Metal additive manufacturing device based on in-situ strengthening treatment technology and application of metal additive manufacturing device

Abstract

The invention provides a metal additive manufacturing device based on an in-situ strengthening treatment technology and application of the metal additive manufacturing device. The strengthening method of the device mainly comprises an in-situ stepping mode and an in-situ continuous machining mode, the strengthening method and the additive manufacturing process can be carried out synchronously, layer-by-layer in-situ machining is carried out on an additive manufacturing workpiece, and efficient structure control and strengthening and toughening of the additive manufacturing workpiece are achieved. The internal hole defects of the additive manufacturing workpiece after in-situ machining are obviously reduced, the internal stress is reduced, the microstructure is refined, and the strength and plasticity are synchronously improved. According to the device, in-situ strengthening can be conducted on the large-size additive manufacturing workpiece, and the technical bottlenecks that according to traditional heat treatment, internal defects of the large-size additive manufacturing workpiece are difficult to eliminate, machining is difficult, and strength and plasticity are difficult to improve synchronously are solved; the barrier that in an existing surface treatment technology, only shallow layer treatment can be conducted on the surface of the additive manufacturing workpiece, and internal defects are difficult to eliminate is broken through. In addition, the method provided by the invention is suitable for in-situ strengthening of printing workpieces of various metal additive manufacturing equipment.

Description

Technical Field

[0001] The present invention relates to the field of metal additive manufacturing, and in particular to a metal additive manufacturing device based on in-situ strengthening processing technology and an application thereof. Background Art

[0002] Additive manufacturing, as a new material forming method, can directly form workpieces of complex shapes, reduce processing steps, and shorten processing cycles. Additive manufacturing technology has broad application prospects, but additively manufactured metal workpieces have problems such as large residual stress, coarse and uneven microstructure, and difficulty in eliminating hole defects. Large residual stress leads to problems such as cracking, fracture and deformation of additively manufactured workpieces during use. Coarse and uneven microstructure will lead to anisotropy of the performance of additively manufactured workpieces, poor corrosion resistance, and short service life. Hole defects will deteriorate the fatigue and mechanical properties of the workpiece. Therefore, the comprehensive performance of additively manufactured workpieces is far behind that of traditional forgings and castings, and they need to be post-processed to achieve comprehensive performance optimization.

[0003] Additive manufacturing requires the direct molding of complex-shaped workpieces, so the post-processing process of the manufactured workpiece cannot include deformation processing, so it can only be strengthened through traditional heat treatment or surface treatment. In order to achieve the homogenization of the microstructure of the additively manufactured metal workpiece and eliminate internal stress, the workpiece after additive manufacturing needs to be kept warm at high temperature for a long time, which will lead to the coarsening of the microstructure and the deterioration of the mechanical properties of the workpiece. The existence of residual stress will cause the deformation or even cracking of the workpiece during the heat treatment process, which cannot meet the requirements of practical applications. For large-sized additively manufactured workpieces, a larger heat treatment furnace is required, which will lead to engineering problems such as low energy utilization, long insulation time, low processing efficiency, and poor atmosphere protection. For large-sized and complex-structured workpieces, surface treatment methods such as laser and shot peening have a shallow processing depth (less than 0.5mm) and can only process the outer surface of the workpiece, which has very limited strengthening of the workpiece. At the same time, traditional heat treatment and surface treatment are difficult to eliminate defects such as keyholes, unfused holes, and micro-pores inside the workpiece. During the long-term service of the workpiece, the interaction between dislocations and these defects will cause premature failure of the workpiece. Therefore, how to eliminate the internal stress and internal hole defects of additively manufactured metal workpieces, make the microstructure homogenous, and ultimately achieve simultaneous improvement of the strength and plasticity of the workpiece is a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a metal additive manufacturing device based on in-situ strengthening treatment technology, which includes: a main machine and a power distribution system 1, an operating table 2, an electrode slider 3, a printing substrate 4, a left mechanical arm 5, a workpiece printing device 6, a left mechanical arm loading device 7, an electrode wheel 8, a sensor 9, a right mechanical arm 10, a right mechanical arm loading device 11, an electrode head 12, a cooling water circulation system 13, a master control device 14, and an air source 15;

[0005] The host and power distribution system 1 are located at the bottom of the in-situ strengthening treatment technology metal additive manufacturing device, the operating table 2 is fixed above the host and power distribution system 1, the printing substrate 4 is located in the middle position above the operating table 2, the electrode slider 3 includes an electrode slider 3-1 and an electrode slider 3-2, the electrode slider 3-1 and the electrode slider 3-2 are respectively fixed on the operating table 2 and located on the left and right sides of the printing substrate 4, for clamping the printing substrate 4, the left robotic arm 5 and the right robotic arm 10 are respectively installed on the left and right sides above the operating table 2, the other ends of the left robotic arm 5 and the right robotic arm 10 are free moving ends, the workpiece printing device 6 and the left robotic arm loading device 7 are connected to the free moving end of the left robotic arm 5, and can The workpiece printing device 6 is located on the left side of the left robot arm loading device 7, and the electrode wheel 8 is fixed below the left robot arm loading device 7, and can move synchronously with the left robot arm loading device 7. The electrode wheel 8 can rotate, and the right robot arm loading device 11 is fixed to the free moving end of the right robot arm 10, and can move synchronously with the free moving end of the right robot arm 10. The electrode head 12 is fixed below the right robot arm loading device 11 and can move synchronously with the right robot arm loading device 11. There are four sensors, among which sensor 9-1 and sensor 9-2 are fixed at the free moving end of the left robot arm 5, respectively located between the workpiece printing device 6 and the left robot arm loading device 7 and the electrode wheel 8, sensors 9-3 and 9-4 are fixed to the free moving end of the right robotic arm 11, respectively located on the left and right sides of the electrode head 12, the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the four sensors, the right robotic arm loading device 11 and the electrode head 12 are located above the printing substrate 4, the cooling water circulation system 13 is installed below the printing substrate 4, the master control device 14 is located in front of the host and the power distribution system 1, the air source 15 is located on the right side of the host and the power distribution system 1, the air source 15 can generate an inert gas flow, the host and the power distribution system 1 can generate a pulse current and control the pulse current parameters, the left robotic arm 5 can drive ... The device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 move simultaneously above the printing substrate 4, the right robot arm 10 can drive the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move simultaneously above the printing substrate 4, the workpiece printing device 6 can be loaded with the metal powder to be processed, the printing substrate 4 and the metal powder to be processed are the same material, the workpiece printing device 6 can emit laser and transmit powder: the workpiece printing device 6 can be connected to the gas source 15, the gas source 15 can provide the workpiece printing device 6 with an inert gas flow, and the inert gas flow generated by the gas source 15 can spray the metal powder to be processed in the workpiece printing device 6 onto the printing substrate 4,The workpiece printing device 6 can evenly spray a layer of metal powder to be processed on the printing substrate 4. The workpiece printing device 6 can obtain molten metal powder after laser processing the metal powder to be processed on the printing substrate 4. The molten metal powder can quickly solidify to form a part of the additively manufactured workpiece after the workpiece printing device 6 is removed. The workpiece printing device 6 can realize laser coaxial powder feeding printing or powder spreading laser printing. The laser coaxial powder feeding printing is: under the protection of inert gas provided by the gas source 15, the left robotic arm 5 drives the workpiece printing device 6 to move. The workpiece printing device 6 can spray the metal powder to be processed onto the printing substrate 4 along the moving path, and at the same time emit laser to melt the metal powder to be processed, and then solidify it. A layer of additive manufacturing workpiece is formed along the moving path, and the powder-laying laser printing is as follows: under the protection of inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the metal powder to be processed on the printing substrate 4, and then the left robotic arm 5 drives the workpiece printing device 6 to move, and the workpiece printing device 6 emits a laser to melt the metal powder along the moving path. After the molten metal powder solidifies, a layer of additive manufacturing workpiece is formed along the moving path. The cooling water circulation system 13 can pass cooling water to cool the printing substrate 4 and the additive manufacturing workpiece above. The electrode wheel 8 can apply pressure to the additive manufacturing workpiece and perform rolling pressurized pulse current treatment on the additive manufacturing workpiece in a rolling manner: the left robotic arm loading device 7 can load the electrode wheel 8 Applying a vertical force, the electrode wheel 8 can fit tightly against the upper surface of the additively manufactured workpiece and roll on the surface of the additively manufactured workpiece driven by the left robotic arm 5, the main machine and power distribution system 1, the electrode slider 3-1, the electrode slider 3-2, the printing substrate 4, the additively manufactured workpiece and the electrode wheel 8 can form a pulse current loop, the main machine and power distribution system 1 can generate a pulse current and pass the pulse current into the loop, the electrode head 12 can apply pressure to the additively manufactured workpiece and perform pressurized pulse current treatment on the additively manufactured workpiece: the right robotic arm loading device 11 can apply a vertical force to the electrode head 12, and the electrode head 12 can fit tightly against the upper surface of the additively manufactured workpiece when the right robotic arm loading device 11 applies a vertical force The upper surface of the additively manufactured workpiece, the main machine and distribution system 1, the electrode slider 3-1, the electrode slider 3-2, the printing substrate 4, the additively manufactured workpiece and the electrode head 12 can form a pulse current loop, the sensor 9 is a displacement sensor, the sensor 9-1 can record the height of the additively manufactured workpiece when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, the sensor 9-2 can record the height of the additively manufactured workpiece after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment, the master control device 14 can calculate the height difference of the additively manufactured workpiece before and after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment on the additively manufactured workpiece according to the height changes recorded by the sensors 9-1 and 9-2,The powder feeding amount when the workpiece printing device 6 prints the next layer of the additively manufactured workpiece is adjusted according to the height difference. The sensor 9-3 can record the height of the additively manufactured workpiece when the electrode head 12 is not used to perform pressurized pulse current treatment. The sensor 9-4 can record the height of the additively manufactured workpiece after the electrode head 12 is used to perform pressurized pulse current treatment. The master control device 14 can calculate the height difference of the additively manufactured workpiece before and after the pressurized pulse current treatment of the additively manufactured workpiece using the electrode head 12 according to the height changes recorded by the sensors 9-3 and 9-4, and adjust the powder feeding amount when the workpiece printing device 6 prints the next layer of the additively manufactured workpiece according to the height difference. The master control device 1 4 can control the left robot arm 5 to drive the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move at the same time and the moving speed; control the right robot arm 10 to drive the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move at the same time and the moving speed; control the left robot arm loading device 7 and the right robot arm loading device 11 to start or unload; control the start and powder feeding amount of the workpiece printing device 6; regulate the workpiece printing device 6 to perform laser coaxial powder feeding printing or powder spreading laser printing; control the left robot arm loading device 7, the right robot arm loading device 11, the electrode wheel 8 and the electrode head 12 to process the additive manufacturing workpiece. ,

