Multi-station blanking and one-bending continuous die and processing method

Abstract

This application relates to a multi-station punching and one-time bending continuous die and processing method, belonging to the field of continuous die technology. The continuous die includes a lower die mechanism, comprising a lower die base, a concave die plate disposed on the lower die base, and a guide frame disposed at one end of the lower die base; and an upper die assembly, comprising an upper die base and an upper die assembly, the upper die assembly being provided with several sets of punches, a first cutting punch, a bending punch, and a second cutting punch; the upper die assembly is provided with a first control component and a second control component. The first control component controls the bending punch and the first cutting punch to move synchronously toward the concave die plate, and the second control component controls the second cutting punch to move toward the concave die plate. After the punches have punched ten times consecutively, the first control component drives the bending punch and the first cutting punch to punch synchronously with the punches, forming the bent portion in one step. This application effectively alleviates problems such as tilting and twisting of the strip during continuous punching.

Description

Technical Field

[0001] This application relates to the field of precision progressive die design technology, and in particular to multi-station punching and one-time bending continuous dies and processing methods. Background Technology

[0002] With the rapid development of information technology, many fields such as automotive electronics, home appliances, and industrial equipment are accelerating their digital and intelligent upgrades. Against this backdrop, the application scope of high-performance microprocessors is constantly expanding, and market demand continues to grow significantly. Among these components, the leadframe is a core component of the microprocessor, primarily serving three key functions: supporting the chip, enabling external circuit connections, and heat dissipation. As circuit integration continues to increase, the performance requirements for the leadframe are also becoming increasingly stringent.

[0003] Instruction manual attached Figure 1 Two sets of symmetrical lead frames 3 are formed by progressive die machining. Each lead frame 3 has ten lead regions along its length, and each lead region includes two sets of symmetrical unit regions. Each unit region includes an inner machining section 31, an outer machining section 32, and a bending section 33. Complex product features, such as inner leads, outer leads, dovetail grooves, heat dissipation holes, and scribing lines, are present on the inner machining section 31 and the outer machining section 32, as well as between adjacent unit regions. The bending section 33 is located between the inner machining section 31 and the outer machining section 32. Due to the presence of the bending section 33, the inner machining section 31 and the outer machining section 32 are located on two parallel planes. Currently, progressive dies commonly employ a distributed bending process when machining lead frames. This bending process relies on multiple sets of bending punches to punch the bending section from a horizontal state to an inclined shape in stages, resulting in the inner and outer machining sections being on two parallel planes.

[0004] However, the step-by-step bending process used in the lead frame is prone to uneven stress and insufficient feeding stability, leading to cumulative deviations in the strip between consecutive forming stations. These deviations can cause geometric defects such as product warping and twisting, which not only significantly reduces the consistency of dimensional accuracy and geometric tolerances, but also ultimately makes it difficult to meet the stringent requirements of high precision and high stability for the lead frame. Summary of the Invention

[0005] In order to alleviate the tilting and twisting of the strip during continuous stamping and improve the yield of finished products, this application provides a multi-station punching and one-time bending continuous die and processing method.

[0006] The multi-station punching and one-time bending continuous die and processing method provided in this application adopt the following technical solution: Firstly, a multi-station punching and one-time bending continuous die, a lower die mechanism, including a lower die base, a concave die plate disposed on the lower die base and used for horizontal arrangement of the strip, and a guide frame disposed at one end of the lower die base and used for driving the strip to step forward and convey. The upper mold assembly includes an upper mold base and an upper mold assembly, wherein a plurality of processing punches, a first cutting punch, a bending punch and a second cutting punch are sequentially arranged on the upper mold assembly; The upper die assembly is provided with a first control component and a second control component. The first control component controls the bending punch and the first cutting punch to move synchronously toward the concave die, and the second control component controls the second cutting punch to move toward the concave die. After the processing punch has been punched ten times in a row, the first control component drives the bending punch and the first cutting punch to punch synchronously with the processing punch, forming the bending part in one step.

