A 3D printing device for amorphous thin strips based on high-frequency pulse power supply

Abstract

This invention discloses an amorphous ribbon 3D printing device based on a high-frequency pulsed power supply. An amorphous ribbon conveying mechanism is used to transport the amorphous ribbon onto a substrate. A print head mechanism is located above the substrate, and the print head mechanism and the substrate are capable of relative movement. The first and second poles of the high-frequency pulsed power supply are electrically connected to the print head mechanism and the substrate, respectively, wherein the first pole is positive and the second pole is negative, or vice versa. Both the high-frequency pulsed power supply and a pressure sensor are connected to a control system. The pressure sensor is mounted on the print head mechanism and is used to collect the contact pressure between the print head mechanism and the amorphous ribbon on the substrate. The control system controls the output pulse current of the high-frequency pulsed power supply according to the relationship between the contact pressure and a preset pulse current trigger pressure threshold. This invention solves the problems of complex systems, high energy consumption, and strict manufacturing environment requirements in existing amorphous alloy parts manufacturing processes.

Description

Technical Field

[0001] The invention relates to the field of metal additive manufacturing, and in particular to an amorphous thin strip 3D printing device based on a high-frequency pulse power supply. Background Art

[0002] Additive Manufacturing (AM), commonly known as 3D printing, integrates computer-aided design, material processing and molding technology, and is based on digital model files. It uses software and CNC systems to stack special metal materials, non-metallic materials and medical biomaterials layer by layer in the form of extrusion, sintering, melting, light curing, spraying, etc. to produce physical objects. Compared with the traditional processing mode of removing raw materials, cutting and assembling, it is a "bottom-up" manufacturing method through material accumulation, from scratch. This makes it possible to manufacture complex structural parts that were previously constrained by traditional manufacturing methods and could not be achieved.

[0003] Amorphous alloys have excellent mechanical properties such as high strength, high wear resistance, and high elasticity. However, compared with general metal materials, amorphous alloys are difficult to form. The preparation principle of amorphous alloys is ultra-rapid solidification. When the alloy solidifies, the atoms do not have time to arrange in order and crystallize. The resulting solid alloy is a long-range disordered structure. The molecules (or atoms, ions) that make up its substance do not have regular spatial periodicity, and there are no grains or grain boundaries of crystalline alloys. Due to its unique structural characteristics, amorphous alloys exhibit excellent properties that are difficult to match with some conventional metal materials. At the same time, they also have the characteristics of inheritance, memory, soft magnetism, and large magnetic entropy. In addition to its excellent armor-piercing performance, precision net forming processing and excellent corrosion resistance, it is considered to be a new generation of metal materials with important application prospects in military weapons, aerospace, biomedicine, electronic equipment, and sports.

[0004] However, it is well known that most amorphous alloys become brittle due to crystallization, structural relaxation or heat-induced phase separation. At the same time, amorphous alloys are easily oxidized, which not only leads to embrittlement but also increases the critical cooling rate required for glass formation. Therefore, it is difficult to connect amorphous alloys by traditional fusion processes even in the presence of inert gases. At present, the main methods for preparing amorphous alloy parts are thermoplastic forming, powder sintering, welding assembly and additive manufacturing. Thermoplastic forming (such as molding, blow molding, etc.) is difficult to manufacture large-sized parts with complex shapes; although the latter three methods have broken through the size limitation problem, the powder sintering method requires molds and sintering furnaces, and the forming process is relatively cumbersome; the performance difference between the welding part and the substrate during welding assembly limits the application range of the parts; in the process of additive manufacturing (such as amorphous powder selective laser melting), high-energy beam additive manufacturing methods represented by lasers have problems such as high equipment cost, complex equipment, relatively large volume, radiation pollution, and slow forming speed at the same power. Therefore, new low-cost and efficient forming methods for large-sized complex parts of amorphous alloys are particularly important.

