Iron core stamping die

Abstract

According to the iron core stamping die, the pressing rod assemblies are in press fit with the first press-fit face and the second press-fit face arranged on the lower end face of the pulling plate, and due to the fact that the height difference exists between the first press-fit face and the second press-fit face, two kinds of stretching heights of the pressing rod assemblies are formed; at the first stretching height, the buckle point pressing head presses a buckle point sunken towards the interior of the blanking hole on the metal material strap, and at the second stretching height, the punch penetrates through the metal material strap to form a penetrating through hole, so that the tedious operation of using two dies or replacing the punch in the production process is avoided, and the floating nail is driven by the ejection mechanism to be ejected upwards; a floating nail is arranged in the first blanking hole, a metal strip is clamped in the convex point part in the first blanking hole and jacked up, a shifting rod sliding up and down is arranged between the first blanking hole and the second blanking hole in the lower die base, the shifting rod slides up and down along with the floating nail, and in the falling process of waste, the end of the shifting rod collides with the waste to enable the waste to rotate clockwise. And falling in the horizontal direction is converted into clockwise inclined falling.

Description

Technical Field

[0001] The utility model relates to the field of stamping dies, in particular to an iron core stamping die. Background Art

[0002] The bumps on the core refer to the protruding structures formed on the core laminations. The main functions of the bumps include helping to align and position the laminations during assembly, enhancing the mechanical strength of the core, preventing lamination displacement, and optimizing the magnetic flux path to improve the magnetic properties of the core. However, in order to keep the upper and lower end surfaces of the core laminations flat, the common core laminations have through holes at the bottom of the core laminations. When producing core laminations, two stamping dies are required or the punches are replaced during production. Both methods are very time-consuming in actual operation. A stamping die that can stamp both convex and through-hole cores on a set of dies is required. When punching through holes, in order to ensure the size of the through holes, the blanking holes often cannot have too large a gap, and the taper cannot be too large, which will cause the blanking holes to crack easily. Therefore, when the edge of the scrap is not far from the gap in the blanking hole, the scrap has a large contact area or opportunity with the blanking hole wall horizontally downward, so it is easy to get stuck. Summary of the invention

[0003] The problem to be solved by the utility model is to provide an iron core stamping die, which can complete the stamping of convex points and through holes on a set of dies at the same time, avoiding the cumbersome operation of using two dies or replacing punches during the production process, and solving the problem that the waste material has a large contact area or contact points with the blanking hole wall when it is horizontally downward.

[0004] The technical solution adopted by the utility model to solve the above problems is: an iron core stamping die, comprising an upper die seat, a lower die seat and a metal strip arranged between the upper die seat and the lower die seat, the lower die seat is provided with a lower die insert, a lower model core and a lower die pad, the lower die insert is embedded in the lower model core, the lower model core is fixed on the lower die pad, a first blanking hole is provided at the center of the lower die insert, mounting holes and an ejection mechanism are provided on both sides of the first blanking hole on the lower model core, a floating pin is slidably inserted in the mounting hole along the mold opening direction, the ejection mechanism drives the floating pin to slide up and down, a second blanking hole that penetrates up and down and is coaxial with the first blanking hole is provided on the lower die pad, the diameter of the second blanking hole is consistent with the diameter of the lower end of the first blanking hole, and a shift rod is provided at the upper edge of the second blanking hole, one end of the shift rod is fixedly connected to one of the floating pins, and the other end is inserted into the second blanking hole along the radial direction of the second blanking hole and moves up and down with the movement of the floating pin;

[0005] The upper die seat includes a pressure rod assembly, a draw plate, and a bottom plate, which are arranged in sequence from bottom to top along the mold closing direction, and the pressure rod assembly is abutted against the lower end surface of the draw plate and the bottom plate in sequence from bottom to top along the mold closing direction. The pressure rod assembly includes a punch and a buckle point pressure head arranged at one end of the blanking hole where the punch points to the punch. The lower end surface of the draw plate includes a first pressing surface, a second pressing surface, and a transition surface. The first pressing surface is lower than the second pressing surface in the mold closing direction. The draw plate can reciprocate and translate in a horizontal direction in the upper die seat, so that the pressure rod assembly can abut against the second pressing surface from the first pressing surface through the transition surface or the pressure rod assembly can abut against the first pressing surface from the second pressing surface through the transition surface. When the pressure rod assembly abuts against the second pressing surface, the buckle point pressure head presses the metal strip to form a buckle point recessed in the blanking hole. When the pressure rod assembly abuts against the first pressing surface, the punch passes through the metal strip to form a through hole.

