Welding jig for metal powder injection molding part and welding method of welding jig

Abstract

The invention relates to the technical field of metal powder injection molding (MIM) part machining, in particular to a metal powder injection molding part welding jig which comprises a base, a bearing table and a pressing mechanism, the bearing table is connected with the base through a supporting piece, a bearing module is embedded in the bearing table, and the pressing mechanism is arranged on the bearing table. A strip-shaped limiting groove is formed in the bearing surface of the bearing module; the pressing mechanism is connected with the base through the lifting mechanism and comprises a pressing cover plate, and the pressing surface of the pressing cover plate is provided with limiting protrusions corresponding to the limiting grooves; when the pressing cover plate is pressed to the bearing face, the limiting groove and the limiting protrusion form profiling clamping limiting of the metal powder injection molding part to be welded, the limiting groove and the limiting protrusion are used for clamping the metal powder injection molding part to be welded in a matched mode, it is ensured that multiple sections of super-long-size parts are stably positioned in the welding process, and the welding quality is improved. The flatness and the straightness of a welding part are ensured to meet the requirements, and the welding yield of final parts is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal powder injection molding (MIM) part processing, and particularly relates to a welding jig for metal powder injection molded parts and a welding method thereof. Background Art

[0002] In the metal powder injection molding (MIM) process, due to the limitations of the molding process, the injection length of metal powder injection molded parts usually cannot reach ultra-long dimensions. When the part length exceeds 150 mm, the conventional metal powder injection molding process cannot meet the production requirements. At this time, laser welding technology is usually required to achieve the splicing of multi-segment parts. As a high-precision and high-efficiency welding method, laser welding can effectively weld ultra-long metal powder injection molded parts. The welding process is a key step in determining the final performance and quality of the parts. However, in the traditional welding method for metal powder injection molded parts, there is a significant technical problem - during the welding process, due to temperature changes and thermal stress, the parts are prone to local deformation, especially during multi-segment welding. This deformation not only affects the dimensional accuracy of the parts, but also may cause the flatness and straightness of the parts to exceed the requirements, thus affecting the welding quality and even making the welded parts unable to meet the use requirements.

[0003] Currently, in response to this problem, although there are some welding jig design schemes, most of the jig designs fail to effectively prevent the deformation of parts during welding. In some traditional jigs, a fixed support structure is used. Although it can provide a certain support effect, in actual applications, these jigs lack flexibility and cannot adapt to parts of different shapes and sizes. Especially for ultra-long metal powder injection molded parts (over 150 mm), the clamping methods of existing jigs are difficult to maintain sufficient accuracy and stability, so they cannot effectively prevent the deformation of parts during welding.

[0004] Therefore, how to design a welding jig that can ensure the stability and non-deformation of metal powder injection molded parts during welding, adapt to the requirements of multi-segment welding, and solve the accuracy control problem in the welding of ultra-long parts has become an urgent technical problem in the current technology. Summary of the Invention

[0005] (1) The technical problem to be solved by the present invention is that the existing welding jigs for metal powder injection molded parts are prone to cause part deformation due to thermal stress and temperature changes during multi-segment welding of ultra-long dimensions (over 150 mm), affecting the welding quality and dimensional accuracy. In addition, the fixed support structure of traditional jigs cannot adapt to parts of different sizes, resulting in insufficient positioning accuracy and stability.

[0006] (2) Technical Solution To solve the above technical problems, an embodiment of the present invention provides a welding jig for metal powder injection molding parts, including a base, a carrier table and a pressing mechanism. Among them, the base is configured with a support and a lifting mechanism; the carrier table is connected to the base through the support, and a carrier module is embedded in the carrier table. The bearing surface of the carrier module is flush with the bearing surface of the carrier table, and strip-shaped limiting grooves are provided on the bearing surface of the carrier module. The limiting grooves are used to carry multiple sections of the metal powder injection molding parts to be welded; the pressing mechanism is connected to the base through the lifting mechanism and includes a pressing cover plate. A limiting protrusion corresponding to the limiting groove is provided on the pressing surface of the pressing cover plate, and a welding opening corresponding to the welding point of the metal powder injection molding part to be welded is provided on the pressing cover plate; when the pressing cover plate is pressed to the bearing surface, the limiting groove and the limiting protrusion form a profiling clamping limit for the metal powder injection molding part to be welded.