[0006] The present invention also provides an application of a metal additive manufacturing device based on in-situ strengthening treatment technology in the field of in-situ treatment of additive manufacturing workpieces, the application includes in-situ stepping and in-situ continuous processing methods, the in-situ stepping processing method is laser coaxial powder feeding printing in-situ stepping processing or powder spreading laser printing in-situ stepping processing, the in-situ continuous processing method is laser coaxial powder feeding printing in-situ continuous processing or powder spreading laser printing in-situ continuous processing.

[0007] Furthermore, the laser coaxial powder feeding printing in-situ stepping processing is:

[0008] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the master control device 14, set the workpiece printing device 6 to perform laser coaxial powder feeding printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot arm 5 to drive the workpiece printing device 6 to move above the printing substrate 4, move the right robot arm 10 to drive the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move simultaneously above the printing substrate 4 and to the right side of the workpiece printing device 6, and then, under the protection of the inert gas provided by the gas source 15, the left robot arm 5 drives the workpiece printing device 6 to move 10-1000 mm to the left at a speed of 0.5-50 mm / s. At the same time, the gas source 15 generates an inert gas to spray the metal powder to be processed onto the printing substrate 4, and at the same time, the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece;

[0009] (2) Repeat step (1) to print N layers of additive manufacturing workpieces on top of the first layer of additive manufacturing workpiece to obtain additive manufacturing workpiece 1, the right robot arm 10 drives the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move leftward to the upper right of the additive manufacturing workpiece 1, and the sensor 9-3 records the height of the additive manufacturing workpiece 1 when the electrode head 12 is not used to perform pressurized pulse current treatment, and then the right robot arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additive manufacturing workpiece 1, and the additive manufacturing workpiece 1 is subjected to the first pressurized pulse current treatment to obtain the additive manufacturing workpiece 1 after the pressurized pulse current treatment, and then the right robot arm loading device 1 is unloaded, and the sensor 9-4 records the height of the additive manufacturing workpiece 1 after the pressurized pulse current treatment is performed using the electrode head 12 The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the pressurized pulse current treatment is performed on the additively manufactured workpiece 1 by the electrode head 12, and then performs multiple in-situ stepping treatments on the additively manufactured workpiece 1 after the pressurized pulse current treatment, until the in-situ stepping treatment additively manufactured workpiece 2 is obtained after the entire upper surface of the additively manufactured workpiece is processed, and each in-situ stepping treatment is as follows: the right robotic arm 10 drives the right robotic arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move 1-40mm to the left, and then the right robotic arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additively manufactured workpiece, and then after the pressurized pulse current treatment is performed on the additively manufactured workpiece, the right robotic arm loading device 11 is unloaded, and the N is an integer, and the value range is 0-260;

[0010] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing laser coaxial powder feeding to print the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ step-processed additively manufactured workpiece 4;

[0011] (4) processing the in-situ step-processed additively manufactured workpiece 4 1-590 times according to the processing method of step (3) to obtain an in-situ step-processed additively manufactured workpiece;

[0012] The pulse current treatment described in step (2) is as follows: the current magnitude is 0.005-45 kA, the voltage magnitude is 1.5-110 V, the frequency is 5-2000 Hz, and the treatment time is 0.001-30 s.

[0013] Furthermore, the powder-laying laser printing in-situ stepping process is as follows:

[0014] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform powder laser printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot 5 to drive the workpiece printing device 6 to move above the printing substrate 4, move the right robot 10 to drive the right robot loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move simultaneously above the printing substrate 4 and to the right side of the workpiece printing device 6, and then, under the protection of the inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the metal powder to be processed on the printing substrate 4, and then the left robot 5 drives the workpiece printing device 6 to move 10-1000 mm to the left at a speed of 0.5-50 mm / s, while the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece;

[0015] (2) Repeat step (1) to print M layers of additive manufacturing workpieces on top of the first layer of additive manufacturing workpiece to obtain additive manufacturing workpiece 1, the right robot arm 10 drives the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move to the left to the upper right of the additive manufacturing workpiece 1, the sensor 9-3 records the height of the additive manufacturing workpiece 1 when the electrode head 12 is not used to perform pressurized pulse current treatment, the right robot arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additive manufacturing workpiece 1, and the additive manufacturing workpiece 1 is subjected to the first pressurized pulse current treatment to obtain the additive manufacturing workpiece 1 after the pressurized pulse current treatment, and then the right robot arm loading device 1 is unloaded, and the sensor 9-4 records the height of the additive manufacturing workpiece 1 after the pressurized pulse current treatment using the electrode head 12 The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the pressurized pulse current treatment is performed on the additively manufactured workpiece 1 by the electrode head 12, and then performs multiple in-situ stepping treatments on the additively manufactured workpiece 1 after the pressurized pulse current treatment, until the upper surface of the entire additively manufactured workpiece is processed to obtain the in-situ stepping treatment additively manufactured workpiece 2, each in-situ stepping treatment is as follows: the right robotic arm 10 drives the right robotic arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move 1-40mm to the left, and then the right robotic arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additively manufactured workpiece, and then after the pressurized pulse current treatment is performed on the additively manufactured workpiece, the right robotic arm loading device 11 is unloaded, and the M is an integer, and the value range is 0-265;

[0016] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing powder laser printing of the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ step-processed additively manufactured workpiece 4;

[0017] (4) processing the in-situ step-processed additively manufactured workpiece 4 1-580 times according to the processing method of step (3) to obtain an in-situ step-processed additively manufactured workpiece;

[0018] The pulse current treatment described in step (2) is as follows: the current magnitude is 0.001-63 kA, the voltage magnitude is 1.8-180 V, the frequency is 8-1900 Hz, and the treatment time is 0.02-35 s.

