Stamping die for manufacturing Z-type pin lead frame

Abstract

The utility model belongs to the technical field of stamping dies, and particularly relates to a stamping die for manufacturing a Z-type pin lead frame, which comprises an upper die set, a lower die set, a stripping die set connected with the upper die set and used for stamping and forming a material belt, and a pre-pressing assembly connected with the upper die set and penetrating through the stripping die set, the pre-pressing assembly is used for pressing the tip ends of the material strap pins before punch forming, and the pre-pressing assembly slides up and down relative to the stripping module. According to the stamping die for manufacturing the Z-shaped pin lead frame, before the upper die set moves downwards relative to the lower die set to press the material strip, the pin tips of the material strip are pressed in advance through the pre-pressing assembly, the problem of collision caused by displacement of the tips in the pressing process is avoided, the integrity of the pin tips is improved, and the production efficiency of the Z-shaped pin lead frame is improved. And the phenomena that the plane area of the functional area is reduced and the electroplated layer is damaged due to bumping are reduced, so that the electrical performance and the reliability of a final product are improved.

Description

[Technical field]

[0001] The present application belongs to the technical field of stamping dies, and in particular relates to a stamping die for manufacturing a Z-shaped pin lead frame. [Background technology]

[0002] Semiconductor discrete devices are widely used in many different types of products including diodes, triodes, transistors, field effect transistors, capacitors, resistors, inductors, etc. The lead frame, as the carrier of the semiconductor discrete package, has the characteristic of the pins bent into a Z shape. With the help of bonding wires, the electrical connection between the internal circuit lead end of the chip and the external lead is realized to form an electrical circuit structure. It serves as a bridge connecting with external wires. Due to the shape characteristics of the semiconductor discrete lead frame, the pins are bent into a Z shape when produced by stamping method.

[0003] The pin bending process is divided into the following forms. The initial bending state is as follows: Fig.12 : When the upper stripping forming insert just contacts the stamping strip, the pin tip will hit the stripping forming insert, thus damaging the pin tip; the middle bending forming state is as follows Fig.13 :As the punch press continues to move downward, the pin will gradually deform into a Z-shaped shape, and the area of ​​the pin tip that was damaged will also increase; the final bending state is as follows Fig.14 :When the punch press reaches the bottom dead center, the pin is bent into the shape required by the product drawing. The tip of the pin collapses due to damage, thereby reducing the plane area of ​​the pin functional area and damaging the electroplating layer in this area. [Contents of the utility model]

[0004] In order to solve the problem of pin tip damage when the lead frame is bent in Z shape in the prior art, the present application provides a stamping die for manufacturing a Z-shaped pin lead frame using a forming pre-pressing and delayed stripping technology.

[0005] This application is implemented through the following technical solutions:

[0006] A stamping die for manufacturing a Z-shaped pin lead frame comprises an upper die set and a lower die set, a stripping die connected to the upper die set and used for stamping a material strip, and a pre-pressing component connected to the upper die set and passing through the stripping die, wherein the pre-pressing component is used for pressing the pin tips of the material strip before stamping, and the pre-pressing component slides up and down relative to the stripping die.

[0007] As described above, a stamping die for manufacturing a Z-shaped pin lead frame, the pre-pressing assembly includes a side push block slidably connected to the upper mold group in the horizontal direction, a side push column connected to the lower mold group and for the upper mold group to pass through, and an ejector plate located on the inner side of the side push block and connected to the upper mold group, the ejector plate is provided with an ejector, the stripping module is provided with a stripping forming insert and a stripping forming movable block slidably connected to the stripping forming insert, the ejector passes through the side push block and the stripping module in turn and abuts against or separates from the stripping forming movable block.

[0008] As described above, a stamping die for manufacturing a Z-shaped pin lead frame, the side push column is provided with a first inclined surface, the side push block is provided with a second inclined surface matching the first inclined surface, the ejector plate is provided with a first protrusion, the side push block is provided with a second protrusion, the ejector plate is connected to the upper mold assembly through an ejector spring, and the upper mold assembly is connected to a side of the side push block away from the side push column through a side push spring.