[0007] By adopting the above technical solution, the concave template is used to horizontally arrange the strip, the guide frame drives the strip to step forward and convey it, the processing punch on the upper die assembly can complete the punching, dovetail groove forming, scribing, and edge trimming of the strip, completing the pre-processing of the strip before bending, the first cutting punch can cut the bent part of the strip, the bending punch can form the bent part in one step, the second cutting punch can further cut the product, so that the product is separated; the first control component controls the bending punch and the first cutting punch to move synchronously, and after the processing punch punches ten times continuously, the first control component drives the bending punch and the first cutting punch to punch synchronously with the processing punch, so as to realize the product forming bending in one step, alleviate the strip tilting and twisting caused by gradual bending, improve the product yield and production efficiency, and the second control component controls the second cutting punch to punch and achieve the separation of the lead frame.

[0008] Optionally, the first cutting punch corresponds to the inner processing part of the adjacent unit region, and the second cutting punch corresponds to the outer processing part of the adjacent unit region.

[0009] By adopting the above technical solution, the first cutting punch can accurately cut the strip corresponding to the inner processing part of the adjacent unit area, completing the first cut and facilitating bending operations; the second cutting punch can accurately cut the strip corresponding to the outer processing part of the adjacent unit area, completing the final cut and realizing the separation of the lead frame and the strip. The above cutting punch setting realizes the accurate punching of the strip, improving product accuracy and production yield.

[0010] Optionally, the bending punch has a bending surface corresponding to the bending portion, a first pressing surface corresponding to the outer processing portion, and a second pressing surface corresponding to the inner processing portion, and the die is provided with a bending die corresponding to the bending punch.

[0011] By adopting the above technical solution, the bending punch can bend the inner processing part of the strip, and the pressing surface can press the outer processing part during bending. When the bending surface is stamped, the inner processing part automatically shrinks towards the outer processing part, realizing one-time forming of the bending part. At the same time, it can alleviate the tilting and twisting of the strip caused by gradual bending, and improve product yield and production efficiency.

[0012] Optionally, the upper die holder is fixed with a stripper plate for abutting against the external processing part. The stripper plate has a clearance through hole corresponding to the bending punch. When the upper die holder moves downward, the stripper plate presses against the external processing part to achieve material strip positioning.

[0013] By adopting the above technical solution, the setting of the stripper plate allows the outer processing part to be pressed and positioned before bending and stamping, so that when the bending punch moves down, the inner processing part automatically retracts towards the outer processing part, thereby improving the forming quality and efficiency.

[0014] Optionally, the first control component includes a control cylinder fixed to the upper die base and a cylinder draw plate disposed at the output end of the control cylinder. The cylinder draw plate is provided with drive grooves spaced apart on the side facing the first cutting punch and the bending punch. The first cutting punch and the bending punch are each provided with drive protrusions that cooperate with the drive grooves. The upper die assembly is provided with a reset elastic element connecting the first cutting punch and the bending punch. When the drive protrusions are arranged in the drive grooves, there is a gap between the first cutting punch and the bending punch and the strip. When the control cylinder drives the cylinder draw plate to move, the drive grooves drive the drive protrusions toward the strip to perform cutting and bending.

[0015] By adopting the above technical solution, the control cylinder drives the cylinder plate to move, and the drive groove drives the drive protrusion to move the first cutting punch and the bending punch towards the strip, which can realize the cutting and bending operations. Moreover, the reset elastic element makes it easy to reset the first cutting punch and the bending punch after the operation. When the drive protrusion and the drive groove are aligned, there is a gap between the first cutting punch and the bending punch and the strip, which ensures the stability and reliability of the mold operation, realizes one-time forming of the bending part, alleviates the tilting and twisting of the strip, and improves the product yield and production efficiency.

[0016] Optionally, the upper die holder is further provided with a bending and shaping punch and a straightening mechanism between the bending punch and the second cutting punch, and the bending and shaping punch and the straightening mechanism are stamped synchronously with the processing punch.

