Thin-wall product and production process and auxiliary production device thereof

Abstract

The invention relates to the technical field of metal powder injection molding, in particular to a thin-wall product and a production process and auxiliary production device.The thin-wall product is a metal part, a row of penetrating holes are formed in the metal part, and the production process of the thin-wall product comprises the steps of insert pressing and supporting, film coating treatment, insert injection, degreasing, sintering, insert disassembling and aftertreatment. An auxiliary production device of the production process is used for clamping and transferring the supporting insert or a composite body of the supporting insert and the MIM green body. According to the injection molding technology, the ceramic supporting insert is combined with the MIM technology, and the problems that no ejector pin space exists during injection molding of a thin-wall product, deformation is prone to occurring in the catalytic degreasing and high-temperature sintering process, demolding is difficult and the like are solved; the rigid, heat-resistant and stable-shape ceramic supporting insert is used for physically supporting and limiting the thin-wall product all the time, and deformation of all stages, especially the sintering stage with the maximum shrinkage rate is greatly restrained.

Description

Technical Field

[0001] This application relates to the field of metal powder injection molding technology, and in particular to a thin-walled product and its manufacturing process and auxiliary production equipment. Background Technology

[0002] Metal powder injection molding (MIM) technology is widely used in manufacturing small metal parts with complex structures and high precision requirements. However, when manufacturing products with thin walls (usually less than 0.40 mm), the small size makes it difficult to set up basic structures such as ejection and draft in the mold, resulting in the product being unable to be directly molded. In addition, during the sintering stage of the MIM process, thin-walled products are prone to uncontrollable deformation, which seriously affects the dimensional accuracy and consistency of the product.

[0003] In existing technologies, inserts are generally used within the mold to assist in molding. However, conventional inserts still suffer from problems such as difficulty in ejection during demolding and sintering, easy adhesion to the product, and inaccurate deformation control. Furthermore, due to the small size of metal parts, they are typically produced in a one-to-many manner within the mold, usually arranged in two or more rows, with each row accommodating multiple products, thus requiring a large number of inserts. The traditional method of installing inserts involves workers manually installing each insert onto the mold, which requires machine downtime, impacting production efficiency. Moreover, manual operation cannot guarantee that each insert will be installed correctly, resulting in inconsistent installation. On the other hand, after injection molding, the composite of the thin-walled product and the insert needs to be removed and placed on a tray. Existing technologies typically involve manual material handling and tray placement, which is time-consuming, labor-intensive, and inefficient. There is a lack of versatile auxiliary production devices to assist in clamping and transferring the support inserts or the composite of the support inserts and the MIM preform.

[0004] Based on this, those skilled in the art have proposed an auxiliary production device for thin-walled products, which provides a new solution to the above-mentioned technical problems. Summary of the Invention

[0005] To address the problems mentioned in the background art, this application provides a thin-walled product, its manufacturing process, and auxiliary manufacturing apparatus.

[0006] The technical solution adopted in this application for a thin-walled product, its manufacturing process, and auxiliary production equipment is as follows: A thin-walled product, wherein the thin-walled product is a metal part with a wall thickness of 0.15-0.40 mm at all points, and the metal part has a row of perforations, wherein the number of perforations is at least two.

[0007] A manufacturing process for a thin-walled product includes the following steps: Step 1: Pressing the support insert, using ceramic material to press and form a support insert with rigidity, acid resistance and heat resistance; Step 2: Coating treatment, covering the MIM production area of ​​the support insert with a plastic coating, the plastic coating being made of a material that can be degraded in the MIM catalytic degreasing process; Step 3: Insert injection. The coated support insert is placed into the mold, filled with metal powder for MIM injection molding, forming a MIM preform, and a composite of the support insert and the MIM preform is obtained. The composite is then placed on a tray. Step 4: Degreasing. Catalytic degreasing is performed on the composite to decompose and remove the binders in the plastic coating and MIM preform. Step 5: Sintering. The degreased components are sintered to shrink the MIM green blank into the target thin-walled product. During the sintering process, the support insert limits the deformation of the thin-walled product. Step Six: Removal of Inlays and Post-processing. The support inlays are separated from the sintered thin-walled product, and the surface of the separated thin-walled product is finished to obtain the finished product. By adopting the above technical solution, combining ceramic support inserts with MIM technology, the problems of thin-walled products being prone to deformation and difficult demolding during injection molding due to lack of ejector pin space, catalytic debinding, and high-temperature sintering are solved. Covering the rigid ceramic inserts with a biodegradable plastic coating has three functions: first, it acts as an isolation layer during injection molding to prevent the metal preform from sticking to the insert; second, it degrades and removes the binder in the preform simultaneously during the catalytic debinding stage, reserving space for subsequent product shrinkage; and third, its thickness design can accurately compensate for sintering shrinkage, ensuring the final dimensional accuracy. The efficient and non-destructive separation of the support insert and the finished product is achieved through catalytic degreasing in step S4 to remove the plastic coating and physical separation in step six. The ceramic material ensures that the insert remains intact after degreasing and sintering, making it reusable and reducing production costs. Throughout the entire process from injection molding to sintering and cooling, the rigid, heat-resistant, and shape-stable ceramic support insert provides physical support and restraint for the thin-walled product, greatly suppressing deformation at each stage, especially during the sintering stage with the largest shrinkage rate, thereby obtaining ultra-thin-walled products with high dimensional accuracy and consistency.