[0005] For example, patent document CN109465442A discloses a forging / additive composite manufacturing method for amorphous alloy parts and specifically discloses that amorphous alloy powder materials are made into pre-forged blanks by using powder sintering technology, and then the pre-forged blanks are placed in a closed forging die for closed hot die forging to obtain the main structure of the amorphous alloy parts. Finally, the energy field-assisted additive manufacturing technology is used to process the fine structures with relatively small local sizes, or some structures that cannot be formed by forging, such as thin-walled ribs, hollow shells, conformal cooling channels, etc. Correspondingly, a forging / additive composite manufacturing method for large-sized and complex amorphous alloy parts is obtained, especially the interface connection performance between the main structure of the amorphous alloy and the local fine structure is strengthened and improved. However, the amorphous alloy forming process disclosed in the patent is relatively complicated, and the cost of amorphous alloy is relatively high, the device occupies a large volume space, and the system cost is high. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an amorphous thin strip 3D printing device based on a high-frequency pulse power supply, which aims to solve the problems existing in the existing amorphous alloy parts manufacturing, such as complex system, large equipment space, high energy consumption, and strict manufacturing environment requirements.

[0007] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0008] A 3D printing device for an amorphous thin strip based on a high-frequency pulse power supply comprises a high-frequency pulse power supply, a print head mechanism, a pressure sensor, a substrate, a control system and an amorphous thin strip conveying mechanism, wherein the amorphous thin strip conveying mechanism is used to convey the amorphous thin strip onto the substrate; the print head mechanism is located above the substrate, and the print head mechanism and the substrate can move relative to each other; a first pole and a second pole of the high-frequency pulse power supply are electrically connected to the print head mechanism and the substrate respectively, wherein the first pole is a positive pole and the second pole is a negative pole, or the first pole is a negative pole and the second pole is a positive pole; the high-frequency pulse power supply and the pressure sensor are both connected to the control system; the pressure sensor is arranged on the print head mechanism, and the pressure sensor is used to collect the contact pressure between the print head mechanism and the amorphous thin strip on the substrate; the control system is used to control the high-frequency pulse power supply to output a pulse current according to the relationship between the contact pressure and a preset pulse current trigger pressure threshold.

[0009] Furthermore, the amorphous thin strip conveying mechanism includes an amorphous thin strip winding disk, a tensioning wheel mechanism, an idler wheel, a driving wheel, a driven wheel and a thin strip guiding mechanism, the cylindrical surfaces of the driving wheel and the driven wheel are close to each other to form a gap for the amorphous thin strip to pass through, and the thin strip guiding mechanism is arranged at a position close to the upper end surface of the substrate, and one end of the amorphous thin strip on the amorphous thin strip winding disk is wound around the tensioning wheel mechanism and the idler wheel in turn, and then passes through the gap formed by the driving wheel and the driven wheel and the thin strip guiding mechanism in turn.

[0010] Furthermore, the amorphous thin strip conveying mechanism also includes a shearing mechanism, and the shearing mechanism is arranged at an exit position of the thin strip guiding mechanism.

[0011] Furthermore, it also includes a lifting mechanism and a moving platform, the lifting mechanism is located above the moving platform, the lifting mechanism and the moving platform are both connected to the control system, the print head mechanism is arranged on the lifting mechanism, and the substrate is arranged on the moving platform.

[0012] Furthermore, an insulating plate is provided between the base plate and the moving platform.

[0013] Furthermore, the print head mechanism includes a sleeve, a print head, a fastening gasket, a pressure cover and connecting bolts, the end of the print head away from the substrate extends into the sleeve, the pressure sensor is located in the sleeve and contacts with the end of the print head away from the substrate, the fastening gasket is connected to the lower end of the sleeve by the connecting bolts to fix the print head, and the pressure cover is connected to the upper end of the sleeve by the connecting bolts to fix the pressure sensor.

[0014] Furthermore, an elastic buffer mechanism is provided between one end of the print head and the pressure sensor.

[0015] The elastic buffer mechanism includes a slideway opened downward along one end of the print head, a T-shaped slider slidably arranged in the slideway, and an elastic member sleeved on the T-shaped slider, the upper end surface of the T-shaped slider is in contact with the pressure sensor, one end of the elastic member abuts against one end of the print head, and the other end abuts against the T-shaped slider.

[0016] Furthermore, one end of the print head close to the substrate is in a pointed shape, a flat shape or a ball head shape.

