A method for precision lubrication of components based on multi-material light-cured 3D printing

Abstract

The application discloses a kind of preparation methods of precise lubricating component based on multi-material photocuring 3D printing, comprising: according to the function and operation requirement of the zero price to be processed, the part of needing lubrication in the part model is determined, and the lubrication scheme is determined;The part model is divided into lubrication site and non-lubrication site;According to the lubrication site and non-lubrication site, different functional site materials are selected, and multi-material photocuring 3D printing technology is used to carry out multi-material integrated forming printing on the part model, to obtain precise lubricating component meeting the function and operation requirement;Wherein, self-lubricating composite material is used for printing in the lubrication site, and the remaining non-lubrication site bearing structure is printed using matrix material.The part prepared by the lubricating method provided by the application can realize precise lubrication of the part, and has excellent lubricating performance, structural integrity and high production capacity and other beneficial effects, which provides a reliable solution for engineering application.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of additive manufacturing, and particularly relates to a preparation method of a precise lubricating component based on multi-material light-curing 3D printing. BACKGROUND

[0002] Multi-material light-curing 3D printing is an advanced additive manufacturing (AM) technology that combines the advantages of light-curing 3D printing and multi-material printing. This technology uses ultraviolet light to cure liquid resin layer by layer to print objects, and allows the use of multiple materials in the same model, achieving more diverse functions and appearance effects. By controlling the position and intensity of the light spot, different materials can be cured during printing, such as the combination of hard and soft materials, and the addition of conductive or fluorescent materials. This technology has broad application prospects in the fields of medicine, aerospace, automotive, consumer goods, etc. In the medical field, multi-material light-curing 3D printing can be used to manufacture bionic organs, personalized medical devices and surgical models; in the aerospace field, it can be used to manufacture lightweight structural components and complex parts; in the automotive industry, it can be used to customize automotive parts and improve vehicle performance; in the consumer goods field, it can be used to manufacture personalized products and art.

[0003] Solid self-lubricating materials are special materials that can form a self-lubricating film on the friction surface. Its working principle is to release solid lubricants (such as molybdenum disulfide, polytetrafluoroethylene, etc.) on the friction surface to form a lubricating film, thereby reducing friction and wear. This lubricating film can effectively reduce the friction coefficient between mechanical components, improve operating efficiency, and extend service life. Solid self-lubricating materials can maintain stable lubrication performance under extreme working conditions such as high temperature and high pressure, and are not easily affected by external environment. Therefore, solid self-lubricating materials are widely used in the manufacture of bearings, gears, sliding rails and other mechanical components, and are used in the fields of automobile engines, aerospace devices, electronic equipment, etc. By using solid self-lubricating materials, energy consumption can be effectively reduced, wear can be reduced, and the reliability and performance of equipment can be improved, thereby playing an important role in industrial production.

[0004] However, in extreme environments such as aerospace and nuclear power, traditional lubrication methods such as adding lubricating oil and grease are not suitable because many key friction components require extremely precise lubrication to meet the mechanical operation requirements. However, traditional manufacturing methods and lubrication materials are difficult to achieve precise regional lubrication, so they cannot be applied to increasingly complex friction environments. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application aims to provide a preparation method of a precise lubrication component based on multi-material light-cured 3D printing, so as to solve the technical problem that the existing method cannot precisely realize the on-demand lubrication of the component and thus cannot be applied to complex extreme friction environments.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The present application discloses a preparation method of a precise lubrication component based on multi-material light-cured 3D printing, comprising:

[0008] According to the function and operation requirements of the to-be-processed zero-valued component, the parts that need to be lubricated in the component model are determined, and a lubrication scheme is determined;

[0009] The design model is divided into lubricated parts and non-lubricated parts using CAD software;

[0010] Different functional part materials are selected according to the lubricated parts and non-lubricated parts, and multi-material integrated forming printing is performed on the component model using multi-material light-cured 3D printing technology, so as to obtain a precise lubrication component that meets the functional and operation requirements;

[0011] Among them, the self-lubricating composite material is used for printing in the lubricated parts, and the base material is used for printing in the remaining non-lubricated parts.