[0019] Furthermore, the laser coaxial powder feeding printing in-situ continuous processing is:

[0020] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform laser coaxial powder feeding printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot 5 to drive the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the top of the printing substrate 4 at the same time, and under the protection of the inert gas provided by the gas source 15, the left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move 50-1500 mm to the left at a speed of 0.5-50 mm / s. At the same time, the gas source 15 generates an inert gas flow to spray the metal powder to be processed onto the printing substrate 4, and at the same time, the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece;

[0021] (2) Repeat step (1) to print X layers of additively manufactured workpieces on top of the first layer of additively manufactured workpieces to obtain additively manufactured workpiece 1. The left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the upper right of the additively manufactured workpiece 1 at the same time. After the sensor 9-1 records the height of the additively manufactured workpiece 1 when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, the left robot arm loading device 7 applies a force of 0.5-3000N to make the electrode wheel 8 fit closely to the additively manufactured workpiece 1, and then the additively manufactured workpiece 1 is subjected to the rolling pressurized pulse current treatment. The upper surface of the workpiece 1 is subjected to rolling pressurized pulse current treatment at a speed of 0.5-50 mm / s. After the upper surface of the entire additively manufactured workpiece 1 is processed, the in-situ continuously processed additively manufactured workpiece 2 is obtained, and then the left robotic arm loading device 7 is unloaded. The sensor 9-2 records the height of the additively manufactured workpiece 1 after the rolling pressurized pulse current treatment using the electrode wheel 8. The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the rolling pressurized pulse current treatment using the electrode wheel 8. The X is an integer, and the value range is 0-255;

[0022] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing laser coaxial powder feeding to print the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ continuously processed additively manufactured workpiece 4;

[0023] (4) processing the in-situ continuous processing additively manufactured workpiece 4 1-800 times according to the processing method of step (3) to obtain an in-situ continuous strengthening additively manufactured workpiece;

[0024] The pulse current treatment described in step (2) is as follows: the current magnitude is 0.03-58 kA, the voltage magnitude is 0.2-380 V, the frequency is 3-5000 Hz, and the treatment time is 1-3000 s.

[0025] Furthermore, the powder-laying laser printing in-situ continuous processing is:

[0026] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform powder laser printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robotic arm 5 to drive the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the top of the printing substrate 4 at the same time, and then under the protection of the inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the metal powder to be processed on the printing substrate 4, and then the left robotic arm 5 drives the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move 50-1500 mm to the left at a speed of 0.5-50 mm / s, while the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece;

[0027] (2) Repeat step (1) to print Y layers of additively manufactured workpieces on top of the first layer of additively manufactured workpieces to obtain additively manufactured workpiece 1. The left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the upper right of the additively manufactured workpiece 1 at the same time. After the sensor 9-1 records the height of the additively manufactured workpiece 1 when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, the left robot arm loading device 7 applies a force of 0.5-3000N to make the electrode wheel 8 fit closely to the additively manufactured workpiece 1, and then the additively manufactured workpiece 1 is subjected to the rolling pressurized pulse current treatment. The upper surface of the workpiece 1 is subjected to rolling pressurized pulse current treatment at a speed of 0.5-50 mm / s. After the upper surface of the entire additively manufactured workpiece 1 is processed, the in-situ continuously processed additively manufactured workpiece 2 is obtained, and then the left robotic arm loading device 7 is unloaded. The sensor 9-2 records the height of the additively manufactured workpiece 1 after the rolling pressurized pulse current treatment using the electrode wheel 8. The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the rolling pressurized pulse current treatment using the electrode wheel 8. The Y is an integer, and the value range is 0-270;

[0028] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing powder laser printing of the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ continuously processed additively manufactured workpiece 4;

[0029] (4) processing the in-situ continuous processing additively manufactured workpiece 4 1-850 times according to the processing method of step (3) to obtain an in-situ continuous strengthening additively manufactured workpiece;

[0030] The pulse current treatment described in step (2) is as follows: the current magnitude is 0.07-56 kA, the voltage magnitude is 0.8-330 V, the frequency is 15-4500 Hz, and the treatment time is 0.5-2990 s.

[0031] Furthermore, the metal powder is TC4, TB8, TC17, TA0, TA16, TA18 titanium alloy, AISI420, AISI430 stainless steel, 35CrMo, 42CrMo steel, QT500-7, QT600-3 ductile iron, Ti 50.0 Ni 50.0 、Ti 49.6 Ni 50.4 、Ti 49.2 Ni 50.8 、Ti 48.8 Ni 51.2 or Ti 48.5 Ni 51.5 A type of alloy powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a metal additive manufacturing device based on in-situ strengthening processing technology;

[0033] Figure 2 It is a partial schematic diagram of the free moving end of the left robotic arm 5;

[0034] Figure 3 It is a partial schematic diagram of the free moving end of the right robotic arm 10;

[0035] Figure 4 (a) and (b) are optical microscopic comparison images of the microstructure of the additively manufactured TC4 workpiece and the TC4 workpiece after in-situ step-enhanced additive manufacturing, respectively. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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.

[0037] A metal additive manufacturing device based on in-situ strengthening treatment technology, comprising: a main machine and power distribution system 1, an operating table 2, an electrode slider 3, a printing substrate 4, a left mechanical arm 5, a workpiece printing device 6, a left mechanical arm loading device 7, an electrode wheel 8, a sensor 9, a right mechanical arm 10, a right mechanical arm loading device 11, an electrode head 12, a cooling water circulation system 13, a master control device 14, and an air source 15;

