Stamping die forming mechanism for Z-shaped pin of lead frame

Abstract

The utility model discloses a stamping die forming mechanism for a Z-shaped pin of a lead frame, which comprises an upper die set and a lower die set, the upper die set is connected with a stripping die set for stamping and forming the pin of a material belt, and the stripping die set comprises a stripping back plate and a stripping plate. A pre-pressing assembly which penetrates through the stripper plate, can enable a pin of a material strap to be bent in a Z shape and can press the pin of the material strap to prevent the tip of the pin from tilting is embedded in the stripper plate; the lower die set is connected with a female die forming assembly which can be matched with the pre-pressing assembly to clamp the pins of the material belt, a female die forming insert on the female die forming assembly is matched with a stripping forming movable block on the pre-pressing assembly, the pins of the material belt can be clamped, the reliability of pin forming is ensured, and the production efficiency is improved. The pin tip is prevented from tilting upwards to be in contact with the stripping forming insert to be damaged, the integrity of the pin tip is improved, the phenomena that the plane area of a functional area is reduced and an electroplated layer is damaged due to collision are reduced, and therefore the electrical performance and reliability of a final product are improved.

Description

[Technical field]

[0002] The utility model relates to the technical field of stamping dies, in particular to a stamping die forming mechanism for Z-shaped pins of a lead frame. [Background technology]

[0004] The lead frame is a metal structural component used in semiconductor packaging. It is mainly used to achieve electrical connection between the internal circuit lead-out terminal of the chip and the external wire, forming a key structural component of the electrical circuit. In semiconductor packaging, it plays the role of carrying the chip, connecting the chip with the external circuit board electrical signal and installing and fixing it. It is widely used in many different types of products including diodes, triodes, transistors, field effect transistors, capacitors, resistors, inductors, etc.

[0005] Lead frames with Z-type lead designs are usually designed to meet specific packaging requirements, such as providing better electrical connection, heat dissipation or mechanical support.

[0006] For lead frames with Z-shaped pins produced by stamping, under conventional schemes, during the bending and forming process of the pins, when the punch just contacts the stamping strip, the tip of the pin will hit the die forming part, thereby damaging the tip of the pin; when the punch continues to move downward, the pin will gradually deform into a shape close to the Z shape, during which the damaged area of ​​the pin tip will also increase; when the punch reaches the bottom dead center, the pin is bent into the shape of the product design, and the tip of the pin collapses due to the damage, thereby reducing the plane area of ​​the pin functional area and damaging the electroplating layer in this area.

[0007] Therefore, there is an urgent need for a stamping forming mechanism disposed in a stamping die to solve the problem of pin tip damage when the lead frame is bent in a Z shape. [Contents of the utility model]

[0009] To this end, the utility model proposes a stamping die forming mechanism for a lead frame Z-shaped pin, aiming to solve the technical problems of pin tip damage and low product yield when the lead frame is bent in Z shape in the prior art.

[0010] The utility model is realized by the following technical solutions:

[0011] A stamping die forming mechanism for Z-shaped pins of a lead frame, comprising an upper die set and a lower die set, wherein the upper die set is connected to a stripping die for stamping and forming pins of a material strip, wherein the stripping die comprises a stripping back plate and a stripping plate, wherein a pre-pressing component is embedded in the stripping plate and can be used to bend the pins of the material strip in a Z-shape and to press the pins of the material strip to prevent the pin toes from tilting up;

[0012] The lower mold assembly is connected with a concave mold forming assembly which can cooperate with the pre-pressing assembly to clamp the material strip pins.

[0013] A stamping die forming mechanism for a lead frame Z-shaped pin as described above, wherein the pre-pressing assembly comprises a stripping forming insert penetrating through and embedded in the stripping plate and capable of bending the pin of the material strip in a Z-shape, wherein a stripping forming movable block is slidably connected in the stripping forming insert and capable of pressing the pin of the material strip to prevent the pin toe from tilting up;

[0014] The concave die forming component includes a concave die plate located in the lower die group, and a concave die forming insert pad, a concave die forming insert fixing block, and a concave die forming insert floating block for placing the material strip are arranged in sequence from bottom to top in the concave die plate. A concave die forming insert that can cooperate with the stripping forming movable block to clamp the material strip pin is fixedly connected in the concave die forming insert fixing block. The concave die forming insert passes through the concave die forming insert floating block and is slidably connected with it. The concave die forming insert floating block can slide up and down along the concave die forming insert in the concave die plate so as to abut or separate from the concave die forming insert fixing block.

