635 results about "Powder bed" patented technology

The invention provides a real-time defect detection and self-adaptive repair method for additive manufacturing, which belongs to the technical field of additive manufacturing and comprises the following steps: capturing an image of a powder bed after powder spreading; identifying powder spreading defects in each layer of image after powder spreading, and fitting a bounding box according to the category and position information of the powder spreading defects; taking the interior of the contour boundary corresponding to the slice of the current layer as a key printing area, comparing a bounding box with the key printing area, judging whether the bounding box coincides with the key printing area or not, if so, triggering a self-adaptive repair mechanism, and if not, performing a laser scanning action; after printing is completed, an image of the printed part is extracted and processed, the edge contour of the printed part of the current layer is extracted through a trained network edge detection algorithm, and registration and overlapping comparison are conducted on the edge contour and the design contour of the slice of the current layer; and calculating the area deviation between the edge contour of the printing part of the current layer and the design contour of the slice of the current layer, and deciding to pause or continue printing according to the area deviation.

The invention provides an automobile brake caliper manufacturing method based on a selective laser melting additive manufacturing technology, which comprises the following steps: carrying out structural region division on a three-dimensional digital model, and formulating an SLM process parameter strategy of a structural region, the SLM process parameter strategy comprising adjustment of laser power, scanning speed, scanning spacing and powder layer thickness; according to a three-dimensional digital model of the brake calipers and an SLM process parameter strategy, additive powder is laid in a powder bed of SLM equipment, the surface of the powder bed is scanned layer by layer through high-power-density laser beams, powder particles are selectively melted, laser energy density input is controlled, thermophysical characteristics of powder materials are matched, microstructure evolution is controlled, and the brake calipers are manufactured. And after one layer is melted and solidified, the powder bed descends by the height of one layer thickness, a new powder layer is spread out, the process is circulated till additive manufacturing of the brake calipers is completed, and the effects of being light in weight, high in structural strength and good in heat dissipation effect are achieved.

Methods and apparatus for modulating a multi-mode shaped beam in powder bed additive manufacturing are provided. The method comprises the following steps: analyzing a geometric model of a component to obtain a plurality of feature regions which comprise at least one part of the component and correspond to different structure types; according to the structure type and in combination with material attributes and / or process targets, distributing corresponding light beam modes for the plurality of feature regions, wherein the light beam modes are modulated to have different light intensity distributions and / or phases; the light beam mode is applied to a light beam, so that the light beam is switched to the light beam mode corresponding to the light beam mode when the light beam scans a plurality of feature areas on a powder bed, matched light spot regulation and control are carried out on different feature areas in the additive manufacturing process, and therefore different forming requirements of various structure types are met in the same component at the same time.

The invention discloses a multi-zone temperature control device of a powder bed for LPBF, and belongs to the technical field of additive manufacturing. According to the temperature control device, four non-contact infrared heaters are arranged on the upper portion of the inner wall of a printing forming bin, and a heating plate formed by splicing a plurality of electric heating blocks is adopted at the bottom of a printing platform for contact heating; multi-zone flexible heating is achieved, independent temperature control can be achieved according to different zone requirements of parts, and the problem that in the prior art, temperature uniformity and zone control are insufficient is solved. The device is provided with an infrared temperature sensor and a thermocouple sensor to monitor the temperature in real time, the heating power is rapidly and accurately adjusted in combination with a PID control algorithm, and the temperature control response speed and precision are improved. The control module is intelligent, strategies can be automatically adjusted according to real-time data, working condition changes are adapted, the intelligent and self-adaptive capacity of the system is improved, and the requirements for modern manufacturing of high-precision and complex parts and the like are met.

