A hot bed support plate and a riveting die for assembling the same

Abstract

The application discloses a hot bed support plate and a riveting die thereof. The hot bed support plate comprises a metal support plate body, which is provided with arrayed embedded grooves. Independent permanent magnetic blocks are embedded in the grooves in an interference fit, and fastening is realized through deformation protrusions on groove walls without the need of gluing. The back surface of the support plate is provided with a containing frame for containing the protruding part of the magnetic block, so that the weight and cost are reduced while the magnetic attraction strength is ensured. The matched riveting die comprises upper and lower die assemblies. The lower die is provided with a magnetic block fixing jig with a containing groove and a pushing mechanism. During assembly, the magnetic block is placed in the groove, the support plate is positioned and placed, the upper die is pressed downward to make the jig go down, and the pushing block synchronously pushes the magnetic block into the embedded groove to realize one-time precise pressing and embedding. The die improves the assembly efficiency and product consistency, is firm and reliable, and is suitable for batch production.

Description

Technical Field

[0001] This application relates to the technical field of heated beds for 3D printers, and more specifically, to a heated bed support plate and a riveting mold for assembling the same. Background Technology

[0002] As a representative of additive manufacturing, 3D printing technology has been widely used in rapid prototyping, small-batch production, and personalized manufacturing. In mainstream 3D printing processes such as fused deposition modeling, the stability, flatness, and auxiliary forming functions of the printing platform (usually called a heated bed) are crucial, directly affecting the first layer adhesion quality and overall forming accuracy of the printed part.

[0003] A heated bed system typically consists of multiple parts, including heating elements, temperature sensors, insulation layers, and support structures. Among these, the heated bed support plate is a crucial mechanical component located beneath the heated bed, playing a key role in load-bearing, fixing, and stabilizing the system. It is usually made of metal or high-performance composite materials and must possess good rigidity, thermal conductivity, and dimensional stability. In common magnetically detachable printing platform solutions, the heated bed support plate not only needs to provide stable support for the heating plate above but also needs to integrate magnetic adsorption functionality to facilitate the quick removal of the forming surface with the flexible steel plate after printing.

[0004] In related technologies, the magnetic integration solution for heated bed support plates involves directly pasting or embedding a large magnetic patch (usually a rubber magnet or sintered magnet) onto the surface of the support plate. This magnetic patch attracts a flexible steel plate (often coated with a printing surface material) through its own magnetic field. Using this technology, the magnetic materials, especially high-performance neodymium iron boron sintered magnets, are expensive. To cover the entire printing area, a large magnetic patch area is required, significantly increasing the material cost of a single support plate, which is detrimental to large-scale production and market penetration. Furthermore, the magnetic patch is typically directly adhered to the support plate surface using adhesive. Under long-term thermal cycling (heating and cooling of the heated bed) and mechanical vibration, the adhesive may age and fail, causing the magnetic patch to shift, warp, or even detach partially. This misalignment not only affects the uniformity of adsorption, causing localized bulging or weak adsorption on the flexible steel plate, but also directly affects the overall flatness of the heated bed, thus impairing print quality. Summary of the Invention

[0005] To address the issues of high cost and short lifespan of existing heated bed support plates, this application provides a heated bed support plate and a riveting mold for its assembly.

[0006] In a first aspect, this application provides a heated bed support plate, which adopts the following technical solution: A heated bed support plate includes a support plate body, wherein the support plate body has a plurality of interlocking grooves extending through its own thickness, and a magnetic block is embedded in each interlocking groove.

[0007] By adopting the above technical solution, multiple small, independent magnetic blocks replace traditional large-area magnetic patches, significantly reducing the amount of expensive magnetic materials used. This cost-saving effect is particularly pronounced for large-size printing platforms. The magnetic blocks are mechanically fixed within the fitting grooves, fundamentally avoiding the risk of magnet displacement or detachment due to adhesive aging and failure under thermal cycling and vibration, thus ensuring the long-term stability of magnetic adsorption. The gaps between the dispersed magnetic blocks reduce obstruction to heat conduction on the support plate and lower the risk of overall deformation caused by the difference in thermal expansion coefficients between the magnetic material and the metal substrate, helping to maintain the flatness of the heated bed.

