neatly by the punch head station 100. Conventional molds rely on manual trimming of the material strip 1, which is uneven, resulting in a lot of small waste 1.5 in subsequent punching, which affects product precision and is easy to get stuck in the gap of the mold, making it difficult to find and clean.

[0084] Step 2, punching guide holes: During the process of feeding the material strip 1 forward, the first guide holes 1.1 are formed at the edges of both sides of the material strip 1 after each step.

[0085] After each step, the guide hole punching station 101 punches the first guide hole 1.1 on both sides of the length direction of the material strip 1. The diameter of the first guide hole 1.1 is φ5mm, so that the first guide holes 1.1 are arranged in two straight rows in the forward stepping direction of the material strip 1, and the first guide holes 1.1 in each row are evenly spaced.

[0086] Step 3, punching characteristic holes: in the process of feeding the material strip 1 forward, punching characteristic holes in the preformed portion of the first stator straight bar 2 and the preformed portion of the second stator straight bar 3 on the material strip 1. The steps of punching the characteristic holes are as follows:

[0087] Step 311, punching out process circular holes: in the process of feeding the material strip 1 forward, punch out a plurality of first process circular holes 2.8 in the yoke 2.1 region of the first stator straight bar 2, and punch out a plurality of second process circular holes 3.5 in the yoke 2.1 region of the second stator straight bar 3;

[0088] Step 312, punching out the first buckle point 2.6: punching out the first buckle point 2.6 or the first through-sheet hole 2.7 in the yoke 2.1 and the tooth 2.2 area of ​​the first stator straight bar 2 during the forward feeding of the material strip 1;

[0089] Step 313, punching out the second buckle point 3.3: punching out the second buckle point 3.3 or the second through-sheet hole 3.4 in the yoke 2.1 and the tooth 2.2 area of ​​the second stator straight bar 3 during the forward feeding process of the material strip 1;

[0090] Step 314, punching out the first splicing hole 2.10: in the process of feeding the material strip 1 forward, the first splicing hole 2.10 is punched out on the right side of the first process circular hole 2.8 in the yoke 2.1 area of ​​the first stator straight bar 2 by the first splicing punch 2.9;

[0091] Step 315, punching out the second splicing hole 3.7: in the process of feeding the material strip 1 forward, the second splicing hole 3.7 is punched out on the left side of the second process circular hole 3.5 in the yoke 2.1 area of ​​the second stator straight bar 3 by the second splicing punch 3.6;

[0092] Step 316 , punching out the slot-shaped hole 1 . 3 : in the process of feeding the material strip 1 forward, punching out the slot-shaped hole 1 . 3 between the teeth 2 . 2 of the first stator straight bar 2 and the teeth 2 . 2 of the second stator straight bar 3 .

[0093] After the operations of step 311, step 312, step 313, step 314, step 315 and step 316, the distribution of the characteristic holes formed on the strip 1 is as follows: Figure 4 as well as Figure 5 shown.

[0094] In step 312 and step 313, a draw plate is provided below the material strip 1, and when the draw plate is directly below the first stamping punch 4 on the first buckle point punching station 106, a first through-piece hole 2.7 is formed on the material strip 1; when the draw plate and the first stamping punch 4 on the first buckle point punching station 106 are offset, a first buckle point 2.6 is formed on the material strip 1; when the draw plate is directly below the second stamping punch 5 on the second buckle point punching station 107, a second through-piece hole 3.4 is formed on the material strip 1; when the draw plate and the second stamping punch 5 on the second buckle point punching station 107 are offset, a second buckle point 3.3 is formed on the material strip 1; this facilitates stacking of the first stator straight bar 2 and the second stator straight bar 3.

[0095] Step 4, blanking the first stator straight bar 2: during the forward feeding process of the material strip 1, the material strip 1 with the characteristic hole punched out in step 3 is blanked to obtain the first stator straight bar 2, and enters the blanking die 10; the first blanking punch 6 for punching the first stator straight bar 2 includes a plurality of yoke 2.1 blanking areas and a tooth 2.2 blanking area connected to the yoke 2.1 blanking area, and connecting protrusions 6.3 and connecting grooves 6.4 are respectively provided at both ends of the yoke 2.1 blanking area.

