Dual in-line packaging integrated circuit rib cutting machine

Abstract

The invention discloses a dual in-line packaging integrated circuit rib cutter, and belongs to the technical field of integrated circuit packaging. Comprising a supporting column, a base plate, a three-axis adjustable air cylinder, an air cylinder adapter, a cutter seat, a lower cutter gasket, a lower cutter, a positioning block, an upper cutter, a scraping piece, a scraping piece three-axis air cylinder, a probe seat, a correlation optical fiber probe, an optical fiber amplifier, a PLC, a cutter electromagnetic valve and a scraping piece electromagnetic valve. The integrated design of a lower installation part, a stroke-adjustable lower cutter, an elastic pressing cutter and an upper cutter is adopted, and the design that waste is automatically scraped, product rib cutting is automatically detected, and rib cutting is conducted on the two sides of a product step by step is adopted. The rib cutting machine has the advantages of high rib cutting quality, high rib cutting speed, wide product adaptability and simple and reliable structure. The problems that in an existing full-manual rib cutting technology, the rib cutting operation labor intensity is large, the rib cutting quality consistency is poor, the rib cutting efficiency is low, the side rib splashing direction cannot be controlled, and lower cutters collide with one another are solved. The cutting device is applied to the technical field of cutting of the pin edge ribs of the dual-in-line packaging shell of the electronic component.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated circuit packaging, and further relates to the technical field of lead side rib cutting of integrated circuit packaging housings. Specifically, it relates to a lead frame cutting machine for dual in-line package integrated circuits. Background Art

[0002] Lead frame cutting refers to the process of cutting off the excess leads (i.e., external pins) and frames (i.e., side ribs) of integrated circuits, as well as the overly long leads. For example, ceramic dual in-line package (CDIP) and ceramic glass hermetic dual in-line package (GDIP) are packaging forms of high-reliability integrated circuits. The semi-finished products with side ribs after this type of packaging (referred to as products) are ceramic cavity loose chips. Due to their relatively small production volume and special shape, the lead frame cutting equipment for this type of dual in-line package integrated circuits is generally non-standard equipment. Integrated circuit packaging factories design and manufacture this type of lead frame cutting equipment according to their own products, and most of the equipment is relatively simple. The equipment still uses a fully manual working mode. When cutting the lead frame, it is necessary to manually press or step on the switch to control the cutting. During the cutting process, the flying direction of the side ribs cannot be controlled, and the side ribs need to be manually removed. The lead frame cutting operation has a large labor intensity, poor consistency in cutting quality, and low cutting efficiency. Due to the use of the synchronous movement scheme of the lower cutting knives, when using small-sized lead frame cutting tools, it is easy to cause the lower cutting knives to collide and damage the lower cutting knives.

[0003] In the Chinese patent database, the application documents related to the lead frame cutting machine for ceramic glass hermetic dual in-line package integrated circuits include CN2022210070284 "A Dual In-line IC Pin Lead Frame Cutting Device", CN116137244A "An Integrated Circuit Cutting and Forming Equipment and Cutting Method", CN202210882209.X "A Lead Frame Cutting Equipment for Multiple Types of Integrated Circuits", etc. The technical solutions in the publicly disclosed cases do not disclose the technical solution of the present invention. Compared with the comparative documents, the present invention has higher cutting efficiency, better cutting quality, and more convenient maintainability.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to solve the problems in the existing fully manual lead frame cutting technology, such as large labor intensity in lead frame cutting operation, poor consistency in cutting quality, low cutting efficiency, inability to control the flying direction of side ribs, and collision of lower cutting knives.

[0006] To this end, the present invention provides a lead frame cutting machine for dual in-line package integrated circuits, as Figure 1-11As shown in the figure. It includes a support column 4, a substrate 5, a three-axis adjustable cylinder 6, a cylinder adapter 7, a cutter holder 8, a lower cutter shim 9, a lower cutter 10, a positioning block 11, an upper cutter 12, a scraping blade 13, a three-axis cylinder for scraping blade 14, a probe holder 15, a transmissive fiber optic probe 16, a fiber optic amplifier, a PLC controller, a cutter solenoid valve, and a scraping blade solenoid valve.