[0017] Furthermore, the high-frequency pulse power input adopts AC 220V±10%, the input frequency is 50Hz±10%; and the output pulse frequency is hundreds of hertz to megahertz.

[0018] Furthermore, the high-frequency pulse power supply adopts an intermittent pulse output mode.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The present invention provides an amorphous ribbon 3D printing device based on a high-frequency pulse power supply, which realizes the welding effect of the amorphous ribbon based on the fact that the device uses the current to generate heat when it is powered on. Specifically, the amorphous ribbon is delivered to the substrate through the amorphous ribbon conveying mechanism, and then the print head mechanism and the substrate are respectively connected to the positive and negative poles of the high-frequency pulse power supply, so that the print head mechanism, the substrate and the high-frequency pulse power supply form a loop. When the print head mechanism applies pressure to the amorphous ribbon on the substrate to a certain value, the contact pressure collected by the pressure sensor is used as a trigger signal for the high-frequency pulse power supply to output a pulse current. When the contact pressure is greater than the preset pulse current trigger pressure threshold, the control system controls the high-frequency pulse power supply to output a pulse current. In other words, the control system causes the high-frequency pulse power supply to output a waveform current to instantly weld the amorphous ribbon between the print head mechanism and the substrate together. The present invention is based on an amorphous thin strip 3D printing system using a high-frequency pulse power supply as a heat source, which can realize the welding of amorphous thin strips by using the instantaneous heating ability of high-frequency pulse current. Because the welding process is very short, the heating time and cooling time are extremely fast, which solves the problem of heat accumulation in amorphous thin strip 3D printing, and alleviates the problems of cracking, warping, deformation, etc. of amorphous thin strips caused by thermal stress caused by excessive temperature gradient during printing. At the same time, the present invention does not require substrate heating, and the high-frequency pulse power supply is the only heat source for amorphous thin strip 3D printing, which needs to be designed and implemented according to the type of amorphous thin strip and the specific welding process requirements. The high-frequency pulse power supply is lower in cost than lasers and has a simple overall structure. When using a laser to print metal materials, it is inevitable that laser energy will be lost, and the reflectivity can reach 60-98%, and the reflectivity changes with the surface temperature, which is especially important for thin strip welding. If a high-frequency pulse power supply is used as a heat source to melt and weld amorphous thin strips, the energy utilization rate is much higher than that of a laser, and the output energy can be basically used to generate heat to melt the amorphous thin strip. The invention has the characteristics of low power consumption, low cost, miniaturization and easy automation.

[0021] Furthermore, the material used in the present invention is an ultra-thin amorphous strip, so it is easy to get wire blocked, which places high demands on delivery accuracy. The amorphous strip conveying mechanism of the present invention delivers the amorphous strip to the substrate by utilizing the coaxiality and verticality between the two wheels under the joint action of the strip feeding driving wheel and the driven wheel.

[0022] Furthermore, the amorphous thin strip conveying mechanism also includes a shearing mechanism, which is arranged at the exit position of the thin strip guiding mechanism to facilitate shearing of the amorphous thin strip and control of the delivery length.

[0023] Furthermore, the lifting mechanism can accurately detect the pressure applied by the print head to the amorphous ribbon by cooperating with the pressure sensor in the print head mechanism, and then feedback to the control system and the high-frequency pulse power supply through the rapid hammering pressure real-time detection feedback system, which is used as a pulse power supply output trigger signal. When it is detected that the print head and the amorphous ribbon generate a certain pressure, the pulse power supply outputs a pulse current. The cooperation with the high-frequency pulse power supply can realize rapid hammering printing, and a pulse current is triggered to flow at each contact, ensuring the welding of the amorphous ribbon, while obtaining a faster heating speed and energy utilization rate.

[0024] Furthermore, an insulating plate is provided between the substrate and the moving platform to prevent the substrate from forming a loop with the print head mechanism from other places through the moving platform. The insulating plate allows current to flow through the contact portion between the print head mechanism and the substrate.

[0025] Furthermore, one end of the print head close to the substrate is in a pointed shape, a flat shape or a ball head shape so as to meet the printing requirements of different processes.