[0096] like Figure 7As shown, a first blanking locking structure 8 is arranged below the first blanking station 108 in the blanking die 10. The first blanking locking structure 8 includes a first limiting column 8.1, a second limiting column 8.2, a third limiting column 8.3 and a fourth limiting column 8.4. The first limiting column 8.1 abuts against the yoke 2.1 of the first stator straight bar 2, the second limiting column 8.2 and the third limiting column 8.3 abut against both sides of the tooth portion 2.2 of the first stator straight bar 2, and the fourth limiting column 8.4 abuts against the inner hole portion 2.3 of the first stator straight bar 2. Since the inner hole of the first stator straight bar 2 is not punched first during blanking, integral blanking is adopted. The first limiting column 8.1, the second limiting column 8.2, the third limiting column 8.3 and the fourth limiting column 8.4 are used to ensure the blanking position of the first stator straight bar 2 during blanking to prevent displacement.

[0097] Before step 4, there is a step of punching the first guide nail. During the process of feeding the strip material forward step by step, the first guide nail is punched at the first guide hole 1.1 after each step. The first guide nail is arranged one step before the first stator straight bar 2 is blanked, which improves the accuracy of blanking and eliminates errors.

[0098] Step 5, blanking the second stator straight bar 3: during the forward feeding process of the material strip 1, the material strip 1 with the characteristic hole punched out in step 3 is blanked to obtain the second stator straight bar 3, and enters the blanking die 10; the outer contour shape of the second blanking punch 7 used for punching the second stator straight bar 3 is the same as the outer contour shape of the first blanking punch 6, and the second blanking punch 7 and the first blanking punch 6 are opposite and staggered.

[0099] like Figure 8 As shown, a second blanking locking structure 9 is arranged below the second blanking station 109 in the blanking die 10. The second blanking locking structure 9 includes a fifth limiting column 9.1, a sixth limiting column 9.2 and a seventh limiting column 9.3. The fifth limiting column 9.1 and the sixth limiting column 9.2 abut against both sides of the tooth portion 2.2 of the second stator straight bar 3, and the seventh limiting column 9.3 abuts against the inner hole portion 2.3 of the second stator straight bar 3. The locking of the blanking of the second stator straight bar 3 lacks the locking of the common edge portion of the yoke 2.1 as compared with the first stator straight bar 2. Because the common edge portion is not subjected to force during blanking, the material will run to the right. Therefore, the fifth limiting column 9.1 and the sixth limiting column 9.2 abut against both sides of the tooth portion 2.2 of the second stator straight bar 3, and the seventh limiting column 9.3 locks with the inner hole portion 2.3 of the second stator straight bar 3, thereby ensuring the blanking position of the second stator straight bar 3 and preventing it from being offset.

[0100] Step 6, cutting the waste 1.5: During the forward feeding process of the material belt 1, the first stator straight bar 2 and the second stator straight bar 3 are blanked to obtain the waste 1.5, and the waste 1.5 is cut.

[0101] After the first stator straight bar 2 and the second stator straight bar 3 pass through the first blanking station 108 and the second blanking station 109, the blanking is completed and a number of wastes 1.5 are formed on the material strip 1. The wastes 1.5 are cut at the waste cutting station 110 by the waste 1.5 cutting mechanism to cut the wastes 1.5 into a number of sections to prevent the wastes 1.5 from being too long and getting stuck on the processing table.

[0102] Embodiment 3: A manufacturing process for stamping a straight bar around a round iron core to save material, the process flow is as follows Fig. 9 As shown, in the step-by-step forward feeding direction of the material strip 1, a punching head station 100, a guide hole punching station 101, a dovetail groove punching station 115, a first blanking station 108, a second blanking station 109 and a waste 1.5 cutting station 110 are respectively provided.

[0103] The material strip 1 is fed into the stamping equipment and continuously conveyed in the blanking direction in a continuous step-by-step manner. The corresponding blanking dies are used to perform blanking on the material strip 1 in sequence. Finally, the first stator straight bar 2 and the second stator straight bar 3 are punched out on the material strip 1. Fig.10 As shown, the first stator straight bar 2 and the second stator straight bar 3 preformed on the material strip 1 are arranged offset from each other.

[0104] The outer contour line of the inner hole portion 2.3 of the second stator straight bar 3 in the first group is counteracted with the inner contour line of the yoke portion 2.1 of the first stator straight bar 2 in the second group, and the side contour line of the inner hole portion 2.3 of the second stator straight bar 3 in the first group is counteracted with the side contour line of the tooth portion 2.2 of the first stator straight bar 2 in the second group.

[0105] The specific steps of the manufacturing process of material-saving stamping of straight bars around round iron core are consistent with the overall embodiment 2. When performing step 3, the punched characteristic hole is specifically presented as follows: a dovetail groove 1.4 is formed on the side of the yoke 2.1 of the first stator straight bar 2 and the second stator straight bar 3 close to the outer contour line by stamping at the dovetail groove punching station 115.

