Power module production process and production device

Abstract

The invention belongs to the technical field of electronic module production, and particularly relates to a power module production process and a power module production device, through four rotatable lower mold plates, an injection molding material can be injected into a cavity formed by a lower plastic package mold and a plastic package cavity through an injection molding opening to form a required power module shape; the laser marking machine on the rear side can provide accurate marks, the traceability of products is improved, the lower plastic packaging mold capable of ascending and descending is matched with the rib cutting tool bit to accurately cut off redundant ribs of the lead frame, finally, the rotating lower mold plate conveys a power module machined by the equipment to the front side, and due to the automatic arrangement, the production efficiency is improved, and the production cost is reduced. According to the power module machining device, the same device can achieve multi-process operation, multiple machining schedules can be conducted synchronously, the requirement for manual operation is reduced, the production speed is increased, meanwhile, direct contact between staff and an isolation module and between the staff and multiple devices is reduced, industrial injury risks and human errors are reduced, the consistency of power module machining is guaranteed, and the production efficiency is improved. And the processing quality of the power module product is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic module production, and in particular relates to a power module production process and a production device. Background Art

[0002] In the manufacturing process of power modules (such as TPAK modules), plastic sealing, marking, rib cutting and material collection are the core process links. However, in the traditional production process, the plastic-sealed modules need to be transferred to the marking equipment to complete the marking, and then transferred to the rib cutting equipment to separate the single modules, and finally the materials are collected manually or by a robotic arm. Multiple transfers are prone to poor compatibility between devices, resulting in increased downtime, increased time and labor costs, and the risk of contamination or damage. Different equipment needs to independently debug parameters (such as plastic sealing temperature, marking depth, rib cutting pressure), and there are many manual monitoring links, and consistency is difficult to guarantee, which may also cause unstable quality of power module products. Summary of the invention

[0003] The purpose of the present invention is to provide a power module production process and a production device to solve the problems mentioned in the background technology.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0005] A power module production device, comprising a base, a laser marking machine is installed on the upper side of the rear part of the base, a vertical tube is rotatably installed on the upper side of the base, a large gear is concentrically fixed on the lower side of the vertical tube, and a small gear meshing with the large gear is rotatably installed on the side of the vertical tube, a stepping motor connected to the small gear is installed on the lower side of the base, four lower templates uniformly distributed in a circumference are fixed on the upper side of the vertical tube, each of the lower templates includes a plurality of lower plastic sealing molds connected to the upper and lower sliding parts, a fixing frame is commonly fixed on the lower side of each group of lower plastic sealing molds, a control mechanism for controlling the height of the fixing frame is installed on the upper side of the base, a first cylinder fixed to the base is installed on the upper side of the lower template on the left side, an upper template matching the lower template is fixed on the lower side of the output end of the first cylinder, a plurality of plastic sealing cavities matching the lower plastic sealing molds are arranged on the upper side of the upper template, and injection ports are arranged on the top of the plastic sealing cavities, a second cylinder is fixed on the upper side of the right part of the base, and a rib cutting knife head matching the lower plastic sealing mold is fixed on the lower side of the output end of the second cylinder;

[0006] The control mechanism includes multiple vertical rods fixed to the bottom of the lower template, the fixing frame is connected to the vertical rods in an up and down sliding manner, a limiting plate is fixed to the lower side of the vertical rod, a roller is rotatably installed on the lower side of each of the fixing frames, a C-shaped table matching the roller is horizontally fixed on the upper side of the base, the notch of the C-shaped table faces right, and the front and rear ends of the C-shaped table are provided with upward inclined surfaces.

[0007] Upper sliding grooves are formed in the middle of multiple plastic encapsulation cavities. Upper top blocks matching the upper sliding grooves are installed in the upper sliding grooves in a vertically sliding manner. A sliding rod is fixed to the upper side of each upper top block. A sleeve that is slidably connected to the sliding rod and fixed to the upper side of the upper template is sleeved on the outer side of the sliding rod. A first spring is also sleeved on the outer side of the sliding rod. The upper and lower ends of the first spring are respectively fixedly connected to the bottom of the sleeve and the middle of the sliding rod. A horizontally oriented cross plate is fixedly connected to the tops of the sliding rods. Support blocks matching the cross plate are fixed to the left and right sides of each lower template.