[0007] The substrate 5 is supported by 4 equal-height support columns 4. On both sides of the bottom surface of the substrate 5, a three-axis adjustable cylinder 6 is fixed respectively. The position of the three-axis adjustable cylinder 6 is adjusted by sliding in the cylinder mounting groove. A cylinder adapter 7 is fixed on each of the two three-axis adjustable cylinders 6; components are installed on the bottom surface of the substrate 5, leaving the upper surface of the substrate 5, so that except for the waste scraping device with a smaller size, there are no protruding components on the whole machine table, which is convenient for equipment operation. By using the three-axis adjustable cylinder 6, by adjusting the installation position and stroke of the three-axis adjustable cylinder 6, it can adapt to lower cutters 10 of different lengths, so that after the lower cutter 10 is worn and repaired, the change in the length of the lower cutter 10 can be compensated by adjusting the position and stroke of the three-axis adjustable cylinder 6. Such a design can enable the lower cutter 10 to be repaired and reused multiple times to save the equipment maintenance and use costs.

[0008] The lower cutter 10 is composed of a rear lower cutter and a front lower cutter. It is located between the two positioning blocks 11 in the horizontal direction, between the upper cutter 12 and the lower cutter shim 9 in the vertical direction, and moves back and forth in the horizontal direction. The connecting hole 1001 of the lower cutter 10 is sleeved on the pin of the cylinder adapter 7 to form a loose connection. This is to avoid forming a rigid whole between the lower cutter 10 and the cylinder adapter 7, to avoid the lower cutter from receiving lateral force and torsion from the cylinder adapter, and to avoid the collision between the cutting edges of the lower cutter and the upper cutter, which may cause damage to the upper cutter and the lower cutter.

[0009] The cutter holder 8 is fixed in the middle of the bottom surface of the substrate 5. The lower cutter shim 9 is placed between the lower cutter 10 and the cutter holder 8. The lower cutter shim 9 serves to prevent the lower cutter 10 from wearing the cutter holder 8. The positioning blocks 11 are placed on both sides of the lower cutter 10 to limit the horizontal left and right positions of the lower cutter 10. The upper cutter 12 presses on the lower cutter 10. Four screws respectively pass through the positioning holes of the upper cutter 12, the positioning block 11, the lower cutter shim 9, and the cutter holder 8 to fix the horizontal positions of the upper cutter, the positioning block, and the lower cutter shim, and are elastically tightened in the vertical direction through the elastic washers 1205 on the screws. Since the lower cutter 10 is slightly thicker than the positioning block 11, the positioning block 11 and the upper cutter 12 do not contact in the vertical direction. The upper cutter 12, the lower cutter 10, and the lower cutter shim 9 are closely attached together under the extrusion of the elastic washer to form a shearing mechanism. Using the elastic washer 1205 to press the upper cutter 12, the lower cutter 10, and the lower cutter shim 9 is beneficial to always keep these three in close contact, and not to be under too much pressure, which may cause the sliding resistance of the lower cutter 10 to be too large.

[0010] The scraping blade 13 is installed on the three-axis cylinder 14 for the scraping blade, and the three-axis cylinder 14 for the scraping blade is fixed on the upper surface of the substrate 5. The three-axis cylinder 14 for the scraping blade is connected to the scraping blade control solenoid valve (referred to as the scraping blade solenoid valve) through an air pipe. After the lower rib 3 of the product is cut off and when the product ceramic body 1 leaves the lead cutting position, the light of the opposed fiber optic is conducted, the fiber optic amplifier outputs a high level, and the scraping blade automatically scrapes the side rib 2 on the upper cutting knife lead cutting position under the control of the PLC.