The invention belongs to the technical field of cable processing, and relates to a preparation method and application of a flexible superconducting coaxial cable outer conductor. The preparation method comprises the following steps: mixing Nb powder and Ti powder by adopting a vibrating ball mill to prepare NbTi composite powder; a substrate of laser powder bed melting equipment is preheated, the NbTi composite powder is spread on the substrate of the laser powder bed melting equipment, a melting powder layer is scanned through the laser powder bed melting technology, a three-dimensional communicated grid structure is formed through interlayer staggered scanning, finally, the NbTi net-shaped alloy pipe is placed in a strong acid solution to be soaked for a short time, redundant metal powder is removed, and the NbTi net-shaped alloy pipe is obtained. And finally, the preparation of the flexible superconducting coaxial cable outer conductor for the quantum computer is realized.

The invention provides a multi-model driven powder bed additive manufacturing method and device. The method comprises the following steps: establishing at least one first 3D model and applying a first process parameter to the at least one first 3D model; establishing at least one second 3D model completely or partially overlapping the at least one first 3D model and applying a second process parameter different from the first process parameter to the at least one second 3D model; and driving the at least one high-energy beam by using the at least one first 3D model and the at least one second 3D model, respectively, so that the at least one high-energy beam performs first scanning treatment corresponding to the first process parameter and second scanning treatment corresponding to the second process parameter on the powder bed to manufacture the component layer by layer, therefore, accurate scanning of different process parameters on the same position is realized, and the manufacturing precision and the microstructure quality of the component are improved.

The invention discloses a TiAl alloy electron beam selective melting and shot peening strengthening in-situ compounding manufacturing method and device, and relates to the technical field of additive manufacturing. The method comprises the following steps: establishing a three-dimensional digital model of a to-be-printed part, and performing slicing and layering to obtain layered scanning data; under the vacuum condition, TiAl alloy powder is spread on the preheated base plate according to the set thickness, and a powder bed is formed; according to the layered scanning data, scanning and melting the powder bed through a focused electron beam, completing single-layer scanning and melting, completing scanning and melting layer by layer until the part is printed and cooled, and recovering unmelted TiAl alloy powder; and under the vacuum condition, the surface of the printed part is scanned and heated through a defocusing electron beam, TiAl alloy powder is adopted as shot blasting powder, the surface of the heated part is subjected to microparticle shot blasting strengthening treatment, after the treatment is finished, cooling is conducted, scattered shot blasting powder is recycled, and the finished TiAl alloy part is obtained. By means of the collaborative process design of electron beam selective melting and in-situ high-temperature microparticle shot blasting and device integration, the problems that in TiAl alloy additive manufacturing, cracking is prone to occurring, and the strengthening effect is poor are solved.

The invention provides a support-free forming method for laser powder bed melting, and relates to the technical field of metal additive manufacturing, and the horizontal support-free forming method for laser powder bed melting comprises the following steps: S1, printing a first-layer support-free overhanging surface by using an out-of-focus laser beam, so that a first-layer metal powder is in a sintering state, and a first-layer sintering layer is formed; s2, printing a predetermined number of layers of support-free overhanging surfaces layer by layer by using an out-of-focus laser beam, melting each new printing layer, remelting the previous printing layer, and avoiding remelting to the lower surface of the first sintering layer; and S3, after printing of the support-free overhanging surface with the preset number of layers is completed, subsequent layer printing is conducted. The first sintering layer is printed by using the out-of-focus laser beam, so that a supporting foundation is provided for a subsequent overhanging structure, and the problem of collapse of the first layer is avoided. Fusion and combination of each new printing layer and the previous printing layer are controlled, remelting to the lower surface of the first layer is avoided, the upper surface and the lower surface which are not supported are smooth, and powder adhesion is avoided.

The invention provides a multi-scale simulation method for high-fidelity selective laser melting forming and phase field-lattice Boltzmann coupling, and belongs to the technical field of selective laser melting numerical simulation. The method comprises the specific steps that a selective laser melting powder laying process model is constructed based on a discrete element method, and a randomly stacked powder bed model is obtained; a high-fidelity selective laser melting forming thermal fluid dynamic model is established, and macroscopic temperature distribution and flow field distribution of a molten pool are simulated; establishing a phase field model-lattice Boltzmann coupling model; and extracting temperature gradient, solidification velocity and melt flow velocity data of local positions of the boundary of the steady-state molten pool, and simulating solidification structure evolution under flowing of molten metal in the molten pool by taking the data as initial conditions of the phase field-lattice Boltzmann coupling model. According to the method, through high-fidelity multi-scale simulation, the relation between the process parameters and the microstructure is established more comprehensively, and reliable numerical support is provided for selective laser melting process optimization and microstructure prediction.