[0008] A sliding frame matching the lower template and the trimming knife head is provided on the outer side of the trimming knife head. Sliding bolts are vertically fixed to the left and right sides of the sliding frame. Slideways are fixed to the left and right sides of the trimming knife head. The sliding bolts are slidably connected to the slideways in the vertical direction. A limiting plate is fixed to the top of the sliding bolt. A second spring that is fixedly connected to the sliding frame and the slideway respectively is sleeved on the outer side of the sliding bolt.

[0009] A waste material groove is connected to the lower right side of the base. A support rod fixed to the base is installed on the front side of the waste material groove. A pushing plate matching the lower template is connected to the upper side of the support rod. The pushing plate and the support block do not interfere with each other.

[0010] Lower sliding grooves are formed in the middle of each lower plastic encapsulation mold. Lower top blocks matching the lower sliding grooves are slidably installed in the lower sliding grooves. A top rod is fixed to the lower side of each lower top block. A sliding sleeve fixed to the bottom of the lower plastic encapsulation mold is sleeved on the outer side of the top rod. A lower top plate is fixedly connected to the lower sides of multiple top rods. A return spring that is fixedly connected to the lower top plate and the sliding sleeve respectively is sleeved on the outer side of the top rod. A top wheel is rotatably installed on the lower side of the lower top plate. An arc-shaped block matching the top wheel is fixed to the upper side of the front part of the C-shaped platform. Inclined surfaces are also provided at the left and right ends of the arc-shaped block.

[0011] Positioning frames matching the lower template are installed at the four corners of the lower template. The positioning frames are fixedly connected to the fixing frame.

[0012] Both the upper template and the lower plastic encapsulation mold are of a hollow structure. Water inlet pipes and water outlet pipes communicating with the interior are installed on both the lower plastic encapsulation mold and the upper template. A rotary joint is vertically installed in the middle of the vertical pipe. A cooling tank is installed on the lower side of the base. A return water pipe matching the cooling tank is fixed to the side of the rotary joint. Multiple water outlet pipes are connected to the upper end of the return water pipe through pipelines. Multiple water inlet pipes are connected to the output end of the rotary joint through pipelines. A water pump is installed inside the cooling tank. The input end of the rotary joint is connected to the output end of the water pump through a pipeline.

[0013] A production process of a power module is as follows:

[0014] Step 1: Place the semi-finished power module composed of the bonded module chip and the lead frame on the upper side of the lower template on the left. Subsequently, the upper template is fitted with the lower template, and the injection molding material is injected through the injection port into the inner side of the chamber formed by the lower encapsulation mold and the encapsulation cavity to form the required shape of the power module.

[0015] Step 2: Wait for a certain period of time to cool. The stepping motor rotates, causing the encapsulated power module to rotate to the rear side. The laser marking machine can provide precise markings, increasing the traceability of the product.

[0016] Step 3: The stepping motor rotates again, rotating the marked power module to the right side. The roller on the lower side of the lower encapsulation mold leaves the C-shaped table, allowing the lower encapsulation mold to move downward. The clearance fit between the lower encapsulation mold and the lower template and the trimming cutter head can accurately cut off the ribs of the redundant lead frame to complete the trimming operation.

[0017] Step 4: The stepping motor continues to rotate, and the push plate pushes the waste frame generated by the trimming operation away from the lower template and separates it from the power module.

[0018] Step 5: The stepping motor continues to rotate, rotating the processed power module to the front side. The roller and the C-shaped table lift the power module upward through the inclined plane, and the top wheel and the arc block cooperate to make the lower top block push the processed power module upward and separate it from the lower encapsulation mold, facilitating the picking of the processed power module of the device.

