An electric pulse assisted 3D printing device for forming titanium-aluminum alloy

Abstract

The utility model relates to 3D printing device technical field provides a kind of electric pulse auxiliary 3D printing device for titanium-aluminium alloy forming, including printing device main body, printing device main body has base and the printing substrate of electric conduction, base is connected with the first electrode and second electrode for with high-frequency pulse electric current generating device electric connection, printing substrate has the bearing substrate for being used to carry titanium-aluminium alloy workpiece, printing substrate also has first connecting part and second connecting part, first connecting part and second connecting part are located at the two ends of bearing substrate along first direction opposite, first connecting part is connected with first electrode and electrically connected, first connecting part is connected with second electrode and electrically connected;The size of bearing substrate along second direction is greater than the size of first connecting part, second connecting part, so that printing substrate presents the structure of thick middle and thin two ends, can promote the macroscopic and microscopic crack inhibition of titanium-aluminium alloy workpiece, and improve the mechanical properties of titanium-aluminium alloy workpiece.

Description

TECHNICAL FIELD

[0001] The utility model belongs to 3D printing device technical field especially relates to a kind of electric pulse auxiliary 3D printing device for titanium-aluminium alloy forming. BACKGROUND

[0002] Titanium-aluminium alloy (TiAl) is a new generation of key materials in aerospace field, with low density (only half of nickel-based alloy), high high-temperature strength, excellent anti-creep and oxidation resistance, etc., widely used in aero-engine blade and light-weight structural component manufacturing, which can significantly improve engine thrust-to-weight ratio and fuel efficiency.

[0003] However, titanium-aluminium alloy has high room-temperature brittleness and poor machinability, and traditional casting cannot meet the high-precision forming requirements of complex components. Additive manufacturing (3D printing) technology is considered as an important way to break through the manufacturing bottleneck of titanium-aluminium alloy due to its near-net-shape forming and high design freedom, especially suitable for rapid manufacturing of complex geometric components in aerospace field.

[0004] Currently, based on additive manufacturing (3D printing) technology, selective laser melting (SLM) is one of the mainstream technologies for additive manufacturing of titanium-aluminium alloy, but there are significant challenges in the printing process: due to the concentration of laser energy input and the rapid cooling of molten pool, titanium-aluminium alloy is prone to thermal stress concentration during rapid solidification, resulting in macro and micro cracks, pores and other defects, which seriously affect the density and mechanical properties of the formed parts. In addition, the existing technology often uses overall preheating of the substrate (such as heating to 800-1200℃) to suppress cracks, but high-temperature environment can cause the sealing performance of the equipment to decrease and energy consumption to increase, and it is difficult to ensure the uniformity of titanium-aluminium alloy organization, which limits its large-scale application.

[0005] Current domestic and foreign main technical schemes for additive manufacturing of titanium-aluminium alloy include:

[0006] I. Electron beam melting (EBM) technology: by melting metal powder under vacuum environment with high-energy electron beam, assisted by powder preheating (up to 1000℃ or more), residual stress can be effectively reduced and cracks can be suppressed. For example, Italian Avio Vero and Swedish Arcam AB company successfully prepared titanium-aluminium alloy parts with mechanical properties close to as-cast by EBM technology, and applied them to aero-engine blade manufacturing. However, EBM technology relies on complex vacuum system and high-precision electron gun, with high equipment cost, which is difficult to popularize and apply.

[0007] II. Selective laser melting (SLM) technology: by optimizing laser power, scanning rate and other parameters (such as Some researchers have improved the forming quality through two-step heat treatment, or by using high-temperature substrate preheating (such as Gussone et al. heating the substrate to 800 to 1200°C) to reduce the cooling rate. However, these methods have narrow process windows, and the formed parts still suffer from microcracks and fluctuations in mechanical properties. Furthermore, high-temperature substrate preheating leads to high energy consumption and short equipment lifespan.