The invention discloses a dynamic silicone rubber microsphere and a preparation method thereof, and the preparation method comprises the following steps: injecting a polysiloxane solution containing dynamic bonds onto a super-amphiphobic coating to form a liquid column, spontaneously breaking under the driving of interfacial tension to form polymer liquid drops, heating to evaporate a solvent to form polymer microspheres, and drying to obtain the dynamic silicone rubber microsphere. And initiating crosslinking through ultraviolet irradiation to form the dynamic silicone rubber microspheres. A polar dynamic bond is introduced into the PDMS elastomer, so that the surface energy of the elastomer can be improved, the dynamic silicone rubber microspheres are prepared on the super-amphiphobic surface, the controllability of the form, size and distribution of a silicone rubber powder material is further realized, and a core material is provided for 3D printing of an elastomer polymer powder bed.

The invention provides SLM metal multi-material additive manufacturing equipment based on a liquid metal suspended powder bed technology. Liquid metal is adopted to replace a conventional powder pile and serve as supporting filler of a forming bin, metal powder is made to suspend on the liquid metal, layer-by-layer laying and melting forming of the metal powder are conducted, meanwhile, after one material is machined, layer-by-layer powder recycling can be conducted, and therefore mutual pollution of various kinds of powder can be effectively avoided, and the production efficiency is improved. And the recycling rate of the powder can be greatly increased, and practical application and popularization of the SLM multi-material additive manufacturing technology are facilitated.

A method of three-dimensional printing can include iteratively applying a polymer build material as individual layers to a powder bed, where the polymer build material includes from about 80 wt % to 100 wt % polymeric particles, and based on a three-dimensional object model, selectively applying a coalescing agent onto individual layers of the polymer build material. The coalescing agent can include an aqueous liquid vehicle and a coalescing solvent that depresses a melting point of the polymeric particles. The method can include exposing the powder bed to heat to selectively coalesce portions of individual layers of the polymer build material in contact with the coalescing solvent. The heat may not be sufficient to coalesce the polymer build material that is not in contact with the coalescing solvent and may be sufficient to fuse the polymeric particles in contact with the coalescing solvent together to form a three-dimensional object.

The invention discloses a powder bed molten part CT (Computed Tomography) detection reference block and a manufacturing method thereof. The reference block comprises a reference block matrix and a defect unit, the test block base body is of a stepped shaft structure formed by two cylinders with different diameters and is used for a contrast test of CT detection on the thickness sensitivity of a powder bed molten part; and the defect unit consists of a plurality of flat-bottomed holes with different diameters, spherical defects and columnar defects which are formed in the test block base body, and is used for verifying the defect detection capability of CT detection on the powder bed molten part. After the reference block and the manufacturing method disclosed by the invention are adopted, recognizable defect unit details can be analyzed by using a CT image of the reference block, so that the influence of unmelted metal powder in the defect of a powder bed melted workpiece on CT detection sensitivity and defect recognition is determined; the reliability of the CT detection result of the powder bed molten part is improved; and defect evaluation is assisted.