[0006] Compared with the prior art, an iron core stamping die is pressed with the first pressing surface and the second pressing surface arranged on the lower end surface of the draw plate through a pressing rod assembly. Due to the height difference between the first pressing surface and the second pressing surface, two extension heights of the pressing rod assembly are formed. At the first extension height, the buckle point pressure head presses the buckle point on the metal strip to be recessed into the blanking hole. At the second extension height, the punch passes through the metal strip to form a through hole, so as to realize the simultaneous stamping of two iron core sheets with convex points and through hole components, respectively, avoiding the tedious operation of using two molds or replacing the punch during the production process. This design greatly improves production efficiency and reduces the time and cost of production mold change. The floating pin is driven upward by the ejection mechanism to eject the metal strip stuck in the first blanking hole. The convex part is lifted up to prevent the convex point from colliding with the edge of the blanking hole during material transfer, thereby improving the appearance of the product. A lever that slides up and down is provided between the first blanking hole and the second blanking hole on the lower die seat. The lever slides up and down with the floating pin. During the falling process of the waste material, the end of the lever will collide with the waste material to make the waste material rotate clockwise, and change from falling horizontally to falling obliquely clockwise, so as to reduce the contact between the side wall of the waste material and the side wall of the blanking hole, thereby reducing the occurrence of waste material being stuck in the blanking hole.

[0007] Preferably, the first blanking hole is a tapered hole that is larger at the bottom and smaller at the top, and has a taper of 4 to 5'. The setting of the taper can facilitate the discharge of waste from the through hole from the blanking port.

[0008] Preferably, the ejection mechanism includes a limiting hole located on the lower mold pad and coaxial with the mounting hole, the floating pin has a push rod and a limiting portion, the push rod is inserted in the mounting hole, the limiting portion is installed in the limiting hole, the aperture of the limiting hole is larger than the mounting hole, and a limiting surface is formed on the lower end surface of the lower mold core at the connection between the limiting hole and the mounting hole, the upper end surface of the limiting portion is against the limiting surface, and an elastic member is also provided in the limiting hole, and a member fixedly connected to the sealing structure is provided below the elastic member to abut the lower end surface of the elastic member.

[0009] Preferably, the blocking structure includes a plug and a blocking block arranged in the limiting hole, the plug is threadedly connected and fixed to the bottom of the limiting hole, one end of the blocking block abuts against the plug, and the other end abuts against the lower end of the elastic member.

[0010] Preferably, the elastic member is a spring.

[0011] Preferably, the pressure rod assembly also includes an extension rod and a pressure rod, the punch is arranged at one end of the pressure rod pointing to the blanking hole, the head of the extension rod is abutted against the other end of the pressure rod, the end face of the tail of the extension rod can be abutted against the first pressing surface or the second pressing surface of the draw plate, and the edge of the end face is provided with an inclination angle consistent with the transition surface. The setting of the bevel angle can make the movement process of the extension rod from the first pressing surface through the transition surface to the second pressing surface or from the second pressing surface through the transition surface to the first pressing surface smoother, thereby reducing the wear of the extension rod, and the separate setting of the extension rod and the pressure rod facilitates replacement and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the utility model when the pressure rod assembly abuts against the second pressing surface;

[0013] Figure 2 It is a cross-sectional view of the blanking hole, the punch, and the metal strip when the pressure rod assembly of the utility model abuts against the second pressing surface;

[0014] Figure 3 It is a cross-sectional view of the utility model when the pressure rod assembly abuts against the first pressing surface;

[0015] Figure 4 It is a cross-sectional view of the blanking hole, the punch, and the metal strip when the pressure rod assembly of the utility model abuts against the first pressing surface;