[0017] By adopting the above technical solution, a bending and shaping punch and a straightening mechanism are set between the bending punch and the second cutting punch and are stamped synchronously with the processing punch. This allows for timely preliminary correction and shaping of the strip after bending, alleviating the tilting and twisting of the strip, improving product processing accuracy and yield, and thus increasing production efficiency.

[0018] Secondly, a method for processing a lead frame, applied to the aforementioned multi-station punching and one-time bending continuous die, includes the following steps: S1: Initial material positioning, the strip is precisely guided by the groove on the die to prevent vertical displacement of the strip in the width direction; S2: Pre-punching of strip, pre-punching holes in the strip using a punching punch; S3: Forming dovetail groove, the dovetail groove is stamped on the strip by the dovetail groove punch; S4: Forming hooked edges, the hooked edges are stamped on the strip by the hooked edge punch; S5: Stamping U-shaped scribe lines, U-shaped scribe lines are stamped on the strip using a scribe line punch; S6: First trimming, the trimming punch trims the outer edge of the strip; S7: Punch inner lead, the inner lead is punched out of the strip by the punching punch; S8: Punch external leads, punching external leads out of the strip through a punching punch; S9: Punch heat dissipation holes. Heat dissipation holes are punched out on the strip through a punching punch to form the shape of the base island. S10: Precision pressing of hooked edges and weld points, using a punch to precisely press the hooked edges and weld points of the strip; S11: Shaped strip, the strip is shaped as a whole by a shaping mechanism; S12: Second trimming, the trimming punch trims the outer edge of the strip; S13: First cut, the strip is cut by the first cutting punch; S14: Bending and forming, forming the bent part in one step using a bending punch; S15: Bending and shaping, correcting the product after bending; S16: Twisting, bending, and step correction, using four sets of correction mechanisms to reshape and correct the lead frame; S17: Second cut, the lead frame is cut through the second cutting punch.

[0019] By adopting the above technical solution, using a multi-station punching and one-time bending continuous die, the strip is processed sequentially, including initial material positioning, pre-punching, forming dovetail grooves, forming hooked edges, stamping U-shaped engravings, first edge trimming, punching inner leads, punching outer leads, punching heat dissipation holes, precision pressing of hooked edges and solder joints, shaping the strip, second edge trimming, first cutting, bending and forming, bending and shaping, straightening, and final cutting. The above processing can form the bending parts in one go, alleviate the tilting and twisting of the strip caused by gradual bending, and improve product yield and production efficiency.

[0020] Optionally, the punches operating in S2-S12 operate at the same frequency. In S14, the stamping frequency of the bending punch is 1:10 with that of the punches operating in S2-S12.

[0021] By adopting the above technical solution, the stamping frequency of the bending punch and the stamping frequency of the punching punch are 1:10. After the punching punch has stamped ten times continuously, the bending punch and the punching punch can be driven to stamp synchronously through the first control component. The inner processing part shrinks towards the outer processing part, and the bending part is formed in one step. This alleviates the tilting and twisting of the strip caused by gradual bending, and improves the product yield and production efficiency.

[0022] Optionally, in S13 and S14, the first control element controls the first cutting punch and the bending punch to punch simultaneously.

[0023] By adopting the above technical solution, the first controller independently controls the bending punch, which can alleviate the tilting and twisting of the strip caused by gradual bending, improve the product processing accuracy and yield, and increase production efficiency. After the punching punch has been punched ten times in a row, it can be punched synchronously with the first cutting punch and the bending punch to form the bending part in one go.

[0024] Optionally, in S13, the first cutting punch corresponds to the inner machining part of the adjacent unit region; in S17, the second cutting punch corresponds to the outer machining part of the adjacent unit region.