[0008] Optionally, the material of the support insert in step one is alumina ceramic. The rigidity of the support insert meets the requirements of the ejector pin arrangement and structural support, the acid resistance meets the requirement of no decomposition in the degreasing process, and the heat resistance meets the requirement of no decomposition and no deformation in the sintering process. By adopting the above technical solution and using alumina ceramic as the insert material, its high rigidity, excellent acid resistance and high temperature stability meet the stringent requirements of the MIM process for the support to withstand pressure during injection, acidic catalytic environment during degreasing and high temperature during sintering, ensuring the reliability of the process and the durability of the insert. Through the design of the support insert, the ejection function that cannot be achieved in traditional molds is replaced, and it directly participates in product molding and protection.

[0009] Optionally, the material of the plastic coating in step two is POM material, and the thickness of the plastic coating is 1.05-1.25 times the dimensional shrinkage rate of the MIM preform from injection molding to sintering; By adopting the above technical solution and using POM (polyoxymethylene) as the coating material, it is possible to ensure that the coating can be degraded synchronously and completely with the green body binder in the MIM catalytic debinding process. The coating thickness is limited to 1.05-1.25 times the shrinkage rate of the MIM green body. This ensures that the coating has sufficient thickness to effectively isolate the insert from the green body before debinding, and the thickness, which is slightly greater than the shrinkage rate, provides a precise buffer space for the sintering shrinkage of the product, preventing cracking or deformation caused by obstructed shrinkage.

[0010] An auxiliary production apparatus for a thin-walled product manufacturing process, the auxiliary production apparatus being used to clamp and transfer the support insert or a composite of the support insert and the MIM green preform; By adopting the above technical solution and setting up auxiliary production devices specifically for clamping and transferring support inserts or their composites with green blanks, the automated and mechanized flow of key materials on the production line is realized, replacing inefficient and error-prone manual operations. This significantly improves production efficiency and the consistency of insert installation. Precise clamping and transfer via mechanical devices avoids problems such as improper placement of inserts and deformation of composites during handling that may occur with manual operations, ensuring the consistency of production conditions for each product and thus guaranteeing the stability of batch product quality.

[0011] Optionally, it includes a mounting frame and a first mounting plate fixed to the bottom of the mounting frame. The first mounting plate has release grooves on both sides. A clamping mechanism is installed at the bottom of the first mounting plate and at both ends of the release groove. A batch clamping assembly is provided on both sides of the release groove. A separation mechanism is provided between the mounting frame and the first mounting plate. By adopting the above technical solution, a multifunctional integrated platform is constructed through the combination of mounting frame, first mounting plate, release groove, clamping mechanism, batch clamping component and separation mechanism, which can simultaneously or sequentially complete operations such as clamping, batch processing and orderly placement of inserts or composites.

[0012] Optionally, the clamping mechanism includes a first guide rail installed at the end of the release groove and arranged at four opposite angles, wherein a first displacement block is slidably connected on the first guide rail near the end edge of the first mounting plate in the length direction, and a second displacement block is slidably connected on the first guide rail away from the end edge of the first mounting plate in the length direction. A clamping block is fixed at the end of the first displacement block and the second displacement block located on the same side that are close to each other, wherein a first guide rod is inserted through and slidably connected to the inner side of the four first displacement blocks located on the same end; Two of the four second displacement blocks located at the same end are connected to each other by a second guide rod through their inner sides and are slidably connected to each other. Two of the second displacement blocks are connected to each other by a third guide rod through their inner sides and are slidably connected to each other. A transmission rack is fixedly connected to the first guide rod, the second guide rod and the third guide rod. A transmission gear is meshed with one side of the transmission rack, and a transmission rack is meshed with the other side of the transmission gear away from the transmission rack. The transmission rack is fixedly connected to the first guide rod. A support slide rod is fixedly connected to the bottom of both the transmission rack and the transmission rack. A limiting slide groove adapted to the support slide rod is opened on the first mounting plate. The support slide rod is slidably connected in the corresponding limiting slide groove. A drive cylinder is mounted on the upper end of the first mounting plate, and the output end of the drive cylinder is fixedly connected to the first guide rod at the same end. By adopting the above technical solution, a multi-directional clamping block design is used, in which the driving cylinder is linked by a gear and rack mechanism. One driving cylinder can simultaneously control multiple clamping blocks to move along the inclined guide rail, so as to realize synchronous contraction or opening from the center outward or from the outside inward. The clamping centering accuracy is high. The guide rod, support slide rod and limit slide groove form a multi-guide system to ensure that the clamping action is smooth, accurate and without jamming.

