Bending and cutting die for lead frame

Abstract

The utility model discloses a lead frame bending and cutting die, which belongs to the technical field of lead frame bending and cutting and comprises an upper die structure, the top surface of the upper die structure is fixedly connected with the output end of a punching machine, a lower die structure is arranged below the upper die structure, and the lower die structure is mounted on a frame of the punching machine; an upper guide structure is arranged at the corner of the bottom face of the upper die structure, a lower butt joint structure is arranged at the corner of the top face of the lower die structure, and the upper guide structure is slidably connected with the lower butt joint structure. A stamping structure is arranged in the middle of the inner side of the lower die working groove, and the plane of the stamping structure is higher than that of the lower die working groove; a cut-off structure is arranged on the inner side of the lower die working groove and located on the downstream of the running direction of the copper sheet. A traditional bending mode is broken through, the upper die is arranged to be the concave face, the lower die is arranged to be the convex face, silver plating is conducted firstly, then stamping is conducted, a silver plating face layer is in contact with the bottom face of the upper die structure, and the problem that a base conductor and a pin silver layer face are damaged by downward bending at the section position can be effectively solved in the stamping process.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead frame bending and cutting, and particularly relates to a lead frame bending and cutting die. Background Art

[0002] In the prior art, the silver-plated surface of the frame faces upward in the bending direction. When cutting the lead frame, it will bend downward at the cross-section, sometimes pressing and damaging the base conductor and the silver layer of the lead, affecting the wire bonding process during encapsulation and also causing functional impacts on the product. Therefore, a new lead frame bending and cutting die is needed to bend the lead frame upward at the cross-section, so as to solve the problem that bending downward at the cross-section will press and damage the base conductor and the silver layer of the lead, affecting the wire bonding process during encapsulation. Content of the Utility Model

[0003] The purpose of the utility model is to provide a lead frame bending and cutting die to solve the above problems.

[0004] To achieve the above purpose, the utility model provides the following solution:

[0005] A lead frame bending and cutting die, comprising: an upper die structure, the top surface of the upper die structure is fixedly connected to the output end of a stamping machine, a lower die structure is arranged below the upper die structure, and the lower die structure is installed on the frame of the stamping machine;

[0006] Upper guiding structures are arranged at the bottom corners of the upper die structure, lower docking structures are arranged at the top corners of the lower die structure, and the upper guiding structures are slidably connected to the lower docking structures;

[0007] A lower die working groove is formed on the top surface of the lower die structure, two protrusions are fixedly connected to the top surface of the lower die structure, one protrusion is arranged on one side of the lower die working groove, and the other protrusion is arranged on the other side of the lower die working groove. Two limiting grooves are formed on the bottom surface of the upper die structure, and the limiting grooves are matched with the corresponding protrusions;

[0008] A stamping structure is arranged in the middle of the inner side of the lower die working groove, and the plane of the stamping structure is higher than the plane of the lower die working groove;

[0009] A cutting structure is arranged on the inner side of the lower die working groove, and the cutting structure is located downstream of the running direction of the copper sheet.

[0010] Preferably, the upper guiding structure includes an upper die guiding column, an upper die sliding column, and an upper die limiting column. The axes of the upper die guiding column, the upper die sliding column, and the upper die limiting column are vertically arranged, and the upper die guiding column, the upper die sliding column, and the upper die limiting column are fixedly connected to the bottom surface of the upper die structure;

[0011] The lower docking structure includes a lower die guiding groove, a lower die sliding cylinder, and a lower die limiting post. The axes of the lower die guiding groove, the lower die sliding cylinder, and the lower die limiting post are vertically arranged. The lower die guiding groove and the lower die sliding cylinder are formed on the top surface of the lower die structure, and the lower die limiting post is fixedly connected to the top surface of the lower die structure.

[0012] The upper die guiding post is slidably connected to the inner side of the lower die guiding groove. The upper die sliding post is slidably connected to the inner side of the lower die sliding cylinder. The bottom surface of the upper die limiting post abuts against the top surface of the lower die limiting post.

[0013] Preferably, a rubber sleeve is sleeved outside the lower die sliding cylinder. The top end of the rubber sleeve is fixedly connected to the bottom surface of the upper die structure, and the bottom end of the rubber sleeve is fixedly connected to the top surface of the lower die structure.

[0014] Preferably, the stamping structure includes a stamping working plate. The stamping working plate is vertically slidably connected to the middle part of the inner side of the lower die working groove. A plurality of reset springs are arranged between the stamping working plate and the lower die working groove.