[0019] The present invention has at least the following advantages compared with the prior art:

[0020] Through the transmission of the large gear, small gear and stepping motor, the rotation of the vertical pipe can be accurately controlled, thereby realizing the rotation and positioning of the lower template. The injection molding material is injected through the injection port between the lower encapsulation mold and the chamber formed by the encapsulation cavity to form the required shape of the power module. The laser marking machine on the rear side can provide precise markings, increasing the traceability of the product. The vertically movable lower encapsulation mold cooperates with the trimming cutter head to accurately cut off the ribs of the redundant lead frame. Finally, the rotating lower template conveys the processed power module of the equipment to the front side. This automated setting enables the same device to perform multi-process operations, and multiple processing progress can be synchronized, reducing the need for manual operation, accelerating the production speed. At the same time, it also reduces the direct contact between employees and isolation modules and various devices, reducing the risk of work-related injuries and human errors, ensuring the consistency of power module processing and guaranteeing the processing quality of power module products;

[0021] The cooperation of the cross plate, the sliding rod and the support block enables the lower end of the upper ejector block to be flush with the upper side inside the plastic encapsulation cavity when the upper template fits with the lower template. Only at this time can the power module be normally plastic encapsulated. When the upper template moves upward and separates from the lower template, the first spring causes the upper ejector block to eject downward, thereby preventing the plastic encapsulated power module from adhering to the upper template and improving the reliability of the production device; the cooperation of the second spring, the sliding bolt and the sliding frame enables the cutting knife head to clamp the finished power module after marking when moving downward, preventing displacement during punching and cutting the leads, achieving precise cutting, reducing product defects and scrap rate, and at the same time preventing the waste frame cut out from the power module from adhering to the cutting knife head after the lead cutting is completed, further improving the operation stability and reliability of the device; the push plate that matches the lower template and does not interfere with the support block can push the waste frame generated by the upper side lead cutting operation on the right lower template into the lower waste chute for discharge when the vertical pipe rotates, realizing automatic waste separation, and at the same time making the device structure simple and reliable, helping to reduce the maintenance cost of the device; when the power module after lead cutting rotates to the front side, the roller rotates to the upper side of the front part of the C-shaped plate to lift the lower plastic encapsulation mold upward, and the top wheel rolls from the inclined surface of the arc-shaped block to the upper side of the arc-shaped block, thereby lifting the power module from the lower plastic encapsulation mold, preventing the power module from adhering to the lower plastic encapsulation mold and at the same time facilitating the picking of the processed power module of the device, improving the convenience of use of the device; the positioning frame fixedly connected to the fixed frame can rise and fall with the lower plastic encapsulation template, accurately positioning the semi-finished power module on the upper side of the upper template while not affecting the push plate to push out the waste after lead cutting, further ensuring the processing accuracy of the device and further improving the product quality; the cooperation of the rotary joint and the vertical pipe enables the water flow generated by the water pump to circulate inside the upper template and the lower plastic encapsulation mold through the water inlet pipe and the water outlet pipe respectively, and finally flows into the inner side of the cooling tank through the return water pipe, quickly cooling the power module to be plastic encapsulated during the plastic encapsulation operation without affecting the overall rotation operation of the lower template, thereby shortening the cooling time of the power module plastic encapsulation and accelerating the production speed of the power module. Brief Description of the Drawings

[0022] The present invention can be further illustrated by the non-limiting embodiments given in the drawings.

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a cross-sectional structural schematic diagram of the side of the present invention.

[0025] Figure 3 is Figure 2 an enlarged structural schematic diagram of part A in

[0026] Figure 4 It is a cross-sectional structural schematic diagram of the upper template of the present invention.

[0027] Figure 5 For Figure 4 the enlarged structural schematic diagram at position B in

[0028] Figure 6 the bottom structural schematic diagram of the upper template in the present invention.

[0029] Figure 7 the bottom structural schematic diagram of the lead cutting tool head in the present invention.

[0030] Figure 8 the partial structural schematic diagram of the present invention.

[0031] Figure 9 the structural schematic diagram of the lower template area in the present invention.

[0032] Figure 10 the sectional structural schematic diagram of the lower plastic encapsulation mold and the fixing frame area in the present invention.