[0013] Optionally, a sliding connection groove is provided on the top of the first displacement block or the second displacement block. A buffer block is slidably connected to the inside of the sliding connection groove. A first spring is provided at one end of the buffer block. The two ends of the first spring are respectively connected to the buffer block and the side wall of the sliding connection groove. A slider is fixedly installed on the top of the buffer block. The slider is slidably connected to the corresponding first guide rail. By adopting the above technical solution, a spring buffer block is set between the first displacement block or the second displacement block and the guide rail to provide flexible contact and buffer when clamping brittle inserts such as ceramics, so as to prevent rigid impact from causing damage or breakage to the inserts or fragile green body composites.

[0014] Optionally, the batch clamping assembly includes a plurality of second guide rails fixed to the first mounting plate and located on both sides of the release groove. A displacement plate is slidably connected to the plurality of second guide rails on the same side. A clamping plate is provided on the side of the displacement plate near the release groove. A plurality of support guide rods are fixed on the side of the clamping plate near the displacement plate. The support guide rods pass through and are slidably connected to the displacement plate on the same side. A second spring is sleeved on the outside of the support guide rod. The two ends of the second spring are respectively connected to the support guide rod and the displacement plate. The displacement plate has drive slots at both ends, and the second displacement block has a drive block that matches the drive slot at one end near the displacement plate. The second displacement block is slidably connected to the displacement plate through the cooperation of the drive block and the drive slot. The drive groove is inclined, and its inclination angle is smaller than that of the first guide rail, so that when the second displacement block slides along the first guide rail, the displacement plate can be driven to slide along the second guide rail through the cooperation of the drive groove and the drive block. By adopting the above technical solution, the batch clamping assembly is linked with the second displacement block of the clamping mechanism through the inclined drive groove. When the clamping mechanism is activated, it can automatically drive the clamping plates on both sides to move closer or further away synchronously, so as to clamp or release multiple inserts or composites in a row at one time. This greatly improves the loading and unloading efficiency when multiple rows of molds are produced at once. The clamping plates are connected to the displacement plate through springs to form a floating clamping mechanism, which can adapt to multiple workpieces with slight size differences or positional deviations, ensuring that each workpiece is reliably and appropriately clamped, avoiding damage from overpressure.

[0015] Optionally, the separating mechanism includes a lifting cylinder fixed to the top of the mounting frame. The output end of the lifting cylinder passes through the mounting frame and is fixed with a second mounting plate. Separating components are provided on both sides of the bottom of the second mounting plate and inside the release groove. The separating components consist of several separating frames. Each separating frame has a connecting strip and a matching connecting groove at both ends. Two adjacent separating frames are connected by the connecting strip and the matching connecting groove. First separating plates are provided at both ends of the bottom of the separating frame. Several second separating plates are provided between the first separating plates at both ends. The several second separating plates divide the space between two first separating plates into a receiving space with the same number of perforations. The thickness of the second separating plates is the same as the wall thickness of the thin-walled product. The thickness of the first separating plates is half the distance between the two sets of support inserts required for the two thin-walled products on the mold. A third separating plate is provided at the bottom of the first separating plates at both ends of the separating frame, away from each other. The thickness of the third separating plate is the difference in thickness between the first separating plate and the second separating plate. By adopting the above technical solution, the separating mechanism can separate each composite into an independent receiving space when the clamping device transfers a row of composites to the tray. This allows for the orderly separation and placement of green composites before sintering, avoiding deformation or adhesion caused by mutual contact and collision during subsequent handling and in the sintering furnace. By specifying that the thickness of the second separating plate is equal to the product wall thickness and the thickness of the first separating plate is related to the product arrangement spacing in the mold, the separating action is ensured to match the product and mold layout, and the separating position is accurate, effectively separating while saving tray space.

[0016] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention combines ceramic support inserts with MIM technology, solving problems such as lack of ejector space during injection molding, easy deformation during catalytic debinding and high-temperature sintering, and difficulty in demolding of thin-walled products. A biodegradable plastic coating is applied to the rigid ceramic insert, serving three purposes: first, it acts as an isolation layer during injection molding to prevent the metal preform from adhering to the insert; second, it degrades and removes the binder in the preform simultaneously during the catalytic debinding stage, reserving space for subsequent product shrinkage; and third, its thickness design precisely compensates for sintering shrinkage, ensuring final dimensional accuracy. Throughout the entire process from injection molding to sintering and cooling, the rigid, heat-resistant, and shape-stable ceramic support insert provides physical support and constraint for the thin-walled product, greatly suppressing deformation at each stage, especially during the sintering stage with the highest shrinkage rate, thereby obtaining ultra-thin-walled products with high dimensional accuracy and consistency.