[0025] By adopting the above technical solution, in S13, the first cutting punch corresponds to the inner processing part of the adjacent unit area, and in S17, the second cutting punch corresponds to the outer processing part of the adjacent unit area, so that the inner processing part and the outer processing part of the strip can be accurately cut.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The multi-station punching and one-time bending continuous die is adopted. The bending punch and the first cutting punch are driven to punch synchronously through the first control component. The punching frequency is matched with the punching punch. The bending part is formed in one step, which alleviates the situation of material strip tilting and twisting caused by gradual bending and improves product yield. The bending punch and the first cutting punch punch simultaneously, so that the inner processing part shrinks towards the outer processing part during bending, which can realize the bending part in one step. By setting a bending and shaping punch and a straightening mechanism between the bending punch and the second cutting punch, and punching them synchronously with the punching punch, the lead frame can be shaped and straightened in time after bending, thereby further improving the product processing accuracy and yield. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the material strip after processing according to an embodiment of this application.

[0028] Figure 2 This is a cross-sectional schematic diagram of the lead frame according to an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the structure of the mold mechanism in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the upper mold mechanism in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the structure of the first control component and the bending punch in the embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the bending punch and bending die in an embodiment of this application.

[0033] Figure 7 This is a schematic diagram of the structure of the correction mechanism in the embodiment of this application.

[0034] Figure 8 This is a schematic diagram of the structure of the strip after processing at the first cutting punch according to an embodiment of this application.

[0035] Explanation of reference numerals in the attached drawings: 1. Lower die mechanism; 11. Lower die base; 12. Die plate; 121. Bending die; 13. Guide frame; 2. Upper die mechanism; 21. Upper die base; 211. Stripper plate; 2111. Clearance through hole; 22. Upper die assembly; 221. Reset elastic element; 23. Punch; 24. First cutting punch; 25. Bending punch; 251. Bending surface; 252. First clamping surface; 253. Second clamping surface. Surface; 254, driving protrusion; 26, second cutting punch; 27, first control component; 271, control cylinder; 272, cylinder draw plate; 2721, driving groove; 2722, inclined surface; 28, second control component; 29, bending and shaping punch; 210, straightening mechanism; 2101, shaping block; 2102, inclined push block; 3, lead wire frame; 31, internal machining part; 32, external machining part; 33, bending part. Detailed Implementation

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0037] The following is in conjunction with the appendix Figure 3-6 This application will be described in further detail.

[0038] Reference Figure 3 and Figure 4 This application discloses a multi-station punching and one-time bending continuous die, including a lower die mechanism 1 and an upper die mechanism 2. The lower die mechanism 1 includes a lower die base 11, a concave die plate 12 disposed on the lower die base 11 for horizontal arrangement of the strip, and a guide frame 13 disposed at one end of the lower die base 11 for conveying the strip.

[0039] The upper die mechanism 2 includes an upper die base 21 and an upper die assembly 22. Along the conveying direction of the strip, the upper die assembly 22 is sequentially equipped with a punch 23, a first cutting punch 24, a bending punch 25, and a second cutting punch 26. In this embodiment, the upper die assembly 22 is provided with several sets of punches 23, used to progressively process features such as through holes, dovetail grooves, hooked edges, engraving lines, and inner and outer leads on the lead frame 3.

[0040] Specifically, the upper die assembly 22 has eleven sets of punches 23 between the first cutting punch 24 and the guide frame 13. The first set of punches 23 is used for pre-punching holes in the strip, specifically as punching punches; the second set of punches 23 is used for punching dovetail grooves, specifically as dovetail groove punches; the third set of punches 23 is used for forming hooked edges, specifically as hooked edge punches; the fourth set of punches 23 is used for punching U-shaped engravings, specifically as engraving punches; the fifth set of punches 23 is used for the first trimming of the outer side of the strip, specifically as trimming punches; the sixth set of punches 23 is used for punching inner leads, specifically as punching punches; the seventh set of punches 23 is used for punching outer leads, specifically as punching punches; the eighth set of punches 23 is used for punching heat dissipation holes, specifically as punching punches; the ninth set of punches 23 is used for precision pressing of hooked edges; the tenth set of punches 23 is used for shaping the strip, specifically as a shaping mechanism, correcting the center distance between the leads and the base island; the eleventh set of punches 23 is used for the second trimming of the outer side of the strip, specifically as trimming punches. The upper die assembly achieves synchronous punching of eleven sets of punches 23 through a hydraulic drive system. Each set of punches 23 processes only one set of lead wire areas during operation.

