Copper tape flattening device behind lead frame of punched chip

Abstract

The utility model discloses a copper band flattening device behind lead frame of stamping chip, including frame and copper band passageway with copper band entrance, copper band export, frame front end has copper band drive wheel subassembly, and the circumferential surface of copper band drive wheel in copper band drive wheel subassembly has multiple radial convex post that set up along the circumference interval and with copper band multiple punch card is combined, and the frame rear end has copper band taut mechanism when copper band drive wheel stops and presses tightly and taut copper band, and the frame of immediately adjacent copper band drive wheel subassembly has first flattening mechanism including a lining plate and multiple punches and is used for the first flattening mechanism of copper band punch edge roll -over part, and the frame of immediately adjacent first flattening mechanism has second flattening mechanism including a lining plate and multiple punches and is used for the second flattening mechanism of copper band punch edge roll -over part. The device is strong to the roll -over part such as big flanging and small burr of punch edge, and force is concentrated, and the effect of punch and flattening is good and relatively saves energy consumption.

Description

Technical Field

[0001] This utility model relates to the technical field of copper strip recycling equipment, specifically a copper strip flattening device after stamping the lead frame of a chip. Background Technology

[0002] The lead frame of a chip is typically formed by repeatedly stamping the desired shape onto a copper strip, also known as a copper strip. The stamped copper strip has multiple rows of through-holes arranged along its length, such as oblong through-holes on both sides and rectangular through-holes in the middle. The two rows of oblong through-holes somewhat resemble the shape of film reels. The copper strip used to stamp the chip lead frame is generally recycled.

[0003] In the actual recycling process, the rolled-up parts with the stamping holes facing downwards or upwards, such as large rolled edges and small burrs, must be flattened. Otherwise, problems such as loosening, wrinkling or delamination may occur in the copper strip during subsequent winding, such as when using a winding device. This will affect the flatness and winding quality of the wound copper strip and hinder the effectiveness of subsequent recycling.

[0004] However, existing technologies for flattening the downward or upward curled portions of the copper strip's stamped edges, such as large curls and small burrs, all employ at least one, and usually multiple, pressure rollers. In production practice, this pressure roller flattening method has the following shortcomings: 1. The curled portions of the stamped edges, such as large curls and small burrs, occupy only a small portion of the copper strip area. Using large-area pressure rollers with evenly distributed force results in poor compaction after rolling, and the phenomenon of the curled portions, such as large curls and small burrs, rebounding and opening up is quite common. 2. To flatten the small portion of the copper strip's curled edges and burrs, multiple high-power motors are required, leading to relatively high energy consumption. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a copper strip flattening device for the lead frame of a stamped chip that is highly targeted at the rolled portion of the punched edge, such as large rolled edges and small burrs, with concentrated force, good punching and flattening effect, and relatively energy saving.

[0006] The technical solution of this utility model is to provide a copper strip flattening device after stamping the lead frame of a chip, including a frame and a copper strip channel with a copper strip inlet and a copper strip outlet; The front end of the frame has a copper belt drive wheel assembly. The copper belt drive wheel in the assembly has multiple radial protrusions on its circumferential surface that are spaced along the circumference and engage with multiple punches in the copper belt. The rear end of the frame has a copper belt tensioning mechanism that presses and tightens the copper belt when the copper belt drive wheel stops rotating. The frame adjacent to the copper strip drive wheel assembly has a first flattening mechanism including a liner and multiple punches for flattening the rolled-up portion of the copper strip punched edge; The frame adjacent to the first leveling mechanism has a second leveling mechanism, which includes a liner and multiple punches and is used to level the rolled edge of the copper strip punch.

[0007] With the above structure, the copper strip flattening device behind the lead frame of the stamped chip of this utility model has the following advantages: The core invention of this utility model is that the copper strip tensioning mechanism first tensions the copper strip of the section to be flattened, so that the copper strip adheres to the liner plate and the liner plate acts as a rigid abutment against the substrate. Multiple punches, precisely aligned with the positions of the large rolled edges and small burrs at the punching edge, simultaneously and point-to-point flatten the large rolled edges and small burrs. This small-area flattening, rather than the large-area rolling of existing pressure rollers, is highly targeted, precise in positioning, and provides strong pressure and concentrated force, resulting in a good effect of compacting and flattening the large rolled edges and small burrs, while also saving energy. Furthermore, this device is relatively small in size, thus saving on equipment costs.