[0012] Preferably, the self-lubricating composite material adopts a PEEK-based self-lubricating composite material containing a solid lubricant, and the base material adopts a PEEK resin.

[0013] Further preferably, the PEEK-based self-lubricating composite material containing a solid lubricant is a PEEK-based self-lubricating composite material containing molybdenum disulfide. When used, the photosensitive PEEK resin, the dried molybdenum disulfide and the polytetrafluoroethylene powder are fully mixed and uniform, and are left for 24 hours to remove the bubbles generated by high-speed mixing.

[0014] More preferably, the PEEK-based self-lubricating composite material containing molybdenum disulfide comprises, in terms of mass percentage: 75% to 80% of photosensitive PEEK resin, 10% to 15% of molybdenum disulfide, and 10% to 15% of polytetrafluoroethylene.

[0015] More preferably, the average particle size of the molybdenum disulfide and the polytetrafluoroethylene powder is ≤5 μm.

[0016] More preferably, the photosensitive PEEK resin is prepared according to the following method:

[0017] Step 1: Preparation of light-cured polyether ether ketone oligomer;

[0018] Step 2: uniformly mixing the photocuring polyether ether ketone oligomer with active diluent, functional monomer and photoinitiator to obtain photosensitive PEEK resin;

[0019] In the formula, the photocuring polyether ether ketone oligomer is 40-60 parts, the active diluent is 20-40 parts, the functional monomer is 15-35 parts and the photoinitiator is 1-3 parts in terms of mass fraction.

[0020] Further preferably, the active diluent is one or several of N-vinyl pyrrolidone, trimethylolpropane triacrylate and polyethylene glycol diacrylate; the functional monomer is one or several of tris(2-hydroxyethyl) isocyanuric acid triacrylate, butyl acrylate and glycidyl methacrylate; and the photoinitiator is one or several of 1-hydroxycyclohexyl phenyl ketone, benzophenone and 2,4,6-trimethylbenzoyl diphenyl phosphine oxide.

[0021] Further preferably, in Step 1, the photocuring polyether ether ketone oligomer is prepared by the following specific operation:

[0022] Under nitrogen atmosphere, anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone and hexafluorobisphenol A are fully stirred and dissolved, then anhydrous potassium carbonate is added, the mixture is stirred and heated, saltation is carried out at 120-140℃ for 3-4h, 4,4-difluorobenzophenone is added, the mixture is heated to 170-200℃ and refluxed for 3-4h, the reaction temperature is cooled to 70-80℃, isocyanatoethyl methacrylate and dibutyl tin dilaurate are added and reacted for 5-6h, the reaction liquid is washed and dried after cooling to room temperature to obtain the photocuring polyether ether ketone oligomer.

[0023] More preferably, the molar ratio of anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone, hexafluorobisphenol A, anhydrous potassium carbonate, 4,4-difluorobenzophenone, isocyanatoethyl methacrylate and dibutyl tin dilaurate is (0.7-0.75):(0.07-0.08):(1.25-1.35):(0.05-0.15):(0.15-0.2):(0.1-0.2):(0.03-0.08):(0.0001-0.0002).

[0024] Preferably, the method further comprises the operation of post-processing the obtained precise lubricating member after printing, including one or several of removing the support structure, washing and secondary curing treatment.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The preparation method of the precise lubrication component based on multi-material photocuring 3D printing disclosed by the application first determines the lubrication scheme according to the actual needs, selects different functional part materials according to the lubrication part and the non-lubrication part, and realizes precise lubrication by using the multi-material photocuring 3D printing technology. The advantages mainly include: first, the self-lubricating composite material and the base material can be combined to ensure the formation of a uniform lubricating film on the lubrication part, thereby realizing precise lubrication of the lubrication part and improving the lubrication effect and stability; second, the self-lubricating composite material can be used on the part that needs lubrication, and the base material can be used on the remaining parts to ensure the mechanical properties and structural integrity of the part. This on-demand precise lubrication design scheme effectively solves the problem of uneven distribution of lubricants in the traditional lubrication method; third, by using the multi-material photocuring 3D printing technology, the rapid and customized production of complex components can be realized. Compared with the traditional manufacturing method, the production cycle is short, the cost is low, and the production efficiency is improved and the production cost is reduced. Therefore, the part prepared by using the lubrication method provided by the application can realize precise lubrication of the part and has excellent lubrication performance, structural integrity and high production capacity, and provides a reliable solution for engineering applications.

