Inner diameter forming method of stator iron core sheet

Abstract

According to the inner diameter forming method of the stator iron core piece, the part, provided with a plurality of groove-shaped holes formed in an annular array mode, of a material body is moved to the position below a punch of a continuous blanking die, so that the inner end parts of the groove-shaped holes formed in the material body in the annular array mode correspond to the edge position of the lower end of the punch of the continuous blanking die; at least one waste anti-jumping group is arranged on a concave die, which is coaxial with the punch, on the continuous blanking die, and comprises two anti-jumping grooves which are oppositely and obliquely arranged; a punch of a continuous blanking die is close to a female die, so that the punch carries out blanking along the inner end parts of a plurality of groove-shaped holes which are formed in an annular array on a material body to form the stator inner diameter and inner diameter waste materials with a plurality of convex points, and the convex points on the inner diameter waste materials are embedded into the anti-jumping grooves respectively. Therefore, the situation that the punching head moves upwards along with the punching head is avoided, punching is reliable, production efficiency is improved, and production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of inner diameter forming of motor stator iron core sheets, in particular to an inner diameter forming method of a stator iron core sheet. Background Art

[0002] The stator core is formed into a stator core for a motor after being stacked and connected in multiple pieces, and is assembled with the rotor core to form a motor. In the prior art, each stator core is formed by progressively punching a silicon steel strip through a progressive die, and falls into a blanking channel for stacking and connection. However, when the inner diameter of the stator core is punched and formed on the silicon steel strip, inner diameter waste is generated. However, the inner diameter waste needs to fall and be output from the waste channel according to production requirements. However, since the upper surface of the silicon steel strip is coated with stamping oil during punching, the upper surface of the inner diameter waste formed after the punch punches to form the inner diameter of the stator is in contact with the lower end face of the punch, which leads to the mutual adsorption of the upper surface of the inner diameter waste and the lower end face of the punch. When the punch moves up, the inner diameter waste moves up with it. However, this situation will cause the following technical problems:

[0003] 1) When the punch punches down again, the inner diameter scrap adhered to the punch will be displaced and deflected after contacting the silicon steel strip, resulting in blanking failure and direct damage to the silicon steel strip, or the inner diameter of the punched stator is irregular or deflected.

[0004] 2) When the punch moves up, the inner diameter scrap will move up a distance with it, and then the inner diameter scrap will automatically fall to the upper surface of the part of the silicon steel strip where the inner diameter of the stator is about to be formed. Therefore, when the punch rushes down again, the fallen inner diameter scrap and the part of the silicon steel strip where the inner diameter of the stator is about to be formed will be punched at the same time, resulting in punching failure and direct damage to the silicon steel strip.

[0005] 3) When the above technical problem 1) or technical problem 2) occurs, each forming feature punched out on the silicon steel strip before forming the stator inner diameter cannot be used as a forming basis again. Therefore, it is necessary to cut all the parts on the silicon steel strip that cannot be used as a forming basis again. After the cutting is completed, the benchmark debugging and punching must be performed again. Since the stator inner diameter is generally formed close to the stator iron chip blanking station, the cutting area is large, resulting in serious material waste, and re-debugging requires a lot of time, resulting in a significant decrease in work efficiency.

[0006] Therefore, the inventors have developed a method for forming the inner diameter of a stator core sheet that can overcome the above-mentioned defects. Summary of the invention

[0007] The present invention is a method for forming the inner diameter of a stator core sheet designed to solve the above technical problems.