[0009] As described above, in a stamping die for manufacturing a Z-shaped pin lead frame, when the upper die set moves upward relative to the lower die set, the first inclined surface and the second inclined surface cooperate to drive the second protrusion to be misaligned with the first protrusion, so that the ejector plate is close to the side push block, and then the ejector pushes the stripping and forming movable block to the bottom of the stripping and forming insert; when the upper die set moves downward relative to the lower die set, the first inclined surface and the second inclined surface cooperate to drive the second protrusion to be abutted against the first protrusion, so that the ejector plate is away from the side push block, and then the ejector is separated from the stripping and forming movable block.

[0010] A stamping die for manufacturing a Z-shaped pin lead frame as described above, wherein the upper die assembly includes an upper die base, an upper pad and a punch fixing plate connected in sequence from top to bottom, the stripping module includes a stripping back plate and a stripping plate, the lower die assembly includes a lower die base, a lower pad and a concave die plate connected in sequence from bottom to top, the upper die base is movably connected with a suspension assembly that passes through the upper pad and the punch fixing plate and is connected to the stripping back plate, the upper die base is provided with an upper die limit column, and the lower die base is provided with a lower die limit column corresponding to the upper die limit column.

[0011] As described above, a stamping die for manufacturing a Z-shaped pin lead frame, the concave mold plate is provided with a concave die forming insert pad, a concave die forming insert fixing block, a concave die forming insert floating block, and a concave die forming insert arranged on the concave die forming insert pad and passing through the concave die forming insert fixing block and the concave die forming insert floating block in sequence upward; when the concave die forming insert floating block slides upward along the concave die forming insert relative to the concave die forming insert fixing block, the top of the concave die forming insert sinks into the concave die forming insert floating block; when the concave die forming insert floating block slides downward along the concave die forming insert relative to the concave die forming insert fixing block, the top of the concave die forming insert protrudes from the upper surface of the concave die forming insert floating block.

[0012] As described above, in a stamping die for manufacturing a Z-shaped pin lead frame, the stripping and forming movable block cooperates with the die forming insert to press the tip of the material strip pin before stamping and forming, and the stripping and forming insert, the stripping and forming movable block, the die forming insert and the die forming insert floating block cooperate with each other to stamp and form the material strip.

[0013] In the stamping die for manufacturing a Z-shaped pin lead frame as described above, the spacing distance between the side push block and the upper mold assembly is S, the thickness of the ejector plate is D, the height of the first protrusion is H1, the height of the second protrusion is H2, and the thickness of the material strip is B, wherein S≥D+H1+H2+B.

[0014] In the stamping die for manufacturing a Z-shaped lead frame as described above, chamfers are respectively provided on both sides of the first protrusion and the second protrusion.

[0015] As described above, in a stamping die for manufacturing a Z-shaped pin lead frame, when the upper die set moves downward relative to the lower die set, the floating block of the die forming insert moves downward to press the material strip into shape; when the upper die set moves upward relative to the lower die set, the floating block of the die forming insert moves upward to separate the material strip from the die forming insert.

[0016] Compared with the prior art, this application has the following advantages:

[0017] The present application discloses a stamping die for manufacturing a Z-shaped pin lead frame. Before an upper die group moves downward relative to a lower die group to press the material strip, a pre-pressing component is used to press the pin tips of the material strip in advance, thereby avoiding damage caused by displacement of the tips during pressing, improving the integrity of the pin tips, and reducing the reduction in planar area of ​​the functional area and damage to the electroplating layer caused by damage, thereby improving the electrical performance and reliability of the final product.

Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 Magnified view at A in the middle;

[0021] Figure 3 yes Figure 1 Magnified view at B in the middle;

[0022] Figure 4 This is a schematic diagram of the first working state of the embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the second working state of the embodiment of the present application;

[0024] Figure 6 This is a schematic diagram of the third working state of the embodiment of the present application;

[0025] Figure 7 This is a schematic diagram of the fourth working state of the embodiment of the present application;

[0026] Figure 8 This is a schematic diagram of the fifth working state of the embodiment of the present application;

[0027] Fig. 9 This is a schematic diagram of the sixth working state of the embodiment of the present application;

[0028] Fig.10 This is a schematic diagram of the seventh working state of the embodiment of the present application;

[0029] Fig.11 This is a schematic diagram of the eighth working state of the embodiment of the present application;

[0030] Fig.12 It is a schematic diagram of the initial bending forming state of the conventional pin bending forming;

[0031] Fig.13 It is a schematic diagram of the intermediate bending forming state of the conventional pin bending forming;

[0032] Fig.14 It is a schematic diagram of the final bending forming state of traditional pin bending. [Specific implementation method]

[0033] 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.

[0034] See also Figures 1 to 14 A stamping die for manufacturing a Z-shaped pin lead frame includes an upper die set 1 and a lower die set 2, a stripping die 3 connected to the upper die set 1 and used for stamping a material strip 5, and a pre-pressing component 4 connected to the upper die set 1 and passing through the stripping module 3, wherein the pre-pressing component 4 is used for pressing the pin tips of the material strip 5 before stamping, and the pre-pressing component 4 slides up and down relative to the stripping module 3.

[0035] The present application discloses a stamping die for manufacturing a Z-shaped pin lead frame. Before an upper die group moves downward relative to a lower die group to press the material strip, a pre-pressing component is used to press the pin tips of the material strip in advance, thereby avoiding damage caused by displacement of the tips during pressing, improving the integrity of the pin tips, and reducing the reduction in planar area of ​​the functional area and damage to the electroplating layer caused by damage, thereby improving the electrical performance and reliability of the final product.

[0036] Furthermore, as a preferred embodiment of the present invention but not a limitation, the pre-pressing assembly 4 includes a side push block 41 slidably connected to the upper mold module 1 in a horizontal direction, a side push column 42 connected to the lower mold module 2 and for the upper mold module 1 to pass through, and a pin plate 43 located on the inner side of the side push block 41 and connected to the upper mold module 1, the pin plate 43 is provided with a pin 431, the stripping module 3 is provided with a stripping forming insert 31 and a stripping forming movable block 32 slidably connected to the stripping forming insert 31, the pin 431 sequentially passes through the side push block 41 and the stripping module 3 and abuts against or separates from the stripping forming movable block 32.

[0037] In this embodiment, the horizontal sliding connection of the pre-pressing assembly on the upper mold assembly is realized through the cooperation of the side push block and the side push column, so that the pre-pressing assembly can be accurately adjusted in position as needed, thereby improving the flexibility and adaptability of the stamping die. Secondly, the ejector plate is located on the inner side of the side push block and is connected to the upper mold assembly. The ejector plate is provided with an ejector. This structural design enables the ejector to accurately press the pin tip of the material strip, thereby avoiding damage to the pin tip during the stamping process and improving the production quality of the lead frame. In addition, the stripping forming insert on the stripping module and the stripping forming movable block slidably connected thereto cooperate with the ejector to realize the stamping and stripping functions of the material strip, making the stamping process more efficient and reliable.

[0038] Further, as a preferred implementation mode of the present invention but not limiting, the side push block 41 is provided with a clearance groove for the ejector pin 431 to pass through and enable the side push block 41 to slide in the horizontal direction relative to the ejector pin 431. In this embodiment, the existence of the clearance groove enables the ejector pin to pass through the side push block smoothly, avoids the ejector pin from hindering the movement of the side push block, and ensures that the side push block can move in the horizontal direction.

[0039] Further, as a preferred embodiment of the present invention but not a limitation, the side thrust column 42 is provided with a first inclined surface 421, the side thrust block 41 is provided with a second inclined surface 411 cooperating with the first inclined surface 421, the ejector plate 43 is provided with a first protrusion 432, the side thrust block 41 is provided with a second protrusion 412, the ejector plate 43 is connected to the upper mold assembly 1 via an ejector spring 433, and the upper mold assembly 1 is connected to the side of the side thrust block 41 away from the side thrust column 42 via a side thrust spring 413.