[0041] The upper die assembly 22 is equipped with a first control element 27 and a second control element 28. The die plate 12 includes a bending die 121. The first control element 27 controls the bending punch 25 and the first cutting punch 24 to simultaneously punch towards the bending die 121 on the lower die base 11, so as to simultaneously achieve the first cutting of the strip to be bent and achieve a one-time bending. The second control element 28 controls the downward punching of the second cutting punch 26 to achieve the second cutting of the strip, that is, to achieve the separation of the lead frame 3.

[0042] The horizontal length of the bending punch 25 is the same as the length of the 10 lead wire areas, meaning that the bending punch 25 can bend the lead wire frame 3 in one go. Compared with the existing step-by-step bending method, this application reduces the probability of tilting or twisting of the lead wire frame 3, and improves the stability of product conveying and the yield of finished products.

[0043] Combination Figure 4 , Figure 5 and Figure 6 The first cutting punch 24 corresponds to the base island of the inner processing section 31 in the adjacent unit area. The bending punch 25 corresponds to the 10 sets of inner processing sections 31 of the lead frame 3. The bending punch 25 has a bending surface 251 corresponding to the bending portion 33, a first pressing surface 252 corresponding to the outer processing section 32, and a second pressing surface 253 corresponding to the inner processing section 31.

[0044] The upper die holder 21 is also fixed with a stripper plate 211 for abutting the strip. The stripper plate 211 has a clearance through hole 2111 corresponding to the bending punch 25 and an abutment surface for pressing against the outer machining part 32. Before the bending operation, the abutment surface is flush with the second pressing surface 253 of the bending punch 25.

[0045] When the bending operation is performed, the upper die holder 21 drives the first cutting punch 24, the bending punch 25 and the stripper plate 211 to move downwards. The stripper plate 211 abuts against the outer processing part 32 to position the strip. The first control component 27 is activated, and the first cutting punch 24 cuts off the adjacent unit area from the inner processing part 31. As the bending punch 25 moves downwards, the inner processing part 31 naturally shrinks towards the outer processing part 32. The bending surface 251 gradually fits into the bending part 33. Finally, the two sets of pressing surfaces press against the inner processing part 31 and the outer processing part 32 to achieve one-time forming of the bending part 33.

[0046] The bending punch 25 and several sets of punches 23 are stamped synchronously in the upper die assembly 22. However, the bending punch 25 controls its gap with the strip under the action of the first control component 27, so that after the punch 23 is punched, there is still a gap between the bending punch 25 and the strip and no actual bending action is performed.

[0047] In this application, the stamping frequency of the punch 23, the first cutting punch 24, and the bending punch 25 is 10:1. That is, after each set of punches 23 completes ten stamping operations, during the eleventh stamping operation, the first control member 27 controls the first cutting punch 24 and the bending punch 25 to move toward the strip to perform cutting and bending operations.

[0048] The first control component 27 includes a control cylinder 271 fixed to the upper die base 21 and a cylinder draw plate 272 connected to the output end of the control cylinder 271. In this embodiment, the upper die base 21 is provided with five sets of control cylinders 271, and the output ends of the five sets of control cylinders 271 are all fixed with cylinder draw plates 272. The five sets of control cylinders 271 are synchronously driven by hydraulic solenoid valves to ensure the stability of the first cutting punch 24 and the bending punch 25 during movement. The five sets of control cylinders 271 are arranged on opposite sides of the upper die base 21, with adjacent control cylinders 271 staggered. The upper die assembly 22 is provided with a reset elastic element 221 connecting the bending punch 25 and the first cutting punch 24. The reset elastic element 221 is a compression spring used to reset the bending punch 25 after punching.