[0026] Furthermore, the high-frequency pulse power supply adopts an intermittent pulse output mode, and the output response time of the intermittent pulse is extremely short.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of an amorphous thin strip 3D printing device based on a high-frequency pulse power supply according to the present invention;

[0030] Figure 2 In the figure, (a) is a schematic front view of the hard contact type pointed print head mechanism of the present invention; (b) is a schematic cross-sectional view of the hard contact type pointed print head mechanism of the present invention;

[0031] Figure 3 In the figure, (a) is a schematic front view of a hard contact type flat head printing head mechanism of the present invention; (b) is a schematic cross-sectional view of a hard contact type flat head printing head mechanism of the present invention;

[0032] Figure 4In the figure, (a) is a schematic front view of a hard contact type ball head printing head mechanism of the present invention; (b) is a schematic cross-sectional view of a hard contact type ball head printing head mechanism of the present invention;

[0033] Figure 5 In the figure, (a) is a front view schematic diagram of a hard contact type pointed print head mechanism with a buffer structure of the present invention; (b) is a cross-sectional view schematic diagram of a hard contact type pointed print head mechanism with a buffer structure of the present invention;

[0034] Figure 6 In the figure, (a) is a front view schematic diagram of a hard contact type flat head printing head mechanism with a buffer structure of the present invention; (b) is a cross-sectional view schematic diagram of a hard contact type flat head printing head mechanism with a buffer structure of the present invention;

[0035] Figure 7 In the figure, (a) is a schematic front view of a hard contact type ball head printing head mechanism with a buffer structure of the present invention; (b) is a schematic cross-sectional view of a hard contact type ball head printing head mechanism with a buffer structure of the present invention;

[0036] Figure 8 It is a schematic diagram of the amorphous thin strip conveying mechanism of the present invention.

[0037] In the figure: 1-high frequency pulse power supply; 2-print head mechanism; 201-sleeve; 202-print head; 203-fastening gasket; 204-pressure cover; 205-connecting bolt; 206-elastic buffer mechanism; 207-slide; 208-T-shaped slider; 209-elastic member; 3-pressure sensor; 4-substrate; 5-control system; 6-amorphous thin strip conveying mechanism; 601-amorphous thin strip winding disk; 602-tensioning wheel mechanism; 603-idle wheel; 604-driving wheel; 605-driven wheel; 606-thin strip guiding mechanism; 607-cutting mechanism; 7-lifting mechanism; 8-movement platform; 9-insulating plate; 10-base; 11-mounting frame. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] As a specific embodiment of the present invention, Figure 1As shown, an amorphous ribbon 3D printing device based on a high-frequency pulse power supply includes a high-frequency pulse power supply 1, a print head mechanism 2, a pressure sensor 3, a substrate 4, a control system 5 and an amorphous ribbon conveying mechanism 6, and the amorphous ribbon conveying mechanism 6 is used to convey the amorphous ribbon to the substrate 4. The print head mechanism 2 is located above the substrate 4, and the print head mechanism 2 and the substrate 4 can move relative to each other. Specifically, the print head mechanism 2 can move up and down relative to the substrate 4, and the substrate 4 can move forward, backward, left and right relative to the print head mechanism 2. In this embodiment, the printing device also includes a lifting mechanism 7 and a moving platform 8. The lifting mechanism 7 is located above the moving platform 8. The lifting mechanism 7 and the moving platform 8 are both connected to the control system 5. The print head mechanism 2 is arranged on the lifting mechanism 7, and the substrate 4 is arranged on the moving platform 8. The lifting mechanism 7 and the moving platform 8 are controlled by the control system 5 to perform corresponding movements. Preferably, an insulating plate 9 is arranged between the substrate 4 and the moving platform 8.