[0027] Further, from the perspective of material selection, the advantages are also very significant, mainly including: 1) molybdenum disulfide and polytetrafluoroethylene as solid lubricants can form a uniform lubricating film, effectively reducing the friction and wear between materials. After adding molybdenum disulfide to PEEK, the friction coefficient and wear rate are significantly reduced, making the material exhibit more excellent lubrication performance under friction conditions; 2) PEEK has excellent high-temperature resistance and mechanical properties, and can still maintain good physical properties and chemical stability in high-temperature environments, so it can still operate stably in high-temperature environments and is suitable for extreme friction environments such as aerospace and nuclear energy; 3) the addition of molybdenum disulfide and polytetrafluoroethylene can effectively improve the wear resistance of the material, reduce the wear caused by friction, and prolong the service life of the material. Therefore, the part prepared by using molybdenum disulfide and polytetrafluoroethylene to enhance the PEEK self-lubricating composite material can exhibit longer durability under high-friction and high-wear working conditions; 4) PEEK itself has good chemical stability and corrosion resistance, and molybdenum disulfide and polytetrafluoroethylene are also a chemically stable solid lubricant. Therefore, the PEEK self-lubricating composite material with added molybdenum disulfide and polytetrafluoroethylene has excellent corrosion resistance and can be suitable for various harsh chemical environments. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The process block diagram of the preparation method of the precise lubrication component based on multi-material photocuring 3D printing provided by the application;

[0029] Figure 2is a process flow chart of a preparation method of a precise lubricating component based on multi-material light-cured 3D printing provided by an embodiment of the present application;

[0030] Figure 3 is a schematic diagram of a multi-material light-cured 3D printer in the embodiment of the present application;

[0031] In the figure, 1 is a laser system; 2 is a lifting system; 3 is a material pool; 4 is a material discharge pump port; 5 is a scraper; 6 is a material 1 feeding pipe; 7 is a material 2 feeding pipe; 8 is a material 3 feeding pipe; 9 is a washing agent feeding pipe.

[0032] Figure 4 is a schematic diagram of a part precise lubrication on demand in the embodiment 1 of the present application;

[0033] Figure 5 is a schematic diagram of a part precise lubrication on demand in the embodiment 2 of the present application;

[0034] Figure 6 is a schematic diagram of a part precise lubrication on demand in the embodiment 3 of the present application;

[0035] In the figure, A is a lubricating surface. DETAILED DESCRIPTION

[0036] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0037] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0038] Referring to Figure 1 A preparation method of a precise lubricating component based on multi-material light-cured 3D printing, comprising:

[0039] S1: according to the function and working requirement of the part, determine the lubrication position and lubrication scheme of the part;

[0040] S2: use CAD software to divide the part design model into lubrication position and non-lubrication position, and select the material of different functional positions;

[0041] S3: use multi-material light curing 3D printing technology to realize multi-material integrated forming of the part model, and realize precise lubrication on demand.

[0042] Referring to Figure 2 , the application provides a preparation method of a precise lubrication component based on multi-material light curing 3D printing, which comprises the following steps:

[0043] 1) according to the function and working requirement of the part, determine the lubrication position and lubrication scheme, and design the lubrication structure in the design model.

[0044] 2) the self-lubricating composite material adopts PEEK-based self-lubricating composite material containing molybdenum disulfide solid lubricant, and the matrix material adopts PEEK resin. In the used PEEK-based self-lubricating composite material resin, the PEEK resin accounts for 75-80% by mass percentage, the molybdenum disulfide accounts for 10-15%, and the polytetrafluoroethylene accounts for 10-15%. When preparing, the PEEK resin, dry molybdenum disulfide and polytetrafluoroethylene powder are mixed at a speed of 3000 rpm / min using a planetary ball mill mixer, and are left for 24 hours to remove the bubbles generated by high-speed mixing. The average particle size of the used molybdenum disulfide and polytetrafluoroethylene powder is ≤5 μm.