[0033] Figure 11 For Figure 10 the enlarged structural schematic diagram at position C in

[0034] Base 1, laser marking machine 2, vertical pipe 3, large gear 4, small gear 5, stepping motor 6, lower template 7, lower plastic encapsulation mold 8, fixing frame 9, first cylinder 10, upper template 11, plastic encapsulation cavity 12, injection port 13, second cylinder 14, lead cutting tool head 15, vertical rod 16, limit piece 17, roller 18, C-shaped table 19, inclined surface 20, upper sliding groove 21, upper top block 22, sliding rod 23, sleeve 24, first spring 25, cross plate 26, support block 27, sliding frame 28, sliding bolt 29, slideway 30, limit plate 31, second spring 32, waste slot 33, support rod 34, pushing plate 35, lower sliding groove 36, lower top block 37, ejector rod 38, sliding sleeve 39, lower top plate 40, return spring 41, top wheel 42, arc-shaped block 43, positioning frame 44, water inlet pipe 45, water outlet pipe 46, rotary joint 47, cooling groove 48, return water pipe 49, water pump 50. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] As Figures 1-11As shown in the figure, a power module production device includes a base 1. On the upper side of the rear part of the base 1, a laser marking machine 2 is installed. On the upper side of the base 1, a vertical pipe 3 is rotatably installed. Concentrically fixed to the lower side of the vertical pipe 3 is a large gear 4, and a small gear 5 meshing with it is rotatably arranged on its side. Installed on the lower side of the base 1 is a stepping motor 6 drivingly connected to the small gear 5. Fixed to the upper side of the vertical pipe 3 are four lower templates 7 evenly distributed in a circumferential manner. Each lower template 7 includes a plurality of lower plastic encapsulation molds 8 slidably connected to it up and down. A fixing frame 9 is commonly fixed to the lower sides of each group of lower plastic encapsulation molds 8. Installed on the upper side of the base 1 is a control mechanism for controlling the height of the fixing frame 9. On the upper side of the left lower template 7, a first cylinder 10 fixed to the base 1 is installed. Fixed to the lower side of the output end of the first cylinder 10 is an upper template 11 matching the lower template 7. On the upper side of the upper template 11 are provided a plurality of plastic encapsulation cavities 12 matching the lower plastic encapsulation molds 8. Injection ports 13 are provided at the tops of the plastic encapsulation cavities 12. Fixed to the upper side of the right part of the base 1 is a second cylinder 14. Fixed to the lower side of the output end of the second cylinder 14 is a lead frame cutting tool head 15 matching the lower plastic encapsulation molds 8;

[0037] The control mechanism includes a plurality of vertical rods 16 fixed to the bottom of the lower template 7. The fixing frame 9 is slidably connected to the vertical rods 16. A limiting piece 17 is fixed to the lower side of the vertical rods 16. A roller 18 is rotatably installed on the lower side of each fixing frame 9. Horizontally fixed to the upper side of the base 1 is a C-shaped platform 19 matching the roller 18. The notch of the C-shaped platform 19 faces right. Slopes 20 facing upward are provided at both the front and rear ends of the C-shaped platform 19.

[0038] The semi-finished module composed of the bonded module chip and the lead frame is placed on the upper side of the left lower template 7. The injection port 13 is connected to an external injection device. When it is necessary to plastic-encapsulate the module semi-finished product, the first cylinder 10 extends, and the upper template 11 is attached to the lower template 7. At this time, the lower plastic encapsulation mold 8 and the plastic encapsulation cavity 12 jointly form a complete plastic encapsulation cavity. Plastic encapsulation material is filled into the inner side of the injection hole through the injection port 13. After the plastic encapsulation material cools, the first cylinder 10 shortens, and under the action of gravity, the power module semi-finished product is separated from the upper template 11. At this time, the power module is plastic-encapsulated. Immediately afterwards, the stepping motor 6 drives the vertical pipe 3 to rotate through the cooperation of the small gear 5 and the large gear 4, and the plastic-encapsulated power module semi-finished product is rotated to the lower side of the laser marking machine 2. The laser marking machine 2 is an existing publicly known technology and can mark the produced power module. After marking, the stepping motor 6 continues to rotate, and the marked power module is continuously rotated to the right. At this time, the roller 18 on the lower side of the fixing frame 9 rotates to the notch of the C-shaped plate, and the roller 18 loses the support of the C-shaped plate. Together with the fixing frame 9 and the lower plastic encapsulation mold 8, it can descend within the range above the limiting piece 17. The second cylinder 14 extends to press the lead frame cutting tool head 15 downward, and in cooperation with the gap between the lower plastic encapsulation mold 8 and the lower template 7, the redundant lead frame ribs are accurately cut off. Finally, the stepping motor 6 rotates the power module after lead frame cutting to the front side for convenient material taking.