[0015] A plurality of lower die punching grooves are formed in the stamping working plate. The lower die punching grooves vertically penetrate through the stamping working plate. A plurality of punching knives are vertically and fixedly connected in the lower die working groove. The punching knives are slidably connected to the inner sides of the corresponding lower die punching grooves. A plurality of upper die punching grooves are arranged on the bottom surface of the upper die structure. The upper die punching grooves correspond to the lower die punching grooves one by one.

[0016] Preferably, the cutting structure includes a cutting knife. The cutting knife is fixedly connected to the inner side of the lower die working groove. A cutting knife groove is formed on the bottom surface of the upper die structure. The cutting knife corresponds to the cutting knife groove.

[0017] Preferably, a lower die positioning seam is formed in the middle of the protrusion. An upper die positioning strip is fixedly connected in the limiting groove. The upper die positioning strip corresponds to the lower die positioning seam.

[0018] Preferably, a plurality of top blocks are arranged in the lower die working groove.

[0019] Compared with the prior art, the present utility model has the following advantages and technical effects:

[0020] The utility model breaks through the traditional bending method. When in use, due to the action of the punching press, the bottom surface of the upper die structure will be attached to the top surface of the lower die working groove, and the height of the stamping structure is slightly higher than the plane of the lower die working groove. At this time, the upper die structure will press the stamping structure downward until the plane of the stamping structure is flush with the groove surface of the lower die working groove, and the stamping structure completes the bending of the lead frame functional area. The upper die is set as a concave surface and the lower die is set as a convex surface. Silver plating is carried out first and then stamping. The silver plating layer contacts the bottom surface of the upper die structure. When stamping, it can effectively solve the problem that downward bending at the cross section will press and damage the base conductor and the silver layer of the pin, affecting the wire bonding process during encapsulation. And a cutting structure is provided to cut the lead frame according to the length actually required by the operator. The bending and cutting of the utility model are integrated on one structure, and the lead frame can be continuously bent and cut without interruption, with high working efficiency. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings:

[0022] Figure 1 Schematic diagram of the overall structure of the present utility model Figure 1 ;

[0023] Figure 2 Schematic diagram of the overall structure of the present utility model Figure 2 ;

[0024] Figure 3 Schematic diagram of the structure of the upper die structure of the present utility model;

[0025] Figure 4 Schematic diagram of the structure of the lower die structure of the present utility model;

[0026] Figure 5 Cross-sectional view of the partial structure of the present utility model;

[0027] Among them, 1. Upper die structure; 101. Limit groove; 2. Lower die structure; 201. Protrusion; 202. Lower die working groove; 3. Upper guiding structure; 301. Upper die guiding column; 302. Upper die sliding column; 303. Upper die limit column; 4. Lower docking structure; 401. Lower die guiding groove; 402. Lower die sliding cylinder; 403. Lower die limit column; 5. Stamping structure; 501. Stamping working plate; 502. Return spring; 503. Lower die punching groove; 504. Punching knife; 505. Upper die punching groove; 6. Cutting structure; 601. Cutting knife; 602. Cutting knife groove; 7. Rubber sleeve; 801. Lower die positioning seam; 802. Upper die positioning strip; 9. Top block. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0030] Referring to Figures 1 to 5 , the present invention discloses a lead frame bending and cutting die, including: an upper die structure 1, the top surface of the upper die structure 1 is fixedly connected to the output end of a stamping machine, and a lower die structure 2 is arranged below the upper die structure 1, and the lower die structure 2 is installed on the frame of the stamping machine;

[0031] Upper guiding structures 3 are arranged at the bottom corners of the upper die structure 1, lower docking structures 4 are arranged at the top corners of the lower die structure 2, and the upper guiding structures 3 are slidably connected to the lower docking structures 4;

[0032] A lower die working groove 202 is formed on the top surface of the lower die structure 2, and two protrusions 201 are fixedly connected to the top surface of the lower die structure 2. One protrusion 201 is arranged on one side of the lower die working groove 202, and the other protrusion 201 is arranged on the other side of the lower die working groove 202. Two limit grooves 101 are formed on the bottom surface of the upper die structure 1, and the limit grooves 101 are matched with the corresponding protrusions 201;

[0033] In the middle of the inner side of the lower die working groove 202, a stamping structure 5 is arranged, and the plane of the stamping structure 5 is higher than the plane of the lower die working groove 202;

[0034] A cutting structure 6 is arranged on the inner side of the lower die working groove 202, and the cutting structure 6 is located downstream of the running direction of the copper sheet.