[0008] Preferably, the support plate body has a deformation protrusion on the peripheral wall of each of the fitting grooves. When the magnetic block is embedded in the fitting groove, the deformation protrusion cooperates with the magnetic block to make the magnetic block interference fit into the fitting groove.

[0009] By adopting the above technical solution, the deformable protrusion and the magnetic block form an interference fit, generating a continuous radial clamping force, which makes the magnetic block more securely installed in the slot. It can effectively resist vibration and impact during use, prevent the magnetic block from loosening or falling out of the slot, and does not require additional glue or fasteners. The magnetic block can be reliably fixed by physical compression, which simplifies the assembly steps and improves production efficiency.

[0010] Preferably, the thickness of the support plate body is less than the thickness of the magnetic block, and a receiving frame for accommodating the magnetic block is formed on the back side of each of the fitting slots.

[0011] By adopting the above technical solution, using a relatively thinner support plate body with a thickness less than that of the magnetic block, and setting a receiving frame on the back that mainly serves as a barrier and positioning element, it is possible to significantly reduce the amount of metal material used in the support plate body while ensuring the stable installation of the magnetic block and providing sufficient magnetic field strength, thereby directly reducing the overall weight of the heated bed support plate.

[0012] Preferably, the heated bed support plate is provided with multiple positioning holes.

[0013] By adopting the above technical solution, the heated bed support plate can be quickly and accurately positioned and installed on the 3D printer frame through the positioning holes, ensuring the relative positional accuracy of the support plate with the heating plate, motion system and other components, and also facilitating the standardization and interchangeability of components.

[0014] Secondly, this application provides a riveting mold for assembling a heated bed support plate, which adopts the following technical solution: A riveting mold for assembling a heated bed support plate includes an upper mold assembly and a lower mold assembly. The lower mold assembly is provided with an elastic connector, which is connected to a magnetic block fixing fixture. The top surface of the magnetic block fixture has a plurality of receiving grooves for accommodating magnetic blocks. The arrangement of the receiving grooves is consistent with the arrangement of fitting grooves on the support plate body. The magnetic block fixture is provided with a plurality of positioning pins, which match positioning holes on the support plate body, and the number of positioning holes matches the number of positioning pins. The multiple positioning pins are aligned one-to-one with the multiple positioning holes. The bottom surface of the magnetic block fixing fixture is provided with a sliding groove corresponding to the position of each receiving groove, and the sliding groove is connected to the receiving groove. A push block is slidably inserted in each sliding groove. The top surface of the push block is provided with a push protrusion that matches the receiving groove. The push protrusion is inserted into the receiving groove. The bottom of the push block is connected and fixed to the lower mold assembly. The upper mold assembly is used to lift and press the magnetic block fixing fixture and the support plate body connected to it.

[0015] By adopting the above technical solution, the receiving groove and positioning pin on the magnetic block fixing fixture ensure the precise alignment of each magnetic block with the fitting groove of the support plate. The magnetic block is pressed into multiple grooves at one time by the pressure of the upper mold assembly, realizing automated and batch precision assembly, which greatly improves production efficiency and product consistency.

[0016] Preferably, the lower mold assembly includes a base, a lower template connected to the base, and a first guide sleeve disposed on the lower template. The elastic connector and the push block are both connected to the lower template. The upper mold assembly includes a connecting base and an upper template disposed at the bottom of the connecting base. A first guide post is connected to the upper template, and the first guide post slides in cooperation with the first guide sleeve. A plurality of pressure blocks are disposed at the bottom of the upper template.

[0017] By adopting the above technical solution, the sliding fit between the first guide post and the first guide sleeve ensures accurate alignment and smooth movement of the upper and lower molds during the mold closing process, preventing damage to the magnetic block or support plate due to misalignment and ensuring the reliability of the pressing process.

