Positioning and crimping tool

Abstract

The utility model belongs to tooling technical field discloses a kind of positioning crimp tooling. Positioning crimp tooling is used to crimp the installation area of first device and second device, the bottom die of positioning crimp tooling includes support base plate, guide angle and horizontal support assembly, several guide angles are spaced apart along the edge of support base plate, each guide angle is extended along the first direction perpendicular to support base plate, and several guide angles are enclosed to form the limiting interval for second device along the first direction and put into;Horizontal support assembly is set on support base plate and located in limiting interval, and the horizontal support assembly is used to support the installation area of second device, and the support surface area of horizontal support assembly is not less than the area of the installation area of corresponding second device supported. The utility model increases the stress area when crimping, can keep PCBA board in horizontal state during placing process, and ensures that IGBT module and PCBA board are uniformly stressed when crimping.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, and in particular to a positioning and pressing tooling. Background Technology

[0002] IGBT modules have extremely wide applications in many fields such as photovoltaic inverters, electric control drives, new energy vehicles, and charging piles. PCBA boards have multiple mounting areas, and currently, the common practice is to use a press-fit process to mount the IGBT module onto the corresponding mounting area on the PCBA board and form an overall application module.

[0003] In existing technologies, on the one hand, the support portion of the bottom mold of the pressing fixture consists of multiple cylinders. During the pressing process, the PCBA board is first placed on the upper surface of the cylinders, the IGBT module is placed in the corresponding mounting area of ​​the PCBA board, and then the pressing die of the pressing fixture applies downward pressure to the IGBT module. Due to the limited force-bearing area of ​​the cylinders, the support strength decreases under long-term pressing conditions, and the cylinders corresponding to the PCBA board mounting area will undergo certain deformation. The flatness of the support surface formed by the multiple cylinders decreases, resulting in poor flatness of the module after pressing (leading to local stress concentration due to uneven pressure), increasing the probability of module failure and causing incalculable damage to the performance of the final product. On the other hand, due to the lack of a corresponding guiding mechanism, the PCBA board is prone to collision with surrounding components during the process of placing it into the bottom mold. Utility Model Content

[0004] The purpose of this invention is to provide a positioning and pressing fixture that can not only guide the PCBA board to be placed accurately and keep the PCBA board in a horizontal state after placement, but also increase the corresponding force-bearing area during pressing, ensuring that the IGBT module and the PCBA board are subjected to uniform force during pressing.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A positioning and pressing fixture is used to press a first component and a second component together. The positioning and pressing fixture includes a bottom mold, which includes:

[0007] Support base plate;

[0008] The guide corner protectors are provided in a plurality of them, and the plurality of guide corner protectors are spaced apart along the edge of the support base plate. Each guide corner protector extends along a first direction perpendicular to the support base plate. The plurality of guide corner protectors surround and form a limiting range for the second device to be placed along the first direction.

[0009] A horizontal support component is disposed on the support base plate and located within the limiting range. The horizontal support component is used to support the mounting area of ​​the second device, and the area of ​​the support surface of the horizontal support component is not less than the area of ​​the mounting area of ​​the corresponding second device.

[0010] As an optional solution for positioning and pressing fixtures, the horizontal support assembly includes a first layer of support blocks and a second layer of support blocks stacked along the first direction, with the second layer of support blocks mounted on the support base plate.

[0011] As an optional solution for positioning and pressing tooling, the first layer support block is provided with a number of clearance grooves, which are used to avoid the protruding structure on the second device.

[0012] As an optional solution for positioning and pressing fixtures, the first layer support block is provided with a number of first connecting holes, the second layer support block is provided with a number of second connecting holes, and the support base plate is provided with a number of third connecting holes. Fasteners can pass through the first connecting holes and the second connecting holes in sequence and connect with the third connecting holes.

[0013] As an optional solution for positioning and pressing fixtures, the first layer support block is provided with a number of first alignment holes, the second layer support block is provided with a number of second alignment holes, and the support base plate is provided with a number of third alignment holes. The positioning pin can be inserted into the first alignment holes, the second connection holes and the third alignment holes in sequence.

[0014] As an optional solution for positioning and pressing fixtures, the first layer support block and the second layer support block have the same volume. The first layer support block is made of chrome steel, and the second layer support block is made of aluminum alloy.

[0015] As an optional solution for the positioning and pressing fixture, the second device is provided with positioning holes, and the bottom mold further includes:

[0016] A positioning post is provided on the support base plate. A positioning rod is provided at the end of the positioning post away from the support base plate. The diameter of the positioning rod is smaller than the diameter of the positioning post. The positioning hole of the second device passes through the positioning rod and is inserted into the positioning post.