[0008] A method for forming the inner diameter of a stator core sheet designed by the present invention comprises the following steps: The part of the material body having a plurality of annular array slotted holes is moved to below the punch of the continuous punching die, so that the inner end parts of the plurality of annular array slotted holes on the material body correspond to the lower edge positions of the punch of the continuous punching die, and at least one set of waste material anti-jumping group is arranged on the concave die coaxially arranged with the punch on the continuous punching die, and the waste material anti-jumping group includes two anti-jumping grooves arranged relatively obliquely, each anti-jumping groove is arranged on the inner wall of the die hole of the concave die on the continuous punching die, and respectively corresponds to the inner end part of the tooth portion between each two adjacent slotted holes on the material body; The punch and die of the continuous blanking die are brought close to each other so that the punch is blanked along the inner end of multiple grooved holes arranged in a circular array on the material body to form the stator inner diameter and the inner diameter waste with multiple convex points, and the convex points on the inner diameter waste are respectively embedded in each anti-jump groove to lock the inner diameter waste by relatively tilting the anti-jump groove.

[0009] According to the inner diameter forming method of a stator iron core sheet described above, after continuous inner diameter scraps are formed, they are stacked in the die hole of the die, and the convex points of each inner diameter scrap are embedded in the anti-jump groove, and the spacing between two relatively inclined anti-jump grooves gradually decreases from one end to the other end, so that the locking force of the inner diameter scrap located at the bottom of the die hole is greater than the locking force of the inner diameter scrap located in the middle of the die hole, and the locking force of the inner diameter scrap located in the middle of the die hole is greater than the locking force of the inner diameter scrap located at the top of the die hole.

[0010] According to the inner diameter forming method of a stator iron core sheet described above, the number of the waste anti-jumping groups is set to be multiple groups, and the multiple groups of waste anti-jumping groups are distributed in a ring array in the die hole of the concave die.

[0011] According to the above-mentioned method for forming the inner diameter of a stator core sheet, the inclination angle of each anti-jumping slot ranges from 4° to 8°.

[0012] According to the inner diameter forming method of a stator core sheet described above, the maximum spacing between two relatively inclined anti-jumping grooves in each scrap anti-jumping group is in the range of 50 mm to 80 mm.

[0013] According to the above-mentioned inner diameter forming method of a stator core sheet, the depth of each anti-jumping groove on the inner wall of the die hole of the concave die ranges from 0.01 mm to 0.025 mm.

[0014] According to the above-mentioned inner diameter forming method of a stator core sheet, each anti-jumping groove extends from the upper end surface of the die to the lower end surface on the inner wall of the die hole of the die, so that each anti-jumping groove is arranged through.

[0015] According to the above-mentioned method for forming the inner diameter of a stator core sheet, the width of each anti-jumping groove on the inner wall of the die hole of the concave die is in the range of 0.15 mm to 0.25 mm.

[0016] According to the above-mentioned inner diameter forming method of a stator core sheet, the outer wall surface of each protrusion on the outer periphery of the inner diameter scrap is an arc surface.

[0017] According to the above-mentioned method for forming the inner diameter of a stator core sheet, the inner wall surface of each anti-jumping groove is an arc surface.

[0018] The present invention is a method for forming the inner diameter of a stator iron core sheet, which utilizes the relatively inclined arrangement of two anti-jump grooves of each group of waste anti-jump groups so that each convex point on the formed inner diameter waste is respectively positioned in the two anti-jump grooves of each group of waste anti-jump groups, so as to achieve the inner diameter waste being locked in the die hole after punching and forming, avoiding the situation of being moved up by the punch, thereby making the punching reliable, improving the production efficiency and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the die (I).

[0020] Figure 2 It is a schematic diagram of the structure of the die (II).

[0021] Figure 3 It is a structural diagram of inner diameter waste.

[0022] Figure 4 It is a structural diagram of anti-tank jumping.

[0023] Figure 5 It is a schematic diagram of the stator iron core structure.

