Method for removing support metal from cold spray deposition 3D printing

Abstract

The present invention relates to a method for removing support metal in cold spray deposition 3D printing, the method comprising the following steps: step 1 installing a workpiece and a balance block; step 2 heating and melting the support metal; step 3 removing the support metal by centrifugal force; the equipment comprises: a heating furnace, a rotating mechanism, a turntable mechanism and a control system; the heating furnace comprises a furnace frame, a furnace door, a heating element and a heat preservation material; the rotating mechanism comprises a reduction motor, a transmission shaft, a mounting sleeve and an end cover; the turntable mechanism comprises a turntable, a workpiece, a balance block, a receiving tray and four baffles; the control system comprises a controller, a temperature sensor and a vibration sensor. It has the advantages of removing the support metal by the centrifugal force generated by the rotation of the workpiece, high removal efficiency, and avoiding the problems of the existing method that it is difficult to completely remove the liquid support metal and the solid model metal due to the infiltration, and the problem of sagging, etc. For some workpieces with complex shapes, the effect is more obvious.

Description

Technical Field

[0001] The invention relates to a method for removing supporting metal by cold spray deposition 3D printing. Background Art

[0002] The metal cold spray deposition molding method originated from the cold spray technology (Cold Gas Dynamic Spray, CGDS), which is to directly or through the gas heater into the scaled Laval nozzle of high-pressure gas to form a supersonic airflow, thereby driving the powder particles (5-50μm) into the Laval nozzle at a low temperature (generally below 600℃), and then accelerated by the Laval nozzle to collide with the substrate at a very high speed (300-1200m / s), causing the particles to undergo strong plastic deformation, and their kinetic energy is converted into heat energy, thereby depositing on the substrate surface. Cold spray deposition molding has many advantages such as low particle temperature, particles always remain solid during the molding process, dense deposition layer, low porosity, and fast deposition speed.

[0003] Since both the substrate and the sprayed metal particles remain solid during the metal cold spray deposition molding process, the metal 3D printing technology based on cold spray deposition molding has a very important advantage, which is that it is easier to achieve deposition molding of more than two different metal materials, which is difficult to achieve with other metal 3D printing methods. By utilizing this feature, metals with higher melting points are used as model materials, and metals with lower melting points are used as support materials. After molding, the support materials are removed by heating, thereby achieving the printing and molding of complex workpieces and solving the problem of difficulty in removing support materials in the current metal 3D printing technology.

[0004] In the prior art, the support metal is removed by melting it in a heating furnace and then dripping it off under the action of gravity. This method is simple and convenient, and does not require special equipment. However, since the solid model metal and the liquid support metal are often in an infiltration state, the liquid support metal material will extend and adhere to the surface of the solid workpiece, resulting in the inability to completely remove the support metal material by gravity alone, resulting in a hanging phenomenon, and the removal speed is also slow. A better method and special equipment are needed to completely remove the support material. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for removing support metal in cold spray deposition 3D printing. The support metal is removed by relying on the centrifugal force generated by the rotation of the workpiece. Not only is the removal efficiency high, but it also avoids the problems of the prior art that the liquid support metal and the solid model metal are infiltrated and are difficult to completely remove, and the occurrence of sagging. For some workpieces with complex shapes, the effect is more obvious.

[0006] In order to achieve the above object, the first technical solution of the present invention is implemented as follows, which is a method for efficiently removing cold spray deposited 3D printing support metal using centrifugal force, comprising:

[0007] Step 1: Install the workpiece and balance block

[0008] Install three baffles on the receiving tray, and the three baffles are respectively located on the left side, right side and rear side of the receiving tray;

[0009] Install the printed workpiece on the turntable and secure it with bolts, nuts and washers;

[0010] Adjust the position of the balancing block on the turntable until the controller detects that the vibration displacement value of the furnace frame does not exceed 0.5mm when the turntable rotates, and then fix the balancing block;

[0011] Install the fourth baffle plate on the receiving tray, and the fourth baffle plate is located at the front side of the receiving tray;