[0015] In the stamping die forming mechanism for the Z-shaped pins of the lead frame as described above, the height of the stripping forming insert is the same as the thickness of the stripping plate, and the bottom of the stripping forming insert is provided with a groove matching the designed shape of the strip pin.

[0016] In the stamping die forming mechanism for the Z-shaped pins of the lead frame as described above, the cross section of the groove is in an eight-shaped shape with two sides inclined outwards.

[0017] As described above, in a stamping die forming mechanism for a lead frame Z-shaped pin, the height of the stripping and forming movable block is smaller than the height of the stripping and forming insert, and the height difference S between the two and the bending height H of the pin of the material strip after stamping and forming is related to S=H.

[0018] As described above, a stamping die forming mechanism for a lead frame Z-shaped pin also includes a pin arranged on an upper mold assembly and passing through the stripping back plate and corresponding to the stripping forming movable block. The pin can abut against or separate from the stripping forming movable block. When the pin abuts against the stripping forming movable block, the stripping forming movable block slides downward relative to the stripping forming insert until it is flush with the bottom surface of the stripping plate.

[0019] As described above, a stamping die forming mechanism for a lead frame Z-shaped pin, the top of the die forming insert is provided with a protrusion matching the groove, the top surface of the protrusion can clamp the strip pin together with the stripping forming movable block, and the inclined surfaces on both sides of the protrusion can cooperate with the groove to make the two side parts of the strip pin Z-shaped bend into a certain angle.

[0020] In the stamping die forming mechanism for the Z-shaped pins of the lead frame as described above, the bottom of the protruding portion is flush with the upper end surface of the concave die plate.

[0021] In the stamping die forming mechanism for the Z-shaped pin of the lead frame as described above, when the female die forming insert floating block abuts against the female die forming insert fixing block, the upper surface of the female die forming insert floating block is flush with the upper surface of the female die plate.

[0022] As described above, in a stamping die forming mechanism for a lead frame Z-shaped pin, when the die forming insert floating block is separated from the die forming insert fixing block to reach a maximum relative height, the upper end surface of the protrusion is relatively lower than the upper end surface of the die forming insert floating block.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] The present application discloses a stamping die forming mechanism for Z-shaped pins of a lead frame, which can effectively bend the material strip into a Z shape and press the pins of the material strip through the stripping forming inserts and the stripping forming movable block on the stripping plate, thereby ensuring the accuracy and stability of the pin forming; the die forming insert pad, the die forming insert fixing block and the die forming insert floating block arranged in the die plate form a precise pin forming space, wherein the die forming insert cooperates with the stripping forming movable block to clamp the pins of the material strip, thereby ensuring the reliability of the pin forming, preventing the pin toes from curling up and contacting and bruising the stripping forming insert, thereby improving the integrity of the pin tip, reducing the reduction in the plane area of ​​the functional area and the damage to the electroplating layer due to bruises, thereby improving the electrical performance and reliability of the final product.

Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0027] Figure 1 The schematic diagram of the assembly relationship structure of the embodiment during the strip stamping process Figure 1 ;

[0028] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0029] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0030] Figure 4 The schematic diagram of the assembly relationship structure of the embodiment during the strip stamping process Figure 2 ;

[0031] Figure 5 for Figure 4 The enlarged schematic diagram of the center C;

[0032] Figure 6 The schematic diagram of the assembly relationship structure of the embodiment during the strip stamping process Figure 3 ;

[0033] Figure 7 for Figure 6 The enlarged schematic diagram of point D in the middle;

[0034] Figure 8 The schematic diagram of the assembly relationship structure of the embodiment during the strip stamping process Figure 4 ;

[0035] Fig. 9 for Figure 8 The enlarged schematic diagram of point E in the middle;

[0036] Fig.10 It is a schematic diagram of the material strip stamping and bending forming state;

[0037] Fig.11 It is a schematic diagram of the initial bending forming state of the traditional Z-shaped pin;

[0038] Fig.12 It is a schematic diagram of the intermediate bending forming state of the conventional Z-type pin bending forming;

[0039] Fig.13 It is a schematic diagram of the final bending forming state of the traditional Z-type pin bending forming. [Specific implementation method]

[0041] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] The present embodiment provides a stamping die forming mechanism for a lead frame Z-shaped pin, which aims to solve the technical problems in the prior art of pin tip damage and low product yield when the lead frame is bent in Z shape.