[0016] Figure 5 It is a partial cross-sectional view of the lever of the utility model when it is at the lowest end;

[0017] Figure 6 It is a partial cross-sectional view of the lever of the utility model when it is at the uppermost end;

[0018] Illustration: 1. Upper die base; 1.1. Pressure rod assembly; 1.1.1. Extension rod; 1.1.11. Bevel; 1.1.2. Pressure rod; 1.1.21. Punch; 1.1.22. Buckle point press head; 1.2. Plate drawer; 1.2.1. First pressing surface; 1.2.2. Second pressing surface; 1.2.3. Transition surface; 1.3. Bottom plate; 2. Metal strip; 2.1. Buckle point; 3. Lower die base; 3.1. Lower die insert; 3.1.1. First Blanking hole; 3.1.2, floating pin; 3.1.21, ejector rod; 3.1.22, limiting part; 3.2, lower model core; 3.2.1, mounting hole; 3.2.2, ejection mechanism; 3.2.21, limiting hole; 3.2.3, limiting surface; 3.2.4, elastic part; 3.2.5, blocking structure; 3.2.51, plug; 3.2.52, blocking block; 3.3, lower die pad; 3.3.1, second blanking hole; 3.4, lever. DETAILED DESCRIPTION

[0019] Before describing in detail any embodiment of the utility model, it should be understood that the utility model is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The utility model 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.

[0020] Furthermore, on the first aspect, in the disclosure of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position 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.

[0021] 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 functions 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.

[0022] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0023] Please refer to Figures 1 to 4 A core stamping die comprises an upper die base 1, a lower die base 3 and a metal strip 2 arranged between the upper die base 1 and the lower die base 3. The lower die base 3 is provided with a lower die insert 3.1, a lower mold core 3.2 and a lower die pad 3.3. The lower die insert 3.1 is embedded in the lower mold core 3.2. The lower mold core 3.2 is fixed on the lower mold pad 3.3. A first blanking hole 3.1.1 is arranged at the center of the lower die insert 3.1. The first blanking hole 3.1.1 is a tapered hole with a larger bottom and a smaller top, and a taper of 4 to 5'. The lower mold core 3.2 is provided with mounting holes 3.2.1 and an ejection mechanism 3.2.2 on both sides of the first blanking hole 3.1.1. A floating pin 3.1.2 is inserted and slidably inserted in the mounting hole 3.2.1 along the mold opening direction.

[0024] The ejection mechanism 3.2.2 drives the floating pin 3.1.2 to slide up and down. The ejection mechanism 3.2.2 specifically includes a limiting hole 3.2.21 coaxial with the mounting hole 3.2.1, which is located on the lower die pad 3.3 and directly below the mounting hole 3.2.1. The floating pin 3.1.2 has a push rod 3.1.21 and a limiting part 3.1.22. The push rod 3.1.21 is inserted into the mounting hole 3.2.1, and the limiting part 3.1.22 is installed in the limiting hole 3.2. 21, the aperture of the limiting hole 3.2.21 is larger than the mounting hole 3.2.1, and the connection between the limiting hole 3.2.21 and the mounting hole 3.2.1 forms a limiting surface 3.2.3, the upper end surface of the limiting portion 3.1.22 abuts against the limiting surface 3.2.3, and an elastic member 3.2.4 is also provided in the limiting hole 3.2.21, and a member fixedly connected to the blocking structure 3.2.5 is provided below the elastic member 3.2.4 to abut the lower end surface of the elastic member 3.2.4,

[0025] The blocking structure 3.2.5 includes a plug 3.2.51 and a blocking block 3.2.52 arranged in the limiting hole 3.2.21. The plug 3.2.51 is threadedly connected and fixed at the bottom of the limiting hole 3.2.21. One end of the blocking block 3.2.52 abuts against the plug 3.2.51, and the other end abuts against the lower end of the elastic member 3.2.4, which is a spring.