[0038] The host and power distribution system 1 are located at the bottom of the in-situ strengthening treatment technology metal additive manufacturing device, the operating table 2 is fixed above the host and power distribution system 1, the printing substrate 4 is located in the middle position above the operating table 2, the electrode slider 3-1 and the electrode slider 3-2 are respectively fixed on the operating table 2, located on the left and right sides of the printing substrate 4, and are used to clamp the printing substrate 4. One end of the left robotic arm 5 and the right robotic arm 10 are respectively installed on the left and right sides above the operating table 2, and the other end of the left robotic arm 5 and the right robotic arm 10 are free moving ends. The workpiece printing device 6 and the left robotic arm loading device 7 are connected to the free moving end of the left robotic arm 5 and can move synchronously with the free moving end of the left robotic arm 5. The workpiece printing device 6 is located The electrode wheel 8 is fixed to the left side of the left robot loading device 7, and can move synchronously with the left robot loading device 7. The electrode wheel 8 can rotate. The right robot loading device 11 is fixed to the free moving end of the right robot 10, and can move synchronously with the free moving end of the right robot 10. The electrode head 12 is fixed to the bottom of the right robot loading device 11, and can move synchronously with the right robot loading device 11. There are four sensors in total, among which sensor 9-1 and sensor 9-2 are fixed to the free moving end of the left robot 5, respectively located between the workpiece printing device 6 and the left robot loading device 7 and to the upper right of the electrode wheel 8. Sensors 9-3 and 9-4 are fixed to the free moving end of the right robot 11. The mobile end is located on the left and right sides of the electrode head 12, respectively. The workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, 4 sensors, the right robot arm loading device 11 and the electrode head 12 are located above the printing substrate 4. The cooling water circulation system 13 is installed below the printing substrate 4. The master control device 14 is located in front of the host and the power distribution system 1. The air source 15 is located on the right side of the host and the power distribution system 1. The air source 15 can generate an inert gas flow. The host and the power distribution system 1 can generate a pulse current and control the pulse current parameters. The left robot 5 can drive the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to be on the printing substrate 4 at the same time. The right robot arm 10 can drive the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move above the printing substrate 4 at the same time. The workpiece printing device 6 can be loaded with metal powder to be processed. The printing substrate 4 and the metal powder to be processed are the same material. The workpiece printing device 6 can emit laser and transmit powder: the workpiece printing device 6 can be connected to the gas source 15, and the gas source 15 can provide an inert gas flow for the workpiece printing device 6. The inert gas flow generated by the gas source 15 can spray the metal powder to be processed in the workpiece printing device 6 onto the printing substrate 4. The workpiece printing device 6 can evenly spray a layer of metal powder to be processed on the printing substrate 4.The workpiece printing device 6 can obtain molten metal powder after laser processing the metal powder to be processed on the printing substrate 4. The molten metal powder can quickly solidify to form a part of the additive manufacturing workpiece after the workpiece printing device 6 is removed. The workpiece printing device 6 can realize laser coaxial powder feeding printing or powder spreading laser printing. The laser coaxial powder feeding printing is: under the protection of inert gas provided by the gas source 15, the left robot arm 5 drives the workpiece printing device 6 to move, and the workpiece printing device 6 can spray the metal powder to be processed onto the printing substrate 4 along the moving path, and at the same time emit laser to melt the metal powder to be processed, and then form a layer of additive manufacturing workpiece along the moving path after solidification. The powder spreading laser printing is: under the protection of inert gas provided by the gas source 15, the left robot arm 5 drives the workpiece printing device 6 to move, and the workpiece printing device 6 can spray the metal powder to be processed onto the printing substrate 4 along the moving path, and at the same time emit laser to melt the metal powder to be processed, and then form a layer of additive manufacturing workpiece along the moving path after solidification. Under the protection of inert gas, the workpiece printing device 6 first evenly spreads the metal powder to be processed on the printing substrate 4, and then the left robotic arm 5 drives the workpiece printing device 6 to move. The workpiece printing device 6 emits a laser to melt the metal powder along the moving path. After the molten metal powder solidifies, a layer of additive manufacturing workpiece is formed along the moving path. The cooling water circulation system 13 can pass cooling water to cool the printing substrate 4 and the additive manufacturing workpiece above. The electrode wheel 8 can apply pressure to the additive manufacturing workpiece and perform rolling pressurized pulse current treatment on the additive manufacturing workpiece in a rolling manner: the left robotic arm loading device 7 can apply vertical force to the electrode wheel 8, and the electrode wheel 8 can fit tightly to the upper surface of the additive manufacturing workpiece. And it rolls on the surface of the additively manufactured workpiece driven by the left robotic arm 5. The main machine and power distribution system 1, the electrode slider 3-1, the electrode slider 3-2, the printing substrate 4, the additively manufactured workpiece and the electrode wheel 8 can form a pulse current loop. The main machine and power distribution system 1 can generate a pulse current and pass the pulse current into the loop. The electrode head 12 can apply pressure to the additively manufactured workpiece and perform pressurized pulse current treatment on the additively manufactured workpiece: the right robotic arm loading device 11 can apply a vertical force to the electrode head 12, and the electrode head 12 can fit tightly to the upper surface of the additively manufactured workpiece when the right robotic arm loading device 11 applies a vertical force. The main machine and power distribution system 1, the electrode slider 3-1, The electrode slider 3-2, the printing substrate 4, the additively manufactured workpiece and the electrode head 12 can form a pulse current loop, the sensor 9 is a displacement sensor, the sensor 9-1 can record the height of the additively manufactured workpiece when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, and the sensor 9-2 can record the height of the additively manufactured workpiece after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment. The master control device 14 can calculate the height difference of the additively manufactured workpiece before and after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment on the additively manufactured workpiece according to the height changes recorded by the sensors 9-1 and 9-2, and adjust the powder feeding amount when the workpiece printing device 6 prints the next layer of the additively manufactured workpiece according to the height difference.The sensor 9-3 can record the height of the additively manufactured workpiece when the electrode head 12 is not used to perform pressurized pulse current treatment, and the sensor 9-4 can record the height of the additively manufactured workpiece after the electrode head 12 is used to perform pressurized pulse current treatment. The master control device 14 can calculate the height difference of the additively manufactured workpiece before and after the pressurized pulse current treatment of the additively manufactured workpiece using the electrode head 12 based on the height changes recorded by the sensors 9-3 and 9-4, and adjust the powder feeding amount when the workpiece printing device 6 prints the next layer of the additively manufactured workpiece according to the height difference. The master control device 14 can control the left robotic arm 5 to drive the workpiece printing device 6 and the left robotic arm loading Device 7, electrode wheel 8, sensor 9-1 and sensor 9-2 move at the same time and the moving speed; control the right robot arm 10 to drive the right robot arm loading device 11, electrode head 12, sensor 9-3 and sensor 9-4 to move at the same time and the moving speed; control the left robot arm loading device 7 and the right robot arm loading device 11 to start or unload; control the start and powder feeding amount of the workpiece printing device 6; regulate the workpiece printing device 6 to perform laser coaxial powder feeding printing or powder laying laser printing; regulate the processing method of the left robot arm loading device 7, the right robot arm loading device 11, the electrode wheel 8 and the electrode head 12 to manufacture the workpiece by additive manufacturing, and the processing method is an in-situ stepping or in-situ continuous processing method.

[0039] Example 1

[0040] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform laser coaxial powder feeding printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot 5 to drive the workpiece printing device 6 to move above the printing substrate 4, move the right robot 10 to drive the right robot loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move simultaneously above the printing substrate 4 and to the right side of the workpiece printing device 6, and then, under the protection of the inert gas provided by the gas source 15, the left robot 5 drives the workpiece printing device 6 to move 250 mm to the left at a speed of 8 mm / s, while the gas source 15 generates an argon gas flow to spray TC4 powder onto the printing substrate 4, and at the same time, the workpiece printing device 6 generates a laser with a power of 1750 W to melt the TC4 powder and solidify it to form the first layer of additive manufacturing TC4 workpiece;

[0041] (2) Repeat step (1) to print 59 layers of additively manufactured TC4 workpieces on top of the first layer of additively manufactured TC4 workpiece to obtain additively manufactured workpiece 1, the right robot arm 10 drives the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move leftward to the upper right of the additively manufactured workpiece 1, the sensor 9-3 records the height when the electrode head 12 is not used to perform pressurized pulse current treatment on the additively manufactured workpiece 1, the right robot arm loading device 11 applies a force of 225N to make the electrode head 12 fit the additively manufactured workpiece 1, and the additively manufactured workpiece 1 is subjected to the first pulse current treatment to obtain the additively manufactured workpiece 1 after the pressurized pulse current treatment, and then the right robot arm loading device 11 is unloaded, and the sensor 9-4 records the height when the electrode head 12 is used to perform pressurized pulse current treatment on the additively manufactured workpiece 1 The height after the pressurized pulse current treatment, the master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the pressurized pulse current treatment of the additively manufactured workpiece 1 using the electrode head 12, and then performs multiple in-situ stepping treatments on the additively manufactured workpiece 1 after the pressurized pulse current treatment, until the in-situ stepping treatment of the additively manufactured TC4 workpiece 2 is obtained after the entire upper surface of the additively manufactured workpiece is processed, and each in-situ stepping treatment is as follows: the right robotic arm 10 drives the right robotic arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move 5mm to the left, and then the right robotic arm loading device 11 applies a force of 225N to make the electrode head 12 fit the additively manufactured workpiece, and then after the pressurized pulse current treatment of the additively manufactured workpiece, the right robotic arm loading device 11 is unloaded;

[0042] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing laser coaxial powder feeding to print the next layer according to the height change in step (2), printing a layer of additively manufactured TC4 workpiece on the additively manufactured TC4 workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ step-processed additively manufactured TC4 workpiece 4;

[0043] (4) processing the in-situ step-processing additively manufactured TC4 workpiece 4 times according to the processing method of step (3) to obtain the in-situ step-processing additively manufactured TC4 workpiece;

[0044] The pulse current treatment described in step (2) is as follows: the current is 8 kA, the voltage is 2.5 V, the frequency is 500 Hz, and the treatment time is 0.8 s.