[0011] There are two probe seats 15, which are respectively placed on the left and right sides of the upper surface of the substrate 5.

[0012] The transmitting end and the receiving end of the opposed fiber optic probe 16 are respectively installed on the corresponding probe seats 15. The transmitting end of the opposed fiber optic probe 16 is connected to the fiber optic output end of the fiber optic amplifier, and the receiving end of the opposed fiber optic probe 16 is connected to the fiber optic input end of the fiber optic amplifier.

[0013] The cutting knife solenoid valve includes two two-position five-way solenoid valves. The two two-position five-way solenoid valves are respectively connected to the two three-axis adjustable cylinders 6, and the power inputs of the two two-position five-way solenoid valves are respectively connected to the two output ends of the PLC controller.

[0014] For the PLC controller, programming is carried out in the PLC controller. The rear lower cutting knife and the front lower cutting knife perform step-by-step movement for lead cutting through the two cutting knife solenoid valves and the two three-axis adjustable cylinders, so as to control the splashing direction of the side ribs and avoid the collision of the front and rear lower cutting knives. In the usage scenario where it is not necessary to control the splashing direction of the side ribs and avoid the collision of the front and rear lower cutting knives, programming is carried out in the PLC controller to control the synchronous movement of the front and rear lower cutting knives for lead cutting; when there is no product on the upper cutting knife lead cutting position, the light of the opposed fiber optic is emitted from one end of the fiber optic probe to the other end through the notch of the scraping blade, and the fiber optic amplifier outputs a high level; when there is a product on the upper cutting knife, the product ceramic body 1 will block the opposed light, and the fiber optic amplifier outputs a low level. The fiber optic amplifier transmits the detection result to the PLC controller, and the PLC controller timely controls the on-off of the cutting knife solenoid valve and the scraping blade solenoid valve according to the presence or absence of the product, realizing automatic lead cutting and automatic removal of the side ribs.

[0015] Using the solution of the present invention for dual in-line package integrated circuits, the effects of high-quality and fast lead cutting are achieved, with wide product adaptability, flexible use, convenient maintenance, and simple and reliable structure.

[0016] It can be widely applied to the cutting technology field of the side ribs of the pins of the dual in-line package housing of electronic components. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a southwest isometric view of a dual in-line package structure.

[0018] Figure 2 It is a schematic diagram of a southwest isometric view of the top surface structure of the main body of the lead cutting machine mechanical system.

[0019] Figure 3 It is a schematic diagram of the bottom surface structure of the main body of the die bonder mechanical system.

[0020] Figure 4 It is a schematic diagram of the structure of the shearing mechanism of the die bonder.

[0021] Figure 5 It is a schematic diagram of the top view plane structure of the lower cutting tool.

[0022] Figure 6 It is a schematic diagram of the pre-scraping structure state of the automatic scraping system.

[0023] Figure 7 It is a schematic diagram of the post-scraping structure state of the automatic scraping system.

[0024] Figure 8 It is a schematic diagram of the structure of the product detection system.

[0025] Figure 9 It is a schematic diagram of the step-by-step movement state structure of the lower cutting tool.

[0026] Figure 10 It is a schematic diagram of the connection relationship of the components of the automatic control system.

[0027] Figure 11 It is a schematic diagram of the logic principle structure of the PLC automatic control program.

[0028] In the figure: 1 is the product ceramic body, 2 is the side rib of the product, 3 is the lower rib of the product, 4 is the pillar, 5 is the substrate, 6 is the three-axis adjustable cylinder, 7 is the cylinder adapter, 8 is the cutter holder, 9 is the lower cutter gasket, 10 is the lower cutting tool, 1001 is the connecting hole, 1002 is the edge of the lower cutting tool blade, 11 is the positioning block, 12 is the upper cutting tool, 1201 is the waste chute of the upper cutting tool, 1202 is the fixing hole of the upper cutting tool, 1203 is the extended pressing plate of the upper cutting tool, 1204 is the die bonding position of the upper cutting tool, 1205 is the elastic washer of the upper cutting tool, 13 is the scraping blade, 1301 is the notch of the scraping blade, 14 is the three-axis cylinder of the scraping blade, 15 is the probe holder, and 16 is the opposed fiber optic probe. Specific implementation method