[0040] The first pole and the second pole of the high-frequency pulse power supply 1 are electrically connected to the print head mechanism 2 and the substrate 4, respectively, wherein the first pole is a positive pole and the second pole is a negative pole, or the first pole is a negative pole and the second pole is a positive pole. The high-frequency pulse power supply 1 and the pressure sensor 3 are both connected to the control system 5. The pressure sensor 3 is arranged on the print head mechanism 2, and the pressure sensor 3 is used to collect the contact pressure between the print head mechanism 2 and the amorphous thin strip on the substrate 4, and the contact pressure collected by the pressure sensor 3 is used as a trigger signal for the high-frequency pulse power supply 1 to output a pulse current. The control system 5 is used to control the high-frequency pulse power supply 1 to output a pulse current according to the size relationship between the contact pressure and the preset pulse current trigger pressure threshold. Specifically, when the contact pressure is greater than the preset pulse current trigger pressure threshold, the control system 5 controls the high-frequency pulse power supply 1 to output a pulse current. In this embodiment, the control system 5 controls the high-frequency pulse power supply 1 to output a pulse current with adjustable size and span, welds the amorphous thin strips together, and then completes the 3D molding by the relative movement between the print head mechanism 2 and the substrate 4. The use of high-frequency pulse power ensures that only one pulse current is output each time a connection is made, and excessive output energy will not cause the amorphous thin strip to suffer from adverse effects such as welding through or cracks due to excessive energy received.

[0041] Preferably, the input of the high-frequency pulse power supply 1 adopts AC 220V±10%, and the input frequency is 50Hz±10%; the output pulse frequency can be adjusted in the range of hundreds of hertz to megahertz, and the output control mode is divided into voltage stabilization and current stabilization; the form of electric energy can be DC or AC, and the characteristic is low voltage and high current mode, which is matched according to the material to be printed and the process. The output voltage and current values ​​are continuously adjustable from zero to the rated value, and the constant voltage and constant current are automatically converted according to the load characteristics. The current and voltage can be set arbitrarily within the rated range. According to the process requirements, the output can meet the current value required for amorphous thin strip welding; the protection methods include short circuit protection, voltage limiting protection, current limiting protection, over-temperature protection and automatic phase loss protection, etc.; the output frequency can be adjusted in multiple output gears; the output pulse width is adjustable within a certain range. The high-frequency pulse power supply adopts an intermittent pulse output mode, and the output response time of the intermittent pulse is extremely short.

[0042] like Figure 8 As shown, specifically, the amorphous thin strip conveying mechanism 6 includes an amorphous thin strip winding disk 601, a tensioning wheel mechanism 602, an idler wheel 603, a driving wheel 604, a driven wheel 605 and a thin strip guiding mechanism 606. The cylindrical surfaces of the driving wheel 604 and the driven wheel 605 are close to each other to form a gap for the amorphous thin strip to pass through. The thin strip guiding mechanism 606 is arranged at a position close to the upper end surface of the substrate 4. One end of the amorphous thin strip on the amorphous thin strip winding disk 601 is wound around the tensioning wheel mechanism 602 and the idler wheel 603 in sequence, and then passes through the gap formed by the driving wheel 604 and the driven wheel 605 and the thin strip guiding mechanism 606 in sequence. Preferably, the amorphous thin strip conveying mechanism 6 also includes a shearing mechanism 607, which is arranged at the exit position of the thin strip guiding mechanism 606. The delivery length of the amorphous thin strip will be displayed in real time in the machine control system 5 so that its wire length can be controlled by the shearing mechanism 607.

[0043] The amorphous thin strip is fed into the system by the amorphous thin strip winding disk 601, and the tension of the amorphous thin strip is adjusted by the tensioning wheel mechanism 602, and then sent into the gap formed between the driving wheel 604 and the driven wheel 605 through the idler wheel 603. At the same time, the idler wheel 603 measures the feeding speed of the amorphous thin strip and feeds it back to the control system 5 for closed-loop control. The amorphous thin strip is then delivered to the guiding mechanism 606 through the gap formed between the driving wheel 604 and the driven wheel 605. The driving wheel 604 is responsible for providing power, and the driven wheel 605 is responsible for applying a certain pressure to prevent the amorphous thin strip from slipping and causing errors. The guiding mechanism 606 guides the amorphous thin strip to the specified position on the replaceable substrate 4, and detects the actual output length of the amorphous thin strip, and feeds it back to the control system 5 for closed-loop control. When the amorphous thin strip needs to be broken, it is cut using the shearing mechanism 607. The function of the driven wheel 605 is to deliver the amorphous ribbon without slipping. It is realized by a spring plus roller wheel to press the amorphous ribbon, and the spring clamp top screw can adjust the pressing force. The driving wheel 604 is coaxially connected to the motor as the main power source of the delivery system. The amorphous ribbon is delivered to the guide mechanism 606 under the pressure of the driven wheel 605 through friction. The guide mechanism 606 serves as a guiding device for the amorphous ribbon and delivers the amorphous ribbon to the substrate 4 to achieve electric pressure hammer printing.