The invention discloses a heterogeneous material powder bed laser additive manufacturing device and method.The heterogeneous material powder bed laser additive manufacturing device comprises a fixed-point powder suction ultrasonic powder feeding system, an electrostatic powder laying system and a powder bed additive manufacturing forming system, and the fixed-point powder suction ultrasonic powder feeding system and the electrostatic powder laying system are both arranged in the powder bed additive manufacturing forming system. The automatic powder spreading device has a heterogeneous material powder spreading mode of ultrasonic powder feeding and electrostatic powder spreading, the utilization rate of materials is effectively improved, the manufacturing efficiency is improved, the scraper, the electrostatic powder spreading device and the powder spreading trolley are combined into a whole, the flexibility and applicability of equipment are enhanced, the conversion and waiting time between the equipment can be shortened, the production efficiency is improved, and the production cost is reduced. The powder feeding device has the advantages that automatic replacement of the powder feeding needle tubes is achieved, manual intervention is not needed, the working efficiency is greatly improved, the powder feeding needle tubes with different calibers are adopted, the powder laying quality of the connecting positions of the heterogeneous materials is further improved while the powder laying efficiency is not lost, and the final interface connecting effect of the heterogeneous materials is indirectly enhanced.

The invention discloses a crack-free laser powder bed additive manufacturing method for gamma'reinforced nickel-based alloy, which comprises the following steps: firstly, preparing raw material alloy powder, and detecting the total content of Al and Ti elements in the alloy powder; then the powder is loaded into a forming bin, a layer of powder is quantitatively laid every time, a powder bed is scanned through laser, laser energy input and the scanning speed are controlled, the powder bed is rapidly melted and solidified, a layer of solid is formed, the layer height of the solid is 0.02-0.05 mm, and the higher the total content of Al and Ti elements in the alloy powder is, the smaller the layer height is; and after a layer of entity is formed, the forming substrate is controlled to descend by the height of a construction layer, a layer of powder is laid again, laser scanning is conducted again, and the steps are repeated till construction is completed. According to the method, a cooperative control strategy of thin-layer thermal control is adopted, nucleation and expansion of cracks are restrained by controlling the descending height of a formed substrate and controlling laser parameters, and the crack-free laser additive meeting the requirements is manufactured.

The invention relates to a cooling device and a cooling method for powder bed electron beam 3D printing equipment. The cooling device comprises an argon charging port, an argon discharging port and a cooling device, an air cooling structure; the water cooling structure is arranged on the outer side face of a bottom plate of the forming chamber; cooling the copper block; a temperature measuring device; and the cooling gas conveying device, the cooling liquid conveying device and the temperature measuring device are respectively connected with the upper computer. Argon can be introduced into the forming chamber through the argon inflation inlet, the air cooling structure is arranged on the inner wall of the forming cylinder, and even if gas leaks into the forming cylinder, printing of parts in the forming cylinder cannot be damaged; the water cooling structure is arranged outside the forming cylinder, water cannot enter the forming cylinder even if water leaks, and the safety of the part printing process is guaranteed; the temperature measuring device is adopted for monitoring the temperature in the forming cylinder in real time, the upper computer can control cooling gas and cooling liquid according to the temperature of the part, and the forming quality of the part is guaranteed.

The invention belongs to the technical field of additive manufacturing, and particularly relates to an additive manufacturing method for synchronously carrying out powder bed powder laying and laser melting preheating, which comprises the following steps: S1, after a current layer is formed, a powder laying mechanism starts to lay powder; s2, scanning powder in an unshielded area on the powder bed in a grating manner by adopting a low-power or large-spot laser; s3, dividing the powder in the shielding area into a marched side area and a non-marched side area of the powder spreading mechanism; s4, along with operation of the powder spreading mechanism, the areas change in real time; s5, after powder laying is finished, the whole powder of the powder bed continues to be scanned through the small-power laser grating type; and S6, repeating the steps S1 to S5. The powder on the powder bed is preheated in real time through low-power laser, the heating device has the advantages of being high in heating speed, large in heating area and the like, the defect that the transmission efficiency of bottom plate preheating and heat radiation preheating is low is overcome, and the defect that the temperature of the powder bed is obviously reduced due to the fact that the powder laying process of large-size parts is too long is overcome.