[0029] As Figure 1-11 shown, the specific implementation method of the above-mentioned dual in-line package integrated circuit die bonder is as follows: The upper cutting knife 12 has a rectangular structure. Both its upper surface and lower surface are flat. The positioning holes 1202 are located at the four corners. This positioning hole design enables the positioning screws of the upper cutting knife to be far away from the lead cutting position 1204, and there are no protruding or sunken screws at the lead cutting position 1204, so that the scraping of the side ribs is not affected by the positioning screws and does not get stuck. The middle position of the upper cutting knife 12 is the lead cutting position 1204. The bottom surface of the lead cutting position 1204 is the lead cutting edge. There are extended pressing plates 1203 on both sides of the lead cutting position 1204 that press against the lower cutting knife. The bottom surface of the extended pressing plate 1203 is strictly in the same plane as the edge surface of the lead cutting position (ground flat as a whole during processing). The bottom surface of the extended pressing plate of the upper cutting knife presses against the lower cutting knife, which can ensure that the edge 1002 of the lower cutting knife is strictly in the same plane as the edge surface of the upper cutting knife, prevent gaps between the upper and lower cutting knives, and prevent the upper and lower cutting knives from cutting each other. Gaps between the upper and lower cutting knives will cause burrs to appear on the product leads after lead cutting, and mutual cutting of the upper and lower cutting knives will damage the upper and lower cutting knives. There is an inclined surface at both ends of the opening on both sides of the lead cutting position 1204 of the upper cutting knife to facilitate the smooth passage of the side ribs during automatic scraping.

[0030] The lower cutting knife 10 is composed of a rear lower cutting knife and a front lower cutting knife. It is located between the two positioning blocks 11 in the horizontal direction and between the upper cutting knife 12 and the lower cutting knife gasket 9 in the vertical direction, and can move back and forth in the horizontal direction. The connection hole 1001 of the lower cutting knife 10 is sleeved on the pin of the cylinder adapter 7. Since the diameter of the connection hole of the lower cutting knife 10 is 0.15 mm - 0.25 mm larger than the diameter of the pin of the cylinder adapter 7, the lower cutting knife and the cylinder adapter form a loose connection, so as to avoid forming a rigid whole between the lower cutting knife 10 and the cylinder adapter 7, avoid the lower cutting knife from receiving lateral force and torsion from the cylinder adapter, and avoid the collision between the cutting edges of the lower cutting knife and the upper cutting knife, which may damage the upper and lower cutting knives.

[0031] The edge 1002 of the lower cutting knife is a bevel edge, and the acute angle formed by the edge of the lower cutting knife and the adjacent edge of the edge is 86 degrees ± 2 degrees. This design avoids the cutting knife from simultaneously shearing all the leads and side ribs of the product during lead cutting, thereby reducing the power demand of the equipment, the requirements for the mechanical strength of the equipment, and the vibration during the operation of the equipment, and improving the stability of the equipment operation.

[0032] The PLC controller uses 1 input terminal X1 and 3 output terminals Y1, Y2, Y3. The input terminal X1 is connected to the output signal line of the fiber optic amplifier, and the output terminals Y1, Y2, Y3 are respectively connected to the control solenoid valve of the rear lower cutting knife, the control solenoid valve of the front lower cutting knife, and the control solenoid valve of the scraping blade. When the opposed fiber optic detects that there is a product at the lead cutting position, the PLC controller controls the two lower cutting knife solenoid valves to open step by step or synchronously. After the lower cutting knife cuts the leads step by step or synchronously, when the opposed fiber optic detects that the product has left the lead cutting position, the PLC controller controls the scraping blade solenoid valve to open, and the scraping blade moves to the left to scrape the side ribs at the lead cutting position.