[0007] According to an embodiment of the present invention, a replacement opening for removing the carrier module is provided on one side of the carrier table, and a pushing mechanism for pushing the carrier module is provided on the opposite side of the removal side.

[0008] When the welding jig needs to replace the carrier module, the replacement opening provides a simple interface. Combined with the action of the pushing mechanism, the carrier module can be easily removed, effectively improving the working efficiency of the jig, ensuring that during the production process, it can quickly adapt to the welding requirements of different parts and thus replace different carrier modules, improving the flexibility and maintenance efficiency of the jig.

[0009] According to an embodiment of the present invention, clamping mechanisms are provided on the other two opposite sides of the carrier module. The clamping mechanisms are used to further fix the carrier module and prevent the carrier module from moving slightly during the welding process. The clamping mechanism can effectively maintain the stability of the carrier module and ensure that the position accuracy of the parts is not affected during the welding process. At the same time, when the carrier module needs to be replaced, the clamping mechanism can adapt to the size deviation of different carrier modules, provide sufficient clamping force, and the clamping mechanism is loosened during the replacement process, and can also provide additional space to ensure the rapid installation and replacement of the module, further improving the flexibility and adaptability of the jig.

[0010] According to an embodiment of the present invention, a guiding groove is provided on the removal side of the carrier module, and a guiding protrusion cooperating with the guiding groove is provided on the pressing cover plate. The guiding protrusion is used to limit the lateral displacement of the carrier module, ensure that the carrier module maintains an accurate position during the welding process, and prevent it from being laterally removed from the replacement opening. At the same time, the guiding protrusion can also guide the pressing process of the pressing mechanism, ensure the precise alignment of the pressing process, and further improve the pressing accuracy and stability.

[0011] According to an embodiment of the present invention, the carrier table is made of a material with a thermal conductivity of not less than 100 W / (m·K). A temperature control device is provided on the base, and the temperature control device heats or cools the carrier table through thermal contact with the carrier table.

[0012] By preheating the metal powder injection molding parts to be welded before welding, the stress concentration caused by excessive temperature difference is reduced, and the deformation risk generated during the welding process is lowered. At the same time, after welding, the temperature control device effectively reduces the thermal stress by precisely controlling the cooling rate, further preventing unnecessary deformation of the parts and ensuring the dimensional accuracy and stability of the parts after welding.

[0013] According to an embodiment of the present invention, the pressing cover plate includes a lifting plate body, a moving plate body and a moving mechanism. The lifting plate body is connected to the lifting mechanism. The moving plate body is slidably connected to the lifting plate body along the length direction of the strip-shaped limiting groove and slides to a preset position through the moving mechanism. The welding opening is provided on the moving plate body.

[0014] Through the setting of the moving plate body, the pressing accuracy can be finely adjusted, further ensuring the accuracy during the welding process and avoiding damage to the parts caused by small misalignments during pressing after replacing the carrier module. By precisely controlling the position of the moving plate body, the precise docking of the welding opening and the welding point to be welded is ensured, thereby improving the welding quality and the forming accuracy of the parts.

[0015] According to an embodiment of the present invention, the pressing mechanism further includes a guide post. The guide post is erected on the carrier table, and a guide hole matching the guide post is provided on the lifting plate body.

[0016] Through the setting of the guide post and the guide hole, the slight shaking during the descent of the pressing cover plate is effectively avoided, ensuring that the lifting plate body always remains stable during the pressing process and avoiding uneven pressing or position deviation caused by shaking.

[0017] According to an embodiment of the present invention, the moving plate body includes a top layer plate body, a bottom layer plate body and an elastic member. The top layer plate body and the bottom layer plate body are connected by the elastic member. The top layer plate body is slidably connected to the lifting plate body, and a limiting protrusion corresponding to the limiting groove is provided on the pressing surface of the bottom layer plate body.

[0018] The setting of the elastic member connection increases the pressing buffer during the pressing process of the metal powder injection molding part to be welded, avoiding rigid contact between the pressing cover plate and the metal powder injection molding part to be welded when the pressing cover plate drops, thereby reducing the impact force on the metal powder injection molding part to be welded. At the same time, through the control of the elastic force of the elastic member, the clamping force on the metal powder injection molding part to be welded can be precisely adjusted to ensure that the metal powder injection molding part to be welded will not be subjected to excessive pressure or deformation during the pressing process, ensuring the precise clamping force during the welding process and further improving the welding quality and stability.