[0045] The used PEEK is a photosensitive PEEK resin with a light curing group, and the preparation method comprises the following steps:

[0046] Step 1: Dissolve anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone and hexafluorobisphenol A in a three-necked flask equipped with reflux condenser under nitrogen atmosphere, stirring temperature and time are 45-55℃ and 30-40min respectively; add anhydrous potassium carbonate, stirring and heating, salt for 3-4h at 120-140℃, then add 4,4-difluorobenzophenone, continue to heat to 170-200℃ for 3-4h, then cool the reaction temperature to 70-80℃, and then add isocyanatoethyl methacrylate and dibutyltin dilaurate, and react for 5-6h, then cool to room temperature, and then wash the reaction liquid with distilled water and anhydrous ethanol for 8-10 times to remove inorganic salts and organic solvents, and finally dry the reaction product at 50-60℃ to obtain a photocurable polyether ether ketone oligomer, wherein the molar ratio of anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone, hexafluorobisphenol A, anhydrous potassium carbonate, 4,4-difluorobenzophenone, isocyanatoethyl methacrylate and dibutyltin dilaurate is 0.7-0.75: 0.07-0.08: 1.25-1.35: 0.05-0.15: 0.15-0.2: 0.1-0.2: 0.03-0.08: 0.0001-0.0002.

[0047] Step 2: uniformly mix the photocurable polyether ether ketone oligomer with active diluent, other functional monomers and photoinitiator to obtain a photosensitive polyether ether ketone (PEEK) resin, wherein the mass fraction of the photocurable polyether ether ketone oligomer is 40-60 parts, the active diluent is 20-40 parts, the other functional monomers are 15-35 parts, and the photoinitiator is 1-3 parts.

[0048] wherein the active diluent is one or more of N-vinyl pyrrolidone (NVP), trimethylolpropane triacrylate (TMPTA) and polyethylene glycol diacrylate (n=9, PEG400DA), the other functional monomers are one or more of tris(2-hydroxyethyl)isocyanurate triacrylate, butyl acrylate (BA) and glycidyl methacrylate, and the photoinitiator is one or more of 1-hydroxycyclohexyl phenyl ketone (Irgacure 184D), benzophenone (winure BP) and 2,4,6-trimethylbenzoyldiphenyl phosphine oxide (TPO).

[0049] 3) According to the lubrication scheme, use CAD software to divide the design model into lubrication parts and non-lubrication parts, and facilitate printing as much as possible, and assign corresponding material properties to each part.

[0050] 4) Import the part model data processed by step 3) into a multi-material photocuring 3D printer (see Figure 3In the embodiment shown, the multi-material light-cured 3D printer used a multi-material feeding device to deliver different resin materials, and according to the lubrication scheme, realized automatic discharge, feeding and scraping, to ensure the material supply when printing different parts of the part. The printer identified the material properties configured in the model file, automatically assigned the process parameters corresponding to each material, and realized synchronous switching of materials and parameters. By controlling the position and intensity of the light spot, the self-lubricating composite material was used to print in the parts that needed lubrication, so that the self-lubricating composite material could form a self-lubricating structure; the base PEEK material was used to print in the remaining load-bearing structure, to ensure the mechanical properties and structural integrity of the part.

[0051] 5) After printing, the part was properly post-processed, such as removing the support structure, cleaning the surface, secondary curing, etc., to ensure the smoothness and integrity of the surface of the part, and finally obtain a part that meets the needs of precise lubrication.

[0052] The application will be further described in detail below with reference to the accompanying drawings:

[0053] Example 1

[0054] A method for preparing a precise lubrication component based on multi-material light-cured 3D printing comprises the following steps:

[0055] 1) According to the function and working requirements of the part, determine the parts that need to be lubricated and the lubrication scheme, and design the lubrication structure in the design model.