[0026] A second blanking hole 3.3.1 is provided at the lower die pad 3.3, which passes through from top to bottom and is coaxial with the first blanking hole 3.1.1. The diameter of the second blanking hole 3.3.1 is consistent with the diameter of the lower end of the first blanking hole 3.1.1, and a lever 3.4 is provided at the upper edge of the second blanking hole 3.3.1. One end of the lever 3.4 is fixedly connected to a floating pin 3.1.2 on the left, and the other end is inserted into the second blanking hole 3.3.1 along the radial direction of the second blanking hole 3.3.1 and moves up and down with the movement of the floating pin 3.1.2;

[0027] The upper die base 1 includes a pressure rod assembly 1.1, a draw plate 1.2, and a bottom plate 1.3, which are arranged in sequence from bottom to top along the mold closing direction. The pressure rod assembly 1.1 is abutted against the lower end surface of the draw plate 1.2 and the bottom plate 1.3 in sequence from bottom to top along the mold closing direction. The pressure rod assembly 1.1 includes a punch 1.1.21, and a buckle point press head 1.1.22 arranged at one end of the punch 1.1.21 pointing to the blanking hole. The lower end surface of the draw plate 1.2 includes a first pressing surface 1 .2.1, the second pressing surface 1.2.2, and the transition surface 1.2.3. The first pressing surface 1.2.1 is lower than the second pressing surface 1.2.2 in the mold closing direction. The draw plate 1.2 can reciprocate in a horizontal direction in the upper mold base 1, so that the pressure rod assembly 1.1 passes from the first pressing surface 1.2.1 through the transition surface 1.2.3 and abuts against the second pressing surface 1.2.2, or the pressure rod assembly 1.1 passes from the second pressing surface 1.2.2 through the transition surface 1.2.3. When the cross surface 1.2.3 abuts against the first pressing surface 1.2.1, and the pressure rod assembly 1.1 abuts against the second pressing surface 1.2.2, the buckle point pressure head 1.1.22 presses on the metal strip 2 to form a buckle point 2.1 that is recessed into the blanking hole. When the pressure rod assembly 1.1 abuts against the first pressing surface 1.2.1, the punch 1.1.21 passes through the metal strip 2 to form a through hole. The pressure rod assembly 1.1 also includes an extension rod 1.1.1, a pressure rod 1.2.2, and a pressure rod 1.2.3. Rod 1.1.2, punch 1.1.21 is arranged at one end of the pressure rod 1.1.2 pointing to the blanking hole, the head of the extension rod 1.1.1 is against the other end of the pressure rod 1.1.2, the end face of the tail of the extension rod 1.1.1 can be against the first pressing surface 1.2.1 or the second pressing surface 1.2.2 of the draw plate 1.2, and the edge of the end face is provided with an inclination angle 1.1.11 degrees consistent with the transition surface 1.2.3.

[0028] The above description is only for the best embodiment of the utility model, but it cannot be understood as a limitation of the claims. The utility model is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the protection scope of the independent claims of the utility model are within the protection scope of the utility model.