[0008] III. Pulsed Current Assisted Technology: Recent studies have shown that high-frequency pulsed currents can locally regulate the flow characteristics of the molten pool and heal microcracks through electroplastic effects (such as grain boundary slip and dislocation movement) and electromagnetic force effects (e.g., Zhao et al. found that pulsed currents significantly improve the ductility of Ti-Al alloys). However, existing research mainly focuses on the post-processing stage and has not yet achieved in-situ integration with the SLM process, making it difficult to directly apply to the continuous printing of complex components.

[0009] It is evident that existing titanium-aluminum alloy SLM additive manufacturing technology has the following key problems:

[0010] a. Severe cracking: High cooling rate leads to uneven solidification of the molten pool, which makes it very easy to generate cracks, especially in large-sized components;

[0011] b. Poor process stability: It relies on the overall preheating of the high-temperature substrate, which not only consumes a lot of energy and causes rapid equipment wear, but also makes it difficult to accurately control the local thermal field, resulting in uneven microstructure composition;

[0012] c. Technological barriers: Under the background of foreign EBM technology blockade, China urgently needs to develop independent and controllable high-quality titanium-aluminum alloy additive manufacturing solutions. Utility Model Content

[0013] The purpose of this invention is to overcome at least one of the shortcomings of the prior art and to provide an electro-pulse assisted 3D printing device that can be used for titanium-aluminum alloy forming.

[0014] The technical solution of this utility model is: an electro-pulse assisted 3D printing device for forming titanium-aluminum alloys, comprising a printing device body, the printing device body having a base and a conductive printing substrate, the base being connected to a first electrode and a second electrode for electrical connection with a high-frequency pulse current generating device, the printing substrate being mounted on the base, the printing substrate having a support substrate for supporting titanium-aluminum alloy workpieces, the printing substrate also having a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being disposed at opposite ends of the support substrate along a first direction, the first connecting portion being connected to and electrically conductive with the first electrode, and the first connecting portion being connected to and electrically conductive with the second electrode;

[0015] The dimension of the carrier substrate along the second direction is larger than the dimensions of the first connecting portion and the second connecting portion, so that the printing substrate has a structure that is thick in the middle and thin at both ends.

[0016] Optionally, the base is a ceramic base.

[0017] Optionally, the base is provided with a first heat dissipation device; and / or, the base is provided with a second heat dissipation device on at least one side.

[0018] Optionally, the base is provided with a groove, and the carrier substrate of the printed substrate is located above the groove.

[0019] Optionally, the base has a first mounting hole and a second mounting hole, which are spaced apart. The first electrode is columnar and disposed in the first mounting hole, and the second electrode is columnar and adapted to be installed in the second mounting hole. The two ends of the groove are respectively connected to the first mounting hole and the second mounting hole.

[0020] Optionally, the first electrode has a first threaded hole at its end, the second electrode has a second threaded hole at its end, the first connecting part has a first through hole, the second connecting part has a second through hole, the first connecting part is fixed to the first electrode by a first locking member threaded to the first threaded hole, and the second connecting part is fixed to the second electrode by a second locking member threaded to the second threaded hole.

[0021] Optionally, the printing substrate is a metal substrate, and the front side of the printing substrate is flat, while the back side of the printing substrate is provided with an anti-deformation structure.

[0022] Optionally, the printing substrate is elliptical;

[0023] Alternatively, the carrier substrate is rectangular, the first connecting portion and the second connecting portion are rectangular and integrally connected to opposite ends of the carrier substrate, and the first connecting portion and the carrier substrate, and the second connecting portion and the carrier substrate have rounded corners or chamfers.

[0024] Optionally, a temperature regulating component is provided on the side of the support substrate facing the base.

[0025] Optionally, multiple temperature control components are provided, and each temperature control component is connected to an independent control module.