[0033] The PLC controller controls the independent movement of the rear lower cutting knife, the front lower cutting knife, and the scraping blade respectively. The rear lower cutting knife and the front lower cutting knife perform step-by-step movement to cut the leads, or synchronous movement to cut the leads. The function of setting the step-by-step movement of the rear lower cutting knife and the front lower cutting knife is as follows: ① When cutting the leads of products with a relatively small appearance, since the lead pitch of its two columns is small, the width of the lead cutting position of the upper cutting knife is relatively small. Coupled with the fact that the lower cutting knife adopts a bevel design, in this case, in order to avoid the collision of the two lower cutting knives caused by the simultaneous extension of the rear lower cutting knife and the front lower cutting knife, it is necessary to set the step-by-step movement of the lower cutting knife to cut the leads. ② When cutting the leads, the side leads will splash. Different sequences of the movement of the lower cutting knives result in different splashing directions of the side leads of the product when cutting the leads. By setting the sequence of the lower cutting knives to cut the leads, the side leads are controlled to splash away from the operator, thus avoiding affecting the lead cutting operation.

[0034] Embodiment 1: Step-by-step movement of the lower cutting knife to cut the leads As Figure 1-9 shown, taking the GDIP14 package product as an example, for other package products, according to their outer dimensions, change the dimensions of the upper cutting knife 12 and the lead cutting position 1204 of the upper cutting knife, and adjust the initial position and stroke of the lower cutting knife through the three-axis adjustable cylinder to adapt to the upper cutting knife 12 for lead cutting.

[0035] As Figure 2 、 Figure 3 shown, install the support pillar 4 and the substrate 5, install two three-axis adjustable cylinders 6 on the bottom surface of the substrate and adjust the front and rear positions of the three-axis adjustable cylinders, fix the two cylinder adapters 7 on the movable panel of the three-axis adjustable cylinder, and fix the cutter holder 8 on the bottom surface of the substrate with screws.

[0036] As Figure 2 、 Figure 4 Place two lower cutting knife gaskets 9 on the cutter holder 8 from above the substrate, place the two lower cutting knives 10 on the front and rear sides of the cutter holder respectively, and make the lower cutting knife connection holes 1001 sleeved on the connecting columns of the cylinder adapter. Place two positioning blocks 11 on the left and right sides of the lower cutting knife respectively, place the upper cutting knife 12 on the lower cutting knife, so that the upper cutting knife expansion pressure plate 1203 presses the two lower cutting knives, and align the cutter holder, the lower cutting knife gasket, the positioning block, and the upper cutting knife fixing hole 1202. Tighten and fix with the upper cutting knife elastic washer 1205 and the fixing screw, and adjust the tightness of the fixing screw until the lower cutting knife can slide back and forth and the upper and lower cutting knives are closely fitted. Adjust the stroke of the three-axis adjustable cylinder so that the cutting edge 1002 of the two lower cutting knives can exceed the cutting edge of the upper cutting knife when they extend.

[0037] As Figure 6 , fix the scraping blade 13 on the movable panel of the scraping blade three-axis cylinder 14 with screws.

[0038] As Figure 7, Adjust the position of the three-axis blade cylinder so that the position of the blade reaches exactly the left edge of the upper cutter after the cylinder extends, and ensure that the end of the blade can slide left and right against the surface of the scribing position of the upper cutter. Then fix the three-axis blade cylinder with screws from the bottom of the substrate.

[0039] As Figure 8 , Fix the two probe seats 15 on the substrate, install the two probes of the opposed fiber optic probe 16 on the probe seats, and at the same time adjust the position so that the light of the opposed fiber optic can pass through the blade notch 1301.