[0017] 2. This invention, by setting up an auxiliary production device specifically for clamping and transferring support inserts or their composites with green blanks, realizes the automated and mechanized flow of key materials on the production line, replacing inefficient and error-prone manual operations. This significantly improves production efficiency and the consistency of insert installation. Precise clamping and transfer via mechanical devices avoids problems such as improper placement of inserts and deformation of composites during handling that may occur with manual operations, ensuring the consistency of production conditions for each product and thus guaranteeing the stability of batch product quality. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a thin-walled metal component and an insert.

[0019] Figure 2 This is a front view structural diagram of the separation mechanism in an embodiment of this application when it is raised.

[0020] Figure 3 This is a front view structural diagram of the partition mechanism in an embodiment of this application when it is lowered.

[0021] Figure 4 This is a bottom view of the structure of an embodiment of this application.

[0022] Figure 5 This is a three-dimensional structural schematic diagram of an embodiment of this application.

[0023] Figure 6 This is a three-dimensional structural diagram of the clamping mechanism in the embodiments of this application. Figure 1 .

[0024] Figure 7 This is a bottom view of the clamping mechanism in an embodiment of this application.

[0025] Figure 8This is a three-dimensional structural diagram of the clamping mechanism in the embodiments of this application. Figure 2 .

[0026] Figure 9 This is a schematic diagram of the slider, first guide rail, and first spring in an embodiment of this application.

[0027] Figure 10 This is a schematic diagram of the structure of the batch clamping component in an embodiment of this application.

[0028] Figure 11 This is a schematic diagram of the separation mechanism of the present invention.

[0029] Figure 12 This is a schematic diagram of the structure of the partition frame according to an embodiment of this application.

[0030] Figure 13 This is a structural schematic diagram of the partition frame separating the support insert in an embodiment of this application.

[0031] Figure 14 This is a schematic diagram of the structure of the separator frame separating thin-walled products according to an embodiment of this application.

[0032] Figure 15 This is a structural schematic diagram of the thin-walled product, support insert, and mold according to an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures: 1. Thin-walled product; 2. Support insert; 3. Mounting bracket; 4. First mounting plate; 5. Clamping mechanism; 6. Separating mechanism; 7. Lifting cylinder; 8. Second mounting plate; 9. Guide column; 10. Separating bracket; 11. First separating plate; 12. Second separating plate; 13. Third separating plate; 14. Connecting strip; 15. Connecting slot; 16. Drive cylinder; 17. First displacement block; 18. Second displacement block; 19. Clamping block; 20. First guide rod; 21. Second guide rod 22. Third guide rod; 23. Transmission rack one; 24. Transmission rack two; 25. Transmission gear; 26. Release groove; 27. First guide rail; 28. Slider; 29. ​​Sliding connection groove; 30. Buffer block; 31. First spring; 32. Support slide rod; 33. Second guide rail; 34. Displacement plate; 35. Clamping plate; 36. Support guide rod; 37. Second spring; 38. Clamping assembly; 39. Drive groove; 40. Drive block; 41. Accommodation space; 42. Mold. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1-15 The present invention will now be described in further detail.

[0035] Reference Figure 1A thin-walled product, wherein the thin-walled product 1 is a metal part with a wall thickness of 0.15-0.40 mm throughout, and the metal part has a row of perforations, with at least two perforations.

[0036] A manufacturing process for a thin-walled product includes the following steps: S1: Press-down support insert 2 Based on the perforation design of the thin-walled product 1 and the complementary shape of the insert model that can be embedded in the perforation cavity to provide support, alumina ceramic powder is used to press a support insert 2 with high dimensional accuracy and surface finish through dry pressing or isostatic pressing processes. This alumina ceramic support insert 2 must meet the following requirements: Rigidity: Sufficient to withstand the injection pressure during MIM injection without breaking, and can replace ejector pin structures in molds.

[0037] Acid resistance: It can remain stable in catalytic degreasing environments without undergoing chemical reactions or corrosion.

[0038] Heat resistance: It can withstand the high temperatures of the subsequent sintering stage without undergoing phase transformation, softening or deformation at this temperature.

[0039] S2: Coating treatment The pressed alumina ceramic support insert 2 is dipped or sprayed with a layer of polyoxymethylene (POM) plastic solution. The coating process is controlled so that the dried POM coating is evenly adhered to the surface of the support insert 2, especially in the MIM production area that comes into contact with subsequent metal powder. The plastic coating is made of a material that can be degraded in the MIM catalytic degreasing process.