[0040] In this embodiment, by setting the first inclined surface and the second inclined surface on the side thrust column and the side thrust block, and setting the first protrusion and the second protrusion on the ejector plate and the side thrust block, and combining the connection between the ejector spring and the side thrust spring, the precise positioning and flexible movement of the pre-pressing assembly are achieved. The cooperation of the first inclined surface and the second inclined surface can drive the ejector plate to drive the ejector to move in the vertical direction; the setting of the first protrusion and the second protrusion can realize that the relative position between the ejector plate and the side thrust block is restricted or released when the upper mold assembly rises or falls relative to the lower mold assembly, respectively, so that the ejector can timely press the pin tip of the material strip or perform the next stamping operation. The connection between the ejector spring and the side thrust spring provides the necessary elastic restoring force, ensuring the stable operation and reliable positioning of the pre-pressing assembly.

[0041] Further, as a preferred embodiment of the present scheme but not a limitation, when the upper mold assembly 1 moves upward relative to the lower mold assembly 2, the second protrusion 412 is driven to be misaligned with the first protrusion 432 under the cooperation of the first inclined surface 421 and the second inclined surface 411, so that the ejector plate 43 is close to the side push block 41, and then the ejector 431 pushes the stripping forming movable block 32 to the bottom of the stripping forming insert 31; when the upper mold assembly 1 moves downward relative to the lower mold assembly 2, the second protrusion 412 is driven to be abutted against the first protrusion 432 under the cooperation of the first inclined surface 421 and the second inclined surface 411, so that the ejector plate 43 is away from the side push block 41, and then the ejector 431 is separated from the stripping forming movable block 32.

[0042] In this embodiment, the upper mold assembly is moved up and down, and the first and second inclined surfaces cooperate to achieve the approach and separation between the ejector plate and the side push block, thereby controlling the contact and separation between the ejector and the stripping forming movable block. When the upper mold assembly moves upward, the first and second inclined surfaces drive the second protrusion to be misaligned with the first protrusion, so that the ejector plate approaches the side push block, and the ejector then pushes the stripping forming movable block to the bottom of the stripping forming insert to complete the pre-pressing of the tip of the material strip pin. When the upper mold assembly moves downward, the first and second inclined surfaces drive the second protrusion to abut against the first protrusion, so that the ejector plate is away from the side push block, and the ejector is separated from the stripping forming movable block, preparing for the subsequent stamping operation. This design can accurately control the pre-pressing and separation process of the ejector, avoid the damage to the tip of the pin, and improve the stamping quality. At the same time, through the cooperation of the inclined surface and the protrusion, the automatic positioning and resetting of the pre-pressing component is realized, the operation process is simplified, and the production efficiency is improved.

[0043] Furthermore, as a preferred embodiment of the present invention but not a limitation thereof, the upper die assembly 1 includes an upper die base 11, an upper pad 12 and a punch fixing plate 13 connected in sequence from top to bottom, the stripping module 3 includes a stripping back plate 33 and a stripping plate 34, the lower die assembly 2 includes a lower die base 21, a lower pad 22 and a concave die plate 23 connected in sequence from bottom to top, the upper die base 11 is movably connected with a suspension assembly 14 that passes through the upper pad 12 and the punch fixing plate 13 and is connected to the stripping back plate 33, the upper die base 11 is provided with an upper die limit column 15, and the lower die base 21 is provided with a lower die limit column 24 corresponding to the upper die limit column 15.