[0019] According to an embodiment of the present invention, the welding opening is funnel-shaped. The funnel-shaped opening setting enables sufficient operating space during the laser welding process, ensuring that the laser beam can accurately irradiate the welding point of the metal powder injection molding part to be welded, thereby ensuring precise positioning during the welding process. At the same time, the design of the funnel-shaped opening effectively avoids an overly large opening, preventing the laser beam from accidentally irradiating other areas that should not be welded during the welding process, thereby reducing the occurrence of ineffective welding and improving the welding quality and efficiency.

[0020] The embodiment of the present invention also provides a welding method for a metal powder injection molding part, using the welding jig for the specific metal powder injection molding part described in any one of the above to weld multiple strip-shaped metal powder injection molding parts to be welded, including the following steps: S1: Place multiple strip-shaped metal powder injection molding parts to be welded in the strip-shaped limiting grooves of the bearing module in sequence along the length direction to ensure the linear dimension accuracy and straightness of multiple strip-shaped metal powder injection molding parts to be welded; S2: Drive the lifting mechanism to lower the pressing cover plate to the bearing surface, form a profiling clamping limit through the limiting protrusion of the pressing cover plate and the limiting groove, and apply a pressing force to fix all the metal powder injection molding parts to be welded; S3: Weld the welding points corresponding to the welding openings of the pressing cover plate through a laser welding device; S4: After welding is completed, raise the pressing cover plate and take out the welded metal powder injection molding part.

[0021] (III) Beneficial effects of the present invention: The present invention uses an adjustable pressing mechanism and a lifting mechanism to clamp the metal powder injection molding part to be welded by the cooperation of the limiting groove and the limiting protrusion, ensuring the stable positioning of multiple ultra-long size parts during the welding process, and being able to flexibly adapt to the welding requirements of parts of different sizes, providing precise support and stable clamping force, preventing part deformation caused by thermal stress and temperature changes, thereby ensuring the welding quality and dimensional accuracy, ensuring that the flatness and straightness of the welded parts meet the requirements, and effectively improving the welding yield rate of the final parts. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the three-dimensional structure of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the second state of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 3 Schematic diagram of the three-dimensional structure of the bearing table of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the bearing module of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 5 Schematic diagram of the front view structure of the pressing cover plate of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 6 Schematic diagram of the top view structure of the pressing cover plate of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 7 Schematic diagram of the bottom view structure of the pressing cover plate of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 8 Schematic diagram of the sectional view of the three-dimensional structure of the pressing cover plate of the welding jig for metal powder injection molding parts provided by an embodiment of the present invention; Figure 9 Schematic diagram of the three-dimensional structure of the welded metal powder injection molding parts provided by an embodiment of the present invention; Figure 10 Schematic diagram of the three-dimensional structure of the metal powder injection molding parts to be welded provided by an embodiment of the present invention.

[0024] Icons: 1. Base; 11. Support member; 2. Carrying platform; 211. Replacement port; 212. Pushing mechanism; 213. Clamping mechanism; 22. Carrying module; 221. Limiting groove; 222. Guide groove; 3. Pressing mechanism; 31. Lifting mechanism; 32. Pressing cover plate; 321. Limiting protrusion; 322. Welding opening; 323. Guide protrusion; 324. Lifting plate body; 325. Moving plate body; 3251. Top layer plate body; 3252. Bottom layer plate body; 3253. Limiting plate body; 3254. Elastic member; 326. Moving mechanism; 33. Guide post; 4. Temperature control device; 5. Metal powder injection molding part. Detailed implementation manners

[0025] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Specific embodiment: As Figures 1 to 10 shown, this embodiment provides a welding jig for a metal powder injection molding part 5, which is used to solve the multi-segment welding of metal powder injection molding parts 5 with ultra-long dimensions (more than 150 mm), and is composed of a base 1, a carrying platform 2 and a pressing mechanism 3.

[0027] Among them, the base 1 is the main load-bearing part of the welding jig, providing stable support for the entire jig. The base 1 is made of a metal material with relatively high strength, such as cast iron or steel, to ensure the stability and load-bearing capacity of the jig. The configuration of the base 1 includes two main components: a support member 11 and a lifting mechanism 31.