[0044] Combination Figure 2 , Figure 3 and Figure 4 As shown, as a preferred embodiment of the present invention, the print head mechanism 2 includes a sleeve 201, a print head 202, a fastening gasket 203, a pressure cover 204 and a connecting bolt 205. The end of the print head 202 away from the substrate 4 extends into the sleeve 201, the pressure sensor 3 is located in the sleeve 201 and contacts with the end of the print head 202 away from the substrate 4. The fastening gasket 203 is connected to the lower end of the sleeve 201 by the connecting bolt 205 to fix the print head 202, and the pressure cover 204 is connected to the upper end of the sleeve 201 by the connecting bolt 205 to fix the pressure sensor 3.

[0045] Based on the above implementation, Figure 5 , Figure 6 and Figure 7 As shown, an elastic buffer mechanism 206 is further provided between one end of the print head 202 and the pressure sensor 3. Specifically, the elastic buffer mechanism 206 includes a slideway 207 downwardly opened along one end of the print head 202, a T-shaped slider 208 slidably provided in the slideway 207, and an elastic member 209 sleeved on the T-shaped slider 208, the upper end surface of the T-shaped slider 208 contacts the pressure sensor 3, one end of the elastic member 209 abuts against one end of the print head 202, and the other end abuts against the T-shaped slider 208. In this embodiment, the elastic member 209 is a spring.

[0046] like Figure 1As shown, the 3D printing device of the present invention is fixed by a mounting base 10 and a mounting frame 11 .

[0047] Combination Figures 2 to 7 As shown, according to different printing process requirements, the end of the print head 202 close to the substrate 4 can be designed to be pointed, flat or ball-shaped.

[0048] The principle of the present invention is based on the fact that the 3D printing device uses electric current to generate heat when it is powered on to achieve the welding effect of the amorphous thin strip. The amorphous thin strip is delivered to the substrate through the amorphous thin strip conveying mechanism, and then the print head mechanism and the substrate are respectively connected to the positive and negative poles of the high-frequency pulse power supply, so that the print head mechanism, the substrate and the high-frequency pulse power supply form a loop. When the print head mechanism applies pressure to the amorphous thin strip on the substrate to a certain value, the contact pressure collected by the pressure sensor is used as a trigger signal for the high-frequency pulse power supply to output a pulse current. When the contact pressure is greater than the preset pulse current trigger pressure threshold, the control system controls the high-frequency pulse power supply to output a pulse current, that is, the control system enables the high-frequency pulse power supply to output a waveform current to instantly weld the amorphous thin strip between the print head mechanism and the substrate together. Preferably, the present invention has an insulating plate between the substrate and the moving platform to prevent the substrate from forming a loop with the print head mechanism from other places through the moving platform, and the insulating plate allows the current to flow along the contact part between the print head mechanism and the substrate. The amorphous thin ribbon is continuously delivered to the substrate as the substrate moves under the delivery action of the amorphous thin ribbon conveying mechanism, and a shape of a certain scale can be formed on the substrate, such as a shape of a thin-walled hollow tube.

[0049] The lifting mechanism and the print head mechanism realize the pressure extrusion and welding of the amorphous thin strip. The pressure sensor inside the print head mechanism feeds back to the computer control system in real time the pressure value currently applied by the print head mechanism to the substrate so as to adjust the height of the lifting mechanism to realize the pressure control of the print head mechanism on the substrate. In this way, the pressure requirements of the amorphous thin strip material can be met and no crystallization is generated after welding. At the same time, because the pressure can be detected and adjusted, the welding of amorphous thin strips with different materials and different process requirements has a wider applicability.