[0012] Step 2: Heat and melt the support metal

[0013] ① Turn on the heating through the controller to raise the furnace temperature to Tr = Tm + (50-80) °C, where Tm is the melting point of the supporting metal;

[0014] ② Maintain the temperature at Tr±10℃ for 30-60 minutes to melt the support metal and gradually drip into the receiving tray;

[0015] Step 3: Remove the support metal using centrifugal force

[0016] ① Start the reduction motor to drive the turntable to rotate, and gradually accelerate the turntable to 200-600r / min;

[0017] ② Under the centrifugal force generated by the rotation, the liquid support metal attached to the surface of the workpiece is quickly thrown out, and the turntable stops rotating after rotating for 3-5 minutes;

[0018] Step 4: Workpiece post-processing

[0019] ① Loosen the workpiece and the balance block, and remove the workpiece;

[0020] ② Clean the surface of the workpiece.

[0021] In the present technical solution, when the vibration sensor detects that the vibration displacement value of the furnace frame exceeds 1.5 mm, the controller performs emergency braking on the reduction motor and restarts it after the position of the balancing block is readjusted.

[0022] In order to achieve the above object, the second technical solution of the present invention is implemented as follows: it is a device for efficiently removing cold spray deposited 3D printing support metal by using centrifugal force, characterized by comprising:

[0023] A heating furnace; the heating furnace comprises a furnace frame, a furnace door, a heating element and a heat-insulating material; a heating chamber is arranged in the furnace frame, the furnace door is installed at the opening of the heating chamber so as to open or close the heating chamber, the heat-insulating material wraps the heating chamber, and the heating element is located at the outer wall of the heating chamber so as to heat the heating chamber;

[0024] Rotating mechanism; the rotating mechanism comprises a reduction motor, a transmission shaft, a mounting sleeve and an end cover; the mounting sleeve is mounted on the furnace frame, the reduction motor is mounted on the support of the mounting sleeve, the transmission shaft is rotatably mounted in the mounting sleeve, and the lower part of the transmission shaft is located in the heating chamber after passing through the furnace frame and the insulation material, the output end of the reduction motor is connected to the upper part of the transmission shaft to drive the transmission shaft to rotate, and the end cover is covered at the upper opening of the mounting sleeve to axially position the transmission shaft;

[0025] A turntable mechanism; the turntable mechanism comprises a turntable, a workpiece, a balancing block, a receiving tray and four baffles; the turntable is mounted at the lower part of the transmission shaft so that the transmission shaft drives the turntable to rotate; the workpiece and the balancing block are fastened to the turntable and are located on both sides of the turntable, the turntable surface is provided with 6-12 long grooves for installing the workpiece or the balancing block in the circumferential direction, and the outer circumference of the turntable is provided with a flange of 5-10mm high for bearing the centrifugal force of the workpiece or the balancing block; the receiving tray is a rectangular box, the receiving tray is placed at the bottom of the heating chamber, and the receiving tray is used to store the workpiece support metal that is molten and dripping or thrown out by rotation; the four baffles are respectively clamped on the receiving tray, and are located at the front, rear, left and right sides of the receiving tray so that the thrown out liquid support metal is introduced into the receiving tray through the baffles around it; and

[0026] Control system; the control system includes a controller, a temperature sensor and a vibration sensor; the temperature sensor is located in the heating chamber to monitor the temperature of the heating chamber, and the vibration sensor is installed on the outer wall of the furnace rack to monitor the vibration amplitude of the furnace rack and the turntable.

[0027] In the technical solution, a transmission shaft seal is also included. The transmission shaft seal is located between the transmission shaft and the thermal insulation material, and the transmission shaft seal is made of dust-free asbestos cloth.

[0028] In the present technical solution, it also includes a first transmission gear and a second transmission gear. The first transmission gear is connected to the output shaft of the reduction motor, and the second transmission gear is mounted on the upper part of the transmission shaft. The first transmission gear and the second transmission gear are meshed so that the reduction motor drives the transmission shaft to rotate. The first transmission gear and the second transmission gear are lubricated with high-temperature grease.