[0028] Support member 11: The support member 11 is vertically arranged on the base 1 and is used to support the carrying platform 2. The support member 11 is usually made of a strong metal material, such as steel or aluminum alloy. Its shape can be a straight line or a U-shaped structure, which is specifically determined according to the weight and stability requirements of the jig design.

[0029] The lifting mechanism 31 is part of the pressing mechanism 3: The lifting mechanism 31 enables the pressing cover plate 32 to be precisely adjusted up and down above the carrying platform 2 through a driving device. The lifting mechanism 31 can adopt driving methods such as electric push rods, pneumatic systems or hydraulic systems to ensure that the height of the carrying platform 2 can be adjusted according to different welding requirements.

[0030] The support member 11 is connected to the base 1, and the connection method usually adopts bolts, welding or slot fixing to ensure that the carrier table 2 does not shake during the welding process, so as to ensure the stable placement of the metal powder injection molding part 5 to be welded. The carrier table 2 is made of a material with high thermal conductivity, and the thermal conductivity is not less than 100 W / (m·K), such as aluminum alloy or copper alloy, to ensure that the heat can be evenly distributed during the welding process and avoid metal deformation caused by local overheating. The surface of the carrier table 2 is flat and has sufficient load-bearing capacity. Such as Figure 1 And Figure 4 As shown, the carrier module 22 is embedded in the carrier table 2. The bearing surface of the carrier module 22 is flush with the bearing surface of the carrier table 2, and strip-shaped limiting grooves 221 are provided on the module surface. The limiting grooves 221 are used to accurately position the multi-segment metal powder injection molding parts 5 to be welded to ensure that their linearity and straightness are not affected. The limiting grooves 221 can be accurately formed by machining or laser cutting.

[0031] The pressing mechanism 3 is connected to the base 1 through the lifting mechanism 31 and is responsible for providing a stable pressing force during the welding process to ensure that the metal powder injection molding part 5 to be welded does not displace or deform. Specifically, it includes a pressing cover plate 32, and the design of the pressing cover plate 32 is the core part of the pressing mechanism 3. Limiting protrusions 321 corresponding to the limiting grooves 221 on the carrier table 2 are provided on the pressing surface of the pressing cover plate 32 for forming clamping and limiting of the metal powder injection molding part 5 to be welded. The pressing cover plate 32 is usually made of high-strength steel or alloy material to ensure its sufficient strength and durability. The welding opening 322 on the pressing cover plate 32 is funnel-shaped and corresponds to the welding point of the metal powder injection molding part 5 to be welded to ensure that the laser or other welding methods can accurately act on the welding point during the welding process. When the pressing cover plate 32 is pressed to the limiting groove 221 on the bearing surface, the limiting groove 221 and the limiting protrusion 321 form a profiling clamping and limiting of the metal powder injection molding part 5 to be welded. This design can ensure that multiple metal powder injection molding parts 5 to be welded always maintain a stable position during the welding process and prevent displacement or deformation caused by temperature changes, thermal stress or other factors. The design of the limiting protrusion 321 ensures that each metal powder injection molding part 5 to be welded can be accurately fixed in the appropriate position to avoid deviation during the welding process.

[0032] Such as Figure 3As shown in the figure, a replacement opening 211 for removing the carrier module 22 is provided on one side of the carrier table 2. The replacement opening 211 is a key component of the carrier table 2, and its function is to provide a convenient interface for replacing the carrier module 22. The position of the replacement opening 211 is usually set on the side of the carrier table 2. The shape and size of the replacement opening 211 are set according to the size of the carrier module 22. Usually, a rectangular or square opening is adopted to ensure that the carrier module 22 can be smoothly removed. On the opposite side of the removal side, a pushing mechanism 212 for pushing the carrier module 22 is provided. The pushing mechanism 212 usually consists of an electric push rod, a pneumatic system or a mechanical lever. Its function is to push the carrier module 22 out of the replacement opening 211 through a uniform thrust. In this embodiment, there are two push rods inserted into the holes on the side wall of the carrier table 2.

[0033] Furthermore, clamping mechanisms 213 are provided on the other two opposite sides of the carrier module 22. The clamping mechanisms 213 are used to further fix the carrier module 22 and prevent slight movement of the carrier module 22 during the welding process. The clamping mechanisms 213 can effectively maintain the stability of the carrier module 22 and ensure that the position accuracy of the parts is not affected during the welding process. At the same time, when the carrier module 22 needs to be replaced, the clamping mechanisms 213 can adapt to the size deviation of different carrier modules 22, provide sufficient clamping force, and the clamping mechanisms 213 are loosened during the replacement process, and can also provide additional space to ensure the rapid installation and replacement of the module, further improving the flexibility and adaptability of the jig.