[0017] As an optional solution for the positioning and pressing fixture, the bottom mold further includes:

[0018] A support column is disposed on the support base plate, and the support surface of the support column is located on the same horizontal plane as the support surface of the horizontal support assembly. The support column is used to support the second device.

[0019] As an optional solution for the positioning and pressing fixture, the end of the guide corner guard away from the supporting base plate is provided with a guide slope; and / or

[0020] A fourth connecting hole is provided at the corner of the supporting base plate, and a fifth connecting hole is provided at the guide corner guard. The connector passes through the fifth connecting hole and connects with the fourth connecting hole.

[0021] As an optional solution for the positioning and pressing tooling, the positioning and pressing tooling further includes a pressing mold. One end face of the pressing mold is used to press the product to be pressed onto the bottom mold. The other end face of the pressing mold is provided with a venting groove, and at least one end of the venting groove penetrates the side wall of the pressing mold.

[0022] The beneficial effects of this utility model are:

[0023] The positioning and pressing fixture provided by this utility model has multiple guide corner protectors extending along a first direction at the edge of the supporting base plate, and a horizontal support assembly is provided on the supporting base plate. Since the multiple guide corner protectors form a limiting area, during the material feeding stage before pressing, the second component is first placed within the limiting area and lowered along the first direction onto the horizontal support assembly. The lower surface of the second component's mounting area contacts the plane of the horizontal support assembly, ensuring that the second component is in a horizontal state. The addition of guide corner protectors to the supporting base plate serves two purposes: firstly, the guide corner protectors act as guides, allowing the PCBA board to be placed vertically downwards along the surrounding guide corner protectors, preventing components on the PCBA board from bumping into the fixture and eliminating collisions; secondly, the guide corner protectors act as limiting elements, preventing the PCBA board from shifting horizontally and ensuring precise alignment with the horizontal support assembly. Then, the first component to be pressed is placed on the upper surface of the second component's mounting area, corresponding to the position of the horizontal support assembly. When the first device is pressed downwards, since the supporting surface area of ​​the horizontal support component is not less than the area of ​​the second device mounting area, by increasing the force-bearing area of ​​the horizontal support component, not only can the force between the first and second devices be uniform during the pressing process, ensuring the flatness of the module after pressing, but also reducing the deformation under long-term fatigue pressure. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the assembly of the bottom mold of the positioning and pressing tool in an embodiment of this utility model;

[0026] Figure 2 This is an exploded view of the bottom mold of the positioning and pressing tool in an embodiment of this utility model;

[0027] Figure 3 This is an exploded view of the horizontal support component in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the pressing die of the positioning and pressing tool in the embodiment of this utility model.

[0029] Figure label:

[0030] 100. Bottom mold; 200. Press mold; 201. Venting strip groove;

[0031] 1. Support base plate; 2. Guide corner protectors; 3. Horizontal support assembly; 4. Positioning post; 5. Positioning rod; 6. Support post;

[0032] 11. Third connecting hole; 12. Third alignment hole; 13. Fourth connecting hole;

[0033] 21. Guide slope; 22. Fifth connecting hole;

[0034] 31. First layer support block; 311. Avoidance groove; 312. First connecting hole; 313. First alignment hole; 32. Second layer support block; 321. Second connecting hole; 322. Second alignment hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0039] In today's rapidly developing field of electronic power, especially in key application scenarios such as photovoltaic inverters, electric control drives, new energy vehicles, and charging piles, IGBT (Insulated Gate Bipolar Transistor) modules have demonstrated extremely broad application prospects due to their superior performance and reliability. As a core component of power electronic systems, IGBT modules undertake the important tasks of power conversion and control, and their performance stability and reliability are directly related to the operating efficiency and safety of the entire system.

[0040] In practical applications of IGBT modules, accurately and securely mounting them onto the corresponding mounting area on the PCBA (Printed Circuit Board Assembly) is crucial for ensuring the normal and efficient operation of the entire application module. Currently, the industry commonly uses a crimping process to achieve a reliable connection between the IGBT module and the PCBA board. This process uses specific crimping fixtures to precisely press the IGBT module onto the designated position on the PCBA board, ensuring a tight bond between the two and forming a fully functional application module.

[0041] However, the design of the bottom mold for crimping fixtures has certain limitations in the existing technical system. Specifically, the support portion on the bottom mold of the crimping fixture is usually composed of multiple independent cylinders. This design may meet basic support requirements in the initial use, but a series of problems will gradually emerge during long-term, frequent crimping operations.