[0029] In the present technical solution, it also includes a first bearing, a second bearing and a third bearing. The first bearing, the second bearing and the third bearing are installed in the mounting sleeve from top to bottom in sequence. The transmission shaft is installed in the mounting sleeve through the first bearing, the second bearing and the third bearing. The first bearing is a deep groove ball or cylindrical roller bearing, the second bearing is a self-aligning bearing, and the third bearing is a thrust ball bearing. The first bearing, the second bearing and the third bearing are all lubricated with high-temperature grease.

[0030] In the present technical scheme, it also includes a key, a locking washer, a locking nut, a clamping bolt, a nut and a washer; the turntable is installed on the transmission shaft through the locking washer and the locking nut to drive the turntable to rotate, the workpiece and the balance block are fastened to the turntable through the clamping bolts, nuts and washers, the key is installed on the lower part of the transmission shaft, and key slots are opened on the transmission shaft and the turntable. The key is installed in the key slot so that the transmission shaft drives the turntable to rotate.

[0031] In the present technical solution, the temperature sensor is a thermocouple temperature sensor.

[0032] The advantages of the present invention over the prior art are as follows: compared with the conventional method of relying solely on the dripping of the heated supporting metal under the action of gravity, the present invention relies on the centrifugal force generated by the rotation of the workpiece to remove the supporting metal, which not only has a high removal efficiency, but also avoids the problems of the prior art methods that are difficult to completely remove due to the infiltration of the liquid supporting metal and the solid model metal, and the occurrence of sagging. For some workpieces with complex shapes, the advantages are even more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the device for removing the support metal of cold spray deposition 3D printing of the present invention;

[0034] Figure 2 yes Figure 1 A top view of

[0035] Figure 3 It is a schematic diagram of the turntable parts of the present invention. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] In the description of the present invention, the directions or positional relationships indicated by the terms "left", "right", "front", "back", "up" and "down" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention rather than requiring that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0038] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Example

[0039] like Figures 1 to 3 As shown, it is a method for removing support metal by cold spray deposition 3D printing, which is characterized by comprising the following steps:

[0040] Step 1: Install the workpiece and balance block

[0041] ① The three baffles 25 are clamped on the receiving tray 24, and the three baffles 25 are respectively located on the left side, the right side and the rear side of the receiving tray 24;

[0042] ② Install the printed workpiece 19 on the turntable 15 and fix it;

[0043] ③ Adjust the position of the balancing block 20 on the turntable 15 until the controller 25 detects that the vibration displacement value of the furnace frame 1 does not exceed 0.5 mm when the turntable 15 rotates, and then fix the balancing block 20;

[0044] ④ Clamp the fourth baffle plate 25 onto the receiving tray 24 , and the fourth baffle plate 25 is located at the front side of the receiving tray 24 .

[0045] Step 2: Heat and melt the support metal

[0046] ① Turn on the heating through the controller 28 to raise the furnace temperature to Tr = Tm + 50-80°C, where Tm is the melting point of the supporting metal 191;

[0047] ② Maintain the temperature at Tr±10℃ for 30-60 minutes to melt the support metal 191 and gradually drip into the receiving tray 24;

[0048] Step 3: Remove the support metal using centrifugal force

[0049] ① Start the reduction motor 6 to drive the turntable 15 to rotate, and gradually accelerate the turntable 15 to 200-600r / min;

[0050] ② Under the centrifugal force generated by the rotation, the liquid support metal 191 attached to the surface of the workpiece 19 is quickly thrown out, and the turntable 15 stops rotating after rotating for 3-5 minutes;

[0051] Step 4: Workpiece post-processing

[0052] ① Loosen the workpiece 19 and the balancing block 20, and remove the workpiece 19;

[0053] ② Clean the surface of the workpiece.