[0040] S3: Insert Injection A ceramic support insert 2 coated with POM is used as an insert, and is precisely positioned and placed into the cavity of the MIM injection molding mold 42. After the mold is closed, metal powder mixed with binder, usually also mainly POM, is injected into the mold. The molten metal encapsulates the coated support insert 2. After cooling, a MIM green body composite including the support insert 2 is formed. Then, the mold is opened and the composite is taken out and placed in an orderly manner on the sintering tray. S4: Catalytic Degreasing The composite material arranged on the tray is sent into a catalytic degreasing furnace. At a temperature of about 120°C, nitric acid vapor is introduced as a catalyst. Under this environment, the POM binder in the green composite material and the POM coating on the surface of the support insert 2 undergo acid degradation and decompose into formaldehyde gas, which is then discharged. After this step, there is no longer any plastic connection between the metal powder particles and between the metal green body and the support insert 2. The shape is maintained only by the mechanical interlocking between the powder particles and the physical support of the support insert 2, forming a brown blank. S5: Sintering The degreased brown blank is fed into a high-temperature sintering furnace, such as a vacuum sintering furnace, and sintered under a protective atmosphere according to a preset sintering curve. The metal powder particles diffuse, fuse, and densify at high temperature and undergo isotropic shrinkage. During this process, the rigid alumina support insert 2 acts as an undeformable skeleton, which provides all-round mechanical restraint to the shrinking metal thin wall, forcing it to shrink along the shape of the support insert 2, thereby effectively suppressing deformations such as warping and twisting.

[0041] The degreased components are sintered to shrink the MIM green blank into the target thin-walled product, and the support insert 2 limits the deformation of the thin-walled product 1 during the sintering process. S6: Removal of Inlays and Post-Processing After sintering, once the components have cooled to room temperature, due to the difference in thermal expansion coefficients between ceramics and metals, and the gaps left after degreasing, the alumina ceramic support insert 2 can be easily removed or separated from the sintered thin-walled metal product. The removed support insert 2 can be reused after cleaning. The separated thin-walled metal product can undergo necessary post-processing, such as passivation, polishing, laser marking, or dimensional fine-tuning, to finally obtain a high-precision finished product.

[0042] In step 2, the plastic coating material is POM material, and the thickness of the plastic coating is 1.05-1.25 times the dimensional shrinkage rate of the MIM preform from injection molding to sintering.

[0043] refer to Figure 1-15 An auxiliary production device for a thin-walled product manufacturing process, the auxiliary production device being used to clamp and transfer the support insert 2 or a composite of the support insert 2 and the MIM green preform; The device includes a mounting frame 3, with a horizontal first mounting plate 4 fixed to its bottom. The first mounting plate 4 has release grooves 26 on both sides of its upper middle section. Clamping mechanisms 5 are installed at the bottom of the first mounting plate 4 and at both ends of the release grooves 26 for clamping single or group inserts or composites. Batch clamping components 38 are provided on both sides of the release grooves 26 for simultaneously clamping multiple support inserts 2 or composites in a row. A separation mechanism 6 is provided between the mounting frame 3 and the first mounting plate 4. refer to Figure 4-9 The clamping mechanism 5 includes four first guide rails 27 symmetrically distributed in a figure-eight shape installed at each end of the release groove 26. First displacement blocks 17 and second displacement blocks 18 are respectively installed on the guide rails. Clamping blocks 19 are fixed at the ends of the first displacement blocks 17 and the second displacement blocks 18 that are close to each other. First guide rods 20 are slidably connected through the four first displacement blocks 17 located at the same end.

[0044] Two of the four second displacement blocks 18 located at the same end are connected to each other by a second guide rod 21 through their inner sides. The two second displacement blocks 18 located away from each other are connected to each other by a third guide rod 22 through their inner sides. A transmission rack 23 is fixedly connected to the first guide rod 20, the second guide rod 21 and the third guide rod 22. A transmission gear 25 is meshed with one side of the transmission rack 23. A transmission rack 24 is meshed with the side of the transmission gear 25 away from the transmission rack 23. The transmission rack 24 is fixedly connected to the first guide rod 20. A support slide rod 32 is fixedly fixed to the bottom of both the transmission rack 23 and the transmission rack 24. A limiting slide groove adapted to the support slide rod 32 is opened on the first mounting plate 4. The support slide rod 32 is slidably connected in the corresponding limiting slide groove. The support slide rod 32 supports the transmission rack 23 and the transmission rack 24, making their movement more stable.

[0045] A drive cylinder 16 is mounted on the upper end of the first mounting plate 4, and the output end of the drive cylinder 16 is fixedly connected to the first guide rod 20 at the same end.

[0046] In use, when the drive cylinder 16 starts and pushes the first guide rod 20, the transmission rack 23 fixed on the rod moves, driving the transmission gear 25 to rotate, which in turn drives the transmission rack 24 meshing with it to move in the opposite direction, thereby driving the second guide rod 21 and the third guide rod 22 to move in the opposite direction. Through this gear and rack synchronization mechanism, the four clamping blocks 19 can be precisely controlled to clamp or release in opposite directions in a synchronized manner.