[0039] Through the transmission of the large gear 4, the small gear 5 and the stepping motor 6, the rotation of the vertical pipe 3 can be accurately controlled, and then the rotation and positioning of the lower template 7 can be realized. The injection material is injected through the injection port 13 between the chamber formed by the lower plastic encapsulation mold 8 and the plastic encapsulation cavity 12 to form the required shape of the power module. The laser marking machine 2 at the rear side can provide accurate markings, increasing the traceability of the product. The vertically movable lower plastic encapsulation mold 8 and the lead frame cutting tool head 15 can accurately cut off the redundant ribs of the lead frame. Finally, the rotating lower template 7 conveys the power module processed by the equipment to the front side. This automated setting enables the same device to perform multi-process operations, and multiple processing progress can be synchronized, reducing the need for manual operations, accelerating the production speed. At the same time, it also reduces the direct contact between employees and the isolation module and various equipment, reducing the risk of work-related injuries and human errors, ensuring the consistency of power module processing and the processing quality of power module products.

[0040] Upper sliding grooves 21 are opened in the middle of multiple plastic encapsulation cavities 12. Upper top blocks 22 that match them are installed in the upper and lower sliding manner on the inner sides of the upper sliding grooves 21. A sliding rod 23 is fixed on the upper side of each upper top block 22. A sleeve 24 that is slidably connected to the sliding rod 23 and fixed to the upper side of the upper template 11 is sleeved on the outer side of the sliding rod 23. A first spring 25 is also sleeved on the outer side of the sliding rod 23. The upper and lower ends of the first spring 25 are respectively fixedly connected to the bottom of the sleeve 24 and the middle of the sliding rod 23. A horizontally oriented cross plate 26 is fixedly connected to the tops of the sliding rods 23. Support blocks 27 that match the cross plate 26 are fixed on the left and right sides of each lower template 7.

[0041] The cooperation of the cross plate 26, the sliding rod 23 and the support block 27 enables the lower end of the upper top block 22 to be flush with the upper side inside the plastic encapsulation cavity 12 when the upper template 11 is in contact with the lower template 7. Only at this time can the power module be normally plastic encapsulated. When the upper template 11 moves upward and separates from the lower template 7, the first spring 25 causes the upper top block 22 to eject downward, thereby preventing the plastic encapsulated power module from adhering to the upper template 11 and improving the reliability of the production device.

[0042] A sliding frame 28 that matches the lower template 7 and the lead frame cutting tool head 15 is provided on the outer side of the lead frame cutting tool head 15. Sliding bolts 29 are vertically fixed on the left and right sides of the sliding frame 28. Slideways 30 are fixed on the left and right sides of the lead frame cutting tool head 15. The sliding bolts 29 are connected to the slideways 30 in a vertically sliding manner. A limiting plate 31 is fixed to the top of the sliding bolts 29. A second spring 32 that is respectively fixedly connected to the sliding frame 28 and the slideways 30 is sleeved on the outer side of the sliding bolts 29.

[0043] The cooperation of the second spring 32, the sliding bolt 29 and the sliding frame 28 enables the punching die head 15 to clamp the finished power module after marking when moving downward, preventing displacement during punching and cutting, achieving precise cutting, reducing product defects and scrap rate. At the same time, it prevents the waste frame cut from the power module from sticking to the punching die head 15 after the punching and cutting are completed, further improving the operation stability and reliability of the device.