[0054] When in use, the device utilizes centrifugal force to efficiently remove the support metal of cold spray deposition 3D printing, including:

[0055] A heating furnace; the heating furnace comprises a furnace frame 1, a furnace door 2, a heating element 3 and a heat-insulating material 4; a heating chamber 1a is provided in the furnace frame 1, the furnace door 2 is installed at the opening of the heating chamber 1a so as to open or close the heating chamber 1a, the heat-insulating material 4 wraps the heating chamber 1a, and the heating element 3 is located at the outer wall of the heating chamber 1a so as to heat the heating chamber 1a;

[0056] Rotating mechanism; the rotating mechanism comprises a reduction motor 6, a transmission shaft 9, a mounting sleeve 10 and an end cover 11; the mounting sleeve 10 is mounted on the furnace frame 1, the reduction motor 6 is mounted on the support of the mounting sleeve 10, the transmission shaft 9 is rotatably mounted in the mounting sleeve 10, and the lower part of the transmission shaft 9 is located in the heating chamber 1a after passing through the furnace frame 1 and the insulation material 4, the output end of the reduction motor 6 is connected to the upper part of the transmission shaft 9 to drive the transmission shaft 9 to rotate, and the end cover 11 covers the upper opening of the mounting sleeve 10 to axially position the transmission shaft 9;

[0057] The turntable mechanism comprises a turntable 15, a workpiece 19, a balancing block 20, a receiving plate 24 and four baffles 25; the turntable 15 is installed at the lower part of the transmission shaft 9 so that the transmission shaft 9 drives the turntable 15 to rotate; the workpiece 19 and the balancing block 20 are fastened on the turntable 15 and are located on both sides of the turntable 15, and the turntable 15 has 6-12 long grooves for installing the workpiece 19 or the balancing block 20 along the circumferential direction, and the outer circumference of the turntable 15 is provided with 5-10 The material receiving tray 24 is a rectangular box placed at the bottom of the heating chamber 1a, and is used to store the support metal 191 that is molten and drips or is thrown out by rotation; the four baffles 25 are respectively mounted on the material receiving tray 24, and are located at the front, rear, left and right sides of the material receiving tray 24 so that the thrown out liquid support metal is introduced into the material receiving tray 24 through the baffles 25 on all sides; and

[0058] Control system; the control system includes a controller 28, a temperature sensor 26 and a vibration sensor 27; the temperature sensor 26 is located in the heating chamber 1a to monitor the temperature of the heating chamber 1a, and the vibration sensor 27 is installed on the outer wall of the furnace frame 1 to monitor the vibration amplitude of the furnace frame 1 and the turntable 15.

[0059] In this embodiment, when the vibration displacement value detected by the vibration sensor 27 exceeds 1.5 mm, the control system performs emergency braking on the reduction motor 6 and restarts after the position of the balancing block 20 is readjusted. Example

[0060] like Figures 1 to 3 As shown, it is a device for removing support metal by cold spray deposition 3D printing, which is characterized by comprising:

[0061] A heating furnace; the heating furnace comprises a furnace frame 1, a furnace door 2, a heating element 3 and a heat-insulating material 4; a heating chamber 1a is provided in the furnace frame 1, the furnace door 2 is installed at the opening of the heating chamber 1a so as to open or close the heating chamber 1a, the heat-insulating material 4 wraps the heating chamber 1a, and the heating element 3 is located at the outer wall of the heating chamber 1a so as to heat the heating chamber 1a;

[0062] Rotating mechanism; the rotating mechanism comprises a reduction motor 6, a transmission shaft 9, a mounting sleeve 10 and an end cover 11; the mounting sleeve 10 is mounted on the furnace frame 1, the reduction motor 6 is mounted on the support of the mounting sleeve 10, the transmission shaft 9 is mounted in the mounting sleeve 10, and the lower part of the transmission shaft 9 is located in the heating chamber 1a after passing through the furnace frame 1 and the insulation material 4, the output end of the reduction motor 6 is connected to the upper part of the transmission shaft 9 to drive the transmission shaft 9 to rotate, and the end cover 11 covers the upper opening of the mounting sleeve 10 to position the transmission shaft 9 axially;