[0106] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A material-saving stamping manufacturing process for a straight bar wound round iron core, characterized in that: The material strip (1) is fed into a stamping device and continuously conveyed in a step-by-step manner in a blanking direction. The material strip (1) is punched out in sequence by corresponding punching dies. Finally, a first stator straight bar (2) and a second stator straight bar (3) are punched out on the material strip (1). The first stator straight bar (2) and the second stator straight bar (3) both include a yoke (2.1), a tooth portion (2.2) and an inner hole portion (2.3). The preformed first stator straight bar (2) and the second stator straight bar (3) are arranged in an offset manner and face each other, and the outer contours of the yoke (2.1) are against each other. The manufacturing process specifically includes the following steps: Step 1, feeding: feeding the material strip (1) into the stamping equipment, allowing the material strip (1) to continuously step forward on the stamping equipment, and stamping the material head of the material strip (1) flat by adjusting the manual draw plate; Step 2, punching guide holes: in the process of feeding the material strip (1) forward, after each step, the first guide holes (1.1) are formed at the edges of both sides of the material strip (1); Step 3, punching characteristic holes: in the process of feeding the material strip (1) forward, punching characteristic holes in the pre-formed portion of the first stator straight bar (2) and the pre-formed portion of the second stator straight bar (3) on the material strip (1); Step 4, blanking the first stator straight bar: in the process of feeding the material strip (1) forward, the material strip (1) where the characteristic hole is punched out in step S3 is blanked to obtain the first stator straight bar (2), and enters into the blanking die (10); the first blanking punch (6) for punching the first stator straight bar (2) comprises a plurality of yoke (2.1) blanking areas and a tooth (2.2) blanking area connected to the yoke (2.1) blanking area, and the two ends of the yoke (2.1) blanking area are respectively provided with a connecting protrusion (6.3) and a connecting groove (6.4); Step 5, blanking the second stator straight bar: in the process of feeding the material strip (1) forward, the material strip (1) where the characteristic hole is punched out in step S3 is blanked to obtain the second stator straight bar (3), and enters the blanking die (10); the outer contour shape of the second blanking punch (7) used for punching the second stator straight bar (3) is the same as the outer contour shape of the first blanking punch (6), and the second blanking punch (7) and the first blanking punch (6) are arranged opposite to each other and staggered; Step 6, cutting off the waste: During the process of feeding the material belt (1) forward, after the first stator straight bar (2) and the second stator straight bar (3) are cut off, waste (1.5) is obtained, and the waste (1.5) is cut off.

2. A material-saving stamping manufacturing process for a straight-bar wound round iron core according to claim 1, characterized in that: In step 2, during the forward feeding of the material strip (1), when the first guide hole (1.1) is formed after each step, a second guide hole (1.2) is punched out in the middle of the material strip (1).

3. The manufacturing process of a straight bar wound round iron core by material-saving stamping according to claim 1 is characterized in that: In step 3, the steps for punching out the feature hole are as follows: Step 301: Punching out first contour notches: During the process of feeding the material strip (1) forward, punching out a plurality of first contour notches (2.4) in an area on one side of the yoke (2.1) of the first stator straight bar (2) away from the tooth portion (2.2); Step 302: Punching out a first triangular notch: in the process of feeding the material strip (1) forward, punching out a first triangular notch (2.5) in a region on one side of the yoke (2.1) of the first stator straight bar (2) close to the tooth portion (2.2); Step 303: Punching out second shape notches: During the process of feeding the material strip (1) forward, punching out a plurality of second shape notches (3.1) in the area on one side of the yoke (2.1) of the second stator straight bar (3) away from the tooth portion (2.2); Step 304: Punching out a second triangular notch: During the process of feeding the material strip (1) forward, punching out a second triangular notch (3.2) in a region on one side of the yoke (2.1) of the second stator straight bar (3) close to the tooth portion (2.2); Step 305: Punching out the first buckle point: punching out the first buckle point (2.6) or the first through-hole (2.7) in the yoke (2.1) and tooth (2.2) regions of the first stator straight bar (2) during the forward feeding of the material strip (1); Step 306: Punching out the second buckle point: During the forward feeding process of the material strip (1), a second buckle point (3.3) or a second through-hole (3.4) is punched out in the yoke (2.1) and tooth (2.2) regions of the second stator straight bar (3).