[0008] Furthermore, both the first and second flattening mechanisms have the following structures: a first cylinder is fixed on the frame away from the liner; a horizontal sliding plate is fixed to the free end of the piston rod of the first cylinder, which is slidably fitted onto the frame; the horizontal sliding plate has an inclined elongated hole; a first vertical sliding plate is vertically fitted onto the frame; one end of the first vertical sliding plate has a sliding post that is slidably fitted into the inclined elongated hole to allow the first vertical sliding plate to slide up and down under the drive of the horizontal sliding plate; the other end of the first vertical sliding plate is fixed to a punch mounting plate; the punch mounting plate has multiple large punches and multiple small punches with downward or upward flipping parts at the edge of the flattening punch. With the above structure, both the first and second flattening mechanisms are simple in structure, stable and reliable in performance, further ensuring accurate positioning, high pressure, concentrated force, good edge and burr compaction and flattening effect, and relatively low energy consumption and equipment costs.

[0009] Furthermore, the punch mounting plate includes a first mounting plate fixed to the other end of the first vertical slide plate and oriented horizontally, and a second mounting plate located away from the first vertical slide plate and oriented horizontally; multiple guide posts are fixed on the first mounting plate; the multiple large punches and multiple small punches are fixed on the second mounting plate, and the second mounting plate has multiple first guide holes for the multiple guide posts to pass through; the liner plate includes a liner plate body fixed on the frame and a guide plate, the guide plate being located on the inner side of the liner plate body, and a copper strip channel for accommodating copper strip and allowing the copper strip to move longitudinally linearly between the liner plate body and the guide plate, the guide plate having multiple second guide holes for the guide posts to slide up and down, multiple large punch guide holes for the multiple large punches to slide up and down, and multiple small punch guide holes for the multiple small punches to slide up and down. With the above structure, it is easier to fix and install the large punch, small punch, guide post and punch mounting plate, easier to install and slide the large punch, small punch and guide post and liner plate, and easier to fit the punch mounting plate with the frame and fix the liner plate with the frame. This makes the up-and-down sliding of the large punch and small punch more flexible, stable and reliable, and further ensures the technical effects of accurate positioning, high pressure, concentrated force, good edge rolling and burr punching and flattening effect, and relatively energy saving.

[0010] Furthermore, both the first and second mounting plates are vertically slidably fitted onto the frame. Multiple compression springs exist between the first and second mounting plates, each spring fitting onto its respective spring mounting post fixed to the first mounting plate. The two ends of the springs abut against the first and second mounting plates respectively. The second mounting plate has spring mounting post holes for the spring mounting posts to slide up and down. This structure makes the first mounting plate's action of pushing the second mounting plate and driving the large and small punches to flatten more flexible, stable, and reliable. The compression springs buffer the punches on the second mounting plate, preventing long-term direct impact that could affect service life. This further ensures precise positioning, high pressure, concentrated force, good edge and burr removal and flattening effects, and relatively energy savings.

[0011] Furthermore, the first leveling mechanism is used to level the downward-curved portion of the punched edge of the copper strip; the second leveling mechanism is used to level the upward-curved portion of the punched edge of the copper strip. With this structure, its advantages are significant: downward-curved portions of the copper strip, such as large downward curls and small downward burrs, are directly compacted and flattened onto the bottom surface of the copper strip by the punch impacting upwards, avoiding the phenomenon of rebound and opening up. Similarly, upward-curved portions of the copper strip, such as large upward curls and small upward burrs, are directly compacted and flattened onto the top surface of the copper strip by the punch impacting downwards, avoiding the phenomenon of rebound and opening up. Moreover, in the actual leveling process, the first and second leveling mechanisms simultaneously press during the one-time tensioning, leveling both the upward and downward curled portions at the same time, significantly improving the leveling efficiency. Furthermore, the first leveling mechanism adjacent to the copper strip drive wheel assembly is used to level the downward-curling portions of the copper strip, such as large downward-facing curls and small downward-facing burrs. This results in a relatively low height at both ends and a relatively high height in the middle of the entire device, facilitating installation and routine maintenance. Furthermore, the copper strip tensioning mechanism includes a slide table that slides longitudinally on the frame. A pad and a vertical second cylinder are fixed on the slide table. Above the pad is the free end of the piston rod of the second cylinder, which is used to press or release the copper strip on the top surface of the pad. The cylinder body of the horizontal third cylinder, used to tension the copper strip, is fixed to the frame, and the free end of the piston rod is fixed to the slide table. With the above structure, the copper strip tensioning mechanism is simple in structure, and the process of pressing and tensioning the copper strip is stable, reliable, flexible, and labor-saving. This further ensures good edge curling and burr compaction and flattening effects while relatively saving energy.