[0056] 2) The self-lubricating composite material uses PEEK-based self-lubricating composite material containing molybdenum disulfide solid lubricant, and the base material uses PEEK resin. In the PEEK-based self-lubricating composite material resin used, the PEEK resin accounts for 80%, and the molybdenum disulfide and polytetrafluoroethylene each accounts for 10% by mass percentage. When preparing: mix PEEK resin and dry molybdenum disulfide powder, use a planetary ball mill mixer at a speed of 3000 rpm / min, and stand for 24 h to remove the bubbles generated by high-speed mixing. The average particle size of the solid lubricant (molybdenum disulfide) powder used is ≤5 μm.

[0057] The PEEK used is a photosensitive PEEK resin with photocuring groups, and its preparation method comprises the following steps: (1) stirring and dissolving anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone and hexafluorobisphenol A in a three-necked flask equipped with a reflux condenser under nitrogen, and the stirring temperature and time are 50°C and 30 min respectively; adding anhydrous potassium carbonate, stirring and heating, salting for 3 h at 130°C, adding 4,4-difluorobenzophenone, continuing to heat to 190°C and refluxing for 4 h, cooling the reaction temperature to 80°C, then adding isocyanatoethyl methacrylate and dibutyltin dilaurate and reacting for 6 h, and then washing the reaction liquid with distilled water and anhydrous ethanol 9 times respectively to remove inorganic salts and organic solvents, and finally drying the reaction product at 50°C to obtain a photocuring polyether ether ketone oligomer, wherein the molar ratio of anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone, hexafluorobisphenol A, anhydrous potassium carbonate, 4,4-difluorobenzophenone, isocyanatoethyl methacrylate and dibutyltin dilaurate is 0.75:0.075:1.3:0.1:0.2:0.15:0.06:0.0001; (2) uniformly mixing the photocuring polyether ether ketone oligomer with active diluent, other functional monomers and photoinitiator to obtain a photosensitive polyether ether ketone (PEEK) resin, wherein the mass fraction of the photocuring polyether ether ketone oligomer is 50 parts, the active diluent is N-vinyl pyrrolidone (NVP), the other functional monomers are tris(2-hydroxyethyl) isocyanuric acid triacrylate, and the photoinitiator is 1-hydroxycyclohexyl phenyl ketone (Irgacure 184D).

[0058] 3) According to the lubrication scheme, the design model is segmented into lubricated and non-lubricated parts using CAD software, and the dark position in the cylindrical friction pair is the lubricated position Figure 4 ), and the lubricated and non-lubricated parts are assigned corresponding material properties.

[0059] 4) The part model data optimized by step 3) is imported into a multi-material photocuring 3D printer, and a multi-material feeding device is used to deliver PEEK and PEEK-based self-lubricating composite resin respectively, and automatic discharge, feeding and scraping are realized according to the lubrication scheme to ensure the material supply during printing of different parts. By controlling the position and intensity of the light spot, the self-lubricating composite material is used for printing in the lubricated position, so that the self-lubricating composite material can form a self-lubricating structure; the base PEEK material is used for printing in the remaining load-bearing structure to ensure the mechanical properties and structural integrity of the part. The forming parameters of the self-lubricating composite material are: power density 50 mW / cm 2, exposure time 30 seconds, PEEK matrix material forming parameters: power density 45 mW / cm 2 , exposure time 25 seconds, the printing layer thickness is 100 μm.

[0060] 5) After printing, the parts are properly post-processed, such as removing support structures, cleaning surfaces, secondary curing, etc., to ensure the smoothness and integrity of the parts, and finally obtain parts that meet the needs of precise lubrication.

[0061] Example 2

[0062] A method for preparing a precise lubrication component based on multi-material light-cured 3D printing comprises the following steps:

[0063] 1) According to the function and working requirements of the part, determine the lubrication site and lubrication scheme, and design the lubrication structure in the design model.