The invention discloses a laser powder bed melting thermal scanning chromatography quality evaluation method and system. According to the laser powder bed fusion thermal scanning chromatography quality evaluation method, obtained layer section radiation data is fused and updated in a gradient image mode by using a signal processing technology and an image fusion technology, a layer section fused gradient image is generated, gain noise reduction processing is performed on the layer section fused gradient image, and the layer section fused gradient image is obtained. The method comprises the following steps: acquiring a layer cross section fusion gradient image, converting the layer cross section fusion gradient image into a pseudo-color image, performing gradient anomaly region extraction operation on the pseudo-color image, establishing a correlation model among gradient anomaly, printing anomaly and printing defects, and realizing online quality evaluation by utilizing the established correlation model and combining layer cross section radiation data acquired in real time. Gradient abnormity in the printing process is monitored in real time, and possible printing defects are predicted, so that measures can be taken in time for intervention and adjustment, the defective rate of products is reduced, and cost reduction and efficiency improvement are achieved.

Provided is an ultrafast laser shock forging assisted laser powder bed fusion (LPBF) method with an ultrafast laser to allow on-line control of a stress field for an additive-manufactured component. Technical points of the present disclosure: During a LPBF-based additive manufacturing process, ultra-high-pressure shock waves induced byan ultrafast laser are allowed to forge a molten layer on-line, and a stress field distribution of a molten layer can be accurately controlled layer by layer, so as to reduce a residual stress level of an additive-manufactured component and improve the mechanical properties of an additive-manufactured component, thereby allowing the high-performance LPBF-based additive manufacturing. The present disclosure has the following advantages: Due to the layer-by-layer shock forging mode, the method can control a stress field with a high accuracy and a better effect, will not cause secondary pollution or destruction, and exhibits excellent technical applicability.

The invention discloses a method for obtaining a high-mechanical-property high-entropy alloy laser powder bed melting forming component, which comprises the following steps of: printing a three-dimensional solid component by using mixed powder of a high-entropy alloy and ceramic particles as a raw material and adopting a powder-based laser powder bed melting process; and the high-entropy alloy component which is high in compactness, free of cracks, fine in grain and excellent in mechanical property can be obtained. According to the obtained high-entropy alloy laser powder bed melting forming component, multiple kinds of strengthening such as grain refinement and tissue structure transformation occur in the laser powder bed melting process, and compared with a high-entropy alloy original material, the high-entropy alloy laser powder bed melting forming component has better mechanical performance. The obtained high-entropy alloy laser powder bed melt forming component can be applied to the fields of aerospace engine part manufacturing, anti-corrosion coatings and the like, and the requirement for the high-strength high-entropy alloy component is met.

The invention discloses an in-situ heat treatment laser powder bed melting device and an application method thereof, and belongs to the technical field of metal additive manufacturing. The device comprises a forming chamber, a laser powder bed melting system, a heat treatment system and a control system, the laser powder bed melting system comprises a powder laying and feeding system and a laser system, the powder laying and feeding system is used for conveying metal powder into the heat treatment system, and the laser system is used for conducting laser printing on the metal powder in the heat treatment system; the heat treatment system is used for conducting in-situ heat treatment on slices or components formed through laser printing, and the control system is used for controlling operation of all the systems. The laser powder bed melting technology and the heat treatment technology are combined, the forming process and the heat treatment process are alternately carried out, the printing efficiency is improved, high-quality forming is achieved, meanwhile, residual stress can be rapidly eliminated, the mechanical property can be improved, and the forming quality of metal laser powder bed melting large-layer-thickness printing is greatly improved.

The present disclosure relates to a fabrication and evaluation process for testing new metallic alloy chemistries and compositions for laser powder bed fusion (L-PBF). The new methodology is efficient and effective for new compositions with a minimal investment of generating large quantities of powder feedstock for required in conventional AM processing. The method allows for subsurface melting of the new alloy composition by varying the depth of penetration by a control of the input power level, power deposition rate, and rastering scan strategy. Post-mortem analysis of the subsurface microstructure permits an analysis of the durability and suitability of the new metallic alloy for this manufacturing mode. The method utilizes available infrastructure, technology, and characterization techniques.