[0034] As Figure 4 shown in the figure, a guide groove 222 is provided on the removal side of the carrier module 22. The guide groove 222 is usually formed by precision machining or laser cutting, and has a certain width and depth. In this embodiment, it is a square groove. A guide protrusion 323 matching the guide groove 222 is provided on the pressing cover plate 32. The guide protrusion 323 is usually made of steel or other high-strength alloy materials to improve its strength and durability and prevent wear or deformation during long-term use. Its surface may be hardened to further enhance wear resistance and reduce friction. The guide protrusion 323 is used to limit the lateral displacement of the carrier module 22, ensure that the carrier module 22 maintains an accurate position during the welding process, and prevent it from being laterally removed from the replacement opening 211. At the same time, the guide protrusion 323 can also guide the pressing process of the pressing mechanism 3 to ensure the accurate alignment of the pressing process, and further improve the pressing accuracy and stability.

[0035] As Figure 1 and Figure 2As shown, a temperature control device 4 is provided on the base 1. The temperature control device 4 heats or cools the carrier table 2 through thermal contact with the carrier table 2. The temperature control device 4 generally includes a temperature control module, a heating element (such as an electric heating wire or a heat pipe), and a cooling element (such as a Peltier element or a compressor). The temperature control module uses a high-precision temperature control chip or controller to monitor the temperature of the carrier table 2 in real time and adjusts it through a heating or cooling system to maintain the carrier table 2 within a preset temperature range.

[0036] The heating element usually uses high-temperature resistant materials, such as electric heating wires wrapped with titanium alloy or stainless steel, which can quickly and evenly heat the carrier table 2 to ensure that the metal powder injection molding part 5 obtains uniform preheating before welding and reduces stress concentration caused by temperature difference. The cooling element can use a Peltier element or a compressor, etc. Through the principle of heat exchange, it can quickly reduce the temperature of the carrier table 2 to ensure that the metal powder injection molding part 5 after welding can cool at a suitable temperature and avoid deformation caused by thermal stress.

[0037] The thermal contact part of the temperature control device 4 is connected to the carrier table 2 through a metal heat conduction plate, a copper pipe or an aluminum alloy plate to ensure that heat can be efficiently transferred to the carrier table 2. The selection of the heat conduction material needs to consider its good heat conduction performance and high stability to ensure that the temperature control system can work efficiently and continuously provide stable temperature control. The surface of the heat conduction plate can be coated to enhance its corrosion resistance and extend its service life.

[0038] As Figures 5 to 8 shown, the pressing cover plate 32 includes a lifting plate body 324, a moving plate body 325 and a moving mechanism 326; The lifting plate body 324 is connected to the lifting mechanism 31. The lifting mechanism 31 can accurately adjust the height of the lifting plate body 324 through electric drive, a pneumatic system or a hydraulic system. The lifting plate body 324 is usually designed with high-strength alloy steel or aluminum alloy to ensure its sufficient strength and durability, and its surface can be treated with wear resistance to extend its service life. The lifting plate body 324 realizes accurate up and down movement through the lifting mechanism 31 to ensure that the pressing cover plate 32 can apply uniform pressure to the metal powder injection molding part 5 to be welded during the pressing process.

[0039] The welding opening 322 is provided on the movable plate. The movable plate and the lifting plate body 324 are slidably connected along the length direction of the strip-shaped limiting groove 221. The movable plate body 325 is usually made of a light but strong enough material (such as aluminum alloy or stainless steel), and its design ensures that the movable plate body 325 can slide smoothly and stably during the pressing process. The sliding mode of the movable plate body 325 can be realized through a track, a chute or a roller system. In this embodiment, the movable plate body 325 is embedded in the middle opening of the lifting plate body 324, is linked with the lifting plate body 324 through the chutes on both sides, and slides to a preset position through the moving mechanism 326. The moving mechanism 326 usually adopts an electric push rod, a servo motor or a pneumatic driving system, and can provide precise movement control.