[0012] Furthermore, the vertical cross-sectional shape of the horizontal copper strip channel is rectangular or C-shaped; the height of the copper strip channel is 3 to 4 times the thickness of the horizontal copper strip. This structure not only allows the copper strip to pass conveniently and quickly from the inlet to the outlet, but also helps to initially gather and converge the downward or upward curled edges of the copper strip, further ensuring the technical effect of the large and small punches in smoothing out the curled edges and burrs in one go.

[0013] Furthermore, the first motor driving the copper belt drive wheel and the copper belt drive wheel are both mounted on a second vertical slide plate. The second vertical slide plate is slidably fitted onto the frame. The frame has a fourth cylinder that drives the second vertical slide plate to rise so that the two rows of radial protrusions on the circumference of the copper belt drive wheel engage into the two rows of regularly arranged waist-shaped through holes of the copper belt, or to fall so that the two rows of radial protrusions on the circumference of the copper belt drive wheel disengage from the two rows of regularly arranged waist-shaped through holes of the copper belt. The top of the radial protrusion is tapered to facilitate engagement into the waist-shaped through holes of the copper belt. The horizontal strip seat fixed on the frame has an upward-opening C-shaped copper belt channel. The horizontal strip seat below the copper belt has an elongated through hole extending along the length direction and into which the two side plates of the copper belt drive wheel extend so that the radial protrusions engage with the waist-shaped holes. With the above structure, the radial protrusion of the copper strip drive wheel can be engaged into the waist-shaped through hole of the copper strip according to different needs of the stamping operation process, so as to drive the copper strip forward or tighten the copper strip to facilitate the smoothing of the rolled edge and burrs, or to move the copper strip drive wheel away from the copper strip so that the beginning of the copper strip can enter the copper strip channel from the copper strip inlet and pass through the copper strip outlet, etc. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a preferred embodiment of the copper strip flattening device of this utility model. Figure 1 ( Figures 1-10 (Hinges, pins, bolts, nuts, etc. are not shown).

[0015] Figure 2 This is a schematic diagram of a preferred embodiment of the copper strip flattening device of this utility model. Figure 2 .

[0016] Figure 3 This is a schematic diagram of the copper strip tensioning mechanism in a preferred embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the structure of the second leveling mechanism in a preferred embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of the structure of the first leveling mechanism in a preferred embodiment of the present invention.

[0019] Figure 6 yes Figure 5 Explosion structure diagram Figure 1 .

[0020] Figure 7 yes Figure 5 Explosion structure diagram Figure 2 .

[0021] Figure 8 This is a schematic diagram of the copper strip drive assembly in a preferred embodiment of the present invention (exploding to reveal the horizontal strip seat therein).

[0022] Figure 9 yes Figure 8 The horizontal strip seat in the diagram omits the two top plates and rotates 180°, showing a structural schematic diagram of two long strip-shaped through holes.

[0023] Figure 10 yes Figure 8 A magnified structural diagram of the copper strip after it has been rotated at an angle.

[0024] As shown in the figure: 1. First base plate; 2. Copper strip; 21. Punch hole; 211. Waist-shaped through hole; 212. Rectangular through hole; 3. Leveling mechanism; 31. First leveling mechanism; 32. Second leveling mechanism; 33. Liner plate; 331. First rectangular copper strip channel; 332. Liner plate body; 3321. Third guide hole; 333. Guide plate; 3331. Second guide hole A; 3332. Large punch guide hole A; 3333. Small punch guide hole A; 34. First cylinder; 341. First piston rod; 3411. First free end; 35. Vertical plate; 351. Horizontal rectangular sliding hole; 36. Horizontal sliding plate; 361. Inclined long through hole; 37. First vertical sliding plate; 3 8. Horizontal plate; 381. Vertical rectangular sliding hole; 39. Sliding column; 310. Punch mounting plate; 3101. First mounting plate; 3102. Second mounting plate; 31021. First guide hole; 31022. Compression spring mounting column hole; 311. Support frame; 312. Guide column; 313. Compression spring; 314. Large punch; 315. Small punch; 316. Fixing plate; 3161. Second guide hole B; 3162. Large punch guide hole B; 3163. Small punch guide hole B; 317. Waist-shaped vertical hole; 318. Compression spring mounting column. 4. Copper belt drive wheel assembly; 41. Copper belt drive wheel frame; 411. Vertical slide rail; 42. Copper belt drive wheel; 421. Side plate wheel; 4211. Radial protrusion; 42111. Conical shape; 43. First motor; 44. Second vertical slide plate; 45. Horizontal strip seat; 451. C-shaped copper belt channel; 4511. Copper belt inlet; 452. Long strip through hole; 453. Top plate; 4531. Opening; 46. Fourth cylinder; 5. Copper strip tensioning mechanism; 51. Copper strip tensioning mechanism frame; 511. Second rectangular copper strip channel; 5111. Copper strip outlet; 52. Slide table; 53. Pad plate; 54. Second cylinder; 541. Sliding pressure block; 542. Cylinder seat; 5421. Vertical sliding hole; 55. Third cylinder; 551. Cylinder body; 552. Third piston rod; 5521. Third free end; Detailed Implementation

[0025] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown.