4. The manufacturing process of a straight bar wound round iron core by material-saving stamping according to claim 1 is characterized in that: The outer contour line of the inner hole portion (2.3) of the preformed second stator straight bar (3) abuts against the inner contour line of the yoke portion (2.1) of the first stator straight bar (2), and the side contour line of the inner hole portion (2.3) of the second stator straight bar (3) abuts against the side contour line of the tooth portion (2.2) of the first stator straight bar (2); in step 3, the steps of punching out the characteristic hole are as follows: Step 311: Punching out process circular holes: in the process of feeding the material strip (1) forward, a plurality of first process circular holes (2.8) are punched out in the yoke (2.1) region of the first stator straight bar (2), and a plurality of second process circular holes (3.5) are punched out in the yoke (2.1) region of the second stator straight bar (3); Step 312: Punching out the first buckle point: punching out the first buckle point (2.6) or the first through-hole (2.7) in the yoke (2.1) and tooth (2.2) regions of the first stator straight bar (2) during the forward feeding of the material strip (1); Step 313: Punching out a second buckle point: punching out a second buckle point (3.3) or a second through-hole (3.4) in the yoke (2.1) and tooth (2.2) regions of the second stator straight bar (3) during the forward feeding of the material strip (1); Step 314: Punching out a first splicing hole: in the process of feeding the material strip (1) forward, a first splicing hole (2.10) is punched out on the right side of the first process circular hole (2.8) in the upper yoke (2.1) area of ​​the first stator straight bar (2) by a first splicing punch (2.9); Step 315: Punching out a second splicing hole: in the process of feeding the material strip (1) forward, a second splicing hole (3.7) is punched out on the left side of the second process circular hole (3.5) in the upper yoke (2.1) area of ​​the second stator straight bar (3) by a second splicing punch (3.6); Step 316: Punching out slot-shaped holes: During the process of feeding the material strip (1) forward, a slot-shaped hole (1.3) is punched out between the tooth portion (2.2) of the first stator straight bar (2) and the tooth portion (2.2) of the second stator straight bar (3).

5. The manufacturing process of a straight bar wound round iron core by material-saving stamping according to claim 3 is characterized in that: In step 305 and step 306, a draw plate is provided below the material strip (1), and the relative position between the punch and the draw plate is changed to form a first buckle point (2.6) or a first through-piece hole (2.7) and a second buckle point (3.3) or a second through-piece hole (3.4) on the material strip (1).

6. The manufacturing process of a straight bar wound round iron core by material-saving stamping according to claim 4 is characterized in that: In step 312 and step 313, a draw plate is provided below the material strip (1), and the relative position between the punch and the draw plate is changed to form a first buckle point (2.6) or a first through-piece hole (2.7) and a second buckle point (3.3) or a second through-piece hole (3.4) on the material strip (1).

7. The manufacturing process of a straight bar wound round iron core by material-saving stamping according to claim 1, characterized in that: In step 4, a first blanking locking structure (8) is arranged in the blanking die (10), and the first blanking locking structure (8) includes a first limiting column (8.1), a second limiting column (8.2), a third limiting column (8.3) and a fourth limiting column (8.4), the first limiting column (8.1) abuts against the yoke (2.1) of the first stator straight bar (2), the second limiting column (8.2) and the third limiting column (8.3) abut against both sides of the tooth portion (2.2) of the first stator straight bar (2), and the fourth limiting column (8.4) abuts against the inner hole portion (2.3) of the first stator straight bar (2).

8. The process for manufacturing a straight bar wound round iron core by stamping to save material according to claim 1, characterized in that: In step 5, a second blanking locking mechanism is arranged in the blanking die (10), and the second blanking locking structure (9) includes a fifth limiting column (9.1), a sixth limiting column (9.2) and a seventh limiting column (9.3), the fifth limiting column (9.1) and the sixth limiting column (9.2) abut against both sides of the tooth portion (2.2) of the second stator straight bar (3), and the seventh limiting column (9.3) abuts against the inner hole portion (2.3) of the second stator straight bar (3).

9. The process for manufacturing a straight bar wound round iron core by stamping to save material according to claim 1, characterized in that: Before step 4, there is a step of punching the first guide nail. During the process of stepping the strip forward, the first guide nail is punched at the first guide hole (1.1) after each step. Before step 5, there is a step of punching the second guide nail. During the process of stepping the strip forward, the second guide nail is punched at the second guide hole (1.2) after each step.

10. The material-saving stamping manufacturing process of a straight-bar wound round iron core according to claim 1 is characterized in that: In step 4 and step 5, the outer contour shape of the first blanking punch (6) is the same as the outer contour shape of the formed first stator straight bar (2), and the outer contour shape of the second blanking punch (7) is the same as the outer contour shape of the formed second stator straight bar (3).

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