[0044] A waste slot 33 is connected to the lower right side of the base 1. A support rod 34 fixed to the base 1 is installed on the front side of the waste slot 33. A pushing plate 35 matching the lower template 7 is connected to the upper side of the support rod 34, and the pushing plate 35 and the support block 27 do not interfere with each other.

[0045] After the device completes the punching and cutting operation, the cut power module is located in the groove between the lower plastic sealing mold 8 and the lower template 7. The waste frame generated by the power module is located on the surface of the lower template 7. The pushing plate 35 that matches the lower template 7 and does not interfere with the support block 27 can push the waste frame generated by the upper side cutting operation of the right lower template 7 into the lower waste slot 33 for discharge when the vertical pipe 3 rotates, realizing automatic separation of waste. At the same time, it also makes the structure of the device simple and reliable, helping to reduce the maintenance cost of the device.

[0046] Each lower plastic sealing mold 8 is provided with a lower sliding groove 36 in the middle. A lower ejecting block 37 matching the lower sliding groove is slidably installed inside the lower sliding groove. A ejecting rod 38 is fixed to the lower side of each lower ejecting block 37. A sliding sleeve 39 fixed to the bottom of the lower plastic sealing mold 8 is sleeved outside the ejecting rod 38. A lower top plate 40 is jointly fixed to the lower sides of a plurality of ejecting rods 38. A return spring 41 fixedly connected to the lower top plate 40 and the sliding sleeve 39 respectively is sleeved outside the ejecting rod 38. A top wheel 42 is rotatably installed on the lower side of the lower top plate 40. An arc-shaped block 43 matching the top wheel 42 is fixed to the upper side of the front part of the C-shaped table 19. The left and right ends of the arc-shaped block 43 are also provided with inclined surfaces 20 facing each other.

[0047] When the top wheel 42 is not working, the return spring 41 makes the bottom of the lower ejecting block 37 abut against the upper side of the sliding sleeve 39. At this time, the upper side of the lower ejecting block 37 is flush with the upper side of the plastic sealing lower sliding groove 36. When the power module after punching and cutting rotates to the front side, the roller 18 rotates to the upper side of the front part of the C-shaped plate to lift the lower plastic sealing mold 8 upward. The top wheel 42 rolls from the inclined surface 20 of the arc-shaped block 43 to the upper side of the arc-shaped block 43, thereby jacking up the power module from the lower plastic sealing mold 8, preventing the power module from sticking to the lower plastic sealing mold 8 and facilitating the picking of the processed power module of the device, improving the use convenience of the device.

[0048] Positioning frames 44 matching the lower template 7 are installed at the four corners of the lower template 7, and the positioning frames 44 are fixedly connected to the fixing frame 9.

[0049] The positioning frame 44 fixedly connected to the fixing frame 9 can move up and down following the plastic encapsulation lower template 7. While not affecting the pusher plate 35 to push out the waste materials after the lead cutting, it can accurately position the semi-finished power module on the upper side of the upper template 11, further ensuring the processing accuracy of the device and further improving the product quality.

[0050] The upper template 11 and the lower plastic encapsulation mold 8 are both hollow structures, and both the lower plastic encapsulation mold 8 and the upper template 11 are equipped with a water inlet pipe 45 and a water outlet pipe 46 connected to the inside. A rotary joint 47 is vertically installed in the middle of the vertical pipe 3, and a cooling tank 48 is installed on the lower side of the base 1. A return water pipe 49 matching the cooling tank 48 is fixed on the side of the rotary joint 47. Multiple water outlet pipes 46 are all connected to the upper end of the return water pipe 49 through pipelines, and multiple water inlet pipes 45 are all connected to the output end of the rotary joint 47 through pipelines. A water pump 50 is installed inside the cooling tank 48, and the input end of the rotary joint 47 is connected to the output end of the water pump 50 through a pipeline.

[0051] The rotary joint 47 is a rotating component that does not affect the passage of water. The cooperation of the rotary joint 47 and the vertical pipe 3 enables the water flow generated by the water pump 50 to circulate inside the upper template 11 and the lower plastic encapsulation mold 8 respectively through the water inlet pipe 45 and the water outlet pipe 46, and finally flows into the inside of the cooling tank 48 through the return water pipe 49. While not affecting the overall rotation operation of the lower template 7, it can quickly cool the power module to be plastic encapsulated during the plastic encapsulation operation, thereby shortening the cooling time of the power module plastic encapsulation and accelerating the production speed of the power module.