[0027] The present invention is entitled "A device for flattening the copper strip behind the lead frame of a stamped chip," which can also be described as: a device for flattening the copper strip behind the lead frame of a stamped chip. A preferred embodiment of the device for flattening the copper strip behind the lead frame of a stamped chip includes a frame and a copper strip channel with a copper strip inlet 4511 and a copper strip outlet 5111.

[0028] rack such Figure 1 From right to left, the components shown are the copper belt drive wheel frame 41, the frame of the first flattening mechanism 31, the frame of the second flattening mechanism 32, and the copper belt tensioning mechanism frame 51. The copper belt drive wheel frame 41, the frame of the first flattening mechanism 31, and the frame of the second flattening mechanism 32 can be jointly fixed to the same elongated first base plate 1 by multiple bolts. The first base plate 1 can be fixed to the floor by multiple anchor bolts.

[0029] The vertical cross-sectional shape of the horizontal copper strip channel can be rectangular or C-shaped. A rectangle is easy to understand; for example, a horizontally rectangular copper strip channel with a length greater than its height: such as the first rectangular copper strip channel 331 within the liner 33 of the first and second flattening mechanisms 31 and the second rectangular copper strip channel 511 on the copper strip tensioning mechanism 5. The C-shape is only a general shape; strictly speaking, it can be described as a horizontally rectangular channel with a notch on its top plate, the width of which is narrower than the width of the copper strip 2, such as the C-shaped copper strip channel 451 on the top of the copper strip drive wheel frame 41 outside the right end of the first flattening mechanism 31. The height of the copper strip channels, including rectangular channels such as the first rectangular copper strip channel 331 and the second rectangular copper strip channel 511, and the C-shaped copper strip channel 451, can all be 3 to 4 times the thickness of the horizontal copper strip 2. For example, if the copper strip thickness is 2 mm, the copper strip channel thickness can be 6 mm to 8 mm. The copper strip 2 extends horizontally along both the longitudinal and longitudinal directions. Figure 1As shown, the copper strip inlet 4511 can be located at the right end of the C-shaped copper strip channel 451 at the top of the copper strip drive wheel frame 41, and the copper strip outlet 5111 can be located at the left end of the second rectangular copper strip channel 511 on the copper strip tensioning mechanism 5.

[0030] The frame adjacent to the copper strip drive wheel assembly 4, such as the first base plate 1, has a first flattening mechanism 31 including a liner 33 and multiple punches for flattening the edge of the punch 21 of the copper strip 2. The first flattening mechanism 31 can be a flattening mechanism for flattening the downward-curved edge of the punch 21 of the copper strip 2, such as a large downward curl and a small downward burr.

[0031] The frame adjacent to the first flattening mechanism 31, such as the first base plate 1, has a second flattening mechanism 32, which includes a liner plate 33 and multiple punches for flattening the rolled edges of the punched holes 21 of the copper strip 2. The second flattening mechanism 32 can be a flattening mechanism for flattening the upward rolled edges of the punched holes 21 of the copper strip 2, such as large upward rolled edges and small upward burrs. The first flattening mechanism 31 and the second flattening mechanism 32 can be collectively referred to as the flattening mechanism 3.

[0032] It is not difficult to understand that, for large rolled edges of the punched hole 21, the purpose of flattening is to make the rolled edge close to the copper strip 2 and press it flat. For small burrs on the rolled edges of the punched hole 21, the purpose of flattening is to make the burrs flush with the copper strip or close to the copper strip 2 and press them flat.

[0033] The edges of the punched holes 21 are such as the waist-shaped through holes 211 or waist-shaped holes on both sides of the width of the copper strip 2 and the rectangular through holes 212 or rectangular holes in the middle of the width of the copper strip 2.