[0044] In this embodiment, the upper die set is composed of an upper die seat, an upper pad and a punch fixing plate, the stripping die set is composed of a stripping back plate and a stripping plate, and the lower die set is composed of a lower die seat, a lower pad and a concave die plate. This layered structure makes the functions of each part clear and easy to maintain and replace. The suspension assembly passes through the upper pad and the punch fixing plate and is connected to the stripping back plate, so that the upper die set and the stripping die set can move in coordination, while reducing the weight of the upper die set and improving the stamping efficiency. The setting of the upper die limit column and the lower die limit column can limit the distance between the upper die set and the lower die set when they move relative to each other, thereby ensuring the stamping quality. These components can also be further optimized. For example, the design of the suspension assembly can be improved, and lighter and stronger materials can be used to enhance its load-bearing capacity and service life; the position and size of the upper die limit column and the lower die limit column can be optimized to adapt to different specifications of material strips and stamping requirements; a buffer device, such as a spring or a rubber pad, can be added to reduce the impact force during the stamping process and protect the mold and the material strip. These improvements will further enhance the reliability, adaptability and production efficiency of stamping dies.

[0045] Furthermore, as a preferred embodiment of the present scheme but not a limitation, the concave mold plate 23 is provided with a concave mold forming insert pad 231, a concave mold forming insert fixing block 232, a concave mold forming insert floating block 233, and a concave mold forming insert 234 which is arranged on the concave mold forming insert pad 231 and passes through the concave mold forming insert fixing block 232 and the concave mold forming insert floating block 233 in sequence upwards; when the concave mold forming insert floating block 233 slides upward along the concave mold forming insert 234 relative to the concave mold forming insert fixing block 232, the top of the concave mold forming insert 234 sinks into the concave mold forming insert floating block 233; when the concave mold forming insert floating block 233 slides downward along the concave mold forming insert 234 relative to the concave mold forming insert fixing block 232, the top of the concave mold forming insert 234 protrudes outward from the upper surface of the concave mold forming insert floating block 233.

[0046] In this embodiment, when the floating block of the die forming insert drives the already pressed and formed material strip to move upward, under the cooperation of the pre-pressing assembly, the ejector moves upward for a certain distance, so that the stripping forming movable block is not abutted by the ejector, so as to provide a space when the floating block of the die forming insert drives the material strip to rise, thereby preventing the already pressed and formed material strip from being squeezed and deformed, and achieving the effect of delayed stripping. And when the floating block of the die forming insert slides upward, the top of the die forming insert sinks into it, so that the material strip can be smoothly placed on the die forming insert. And when the floating block of the die forming insert slides downward, the top of the die forming insert bulges outward, and cooperates with the stripping forming insert to stamp and form the material strip. This floating structural design enables the die forming insert to be flexibly raised and lowered according to the needs of the stamping process, which not only facilitates the positioning and placement of the material strip, but also ensures the accuracy and consistency of the stamping. In addition, the gap distance between the ejector pin and the stripping and forming movable block can be specifically set according to the bending height of the upper and lower pins of the Z-shaped material strip.

[0047] Furthermore, as a preferred embodiment of the present scheme but not a limitation, the stripping and forming movable block 32 cooperates with the die forming insert 234 to press the pin tip of the material strip 5 before stamping, and the stripping and forming insert 31 cooperates with the die forming insert lifting block 233 to stamp the material strip 5.

[0048] In this embodiment, the pre-pressing of the pin tips of the material strip before stamping is achieved by the cooperation between the stripping and forming movable block and the die forming insert, thereby avoiding damage to the pin tips during the stamping process and improving the production quality of the lead frame. At the same time, the cooperation between the stripping plate and the die forming insert floating block ensures the correct positioning and forming of the material strip during the stamping process, so that the stamped lead frame has accurate size and consistent shape. The scrap rate in the stamping process is reduced, production efficiency is improved, and the electrical and mechanical properties of the lead frame can be improved. The pre-pressing step makes the pin tips smoother, reduces problems such as cold soldering or poor welding that may occur in the subsequent welding process, and accurate stamping ensures the mechanical strength and reliability of the lead frame.

[0049] Furthermore, as a preferred implementation of the present solution but not a limitation, the spacing distance between the side push block 41 and the upper mold assembly 1 is S, the thickness of the ejector plate 43 is D, the height of the first protrusion 432 is H1, the height of the second protrusion 412 is H2, and the thickness of the material strip 5 is B, wherein S≥D+H1+H2+B.