[0040] As Figure 10 , Connect the input end of the opposed fiber optic to the light output end of the fiber optic amplifier, and connect the output end of the opposed fiber optic to the light input end of the fiber optic amplifier. Connect the signal output line of the fiber optic amplifier to the input port X1 of the PLC controller. The output ends Y1, Y2, and Y3 of the PLC controller are respectively connected to the rear lower cutter solenoid valve, the front lower cutter solenoid valve, and the blade solenoid valve. Connect the rear lower cutter solenoid valve to the rear three-axis adjustable cylinder with an air pipe, the front lower cutter solenoid valve to the front three-axis adjustable cylinder, and the blade solenoid valve to the blade cylinder. Check whether the connection from the output of the PLC controller to the cylinder is correct.

[0041] As Figure 11 , Program according to the PLC automatic control schematic diagram and set it for the step-by-step movement of the lower cutter. The reason for setting the step-by-step movement of the lower cutter is as follows: For products with smaller sizes, the spacing between the two rows of leads is small, so the distance between the two side edges of the upper cutter is relatively close. As Figure 5 , Coupled with the bevel design at the edge of the lower cutter blade, if the two lower cutters extend simultaneously, it will cause the two lower cutters to collide; in addition, as Figure 6 , When the product is scribed, the lower side rib 3 of the product directly falls into the waste box of the scribing machine, but the side rib 2 of the product either stays on the upper cutter or splashes in any direction. Using the step-by-step movement of the lower cutter can control the splashing direction of the side rib of the product, so that the side rib 2 of the product will not splash towards the operator. The side rib waste that does not splash is automatically scraped by the blade 13 into the waste collection box.

[0042] As Figure 9, when performing product dicing, place the product at the dicing position 1204 of the upper dicing knife. At this time, the ceramic body (1) of the product blocks the opposed light, providing an input signal X1 to the PLC to turn on. The program is set such that the output terminal Y1 of the PLC is turned on. Then, the solenoid valve of the rear lower dicing knife is opened, and the rear lower dicing knife moves towards the product for dicing. Subsequently, Y1 is turned off, the solenoid valve of the rear lower dicing knife is reset, and the rear lower dicing knife is reset. After a delay (0.1 s), the output terminal Y2 of the PLC is turned on, the solenoid valve of the front lower dicing knife is opened, and the front lower dicing knife moves towards the product for dicing. Subsequently, Y2 is turned off, the solenoid valve of the front lower dicing knife is reset, and the front lower dicing knife is reset. When the product is removed from the dicing position, the opposed light is turned on, and the input signal X1 is turned off. The program is set such that the output terminal Y3 of the PLC is turned on, the solenoid valve of the wiper is opened, and the wiper moves to the left. Since there are four waste chute 1201 on the left and right sides of the upper dicing knife, the wiper can smoothly scrape the side ribs at the dicing position into the waste collection box. After a delay (0.1 s), the output terminal Y3 is turned off, the solenoid valve of the wiper is reset, and the wiper moves to the right to reset, completing a dicing process.

[0043] Through long-term use and verification, the present invention is reasonably designed, operates reliably, has good dicing quality, high dicing speed, and very low failure rate. It is a low-cost and high-benefit solution for dicing dual in-line package integrated circuits and is worthy of popularization and application in relevant integrated circuit packaging factories.

[0044] Embodiment 2: Dicing with synchronous movement of the lower dicing knife

[0045] In the usage scenario where there is no collision between the lower dicing knives and no need to control the flying direction of the side ribs, in the PLC controller, program to control the two lower dicing knives to move synchronously during dicing, and the rest of the implementation process is the same as that of Embodiment 1.

[0046] Finally, it should be noted that the above embodiments are merely examples given for clear illustration. The present invention includes but is not limited to the above embodiments, and it is not necessary and impossible to list all the implementation manners here. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. All implementation manners that meet the requirements of the present invention fall within the protection scope of the present invention.