[0034] The specific structure of the leveling mechanism 3, namely the first leveling mechanism 31 and the second leveling mechanism 32, can be as follows: A first cylinder 34 is fixed on the first base plate 1 of the frame. The free end of the first piston rod 341 of the first cylinder 34, referred to as the first free end 3411, is fixed with a horizontal sliding plate 36 that is horizontally slidably fitted within a horizontal rectangular sliding hole 351 on two vertical plates 35 of the frame. The horizontal sliding plate 36 can be a rectangular sliding plate, and its length dimension can be greater than its height dimension, and its height dimension can be greater than its thickness dimension. The first free end 3411 is fixed to the horizontal sliding plate 36, for example, by using a T-shaped plug and a T-shaped slot for connection and fixation. The horizontal sliding plate 36 has an inclined elongated through hole 361. A first rectangular vertical sliding plate 37 is vertically slidably fitted within a vertical rectangular sliding hole 381 on a horizontal plate 38 of the frame. One end of the first vertical sliding plate 37, such as the lower end of the first flattening mechanism 31 or the upper end of the second flattening mechanism 32, is fixed with a sliding post 39 that is slidably fitted within the inclined elongated through hole 361 to allow the first vertical sliding plate 37 to slide up and down under the drive of the horizontal sliding plate 36. The other end of the first vertical slide plate 37, such as the upper end of the first flattening mechanism 31 or the lower end of the second flattening mechanism 32, is fixed to a punch mounting plate 310, such as by welding. The punch mounting plate 310 is fixed with downward-turned edges of the flattening punch 21, such as multiple downward-facing large rolled edges (e.g., two large punches 314) and multiple downward-facing small burrs (e.g., eight small punches 315); or, the punch mounting plate 310 is fixed with upward-turned edges of the flattening punch 21, such as multiple upward-facing large rolled edges (e.g., two large punches 314) and multiple upward-facing small burrs (e.g., eight small punches 315). It is easy to understand that the large punches 314 and small punches 315, from a cross-sectional perspective, can punch all the turned edges of the two waist-shaped through holes 211 on both sides of the copper strip 2 and the rectangular through hole 212 in the middle. On the two vertical plates 35 perpendicular to each other and having horizontal rectangular sliding holes 351, there may be a waist-shaped vertical hole 317 on each plate to facilitate operation and avoid interference with the sliding column 39. The waist-shaped vertical hole 317 may also be called a vertical waist-shaped hole.

[0035] The punch mounting plate 310 includes a first mounting plate 3101, which is fixed horizontally to the other end of the first vertical slide plate 37 (e.g., the upper end of the first vertical slide plate 37 in the first flattening mechanism 31 or the lower end of the first vertical slide plate 37 in the second flattening mechanism 32), and a second mounting plate 3102, which is horizontally positioned away from the first vertical slide plate 37. In the first flattening mechanism 31, the first mounting plate 3101 is located at the lower part, and the second mounting plate 3102 is located at the upper part of the first mounting plate 3101. In the second flattening mechanism 32, the first mounting plate 3101 is located at the upper part, and the second mounting plate 3102 is located at the lower part of the first mounting plate 3101. Both the first mounting plate 3101 and the second mounting plate 3102 are vertically slidably fitted onto the frame. There are multiple compression springs 313 between the first mounting plate 3101 and the second mounting plate 3102. Each compression spring 313 is fitted onto its respective compression spring mounting post 318 fixed on the first mounting plate 3101. The two ends of the compression spring 313 abut against the first mounting plate 3101 and the second mounting plate 3102 respectively. The second mounting plate 3102 has compression spring mounting post holes 31022 for the compression spring mounting post 318 to slide up and down.

[0036] For ease of manufacture and installation, the first mounting plate 3101 can be composed of two plates, upper and lower, which can be connected by screws and threaded holes to form the first mounting plate 3101. The second mounting plate 3102 can also be composed of two plates, upper and lower, which can be connected by screws and threaded holes to form the second mounting plate 3102.

[0037] Multiple guide posts 312 are fixed on the first mounting plate 3101. The multiple large punches 314 and multiple small punches 315 are fixed on the second mounting plate 3102, which has multiple first guide holes 31021 for the multiple guide posts 312 to pass through.