[0050] In this embodiment, by setting the spacing S between the side push block and the upper mold assembly, and ensuring that S is greater than the sum of the ejector plate thickness D, the first protrusion height H1, the second protrusion height H2, and the strip thickness B, the interference between the ejector plate and the side push block during the stamping process can be effectively avoided, ensuring that the ejector pin can smoothly pass through the side push block and accurately press the pin tip of the strip, and leaving space for the ejector plate to float up during stamping. The ejector plate is prevented from colliding or getting stuck, thereby reducing the wear and failure risk of the mold. At the same time, the correct positioning and pressing of the ejector pin to the pin tip of the strip is ensured, thereby improving the manufacturing accuracy and yield rate of the lead frame.

[0051] Further, as a preferred embodiment of the present invention but not a limitation, chamfers 414 are respectively provided on both sides of the first protrusion 432 and the second protrusion 412. In the present embodiment, the chamfers are provided so that when the first protrusion and the second protrusion are converted from a mutually misaligned state to a mutually corresponding abutting state, the relative movement can be smoother, thereby reducing jamming or friction resistance.

[0052] Furthermore, as a preferred implementation mode of the present invention but not a limitation thereof, when the upper mold assembly 1 moves downward relative to the lower mold assembly 2, the die forming insert floating block 233 moves downward to press the material strip 5 into shape; when the upper mold assembly 1 moves upward relative to the lower mold assembly 2, the die forming insert floating block 233 moves upward to separate the material strip 5 from the die forming insert 234.

[0053] In this embodiment, the motion control of the die forming insert floating block can use a more precise drive device such as a cylinder, an electric push rod, a hydraulic cylinder, or a position sensor such as a linear potentiometer 3360, 3361 series to control its motion position and speed, so as to improve the stamping accuracy and reliability. In addition, the structure of the die forming insert and the die forming insert floating block can be improved, such as using self-lubricating materials or surface treatment to reduce friction and wear and extend the service life of the mold. These optimization measures will further improve the performance and production efficiency of the stamping die.

[0054] The working principle of this embodiment is as follows:

[0055] Attached Figure 4-11 As shown, E is the gap between the punch fixed plate and the stripping back plate, F is the gap between the ejector pin and the stripping back plate, G is the gap between the side push block and the ejector plate, J is the distance between the stripping forming active block and the stripping forming insert surface, and K is the gap between the stripping plate and the concave template;

[0056] The first working state is Figure 4 As shown, at this time, E is 8.48mm, F is 0.220mm, G is 0.500mm, J is 0.250mm, and K is 0.000mm; the upper die set is at the bottom dead center, the first convex point of the ejector plate and the second convex point of the side push block are spaced 0.5mm apart, and the ejector is in contact with the stripping and forming movable block;

[0057] The second working state is Figure 5 As shown, at this time, E is 9.48mm, F is 0.720mm, G is 0.000mm, J is 0.250mm, and K is 1.000mm; the upper mold assembly is in a state of 1mm upward on the basis of the first working state, the stripper plate is in contact with the concave mold plate, and the first convex point of the ejector plate and the second convex point of the side push block are in the initial contact state. At this time, the ejector and the stripper forming active block are spaced 0.5mm to provide space when the floating block of the concave mold forming insert drives the material strip to rise, so as to prevent the pressed and formed material strip from being squeezed and deformed, and achieve the effect of delayed stripping;

[0058] The third working state is Figure 6 As shown, at this time, E is 9.48mm, F is 0.720mm, G is 0.000mm, J is 0.250mm, and K is 2.000mm; the upper die set is in a state of 1mm upward on the basis of the second working state, the die forming floating block rises 1mm, the stripper plate sticks to the die forming floating block, the first convex point of the ejector plate and the second convex point of the side push block are in a zero-gap contact state, and the side push column pushes the side push block to start moving to the left;