[0045] The microstructure of the additively manufactured TC4 workpiece obtained by the prior art is a coarse full martensite structure, the residual stress generated by rapid cooling is large, and there are many hole defects inside (attached Figure 4a), its tensile strength is 989MPa and its elongation is 8.7%. After conventional heat treatment (800℃ for 1 hour), the microstructure of the additively manufactured TC4 workpiece is a lath α+β structure, the structure is coarse, the hole defects are not eliminated, the tensile strength is 912MPa, and the elongation is 11.1%. In the in-situ step-strengthening additively manufactured TC4 workpiece obtained in Example 1, the short-term pulse current treatment refines the martensitic laths, releases the residual stress caused by rapid cooling, and the coupling effect of current and force eliminates some hole defects (attached Figure 4 b), so that the strength and plasticity of the workpiece are improved at the same time. The tensile strength of the in-situ step-strengthening additively manufactured TC4 workpiece is 1049MPa, and the elongation is 12.2%. As can be seen from Table 1, compared with the additively manufactured TC4 workpiece, the tensile strength of the additively manufactured TC4 workpiece after heat treatment is reduced by 77MPa, and the plasticity is increased by 2.4%. The in-situ step-strengthening additively manufactured TC4 workpiece obtained in Example 1 has a tensile strength of 60MPa higher than that of the additively manufactured TC4 workpiece, and the plasticity is increased by 3.5%, breaking the technical bottleneck that the strength and plasticity of the additively manufactured workpiece are difficult to improve simultaneously. The device breaks through the barriers of the prior art that it is difficult to eliminate the residual stress and internal hole defects of the additively manufactured workpiece, and it is difficult to simultaneously improve the strength and plasticity of the additively manufactured workpiece. The processing process of this method is carried out simultaneously with the additive manufacturing process, which shortens the processing time and improves the processing efficiency. Table 1 Mechanical properties of the additively manufactured TC4 workpiece, the additively manufactured TC4 workpiece after heat treatment, and the in-situ step-strengthening additively manufactured TC4 workpiece

[0046] Processing Status Tensile strength(MPa) Elongation Additive manufacturing TC4 workpiece 989 8.7％ Additively manufactured TC4 workpiece after heat treatment 912 11.1％ In-situ step-through additive manufacturing of TC4 workpieces 1049 12.2％

[0047] Example 2

[0048] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform powder laser printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robotic arm 5 to drive the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the top of the printing substrate 4 at the same time, and then under the protection of the inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the 42CrMo steel powder on the printing substrate 4, and then the left robotic arm 5 drives the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move 200 mm to the left at a speed of 10 mm / s, and at the same time, the workpiece printing device 6 generates a laser with a power of 1800 W to melt the 42CrMo steel powder and solidify it to form the first layer of additive manufacturing 42CrMo steel workpiece;

[0049] (2) Repeat step (1) to print 79 layers of additively manufactured 42CrMo steel workpiece on the first layer of additively manufactured 42CrMo steel workpiece to obtain additively manufactured workpiece 1. The left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the upper right of the additively manufactured workpiece 1 at the same time. After the sensor 9-1 records the height of the additively manufactured workpiece 1 when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, the left robot arm loading device 7 applies a force of 200N to tighten the electrode wheel 8. Closely fit the additive manufacturing workpiece 1, then perform rolling pressurized pulse current treatment on the upper surface of the additive manufacturing workpiece 1 at a speed of 8mm / s, obtain the in-situ continuously processed additive manufacturing workpiece 2 after the entire upper surface of the additive manufacturing workpiece 1 is processed, and then unload the left robot arm loading device 7, the sensor 9-2 records the height of the additive manufacturing workpiece 1 after the rolling pressurized pulse current treatment is performed by the electrode wheel 8, and the master control device 14 calculates the height change of the additive manufacturing workpiece 1 before and after the rolling pressurized pulse current treatment is performed by the electrode wheel 8;

[0050] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing powder laser printing of the next layer according to the height change of step (2), printing a layer of additively manufactured workpiece on the in-situ continuously processed additively manufactured 42CrMo steel workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ continuously processed additively manufactured 42CrMo steel workpiece 4;

[0051] (4) processing the in-situ continuous processing additively manufactured 42CrMo steel workpiece 4 times in a cycle according to the processing method of step (3) to obtain an in-situ continuous strengthening additively manufactured 42CrMo steel workpiece;

[0052] The pulse current treatment described in step (2) is as follows: the current is 7 kA, the voltage is 3 V, the frequency is 1000 Hz, and the treatment time is 25 s.

[0053] The microstructure of the 42CrMo steel workpiece manufactured by the prior art additive manufacturing is a coarse martensitic structure and a small amount of carbides. Rapid cooling causes a large residual stress in the matrix, and there are many hole defects in the matrix. The tensile strength is 763MPa and the elongation is 16.2%. After conventional heat treatment (quenching after 850℃ insulation for 40 minutes + air cooling after 600℃ insulation for 1 hour), micron-sized carbides are precipitated in the 42CrMo steel workpiece manufactured by additive manufacturing, with a tensile strength of 824MPa and an elongation of 14.3%. The microstructure of the in-situ continuous strengthening additive manufacturing 42CrMo steel workpiece obtained in Example 2 is a refined martensitic lath and submicron-sized fine carbides. At the same time, the coupling of current and force eliminates residual stress and some hole defects, so that the strength and plasticity of the workpiece are improved at the same time. The tensile strength of the in-situ continuous strengthening additive manufacturing 42CrMo steel workpiece is 877MPa and the elongation is 19.5%. As can be seen from Table 2, compared with the additively manufactured 42CrMo steel workpiece, the tensile strength of the additively manufactured 42CrMo steel workpiece after heat treatment is increased by 61MPa, and the plasticity is reduced by 1.9%, while the in-situ continuous strengthening additively manufactured 42CrMo steel workpiece obtained in Example 2 has a tensile strength of 114MPa and a plasticity of 3.3% higher than that of the additively manufactured 42CrMo steel workpiece, breaking the technical bottleneck that the strength and plasticity of the additively manufactured workpiece are difficult to improve simultaneously. The device breaks through the barriers that the prior art is difficult to eliminate the residual stress and internal hole defects of the additively manufactured workpiece, and it is difficult to simultaneously improve the strength and plasticity of the additively manufactured workpiece. The processing process of the method is carried out simultaneously with the additive manufacturing process, shortening the processing time and improving the processing efficiency. At the same time, the device can strengthen the entire additively manufactured metal workpiece in situ layer by layer, breaking through the barriers that the prior art can only perform shallow processing on the surface of the additively manufactured metal workpiece.

[0054] Table 2 Mechanical properties of additively manufactured 42CrMo steel workpieces, additively manufactured 42CrMo steel workpieces after heat treatment, and in-situ continuous strengthening additively manufactured 42CrMo steel workpieces

[0055] Processing Status Tensile strength(MPa) Elongation Additive manufacturing of 42CrMo steel workpiece 763 16.2％ Heat treatment of additively manufactured 42CrMo steel workpieces 824 14.3％ In-situ continuous strengthening additive manufacturing of 42CrMo steel workpiece 877 19.5％

[0056] Example 3

[0057] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform powder laser printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot 5 to drive the workpiece printing device 6 to move above the printing substrate 4, move the right robot 10 to drive the right robot loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move to the top of the printing substrate 4 and the right side of the workpiece printing device 6 at the same time, and under the protection of the inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the TC17 powder on the printing substrate 4, and then the left robot 5 drives the workpiece printing device 6 to move 200 mm to the left at a speed of 4 mm / s, and at the same time, the workpiece printing device 6 generates a laser with a power of 1700 W to melt the TC17 powder and solidify it to form the first layer of additive manufacturing TC17 workpiece;

[0058] (2) Repeat step (1) to print 69 layers of additively manufactured TC17 workpieces on top of the first layer of additively manufactured TC17 workpiece to obtain additively manufactured workpiece 1, the right robot arm 10 drives the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move leftward to the upper right of the additively manufactured workpiece 1, the sensor 9-3 records the height when the electrode head 12 is not used to perform pressurized pulse current treatment on the additively manufactured workpiece 1, the right robot arm loading device 11 applies a force of 235N to make the electrode head 12 fit the additively manufactured workpiece 1, and the additively manufactured workpiece 1 is subjected to the first pulse current treatment to obtain the additively manufactured workpiece 1 after the pressurized pulse current treatment, and then the right robot arm loading device 11 is unloaded, and the sensor 9-4 records the height when the electrode head 12 is used to perform pressurized pulse current treatment on the additively manufactured workpiece 1 The height after the pressurized pulse current treatment is carried out, the master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the pressurized pulse current treatment is carried out on the additively manufactured workpiece 1 using the electrode head 12, and then performs multiple in-situ stepping treatments on the additively manufactured workpiece 1 after the pressurized pulse current treatment, until the in-situ stepping treatment additively manufactured TC17 workpiece 2 is obtained after the entire upper surface of the additively manufactured workpiece is processed, and each in-situ stepping treatment is as follows: the right robotic arm 10 drives the right robotic arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move 4mm to the left, and then the right robotic arm loading device 11 applies a force of 235N to make the electrode head 12 fit the additively manufactured workpiece, and then after the pressurized pulse current treatment is carried out on the additively manufactured workpiece, the right robotic arm loading device 11 is unloaded;