[0024] In the figure: 1, die; 10, waste anti-jump group; 11, die hole; 12, anti-jump groove; 2, inner diameter waste; 21, convex point; a, tilt angle; b, depth; c, width. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0026] Example: like Figure 1-Figure 5 As shown, the inner diameter forming method of a stator core sheet described in this embodiment includes the following steps: The part of the material body with multiple grooved holes arranged in an annular array is moved to the bottom of the punch of the continuous punching die, so that the inner end parts of the multiple grooved holes arranged in an annular array on the material body correspond to the lower end edge position of the punch of the continuous punching die, and at least one group of waste anti-jumping groups 10 are arranged on the die 1 coaxially arranged with the punch on the continuous punching die, and the waste anti-jumping group 10 includes two relatively inclined anti-jumping grooves 12, each of which is arranged on the inner wall of the die hole 11 of the die 1 on the continuous punching die, and corresponds to the inner end part of the tooth part between each adjacent two grooved holes on the material body; wherein one of the two relatively inclined anti-jumping grooves 12 is inclined to the left and the other is inclined to the right, the material body adopts a silicon steel strip, and the die hole 11, the inner diameter waste 2 and the punch are all circular.

[0027] The punch of the continuous punching die is brought close to the die 1 so that the punch is punched along the inner end of the slotted holes arranged in a plurality of annular arrays on the material body to form the inner diameter of the stator and the inner diameter waste material 2 with a plurality of convex points 21, and each convex point 21 on the inner diameter waste material 2 is respectively embedded in each anti-jumping groove 12, so as to lock the inner diameter waste material 2 by relatively tilting the anti-jumping groove 12, and the inner diameter of the stator refers to the distance between each two teeth located beside the slotted hole and symmetrically arranged; wherein the outer wall surface of each convex point 21 on the outer periphery of the inner diameter waste material 2 is an arc surface, to adapt to the shape of the convex point 21, the inner wall surface of each anti-jumping groove 12 is also an arc surface, the transverse thickness of each convex point 21 is 0.01mm-0.025mm, and its length is 0.15mm-0.25mm.

[0028] Furthermore, after continuous inner diameter waste materials 2 are formed, they are stacked in the die hole 11 of the die 1, and the protrusion 21 of each inner diameter waste material 2 is embedded in the anti-jump groove 12, and the distance between the two relatively inclined anti-jump grooves 12 gradually decreases from one end to the other end, so that the locking force of the inner diameter waste material 2 located at the bottom of the die hole 11 is greater than the locking force of the inner diameter waste material 2 located in the middle of the die hole 11, and the locking force of the inner diameter waste material 2 located in the middle of the die hole 11 is greater than the locking force of the inner diameter waste material 2 located at the top of the die hole 11.

[0029] Preferably, the number of the waste anti-jumping groups 10 is set to be multiple groups, and the multiple groups of waste anti-jumping groups 10 are distributed in a ring array in the die hole 11 of the die 1, and the arrangement makes the locking of the inner diameter waste 2 more stable and reliable. Among them, the orthographic projection shape of the spacing between the two anti-jumping grooves 12 of each group of waste anti-jumping groups 10 is conical, so the conical spacing between each two adjacent groups of waste anti-jumping groups 10 is oppositely arranged.

[0030] In the present embodiment, since one of the two anti-jump grooves 12 inclined relatively to each other is inclined to the left and the other is inclined to the right, the inclination angle a of the anti-jump groove 12 inclined to the left and the anti-jump groove 12 inclined to the right is in the range of 4°-8°, and the inclination angle a is preferably 7°, wherein the inclination angle a is set relative to the axis of symmetry between the two symmetrically arranged anti-jump grooves 12.

[0031] In the present embodiment, each anti-jump groove 12 extends from the upper end face of the die 1 to the lower end face thereof on the inner wall of the die hole 11 of the die 1, so that each anti-jump groove 12 is arranged through, so that the inner diameter waste material 2 can fall into the waste material channel below the die hole 11, and the depth b of each anti-jump groove 12 on the inner wall of the die hole 11 of the die 1 is in the range of 0.01 mm-0.025 mm, and the general depth b is preferably 0.02 mm; the width c of each anti-jump groove 12 on the inner wall of the die hole 11 of the die 1 is in the range of 0.15 mm-0.25 mm, and the general width c is preferably 0.2 mm.