[0018] Preferably, the magnetic block fixing fixture is provided with a second guide sleeve, and the lower template is provided with a second guide post, the second guide post and the second guide sleeve being slidably engaged.

[0019] By adopting the above technical solution, the cooperation between the second guide post and the guide sleeve is specifically used to guide and fix the position of the magnetic block fixing fixture relative to the lower template, thereby further ensuring the alignment of the position of the magnetic block in the fixture with the position of the support plate fitting groove and improving the assembly accuracy.

[0020] Preferably, limiting elastic bodies are provided on both sides of the lower template, and the limiting elastic bodies are used to abut against the upper template.

[0021] By adopting the above technical solution, the limiting elastomer can provide flexible buffering and physical limiting when the upper template is pressed into place, avoiding damage to the magnetic block, support plate or mold itself due to excessive pressure, thus playing a protective role.

[0022] Preferably, the lower template is further provided with a pressure sensor, and the sensing probe of the pressure sensor abuts against the magnetic block fixing fixture.

[0023] By adopting the above technical solution, the pressure sensor can monitor the pressure applied to the magnetic block fixing fixture or support plate in real time during the pressing process, ensuring that the pressure value is within the set range, avoiding insufficient pressure leading to poor fitting or excessive pressure causing damage, and improving process controllability and product quality stability.

[0024] Preferably, the elastic connector is a spring.

[0025] By adopting the above technical solution and using springs as elastic connectors, the structure is simple and reliable, providing stable and consistent elastic support for the magnetic block fixing fixture, enabling it to smoothly reset after being compressed, and ensuring the stability and durability of the mold for repeated use.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By using multiple small, independent magnetic blocks instead of traditional large-area magnetic patches, the amount of expensive magnetic materials used is significantly reduced, especially for large-size printing platforms, where cost savings are even more pronounced. The magnetic blocks are fixed in the fitting grooves by mechanical interlocking, fundamentally avoiding the risk of magnet displacement or detachment due to aging and failure of adhesives under thermal cycling and vibration, thus ensuring the long-term stability of magnetic adsorption. The gaps between the dispersed magnetic blocks reduce the obstruction of heat conduction to the support plate and lower the risk of overall deformation caused by the difference in thermal expansion coefficients between the magnetic material and the metal substrate, helping to maintain the flatness of the heated bed.

[0027] 2. The receiving groove and positioning pin on the magnetic block fixing fixture ensure the precise alignment of each magnetic block with the fitting groove of the support plate. The upper mold assembly presses the magnetic block into multiple grooves at once, realizing automated and batch precision assembly, which greatly improves production efficiency and product consistency. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of a heated bed support plate at a first angle according to this embodiment.

[0029] Figure 2This is a schematic diagram of the second angle of a heated bed support plate according to this embodiment.

[0030] Figure 3 This is a schematic diagram of the riveting mold in this embodiment.

[0031] Figure 4 This is a structural schematic diagram of the magnetic block fixing fixture at the first angle in this embodiment.

[0032] Figure 5 This is a structural schematic diagram of the magnetic block fixing fixture from a second angle in this embodiment.

[0033] Figure 6 This is a schematic diagram of the lower mold assembly in this embodiment.

[0034] Figure 7 This is a schematic diagram of the upper mold assembly in this embodiment.