[0063] The turntable mechanism comprises a turntable 15, a workpiece 19, a balancing block 20, a receiving plate 24 and four baffles 25; the turntable 15 is installed at the lower part of the transmission shaft 9 so that the transmission shaft 9 drives the turntable 15 to rotate; the workpiece 19 and the balancing block 20 are fastened on the turntable 15 and are located on both sides of the turntable 15, and the turntable 15 has 6-12 long grooves for installing the workpiece 19 or the balancing block 20 along the circumferential direction, and the outer circumference of the turntable 15 is provided with 5-10 The material receiving tray 24 is a rectangular box placed at the bottom of the heating chamber 1a, and is used to store the support metal 191 that is molten and drips or is thrown out by rotation; the four baffles 25 are respectively mounted on the material receiving tray 24, and are located at the front, rear, left and right sides of the material receiving tray 24 so that the thrown out liquid support metal is introduced into the material receiving tray 24 through the baffles 25 on all sides; and

[0064] Control system; the control system includes a controller 28, a temperature sensor 26 and a vibration sensor 27; the temperature sensor 26 is located in the heating chamber 1a to monitor the temperature of the heating chamber 1a, and the vibration sensor 27 is installed on the outer wall of the furnace frame 1 to monitor the vibration amplitude of the furnace frame 1 and the turntable 15.

[0065] During operation, the method for efficiently removing the cold spray deposited 3D printing support metal by using centrifugal force comprises the following steps:

[0066] Step 1: Install the workpiece and balance block

[0067] ① The three baffles 25 are clamped on the receiving tray 24, and the three baffles 25 are respectively located on the left side, the right side and the rear side of the receiving tray 24;

[0068] ② Install the printed workpiece 19 on the turntable 15 and fix it;

[0069] ③ Adjust the position of the balancing weight 20 on the turntable 15 until the controller 25 detects that the vibration displacement value of the turntable 15 does not exceed 0.5 mm when the turntable 15 rotates, and then fix the balancing weight 20;

[0070] ④ Clamp the fourth baffle plate 25 onto the receiving tray 24 , and the fourth baffle plate 25 is located at the front side of the receiving tray 24 .

[0071] Step 2: Heat and melt the support metal

[0072] ① Turn on the heating through the controller 28 to raise the furnace temperature to Tr = Tm + 50-80°C, where Tm is the melting point of the supporting metal 191;

[0073] ② Maintain the temperature at Tr±10℃ for 30-60 minutes to melt the support metal 191 and gradually drip into the receiving tray 24;

[0074] Step 3: Remove the support metal using centrifugal force

[0075] ① Start the reduction motor 6 to drive the turntable 15 to rotate, and gradually accelerate the turntable 15 to 200-600r / min;

[0076] ② Under the centrifugal force generated by the rotation, the liquid support metal 191 attached to the surface of the workpiece 19 is quickly thrown out, and the turntable 15 stops rotating after rotating for 3-5 minutes;

[0077] Step 4: Workpiece post-processing

[0078] ① Loosen the workpiece 19 and the balancing block 20, and remove the workpiece 19;

[0079] ② Clean the surface of the workpiece.

[0080] In this embodiment, a transmission shaft seal 5 is also included. The transmission shaft seal 5 is located between the transmission shaft 9 and the heat insulation material 4. The transmission shaft seal 5 is made of dust-free asbestos cloth.

[0081] In this embodiment, it also includes a first transmission gear 7 and a second transmission gear 8. The first transmission gear 7 is connected to the output shaft of the reduction motor 6, and the second transmission gear 8 is sleeved on the upper part of the transmission shaft 9. The first transmission gear 7 and the second transmission gear 8 are meshed so that the reduction motor 6 drives the transmission shaft 9 to rotate. The first transmission gear 7 and the second transmission gear 8 are lubricated with high-temperature grease.

[0082] In this embodiment, it also includes a first bearing 12, a second bearing 13 and a third bearing 14, which are installed in the mounting sleeve 10 from top to bottom in sequence, and the transmission shaft 9 is installed in the mounting sleeve 10 through the first bearing 12, the second bearing 13 and the third bearing 14. The first bearing 12 is a deep groove ball or cylindrical roller bearing, the second bearing 13 is a self-aligning bearing, and the third bearing 14 is a thrust ball bearing. The first bearing 12, the second bearing 13 and the third bearing 14 are all lubricated with high-temperature grease.