[0059] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing powder laser printing of the next layer according to the height change of step (2), printing a layer of additively manufactured TC17 workpiece on the additively manufactured TC17 workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ step-by-step processed additively manufactured TC17 workpiece 4;

[0060] (4) processing the in-situ step-processed additively manufactured TC17 workpiece 4 times in a cycle 110 times according to the processing method of step (3) to obtain the in-situ step-processed additively manufactured TC17 workpiece;

[0061] The pulse current treatment described in step (2) is as follows: the current is 10 kA, the voltage is 3.5 V, the frequency is 400 Hz, and the treatment time is 0.9 s.

[0062] Example 4

[0063] (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform laser coaxial powder feeding printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot 5 to drive the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the top of the printing substrate 4 at the same time, and under the protection of the inert gas provided by the gas source 15, the left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move 150 mm to the left at a speed of 3 mm / s, while the gas source 15 generates an inert gas flow to spray TA0 powder onto the printing substrate 4, and at the same time, the workpiece printing device 6 generates a laser with a power of 1200 W to melt the TA0 powder and solidify it to form the first layer of additive manufacturing TA0 workpiece;

[0064] (2) Repeat step (1) to print 64 layers of additively manufactured TA0 workpieces on top of the first layer of additively manufactured TA0 workpiece to obtain additively manufactured workpiece 1, the left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the upper right of the additively manufactured workpiece 1 at the same time, and the sensor 9-1 records the height of the additively manufactured workpiece 1 when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, and then the left robot arm loading device 7 applies a force of 115N to make the electrode wheel 8 fit closely to the additively manufactured workpiece 1, and then the upper surface of the additively manufactured workpiece 1 is subjected to rolling pressurized pulse current treatment at a speed of 3mm / s. After the upper surface of the entire additively manufactured workpiece 1 is processed, the in-situ continuously processed additively manufactured workpiece 2 is obtained, and then the left robot arm loading device 7 is unloaded, and the sensor 9-2 records the height of the additively manufactured workpiece 1 after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment, and the master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment on the additively manufactured workpiece 1;

[0065] (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing laser coaxial powder feeding to print the next layer according to the height change in step (2), printing a layer of additively manufactured TA0 workpiece on the additively manufactured TA0 workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ continuously processed additively manufactured TA0 workpiece 4;

[0066] (4) processing the in-situ continuous processing additively manufactured TA0 workpiece 4 80 times according to the processing method of step (3) to obtain the in-situ continuous strengthening additively manufactured TA0 workpiece;

[0067] The pulse current treatment described in step (2) is as follows: the current is 6.5 kA, the voltage is 2.8 V, the frequency is 750 Hz, and the treatment time is 50 s.

[0068] In summary, compared with the prior art, the advantages of the present invention are: the device obtained by the present invention can perform in-situ stepping and in-situ continuous processing on the metal workpiece in the additive manufacturing process layer by layer, and can be synchronized with the additive manufacturing process, saving processing time, reducing processing costs, and significantly reducing the internal hole defects of the additively manufactured workpiece after processing (compared with the prior art, reduced by 90% or more), reducing internal stress, and improving strength and plasticity simultaneously, realizing short-term and efficient repair and toughening of internal hole defects of additively manufactured metal workpieces. The device can perform in-situ strengthening on additively manufactured workpieces of various shapes or sizes, solving the technical difficulties of traditional heat treatment that it is difficult to eliminate internal defects of large-sized metal workpieces, difficult to achieve processing and difficult to improve strength and plasticity simultaneously, and solving the limitations of laser surface treatment, shot peening and other methods that can only process the shallow layer (less than 0.5mm) of the outer surface of additively manufactured metal workpieces, have limited strengthening of large-sized additively manufactured workpieces, and cannot eliminate the internal hole defects of the workpiece. The present invention breaks the technical bottleneck that it is difficult to simultaneously improve the strength and plasticity, wear resistance and corrosion resistance of additively manufactured metal workpieces, and breaks through the barrier that the existing technology can only perform shallow processing on the surface of additively manufactured metal workpieces and is difficult to eliminate internal defects. In addition, the method provided by the present invention is suitable for in-situ strengthening and industrial production of workpieces printed by metal additive manufacturing equipment of various sizes, shapes, and difficult to process. It can be seen from the embodiments of the present invention that the process parameters used in each embodiment are different, and the effects achieved are also significantly different, but the effects achieved are significantly better than the existing technology. This shows that the present invention achieves the best effect through the coordinated regulation of processes and process parameters, and only within the scope of protection of the claims of the present invention can the best effect be achieved.