[0038] The aforementioned liner plate 33 includes a liner plate body 332 and a guide plate 333 fixed to a horizontally mounted fixed plate 316 on the frame. The guide plate 333 is located on the inner side of the liner plate body 332, i.e., the lower side of the first flattening mechanism 31 and the upper side of the second flattening mechanism 32. The liner plate body 332 may also be provided with multiple, such as four, third guide holes 3321 for the guide posts 312 to slide up and down. Between the liner plate body 332 and the guide plate 333, there is a copper strip channel, such as a first rectangular copper strip channel 331, for accommodating the longitudinal and horizontal linear movement of the copper strip 2. Both the guide plate 333 and the fixed plate 316 have multiple, such as four, second guide holes for the multiple guide posts 312 to slide up and down, multiple, such as two large punches 314 to slide up and down, and multiple, such as eight small punches 315 to slide up and down. The fixed plate 316 described above can be referred to as the top plate in the first flattening mechanism 31 and as the bottom plate in the second flattening mechanism 32. It is easy to understand that the vertical positional relationship between the fixed plate 316, the liner body 332, and the guide plate 333 is as follows: In the first flattening mechanism 31, the fixed plate 316 is at the bottom and fixed to the frame of the first flattening mechanism 31; the guide plate 333 is in the middle and fixed to the fixed plate 316; and the liner body 332 is at the top and fixed to the guide plate 333. In the second flattening mechanism 32, the fixed plate 316 is at the top and fixed to the frame of the second flattening mechanism 32; the guide plate 333 is in the middle and fixed to the fixed plate 316; and the liner body 332 is at the bottom and fixed to the guide plate 333. The second guide hole on guide plate 333 can be called second guide hole A, and can be labeled 3331; the large punch guide hole on guide plate 333 can be called large punch guide hole A, and can be labeled 3332; the small punch guide hole on guide plate 333 can be called small punch guide hole A, and can be labeled 3333. The second guide hole on fixed plate 316 can be called second guide hole B, and can be labeled 3161; the large punch guide hole on fixed plate 316 can be called large punch guide hole B, and can be labeled 3162; the small punch guide hole on fixed plate 316 can be called small punch guide hole B, and can be labeled 3163.

[0039] The frame described in the above four paragraphs can be understood as follows: the frame of the first flattening mechanism 31 refers to the components such as the horizontal slide plate 36, the first vertical slide plate 37, the first mounting plate 3101, the second mounting plate 3102, and the liner plate 33 that are mounted on the first flattening mechanism 31; and the frame of the second flattening mechanism 32 refers to the components such as the horizontal slide plate 36, the first vertical slide plate 37, the first mounting plate 3101, the second mounting plate 3102, and the liner plate 33 that are mounted on the second flattening mechanism 32.

[0040] It is easy to understand that the first leveling mechanism 31 and the second leveling mechanism 32 have the same structure, only their directions are exactly opposite. For example, the first piston rod 341 of the first cylinder 34 of the first leveling mechanism 31 moves from bottom to top, while the first piston rod 341 of the first cylinder 34 of the second leveling mechanism 32 moves from top to bottom. Unlike the first leveling mechanism 31, a rectangular support frame 311 can be provided between the second leveling mechanism 32 and the first base plate 1. Alternatively, the frame of the second leveling mechanism 32 can have one more support frame 311 than the frame of the first leveling mechanism 31. It is easy to understand that the frames of both the first and second leveling mechanisms include two vertical plates 35, a horizontal plate 38, and a fixed plate 316. The support frame 311 can also be considered as part of the frame of the second leveling mechanism 32.

[0041] The front end of the frame, such as the first base plate 1, is as follows Figure 1 The right end shown has a copper belt drive wheel assembly 4. The copper belt drive wheel 42 in the copper belt drive wheel assembly 4 has multiple radial protrusions 4211 that are spaced apart along the circumference and engage with multiple punches 21 of the copper belt 2. The frame, such as the rear end of the first base plate 1, has a copper belt tensioning mechanism 5 that presses and tensions the copper belt 2 when the copper belt drive wheel 42 stops rotating.

[0042] like Figure 3 As shown, the copper strip tensioning mechanism 5 includes a slide table 52 that slides longitudinally and horizontally on a horizontal slide rail of a slide block in a frame such as the copper strip tensioning mechanism frame 51. Figure 3 As shown, the top of the inverted T-shaped copper strip tensioning mechanism frame 51 also serves as a slide block. The top surface of the slide block is a slide rail, and the bottom surface of the slide table 52 is a groove that mates with the slide rail, such as a dovetail rail mates with a dovetail groove (not shown in the figure). A pad 53 and a vertical second cylinder 54 are fixed on the slide table 52. Above the pad 53 is the free end of the piston rod of the second cylinder 54, which is used to press or release the copper strip 2 on the top surface of the pad 53. This piston rod can also be called the piston rod of the second cylinder 54. It can adopt the following specific structure: a vertical sliding block 541 can be fixed on the free end of the piston rod of the second cylinder 54. The sliding block 541 is slidably fitted in the vertical sliding hole 5421 of the cylinder seat 542 fixed on the slide table 52. The piston rod of the second cylinder 54 can be called the second piston rod, and the free end can be called the second free end.

[0043] like Figure 3 As shown, the cylinder body 551 of the third cylinder 55 used for tensioning the copper strip 2 in the horizontal direction is fixed to the slide of the frame, such as the copper strip tensioning mechanism frame 51, that is, fixed to the copper strip tensioning mechanism frame 51. The free end of the third piston rod 552 of the third cylinder 55, which can be called the third free end 5521, is fixed to the slide table 52. The slide table 52 slides both longitudinally and horizontally.