[0064] 2) The self-lubricating composite material adopts PEEK-based self-lubricating composite material containing molybdenum disulfide solid lubricant, and the matrix material adopts PEEK resin. The PEEK-based self-lubricating composite resin used contains 75% PEEK resin, 15% molybdenum disulfide, and 10% polytetrafluoroethylene, respectively. When preparing: mix PEEK resin and dry polytetrafluoroethylene powder, use a planetary ball mill mixer at a speed of 3000 rpm / min, and stand for 24 h to remove the bubbles generated by high-speed mixing. The average particle size of the solid lubricant (polytetrafluoroethylene) powder used is ≤5 μm.

[0065] The PEEK used is a photosensitive PEEK resin with photocurable groups. Its preparation method includes the following steps: (1) Anhydrous toluene, allyl bisphenol A, N-methyl-2-pyrrolidone and hexafluorobisphenol A are stirred and dissolved in a three-necked flask equipped with a reflux condenser under nitrogen purging. The stirring temperature and time are 50℃ and 30min, respectively. Anhydrous potassium carbonate is added, and the mixture is stirred and heated to 130℃ for 3h to form a salt. 4,4-Difluorobenzophenone is added, and the mixture is heated to 190℃ and refluxed for 4h. The reaction temperature is cooled to 80℃, and then isocyanate methacrylate is added. Ethyl methacrylate and dibutyltin dilaurate were reacted for 6 hours. After cooling to room temperature, the reaction liquid was washed 9 times with distilled water and anhydrous ethanol to remove inorganic salts and organic solvents. Finally, the reaction product was dried at 50°C to obtain a light-cured polyether ether ketone oligomer. The molar ratio of anhydrous toluene, allyl bisphenol A, N-methyl-2-pyrrolidone, hexafluorobisphenol A, anhydrous potassium carbonate, 4,4-difluorobenzophenone, isocyanate ethyl methacrylate and dibutyltin dilaurate was 0.75:0.075:1.3:0.1:0.2:0.15:0.06:0.0001. (2) The photocurable polyether ether ketone oligomer is uniformly mixed with reactive diluent, other functional monomers and photoinitiator to obtain photosensitive polyether ether ketone (PEEK) resin. Based on the mass fraction of the photocurable polyether ether ketone oligomer, there are 50 parts of photocurable polyether ether ketone oligomer, 30 parts of reactive diluent, 25 parts of other functional monomers and 2 parts of photoinitiator. The reactive diluent is N-vinylpyrrolidone (NVP), the other functional monomer is tri(2-hydroxyethyl) isocyanurate triacrylate, and the photoinitiator is 1-hydroxycyclohexylphenyl ketone (Irgacure184D).

[0066] 3) Based on the lubrication scheme, use CAD software to divide the design model into lubricated and non-lubricated parts. The darker areas in the spherical friction pair represent the lubricated areas. Figure 5 It assigns corresponding material properties to lubricated and non-lubricated parts.

[0067] 4) The part model data optimized by step 3) is imported into a multi-material light-cured 3D printer. The multi-material light-cured 3D printer uses a multi-material feeding device to deliver PEEK and PEEK-based self-lubricating composite material resin respectively. According to the lubrication scheme, automatic discharge, feeding and scraping are realized to ensure the material supply during printing of different parts of the part. The printer identifies the material properties configured in the model file and automatically assigns the process parameters corresponding to each material to realize synchronous switching of materials and parameters. By controlling the position and intensity of the light spot, the self-lubricating composite material is used to print in the parts that need to be lubricated, so that the self-lubricating composite material can form a self-lubricating structure; the base PEEK material is used to print in the remaining load-bearing structures to ensure the mechanical properties and structural integrity of the part. The forming parameters of the self-lubricating composite material are: power density 50 mW / cm 2 , exposure time 30 seconds, and the forming parameters of the PEEK base material are: power density 45 mW / cm 2 , exposure time 25 seconds, and the printing layer thickness is 100 μm.

[0068] 5) After printing, the part is properly post-processed, such as removing the support structure, cleaning the surface, and secondary curing, to ensure the smoothness and integrity of the part surface, and finally obtain a part that meets the precise lubrication requirements.

[0069] Example 3

[0070] A method for preparing a precise lubrication component based on multi-material light-cured 3D printing comprises the following steps:

[0071] 1) According to the function and working requirements of the part, determine the parts that need to be lubricated and the lubrication scheme, and design the lubrication structure in the design model.