[0026] This invention provides an electro-pulse-assisted 3D printing device for forming titanium-aluminum alloys. It provides high-frequency pulsed current through a high-frequency pulsed current generator. The high-frequency pulsed current can influence the titanium-aluminum alloy workpiece through electroplastic and electromagnetic effects, achieving a skin effect on the 3D-printed workpiece. The current is concentrated on the surface layer of the workpiece, with the high-frequency pulsed current concentrated in a thin layer on the outer surface. The closer to the surface, the greater the current density; the current inside the workpiece is actually smaller. This achieves in-situ pulsed electrical stimulation during the printing process. When the pulsed current passes through the workpiece, it generates a large number of directionally drifting free electrons (electron wind). Frequent, directional collisions of drifting electrons with dislocations generate an electron wind similar to applied stress on the dislocation segments, promoting the movement of dislocations on their slip surfaces. Electrical energy, thermal energy, and stress are instantaneously input into the material. The random thermal motion of atoms, under the instantaneous impact force of the pulsed current, gains sufficient kinetic energy to leave their equilibrium positions. The diffusion ability of atoms is enhanced, and dislocations are more likely to slip and climb, which helps eliminate cracks and structural defects in titanium-aluminum alloy workpieces, resulting in better performance. In this invention, the printing substrate has a structure that is thicker in the middle and thinner at both ends. The thickened design in the middle region of the printing substrate helps to reduce the current density in this area, reduce Joule heating during the printing process, and lower the temperature in the middle region. The local thermal field control of the ceramic base, combined with pulsed current assistance, effectively reduces residual stress in the molten pool, promotes the suppression of macro- and micro-cracks in the titanium-aluminum alloy workpiece, and improves the mechanical properties of the titanium-aluminum alloy workpiece. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a top view of the base in an electro-pulse assisted 3D printing device for forming titanium-aluminum alloys, provided by an embodiment of this utility model.

[0029] Figure 2 This is a cross-sectional view of the base in an electropulse-assisted 3D printing device for forming titanium-aluminum alloys, provided by an embodiment of this utility model.

[0030] Figure 3 This is a schematic cross-sectional view of the base, first electrode, second electrode, and printing substrate in an electro-pulse assisted 3D printing device for forming titanium-aluminum alloys, provided by an embodiment of this utility model.

[0031] Figure 4 This is a planar schematic diagram of a printing substrate (first embodiment) in an electric pulse-assisted 3D printing device for forming titanium-aluminum alloys, provided by an embodiment of the present invention.

[0032] Figure 5 This is a planar schematic diagram of a printing substrate (second embodiment) in an electric pulse-assisted 3D printing device for forming titanium-aluminum alloys, provided by an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the temperature distribution of a printing substrate (first embodiment) in an electro-pulse assisted 3D printing device for titanium-aluminum alloy forming, provided by an embodiment of this utility model.

[0034] Figure 7 This is a schematic diagram of the temperature distribution of a printing substrate (second embodiment) in an electro-pulse assisted 3D printing device for forming titanium-aluminum alloys, provided by an embodiment of this utility model. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0036] It should be noted that the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to direct setup or connection, or indirect setup or connection through centered components or centered structures.

[0037] Furthermore, in embodiments of this utility model, terms such as "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, or in a conventional placement or usage state. These terms are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure, feature, device, or element referred to must have a specific orientation or positional relationship, nor that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0038] The various specific technical features and embodiments described in the detailed embodiments can be combined in any suitable manner without contradiction. For example, different implementation methods can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the various specific technical features / embodiments in this utility model will not be described separately.

[0039] like Figures 1 to 4 As shown in the figure, an embodiment of the present invention provides an electro-pulse assisted 3D printing device for forming titanium-aluminum alloys, including a printing device body (not shown in the figure). The printing device body has an insulating base 100 and a conductive printing substrate 300. The base 100 is connected to a first electrode 210 and a second electrode 220 for electrical connection with a high-frequency pulse current generating device. The printing substrate 300 has a support substrate 330 for supporting titanium-aluminum alloy workpieces. The printing substrate 300 also has a first connecting portion 310 and a second connecting portion 320. The first connecting portion 310 and the second connecting portion 320 are respectively disposed at opposite ends of the support substrate 330 along a first direction (which may be the length direction). The first connecting portion 310 is connected to and electrically connected to the first electrode 210, and the first connecting portion 310 is connected to and electrically connected to the second electrode 220. The dimension of the support substrate 330 along a second direction (which may be the width direction) is larger than the dimensions of the first connecting portion 310 and the second connecting portion 320, so that the printing substrate 300 has a structure that is thicker in the middle and thinner at both ends.