[0043] See also Figures 1 to 13 A stamping die forming mechanism for Z-shaped pins of a lead frame includes an upper die set and a lower die set. The upper die set is connected to a stripping module for stamping and forming the pins of a material strip 3. The stripping module includes a stripping back plate 5 and a stripping plate 1. The stripping plate 1 is embedded with a pre-pressing component 100 which runs through it and can make the pins of the material strip 3 bend in a Z shape and can press the pins of the material strip 3 to prevent the pin toes from curling up; the lower die set is connected to a concave mold forming component 200 which can cooperate with the pre-pressing component 100 to clamp the pins of the material strip 3.

[0044] In this embodiment, the pins of the material strip 3 are pre-pressed by the pre-pressing component 100, and the pins of the material strip 3 are clamped in cooperation with the die forming component 200 during the stamping process, which can effectively prevent the pin toes from curling up and getting damaged during the stamping process, thereby improving production efficiency and yield rate. In addition, the die forming component 200 is also used for stripping the material strip 3 after stamping, and has multifunctionality.

[0045] Further, as a preferred embodiment of the present invention but not a limitation, the pre-pressing assembly 100 includes a stripping molding insert 11 that penetrates and is embedded in the stripping plate 1 and can bend the pins of the material strip 3 in a Z-shape, and a stripping molding movable block 111 that can press the pins of the material strip 3 to prevent the pins from tilting is slidably connected in the stripping molding insert 11;

[0046] The die molding component 200 includes a die plate 2 located in the lower mold group, and the die plate 2 is provided with a die molding insert pad 21, a die molding insert fixing block 22, and a die molding insert floating block 23 for placing the material strip 3 in sequence from bottom to top. The die molding insert fixing block 22 is fixedly connected with a die molding insert 221 that can cooperate with the stripping molding movable block 111 to clamp the pins of the material strip 3. The die molding insert 221 passes through the die molding insert floating block 23 and is slidably connected with it. The die molding insert floating block 23 can slide up and down along the die molding insert 221 in the die plate 2 so as to abut or separate from the die molding insert fixing block 22.

[0047] In this embodiment, the stripping molding insert 11 and the stripping molding movable block 111 on the stripping plate 1 can effectively make the material strip 3 Z-shaped and press the pins of the material strip 3 to prevent the pin toes from tilting. This ensures the accuracy and stability of the pin molding. The die molding insert pad 21, die molding insert fixing block 22 and die molding insert floating block 23 set in the die plate 2 form a precise pin molding space, wherein the die molding insert 221 cooperates with the stripping molding movable block 111 to clamp the pins of the material strip 3, ensure the reliability of the pin molding, and prevent the pin toes from tilting upward and contacting with the stripping molding insert 11.

[0048] Furthermore, as a preferred implementation mode of the present invention but not limitation, the height of the stripping molding insert 11 is the same as the thickness of the stripping plate 1 , and a groove 112 matching the design shape of the pins of the strip 3 is provided upwardly at the bottom of the stripping molding insert 11 .

[0049] In this embodiment, the height of the stripping molding insert 11 is the same as the thickness of the stripping plate 1, so that the stripping molding insert 11 is embedded in the stripping plate 1 to form a whole, thereby enhancing the stability and rigidity of the mechanism and ensuring that during the stamping process, the stripping plate 1 and the stripping molding insert 11 can work together to provide sufficient force to make the pins of the material strip 3 Z-shaped and press the pins, thereby improving the accuracy and efficiency of stamping.

[0050] The bottom of the stripping molding insert 11 is provided with a groove 112 that matches the designed shape of the pins of the material strip 3. The groove 112 fits the designed shape of the pins of the material strip 3, so that the pins can be better guided and positioned during the stamping process, effectively preventing the pins from warping or shifting during the stamping process, thereby ensuring the accuracy and quality of the pin molding.