[0042] First, with prolonged use and increased crimping cycles, the cylindrical support structure experiences a significant decrease in strength due to continuous pressure. The force that initially stably supported the IGBT module gradually weakens, resulting in insufficient support during crimping. Second, the cylindrical support structure, subjected to prolonged high pressure, undergoes deformation. This deformation is not uniform but can reduce the flatness of various parts of the support. The originally smooth support surface becomes uneven, preventing the IGBT module from achieving uniform and tight contact with the PCBA board during crimping. The reduced flatness of the support structure also worsens the flatness of the IGBT module after crimping. In practical applications, IGBT modules often have multi-layered structures. When flatness is poor, uneven pressure distribution between these layers can cause localized stress concentrations. These localized stress concentrations damage the module's internal microstructure; over time, this damage accumulates, significantly increasing the probability of module failure.

[0043] A failure of an IGBT module can have a severe negative impact on the operation of the entire electronic power system. In photovoltaic inverter systems, it may lead to a decrease in power conversion efficiency, affecting power generation; in electric control and drive systems, it may cause drive anomalies, leading to equipment malfunction; in new energy vehicles, it may affect vehicle power performance and range; in the charging pile field, it may lead to reduced charging efficiency and even safety hazards. These consequences will cause incalculable damage to the performance of the final product, seriously affecting its market competitiveness.

[0044] To increase the force-bearing area during crimping and to ensure the PCBA board remains horizontal during placement, guaranteeing uniform force distribution during the crimping of the IGBT module and the PCBA board, this embodiment provides a positioning crimping fixture. The following describes the fixture in conjunction with... Figures 1 to 4 The specific content of this embodiment will be described in detail. It should be noted that the first direction mentioned in this embodiment is... Figure 1 The Z direction in the equation.

[0045] In this embodiment, the main function of the positioning and pressing fixture is to accurately press the mounting areas of the first device and the second device together. For example, in practical applications, the first device can be an IGBT module, and the second device can be a PCBA board. The positioning and pressing fixture includes a key component: a base mold 100. The base mold 100 includes a supporting base plate 1, guide corner protectors 2, and a horizontal support assembly 3. The supporting base plate 1 serves as the basic structure of the entire base mold 100, providing a stable mounting platform for other components. Several guide corner protectors 2 are provided on the edge of the supporting base plate 1. For example, the guide corner protectors 2 are arranged at circumferential intervals at the corners of the supporting base plate 1, and each guide corner protector 2 extends along a first direction perpendicular to the supporting base plate 1 (which can also be understood as a vertical direction). The guide corner protectors 2 enclose a limiting area for the second device to be placed along the first direction; the number and position of the guide corner protectors 2 ensure that the second device can be effectively guided and restricted in all directions. For example, guide corner protectors 2 are installed at the four corners of the support base plate 1, forming an approximately rectangular limiting range that can accommodate common rectangular PCBA boards. A horizontal support assembly 3 is mounted on the support base plate 1 and located within the limiting range. The main function of the horizontal support assembly 3 is to place the second component. In its design, the area of ​​the support surface of the horizontal support assembly 3 is not less than the area of ​​the mounting area of ​​the corresponding second component. A larger support surface area provides a wider support surface, ensuring that both the first and second components receive uniform support during the crimping process.

[0046] The positioning and pressing fixture provided in this embodiment, during the material feeding stage before pressing, allows the operator to easily place the second component into a limiting zone formed by multiple guide corner protectors 2, and lower it onto the horizontal support component 3 along the first direction. During this process, the lower surface of the second component mounting area can fit against the horizontal support component 3, ensuring the second component is in an absolutely horizontal state. This horizontal state is crucial for subsequent pressing operations, as any slight tilt can lead to uneven pressing, thus affecting product quality. The guide corner protectors 2 play a dual key role in the material feeding process. Firstly, they act as guides. Taking a PCBA board as an example, when the operator places the PCBA board into the limiting zone, the PCBA board will be placed vertically downwards along the surrounding guide corner protectors 2. This vertical placement prevents the PCBA board from shifting or wobbling during descent, ensuring accurate placement. Simultaneously, the presence of the guide corner protectors 2 effectively prevents components on the PCBA board from bumping into the fixture. In traditional crimping fixtures, the lack of effective guidance and protection measures makes it easy for PCBA boards to collide with the fixture during placement, leading to component damage and affecting the overall product performance. However, the positioning crimping fixture in this embodiment, through the design of the guide corner protector 2, fundamentally eliminates this collision, significantly improving the product yield. Furthermore, the guide corner protector 2 acts as a limiting element. After the PCBA board is placed on the horizontal support assembly 3, the guide corner protector 2 restricts horizontal displacement of the PCBA board. This is because any horizontal movement during crimping can cause changes in the relative positions of the first and second components, affecting the crimping accuracy and quality. Through the limiting effect of the guide corner protector 2, the PCBA board can precisely fit with the support assembly, providing a stable foundation for subsequent crimping operations.