Claims

1. A dual in-line package integrated circuit lead cutting machine, characterized in that: It includes a support column (4), a substrate (5), a three-axis adjustable cylinder (6), a cylinder adapter (7), a cutter seat (8), a lower cutter gasket (9), a lower cutter (10), a positioning block (11), an upper cutter (12), a scraping blade (13), a three-axis cylinder for the scraping blade (14), a probe seat (15), an opposed fiber optic probe (16), a fiber optic amplifier, a PLC controller, a cutter solenoid valve and a scraping blade solenoid valve; The substrate (5) is supported by 4 equal-height support columns (4). On both sides of the bottom surface of the substrate (5), a three-axis adjustable cylinder (6) is respectively fixed. The position of the three-axis adjustable cylinder (6) is adjusted by sliding in the cylinder mounting groove. A cylinder adapter (7) is fixed on each of the two three-axis adjustable cylinders (6); Components are installed on the bottom surface of the substrate (5), leaving the upper surface of the substrate (5); By adjusting the installation position and stroke of the three-axis adjustable cylinder (6), it is adapted to the change in the length of the lower cutter (10); The lower cutter (10) is composed of a rear lower cutter and a front lower cutter. It is located between two positioning blocks (11) in the horizontal direction, between the upper cutter (12) and the lower cutter gasket (9) in the vertical direction, and moves back and forth in the horizontal direction; The connection hole (1001) of the lower cutter (10) is sleeved on the pin of the cylinder adapter (7) to form a loose connection; The cutter seat (8) is fixed in the middle of the bottom surface of the substrate (5), and the lower cutter gasket (9) is placed between the lower cutter (10) and the cutter seat (8); The positioning blocks (11) are placed on both sides of the lower cutter (10) to limit the horizontal left and right positions of the lower cutter (10). The upper cutter (12) presses on the lower cutter (10); 4 screws respectively pass through the positioning holes of the upper cutter (12), the positioning block (11), the lower cutter gasket (9), and the cutter seat (8) to fix the horizontal positions of the upper cutter, the positioning block, and the lower cutter gasket; And through the elastic gasket (1205) on the screw, it is elastically pressed in the vertical direction. The lower cutter (10) is slightly thicker than the positioning block (11). The upper cutter (12), the lower cutter (10), and the lower cutter gasket (9) are closely attached together under the extrusion of the elastic gasket to form a shearing mechanism; The scraping blade (13) is installed on the three-axis cylinder for the scraping blade (14), and the three-axis cylinder for the scraping blade (14) is fixed on the upper surface of the substrate (5); The three-axis cylinder for the scraping blade (14) is connected to the scraping blade control solenoid valve through an air pipe; After the lower side rib (3) of the product is cut off and when the product ceramic body (1) leaves the lead cutting position, the opposed fiber optic light is conducted, the fiber optic amplifier outputs a high level, and the scraping blade automatically scrapes the side rib (2) on the lead cutting position of the upper cutter under the control of the PLC; There are two probe seats (15), which are respectively placed on the left and right sides of the upper surface of the substrate (5); The emitting end and the receiving end of the opposed fiber optic probe (16) are respectively installed on the corresponding probe seats (15). The emitting end of the opposed fiber optic probe (16) is connected to the fiber optic output end of the fiber optic amplifier, and the receiving end of the opposed fiber optic probe (16) is connected to the fiber optic input end of the fiber optic amplifier; The cutting solenoid valve includes two two-position five-way solenoid valves, which are respectively connected to two three-axis adjustable cylinders (6), and the power inputs of the two two-position five-way solenoid valves are respectively connected to two output terminals of the PLC controller; The PLC controller is programmed to perform automatic lead cutting and automatic cleaning of side leads (2).