[0049] The cylinder pull plate 272 is horizontally inserted into the upper die assembly 22, and is located on top of the first cutting punch 24 and the bending punch 25. Two sets of drive grooves 2721 are spaced apart on the side of the cylinder pull plate 272 facing the bending punch 25, and inclined surfaces 2722 are provided on opposite sides of the drive grooves 2721. The top of the bending punch 25 has a drive protrusion 254 that matches the drive groove 2721. When the drive groove 2721 and the drive protrusion 254 correspond, the bending punch 25 is in an unstamped state. When the cylinder pull plate 272 moves horizontally, the drive protrusion 254 gradually moves towards the lead frame 3 under the action of the inclined surface 2722. After the cylinder pull plate 272 resets, the bending punch 25 automatically resets under the action of the elastic element in the upper die assembly 22, and the drive groove 2721 and the drive protrusion 254 re-engage.

[0050] The engagement method of the second control member 28 and the second cutting punch 26 is the same as that of the first control member 27 and the first cutting punch 24, and will not be described in detail in this embodiment. The second cutting punch 26 corresponds to the external processing part 32 of the adjacent unit area and is used to separate the bent lead frame 3 from the strip. The starting frequency of the second control member 28 is the same as that of the first control member 27, so that two sets of lead frames 3 are finally output from the end of the lower die holder 11.

[0051] Reference Figure 6 and Figure 7 To further improve the bending quality of the lead frame 3, the upper die assembly 22 is further provided with a bending and shaping punch 29 and a straightening mechanism 210 between the bending punch 25 and the second cutting punch 26. The upper die assembly 22 has four sets of straightening mechanisms 210 installed along the processing direction to sequentially perform twisting, bending, and pitch correction on the outer processing part 32 of the unit area. The straightening mechanism 210 includes a shaping block 2101 disposed on the upper die assembly 22 and a slope push block 2102 disposed on the concave die plate 12 and corresponding to the shaping block.

[0052] Reference Figure 8 The figure shows the structural diagram of the lead frame after cutting and bending at the first cutting punch 24. Area A is the structural diagram of the lead frame after cutting and bending, and area B is the structural diagram of the lead frame after punching and shaping.

[0053] A method for fabricating a lead frame, comprising the following steps: S1: Initial material positioning, the strip is precisely guided by the groove on the die to prevent vertical displacement of the strip in the width direction; S2: Pre-punching of strip, pre-punching holes in the strip using a punching punch; S3: Forming dovetail groove, the dovetail groove is stamped on the strip by the dovetail groove punch; S4: Forming hooked edges, the hooked edges are stamped on the strip by the hooked edge punch; S5: Stamping U-shaped scribe lines, U-shaped scribe lines are stamped on the strip using a scribe line punch; S6: First trimming, the trimming punch trims the outer edge of the strip; S7: Punch inner lead, the inner lead is punched out of the strip by the punching punch; S8: Punch external leads, punching external leads out of the strip through a punching punch; S9: Punch heat dissipation holes. Heat dissipation holes are punched out on the strip through a punching punch to form the shape of the base island. S10: Precision pressing of hooked edges and weld points, using a punch to precisely press the hooked edges and weld points of the strip; S11: Shaped strip, the strip is shaped as a whole by a shaping mechanism; S12: Second trimming, the trimming punch trims the outer edge of the strip; S13: First cut, the strip is cut by the first cutting punch; S14: Bending and forming, forming the bent part in one step using a bending punch; S15: Bending and shaping, correcting the product after bending; S16: Twisting, bending, and step correction, using four sets of correction mechanisms to reshape and correct the lead frame; S17: Second cut, the lead frame is cut through the second cutting punch.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for fabricating a lead frame, characterized in that, The process employs a multi-station punching and continuous bending die, the die comprising: The lower die mechanism includes a lower die base, a concave die plate disposed on the lower die base for horizontal arrangement of the strip, and a guide frame disposed at one end of the lower die base for driving the strip to step forward and convey. The upper die mechanism includes an upper die base and an upper die assembly. The upper die assembly is sequentially provided with several sets of processing punches, a first cutting punch, a bending punch, and a second cutting punch. The upper die assembly is equipped with a first control component and a second control component. The first control component controls the bending punch and the first cutting punch to punch towards the concave die plate simultaneously. The second control component controls the second cutting punch to punch towards the concave die plate. After the processing punch punches ten times in a row, the first control component drives the bending punch and the first cutting punch to punch synchronously with the processing punch, forming the bending part in one step. The processing method includes the following steps: S1: Initial material positioning, the strip is precisely guided by the groove on the die to prevent vertical displacement of the strip in the width direction; S2: Pre-punching of strip, pre-punching holes in the strip using a punching punch; S3: Forming dovetail groove, the dovetail groove is stamped on the strip by the dovetail groove punch; S4: Forming hooked edges, the hooked edges are stamped on the strip by the hooked edge punch; S5: Stamping U-shaped scribe lines, U-shaped scribe lines are stamped on the strip using a scribe line punch; S6: First trimming, the trimming punch trims the outer edge of the strip; S7: Punch inner lead, the inner lead is punched out of the strip by the punching punch; S8: Punch external leads, punching external leads out of the strip through a punching punch; S9: Punch heat dissipation holes. Heat dissipation holes are punched out on the strip through a punching punch to form the shape of the base island. S10: Precision pressing of hooked edges and weld points, using a machining punch to precision press the hooked edges and weld points of the strip; S11: Shaped strip, the strip is shaped as a whole by a shaping mechanism; S12: Second trimming, the trimming punch trims the outer edge of the strip; S13: First cut, the strip is cut by the first cutting punch; S14: Bending and forming, forming the bent part in one step using a bending punch; S15: Bending and shaping, correcting the product after bending; S16: Twisting, bending, and step correction, using four sets of correction mechanisms to reshape and correct the lead frame; S17: Second cut, the lead frame is cut through the second cutting punch.