[0051] Furthermore, as a preferred implementation of the present solution but not a limitation, the cross section of the groove 112 is in an eight-shaped shape with two sides inclined outwards.

[0052] In this embodiment, the figure-eight cross-section provides guide surfaces on both sides of the groove 112. When the pin forming part of the material strip 3 enters the groove 112, the guide surfaces can guide the pin to smoothly enter the correct position, so that the pin can be accurately bent during the stamping process.

[0053] Moreover, since the pins are subjected to a certain amount of pressure during the stamping process, the figure-eight cross-section design can provide a certain amount of clearance space, so that the pins are not easily over-deformed when under pressure, thereby ensuring the dimensional accuracy of the pins after forming. In addition, after the stamping is completed, the figure-eight cross-section can facilitate the pins to be removed from the groove 112, reduce the stripping resistance, and improve the stripping efficiency.

[0054] Furthermore, as a preferred implementation mode of the present invention but not limitation, the height of the stripping and forming movable block 111 is smaller than the height of the stripping and forming insert 11, and the height difference S between the two and the bending height H of the pins of the material strip 3 after stamping are related to each other as S=H.

[0055] In this embodiment, the height of the stripping and molding movable block 111 is less than the height of the stripping and molding insert 11, which ensures that the stripping and molding movable block 111 can slide inside the stripping and molding insert 11, and at the same time, a certain movable stroke can be generated during the stamping process, ensuring that the stripping and molding movable block 111 can flexibly respond to the stamping action with a smaller height difference, and realize accurate pressing and releasing of the pins of the material strip 3. At the same time, the height difference S between the two is set to be equal to the bending height H of the pins of the material strip 3 after stamping. The stripping and molding movable block 111 can accurately press the pins of the material strip 3 to the required bending position during the pressing process. This precise control can ensure that the bending height of each pin is consistent, thereby improving the yield and reliability of the product. In addition, this corresponding relationship enables the stamping force to be more effectively transmitted to the pin, prompting it to undergo precise deformation, which helps to reduce material stress concentration during the stamping process and avoid uneven deformation or breakage of the pin. It is foreseeable that the design can also change the bending height of the pin by adjusting the height difference S according to different product requirements, thereby enhancing the adaptability and versatility of the mold.

[0056] Furthermore, as a preferred implementation mode of the present invention but not a limitation, it also includes a pin 4 which is arranged on the upper mold assembly and passes through the stripping back plate 5 and corresponds to the stripping and molding movable block 111. The pin 4 can abut against or separate from the stripping and molding movable block 111. When the pin 4 abuts against and cooperates with the stripping and molding movable block 111, the stripping and molding movable block 111 slides downward relative to the stripping and molding insert 11 until it is flush with the bottom surface of the stripping plate 1.

[0057] In this embodiment, the function of the ejector pin 4 is to cooperate with the stripping and forming movable block 111, and to control the sliding of the stripping and forming movable block 111 through the action of abutting or separating. For details, see Figure 1-3 When the ejector pin 4 abuts against the stripping and molding movable block 111, the ejector pin 4 applies a downward pressure to the stripping and molding movable block 111, prompting the stripping and molding movable block 111 to slide downward relative to the stripping and molding insert 11. This sliding action makes the stripping and molding movable block 111 flush with the bottom surface of the stripping plate 1, preparing for the subsequent cooperation with the die molding insert 221 to clamp the pins of the material strip 3. Through the abutment and cooperation between the ejector pin 4 and the stripping and molding movable block 111, the sliding stroke of the stripping and molding movable block 111 can be accurately controlled, ensuring that during the stamping process, the stripping and molding movable block 111 can accurately press the pins of the material strip 3 in the first time, and release it in time when the stripping and molding movable block 111 and the die molding insert 221 cooperate to clamp the pins of the material strip 3, avoiding deformation of the material strip or damage to the pins caused by excessive compression.

[0058] Furthermore, as a preferred implementation mode of the present invention but not a limitation, the top of the die molding insert 221 is provided with a protrusion 2211 matching the groove 112, the top surface of the protrusion 2211 can clamp the pins of the material strip 3 together with the stripping molding movable block 111, and the inclined surfaces on both sides of the protrusion 2211 can cooperate with the groove 112 to make the two side parts of the pins of the material strip 3 Z-shaped bent at a certain angle.