[0035] Reference numerals: 1. Heated bed support plate; 11. Support plate body; 12. Fitting groove; 13. Magnetic block; 14. Deformation protrusion; 15. Receiving frame; 16. Positioning hole; 2. Riveting die; 21. Upper die assembly; 211. Connecting base; 212. Upper template; 213. First guide post; 214. Pressure block; 22. Lower die assembly; 221. Base; 222. Lower template; 223. First guide sleeve; 224. Elastic connector; 225. Push block; 226. Second guide post; 227. Limiting elastic body; 228. Pressure sensor; 23. Magnetic block fixing fixture; 231. Receiving groove; 232. Positioning pin; 233. Slide groove; 234. Second guide sleeve; Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Reference Figure 1-2A heated bed support plate 1 includes a support plate body 11, which is made of metal and has sufficient rigidity to support the heating plate and printing platform above. Multiple interlocking grooves 12, penetrating the thickness of the support plate body 11, are pre-machined on its plane. These interlocking grooves 12 are arranged in an array or distributed according to magnetic adsorption requirements. An independent magnetic block 13 is embedded in each interlocking groove 12. The magnetic block 13 is made of high-performance neodymium iron boron or other permanent magnet materials, and its dimensions match the interlocking groove 12. Using multiple small, independent magnetic blocks 13 instead of traditional large-area magnetic patches significantly reduces the amount of expensive magnetic materials used, thereby lowering the overall cost. Simultaneously, the magnetic blocks 13 are directly fixed in the interlocking grooves 12 by mechanical interlocking, avoiding the use of adhesives and fundamentally eliminating the risk of adhesive layer aging, magnet displacement, or detachment due to thermal cycling and mechanical vibration, thus improving product reliability and service life.

[0038] Reference Figure 1-2 To further ensure the secure fit of the magnetic block 13 within the fitting groove 12, an inwardly protruding deformation protrusion 14 is designed on the inner peripheral wall of each fitting groove 12 of the support plate body 11. When the magnetic block 13 is pressed into the fitting groove 12, the deformation protrusion 14 interferes with the outer surface of the magnetic block 13, forming an interference fit. This interference fit generates a continuous radial clamping force, which firmly fixes the magnetic block 13 within the groove, effectively resisting vibration and impact during use and preventing the magnetic block 13 from loosening or falling out. This method achieves fastening through physical compression, eliminating the need for additional glue or fasteners and simplifying the assembly process.

[0039] Reference Figure 1-2 To reduce the overall weight of the support plate and save materials, the thickness of the support plate body 11 is designed to be less than the thickness of the embedded magnetic block 13. On the back side of the support plate body 11, corresponding to the perimeter of each fitting slot 12, a raised receiving frame 15 is integrally formed. The receiving frame 15 encloses a cavity, and when the magnetic block 13 is inserted into the fitting slot 12 from the front, the portion exceeding the thickness of the support plate body 11 is accommodated within the receiving frame 15 on the back side. The receiving frame 15 mainly serves to contain and position the magnetic block 13, preventing it from detaching from the back side, while allowing for the use of a relatively thinner support plate body 11. This reduces the consumption of metal materials and the overall weight of the product while ensuring the stable installation of the magnetic block 13 and providing sufficient magnetic field strength.

[0040] Reference Figure 1-2 In addition, multiple positioning holes 16 are provided on the support plate body 11. These positioning holes 16 are used to cooperate with corresponding mounting posts or screws on the 3D printer frame to achieve rapid and accurate positioning and installation of the heated bed support plate 1, ensuring its relative positional accuracy with other components such as the heating plate and motion system, and facilitating standardized production and component interchangeability.

[0041] Reference Figure 3 To achieve efficient and precise assembly of the aforementioned heated bed support plate 1, a riveting mold 2 for assembling the heated bed support plate was specially designed. The mold includes an upper mold assembly 21 and a lower mold assembly 22.

[0042] Reference Figure 3-6 The lower mold assembly 22 mainly includes a base 221, a lower template 222 fixed on the base 221, and a first guide sleeve 223 installed on the lower template 222. An elastic connector 224 is provided on the lower template 222; in this embodiment, the elastic connector 224 is preferably a spring. The upper end of the spring is connected to a magnetic block fixing fixture 23. The top surface of the magnetic block fixing fixture 23 is recessed downwards with several receiving grooves 231. The arrangement of these receiving grooves 231 is completely consistent with the arrangement of the fitting grooves 12 on the support plate body 11. Each receiving groove 231 is used to pre-place a magnetic block 13. Multiple vertically upward positioning pins 232 are also fixed on the magnetic block fixing fixture 23. The position, number, and size of these positioning pins 232 precisely match the positioning holes 16 on the support plate body 11, enabling one-to-one alignment.