2. The processing method according to claim 1, characterized in that, The first cutting punch corresponds to the inner processing part of the adjacent unit region, and the second cutting punch corresponds to the outer processing part of the adjacent unit region.

3. The processing method according to claim 2, characterized in that, The bending punch has a bending surface corresponding to the bending part, a first pressing surface corresponding to the outer processing part, and a second pressing surface corresponding to the inner processing part. The die plate is provided with a bending die corresponding to the bending punch.

4. The processing method according to claim 2, characterized in that, The upper die base is fixed with a stripper plate for abutting the external processing part. The stripper plate has a clearance through hole corresponding to the bending punch. When the upper die base moves downward, the stripper plate presses against the external processing part to achieve material strip positioning.

5. The processing method according to claim 1, characterized in that, The first control component includes a control cylinder fixed to the upper die base and a cylinder draw plate disposed at the output end of the control cylinder. The cylinder draw plate is provided with a drive groove spaced apart on the side facing the first cutting punch and the bending punch. The first cutting punch and the bending punch are each provided with a drive protrusion that cooperates with the drive groove. The upper die assembly is provided with a reset elastic element connecting the first cutting punch and the bending punch. When the drive protrusion is arranged in the drive groove, there is a gap between the first cutting punch and the bending punch and the strip. When the control cylinder drives the cylinder draw plate to move, the drive groove drives the drive protrusion to move in the direction of the strip to perform cutting and bending.

6. The processing method according to claim 1, characterized in that, The upper die holder is further provided with a bending and shaping punch and a straightening mechanism between the bending punch and the second cutting punch. The bending and shaping punch and the straightening mechanism are stamped synchronously with the stamping punch.

7. The processing method according to claim 1, characterized in that, The processing punch operates at the same frequency in steps S2-S12, and in step S14, the ratio of the stamping frequency of the bending punch to the stamping frequency of the processing punch is 1:

10.

8. The processing method according to claim 1, characterized in that, In steps S13 and S14, the first control unit controls the first cutting punch and bending punch to punch synchronously.

9. The processing method according to claim 1, characterized in that, In step S13, the first cutting punch corresponds to the inner processing part of the adjacent unit region; in step S17, the second cutting punch corresponds to the outer processing part of the adjacent unit region.

Images