[0047] The positioning and pressing fixture provided in this embodiment, after completing the second component placement operation, places the first component to be pressed onto the upper surface of the second component mounting area, corresponding to the position of the horizontal support component 3. When the first component is pressed downwards, the design advantage that the area of ​​the supporting surface of the horizontal support component 3 is not less than the area of ​​the second component mounting area is fully realized. By increasing the force-bearing area of ​​the horizontal support component 3, the force between the first and second components during the pressing process can be more uniform. In traditional pressing fixtures, due to the small force-bearing area, the pressure is often concentrated in local areas, resulting in uneven contact between the first and second components, easily leading to problems such as loose pressing or excessive local stress. However, the positioning and pressing fixture in this embodiment, through the large area support of the horizontal support component 3, evenly distributes the pressure across the entire contact surface, ensuring a tight fit between the first and second components, thereby guaranteeing the flatness of the module after pressing. Flatness is an important indicator of product quality; good flatness ensures greater stability and reliability of the product during subsequent use, reducing malfunctions and problems caused by poor flatness.

[0048] Furthermore, reducing deformation under long-term fatigue stress is also a significant technical benefit of this positioning and crimping fixture. During the use of electronic products, they are often subjected to various forms of pressure and vibration. If the crimped portion deforms, it will affect the product's performance and lifespan. The positioning and crimping fixture in this embodiment, through its uniform force distribution design, reduces the degree of localized stress concentration, thereby reducing the possibility of deformation in the first and second components under long-term fatigue stress. This not only improves product reliability but also extends its service life, bringing greater value to the user.

[0049] Furthermore, the horizontal support assembly 3 includes a first layer of support blocks 31 and a second layer of support blocks 32 stacked along a first direction, with the second layer of support blocks 32 mounted on the support base plate 1. By dividing the horizontal support assembly 3 into the first layer of support blocks 31 and the second layer of support blocks 32, operators can move the first layer of support blocks 31 and the second layer of support blocks 32 separately, significantly reducing labor intensity. For example, an integrated horizontal support assembly 3 that previously required multiple people to move can now be easily moved by a single person, either the first layer of support blocks 31 or the second layer of support blocks 32. This not only improves operational efficiency but also reduces the probability of operational errors and safety accidents caused by difficulties in handling. Simultaneously, convenient handling and movement allow the positioning and pressing fixture to adapt to changes in the production line more quickly, improving production flexibility and response speed. During production, the horizontal support assembly 3 may require maintenance or replacement due to long-term use, wear, or the need to adapt to pressing different specifications of components. With the layered design, maintenance and replacement become much simpler. When maintenance of the horizontal support assembly 3 is required, the operator can disassemble only one layer of the first-layer support block 31 or the second-layer support block 32 without disassembling the entire integrated assembly. This reduces maintenance time and workload, and lowers maintenance costs. For example, if wear is found on the surface of the first-layer support block 31, only the first-layer support block 31 needs to be removed for repair or replacement, without touching the second-layer support block 32 and the support base plate 1, thus avoiding other problems that may be caused by disassembling too many parts. Similarly, when the horizontal support assembly 3 needs to be replaced to accommodate the crimping of devices of different specifications, only the support blocks of the corresponding layer need to be replaced according to the requirements of the new device, greatly improving the versatility and adaptability of the tooling.

[0050] Furthermore, the first support block 31 and the second support block 32 have the same volume. The first support block 31 is made of chromium steel, while the second support block 32 is made of aluminum alloy. Chromium steel is an alloy steel with high strength and excellent wear resistance. As the part that directly contacts the device to be crimped, the first support block 31 needs to withstand significant pressure and friction. Using chromium steel ensures that the first support block 31 is not easily deformed or worn during long-term use, thus providing stable and reliable support for the device to be crimped. For example, during the crimping process of IGBT modules and PCBA boards, the PCBA board and the IGBT module themselves have a certain weight and generate significant pressure during crimping. The chromium steel first support block 31 can withstand this pressure without significant deformation, ensuring the accuracy and quality of the crimping. In addition, the high strength of chromium steel allows the first support block 31 to adapt to the crimping of devices of different specifications and models, exhibiting good versatility and adaptability. Aluminum alloy is characterized by its light weight and high strength. The second-layer support block 32 is installed on the support base plate 1, mainly serving to support the first-layer support block 31 and transmit pressure. Using aluminum alloy significantly reduces the weight of the entire horizontal support assembly 3, facilitating manual handling and installation. On the production line, the positioning and pressing fixtures frequently need to be adjusted and replaced; the lighter weight allows operators to complete these tasks more easily, improving production efficiency. Simultaneously, the aluminum alloy material has excellent corrosion resistance, maintaining stable performance under different working conditions and extending the service life of the horizontal support assembly 3.