[0052] A production process of a power module includes the following steps:

[0053] Step 1: Place the semi-finished power module composed of the bonded module chip and the lead frame on the upper side of the lower template 7 on the left side. Subsequently, the upper template 11 is attached to the lower template 7, and the injection molding material is injected into the inner side of the chamber formed by the cooperation of the lower plastic encapsulation mold 8 and the plastic encapsulation cavity 12 through the injection port 13 to form the required shape of the power module.

[0054] Step 2: After waiting for a certain time to cool, the stepping motor 6 rotates, causing the plastic encapsulated power module to rotate to the rear side. The laser marking machine 2 can provide accurate markings, increasing the traceability of the product.

[0055] Step 3: The stepping motor 6 rotates again, rotating the marked power module to the right side. The roller 18 on the lower side of the lower plastic encapsulation mold 8 leaves the C-shaped platform 19, enabling the lower plastic encapsulation mold 8 to move downward. The clearance fit between the lower plastic encapsulation mold 8 and the lower template 7 and the lead cutting tool head 15 can accurately cut off the redundant ribs of the lead frame to complete the lead cutting operation.

[0056] Step 4: The stepping motor 6 continues to rotate, and the pusher plate 35 pushes the waste frame generated by the lead cutting operation away from the lower template 7 and separates it from the power module.

[0057] Step 5: The stepper motor 6 continues to rotate, rotating the processed power module to the front side. The roller 18, through the inclined surface 20 and the C-shaped table 19, lifts the power module upward. The top wheel 42 cooperates with the arc-shaped block 43 to make the lower top block 37 push the processed power module upward and separate it from the lower plastic encapsulation mold 8, facilitating the picking of the processed power module of the device.

[0058] The above embodiments merely exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A power module production device, comprising a base, a laser marking machine is installed on the upper rear side of the base, characterized in that: A vertical tube is rotatably installed on the upper side of the base, and a large gear is concentrically fixed on the lower side of the vertical tube, and a small gear meshing with it is rotatably installed on its side, and a stepping motor connected to the small gear is installed on the lower side of the base, and four lower templates distributed evenly in a circle are fixed on the upper side of the vertical tube, each of the lower templates includes a plurality of lower plastic sealing molds connected to it for sliding up and down, and a fixing frame is commonly fixed on the lower side of each group of lower plastic sealing molds, and a control mechanism for controlling the height of the fixing frame is installed on the upper side of the base, and a first cylinder fixed to the base is installed on the upper side of the lower template on the left side, and an upper template matching the lower template is fixed on the lower side of the output end of the first cylinder, and a plurality of plastic sealing cavities matching the lower plastic sealing molds are provided on the upper side of the upper template, and injection ports are provided on the top of the plastic sealing cavities, and a second cylinder is fixed on the upper side of the right part of the base, and a rib cutting knife head matching the lower plastic sealing mold is fixed on the lower side of the output end of the second cylinder; The control mechanism includes multiple vertical rods fixed to the bottom of the lower template, the fixing frame is connected to the vertical rods in an up and down sliding manner, a limiting plate is fixed to the lower side of the vertical rod, a roller is rotatably installed on the lower side of each of the fixing frames, a C-shaped table matching the roller is horizontally fixed on the upper side of the base, the notch of the C-shaped table faces right, and the front and rear ends of the C-shaped table are provided with upward inclined surfaces.

2. A power module production device according to claim 1, characterized in that: An upper slide groove is opened in the middle of the plurality of plastic sealing cavities, and an upper top block matching it is installed on the inner side of the upper slide groove for sliding up and down. A slide rod is fixed on the upper side of each of the upper top blocks, and a sleeve is sleeved on the outer side of the slide rod for sliding connection with it and fixed to the upper side of the upper template. A first spring is also sleeved on the outer side of the slide rod, and the upper and lower ends of the first spring are respectively fixedly connected to the bottom of the sleeve and the middle part of the slide rod, and a left-right facing horizontal plate is fixed to the top of the slide rod, and support blocks matching the horizontal plate are fixed on the left and right sides of each of the lower templates.