[0040] In this embodiment, the insulating base 100 can be a ceramic base 100, and the 3D printing device can be used to form titanium-aluminum alloy workpieces. A high-frequency pulsed current is provided by a high-frequency pulsed current generator. The high-frequency pulsed current can affect the titanium-aluminum alloy workpiece through electroplastic and electromagnetic effects, achieving a skin effect on the 3D-printed workpiece. The current is concentrated on the surface layer of the workpiece, with the high-frequency pulsed current concentrated in a thin layer on the outer surface. The closer to the surface of the workpiece, the greater the current density. The current inside the workpiece is actually smaller, achieving in-situ pulsed electrical stimulation during the printing process. When the pulsed current passes through the workpiece, it generates a large number of directionally drifting free electrons (electron wind). Frequent, directional collisions of drifting electrons with dislocations generate an electron wind similar to applied stress on the dislocation segments, promoting the movement of dislocations on their slip surfaces. Electrical energy, thermal energy, and stress are instantaneously input into the material. The random thermal motion of atoms gains sufficient kinetic energy to leave their equilibrium positions under the instantaneous impact force of the pulsed current, enhancing the diffusion ability of atoms and making dislocations easier to slip and climb. This helps to eliminate cracks and structural defects in titanium-aluminum alloy workpieces, resulting in better performance of the titanium-aluminum alloy workpieces.

[0041] Specifically, by leveraging the rapid thermal conductivity of ceramic materials and combining it with the skin effect of pulsed current (which can act on the surface of the current printed layer of the titanium-aluminum alloy workpiece), this embodiment avoids the problems of high energy consumption and uneven microstructure caused by high-temperature preheating of the entire substrate in traditional technologies. In this embodiment, the printing substrate 300 has a structure that is thicker in the middle and thinner at both ends. The thickened design of the middle region of the printing substrate 300 helps to reduce the current density in this region, reduce Joule heating during the printing process, and lower the temperature in the middle region. The local thermal field regulation of the ceramic base 100, combined with the assistance of pulsed current, effectively reduces the residual stress in the molten pool, promotes the suppression of macro- and micro-cracks in the titanium-aluminum alloy workpiece, and can improve the mechanical properties of the titanium-aluminum alloy workpiece.

[0042] Moreover, in this embodiment, the ceramic base 100 and the in-situ electric pulse assistance scheme can achieve preheating-free, low-energy consumption, low-power, crack-free, and high-precision forming. It only requires adaptation to existing SLM equipment, which has significant cost advantages and is conducive to promotion and application.

[0043] In a specific application, the base 100 is provided with a first heat dissipation device (not shown in the figure). The first heat dissipation device can be a cooling fan, which can be connected to a controller and can be activated when needed. Of course, the first heat dissipation device may not be provided.

[0044] In specific applications, at least one side of the base 100 is provided with a second heat dissipation device (not shown in the figure). The second heat dissipation device may be a cooling fan, which may be connected to a controller. When needed, the second heat dissipation device can be activated to dissipate heat from the base 100. Of course, the second heat dissipation device may not be provided.

[0045] In specific applications, the base 100 is provided with a groove 103, and the carrier substrate 330 of the printing substrate 300 is located above the groove 103. The carrier substrate 330 does not need to directly contact the base 100, that is, the carrier substrate 330 and the base 100 have a certain distance between them. If the carrier substrate 330 directly contacts the ceramic base 100, its heat conduction rate is too fast, which can easily lead to uneven temperature of the carrier substrate 330. In this embodiment, the carrier substrate 330 does not contact the base 100, which is beneficial to the temperature stability of the carrier substrate 330.