[0083] In this embodiment, it also includes a key 16, a locking washer 17, a locking nut 18, a clamping bolt 21, a nut 22 and a washer 23; the turntable 15 is installed on the transmission shaft 9 through the locking washer 17 and the locking nut 18 to drive the turntable 15 to rotate, the workpiece 19 and the balancing block 20 are fastened to the turntable 15 through the clamping bolts 21, the nuts 22 and the washers 23, the key 16 is installed at the lower part of the transmission shaft 9, and key slots are opened on the transmission shaft 9 and the turntable 15, and the key 16 is installed in the key slot so that the transmission shaft 9 drives the turntable 15 to rotate.

[0084] In this embodiment, the temperature sensor 26 is a thermocouple temperature sensor.

[0085] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and deformations of these embodiments without departing from the principles and purposes of the present invention still fall within the scope of protection of the present invention.

Claims

1. A method for removing support metal by cold spray deposition 3D printing, wherein the device for removing support metal by cold spray deposition 3D printing comprises: A heating furnace; the heating furnace comprises a furnace frame (1), a furnace door (2), a heating element (3) and a heat-insulating material (4); a heating chamber (1a) is provided in the furnace frame (1); the furnace door (2) is installed at the opening of the heating chamber (1a) so as to open or close the heating chamber (1a); the heat-insulating material (4) wraps the heating chamber (1a); and the heating element (3) is located at the outer wall of the heating chamber (1a) so as to heat the heating chamber (1a); A rotating mechanism; the rotating mechanism comprises a reduction motor (6), a transmission shaft (9), a mounting sleeve (10) and an end cover (11); the mounting sleeve (10) is mounted on a furnace frame (1), the reduction motor (6) is mounted on a support of the mounting sleeve (10), the transmission shaft (9) is mounted in the mounting sleeve (10), and the lower part of the transmission shaft (9) passes through the furnace frame (1) and the heat-insulating material (4) and is located in the heating chamber (1a); the output end of the reduction motor (6) is connected to the upper part of the transmission shaft (9) so as to drive the transmission shaft (9) to rotate; the end cover (11) covers the upper opening of the mounting sleeve (10) so as to axially position the transmission shaft (9); A turntable mechanism; the turntable mechanism comprises a turntable (15), a workpiece (19), a balancing block (20), a receiving plate (24) and four baffles (25); the turntable (15) is mounted on the lower part of a transmission shaft (9) so that the transmission shaft (9) drives the turntable (15) to rotate; the workpiece (19) and the balancing block (20) are fastened to the turntable (15) and are located on both sides of the turntable (15); the turntable (15) has 6 to 12 long grooves along the circumferential direction for mounting the workpiece (19) or the balancing block (20); and the outer circumference of the turntable (15) is provided with A flange with a height of 5-10 mm is provided for bearing the centrifugal force of the workpiece (19) or the balance block (20); the receiving tray (24) is a rectangular box, the receiving tray (24) is placed at the bottom of the heating chamber (1a), and the receiving tray (24) is used to store the support metal (191) that is molten and drips or is thrown out by rotation; the four baffles (25) are respectively mounted on the receiving tray (24) and are located at the front side, the rear side, the left side and the right side of the receiving tray (24) so ​​that the thrown out liquid support metal is introduced into the receiving tray (24) through the baffles (25) on all sides; and A control system; the control system comprises a controller (28), a temperature sensor (26) and a vibration sensor (27); the temperature sensor (26) is located in a heating chamber (1a) so as to monitor the temperature of the heating chamber (1a); the vibration sensor (27) is installed on the outer wall of a furnace frame (1) so as to monitor the vibration amplitude of the furnace frame (1) and a turntable (15); the method comprises the following steps: Step 1: Install the workpiece and balance block The three baffles (25) are clamped onto the receiving tray (24), and the three baffles (25) are respectively located on the left side, the right side and the rear side of the receiving tray (24); The printed workpiece (19) is mounted on the turntable (15) and fixed; Adjusting the position of the balancing weight (20) on the turntable (15) until the controller (28) detects that the vibration displacement value of the furnace frame (1) does not exceed 0.5 mm when the turntable (15) rotates, and then fixing the balancing weight (20); The fourth baffle plate (25) is clamped on the receiving tray (24), and the fourth baffle plate (25) is located at the front side of the receiving tray (24); Step 2: Heat and melt the support metal ① Turn on the heating through the controller (28) to raise the furnace temperature to Tr = Tm + (50-80) °C, where Tm is the melting point of the supporting metal (191); ② Maintain the temperature at Tr±10°C for 30-60 minutes to allow the support metal (191) to melt and gradually drip into the receiving tray (24); Step 3: Remove the support metal using centrifugal force ① Start the reduction motor (6) to drive the turntable (15) to rotate, and gradually accelerate the turntable (15) to 200-600r / min; ② Under the centrifugal force generated by the rotation, the liquid support metal (191) attached to the surface of the workpiece (19) is quickly thrown out, and the turntable (15) rotates for 3-5 minutes and then stops rotating; Step 4: Workpiece post-processing ① Loosen the workpiece (19) and the balancing block (20), and remove the workpiece (19); ② Clean the surface of the workpiece.