[0059] The fourth working state is as follows Figure 7As shown, at this time, E is 9.48mm, F is 0.720mm, G is 0.000mm, J is 0.250mm, and K is 3.000mm; the upper die set is in a state of 1mm upward on the basis of the third working state, the die forming floating block stays in the third working state position, the stripper plate is out of contact with the die forming floating block, and the first convex point of the ejector plate and the second convex point of the side push block are in a zero-gap contact state. The side push column pushes the side push block to continue to move to the left;

[0060] The fifth working state is as follows Figure 8 As shown, at this time, E is 9.48mm, F is 0.000mm, G is 0.280mm, J is 0.000mm, and K is 12.00mm; the upper die set is in a state of 9mm upward on the basis of the fourth working state, the die forming floating block stays in the fourth working state position, the stripper plate is away from the contact with the die forming floating block, and the first convex point of the ejector plate is misaligned with the second convex point of the side push block, that is, it falls into the groove of the side push block. The side push column pushes the side push block to continue to move to the left;

[0061] The sixth working state is as follows Fig. 9 As shown, at this time, E is 9.48mm, F is 0.000mm, G is 0.280mm, J is 0.000mm, and K is 17.00mm; the upper mold assembly is in a state of 5mm upward on the basis of the fifth working state, the die forming floating block stays in the fifth mold working state position, the stripper plate is away from the contact with the die forming floating block, and the first convex point of the ejector plate is misaligned with the second convex point of the side push block, that is, in the groove of the side push block. The side push block is in the leftmost position and does not continue to move to the left;

[0062] The seventh working state is as follows Fig.10 As shown, at this time, E is 9.48mm, F is 0.000mm, G is 0.280mm, J is 0.000mm, and K is 25.00mm; the upper mold assembly moves upward to the state of the upper dead center position on the basis of the sixth working state, the die forming floating block stays in the sixth mold working state position, the stripper plate is away from the contact with the die forming floating block, the first convex point of the ejector plate is misaligned with the second convex point of the side push block, that is, it is in the groove of the side push block, and the side push block is in the leftmost position and does not continue to move to the left;

[0063] The eighth working state is as follows Fig.11 As shown, at this time, E is 9.48mm, F is 0.000mm, G is 0.280mm, J is 0.000mm, and K is 2.00mm; the upper mold assembly descends from the top dead center until the stripper plate contacts the die forming lifting block (the die forming lifting block is 1MM higher than the die plate surface). At this time, the stripper plate forming movable block presses the pin to prevent the pin from warping up during molding. The first convex point of the ejector plate is misaligned with the second convex point of the side push block, that is, they are in the groove of the side push block. The side push block is in the leftmost position and does not continue to move to the left.

[0064] 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 for manufacturing a Z-shaped lead frame, characterized in that: The invention comprises an upper die set (1) and a lower die set (2), a stripping die set (3) connected to the upper die set (1) and used for stamping a material strip (5), and a pre-pressing component (4) connected to the upper die set (1) and passing through the stripping die set (3), wherein the pre-pressing component (4) is used for pressing the pin tips of the material strip (5) before stamping, and the pre-pressing component (4) slides up and down relative to the stripping die set (3).

2. A stamping die for manufacturing a Z-shaped lead frame according to claim 1, characterized in that: The pre-pressing assembly (4) comprises a side push block (41) slidably connected to the upper mold assembly (1) in a horizontal direction, a side push column (42) connected to the lower mold assembly (2) and through which the upper mold assembly (1) passes, and an ejector plate (43) located on the inner side of the side push block (41) and connected to the upper mold assembly (1), wherein an ejector pin (431) is provided on the ejector plate (43), and a stripping forming insert (31) and a stripping forming movable block (32) slidably connected to the stripping forming insert (31) are provided on the stripping module (3), and the ejector pin (431) passes through the side push block (41) and the stripping module (3) in sequence and abuts against or separates from the stripping forming movable block (32).