[0072] 2) The self-lubricating composite material uses PEEK-based self-lubricating composite material containing molybdenum disulfide solid lubricant, and the base material uses PEEK resin. The PEEK-based self-lubricating composite material resin used contains 75% PEEK resin, 10% molybdenum disulfide, and 15% polytetrafluoroethylene by mass percentage. When preparing, mix PEEK resin and dry molybdenum disulfide with polytetrafluoroethylene powder at a speed of 3000 rpm / min using a planetary ball mill mixer, and stand for 24 hours to remove the bubbles generated by high-speed mixing. The average particle size of the molybdenum disulfide and polytetrafluoroethylene powder used is ≤5 μm.

[0073] The used PEEK is a photosensitive PEEK resin with photocuring groups, and its preparation method comprises the following steps: (1) stirring and dissolving anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone and hexafluorobisphenol A in a three-necked flask equipped with a reflux condenser under nitrogen atmosphere, and the stirring temperature and time are 50°C and 30 min respectively; adding anhydrous potassium carbonate, stirring and heating, salting for 3 h at 130°C, adding 4,4-difluorobenzophenone, continuing heating to 190°C for 4 h, cooling the reaction temperature to 80°C, then adding isocyanatoethyl methacrylate and dibutyl tin dilaurate for reaction for 6 h, and after cooling to room temperature, washing the reaction liquid with distilled water and anhydrous ethanol for 9 times respectively to remove inorganic salts and organic solvents, and finally drying the reaction product at 50°C to obtain a photocuring polyether ether ketone oligomer, wherein the molar ratio of anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone, hexafluorobisphenol A, anhydrous potassium carbonate, 4,4-difluorobenzophenone, isocyanatoethyl methacrylate and dibutyl tin dilaurate is 0.75:0.075:1.3:0.1:0.2:0.15:0.06:0.0001. (2) uniformly mixing the photocuring polyether ether ketone oligomer with active diluent, other functional monomers and photoinitiator to obtain a photosensitive polyether ether ketone (PEEK) resin, and taking the mass fraction of the photocuring polyether ether ketone oligomer as a basis, the photocuring polyether ether ketone oligomer is 50 parts, the active diluent is 30 parts, the other functional monomers are 25 parts, and the photoinitiator is 2 parts; wherein the active diluent is N-vinyl pyrrolidone (NVP), the other functional monomers are tris(2-hydroxyethyl) isocyanuric acid triacrylate, and the photoinitiator is 1-hydroxycyclohexyl phenyl ketone (Irgacure 184D).

[0074] 3) According to the lubrication scheme, the design model is segmented into lubrication parts and non-lubrication parts using CAD software, the dark position in the gear is the lubrication position Figure 6 ), and the lubrication parts and non-lubrication parts are assigned with corresponding material properties.

[0075] 4) The part model data optimized by step 3) is imported into a multi-material light-cured 3D printer. The multi-material light-cured 3D printer uses a multi-material feeding device to deliver PEEK and PEEK-based self-lubricating composite material resin respectively, and realizes automatic discharge, feeding and scraping according to the lubrication scheme to ensure the material supply when printing different parts of the part. The printer identifies the material properties configured by the model file and automatically assigns the process parameters corresponding to each material to realize synchronous switching of materials and parameters. By controlling the position and intensity of the light spot, the self-lubricating composite material is used to print in the parts that need to be lubricated, so that the self-lubricating composite material can form a self-lubricating structure; the base PEEK material is used to print in the remaining load-bearing structures to ensure the mechanical properties and structural integrity of the part. The forming parameters of the self-lubricating composite material are: power density 50 mW / cm 2 , exposure time 30 seconds, and the forming parameters of the PEEK base material are: power density 45 mW / cm 2 , exposure time 25 seconds, and the printing layer thickness is 100 μm.

[0076] 5) After printing, the part is properly post-processed, such as removing the support structure, cleaning the surface, secondary curing, etc., to ensure the smoothness and integrity of the surface of the part, and finally obtain a part that meets the needs of precise lubrication.