[0032] Preferably, the maximum distance between two relatively inclined anti-jumping grooves 12 in each waste anti-jumping group 10 is in the range of 50 mm to 80 mm.

Claims

1. A method for forming the inner diameter of a stator core sheet, characterized in that: The steps include: The portion of the material body having a plurality of annularly arranged slotted holes is moved to below the punch of the continuous punching die, so that the inner end portions of the plurality of annularly arranged slotted holes on the material body correspond to the lower edge positions of the punch of the continuous punching die, and at least one set of waste material anti-jumping groups (10) is provided on a die (1) coaxially arranged with the punch on the continuous punching die, the waste material anti-jumping group (10) comprising two anti-jumping grooves (12) arranged relatively obliquely, each anti-jumping groove (12) being arranged on the inner wall of the die hole (11) of the die (1) on the continuous punching die, and corresponding to the inner end portions of the teeth between each two adjacent slotted holes on the material body; The punch and the die (1) of the continuous punching die are brought close to each other so that the punch performs punching along the inner end of a plurality of slot-shaped holes arranged in a ring array on a material body to form a stator inner diameter and an inner diameter scrap (2) with a plurality of convex points (21), and each convex point (21) on the inner diameter scrap (2) is respectively embedded in each anti-jumping groove (12) so that the inner diameter scrap (2) is locked by relatively tilting the anti-jumping groove (12).

2. The inner diameter forming method of a stator core sheet according to claim 1, characterized in that: After continuous inner diameter scraps (2) are formed, they are stacked in the die hole (11) of the concave die (1), and the convex point (21) of each inner diameter scrap (2) is embedded in the anti-jump groove (12), and the distance between two relatively inclined anti-jump grooves (12) gradually decreases from one end to the other end, so that the locking force of the inner diameter scrap (2) located at the bottom of the die hole (11) is greater than the locking force of the inner diameter scrap (2) located in the middle of the die hole (11), and the locking force of the inner diameter scrap (2) located in the middle of the die hole (11) is greater than the locking force of the inner diameter scrap (2) located at the top of the die hole (11).

3. The inner diameter forming method of a stator core sheet according to claim 2, characterized in that: The number of the waste material anti-jumping groups (10) is set to be multiple groups, and the multiple groups of waste material anti-jumping groups (10) are distributed in a ring array in the die hole (11) of the concave die (1).

4. A method for forming the inner diameter of a stator core sheet according to claim 1 or 3, characterized in that: The inclination angle (a) of each anti-jump groove (12) ranges from 4° to 8°.

5. The inner diameter forming method of a stator core sheet according to claim 1 or 3, characterized in that: The maximum distance between two anti-jumping grooves (12) arranged relatively obliquely in each waste anti-jumping group (10) is in the range of 50 mm to 80 mm.

6. A method for forming the inner diameter of a stator core sheet according to claim 1 or 3, characterized in that: The depth (b) of each anti-jump groove (12) on the inner wall of the die hole (11) of the concave die (1) ranges from 0.01 mm to 0.025 mm.

7. A method for forming the inner diameter of a stator core sheet according to claim 1 or 3, characterized in that: Each anti-jumping groove (12) extends from the upper end surface of the die (1) to the lower end surface on the inner wall of the die hole (11) of the die (1), so that each anti-jumping groove (12) is arranged through.

8. The inner diameter forming method of a stator core sheet according to claim 1 or 3, characterized in that: The width (c) of each anti-jump groove (12) on the inner wall of the die hole (11) of the concave die (1) is in the range of 0.15 mm to 0.25 mm.

9. The inner diameter forming method of a stator core sheet according to claim 1 or 3, characterized in that: The outer wall surface of each convex point (21) on the outer periphery of the inner diameter waste material (2) is an arc surface.

10. The inner diameter forming method of a stator core sheet according to claim 1 or 3, characterized in that: The inner wall surface of each anti-jump groove (12) is an arc surface.

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