[0046] In a specific application, the base 100 has a first mounting hole 101 and a second mounting hole 102, which are spaced apart. The first electrode 210 is columnar and disposed in the first mounting hole 101, and the second electrode 220 is columnar and adapted to be installed in the second mounting hole 102. The two ends of the groove 103 are respectively connected to the first mounting hole 101 and the second mounting hole 102. The first mounting hole 101 and the second mounting hole 102 can be circular through holes. The first electrode 210 and the second electrode 220 can be cylindrical, with their upper ends used to connect to the first connecting portion 310 and the second connecting portion 320 of the printing substrate 300. The other ends of the first electrode 210 and the second electrode 220 are used to connect to the cable of the high-frequency pulse current generator. In a specific application, the high-frequency pulse current generator can be equipped with a current regulating device and a pulse regulating device.

[0047] Specifically, the first electrode 210 has a first threaded hole at its end, and the second electrode 220 has a second threaded hole at its end. The first connecting part 310 has a first through hole, and the second connecting part 320 has a second through hole. The first connecting part 310 is fixed to the first electrode 210 by a first locking member threaded to the first threaded hole, and the second connecting part 320 is fixed to the second electrode 220 by a second locking member threaded to the second threaded hole. The first locking member and the second locking member can be bolts.

[0048] Specifically, the printing substrate 300 is a metal substrate, and the front side of the printing substrate 300 is flat, while the back side of the printing substrate 300 is provided with an anti-deformation structure. The anti-deformation structure may be a reinforcing rib on the back side, etc., to prevent the printing substrate 300 from deforming to a certain extent. Of course, this anti-deformation structure may not be provided.

[0049] Specifically, the printing substrate 300 is elliptical (e.g., Figure 5 As shown, the corresponding temperature distribution diagram is as follows: Figure 7 As shown, the temperature distribution at 330 on the substrate is uniform.

[0050] Alternatively, the carrier substrate 330 may be rectangular (e.g., Figure 4 As shown, the corresponding temperature distribution diagram is as follows: Figure 6 As shown, the temperature distribution at the substrate 330 is uniform. The first connecting part 310 and the second connecting part 320 are rectangular and integrally connected to the opposite ends of the substrate 330. The first connecting part 310 and the substrate 330, and the second connecting part 320 and the substrate 330 have rounded corners or chamfers. In specific applications, the shape of the printing substrate 300 can be set according to the actual situation.

[0051] In this embodiment, the shape design of the substrate 330 can facilitate current density control. The thickened design in the middle reduces the current density in this area, reduces Joule heating during the printing process, and lowers the temperature in the middle area. Moreover, it is beneficial to optimize heat conduction. The structure at both ends reduces the contact area with the ceramic base 100 / electrode (the contact area is reduced by 50% to 70%), which can suppress the rapid dissipation of heat to the base 100 to a certain extent, thereby balancing the overall temperature field.

[0052] In this embodiment, the high-frequency pulsed current flows through the carrier substrate 330 and the formed workpiece along the first direction. Alternatively, the carrier substrate 330 may be connected to another set of electrodes in the second direction, meaning the high-frequency pulsed current can also flow through the carrier substrate 330 and the formed workpiece along the second direction. This can be adjusted and switched as needed to suit different application scenarios.

[0053] Specifically, a temperature regulating component is provided on the side of the carrier substrate 330 facing the base 100. The temperature regulating component can be a semiconductor temperature regulating device, which has a first end and a second end opposite to each other. When a forward current is applied, its first end can cool down to lower the temperature of the carrier substrate 330. When a reverse current is applied, its first end can heat up to raise the temperature of the carrier substrate 330. The temperature of the carrier substrate 330 can be controlled by controlling the temperature regulating component. Of course, this temperature regulating component may not be provided.