[0044] like Figure 8 and Figure 9 As shown, in the copper belt drive wheel assembly 4, the first motor 43 that drives the copper belt drive wheel 42 to rotate and the copper belt drive wheel 42 are both mounted on a second vertical slide plate 44. The second vertical slide plate 44 is slidably fitted on the vertical slide rail 411 of the frame, such as the copper belt drive wheel frame 41. The first base plate 1 of the frame has a fourth cylinder 46 that drives the second vertical slide plate 44 to rise so that the two rows of radial protrusions 4211 on the circumference of the two side plate wheels 421 of the copper belt drive wheel 42 engage into the two rows of regularly arranged punches 21, such as waist-shaped through holes 211, of the copper belt 2, or to fall so that the two rows of radial protrusions 4211 on the circumference of the two side plate wheels 421 of the copper belt drive wheel 42 disengage from the two rows of regularly arranged punches 21, such as waist-shaped through holes 211, of the copper belt 2. In other words, the first base plate 1 of the frame has a fourth cylinder 46 that drives the second vertical slide plate 44 to rise or fall. When the second vertical slide plate 44 rises, it drives the copper belt drive wheel 42 to rise, causing the two rows of radial protrusions 4211 on the circumference of the two side plate wheels 421 of the copper belt drive wheel 42 to engage with the two rows of regularly arranged punches 21, such as waist-shaped through holes 211, in the copper belt 2 to drive the copper belt 2 to move forward in a straight line in the longitudinal and horizontal direction. When the machine stops, it cooperates with the copper belt tensioning mechanism 5 to tighten the copper belt 2 so as to flatten the flipped part of the edge of the punch 21. When the second vertical slide plate 44 falls, it drives the copper belt drive wheel 42 to fall, causing the two rows of radial protrusions 421 on the circumference of the two side plate wheels 421 of the copper belt drive wheel 42 to disengage from the two rows of regularly arranged punches 21, such as waist-shaped through holes 211, in the copper belt 2, so that the beginning end of the copper belt 2 can pass through the copper belt channel from the copper belt inlet 4511 and exit from the copper belt outlet 5111, etc. The radial protrusion 421, such as the radial protrusion 421 with a square cross-section, has a tapered top 4211 at its tip to facilitate engagement with the waist-shaped through hole 211 of the copper strip 2. The tapered 4211 can also be called a tapered section or a tapered part. The horizontal strip seat 45 fixed on the frame, such as the frame of the first flattening mechanism 31, has a C-shaped copper strip channel 451 with an opening 4531 facing upward. The horizontal strip seat 45 below the copper strip 2 has two side plate wheels 421 extending along the length direction and into which the copper strip drive wheel 42 extends so that the radial protrusion 4211 engages with the waist-shaped through hole 211 and is parallel to each other. It is not difficult to understand that above the two elongated through holes 452 is a C-shaped copper strip channel 451. The top surface of the C-shaped copper strip channel 451 has two top plates 453. Both top plates 453 are located directly above their respective elongated through holes 452. Between the two top plates 453, there is an opening 4531 or notch that extends along the length direction.

[0045] It is easy to understand that after the copper strip 2 exits from the copper strip outlet 5111, it can be wound up using a winding device such as a conventional winding device, and then the copper strip roll can be removed for subsequent recycling. For example, the winding device can be installed at... Figure 1The position is at the left end. The terms "liner plate 33" and "pad plate 53" are interchangeable; "liner plate 33" can also be called an anvil. The large punch 314, small punch 315, liner plate 33, and pad plate 53 are all made of steel. That is, except for the motor and cylinders which are purchased externally, all other components of this device can be made of steel. The copper belt drive wheel 42 can also be considered a ratchet. The radial protrusion 421 can also be called a radial tooth. The above-mentioned fixing can be welding or screwing. This device may also include a main controller such as a PLC chip or computer, which is electrically connected to all cylinders and all motors and controls their operation. The motor may include a variable-speed gearbox or a self-regulating motor such as a servo motor or stepper motor.

[0046] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not marked in the drawings. The drawings are for illustrative purposes only. In case of any inconsistency between the drawings and the text description, or between the drawings themselves, the text description shall prevail.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A copper strip flattening device for stamping the lead frame of a chip, comprising a frame and a copper strip channel with a copper strip inlet and a copper strip outlet; characterized in that: The front end of the frame has a copper belt drive wheel assembly. The copper belt drive wheel in the assembly has multiple radial protrusions on its circumferential surface that are spaced along the circumference and engage with multiple punches in the copper belt. The rear end of the frame has a copper belt tensioning mechanism that presses and tightens the copper belt when the copper belt drive wheel stops rotating. The frame adjacent to the copper strip drive wheel assembly has a first flattening mechanism including a liner and multiple punches for flattening the rolled-up portion of the copper strip punched edge; The frame adjacent to the first leveling mechanism has a second leveling mechanism, which includes a liner and multiple punches and is used to level the rolled edge of the copper strip punch.