2. The method for removing support metal by cold spray deposition 3D printing according to claim 1, characterized in that When the vibration sensor (27) detects that the vibration displacement value of the furnace frame (1) exceeds 1.5 mm, the controller (28) performs emergency braking on the reduction motor (6) and restarts after the position of the balancing block (20) is readjusted.

3. The method for removing support metal by cold spray deposition 3D printing according to claim 1, characterized in that It also includes a transmission shaft seal (5), the transmission shaft seal (5) being located between the transmission shaft (9) and the thermal insulation material (4), and the transmission shaft seal (5) being made of dust-free asbestos cloth.

4. The method for removing support metal by cold spray deposition 3D printing according to claim 1, characterized in that The invention also comprises a first transmission gear (7) and a second transmission gear (8), wherein the first transmission gear (7) is connected to the output shaft of the reduction motor (6), and the second transmission gear (8) is sleeved on the upper part of the transmission shaft (9). The first transmission gear (7) and the second transmission gear (8) are meshed so that the reduction motor (6) drives the transmission shaft (9) to rotate, and the first transmission gear (7) and the second transmission gear (8) are both lubricated with high-temperature grease.

5. The method for removing support metal by cold spray deposition 3D printing according to claim 1, characterized in that The invention also comprises a first bearing (12), a second bearing (13) and a third bearing (14), wherein the first bearing (12), the second bearing (13) and the third bearing (14) are sequentially mounted in the mounting sleeve (10) from top to bottom, and the transmission shaft (9) is mounted in the mounting sleeve (10) via the first bearing (12), the second bearing (13) and the third bearing (14), wherein the first bearing (12) is a deep groove ball bearing or a cylindrical roller bearing, the second bearing (13) is a self-aligning bearing, and the third bearing (14) is a thrust ball bearing, and the first bearing (12), the second bearing (13) and the third bearing (14) are all lubricated with high-temperature grease.

6. The method for removing support metal by cold spray deposition 3D printing according to claim 1, characterized in that The invention also comprises a key (16), a locking washer (17), a locking nut (18), a clamping bolt (21), a nut (22) and a washer (23); the turntable (15) is mounted on the transmission shaft (9) through the locking washer (17) and the locking nut (18), thereby driving the turntable (15) to rotate; the workpiece (19) and the balancing block (20) are fastened to the turntable (15) through the clamping bolt (21), the nut (22) and the washer (23); the key (16) is mounted on the lower part of the transmission shaft (9); key slots are provided on the transmission shaft (9) and the turntable (15); the key (16) is inserted into the key slot, thereby driving the transmission shaft (9) to rotate the turntable (15).

7. The method for removing support metal by cold spray deposition 3D printing according to claim 1, characterized in that The temperature sensor (26) is a thermocouple temperature sensor.

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