The invention discloses a selective laser melting simulation method simultaneously considering molten pool and microstructure evolution, which mainly comprises establishment and calculation methods of powder laying and a powder melting and solidification process model, and comprises the following specific steps: setting the geometric dimension and the number of internal crystal grains of a substrate to generate a polycrystalline substrate; establishing a discrete element model, simulating a roll shaft powder spreading process, and obtaining particle information; introducing a sequence parameter, constructing a free energy density functional, and establishing a heat-flow-microstructure strong coupling phase field model; constructing a powder bed geometric model, distributing grain orientation, and dividing grids for the powder bed geometric structure; setting material attributes and boundary conditions, and solving the phase field model by a finite element method; and carrying out visualization processing on a calculation result to obtain a molten pool and a microstructure morphology. Evolution behaviors of the molten pool and the microstructure in the selective laser melting process can be simulated at the same time, alternate simulation and data transmission of the powder laying process and the laser scanning process are achieved, and therefore actual machining production is guided, and technological parameters are optimized.

The invention discloses a method for refining nano ceramic synergistic modified Al-Si alloy primary silicon based on laser additive manufacturing, which comprises the following steps of: uniformly mixing Al-Si alloy powder with TiB2 and Al2O3 nano ceramic under the protection of inert gas through a ball mill by adopting a ball milling process to obtain ceramic nano strength enhanced Al-Si alloy composite powder; and the nano ceramic modified Al-Si alloy powder is fused layer by layer through laser powder bed fusion forming equipment, and a to-be-established target part is formed. According to the method, when the nano-ceramic reinforced Al-Si alloy melt is solidified, Al2O3 nano-particles are similar to a Si crystal structure and have a good interface coherence relation to serve as heterogeneous nucleation points of primary silicon, the nucleation rate of the primary silicon is increased, and the size of the primary silicon is refined; the TiB2 nanoparticles are distributed on a solid-liquid interface, Si atoms can be prevented from diffusing and gathering towards Si-Si clusters to a certain extent, growth of a primary silicon phase is inhibited, morphology regularization and size refinement of primary silicon are promoted, meanwhile, matrix grains can be effectively improved, and the mechanical property of the Al-Si alloy is remarkably improved.

Multi-source sensing fusion laser powder bed fusion five-axis additive and subtractive composite equipment comprises a machine tool base of a laser powder bed, a gantry type machining platform is connected to the machine tool base, and a sealing cover body is connected to the gantry type machining platform; a swing head sliding table is installed on an XY-axis movement mechanism on the gantry type machining platform, and the five-axis material reducing process is achieved. A galvanometer sliding table is installed on an XY axis movement mechanism on the gantry type machining platform, and laser scanning is conducted on the laser powder bed to achieve the laser powder bed material adding process. Large-angle five-axis additive and subtractive composite manufacturing on the powder bed is achieved through the combination of the gantry type three-axis movement mechanism and the A / C-axis swing head type electric spindle, and the rigidity of the movement mechanism is guaranteed; real-time monitoring of acoustic, mechanical and optical signals and the like in the part additive and subtractive machining process is achieved through various types of sensors, and the comprehensive quality of the part machining process and the finished part machining process is predicted.

The invention discloses a composite powder spreading device for large-size multi-electron-beam selective melting forming. The composite powder spreading device comprises a powder falling device, a powder falling opening partition plate, a composite scraper mounting frame, a rear rolling shaft, a powder collecting device and a scraper blade. The upper end of the powder falling device is connected with the powder conveying channel; the powder collecting device moves to the position below the powder falling device when receiving the powder, leaves the position below the powder falling device after receiving the powder, and moves along the forming area to spread the powder; the powder falling opening partition plate is opened when the powder collecting device receives the powder and is closed after the powder is received; a rear rolling shaft and a scraper blade are mounted on the composite scraper mounting frame; the scraper blade and the rear rolling shaft synchronously move along with the powder collecting device, the scraper blade is used for scraping the powder in the powder laying process, and the rear rolling shaft is used for compacting the scraped powder. According to the method, the powder spreading state of the powder bed can be improved, the powder spreading uniformity of the large-amplitude powder bed is improved, pores among powder are reduced, the stability of the electron beam selective melting process is optimized, and the printing success rate is increased.