[0047] The top of either the first displacement block 17 or the second displacement block 18 is provided with a sliding connection groove 29. A buffer block 30 is slidably connected to the inside of the sliding connection groove 29. A first spring 31 is provided at one end of the buffer block 30. The two ends of the first spring 31 are respectively connected to the side wall of the buffer block 30 and the sliding connection groove 29. A slider 28 is fixedly installed on the top of the buffer block 30. The slider 28 is slidably connected to the corresponding first guide rail 27. The first displacement block 17 or the second displacement block 18 is connected to the first guide rail 27 through the slider 28. The bottom of the slider 28 is connected to the buffer block 30 through the first spring 31. When the clamping block 19 contacts the end of the support insert 2 or the thin-walled product 1, the first spring 31 can provide cushioning to prevent hard impact from damaging the fragile ceramic insert or the thin-walled product.

[0048] refer to Figure 10The batch clamping assembly 38 includes a plurality of second guide rails 33 fixed to the first mounting plate 4 and located on both sides of the release groove 26. A displacement plate 34 is slidably connected to the plurality of second guide rails 33 on the same side. A clamping plate 35 is provided on the side of the displacement plate 34 near the release groove 26. A plurality of support guide rods 36 are fixed on the side of the clamping plate 35 near the displacement plate 34. The support guide rods 36 pass through and are slidably connected to the displacement plate 34 on the same side. A second spring 37 is sleeved on the outside of the support guide rod 36. The two ends of the second spring 37 are respectively connected to the support guide rod 36 and the displacement plate 34.

[0049] The drive groove 39 is inclined, and its inclination angle is less than that of the first guide rail 27, so that when the second displacement block 18 slides along the first guide rail 27, the displacement plate 34 can be driven to slide along the second guide rail 33 through the cooperation of the drive groove 39 and the drive block 40.

[0050] The displacement plate 34 has drive grooves 39 at both ends. The second displacement block 18 has a drive block 40 that matches the drive groove 39 at one end near the displacement plate 34. The second displacement block 18 is slidably connected to the displacement plate 34 through the cooperation of the drive block 40 and the drive groove 39. The drive block 40 is fixed on the second displacement block 18 and is inserted into the inclined drive groove 39 at the end of the displacement plate 34. When the second displacement block 18 moves along the inclined first guide rail 27 under the drive of the drive cylinder 16, it has both horizontal and vertical component movements. The drive block 40 slides in the inclined drive groove 39. Since the inclination angle of the drive groove 39 is smaller than that of the first guide rail 27, this movement is converted into driving the displacement plate 34 to make a horizontal linear movement along the second guide rail 33, thereby driving the clamping plates 35 on both sides to clamp or loosen the sides of a row of support inserts 2 simultaneously. The second spring 37 ensures that the clamping force is gentle and adapts to different dimensional tolerances.

[0051] refer to Figure 11-15The separating mechanism 6 includes a lifting cylinder 7 fixed to the top of the mounting frame 3. The output end of the lifting cylinder 7 passes through the mounting frame 3 and is fixed to a second mounting plate 8. Separating components are provided on both sides of the bottom of the second mounting plate 8 and inside the release groove 26. Each separating component consists of several separating frames 10. Each separating frame 10 has a connecting strip 14 at both ends and a matching connecting groove 15. Two adjacent separating frames 10 are connected by the connecting strip 14 and the matching connecting groove 15. First separating plates 11 are provided at both ends of the bottom of the separating frame 10. Several second partition plates 12 are provided between the two first partition plates 11 to divide the space between them into a receiving space 41 with the same number of perforations. The thickness of the second partition plates 12 is the same as the wall thickness of the thin-walled product 1. The thickness of the first partition plates 11 is half the distance between the two sets of support inserts 2 required for the two thin-walled products 1 on the mold 42. A third partition plate 13 is provided at one end of the bottom of the first partition plates 11 at both ends of the partition frame 10, away from each other. The thickness of the third partition plate 13 is the difference between the thickness of the first partition plate 11 and the second partition plate 12.

[0052] In use, according to the layout of the mold with multiple outputs, such as two rows of outputs with eight outputs per row, the corresponding number of partition frames 10 are connected end to end by the plug strips 14 and plug slots 15 to form a frame that matches the mold layout, and then fixed to the bottom of the second mounting plate 8 by bolts.

[0053] The working principle of the auxiliary production device for thin-walled product manufacturing process provided by this invention is as follows: When the support inserts 2 need to be loaded and installed onto the mold 42, the operator first arranges the support inserts 2 to be installed according to the arrangement on the mold next to the equipment. Then, a robotic arm with an auxiliary device moves to the arrangement above the support inserts 2 to be installed, so that each row of support inserts 2 is located inside the corresponding release groove 26, that is, between the batch clamping components 38 on both sides. At this time, the clamping mechanism 5 is exactly located at the four corners of a group of support inserts 2 at the end. Then, the lifting cylinder 7 is activated to drive the second mounting plate 8 and several partition frames 10 to descend, so that the second partition plate 12 is inserted between two adjacent pairs in each group of support inserts 2, and at the same time, the first partition plate 11 is inserted between two adjacent groups of support inserts 2. Figure 13As shown, the row of support inserts 2 is laterally separated and positioned. Then, the drive cylinder 16 is activated to drive the first guide rod 20 to move. Under the action of the transmission rack 23, transmission gear 25, and transmission rack 24, the second guide rod 21 and the third guide rod 22 are driven to move in the opposite direction to the first guide rod 20, so that the four clamping blocks 19 synchronously clamp a group of inserts on their inner sides. When the second displacement block 18 moves along the inclined first guide rail 27 under the drive cylinder 16, the drive block 40 slides in the inclined drive groove 39, thereby driving the clamping plates 35 on both sides to synchronously clamp or release the sides of the entire row of support inserts 2. In this way, the entire row of support inserts 2 can be clamped at the same time. Then, the required support inserts 2 can be installed on the inner side of the mold 42 at once by the robotic arm.