[0043] Reference Figure 4-5 On the bottom surface of the magnetic block fixing fixture 23, corresponding to the position of each receiving groove 231, a sliding groove 233 is provided, and the sliding groove 233 communicates upward with the corresponding receiving groove 231. A push block 225 is slidably installed in each sliding groove 233. The top of the push block 225 has an upwardly protruding push protrusion, which passes through the sliding groove 233 and extends into the receiving groove 231 above, but its height is slightly lower than the depth of the receiving groove 231 so as not to affect the placement of the magnetic block 13. The bottom of the push block 225 is directly connected and fixed to the lower template 222. The magnetic block fixing fixture 23 is elastically connected to the lower template 222 by a spring, so that the fixture can elastically float vertically relative to the lower template 222 within a certain range.

[0044] Reference Figure 4-5 To ensure that the magnetic block fixing fixture 23 is accurately positioned in the horizontal direction, a second guide sleeve 234 is installed on it, and a second guide post 226 is provided on the lower template 222 to cooperate with it. The second guide post 226 is inserted into the second guide sleeve 234 to form a sliding fit, thereby guiding and limiting the magnetic block fixing fixture 23 to move smoothly in the vertical direction and preventing it from swinging horizontally.

[0045] Reference Figure 3 and Figure 7The upper mold assembly 21 includes a connecting base 211 and an upper template 212 fixed to the bottom of the connecting base 211. A first guide post 213 and several pressure blocks 214 are fixed to the bottom of the upper template 212. When the mold is closed, the first guide post 213 is inserted downward into the first guide sleeve 223 on the lower template 222 to achieve precise guidance between the upper and lower mold assemblies 22, ensuring a smooth and accurate alignment during the mold closing process.

[0046] Reference Figure 3 and Figure 6 On opposite sides of the bottom of the lower template 222, limiting elastomers 227, such as urethane blocks or spring pillars, are also installed. When the upper template 212 moves downward to press, the limiting elastomers 227 can contact the corresponding parts of the upper template 212, providing flexible buffering and final stroke limit to prevent excessive pressure from damaging the magnet 13, support plate, or mold.

[0047] Reference Figure 6 In addition, a pressure sensor 228 is installed on the lower template 222. The sensing probe of the pressure sensor 228 extends upward and keeps in contact with the bottom surface of the magnetic block fixing fixture 23, which is used to monitor the pressure value applied to the magnetic block fixing fixture 23 or the support plate body 11 during the pressing process in real time.

[0048] The working process and principle of the riveting mold 2 are as follows: Before assembly, each magnetic block 13 is placed into its respective receiving groove 231 of the magnetic block fixing fixture 23. Next, the support plate body 11 is placed on top of the magnetic block fixing fixture 23 with its front side facing down, and precise positioning is achieved by aligning the positioning holes 16 on the support plate body 11 and fitting them into the positioning pins 232 on the fixture. At this time, each fitting groove 12 on the support plate body 11 is aligned with the corresponding magnetic block 13 in the receiving groove 231 on the lower fixture. Then, the upper mold assembly 21 is driven to descend, and the upper template 212 is smoothly pressed down by the guidance of the first guide post 213 and the first guide sleeve 223. The upper template 212 first contacts the front side of the support plate body 11 and continues to apply downward pressure. The pressure is transmitted to the magnetic block fixing fixture 23 through the support plate body 11. After being pressed, the fixture overcomes the elastic force of the lower spring and drives the magnetic blocks 13 on it to move downward together. Since the push block 225 is fixed to the lower template 222, when the magnetic block fixing fixture 23 moves downward, the push protrusion of the push block 225, which originally extended into the receiving groove 231, is equivalent to pushing upward relative to the downward-moving magnetic block 13. This pushes the magnetic block 13 in the receiving groove 231 smoothly and forcefully upward into the corresponding fitting groove 12 of the support plate body 11 until the magnetic block 13 and the deformation protrusion 14 of the fitting groove 12 are interference-fitted and fully in place. During this process, the cooperation between the second guide post 226 and the second guide sleeve 234 ensures the stability of the vertical movement of the magnetic block fixing fixture 23, thereby ensuring that the magnetic block 13 is vertically embedded without deviation. The limiting elastic body 227 provides buffering and limiting when the upper template 212 is pressed down to the set position. The pressure sensor 228 monitors the pressure value in real time to ensure that the pressing force is within the set safe and effective range, avoiding insufficient pressure leading to loose fitting or excessive pressure damaging the parts. After the pressing and embedding is completed, the upper mold assembly 21 rises, and the magnetic block fixing fixture 23, under the restoring force of the spring, returns to its original position along with the support plate body 11. At this time, the magnetic block 13 is firmly embedded in the support plate, and it can be removed to obtain the assembled heated bed support plate 1 product. The mold of this application realizes the one-time, automated, and precise pressing and embedding assembly of multiple magnetic blocks 13 with the support plate, which greatly improves production efficiency and product consistency, and effectively ensures the firmness and positional accuracy of the magnetic block 13.