The embodiment of the invention discloses a preheating process parameter optimization method for inhibiting powder blowing of an electron beam powder bed, relates to the technical field of additive manufacturing, and aims to solve the problems that the development of preheating process parameters of the electron beam powder bed is difficult and the period is long. The preheating process parameter optimization method for suppressing powder blowing of the electron beam powder bed comprises the following steps: acquiring a preheating current gradient growth mode and bottom plate preheating process parameters adopted by a target process; determining target powder bed preheating key parameters based on the preheating current gradient growth mode and the bottom plate preheating process parameters; and the target powder bed preheating key parameters have no powder blowing phenomenon in the printing process. By means of the technological parameter development process, preheating technological parameters can be rapidly obtained, and the development progress of melting forming of the electron beam powder bed is shortened.

The invention discloses an additive manufacturing powder bed preheating system and method based on hot air-partition radiation synergy. The additive manufacturing powder bed preheating system comprises a preheating outer box, a powder bed, a hot air circulating system, a partition radiation heating system and a layering synergy controller. The method has the beneficial effects that an upper-layer steady-state optimization and lower-layer dynamic compensation framework is adopted, wherein the upper layer aims at energy efficiency and temperature uniformity, and the temperature and the air speed of a hot air inlet are optimized; and the lower layer is based on real-time temperature feedback, the partition radiation power is adjusted through a feedback + feedforward decoupling algorithm, local temperature disturbance is compensated, hot air rapidity and partition radiation accuracy are fused, the problems of response lag, space coupling and laser preheating cooperation deficiency are solved, rapid, uniform and dynamic regulation and control of the temperature field of the powder bed are achieved, the additive manufacturing quality is improved, and the production efficiency is improved. The method is suitable for high-precision manufacturing of various high polymer materials.

The invention discloses a post-treatment method for high-toughness modification of a molten titanium-based composite material of a laser powder bed, relates to the field of metal-based composite materials, and aims to solve the problem that the room-temperature toughness of the titanium-based composite material is not matched. According to the preparation method, a near-alpha titanium alloy or alpha + beta double-phase titanium alloy is selected as a matrix to be mixed with a ceramic reinforced phase, and then the titanium-based composite material is prepared; performing hot isostatic pressing treatment in the alpha + beta two-phase region; and the titanium-based composite material subjected to hot isostatic pressing is subjected to solution aging treatment, then water cooling is conducted, and then furnace cooling is conducted after aging treatment. Through the combination of hot isostatic pressing and solid solution aging treatment, the room-temperature plasticity is remarkably improved while the strength is almost not reduced, and high compactness, high strength and high toughness of the titanium-based composite material are achieved. The mechanical property of the titanium-based composite material is greatly improved, the problem that the toughness of the titanium-based composite material is not matched at room temperature is solved, and the method has important significance in wide application and popularization of the laser powder bed molten titanium-based composite material in engineering practice.

The invention discloses a heat input control method for a multi-electron-beam powder bed melting additive manufacturing process, which adopts a finite element simulation means to control heat input in the additive manufacturing process and can be applied to research and development of powder bed preheating process parameters in the multi-electron-beam powder bed melting additive manufacturing forming process. Through cooperative work of a forming electron beam and a preheating electron beam, a temperature field is dynamically regulated and controlled in combination with finite element simulation, and the problems of large temperature gradient, high residual stress and multiple crack defects in a traditional process are solved; the electron beam is preheated to continuously heat the non-melting area, double-beam energy distribution is optimized in combination with an energy balance equation, and the forming quality and the process efficiency are remarkably improved.