[0054] When an auxiliary device is needed to remove a row of MIM green blanks and supporting inserts 2 composites from the mold and move them above the sintering tray, after the mold is opened, a robotic arm carries the auxiliary device to the arranged composites to be removed, so that each row of composites is located inside the corresponding release groove 26, that is, between the batch clamping components 38 on both sides. At this time, the clamping mechanism 5 is exactly located at the four corners of one of the composites at the end. Then, the lifting cylinder 7 is activated to drive the second mounting plate 8 and several partition frames 10 to descend, so that the third partition plate 13 is inserted between two adjacent composites. At this time, the second partition plate 12 is located above the composite and does not participate in the clamping work. Figure 14 As shown, the entire row of MIM blanks and support inserts 2 composites are laterally separated and positioned. Then, the drive cylinder 16 is activated, causing the four clamping blocks 19 to simultaneously clamp a group of support inserts 2 on their inner sides; at the same time, the clamping plates 35 on both sides simultaneously clamp or release the sides of the entire row of MIM blanks and support inserts 2 composites, so that the entire row of MIM blanks and support inserts 2 composites can be clamped at the same time. Then, the robotic arm places the MIM blanks and support inserts 2 composites onto the tray. This material handling process has already arranged the MIM blanks and support inserts 2 composites in a regular manner, eliminating the need for subsequent manual arrangement.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A thin-walled product, characterized in that The thin-walled product (1) is a metal piece, the wall thickness of the whole is 0.15-0.40 mm, and a row of perforations is arranged on the metal piece, and the number of the perforations is at least two.

2. A process for the production of thin-walled products as claimed in claim 1, characterized in that, The method comprises the following steps: S1: pressing a supporting insert (2), the supporting insert (2) is pressed by ceramic material to have rigidity, acid resistance and heat resistance; S2: film coating treatment, a plastic coating layer is coated on the MIM production area of the supporting insert (2), and the plastic coating layer is made of a material that can be degraded in the MIM catalytic debinding process; S3: insert injection, the supporting insert (2) after the film coating treatment is placed in a mold (42), metal powder is filled to perform MIM injection molding, a MIM green body is formed, and a composite of the supporting insert (2) and the MIM green body is obtained, and then the composite is placed; S4: debinding, the composite is subjected to catalytic debinding, so that the plastic coating layer and the binder in the MIM green body are catalytically decomposed and removed; S5: sintering, the assembly after the debinding is subjected to sintering treatment, so that the MIM green body is shrunk to form a target thin-walled product, and the supporting insert (2) limits the deformation of the thin-walled product (1) in the sintering process; S6: separating the insert and post-treatment, the supporting insert (2) is separated from the sintered thin-walled product (1), and the separated thin-walled product is subjected to surface finishing to obtain a finished product.

3. The production process according to claim 2, characterized in that, In step S1, the material of the supporting insert (2) is alumina ceramic, the rigidity of the supporting insert (2) meets the requirements of the arrangement of the ejector pin and the support structure, the acid resistance meets the requirement of no decomposition in the debinding process, and the heat resistance meets the requirement of no decomposition and no deformation in the sintering process.

4. The production process according to claim 2, characterized in that, In step S2, the material of the plastic coating layer is POM material, and the thickness of the plastic coating layer is 1.05-1.25 times the size shrinkage rate of the MIM green body from injection molding to sintering.

5. An auxiliary production device for the production process of claim 2, characterized in that, The auxiliary production device is used for clamping and transferring the supporting insert (2) or the composite of the supporting insert (2) and the MIM green body.

6. The auxiliary production device according to claim 5, characterized in that The auxiliary production device comprises a mounting frame (3) and a first mounting plate (4) fixed at the bottom of the mounting frame (3), release grooves (26) are formed on both sides of the first mounting plate (4), clamping mechanisms (5) are installed at the bottom of the first mounting plate (4) and at both ends of the release grooves (26), batch clamping assemblies (38) are arranged on both sides of the release grooves (26), and a separation mechanism (6) is arranged between the mounting frame (3) and the first mounting plate (4).