[0051] Furthermore, the first-layer support block 31 is provided with several clearance grooves 311, which are used to avoid protruding structures on the second device. In practical applications, the lower surface of the PCBA board may have protruding structures such as capacitors, chips, or resistors. If these protruding structures come into direct contact with the horizontal support component 3 during the pressing process, they are easily squeezed and damaged, leading to PCBA board failure. To avoid this situation, multiple clearance grooves 311 are provided on the first-layer support block 31 at the positions corresponding to the protruding structures. The shape and size of the clearance grooves 311 are designed according to the actual situation of the protruding structures on the PCBA board. For example, for a cylindrical capacitor protrusion, the clearance groove 311 can be designed as a circle with a diameter slightly larger than the diameter of the capacitor and a depth sufficient to fully accommodate the protruding part of the capacitor; for a square chip protrusion, the clearance groove 311 is designed as a corresponding square to ensure that the chip can be fully embedded in the groove. Through this precise design, when the PCBA board is placed on the first support block 31, its protruding structure can accurately embed into the avoidance groove 311, avoiding direct contact with the first support block 31 and thus preventing squeezing and damage during the pressing process. The design of the avoidance groove 311 makes the placement of the PCBA board more accurate and faster, eliminating the need for operators to spend a lot of time adjusting the position of the PCBA board to avoid collisions between the protruding structure and the support block, further improving production efficiency. At the same time, this design also reduces the technical requirements for operators, reduces quality problems caused by improper operation, and makes the production process more stable and controllable.

[0052] Furthermore, the first-layer support block 31 is provided with several first connecting holes 312, the second-layer support block 32 is provided with several second connecting holes 321, and the support base plate 1 is provided with several third connecting holes 11. Fasteners can pass through the corresponding first connecting holes 312 and second connecting holes 321 in sequence and connect with the third connecting holes 11. The fasteners can be, but are not limited to, bolts or screws, etc. Through threaded connection, the fasteners pass through the corresponding first connecting holes 312 and second connecting holes 321 in sequence and connect with the third connecting holes 11, forming a tight and stable connection structure. The engagement of the threads generates a large frictional force between the components, which can effectively resist external forces and prevent relative displacement of the components during the crimping process. For example, during the crimping process of the IGBT module and the PCBA board, a large pressure and vibration will be generated. The threaded connection can ensure that the layers of the horizontal support assembly 3 remain tightly connected, providing stable support for the crimping process and ensuring the crimping quality. Threaded connections offer detachability, allowing operators to easily disassemble and reassemble fasteners when maintenance, component replacement, or structural adjustments are needed for the horizontal support assembly 3. Compared to non-detachable connections such as welding, threaded connections significantly improve equipment maintainability and reduce repair time and costs. For example, when the first-layer support block 31 wears out due to long-term use, only the corresponding fasteners need to be removed to replace the first-layer support block 31, without requiring extensive disassembly and repair of the entire horizontal support assembly 3. Threaded connections also possess a degree of elasticity, allowing them to adapt to a certain degree of deformation and vibration. In actual production environments, equipment may be affected by factors such as temperature changes and mechanical vibrations, leading to slight relative displacements between components. The elasticity of threaded connections can absorb these displacements, avoiding stress concentration and damage caused by rigid connections, thus improving the adaptability and reliability of the horizontal support assembly 3.