[0059] In this embodiment, through the precise cooperation between the protrusion 2211 and the groove 112, the pin shape can be accurately controlled to ensure that the pins of the material strip 3 are bent and formed according to a predetermined angle and shape, thereby improving the accuracy and consistency of the pin forming. The protrusion 2211 and the stripping and forming movable block 111 jointly clamp the pin, thereby enhancing the stability during the stamping process, reducing the risk of pin deviation or deformation, and improving the stamping quality.

[0060] Further, as a preferred implementation of the present solution but not a limitation, the bottom of the protrusion 2211 is flush with the upper end surface of the concave template 2 .

[0061] In this embodiment, by making the bottom of the protrusion 2211 flush with the upper end surface of the concave mold plate 2, the internal space of the concave mold plate 2 is maximized without increasing the overall height of the mold, making the mold structure more compact and further improving the effect and efficiency of the entire mechanism for Z-type pin forming.

[0062] Further, as a preferred implementation of the present solution but not a limitation, when the die molding insert floating block 23 abuts against the die molding insert fixing block 22 , the upper surface of the die molding insert floating block 23 is flush with the upper surface of the die plate 2 .

[0063] In this embodiment, when the floating block 23 of the concave mold molding insert is flush with the upper surface of the concave mold plate 2, specifically, see Figure 6-7 , refers to when the die molding insert floating block 23 slides down along the die molding insert 221 to abut against the die molding insert fixing block 22, at this time, a Z-shaped pin bending has been stamped, and the upper surface of the die molding insert floating block 23 is flush with the upper surface of the die plate 2, ensuring that the lead frame as a whole is accurately formed according to the designed shape, thereby improving the accuracy and quality of pin molding.

[0064] Furthermore, as a preferred implementation mode of the present invention but not a limitation, when the die molding insert floating block 23 is separated from the die molding insert fixing block 22 and reaches a maximum relative height, the upper end surface of the protrusion 2211 is relatively lower than the upper end of the die molding insert floating block 23.

[0065] In this example, see Figure 1-3When the die molding insert floating block 23 is separated from the die molding insert fixed block 22 and reaches the maximum relative height, it means that the die molding insert floating block 23 slides upward to its maximum stroke position. At this time, the upper end surface of the protrusion 2211 is located below the upper end surface of the die molding insert floating block 23. Specifically, when the material strip 3 is punched once, when in the above state, the material strip 3 is first sent to the die molding insert floating block 23 by the punch press feeding device, and the upper mold assembly moves downward as a whole. The stripping molding insert 11 first cooperates with the die molding insert floating block 23 to pre-press the material strip 3. At this time, the stripping molding movable block 111 is flush with the bottom surface of the stripping molding insert 11, but does not act on the pin part of the material strip 3. Instead, the stripping molding insert 11 and the die molding insert floating block 23 maintain the pre-pressing of the material strip 3 and move downward synchronously to the pin part of the material strip 3 and the die molding insert 2 When the raised portion 2211 of 21 abuts, the stripping molding movable block 111 cooperates with the raised portion 2211 to clamp the pins of the material strip 3. Then, the die molding insert lifting block 23 and the stripping molding insert 11 continue to move downward synchronously until the upper end surface of the die molding insert lifting block 23 is flush with the upper end surface of the die plate 2, and the Z-shaped pins of the material strip 3 are completely bent and formed. Compared with the direct stamping process under the prior art, this stamping process of pre-pressing and then bending has the advantages of being more stable and accurate, effectively avoiding the warping and bruising of the pins of the material strip, and greatly improving the quality of the finished product and the production yield. It should be supplemented that the die molding insert lifting block 23 slides upward to its maximum stroke position above the raised portion 2211, which also helps the finished product to be completely separated from the die molding insert 221, thereby improving the success rate and efficiency of stripping.

[0066] Furthermore, as a preferred implementation mode of the present invention but not a limitation, when the pins of the material strip 3 are stamped and formed, the stripping and forming movable block 111 slides upward relative to the stripping and forming insert 11 under the abutment of the pins of the material strip 3, and the final relative distance L of the sliding is equal to the bending height H of the pins of the material strip 3 after stamping and forming.