7. The auxiliary production device according to claim 6, characterized in that The clamping mechanism (5) comprises first guide rails (27) installed at the ends of the release grooves (26) and arranged in a four-corner inclined manner, first displacement blocks (17) are slidably connected to the first guide rails (27) near one side of the length direction end edge of the first mounting plate (4), and second displacement blocks (18) are slidably connected to the first guide rails (27) away from the other side of the length direction end edge of the first mounting plate (4); The first displacement blocks (17) and the second displacement blocks (18) on the same side are fixed with clamping blocks (19) at the ends close to each other, and first guide rods (20) are slidably connected to the inner sides of the four first displacement blocks (17) on the same end; Two second displacement blocks (18) close to each other among the four second displacement blocks (18) at the same end are provided with a second guide rod (21) penetrating and slidingly connected inside, and two second displacement blocks (18) far away from each other are both provided with a third guide rod (22) penetrating and slidingly connected, the first guide rod (20), the second guide rod (21) and the third guide rod (22) are all fixedly connected with a transmission rack one (23), one side of the transmission rack one (23) is meshingly connected with a transmission gear (25), the transmission gear (25) away from one side of the transmission rack one (23) is meshingly connected with a transmission rack two (24), the transmission rack two (24) is fixedly connected with the first guide rod (20), the transmission rack one (23) and the transmission rack two (24) are both fixedly provided with a supporting sliding rod (32) at the bottom, the first mounting plate (4) is provided with a limiting sliding groove matched with the supporting sliding rod (32), and the supporting sliding rod (32) is slidingly connected in the corresponding limiting sliding groove; The first mounting plate (4) is provided with a driving air cylinder (16) at the upper end, and the output end of the driving air cylinder (16) is fixedly connected with the first guide rod (20) at the same end.

8. The auxiliary production device according to claim 7, characterized in that The top of the first displacement block (17) or the second displacement block (18) is provided with a sliding connection groove (29), a buffer block (30) is slidingly connected inside the sliding connection groove (29), one end of the buffer block (30) is provided with a first spring (31), and the two ends of the first spring (31) are connected with the buffer block (30) and the side wall of the sliding connection groove (29) respectively, and the top of the buffer block (30) is fixedly provided with a sliding block (28) slidingly connected on the corresponding first guide rail (27).

9. The auxiliary production device according to claim 8, characterized in that The batch clamping assembly (38) comprises a plurality of second guide rails (33) fixed on the first mounting plate (4) and located on both sides of the release groove (26), a displacement plate (34) is slidingly connected on the same side of a plurality of second guide rails (33), a clamping plate (35) is arranged on one side of the displacement plate (34) close to the release groove (26), a plurality of supporting guide rods (36) are fixed on one side of the clamping plate (35) close to the displacement plate (34), the supporting guide rods (36) penetrate and slidingly connect the same side of the displacement plate (34), and a second spring (37) is sleeved outside the supporting guide rod (36), and the two ends of the second spring (37) are connected on the supporting guide rod (36) and the displacement plate (34) respectively; Both ends of the displacement plate (34) are provided with a driving groove (39), and one end of the second displacement block (18) close to the displacement plate (34) is provided with a driving block (40) matched with the driving groove (39), and the second displacement block (18) is slidingly connected with the displacement plate (34) through the cooperation of the driving block (40) and the driving groove (39). The driving slot (39) is obliquely arranged, and the oblique angle thereof is smaller than that of the first guide rail (27), so that the displacement plate (34) can be driven to slide along the second guide rail (33) by the cooperation between the driving slot (39) and the driving block (40) when the second displacement block (18) slides along the first guide rail (27).

10. The auxiliary production device according to claim 6, characterized in that, The separating mechanism (6) comprises a lifting cylinder (7) fixed on the top of the mounting frame (3), the output end of the lifting cylinder (7) penetrates through the mounting frame (3) and is fixed with a second mounting plate (8), the bottom of the second mounting plate (8) is provided with a separating assembly on both sides and inside the release slot (26), the separating assembly is composed of a plurality of separating frames (10), the two ends of each separating frame (10) are provided with a plug-in strip (14) and a plug-in groove (15) matched with the plug-in strip (14), two adjacent separating frames (10) are connected through the cooperation of the plug-in strip (14) and the plug-in groove (15), the bottom of each separating frame (10) is provided with a first separating plate (11), a plurality of second separating plates (12) are arranged between the first separating plates (11) at both ends, a plurality of second separating plates (12) separate the space between two first separating plates (11) into the same number of accommodation spaces (41) as the number of through holes, the thickness of the second separating plate (12) is the same as the wall thickness of the thin-walled product (1), the thickness of the first separating plate (11) is half of the distance between two sets of supporting inserts (2) required for two thin-walled products (1) on the mold (42), the bottom of the first separating plates (11) at both ends of the separating frame (10) is provided with a third separating plate (13) away from each other at one end, and the thickness of the third separating plate (13) is the difference between the thicknesses of the first separating plate (11) and the second separating plate (12).

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