2. The copper strip flattening device after the lead frame of the stamped chip according to claim 1, characterized in that: The first and second leveling mechanisms both have the following structure: a first cylinder is fixed on the frame away from the liner; a horizontal sliding plate is fixed to the free end of the piston rod of the first cylinder and is slidably fitted on the frame; an inclined elongated through hole is on the horizontal sliding plate; a first vertical sliding plate is slidably fitted on the frame; a sliding column is fixed to one end of the first vertical sliding plate and is slidably fitted in the inclined elongated through hole to allow the first vertical sliding plate to slide up and down under the drive of the horizontal sliding plate; the other end of the first vertical sliding plate is fixed to a punch mounting plate; and multiple large punches and multiple small punches are fixed to the punch mounting plate with downward or upward flipping parts at the edge of the leveling punch.

3. The copper strip flattening device after the lead frame of the stamped chip according to claim 2, characterized in that: The punch mounting plate includes a first mounting plate fixed to the other end of the first vertical slide plate and horizontally oriented, and a second mounting plate located away from the first vertical slide plate and horizontally oriented; multiple guide posts are fixed on the first mounting plate; the multiple large punches and multiple small punches are fixed on the second mounting plate, and the second mounting plate has multiple first guide holes for the multiple guide posts to pass through; the liner plate includes a liner plate body fixed on the frame and a guide plate, the guide plate being located on the inner side of the liner plate body, and a copper strip channel for accommodating copper strip and allowing the copper strip to move longitudinally linearly between the liner plate body and the guide plate, the guide plate having multiple second guide holes for the guide posts to slide up and down, multiple large punch guide holes for the multiple large punches to slide up and down, and multiple small punch guide holes for the multiple small punches to slide up and down.

4. The copper strip flattening device after the lead frame of the stamped chip according to claim 3, characterized in that: Both the first mounting plate and the second mounting plate are vertically slidably fitted on the frame; there are multiple compression springs between the first mounting plate and the second mounting plate, each compression spring is fitted onto its respective compression spring mounting post fixed on the first mounting plate, and the two ends of the compression spring abut against the first mounting plate and the second mounting plate respectively, and the second mounting plate has compression spring mounting post holes for the compression spring mounting posts to slide up and down.

5. The copper strip flattening device after the lead frame of the stamped chip according to claim 4, characterized in that: The first leveling mechanism is used to level the downward-curved portion of the punched edge of the copper strip; the second leveling mechanism is used to level the upward-curved portion of the punched edge of the copper strip.

6. The copper strip flattening device after the lead frame of the stamped chip according to claim 1, characterized in that: The copper strip tensioning mechanism includes a slide table that slides longitudinally on the frame, a pad and a vertical second cylinder fixed on the slide table, and a free end of the piston rod of the second cylinder for pressing or loosening the copper strip on the top surface of the pad above the pad. The cylinder body of the horizontal third cylinder for tensioning the copper strip is fixed to the frame, and the free end of the piston rod is fixed to the slide table.

7. The copper strip flattening device after the lead frame of the stamped chip according to claim 1, characterized in that: The vertical cross-sectional shape of the horizontal copper strip channel is rectangular or C-shaped; the height of the copper strip channel is 3 to 4 times the thickness of the horizontal copper strip.

8. The copper strip flattening device after the lead frame of the stamped chip according to claim 1, characterized in that: The first motor driving the copper belt drive wheel and the copper belt drive wheel are both mounted on a second vertical slide plate. The second vertical slide plate is slidably fitted on the frame. The frame has a fourth cylinder that drives the second vertical slide plate to rise so that the two rows of radial protrusions on the circumference of the copper belt drive wheel engage into the two rows of regularly arranged waist-shaped through holes of the copper belt, or to fall so that the two rows of radial protrusions on the circumference of the copper belt drive wheel disengage from the two rows of regularly arranged waist-shaped through holes of the copper belt. The top of the radial protrusion is tapered to facilitate engagement into the waist-shaped through holes of the copper belt. The horizontal strip seat fixed on the frame has an upward-opening C-shaped copper belt channel. The horizontal strip seat below the copper belt has two long strip-shaped through holes that extend along the length direction and allow the two side plates of the copper belt drive wheel to extend into so that the radial protrusions engage with the waist-shaped holes and are parallel to each other.

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