[0053] Furthermore, the first-layer support block 31 is provided with several first alignment holes 313, the second-layer support block 32 is provided with several second alignment holes 322, and the support base plate 1 is provided with several third alignment holes 12. Positioning pins can be sequentially inserted into the corresponding first alignment holes 313, second alignment holes 321, and third alignment holes 12. Before assembling the horizontal support assembly 3, the positioning pins are sequentially inserted into the corresponding first alignment holes 313, second alignment holes 322, and third alignment holes 12. This operation can quickly and accurately fix the positions of the first-layer support block 31, the second-layer support block 32, and the support base plate 1, ensuring that the relative positional relationship between the three meets the design requirements. For example, during assembly, even if the operator's hand experiences slight tremors or movement, the positioning pins can ensure that the components do not undergo relative displacement, thereby avoiding subsequent problems caused by assembly position deviations, such as inaccurate pressing or uneven force on components. The insertion of the positioning pins provides precise guidance for the assembly of the fasteners. After the positioning pins secure the components, fasteners (such as bolts or screws) can pass more accurately through the corresponding first connecting hole 312, second connecting hole 321, and third connecting hole 11. This not only reduces fastener offset and tilting during assembly, improving connection stability, but also prevents component damage or loosening due to improper fastener assembly. For example, when tightening bolts, because the positions of each component are precisely fixed by the positioning pins, the bolts can smoothly engage with the nuts, generating uniform preload and ensuring the reliability of the entire connection structure. Using positioning pins for alignment ensures that each assembly process follows the same standard. Regardless of whether assembly is performed by different operators or at different times, the positional relationship between the first support block 31, the second support block 32, and the support base plate 1 remains consistent. This is crucial for mass production, ensuring that each horizontal support component 3 has the same performance and quality, improving product stability and reliability. Simultaneously, it reduces quality fluctuations caused by assembly differences, lowering the defect rate during production.

[0054] Furthermore, the second device is provided with several positioning holes, and the bottom mold 100 also includes several positioning posts 4. Positioning posts 4 are provided on the supporting base plate 1 corresponding to the positioning holes, and the positioning posts 4 are inserted into the positioning holes. By adding positioning posts 4 and positioning holes, positioning accuracy can be improved. When the PCBA board is placed into the bottom mold 100, the positioning posts 4 accurately insert into the positioning holes, instantly fixing the position of the PCBA board and ensuring that its relative position in the horizontal and vertical directions meets the design requirements. This basic positioning function provides a precise reference for subsequent crimping operations, avoiding crimping problems caused by PCBA board positional deviations, such as increased contact resistance and unstable electrical connections. Through the precise cooperation of the positioning posts 4 and positioning holes, the position of each PCBA board placed can be guaranteed to be consistent. Whether in large-scale production or small-batch customization, it can be ensured that each PCBA board is in the same position in the bottom mold 100, thus enabling the crimping process to be carried out according to a uniform standard. This not only improves the assembly quality of the product and reduces quality fluctuations caused by assembly differences, but also improves the stability and reliability of the product. For example, in some electronic devices with extremely high electrical performance requirements, precise positioning can ensure a more reliable electrical connection between the PCBA board and the IGBT module, avoiding problems such as signal interference and power loss caused by poor contact, and improving the overall performance of the equipment.

[0055] Furthermore, a positioning rod 5 is provided at the end of the positioning post 4 furthest from the supporting base plate 1. The diameter of the positioning rod 5 is smaller than the diameter of the positioning post 4. The extended top of the positioning rod 5 plays an important guiding role. When the PCBA board is placed into the bottom mold 100, the traditional positioning post 4 is set to 5 to 6 in order to position the PCBA board. However, the PCBA board has certain deviations in the positioning holes due to machining accuracy errors, which causes the PCBA board to get stuck when placing and removing it, causing great inconvenience to the operation. However, removing the positioning post 4 of the fixture is not conducive to the positioning of the PCBA board. Based on this, while introducing the fixture guide corner protector 2, the number of positioning posts is reduced to 2 to 3, and the positioning rod 5 at the top of the positioning post 4 is lengthened to play a certain guiding role. Even if there is a certain deviation in the position of the positioning hole, the positioning rod 5 can still contact the positioning hole first. Due to its small diameter, it can smoothly enter the edge area of ​​the positioning hole, guide the PCBA board to gradually adjust its position, and finally make the positioning post 4 accurately inserted into the positioning hole. This guiding function provides a clear path for the placement of the PCBA board, greatly reducing jamming caused by positioning deviations and improving the smoothness and efficiency of the operation. It should be noted that the top of the positioning rod 5 should not be too long. If the positioning rod 5 is too high, the pressing plate of the crimping machine may press against the positioning rod 5 during the crimping process, causing deformation or damage to the positioning rod 5, thus affecting positioning accuracy. By reasonably controlling the height of the positioning rod 5, its guiding function is effectively utilized while avoiding interference with the pressing plate of the crimping machine, achieving a balance between function and safety.

[0056] For example, the bottom mold 100 also includes support columns 6. A plurality of support columns 6 are provided on the support base plate 1. The support surface of the support columns 6 is located on the same horizontal plane as the support surface of the horizontal support assembly 3. The support columns 6 are used to support the second device. During use, the second device can be placed horizontally on both the horizontal support assembly 3 and the support columns 6 simultaneously. By adding multiple support columns 6, the upper surface of the support columns 6 can provide some support to the non-installation area of ​​the second device, further ensuring that the second device is placed horizontally.