3. A stamping die for manufacturing a Z-shaped lead frame according to claim 2, characterized in that: The side thrust column (42) is provided with a first inclined surface (421), the side thrust block (41) is provided with a second inclined surface (411) matched with the first inclined surface (421), the ejector plate (43) is provided with a first protrusion (432), the side thrust block (41) is provided with a second protrusion (412), the ejector plate (43) is connected to the upper mold assembly (1) via an ejector spring (433), and the upper mold assembly (1) is connected to a side of the side thrust block (41) away from the side thrust column (42) via a side thrust spring (413).

4. A stamping die for manufacturing a Z-shaped lead frame according to claim 3, characterized in that: When the upper mold assembly (1) moves upward relative to the lower mold assembly (2), the first inclined surface (421) and the second inclined surface (411) cooperate to drive the second protrusion (412) and the first protrusion (432) to be misaligned, so that the ejector plate (43) is close to the side push block (41), and then the ejector (431) pushes the stripping forming movable block (32) to the bottom of the stripping forming insert (31); when the upper mold assembly (1) moves downward relative to the lower mold assembly (2), the first inclined surface (421) and the second inclined surface (411) cooperate to drive the second protrusion (412) and the first protrusion (432) to be abutted against each other, so that the ejector plate (43) is away from the side push block (41), and then the ejector (431) is separated from the stripping forming movable block (32).

5. A stamping die for manufacturing a Z-shaped lead frame according to claim 4, characterized in that: The upper die assembly (1) comprises an upper die base (11), an upper pad (12) and a punch fixing plate (13) which are connected in sequence from top to bottom; the stripping die assembly (3) comprises a stripping back plate (33) and a stripping plate (34); the lower die assembly (2) comprises a lower die base (21), a lower pad (22) and a concave die plate (23) which are connected in sequence from bottom to top; a suspension assembly (14) is movably connected to the upper die base (11) and passes through the upper pad (12) and the punch fixing plate (13) and is connected to the stripping back plate (33); an upper die limit column (15) is provided on the upper die base (11); and a lower die limit column (24) corresponding to the upper die limit column (15) is provided on the lower die base (21).

6. A stamping die for manufacturing a Z-shaped lead frame according to claim 5, characterized in that: The concave mold plate (23) is provided with a concave mold forming insert pad (231), a concave mold forming insert fixing block (232), a concave mold forming insert floating block (233), and a concave mold forming insert (234) which is provided on the concave mold forming insert pad (231) and passes through the concave mold forming insert fixing block (232) and the concave mold forming insert floating block (233) in sequence upwards, and the concave mold forming insert floating block (233) is arranged along the concave mold forming insert (2 34) When the die forming insert (234) slides upward relative to the die forming insert fixing block (232), the top of the die forming insert (234) sinks into the die forming insert floating block (233); when the die forming insert floating block (233) slides downward along the die forming insert (234) relative to the die forming insert fixing block (232), the top of the die forming insert (234) protrudes from the upper surface of the die forming insert floating block (233).

7. A stamping die for manufacturing a Z-shaped lead frame according to claim 6, characterized in that: The stripping and forming movable block (32) cooperates with the die forming insert (234) to press the pin tip of the material strip (5) before stamping and forming, and the stripping and forming insert (31) cooperates with the die forming insert floating block (233) to stamp and form the material strip (5).

8. A stamping die for manufacturing a Z-shaped lead frame according to claim 3, characterized in that: The spacing distance between the side push block (41) and the upper mold assembly (1) is S, the thickness of the ejector plate (43) is D, the height of the first protrusion (432) is H1, the height of the second protrusion (412) is H2, and the thickness of the material strip (5) is B, wherein S≥D+H1+H2+B.

9. A stamping die for manufacturing a Z-shaped lead frame according to claim 3, characterized in that: Chamfers (414) are respectively provided on both sides of the first protrusion (432) and the second protrusion (412).

10. A stamping die for manufacturing a Z-shaped lead frame according to claim 6, characterized in that: When the upper mold assembly (1) moves downward relative to the lower mold assembly (2), the die forming insert floating block (233) moves downward to press the material strip (5) into shape; when the upper mold assembly (1) moves upward relative to the lower mold assembly (2), the die forming insert floating block (233) moves upward to separate the material strip (5) from the die forming insert (234).

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