Claims

1. An iron core stamping die, comprising an upper die base (1), a lower die base (3) and a metal strip (2) arranged between the upper die base (1) and the lower die base (3), characterized in that: The lower die base (3) is provided with a lower die insert (3.1), a lower mold core (3.2), and a lower die pad (3.3); the lower die insert (3.1) is embedded in the lower mold core (3.2); the lower mold core (3.2) is fixed on the lower die pad (3.3); a first blanking hole (3.1.1) is provided at the center of the lower die insert (3.1); mounting holes (3.2.1) and an ejection mechanism (3.2.2) are provided on both sides of the first blanking hole (3.1.1) on the lower mold core (3.2); a floating pin (3.1.2) is slidably inserted in the mounting hole (3.2.1) along the mold opening direction; the ejection mechanism (3. 2.2) drives the floating pin (3.1.2) to slide up and down, and the lower die pad (3.3) is provided with a second blanking hole (3.3.1) which penetrates up and down and is coaxial with the first blanking hole (3.1.1), the diameter of the second blanking hole (3.3.1) is consistent with the diameter of the lower end of the first blanking hole (3.1.1), and a lever (3.4) is provided at the upper edge of the second blanking hole (3.3.1), one end of the lever (3.4) is fixedly connected to one of the floating pins (3.1.2), and the other end is inserted into the second blanking hole (3.3.1) along the radial direction of the second blanking hole (3.3.1) and moves up and down with the movement of the floating pin (3.1.2); The upper die seat (1) comprises a pressure rod assembly (1.1), a draw plate (1.2), and a bottom plate (1.3) which are arranged in sequence from bottom to top along the mold closing direction; the pressure rod assembly (1.1) abuts against the lower end surface of the draw plate (1.2) and the bottom plate (1.3) in sequence from bottom to top along the mold closing direction; the pressure rod assembly (1.1) comprises a punch (1.1.21) and a buckle point pressure head (1.1.22) arranged at one end of the blanking hole where the punch (1.1.21) points; the lower end surface of the draw plate (1.2) comprises a first pressing surface (1.2.1), a second pressing surface (1.2.2), and a transition surface (1.2.3); the first pressing surface (1.2.1) is lower than the second pressing surface (1.2.2) in the mold closing direction; the draw plate (1.2) The upper die seat (1) can be reciprocated and translated in a horizontal direction, so that the pressure rod assembly (1.1) can be pushed against the second pressing surface (1.2.2) from the first pressing surface (1.2.1) through the transition surface (1.2.3), or the pressure rod assembly (1.1) can be pushed against the first pressing surface (1.2.1) from the second pressing surface (1.2.2) through the transition surface (1.2.3). When the pressure rod assembly (1.1) is pushed against the second pressing surface (1.2.2), the buckle point pressing head (1.1.22) presses on the metal strip (2) to form a buckle point (2.1) that is recessed into the blanking hole. When the pressure rod assembly (1.1) is pushed against the first pressing surface (1.2.1), the punch (1.1.21) passes through the metal strip (2) to form a through hole.

2. The iron core stamping die according to claim 1, characterized in that: The first blanking hole (3.1.1) is a tapered hole that is larger at the bottom and smaller at the top, and has a taper of 4 to 5'.

3. The iron core stamping die according to claim 1, characterized in that: The ejection mechanism (3.2.2) comprises a limiting hole (3.2.21) located on the lower die pad (3.3) and coaxial with the mounting hole (3.2.1); the floating pin (3.1.2) comprises a push rod (3.1.21) and a limiting portion (3.1.22); the push rod (3.1.21) is inserted into the mounting hole (3.2.1); the limiting portion (3.1.22) is installed in the limiting hole (3.2.21); the aperture of the limiting hole (3.2.21) is larger than that of the mounting hole (3.2 .1), a limiting surface (3.2.3) is formed on the lower end surface of the lower model core (3.2) at the connection between the limiting hole (3.2.21) and the mounting hole (3.2.1), the upper end surface of the limiting portion (3.1.22) is against the limiting surface (3.2.3), and an elastic member (3.2.4) is also provided in the limiting hole (3.2.21), and a member fixedly connected to the blocking structure (3.2.5) is provided below the elastic member (3.2.4) for abutting the lower end surface of the elastic member (3.2.4).

4. The iron core stamping die according to claim 3, characterized in that: The blocking structure (3.2.5) comprises a plug (3.2.51) and a blocking block (3.2.52) arranged in the limiting hole (3.2.21); the plug (3.2.51) is threadedly connected and fixed at the bottom of the limiting hole (3.2.21); one end of the blocking block (3.2.52) abuts against the plug (3.2.51) and the other end abuts against the lower end of the elastic member (3.2.4).

5. The iron core stamping die according to claim 3 or 4, characterized in that: The elastic member (3.2.4) is a spring.

6. The iron core stamping die according to claim 1, characterized in that: The pressure rod assembly (1.1) further comprises an extension rod (1.1.1) and a pressure rod (1.1.2); the punch (1.1.21) is arranged at one end of the pressure rod (1.1.2) pointing to the blanking hole; the head of the extension rod (1.1.1) abuts against the other end of the pressure rod (1.1.2); the end face of the tail of the extension rod (1.1.1) can abut against the first pressing surface (1.2.1) or the second pressing surface (1.2.2) of the draw plate (1.2); and the edge of the end face is provided with an inclination angle (1.1.11) of degrees that is consistent with the inclination angle (1.1.11) of the transition surface (1.2.3).

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