[0057] Furthermore, a guide ramp 21 is provided at the end of the guide corner guard 2 furthest from the supporting base plate 1. When preparing to place the PCBA board onto the bottom mold 100, the guide ramp 21 plans a precise sliding path for the PCBA board. The inclination angle of the guide ramp 21 ensures that the PCBA board slides smoothly under gravity, while avoiding collision damage due to excessively large angles causing the PCBA board to slide too fast, or ineffective guidance due to excessively small angles. This precise guidance directly improves production efficiency. Operators do not need to spend a lot of time and effort on precise alignment when placing the PCBA board; they only need to roughly place the PCBA board near the guide ramp 21, and the guide ramp 21 will guide the PCBA board into the bottom mold 100 quickly and accurately. This not only shortens the assembly time of a single product but also increases the flow rate of the entire production line.

[0058] For example, a fourth connecting hole 13 is provided at the corner of the support base plate 1, and a fifth connecting hole 22 is provided for the guide corner protector 2. The connector passes through the fifth connecting hole 22 and connects to the fourth connecting hole 13. A tight connection is achieved through the connector, forming a stable overall structure. This connection method has extremely high stability and can effectively resist various external forces generated during the crimping process. For example, when the crimping machine crimps the PCBA board and IGBT module, it generates significant pressure and vibration. The stable connection structure ensures that the guide corner protector 2 will not loosen or shift due to these external forces, thus guaranteeing its stable and reliable limiting and guiding function for the PCBA board. The design of the connecting holes and connectors improves the convenience of installation and maintenance. During installation, operators can quickly assemble the guide corner protector 2 and the support base plate 1 without using complex tools or performing cumbersome operations. Furthermore, if the guide corner protector 2 is damaged or needs replacement during use, operators can easily disassemble the connector, remove the guide corner protector 2 for replacement, greatly shortening maintenance time and improving equipment availability.

[0059] During the crimping process, the crimping machine's pressure plate comes into close contact with the upper surface of the crimping mold 200. Ideally, the contact surface is flat and smooth. While this characteristic is beneficial to the uniform transmission of crimping force to some extent, it also causes a thorny problem. When the pressure plate rises after completing the crimping action, due to the excessive smoothness of the contact surface, a relatively sealed space is formed between the pressure plate and the upper surface of the crimping mold 200 according to the principle of atmospheric pressure. Under the action of atmospheric pressure, the pressure plate will tightly adhere to the crimping mold 200. However, as the pressure plate continues to rise, when the adsorption force can no longer support the weight of the crimping mold 200, the crimping mold 200 will suddenly detach from the pressure plate under its own gravity and fall freely onto the IGBT module and PCBA board placed on the bottom mold 100. This sudden impact force may cause serious physical damage to the IGBT module and PCBA board, such as chip breakage and circuit board deformation, thereby affecting the performance and reliability of the entire electronic product, leading to product scrap and increased production costs.

[0060] Furthermore, the positioning and pressing fixture also includes a pressing mold 200. One end face of the pressing mold 200 is used to press against the bottom mold 100, and the other end face of the pressing mold 200 is provided with a venting groove 201, at least one end of which penetrates the side wall of the pressing mold 200. To simultaneously solve the problems of mold 200 adsorption and falling off and pressing accuracy, a slotting design is introduced, that is, the venting groove 201 is chiseled out on the upper surface of the pressing mold 200. The design of the venting groove 201 disrupts the continuity of the contact surface on the upper surface of the pressing mold 200. When the pressing plate of the pressing machine contacts the upper surface of the pressing mold 200, air can flow between the pressing plate and the pressing mold 200 through the venting groove 201, breaking the originally relatively sealed space. According to the principles of fluid mechanics, the airflow reduces the atmospheric pressure difference between the pressing plate and the upper surface of the pressing mold 200, thereby significantly weakening the adsorption force of the pressing plate of the pressing machine on the pressing mold 200. In this way, the pressure mold 200 will not suddenly fall due to strong suction during the rising process of the pressure plate, effectively avoiding the risk of damaging the IGBT module and PCBA board, and ensuring the safety of the production process and the integrity of the product.