[0050] The pressure sensor, computer control system and high-frequency pulse power supply inside the print head mechanism constitute a fast hammer pressure real-time detection feedback system, which makes up for the problem of the current output by the high-frequency pulse power supply and the coordination of the print head mechanism, and efficiently realizes the welding combination between the layers of the amorphous thin strip, and can independently set the hammer speed of the print head mechanism, so that the density of the welding can be independently determined, which is helpful to achieve high-density amorphous thin strip 3D molding. The print head position is connected to the circuit, and when the print head exerts a certain pressure on the substrate, it outputs current to achieve the welding effect. At the same time, the device is different from general 3D printing equipment. All printing processes need to be printed in a vacuum or argon environment. The device can decide whether to add an electrode atmosphere protection system according to different materials and process requirements, which greatly saves costs and improves the applicability of the equipment. At the same time, because the contact time between the print head and the substrate is extremely short, the high-frequency pulse power supply only outputs a waveform of current for one contact, which reduces the heat accumulation problem of the print head part, and thus reduces the deformation of the printed object, thereby improving the molding quality.

[0051] The motion platform system moves through a stepper motor, and its control part is controlled by a computer control system. Due to the particularity of the device, the motion platform system has excellent anti-impact and anti-vibration effects, and also has a current position self-locking function to prevent the Z axis from falling due to excessive hammer pressure during the printing process, affecting the printing effect, and has a high-precision positioning function with an accuracy of up to ±0.002mm.

[0052] The high-frequency pulse power supply serves as the heat input part of the device. The positive and negative electrodes of this part are connected to the print head mechanism and the substrate to form a loop to supply current to generate heat. The current output by the high-frequency pulse power supply can be adjusted according to different materials and different process requirements. As another embodiment, the pressure sensor is also connected to the high-frequency pulse power supply, and the pressure value detected by the pressure sensor is used as the current trigger signal. When the pressure value exceeds the preset trigger pressure threshold, the high-frequency pulse power supply emits a waveform current for welding. The trigger pressure threshold and the pulse width of the output current of the high-frequency pulse power supply are adjustable to meet different needs.

[0053] The device of the present invention also has the advantages that the pulse current, pulse width and output current trigger pressure value are adjustable. The adjustable output current trigger pressure value can meet the requirements for the output timing of the trigger current under different pressures.

[0054] The working steps of the amorphous thin strip 3D printing device based on high-frequency pulse power supply of the present invention are as follows:

[0055] 1. Use the supporting software to load the model, adjust the parameters and slice it. Model slicing is actually to translate the 3D model described by triangular facets into a G code instruction group that can be executed by the 3D printer through a specific algorithm, that is, to convert the 3D model in *.stl format into a G code that can be used by the 3D printer.

[0056] 2. Before printing begins, install the amorphous ribbon winding disk first, set the relevant motion platform parameters, and set the current output size and width of the high-frequency pulse power supply and the trigger pressure value.

[0057] 3. Start the motion system, level the platform, deliver the amorphous thin strip to the substrate, turn on the high-frequency pulse power switch and start printing. The amorphous thin strip materials are softened and bonded to each other through the high-frequency pulse current. Subsequently, the amorphous thin strips are further delivered for welding, accumulated layer by layer, and finally stacked into shape.

[0058] 4. During the printing process, the pressure sensor detects and feeds back the pressure between the print head and the substrate. At the same time, the Z-axis position needs to be changed each time a layer is added to keep the pressure of the print head on the substrate at a constant value.

[0059] 5. After printing is completed, the internal stress is eliminated according to the processing requirements of various materials. When printing is completed, the workpiece is removed.