[0049] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heated bed support plate, characterized in that: It includes a support plate body, on which a plurality of fitting grooves are formed that penetrate through its own thickness, and a magnetic block is embedded in each fitting groove.

2. The heated bed support plate according to claim 1, characterized in that: The support plate body has a deformation protrusion on the peripheral wall of each of the fitting slots. When the magnetic block is inserted into the fitting slot, the deformation protrusion cooperates with the magnetic block to make the magnetic block interference fit into the fitting slot.

3. The heated bed support plate according to claim 1, characterized in that: The thickness of the support plate body is less than the thickness of the magnetic block, and a receiving frame for accommodating the magnetic block is formed on the back side of each of the fitting slots.

4. A heated bed support plate according to claim 1, characterized in that: The heated bed support plate is provided with multiple positioning holes.

5. A riveting die for assembling a heated bed support plate, characterized in that: The device includes an upper mold assembly and a lower mold assembly. The lower mold assembly is provided with an elastic connector, which is connected to a magnetic block fixing fixture. The top surface of the magnetic block fixture is recessed with several receiving grooves for accommodating magnetic blocks. The arrangement of the receiving grooves is consistent with the arrangement of the fitting grooves on the support plate body. The magnetic block fixture is provided with multiple positioning pins, which match the positioning holes on the support plate body. The number of positioning holes matches the number of positioning pins, and the multiple positioning pins are aligned one-to-one with the multiple positioning holes. The bottom surface of the magnetic block fixing fixture is provided with a sliding groove corresponding to each receiving groove, and the sliding groove is connected to the receiving groove. A push block is slidably inserted in each sliding groove. The top surface of the push block is provided with a push protrusion that matches the receiving groove. The push protrusion is inserted into the receiving groove. The bottom of the push block is connected and fixed to the lower mold assembly. The upper mold assembly is used to lift and press the magnetic block fixing fixture and the support plate body connected to it.

6. The riveting mold for assembling a heated bed support plate according to claim 1, characterized in that: The lower mold assembly includes a base, a lower template connected to the base, and a first guide sleeve disposed on the lower template. The elastic connector and the push block are both connected to the lower template. The upper mold assembly includes a connecting base and an upper template disposed at the bottom of the connecting base. A first guide post is connected to the upper template, and the first guide post slides in cooperation with the first guide sleeve. Several pressure blocks are disposed at the bottom of the upper template.

7. The riveting mold for assembling a heated bed support plate according to claim 6, characterized in that: The magnetic block fixing fixture is provided with a second guide sleeve, and the lower template is provided with a second guide post, the second guide post and the second guide sleeve being slidably engaged.

8. A riveting die for assembling a heated bed support plate according to claim 6, characterized in that: Limiting elastic bodies are provided on both sides of the lower template, and the limiting elastic bodies are used to abut against the upper template.

9. A riveting mold for assembling a heated bed support plate according to claim 6, characterized in that: The lower template is also equipped with a pressure sensor, and the sensing probe of the pressure sensor abuts against the magnetic block fixing fixture.

10. A riveting die for assembling a heated bed support plate according to claim 5, characterized in that: The elastic connector is a spring.

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