[0040] As Figures 1 to 3 shown, the pressing mechanism 3 further includes a guide post 33. The guide post 33 is erected on the bearing table 2. The lifting plate body 324 is provided with a guide hole matching the guide post 33. The function of the guide post 33 is to ensure that the lifting plate body 324 always maintains a stable vertical movement track during the pressing process, and to avoid inaccurate welding caused by slight shaking or uneven movement of the pressing cover plate 32.

[0041] Through the arrangement of the guide post 33 and the guide hole, the slight shaking during the descending process of the pressing cover plate 32 is effectively avoided, ensuring that the lifting plate body 324 always remains stable during the pressing process, and avoiding uneven pressing or position deviation caused by shaking. The guide post 33 is usually designed as a cylindrical or square column shape, and the diameter or width size matches the guide hole on the lifting plate body 324 to ensure very precise cooperation between the two. The bottom of the guide post 33 is fixed to the bearing table 2 by bolts or other fixing methods, and the top is precisely docked with the guide hole of the lifting plate body 324.

[0042] As Figure 8 shown, the movable plate body 325 includes a top layer plate body 3251, a bottom layer plate body 3252 and an elastic member 3254. The top layer plate body 3251 and the bottom layer plate body 3252 are connected by the elastic member 3254. The elastic member 3254 is a spring or a rubber pad. In this embodiment, it is a spring. Its function is to provide certain elastic support for the entire movable plate body 325. The material selection of the elastic member 3254 is crucial for its performance. Usually, high-elasticity and high-temperature-resistant materials (such as wire springs or high-temperature-resistant rubbers) are used to ensure its stability and durability during long-term use. The top layer plate body 3251 is slidably connected with the lifting plate body 324. The pressing surface of the bottom layer plate body 3252 is provided with a limiting protrusion 321 corresponding to the limiting groove 221. The top layer plate body 3251 is also fixedly connected with a limiting plate body 3253 extending vertically downward. The limiting plate body 3253 is used to limit the movement track of the bottom layer plate body 3252 and avoid its shaking and position deviation.

[0043] This embodiment also provides a welding method for a high-precision metal powder injection molding part 5, which uses the welding jig for the metal powder injection molding part 5 described above, and can effectively avoid part deformation caused by temperature changes, thermal stress, etc. during the welding process. This method is mainly used to solve the multi-section welding problem of metal powder injection molding parts 5 with ultra-long dimensions (more than 150 mm), ensure that the dimensional accuracy, flatness and straightness of the parts after welding meet the requirements, and significantly improve the welding yield rate of the final parts.

[0044] Step S1: Place the metal powder injection molding part 5 First, place the multi-section metal powder injection molding parts 5 to be welded in the strip-shaped limiting grooves 221 of the bearing module 22 in sequence along the length direction. This step ensures the linear dimensional accuracy and straightness of the metal powder injection molding parts 5 to be welded during the welding process. The design of the limiting grooves 221 ensures that each part can be stably placed, preventing deformation or error caused by position deviation or uneven clamping force during the welding process.

[0045] Step S2: Lowering and clamping of the pressing cover plate 32 Next, drive the lifting mechanism 31 to lower the pressing cover plate 32 to the bearing surface, and form precise clamping through the limiting protrusions 321 on the pressing cover plate 32 and the limiting grooves 221 on the bearing table 2. This clamping process, through the cooperation of the limiting grooves 221 and the limiting protrusions 321, stably clamps the multiple metal powder injection molding parts 5 to be welded in place and applies an appropriate pressing force to ensure that all the metal powder injection molding parts 5 to be welded will not displace or deform during the welding process.

[0046] Step S3: Laser welding During the welding process, use a laser welding device to precisely weld the welding points corresponding to the welding openings 322 on the pressing cover plate 32. The welding openings 322 are funnel-shaped, ensuring that the laser beam can accurately irradiate the welding points of the metal powder injection molding parts 5 to be welded, thus ensuring precise positioning and efficient welding during the welding process. The design of the funnel-shaped openings prevents the laser beam from mis-irradiating other areas that should not be welded, reduces the occurrence of ineffective welding, and improves the quality and efficiency of welding.

[0047] Step S4: Removal after welding After welding is completed, lift the pressing cover plate 32 to take out the welded metal powder injection molding part 5. At this time, the stability of the bearing module 22 is effectively guaranteed, and the welded metal powder injection molding part 5 maintains its shape and accuracy, without worrying about deformation caused by excessive or uneven pressing.