[0060] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An amorphous thin strip 3D printing device based on a high-frequency pulse power supply, characterized in that: The invention comprises a high-frequency pulse power supply (1), a print head mechanism (2), a pressure sensor (3), a substrate (4), a control system (5) and an amorphous thin strip conveying mechanism (6), wherein the amorphous thin strip conveying mechanism (6) is used to convey the amorphous thin strip onto the substrate (4); the print head mechanism (2) is located above the substrate (4), and the print head mechanism (2) and the substrate (4) are capable of relative movement; a first pole and a second pole of the high-frequency pulse power supply (1) are respectively electrically connected to the print head mechanism (2) and the substrate (4), wherein the first pole is a positive pole and the second pole is a positive pole. The second electrode is a negative electrode, or the first electrode is a negative electrode and the second electrode is a positive electrode; the high-frequency pulse power supply (1) and the pressure sensor (3) are both connected to the control system (5); the pressure sensor (3) is arranged on the print head mechanism (2), and the pressure sensor (3) is used to collect the contact pressure between the print head mechanism (2) and the amorphous thin strip on the substrate (4); the control system (5) is used to control the high-frequency pulse power supply (1) to output a pulse current according to the relationship between the contact pressure and a preset pulse current trigger pressure threshold; The print head mechanism (2) comprises a sleeve (201), a print head (202), a fastening gasket (203), a pressure cover (204) and a connecting bolt (205); an end of the print head (202) away from the substrate (4) extends into the sleeve (201); the pressure sensor (3) is located in the sleeve (201) and contacts the end of the print head (202) away from the substrate (4); the fastening gasket (203) is connected to the lower end of the sleeve (201) via the connecting bolt (205) to fix the print head (202); and the pressure cover (204) is connected to the upper end of the sleeve (201) via the connecting bolt (205) to fix the pressure sensor (3); An elastic buffer mechanism (206) is also provided between one end of the print head (202) and the pressure sensor (3); The elastic buffer mechanism (206) comprises a slideway (207) opened downwardly along one end of the print head (202), a T-shaped slider (208) slidably arranged in the slideway (207), and an elastic member (209) sleeved on the T-shaped slider (208), the upper end surface of the T-shaped slider (208) being in contact with the pressure sensor (3), one end of the elastic member (209) being against one end of the print head (202), and the other end being against the T-shaped slider (208); One end of the printing head (202) close to the substrate (4) is in a pointed shape, a flat shape or a ball head shape; The high-frequency pulse power supply (1) adopts an input of AC 220V±10% and an input frequency of 50Hz±10%; the output pulse frequency is from 100Hz to MHz.

2. According to claim 1, an amorphous thin strip 3D printing device based on a high-frequency pulse power supply is characterized in that: The amorphous thin strip conveying mechanism (6) comprises an amorphous thin strip winding disk (601), a tensioning wheel mechanism (602), an idler wheel (603), a driving wheel (604), a driven wheel (605) and a thin strip guiding mechanism (606); the cylindrical surfaces of the driving wheel (604) and the driven wheel (605) are close to each other to form a gap for the amorphous thin strip to pass through; the thin strip guiding mechanism (606) is arranged at a position close to the upper end surface of the substrate (4); one end of the amorphous thin strip on the amorphous thin strip winding disk (601) is wound around the tensioning wheel mechanism (602) and the idler wheel (603) in sequence, and then passes through the gap formed by the driving wheel (604) and the driven wheel (605) and the thin strip guiding mechanism (606) in sequence.

3. The amorphous thin strip 3D printing device based on high-frequency pulse power supply according to claim 2 is characterized in that: The amorphous thin strip conveying mechanism (6) further comprises a shearing mechanism (607), wherein the shearing mechanism (607) is arranged at an exit position of the thin strip guiding mechanism (606).

4. The amorphous thin strip 3D printing device based on high-frequency pulse power supply according to claim 1 is characterized in that: The invention also comprises a lifting mechanism (7) and a moving platform (8), wherein the lifting mechanism (7) is located above the moving platform (8), and both the lifting mechanism (7) and the moving platform (8) are connected to the control system (5), the print head mechanism (2) is arranged on the lifting mechanism (7), and the substrate (4) is arranged on the moving platform (8).

5. The amorphous thin strip 3D printing device based on high-frequency pulse power supply according to claim 4 is characterized in that: An insulating plate (9) is provided between the base plate (4) and the moving platform (8).

6. The amorphous thin strip 3D printing device based on high-frequency pulse power supply according to claim 1, characterized in that: The high-frequency pulse power supply (1) adopts an intermittent pulse output mode.

Images