[0067] In this example, see Figure 6-9 When the pins of the material strip 3 are stamped, the ejector pin 4 begins to separate from the stripping and molding movable block 111. At this time, the pins of the material strip 3 will contact the stripping and molding movable block 111 and exert an upward reaction force on it, so that the stripping and molding movable block 111 slides relatively upward inside the stripping and molding insert 11. The final relative distance L of the sliding is equal to the bending height H of the pins of the material strip 3 after stamping. At this time, the pins of the material strip 3 are completely bent and formed, and the stripping and molding movable block 111 also slides to its original position to prepare for the next stamping.

[0068] The working principle of the utility model is as follows:

[0069] The utility model provides a stamping die forming mechanism for a lead frame Z-shaped pin, aiming to solve the technical problem in the prior art that the pin toes are easily lifted and damaged during the stamping forming of the lead frame strip of the Z-shaped pin, resulting in low pin forming precision and low product yield. The following is a detailed description of its working principle:

[0070] A stamping die forming mechanism for Z-shaped pins of a lead frame includes an upper die set and a lower die set. The upper die set is connected to a stripping die for stamping a material strip. The stripping die includes a stripping back plate and a stripping plate. A stripping forming insert is embedded on the stripping plate, and the insert can bend the material strip into a Z shape. A stripping forming movable block is slidably connected inside the stripping forming insert, and is used to press the pins of the material strip to prevent the pin toes from being lifted and bumped.

[0071] The concave mold plate is provided with a concave mold forming insert pad, a concave mold forming insert fixing block and a concave mold forming insert floating block. The concave mold forming insert is fixedly connected to the concave mold forming insert fixing block, and the insert can cooperate with the stripping forming movable block to clamp the pins of the material strip. The concave mold forming insert floating block can slide up and down along the concave mold forming insert in the concave mold plate, thereby abutting or separating from the concave mold forming insert fixing block.

[0072] During the stamping process, the stripping molding insert and the stripping molding movable block work together to bend the pins of the material strip in a Z shape and press the pins to ensure the accuracy and stability of the pin molding. The die molding insert cooperates with the stripping molding movable block to clamp the pins of the material strip, ensuring the reliability of the pin molding and preventing the pin toes from curling up.

[0073] In addition, the bottom of the stripping molding insert is provided with a groove matching the shape of the strip pin, which is used to guide and position the pin to prevent the pin from warping or shifting during the stamping process. The top of the die molding insert is provided with a protrusion matching the groove, which is used to clamp the pin together with the stripping molding movable block and make the two sides of the pin Z-shaped bend at a certain angle.

[0074] The mechanism is also provided with an ejector pin for controlling the sliding of the stripping and forming movable block, thereby realizing precise control of the sliding stroke of the stripping and forming movable block. Through these designs, the stamping die can improve the precision and quality of pin forming, reduce the risk of pin offset or deformation, and improve the efficiency of stamping forming.

[0075] It should be added that in the stamping process, the stripping molding insert first cooperates with the die molding insert floating block to pre-press the material strip. At this time, the stripping molding movable block is flush with the bottom surface of the stripping molding insert, but does not act on the pin part of the material strip. Instead, the stripping molding insert and the die molding insert floating block maintain the pre-pressure on the material strip and move downward synchronously until the pin part of the material strip abuts against the raised part of the die molding insert. The stripping molding movable block then cooperates with the raised part to clamp the pin of the material strip. Then, the die molding insert floating block and the stripping molding insert continue to move downward synchronously until the upper end surface of the die molding insert floating block is flush with the upper end surface of the die template, and the Z-shaped pin of the material strip is completely bent and formed. This stamping process of pre-pressing first and then bending is relatively simple. Compared with the direct stamping process under the existing technology, it has the advantages of being smoother and more accurate, effectively avoiding the tip of the pin of the material strip from being lifted up and damaged, and greatly improving the quality of the finished product and production yield. When the pin of the material strip is stamped and formed, the ejector pin first begins to separate from the stripping and forming movable block to form a concession space. At this time, the pin part of the material strip will contact the stripping and forming movable block and exert an upward reaction force on it, so that the stripping and forming movable block slides relatively upward inside the stripping and forming insert, and then the die forming insert floating block rises upward again to separate the bent material strip from the die forming insert. Due to the existence of the concession space formed by the separation of the ejector pin and the stripping and forming movable block, there is no need to worry about the material strip after stamping being pressed and deformed by the stripping and forming movable block during the upward separation process.