Claims

1. A metal additive manufacturing device based on in-situ strengthening processing technology, comprising: Host and power distribution system 1, operating table 2, electrode slider 3, printing substrate 4, left robotic arm 5, workpiece printing device 6, left robotic arm loading device 7, electrode wheel 8, sensor 9, right robotic arm 10, right robotic arm loading device 11, electrode head 12, cooling water circulation system 13, master control device 14, air source 15; The host and power distribution system 1 are located at the bottom of the in-situ strengthening treatment technology metal additive manufacturing device, the operating table 2 is fixed above the host and power distribution system 1, the printing substrate 4 is located in the middle position above the operating table 2, the electrode slider 3 includes an electrode slider 3-1 and an electrode slider 3-2, the electrode slider 3-1 and the electrode slider 3-2 are respectively fixed on the operating table 2 and located on the left and right sides of the printing substrate 4, for clamping the printing substrate 4, the left robotic arm 5 and the right robotic arm 10 are respectively installed on the left and right sides above the operating table 2, the other ends of the left robotic arm 5 and the right robotic arm 10 are free moving ends, the workpiece printing device 6 and the left robotic arm loading device 7 are connected to the free moving end of the left robotic arm 5, and can The workpiece printing device 6 is located on the left side of the left robot arm loading device 7, and the electrode wheel 8 is fixed below the left robot arm loading device 7, and can move synchronously with the left robot arm loading device 7. The electrode wheel 8 can rotate, and the right robot arm loading device 11 is fixed to the free moving end of the right robot arm 10, and can move synchronously with the free moving end of the right robot arm 10. The electrode head 12 is fixed below the right robot arm loading device 11 and can move synchronously with the right robot arm loading device 11. There are four sensors, among which sensor 9-1 and sensor 9-2 are fixed at the free moving end of the left robot arm 5, respectively located between the workpiece printing device 6 and the left robot arm loading device 7 and the electrode wheel 8, sensors 9-3 and 9-4 are fixed to the free moving end of the right robotic arm 11, respectively located on the left and right sides of the electrode head 12, the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the four sensors, the right robotic arm loading device 11 and the electrode head 12 are located above the printing substrate 4, the cooling water circulation system 13 is installed below the printing substrate 4, the master control device 14 is located in front of the host and the power distribution system 1, the air source 15 is located on the right side of the host and the power distribution system 1, the air source 15 can generate an inert gas flow, the host and the power distribution system 1 can generate a pulse current and control the pulse current parameters, the left robotic arm 5 can drive ... The device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 move simultaneously above the printing substrate 4, the right robot arm 10 can drive the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move simultaneously above the printing substrate 4, the workpiece printing device 6 can be loaded with the metal powder to be processed, the printing substrate 4 and the metal powder to be processed are the same material, the workpiece printing device 6 can emit laser and transmit powder: the workpiece printing device 6 can be connected to the gas source 15, the gas source 15 can provide the workpiece printing device 6 with an inert gas flow, and the inert gas flow generated by the gas source 15 can spray the metal powder to be processed in the workpiece printing device 6 onto the printing substrate 4,The workpiece printing device 6 can evenly spray a layer of metal powder to be processed on the printing substrate 4. The workpiece printing device 6 can obtain molten metal powder after laser processing the metal powder to be processed on the printing substrate 4. The molten metal powder can quickly solidify to form a part of the additively manufactured workpiece after the workpiece printing device 6 is removed. The workpiece printing device 6 can realize laser coaxial powder feeding printing or powder spreading laser printing. The laser coaxial powder feeding printing is: under the protection of inert gas provided by the gas source 15, the left robotic arm 5 drives the workpiece printing device 6 to move. The workpiece printing device 6 can spray the metal powder to be processed onto the printing substrate 4 along the moving path, and at the same time emit laser to melt the metal powder to be processed, and then solidify it. A layer of additive manufacturing workpiece is formed along the moving path, and the powder-laying laser printing is as follows: under the protection of inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the metal powder to be processed on the printing substrate 4, and then the left robotic arm 5 drives the workpiece printing device 6 to move, and the workpiece printing device 6 emits a laser to melt the metal powder along the moving path. After the molten metal powder solidifies, a layer of additive manufacturing workpiece is formed along the moving path. The cooling water circulation system 13 can pass cooling water to cool the printing substrate 4 and the additive manufacturing workpiece above. The electrode wheel 8 can apply pressure to the additive manufacturing workpiece and perform rolling pressurized pulse current treatment on the additive manufacturing workpiece in a rolling manner: the left robotic arm loading device 7 can load the electrode wheel 8 Applying a vertical force, the electrode wheel 8 can fit tightly against the upper surface of the additively manufactured workpiece and roll on the surface of the additively manufactured workpiece driven by the left robotic arm 5, the main machine and power distribution system 1, the electrode slider 3-1, the electrode slider 3-2, the printing substrate 4, the additively manufactured workpiece and the electrode wheel 8 can form a pulse current loop, the main machine and power distribution system 1 can generate a pulse current and pass the pulse current into the loop, the electrode head 12 can apply pressure to the additively manufactured workpiece and perform pressurized pulse current treatment on the additively manufactured workpiece: the right robotic arm loading device 11 can apply a vertical force to the electrode head 12, and the electrode head 12 can fit tightly against the upper surface of the additively manufactured workpiece when the right robotic arm loading device 11 applies a vertical force The upper surface of the additively manufactured workpiece, the main machine and distribution system 1, the electrode slider 3-1, the electrode slider 3-2, the printing substrate 4, the additively manufactured workpiece and the electrode head 12 can form a pulse current loop, the sensor 9 is a displacement sensor, the sensor 9-1 can record the height of the additively manufactured workpiece when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, the sensor 9-2 can record the height of the additively manufactured workpiece after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment, the master control device 14 can calculate the height difference of the additively manufactured workpiece before and after the electrode wheel 8 is used to perform rolling pressurized pulse current treatment on the additively manufactured workpiece according to the height changes recorded by the sensors 9-1 and 9-2,The powder feeding amount when the workpiece printing device 6 prints the next layer of the additively manufactured workpiece is adjusted according to the height difference. The sensor 9-3 can record the height of the additively manufactured workpiece when the electrode head 12 is not used to perform pressurized pulse current treatment. The sensor 9-4 can record the height of the additively manufactured workpiece after the electrode head 12 is used to perform pressurized pulse current treatment. The master control device 14 can calculate the height difference of the additively manufactured workpiece before and after the pressurized pulse current treatment of the additively manufactured workpiece using the electrode head 12 according to the height changes recorded by the sensors 9-3 and 9-4, and adjust the powder feeding amount when the workpiece printing device 6 prints the next layer of the additively manufactured workpiece according to the height difference. The master control device 1 4 can control the left robot arm 5 to drive the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move at the same time and the moving speed; control the right robot arm 10 to drive the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move at the same time and the moving speed; control the left robot arm loading device 7 and the right robot arm loading device 11 to start or unload; control the start and powder feeding amount of the workpiece printing device 6; regulate the workpiece printing device 6 to perform laser coaxial powder feeding printing or powder spreading laser printing; control the left robot arm loading device 7, the right robot arm loading device 11, the electrode wheel 8 and the electrode head 12 to process the additive manufacturing workpiece. , 2. The application of a metal additive manufacturing device based on in-situ strengthening treatment technology as described in claim 1 in the field of in-situ treatment of additive manufacturing workpieces, the application includes in-situ stepping and in-situ continuous processing methods, the in-situ stepping processing method is laser coaxial powder feeding printing in-situ stepping processing or powder spreading laser printing in-situ stepping processing, and the in-situ continuous processing method is laser coaxial powder feeding printing in-situ continuous processing or powder spreading laser printing in-situ continuous processing.

3. The application of the metal additive manufacturing device based on the in-situ strengthening treatment technology in the field of in-situ treatment of additive manufacturing workpieces according to claim 2 is characterized by: The laser coaxial powder feeding printing in-situ stepping process is as follows: (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the master control device 14, set the workpiece printing device 6 to perform laser coaxial powder feeding printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot arm 5 to drive the workpiece printing device 6 to move above the printing substrate 4, move the right robot arm 10 to drive the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move simultaneously above the printing substrate 4 and to the right side of the workpiece printing device 6, and then, under the protection of the inert gas provided by the gas source 15, the left robot arm 5 drives the workpiece printing device 6 to move 10-1000 mm to the left at a speed of 0.5-50 mm / s. At the same time, the gas source 15 generates an inert gas to spray the metal powder to be processed onto the printing substrate 4, and at the same time, the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece; (2) Repeat step (1) to print N layers of additive manufacturing workpieces on top of the first layer of additive manufacturing workpiece to obtain additive manufacturing workpiece 1, the right robot arm 10 drives the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move leftward to the upper right of the additive manufacturing workpiece 1, and the sensor 9-3 records the height of the additive manufacturing workpiece 1 when the electrode head 12 is not used to perform pressurized pulse current treatment, and then the right robot arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additive manufacturing workpiece 1, and the additive manufacturing workpiece 1 is subjected to the first pressurized pulse current treatment to obtain the additive manufacturing workpiece 1 after the pressurized pulse current treatment, and then the right robot arm loading device 1 is unloaded, and the sensor 9-4 records the height of the additive manufacturing workpiece 1 after the pressurized pulse current treatment is performed using the electrode head 12 The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the pressurized pulse current treatment is performed on the additively manufactured workpiece 1 by the electrode head 12, and then performs multiple in-situ stepping treatments on the additively manufactured workpiece 1 after the pressurized pulse current treatment, until the in-situ stepping treatment additively manufactured workpiece 2 is obtained after the entire upper surface of the additively manufactured workpiece is processed, and each in-situ stepping treatment is as follows: the right robotic arm 10 drives the right robotic arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move 1-40mm to the left, and then the right robotic arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additively manufactured workpiece, and then after the pressurized pulse current treatment is performed on the additively manufactured workpiece, the right robotic arm loading device 11 is unloaded, and the N is an integer, and the value range is 0-260; (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing laser coaxial powder feeding to print the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ step-processed additively manufactured workpiece 4; (4) processing the in-situ step-processed additively manufactured workpiece 4 1-590 times according to the processing method of step (3) to obtain an in-situ step-processed additively manufactured workpiece; The pulse current treatment described in step (2) is as follows: the current magnitude is 0.005-45 kA, the voltage magnitude is 1.5-110 V, the frequency is 5-2000 Hz, and the treatment time is 0.001-30 s.