[0061] To prevent the die 200 from rusting, a surface anti-rust treatment is necessary. Several common surface treatment methods exist. For example, galvanizing is a frequently used method. By plating a zinc layer onto the surface of the die 200, a dense oxide film is formed, preventing oxygen and moisture from contacting the die substrate, thus preventing rust. Galvanizing has advantages such as low cost and simple process, making it suitable for applications where rust prevention requirements are not particularly high. Another commonly used surface treatment method is blackening, also known as bluing. Blackening involves a chemical oxidation reaction to form a black oxide film on the surface of the die 200. This oxide film has a certain degree of rust prevention and wear resistance. The advantage of blackening is that the treated die 200 has an aesthetically pleasing appearance and minimal impact on its dimensional accuracy. For die 200s with higher requirements for rust prevention and wear resistance, powder coating can also be used. Powder coating is a process in which plastic powder is applied to the surface of the mold 200 via electrostatic spraying, followed by high-temperature baking to melt and solidify the powder, forming a uniform and dense plastic coating. Powder coating offers advantages such as rust prevention, wear resistance, and corrosion resistance, significantly improving the service life and performance of the mold 200.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A positioning and pressing fixture for pressing together the mounting areas of a first device and a second device, characterized in that, The positioning and pressing fixture includes a bottom mold (100), and the bottom mold (100) includes: Support base plate (1); A plurality of guide corner protectors (2) are provided, and the plurality of guide corner protectors (2) are spaced apart along the edge of the support base plate (1). Each guide corner protector (2) extends along a first direction perpendicular to the support base plate (1). The plurality of guide corner protectors (2) surround and form a limiting range for the second device to be placed along the first direction. A horizontal support component (3) is disposed on the support base plate (1) and located within the limiting range. The horizontal support component (3) is disposed corresponding to the installation area of ​​the second device. The horizontal support component is used to support the installation area of ​​the second device, and the support surface area of ​​the horizontal support component (3) is not less than the area of ​​the installation area of ​​the second device it supports.

2. The positioning and pressing fixture according to claim 1, characterized in that, The horizontal support assembly (3) includes a first layer support block (31) and a second layer support block (32) stacked along the first direction, and the second layer support block (32) is installed on the support base plate (1).

3. The positioning and pressing fixture according to claim 2, characterized in that, The first layer support block (31) is provided with a plurality of clearance grooves (311), which are used to avoid the protruding structure on the second device.

4. The positioning and pressing fixture according to claim 2, characterized in that, The first layer support block (31) is provided with a plurality of first connecting holes (312), the second layer support block (32) is provided with a plurality of second connecting holes (321), and the support base plate (1) is provided with a plurality of third connecting holes (11). Fasteners can pass through the first connecting holes (312) and the second connecting holes (321) in sequence and connect with the third connecting holes (11).

5. The positioning and pressing fixture according to claim 4, characterized in that, The first layer support block (31) is provided with a plurality of first alignment holes (313), the second layer support block (32) is provided with a plurality of second alignment holes (322), and the support base plate (1) is provided with a plurality of third alignment holes (12). The positioning pin can be inserted into the first alignment hole (313), the second connecting hole (321) and the third alignment hole (12) in sequence.

6. The positioning and pressing fixture according to claim 2, characterized in that, The first layer support block (31) and the second layer support block (32) have the same volume. The first layer support block (31) is made of chromium steel, and the second layer support block (32) is made of aluminum alloy.

7. The positioning and pressing tooling according to claim 1, characterized in that, The second device is provided with positioning holes, and the bottom mold (100) further includes: A positioning post (4) is provided on the supporting base plate (1). A positioning rod (5) is provided at one end of the positioning post (4) away from the supporting base plate (1). The diameter of the positioning rod (5) is smaller than the diameter of the positioning post (4). The positioning hole of the second device passes through the positioning rod (5) and is inserted into the positioning post (4).

8. The positioning and pressing tooling according to claim 1, characterized in that, The bottom mold (100) also includes: A support column (6) is provided on the support base plate (1). The support surface of the support column (6) is located on the same horizontal plane as the support surface of the horizontal support assembly (3). The support column (6) is used to support the second device.

9. The positioning and pressing tooling according to claim 1, characterized in that, The guide corner guard (2) is provided with a guide slope (21) at one end away from the supporting base plate (1); and / or The support base plate (1) is provided with a fourth connecting hole (13) at the corner, and the guide corner guard (2) is provided with a fifth connecting hole (22). The connector passes through the fifth connecting hole (22) and connects to the fourth connecting hole (13).

10. The positioning and pressing tooling according to any one of claims 1-9, characterized in that, The positioning and pressing tooling also includes a pressing mold (200), one end face of which is used to press the product to be pressed on the bottom mold (100), and the other end face of the pressing mold (200) is provided with a venting strip groove (201), at least one end of which penetrates the side wall of the pressing mold (200).

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