[0076] The above are implementation methods provided in combination with specific contents, and it is not intended that the specific implementation of this application is limited to these descriptions. Any method structure similar to the present application, or a number of technical deductions or replacements based on the concept of the present application, should be considered as the protection scope of this application.

Claims

1. A stamping die forming mechanism for a lead frame Z-shaped pin, comprising an upper die set and a lower die set, wherein the upper die set is connected to a stripping die for stamping the pins of a material strip (3), the stripping die comprising a stripping back plate (5) and a stripping plate (1), characterized in that: The stripping plate (1) is embedded with a pre-pressing component (100) running through it, which can bend the pins of the material strip (3) in a Z-shape and can press the pins of the material strip (3) to prevent the pin toes from tilting up; The lower mold assembly is connected to a concave mold forming assembly (200) which can cooperate with the pre-pressing assembly (100) to clamp the pins of the material strip (3).

2. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 1, characterized in that: The pre-pressing assembly (100) comprises a stripping molding insert (11) penetrating through and embedded in the stripping plate (1) and capable of bending the pins of the material strip (3) in a Z-shape, wherein a stripping molding movable block (111) is slidably connected in the stripping molding insert (11) and capable of pressing the pins of the material strip (3) to prevent the pin toes from tilting up; The die forming assembly (200) comprises a die plate (2) located in the lower die group, wherein the die plate (2) is provided with a die forming insert pad (21), a die forming insert fixing block (22), and a die forming insert floating block (23) for placing the material strip (3) in sequence from bottom to top, wherein the die forming insert fixing block (22) is fixedly connected with a die forming insert (221) which can cooperate with the stripping forming movable block (111) to clamp the pin of the material strip (3), wherein the die forming insert (221) passes through the die forming insert floating block (23) and is slidably connected thereto, and the die forming insert floating block (23) can slide up and down along the die forming insert (221) in the die plate (2) so as to abut against or separate from the die forming insert fixing block (22).

3. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 2, characterized in that: The height of the stripping molding insert (11) is the same as the thickness of the stripping plate (1), and a groove (112) matching the design shape of the pins of the material strip (3) is provided at the bottom of the stripping molding insert (11) facing upward.

4. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 3, characterized in that: The cross section of the groove (112) is in an eight-shaped shape with two sides inclined outwards.

5. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 2, characterized in that: The height of the stripping and forming movable block (111) is smaller than the height of the stripping and forming insert (11), and the relationship between the height difference S between the two and the bending height H of the pin of the material strip (3) after stamping is S=H.

6. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 5, characterized in that: It also includes an ejector pin (4) disposed on the upper mold assembly and passing through the stripping back plate (5) and corresponding to the stripping molding movable block (111); the ejector pin (4) can abut against or separate from the stripping molding movable block (111); when the ejector pin (4) abuts against the stripping molding movable block (111), the stripping molding movable block (111) slides downward relative to the stripping molding insert (11) until it is flush with the bottom surface of the stripping plate (1).

7. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 4, characterized in that: The top of the concave mold insert (221) is provided with a protrusion (2211) matching the groove (112); the top surface of the protrusion (2211) can clamp the pins of the material strip (3) together with the stripping and molding movable block (111); the inclined surfaces on both sides of the protrusion (2211) can cooperate with the groove (112) to allow the two side portions of the pins of the material strip (3) to be Z-shaped and bent at a certain angle.

8. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 7, characterized in that: The bottom of the raised portion (2211) is flush with the upper end surface of the concave mold plate (2).

9. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 8, characterized in that: When the concave die forming insert floating block (23) abuts against the concave die forming insert fixing block (22), the upper surface of the concave die forming insert floating block (23) is flush with the upper surface of the concave die plate (2).

10. A stamping die forming mechanism for a lead frame Z-shaped pin according to claim 9, characterized in that: When the die forming insert floating block (23) and the die forming insert fixing block (22) are separated to reach a maximum relative height, the upper end surface of the protrusion (2211) is relatively lower than the upper end surface of the die forming insert floating block (23).

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