[0048] Temperature control process (optional step): During the entire welding process, the temperature control device 4 on the base 1 can also be used to heat or cool the carrier table 2 to ensure precise temperature control. The temperature control device 4 can preheat the metal powder injection molding part 5 before welding, reduce stress concentration caused by excessive temperature difference, and reduce the risk of deformation that may occur during welding. At the same time, after welding, the cooling rate is precisely adjusted through the temperature control device 4 to further reduce thermal stress, prevent unnecessary deformation of the parts, and ensure the dimensional accuracy and stability of the welded parts.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A welding jig for metal powder injection molded parts, characterized in that: include: A base, configured with a support member and a lifting mechanism; A bearing platform, connected to the base through the support member, a bearing module is embedded in the bearing platform, a bearing surface of the bearing module is flush with the bearing surface of the bearing platform, and a strip-shaped limiting groove is provided on the bearing surface of the bearing module, and the limiting groove is used to carry multiple sections of the metal powder injection molded parts to be welded; A pressing mechanism, connected to the base through the lifting mechanism, comprises a pressing cover plate, a pressing surface of the pressing cover plate is provided with a limiting protrusion corresponding to the limiting groove, and the pressing cover plate is provided with a welding opening corresponding to a welding point of the metal powder injection molded part to be welded; When the pressing cover plate is pressed onto the bearing surface, the limiting groove and the limiting protrusion form a contoured clamping limit for the metal powder injection molded part to be welded.

2. The welding jig for metal powder injection molded parts according to claim 1, characterized in that: A replacement port for removing the carrying module is provided on one side of the carrying platform, and a pushing mechanism for pushing the carrying module is provided on the opposite side of the removal side.

3. The welding jig for metal powder injection molded parts according to claim 2, characterized in that: The other two opposite sides of the carrier module are provided with clamping mechanisms.

4. The welding jig for metal powder injection molded parts according to claim 2, characterized in that: A guide groove is provided on the removal side of the carrier module, and a guide protrusion cooperating with the guide groove is provided on the pressing cover plate. The guide protrusion is used to limit the lateral displacement of the carrier module and guide the pressing of the pressing mechanism.

5. The welding jig for metal powder injection molded parts according to claim 1, characterized in that: The carrier platform is made of a material with a thermal conductivity of not less than 100 W / (m·K), and a temperature control device is provided on the base. The temperature control device heats or cools the carrier platform through thermal contact with the carrier platform.

6. The welding jig for metal powder injection molded parts according to claim 1, characterized in that: The pressed cover plate includes a lifting plate body, a movable plate body and a movable mechanism. The lifting plate body is connected to the lifting mechanism. The movable plate body is slidably connected to the lifting plate body along the length direction of the strip-shaped limiting groove and slides to a preset position through the movable mechanism. The welding opening is provided on the movable plate body.

7. The welding jig for metal powder injection molded parts according to claim 6, characterized in that: The pressing mechanism further comprises a guide column, which is vertically arranged on the bearing platform, and a guide hole matching the guide column is arranged on the lifting plate body.

8. The welding jig for metal powder injection molded parts according to claim 6, characterized in that: The movable plate body includes a top plate body, a bottom plate body and an elastic member. The top plate body and the bottom plate body are connected by the elastic member. The top plate body is slidably connected to the lifting plate body. The pressing surface of the bottom plate body is provided with a limiting protrusion corresponding to the limiting groove.

9. The welding jig for metal powder injection molded parts according to any one of claims 1 to 8, characterized in that: The welding opening is funnel-shaped.

10. A method for welding metal powder injection molded parts, characterized in that: Using the specific metal powder injection molded part welding fixture described in any one of claims 1 to 9 to weld multiple sections of strip-shaped metal powder injection molded parts to be welded, comprises the following steps: S1: placing multiple sections of metal powder injection molded parts to be welded in the strip-shaped limiting grooves of the carrier module in sequence along the length direction to ensure the linear dimensional accuracy and straightness of the multiple sections of metal powder injection molded parts to be welded; S2: driving the lifting mechanism to lower the pressed cover plate to the bearing surface, forming a contoured clamping limit through the limiting protrusion of the pressed cover plate and the limiting groove, and applying a pressing force to fix all the metal powder injection molded parts to be welded; S3: welding the welding points corresponding to the welding openings of the pressed cover plate by means of laser welding equipment; S4: After the welding is completed, the pressed cover plate is lifted and the welded metal powder injection molded part is taken out.

Images