[0035] The utility model breaks through the traditional bending method. During use, due to the action of the punching press, the bottom surface of the upper die structure 1 will be in contact with the top surface of the lower die working groove 202. The height of the stamping structure 5 is slightly higher than the plane of the lower die working groove 202. At this time, the upper die structure 1 will press the stamping structure 5 downward until the plane of the stamping structure 5 is flush with the groove surface of the lower die working groove 202. The stamping structure 5 completes the bending of the lead frame functional area. The upper die is set as a concave surface and the lower die is set as a convex surface. After silver plating and then stamping, the silver plating layer contacts the bottom surface of the upper die structure 1. During stamping, it can effectively solve the problem that downward bending at the cross-section will damage the base conductor and the silver layer of the lead, affecting the wire bonding process during encapsulation. And the cutting structure 6 is provided to cut the lead frame according to the length actually required by the operator. The bending and cutting of the utility model are integrated into one structure, and the lead frame can be continuously bent and cut without interruption, with high working efficiency.

[0036] In a further optimized solution, the upper guiding structure 3 includes an upper die guiding column 301, an upper die sliding column 302, and an upper die limiting column 303. The axes of the upper die guiding column 301, the upper die sliding column 302, and the upper die limiting column 303 are vertically arranged, and the upper die guiding column 301, the upper die sliding column 302, and the upper die limiting column 303 are fixedly connected to the bottom surface of the upper die structure 1.

[0037] The lower docking structure includes a lower die guiding groove 401, a lower die sliding cylinder 402, and a lower die limiting column 403. The axes of the lower die guiding groove 401, the lower die sliding cylinder 402, and the lower die limiting column 403 are vertically arranged. The lower die guiding groove 401 and the lower die sliding cylinder 402 are opened on the top surface of the lower die structure 2, and the lower die limiting column 403 is fixedly connected to the top surface of the lower die structure 2.

[0038] The upper die guiding column 301 is slidably connected to the inner side of the lower die guiding groove 401, the upper die sliding column 302 is slidably connected to the inner side of the lower die sliding cylinder 402, and the bottom surface of the upper die limiting column 303 abuts against the top surface of the lower die limiting column 403.

[0039] In a further optimized solution, a rubber sleeve 7 is sleeved outside the lower die sliding cylinder 402. The top end of the rubber sleeve 7 is fixedly connected to the bottom surface of the upper die structure 1, and the bottom end of the rubber sleeve 7 is fixedly connected to the top surface of the lower die structure 2.

[0040] The upper guiding structure 3 and the lower docking structure 4 are in one-to-one correspondence, which can ensure that the stamping angle does not deviate.

[0041] In a further optimized solution, the stamping structure includes a stamping working plate 501. The stamping working plate 501 is vertically slidably connected to the middle part inside the lower die working groove 202, and a plurality of return springs 502 are arranged between the stamping working plate 501 and the lower die working groove 202.

[0042] The stamping working plate 501 is provided with a plurality of lower die punching grooves 503. The lower die punching grooves 503 vertically penetrate through the stamping working plate 501. A plurality of punching knives 504 are vertically and fixedly connected in the lower die working groove 202. The punching knives 504 are slidably connected to the inner sides of the corresponding lower die punching grooves 503. The bottom surface of the upper die structure 1 is provided with a plurality of upper die punching grooves 505, and the upper die punching grooves 505 correspond to the lower die punching grooves 503 one by one.

[0043] During use, the stamping working plate 501 will slide downward under the pressure of the upper die structure 1. At this time, the return spring 502 is compressed. The punching knives 504 extend out of the lower die punching grooves 503 and extend into the upper die punching grooves 505 to complete the bending. When the bottom surface of the upper die structure 1 leaves the lower die structure 2, due to the elastic potential energy of the return spring 502, the stamping working plate 501 can be automatically reset.

[0044] In a further optimized solution, the cutting structure includes a cutting knife 601. The cutting knife 601 is fixedly connected to the inner side of the lower die working groove 202. A cutting knife groove 602 is formed on the bottom surface of the upper die structure 1, and the cutting knife 601 corresponds to the cutting knife groove 602.

[0045] The cutting knife 601 can be embedded into the cutting knife groove 602 to cut the lead frame. Bending and cutting are integrated in one structure, and the lead frame can be continuously bent and cut without interruption, with high working efficiency.

[0046] In a further optimized solution, a lower die positioning slot 801 is formed in the middle of the protrusion 201. An upper die positioning strip 802 is fixedly connected in the limiting slot 101, and the upper die positioning strip 802 corresponds to the lower die positioning slot 801.

[0047] In a further optimized solution, a plurality of top blocks 9 are provided in the lower die working groove 202.