[0077] The above content only illustrates the technical idea of the present application and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the claims of the present application.

Claims

1. A method for the fabrication of precision lubricated components based on multi-material light-cured 3D printing, characterized in that, The application relates to a method for manufacturing a precise lubricating component, and belongs to the technical field of lubricating component manufacturing. According to the function and operation requirements of a to-be-processed zero price, the part of the product model that needs to be lubricated is determined, and a lubricating scheme is determined; The product model is divided into lubricating parts and non-lubricating parts; Different functional part materials are selected according to the lubricating parts and the non-lubricating parts, and a multi-material integrated forming printing of the product model is carried out by using a multi-material light-curing 3D printing technology, so that a precise lubricating component meeting the function and operation requirements is obtained; The PEEK-based self-lubricating composite material containing molybdenum disulfide is used for printing in the lubricating parts, and the base material is used for printing in the remaining non-lubricating parts. The PEEK-based self-lubricating composite material containing molybdenum disulfide comprises, in mass percentage, 75-80% of photosensitive PEEK resin, 10-15% of molybdenum disulfide and 10-15% of polytetrafluoroethylene. The photosensitive PEEK resin is prepared by the following method: Step 1: preparing a light-curing polyether ether ketone oligomer; Step 2: uniformly mixing the light-curing polyether ether ketone oligomer with an active diluent, a functional monomer and a photoinitiator to obtain the photosensitive PEEK resin. The light-curing polyether ether ketone oligomer is 40-60 parts, the active diluent is 20-40 parts, the functional monomer is 15-35 parts and the photoinitiator is 1-3 parts.

2. The method for fabrication of precision lubricated components based on multi- material photocured 3D printing according to claim 1, characterized in that, The base material adopts PEEK resin.

3. The method for fabrication of precision lubricated components based on multi- material light-cured 3D printing according to claim 1, characterized in that, The average particle size of the molybdenum disulfide and the polytetrafluoroethylene powder is less than or equal to 5 microns.

4. The method of claim 1, wherein the method is a method of fabricating a precision lubricated component based on multi-material light-cured 3D printing. The active diluent is one or more of N-vinylpyrrolidone, trimethylolpropane triacrylate and polyethylene glycol diacrylate; the functional monomer is one or more of tri(2-hydroxyethyl)isocyanuric acid triacrylate, butyl acrylate and glycidyl methacrylate; and the photoinitiator is one or more of 1-hydroxycyclohexyl phenyl ketone, benzophenone and 2,4,6-trimethylbenzoyl diphenyl phosphine oxide.

5. The method of claim 1, wherein the method further comprises: In step 1, the specific operation of preparing the light-curing polyether ether ketone oligomer is as follows: Under a nitrogen atmosphere, anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone and hexafluorobisphenol A are fully stirred and dissolved, then anhydrous potassium carbonate is added, stirring and heating, salt formation is carried out at 120-140 DEG C for 3-4 hours, then 4,4-difluorobenzophenone is added, heating to 170-200 DEG C and refluxing for 3-4 hours, the reaction temperature is cooled to 70-80 DEG C, and isocyanatoethyl methacrylate and dibutyl tin dilaurate are added and reacted for 5-6 hours, then the reaction liquid is washed and dried after being cooled to room temperature, and the light-curing polyether ether ketone oligomer is prepared.

6. The method of claim 5, wherein the method further comprises: The molar ratio of the anhydrous toluene, allyl bisphenol A, N-methyl 2-pyrrolidone, hexafluorobisphenol A, anhydrous potassium carbonate, 4,4-difluorobenzophenone, isocyanatoethyl methacrylate and dibutyl tin dilaurate is (0.7-0.75):(0.07-0.08):(1.25-1.35):(0.05-0.15):(0.15-0.2):(0.1-0.2):(0.03-0.08):(0.0001-0.0002).

7. The method according to any one of claims 1 to 6, wherein the method is a method for the fabrication of precision lubricated components based on multi-material light-cured 3D printing. The printing further comprises a post-processing operation of the obtained precision lubricating member after the printing is completed, including one or more of removing the support structure, cleaning, and secondary curing treatment.

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