[0054] Specifically, multiple temperature-regulating components are provided, and each temperature-regulating component is connected to an independent control module, which can independently control the temperature of different zones. Of course, the temperature-regulating components and control modules can also be omitted.

[0055] In practical applications, the optimal parameter range is determined through experimental verification (as shown in Table 1) to ensure that the solidification rate of the titanium-aluminum alloy molten pool and the thermal stress distribution are in balance.

[0056] The energy density is calculated using formula 1.

[0057]

[0058] P is the laser power (W), v is the scanning speed (mm / s), h is the scanning spacing (mm), l is the scanning layer thickness (mm), and Ev is the volume energy density (J / mm²). 3 ).

[0059] That is, Ev = P / (h*v*l). By dividing the laser power as the dividend by the product of the scanning speed (v), the scanning distance (h), and the scanning layer thickness (l), the volume energy density (Ev) can be obtained.

[0060] Table 1. Process parameters for electro-pulse assisted 3D printing of titanium-aluminum alloy

[0061]

[0062] In this embodiment, the laser power (P) is 75 to 275W. If the power is too low, the molten pool energy will be insufficient, which will easily cause cracking; if the power is too high, it will cause over-melting, resulting in element burn-off.

[0063] Scanning speed (v): 100 to 1100 mm / s. Too fast a speed will cause the molten pool to be discontinuous and have irregular pores; too slow a speed will aggravate heat accumulation and result in a larger keyhole.

[0064] The scanning spacing (h) and scanning layer thickness (l) are controlled at 0.065 to 0.1 mm and 0.03 to 0.05 mm, respectively, to balance energy input and forming density.

[0065] Process window expansion: Through parameter combination optimization, such as P = 300W, v = 1000mm / s, h = 0.1mm, l = 0.03mm, Ev = 100J / mm³, or P = 120W, v = 600mm / s, h = 0.075mm, l = 0.03mm, Ev = 88.89J / mm³. 3 At the same time, maintain the volume energy density range of 80–150 J / mm². 3 This significantly improves the process tolerance.

[0066] Specifically, when the process parameters are P=250W, v=1100mm / s, h=0.07mm, and l=0.03mm, the density exceeds 99.98% as detected by micro-focus computed tomography (micro-CT); when the process parameters are P=125W, v=300mm / s, h=0.1mm, and l=0.05mm, the density exceeds 99.97% as detected by micro-focus computed tomography (micro-CT).