4. The application of the metal additive manufacturing device based on the in-situ strengthening treatment technology in the field of in-situ treatment of additive manufacturing workpieces according to claim 2 is characterized by: The powder-laying laser printing in-situ stepping process is as follows: (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform powder laser printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot 5 to drive the workpiece printing device 6 to move above the printing substrate 4, move the right robot 10 to drive the right robot loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move simultaneously above the printing substrate 4 and to the right side of the workpiece printing device 6, and then, under the protection of the inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the metal powder to be processed on the printing substrate 4, and then the left robot 5 drives the workpiece printing device 6 to move 10-1000 mm to the left at a speed of 0.5-50 mm / s, while the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece; (2) Repeat step (1) to print M layers of additive manufacturing workpieces on top of the first layer of additive manufacturing workpiece to obtain additive manufacturing workpiece 1, the right robot arm 10 drives the right robot arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move to the left to the upper right of the additive manufacturing workpiece 1, the sensor 9-3 records the height of the additive manufacturing workpiece 1 when the electrode head 12 is not used to perform pressurized pulse current treatment, the right robot arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additive manufacturing workpiece 1, and the additive manufacturing workpiece 1 is subjected to the first pressurized pulse current treatment to obtain the additive manufacturing workpiece 1 after the pressurized pulse current treatment, and then the right robot arm loading device 1 is unloaded, and the sensor 9-4 records the height of the additive manufacturing workpiece 1 after the pressurized pulse current treatment using the electrode head 12 The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the pressurized pulse current treatment is performed on the additively manufactured workpiece 1 by the electrode head 12, and then performs multiple in-situ stepping treatments on the additively manufactured workpiece 1 after the pressurized pulse current treatment, until the upper surface of the entire additively manufactured workpiece is processed to obtain the in-situ stepping treatment additively manufactured workpiece 2, each in-situ stepping treatment is as follows: the right robotic arm 10 drives the right robotic arm loading device 11, the electrode head 12, the sensor 9-3 and the sensor 9-4 to move 1-40mm to the left, and then the right robotic arm loading device 11 applies a force of 0.1-2500N to make the electrode head 12 fit the additively manufactured workpiece, and then after the pressurized pulse current treatment is performed on the additively manufactured workpiece, the right robotic arm loading device 11 is unloaded, and the M is an integer, and the value range is 0-265; (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing powder laser printing of the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ step-processed additively manufactured workpiece 4; (4) processing the in-situ step-processed additively manufactured workpiece 4 1-580 times according to the processing method of step (3) to obtain an in-situ step-processed additively manufactured workpiece; The pulse current treatment described in step (2) is as follows: the current magnitude is 0.001-63 kA, the voltage magnitude is 1.8-180 V, the frequency is 8-1900 Hz, and the treatment time is 0.02-35 s.

5. The application of the metal additive manufacturing device based on the in-situ strengthening treatment technology in the field of in-situ treatment of additive manufacturing workpieces according to claim 2 is characterized by: The laser coaxial powder feeding printing in-situ continuous processing is as follows: (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform laser coaxial powder feeding printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robot 5 to drive the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the top of the printing substrate 4 at the same time, and under the protection of the inert gas provided by the gas source 15, the left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move 50-1500 mm to the left at a speed of 0.5-50 mm / s. At the same time, the gas source 15 generates an inert gas flow to spray the metal powder to be processed onto the printing substrate 4, and at the same time, the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece; (2) Repeat step (1) to print X layers of additively manufactured workpieces on top of the first layer of additively manufactured workpieces to obtain additively manufactured workpiece 1. The left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the upper right of the additively manufactured workpiece 1 at the same time. After the sensor 9-1 records the height of the additively manufactured workpiece 1 when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, the left robot arm loading device 7 applies a force of 0.5-3000N to make the electrode wheel 8 fit closely to the additively manufactured workpiece 1, and then the additively manufactured workpiece 1 is subjected to the rolling pressurized pulse current treatment. The upper surface of the workpiece 1 is subjected to rolling pressurized pulse current treatment at a speed of 0.5-50 mm / s. After the upper surface of the entire additively manufactured workpiece 1 is processed, the in-situ continuously processed additively manufactured workpiece 2 is obtained, and then the left robotic arm loading device 7 is unloaded. The sensor 9-2 records the height of the additively manufactured workpiece 1 after the rolling pressurized pulse current treatment using the electrode wheel 8. The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the rolling pressurized pulse current treatment using the electrode wheel 8. The X is an integer, and the value range is 0-255; (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing laser coaxial powder feeding to print the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ continuously processed additively manufactured workpiece 4; (4) processing the in-situ continuous processing additively manufactured workpiece 4 1-800 times according to the processing method of step (3) to obtain an in-situ continuous strengthening additively manufactured workpiece; The pulse current treatment described in step (2) is as follows: the current magnitude is 0.03-58 kA, the voltage magnitude is 0.2-380 V, the frequency is 3-5000 Hz, and the treatment time is 1-3000 s.

6. The application of the metal additive manufacturing device based on the in-situ strengthening treatment technology in the field of in-situ treatment of additive manufacturing workpieces according to claim 2 is characterized by: The powder-laying laser printing in-situ continuous processing is as follows: (1) Turn on the metal additive manufacturing device based on the in-situ strengthening treatment technology, turn on the main machine and the power distribution system 1 and the general control device 14, set the workpiece printing device 6 to perform powder laser printing, pass cooling water into the cooling water circulation system 13, clamp the printing substrate 4 with the electrode slider 3-1 and the electrode slider 3-2, move the left robotic arm 5 to drive the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the top of the printing substrate 4 at the same time, and then under the protection of the inert gas provided by the gas source 15, the workpiece printing device 6 first evenly spreads the metal powder to be processed on the printing substrate 4, and then the left robotic arm 5 drives the workpiece printing device 6, the left robotic arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move 50-1500 mm to the left at a speed of 0.5-50 mm / s, while the workpiece printing device 6 generates a laser with a power of 50-5000 W to melt the metal powder to be processed and solidify it to form a first layer of additive manufacturing workpiece; (2) Repeat step (1) to print Y layers of additively manufactured workpieces on top of the first layer of additively manufactured workpieces to obtain additively manufactured workpiece 1. The left robot arm 5 drives the workpiece printing device 6, the left robot arm loading device 7, the electrode wheel 8, the sensor 9-1 and the sensor 9-2 to move to the upper right of the additively manufactured workpiece 1 at the same time. After the sensor 9-1 records the height of the additively manufactured workpiece 1 when the electrode wheel 8 is not used to perform rolling pressurized pulse current treatment, the left robot arm loading device 7 applies a force of 0.5-3000N to make the electrode wheel 8 fit closely to the additively manufactured workpiece 1, and then the additively manufactured workpiece 1 is subjected to the rolling pressurized pulse current treatment. The upper surface of the workpiece 1 is subjected to rolling pressurized pulse current treatment at a speed of 0.5-50 mm / s. After the upper surface of the entire additively manufactured workpiece 1 is processed, the in-situ continuously processed additively manufactured workpiece 2 is obtained, and then the left robotic arm loading device 7 is unloaded. The sensor 9-2 records the height of the additively manufactured workpiece 1 after the rolling pressurized pulse current treatment using the electrode wheel 8. The master control device 14 calculates the height change of the additively manufactured workpiece 1 before and after the rolling pressurized pulse current treatment using the electrode wheel 8. The Y is an integer, and the value range is 0-270; (3) adjusting the powder feeding amount of the workpiece printing device 6 when performing powder laser printing of the next layer according to the height change in step (2), printing a layer of additively manufactured workpiece on the additively manufactured workpiece 2 obtained in step (2) according to the process and process parameters of step (1) to obtain an additively manufactured workpiece 3, and processing the additively manufactured workpiece 3 according to the process and process parameters described in step (2) to obtain an in-situ continuously processed additively manufactured workpiece 4; (4) processing the in-situ continuous processing additively manufactured workpiece 4 1-850 times according to the processing method of step (3) to obtain an in-situ continuous reinforcement additively manufactured workpiece; The pulse current treatment described in step (2) is as follows: the current magnitude is 0.07-56 kA, the voltage magnitude is 0.8-330 V, the frequency is 15-4500 Hz, and the treatment time is 0.5-2990 s.

7. The use of a metal additive manufacturing device based on in-situ strengthening treatment technology in the field of in-situ treatment of additive manufacturing workpieces according to any of claims 2-6, wherein the metal powder is TC4, TB8, TC17, TA0, TA16, TA18 titanium alloy, AISI420, AISI430 stainless steel, 35CrMo, 42CrMo steel, QT500-7, QT600-3 ductile iron, Ti 50.0 Ni 50.0 、Ti 49.6 Ni 50.4 、Ti 49.2 Ni 50.8 、Ti 48.8 Ni 51.2 or Ti 48.5 Ni 51.5 A type of alloy powder.

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