2. A lead cutting machine for dual in-line package integrated circuits according to claim 1, characterized in that: The upper cutting knife (12) has a rectangular structure, and both the upper surface and the lower surface are flat. The positioning holes (1202) are located at the four corners. The positioning holes (1202) keep the positioning screws of the upper cutting knife away from the lead cutting position (1204), and there are no screw protrusions or depressions at the lead cutting position (1204), so that the scraping of the side leads (2) is not affected by the positioning screws and does not get stuck; the middle position of the upper cutting knife (12) is the lead cutting position (1204), the bottom surface of the lead cutting position (1204) is the lead cutting edge, and there are extended pressing plates (1203) for pressing against the lower cutting knife on both sides of the lead cutting position (1204). The bottom surface of the extended pressing plate (1203) is in the same plane as the edge surface of the lead cutting position. Part of the bottom surface of the extended pressing plate of the upper cutting knife presses against the lower cutting knife; the two ends of the openings on both sides of the lead cutting position (1204) of the upper cutting knife are beveled, which are waste material chutes (1201).

3. A lead cutting machine for dual in-line package integrated circuits according to claim 1, characterized in that: The diameter of the connecting hole (1001) of the lower cutting knife (10) is 0.15 mm - 0.25 mm larger than the diameter of the pin of the cylinder adapter (7); the edge of the cutting edge of the lower cutting knife (10) is a bevel, and the acute angle formed by the cutting edge (1002) of the lower cutting knife and the adjacent edge of the cutting edge is 86 degrees ± 2 degrees.

4. A lead cutting machine for dual in-line package integrated circuits according to claim 1, characterized in that: The PLC controller uses 1 input terminal X1 and 3 output terminals Y1, Y2, Y3. The input terminal X1 is connected to the output signal line of the fiber optic amplifier, and the output terminals Y1, Y2, Y3 are respectively connected to the control solenoid valve of the rear lower cutting knife, the control solenoid valve of the front lower cutting knife, and the control solenoid valve of the wiper; when the opposed fiber optic detects that there is a product at the lead cutting position, the PLC controller controls the two lower cutting knife solenoid valves to open step by step or synchronously. After the lower cutting knives cut the leads step by step or synchronously, when the opposed fiber optic detects that the product has left the lead cutting position, the PLC controller controls the wiper solenoid valve to open, and the wiper moves to the left to scrape the side leads (2) at the lead cutting position.

5. A lead cutting machine for dual in-line package integrated circuits according to claim 1, characterized in that: The PLC controller controls the rear lower cutting knife and the front lower cutting knife to move independently through two cutting solenoid valves and two three-axis adjustable cylinders (6); in the application scenarios of avoiding the collision of the lower cutting knives and controlling the splashing of the side leads, the PLC controller controls the rear lower cutting knife and the front lower cutting knife to cut the leads step by step; in the application scenarios without special requirements, the PLC controller controls the rear lower cutting knife and the front lower cutting knife to cut the leads synchronously.

6. A lead cutting machine for dual in-line package integrated circuits according to claim 1, characterized in that: The lead cutting process of the lead cutting machine is as follows: When cutting the leads of the product, place the product at the lead cutting position (1204) of the upper cutting knife. At this time, the ceramic body (1) of the product blocks the opposed light rays, providing an input signal X1 to the PLC to turn on. The program is set to turn on the output terminal Y1 of the PLC. Then, the solenoid valve of the rear lower cutting knife is opened, and the rear lower cutting knife moves towards the product to cut the leads. Subsequently, Y1 is turned off, the solenoid valve of the rear lower cutting knife is reset, and the rear lower cutting knife is reset. After a delay of 0.1 s, the output terminal Y2 of the PLC is turned on, the solenoid valve of the front lower cutting knife is opened, and the front lower cutting knife moves towards the product to cut the leads. Subsequently, Y2 is turned off, the solenoid valve of the front lower cutting knife is reset, and the front lower cutting knife is reset; When the ceramic body (1) of the product is removed from the lead cutting position, the opposed light rays are turned on, and the input signal X1 is turned off. The program is set to turn on the output terminal Y3 of the PLC at this time. The solenoid valve of the wiper is opened, and the wiper moves to the left. The wiper scrapes the side leads on the lead cutting position and drops them into the waste collection box. After a delay of 0.1 s, the output terminal Y3 is turned off, the solenoid valve of the wiper is reset, and the wiper moves to the right to reset, completing one lead cutting process.

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