[0067] In this embodiment, the base 100 is connected to a second electrode 220 for electrical connection with a first electrode 210 and a high-frequency pulse current generating device. The printing substrate 300 is mounted on the base 100. The printing substrate 300 has a carrier substrate 330 for supporting titanium-aluminum alloy workpieces. The printing substrate 300 also has a first connecting portion 310 and a second connecting portion 320. The first connecting portion 310 and the second connecting portion 320 are respectively located at opposite ends of the carrier substrate 330 along a first direction. The first connecting portion 310 is connected to and electrically conductive with the first electrode 210, and the first connecting portion 310 is connected to and electrically conductive with the second electrode 220. The dimension of the carrier substrate 330 along a second direction is larger than the dimensions of the first connecting portion 310 and the second connecting portion 320, making the printing substrate 300 have a structure that is thicker in the middle and thinner at both ends. This helps to solve the core problems of easy cracking and poor density in traditional titanium-aluminum alloy additive manufacturing. The local thermal field control of the ceramic base 100, combined with pulse current assistance, effectively reduces the residual stress in the molten pool and promotes the suppression of macro and micro cracks. Experiments show that the density of the molded parts is ≥99.97%, and there are no macro or micro cracks (as shown in all parameter combinations in Table 1). Compared to traditional SLM technology (which relies on high-temperature preheating of the substrate (800 to 1200°C), resulting in cracks in the formed parts and high equipment energy consumption), the cracking problem of titanium-aluminum alloys is fundamentally suppressed, porosity is reduced, ultimate tensile (compressive) strength is significantly improved, and elongation at break is greatly increased. For example, the ultimate tensile strength at 650°C is 582 MPa, and it has obtained MA and CNAS certifications; the ultimate tensile strength at 850°C is 688 MPa, with an elongation at break of 8.12%; the ultimate tensile strength at 900°C is 484 MPa, with an elongation at break of 18.96%; the ultimate tensile strength at 950°C is 306 MPa, with an elongation at break of 35.07%; the ultimate tensile strength at 1000°C is 171 MPa, with an elongation at break of 122.96%; the ultimate compressive strength at 25°C is 2450 MPa, with an elongation at break of 10.68%; and the ultimate compressive strength at 850°C is 950 MPa, with an elongation at break greater than 30%. In terms of process stability and energy efficiency, eliminating the need for overall preheating of the high-temperature substrate reduces energy consumption and extends equipment lifespan. Therefore, in this embodiment, by using the ceramic base 100 and in-situ electrical pulse assistance, preheating-free, low-energy, low-power, crack-free, and high-precision forming is achieved, requiring only adaptation to existing SLM equipment, thus possessing significant cost advantages.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electropulse-assisted 3D printing device for forming titanium-aluminum alloys, characterized in that, The device includes a printing device body, which has a base and a conductive printing substrate. The base is connected to a first electrode and a second electrode for electrical connection with a high-frequency pulse current generating device. The printing substrate has a carrier substrate for supporting titanium-aluminum alloy workpieces. The printing substrate also has a first connecting portion and a second connecting portion, which are located at opposite ends of the carrier substrate along a first direction. The first connecting portion is connected to and electrically conductive with the first electrode, and the first connecting portion is connected to and electrically conductive with the second electrode. The dimension of the carrier substrate along the second direction is larger than the dimensions of the first connecting portion and the second connecting portion, so that the printing substrate has a structure that is thick in the middle and thin at both ends.

2. The electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in claim 1, characterized in that, The base is a ceramic base.

3. The electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in claim 1, characterized in that, The base is provided with a first heat dissipation device inside; and / or, the base is provided with a second heat dissipation device on at least one side.

4. The electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in claim 1, characterized in that, The base is provided with a groove, and the carrier substrate of the printed substrate is located above the groove.

5. The electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in claim 4, characterized in that, The base has a first mounting hole and a second mounting hole, which are spaced apart. The first electrode is columnar and is disposed in the first mounting hole, and the second electrode is columnar and is adapted to be installed in the second mounting hole. The two ends of the groove are respectively connected to the first mounting hole and the second mounting hole.

6. An electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in any one of claims 1 to 5, characterized in that, The first electrode has a first threaded hole at its end, and the second electrode has a second threaded hole at its end. The first connecting part has a first through hole, and the second connecting part has a second through hole. The first connecting part is fixed to the first electrode by a first locking member that is threaded to the first threaded hole, and the second connecting part is fixed to the second electrode by a second locking member that is threaded to the second threaded hole.

7. An electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in any one of claims 1 to 5, characterized in that, The printing substrate is a metal substrate, and the front side of the printing substrate is flat, while the back side of the printing substrate is provided with an anti-deformation structure.

8. An electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in any one of claims 1 to 5, characterized in that, The printing substrate is elliptical. Alternatively, the carrier substrate is rectangular, the first connecting portion and the second connecting portion are rectangular and integrally connected to opposite ends of the carrier substrate, and the first connecting portion and the carrier substrate, and the second connecting portion and the carrier substrate have rounded corners or chamfers.

9. An electropulse-assisted 3D printing device for forming titanium-aluminum alloys as described in any one of claims 1 to 5, characterized in that, A temperature regulating component is provided on the side of the support substrate facing the base.

10. An electro-pulse assisted 3D printing device for forming titanium-aluminum alloys as described in claim 9, characterized in that, The temperature control components are provided in multiple ways, and each temperature control component is connected to an independent control module.

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