3. A power module production device according to claim 2, characterized in that: A sliding frame matching the lower template and the rib cutting cutter head is provided on the outside of the rib cutting cutter head, sliding bolts are vertically fixed on the left and right sides of the sliding frame, slideways are fixed on the left and right sides of the rib cutting cutter head, the sliding bolt is connected to the slideway for up and down sliding, a limiting plate is fixed on the top of the sliding bolt, and a second spring fixedly connected to the sliding frame and the slideway respectively is sleeved on the outside of the sliding bolt.

4. A power module production device according to claim 3, characterized in that: A waste trough is connected to the lower right side of the base, a support rod fixed to the base is installed on the front side of the waste trough, a push plate matching the lower template is connected to the upper side of the support rod, and the push plate and the support block do not interfere with each other.

5. A power module production device according to claim 4, characterized in that: A sliding groove is opened in the middle of each lower plastic sealing mold, and a lower ejector block matching it is slidably installed on the inner side of the sliding groove, a ejector rod is fixed on the lower side of each lower ejector block, and a sliding sleeve fixed to the bottom of the lower plastic sealing mold is sleeved on the outer side of the ejector rod, a lower ejector plate is fixed to the lower sides of multiple ejector rods, and a return spring fixedly connected to the lower ejector plate and the sliding sleeve is sleeved on the outer side of the ejector rod, a ejector wheel is rotatably installed on the lower side of the lower ejector plate, and an arc block matching the top wheel is fixed on the upper side of the front part of the C-shaped table, and the left and right ends of the arc block are also provided with inclined surfaces facing in the opposite direction.

6. A power module production device according to claim 5, characterized in that: The four corners of the lower template are all equipped with matching positioning frames, and the positioning frames are fixedly connected to the fixing frame.

7. A power module production device according to claim 6, characterized in that: The upper template and the lower plastic sealing mold are both hollow structures, and the lower plastic sealing mold and the upper template are both equipped with a water inlet pipe and a water outlet pipe connected to the inside, a rotating joint is vertically installed in the middle of the vertical pipe, a cooling groove is installed on the lower side of the base, a return pipe matching the cooling groove is fixed on the side of the rotating joint, multiple outlet pipes are connected to the upper end pipeline of the return pipe, multiple inlet pipes are connected to the output end pipeline of the rotating joint, a water pump is installed on the inside of the cooling groove, and the input end of the rotating joint is connected to the output end pipeline of the water pump.

8. A production process for a power module, characterized in that: Using the power module production device according to any one of claims 1 to 7, the specific steps are as follows: Step 1: Place the semi-finished power module consisting of the bonded module chip and the lead frame on the upper side of the lower template on the left, then fit the upper template with the lower template, and inject the injection material into the inner side of the cavity where the lower plastic encapsulation mold and the plastic encapsulation cavity cooperate through the injection port to form the required power module shape. Step 2: Wait for a certain period of time to cool down, and then the stepper motor rotates to rotate the plastic-sealed power module to the rear side. The laser marking machine can provide precise marking, which increases the traceability of the product. Step 3: The stepper motor rotates again to rotate the marked power module to the right. The roller on the lower side of the lower plastic encapsulation mold leaves the C-shaped table to move the lower plastic encapsulation mold downward. The gap between the lower plastic encapsulation mold and the lower template cooperates with the rib cutting head to accurately cut off the excess ribs of the lead frame and complete the rib cutting operation. Step 4: The stepper motor continues to rotate, and the push plate pushes the waste frame generated by the rib cutting operation away from the lower template and separates it from the power module. Step 5: The stepper motor continues to rotate, rotating the processed power module to the front side. The roller lifts the power module upward through the inclined surface and the C-shaped table. The top wheel cooperates with the arc block to enable the lower top block to push the processed power module upward and separate it from the lower plastic packaging mold, making it convenient to remove the processed power module from the device.

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