[0048] Setting the top blocks 9 can lift the lead frame together with the stamping working plate 501 when the upper die structure 1 leaves the lower die structure 2, preventing internal vacuum during pressing, facilitating the transportation of the lead frame, and improving the working efficiency.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, 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 should not be construed as a limitation to the present invention.

[0050] The embodiments described above are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A lead frame bending and cutting die, characterized in that: include: An upper die structure (1), the top surface of the upper die structure (1) is fixedly connected to the output end of the punching machine, a lower die structure (2) is provided below the upper die structure (1), and the lower die structure (2) is installed on the frame of the punching machine; An upper guide structure (3) is provided at a bottom corner of the upper mold structure (1), and a lower docking structure (4) is provided at a top corner of the lower mold structure (2), and the upper guide structure (3) is slidably connected to the lower docking structure (4); The top surface of the lower mold structure (2) is provided with a lower mold working groove (202), and two protrusions (201) are fixedly connected to the top surface of the lower mold structure (2), one of the protrusions (201) is provided on one side of the lower mold working groove (202), and the other protrusion (201) is provided on the other side of the lower mold working groove (202), and the bottom surface of the upper mold structure (1) is provided with two limiting grooves (101), and the limiting grooves (101) match the corresponding protrusions (201); A punching structure (5) is provided in the middle of the inner side of the lower die working groove (202), and the plane of the punching structure (5) is higher than the plane of the lower die working groove (202); A cutting structure (6) is provided inside the lower die working groove (202), and the cutting structure (6) is located downstream in the running direction of the copper sheet.

2. A lead frame bending and cutting die according to claim 1, characterized in that: The upper guide structure (3) comprises an upper die guide column (301), an upper die slide column (302), and an upper die limit column (303); the axes of the upper die guide column (301), the upper die slide column (302), and the upper die limit column (303) are vertically arranged; and the upper die guide column (301), the upper die slide column (302), and the upper die limit column (303) are fixedly connected to the bottom surface of the upper die structure (1); The lower docking structure comprises a lower die guide groove (401), a lower die slide cylinder (402), and a lower die limit column (403); the axes of the lower die guide groove (401), the lower die slide cylinder (402), and the lower die limit column (403) are arranged vertically; the lower die guide groove (401) and the lower die slide cylinder (402) are opened on the top surface of the lower die structure (2); and the lower die limit column (403) is fixedly connected to the top surface of the lower die structure (2); The upper die guide column (301) is slidably connected to the inner side of the lower die guide groove (401), the upper die slide column (302) is slidably connected to the inner side of the lower die slide cylinder (402), and the bottom surface of the upper die limit column (303) is in contact with the top surface of the lower die limit column (403).

3. A lead frame bending and cutting die according to claim 2, characterized in that: The outer side of the lower mold slide cylinder (402) is provided with a rubber sleeve (7), the top end of the rubber sleeve (7) is fixedly connected to the bottom surface of the upper mold structure (1), and the bottom end of the rubber sleeve (7) is fixedly connected to the top surface of the lower mold structure (2).

4. The lead frame bending and cutting die according to claim 1, characterized in that: The stamping structure comprises a stamping working plate (501), the stamping working plate (501) is vertically slidably connected to the middle part of the inner side of the lower die working groove (202), and a plurality of return springs (502) are arranged between the stamping working plate (501) and the lower die working groove (202); The stamping working plate (501) is provided with a plurality of lower die punching grooves (503), the lower die punching grooves (503) vertically penetrate the stamping working plate (501), the lower die working groove (202) is vertically fixedly connected with a plurality of punching knives (504), the punching knives (504) are slidably connected to the inner side of the corresponding lower die punching grooves (503), and the bottom surface of the upper die structure (1) is provided with a plurality of upper die punching grooves (505), the upper die punching grooves (505) correspond one-to-one to the lower die punching grooves (503).

5. The lead frame bending and cutting die according to claim 1, characterized in that: The cutting structure comprises a cutting knife (601), the cutting knife (601) is fixedly connected to the inner side of the lower die working groove (202), a cutting knife groove (602) is provided on the bottom surface of the upper die structure (1), and the cutting knife (601) corresponds to the cutting knife groove (602).

6. The lead frame bending and cutting die according to claim 1, characterized in that: A lower die positioning slit (801) is provided in the middle of the protrusion (201), an upper die positioning strip (802) is fixedly connected in the limiting groove (101), and the upper die positioning strip (802) corresponds to the lower die positioning slit (801).

7. The lead frame bending and cutting die according to claim 1, characterized in that: A plurality of top blocks (9) are arranged in the lower die working groove (202).

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