CN215090702U - System for manufacturing deposition tissue by laser additive through ultrasonic rolling regulation - Google Patents
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- CN215090702U CN215090702U CN202121404001.4U CN202121404001U CN215090702U CN 215090702 U CN215090702 U CN 215090702U CN 202121404001 U CN202121404001 U CN 202121404001U CN 215090702 U CN215090702 U CN 215090702U
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Abstract
The utility model provides a system for regulating and controlling laser additive manufacturing deposition tissues by ultrasonic rolling, which comprises a substrate, a 3D printing system, a powder feeding system and an ultrasonic rolling system; the 3D printing system is used for cladding and forming; the ultrasonic rolling system comprises an ultrasonic controller, an ultrasonic transducer, an amplitude transformer and a rolling head, wherein the amplitude transformer is connected with the ultrasonic transducer and is used for amplifying the output of the ultrasonic transducer; the rolling head is arranged at the bottom of the amplitude transformer and synchronously vibrates along with the vibration of the amplitude transformer; after the 3D printing system finishes printing each layer of cladding layer, the ultrasonic rolling system rolls the cladding layer below the ultrasonic rolling system by preset static pressure. The utility model discloses an ultrasonic rolling process to every layer of cladding layer for the component after printing the completion regardless of surface or inside tissue has all obtained refining and homogenization, reduces roughness, improves microhardness, improves organizational structure, makes the mechanical properties of material obtain very big promotion.
Description
Technical Field
The utility model belongs to the technical field of the vibration material disk, concretely relates to system that deposit tissue was made to supersound roll extrusion regulation and control laser vibration material disk.
Background
The Additive Manufacturing (AM) technology, also called as a 3D printing technology, as a novel manufacturing technology, has the characteristics of low cost, short cycle, high performance and digital manufacturing, is known as a new technology of "revolutionary" in additive manufacturing, and is expected to provide a new way for manufacturing complex bearing members of major equipment in national defense and industry.
The laser melting deposition is an additive manufacturing technology based on the basic principle of rapid prototype manufacturing, metal powder is used as a raw material, high-energy laser is used as an energy source, and the metal powder synchronously fed is melted layer by layer, rapidly solidified and deposited layer by layer according to a preset scanning path, so that the direct manufacturing of metal parts is realized. Due to the special metallurgical process (the supernormal metallurgical environment with rapid heating and rapid cooling exists in the process), the problems of obvious columnar crystal, uneven structure and the like are easily generated in the structure. Around this problem, the prior art has conducted a great deal of exploratory research, which attempts to solve the problem of metallurgical structure in additive manufacturing from the additive manufacturing process itself, the addition of reinforcing particles to refine grains, and the regulation and control of microstructure by means of magnetic field and electric field.
The metallurgical structure is improved to a certain extent by regulating and controlling additive manufacturing process parameters. The prior art attempts to reduce the size of columnar crystals by controlling the forming process parameters and the subsequent heat treatment process. For example, P.A. Kobryn et Al studied the generation rule of columnar crystal of Ti-6Al-4V alloy laser cladding, and the results showed thatThe temperature gradient and the large cooling rate are beneficial to the growth of the columnar crystal, and the high scanning speed can reduce the size of the columnar crystal. But the control by the process is that the tissue regulation and control are carried out from the angle of supercooling degree, high-energy heat sources such as additive manufacturing laser, electron beams and the like are heated, and the solidification rate is 0.1ms-1To 5ms-1The temperature gradient is already at a very high level, and fine grain strengthening is difficult to realize through process parameter adjustment.
Research on the method that stainless steel (316L) is subjected to ultrasonic rolling and pulse current processing, the surface roughness of a processed component is reduced from micron level to nanometer level, namely Ra is reduced from 3.5 mu m to 37 nm; the defects of internal holes, looseness, microcracks and the like are obviously reduced, and the matrix becomes more compact; in addition, the plastic deformation of the treated surface strengthening layer is more severe, a nano strengthening structure is formed on the outermost layer, the depth of an action layer is also improved, and the surface microhardness of the component is improved. However, the process of ultrasonic rolling and pulse current treatment is complicated, and when the process is applied to the combination of pulse current and ultrasonic rolling, the improvement effect of the pulse current on the internal tissues is not ideal under the condition of rolling.
In addition, zeitz et al studied that a grain refinement layer of about 300um thickness was generated on the surface of the material by ultrasonic rolling treatment, but the refinement of the microstructure was limited to the surface only, and only the mechanical properties of the surface were improved. In these studies, ultrasonic treatment is used as a post-treatment process after the workpiece is formed, and surface treatment is achieved, which can only change or improve the quality of the surface and near surface of the workpiece, but has little influence on the improvement of the internal structure, and the farther from the surface layer, the smaller the influence of ultrasonic rolling, and the poorer the grain refining effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at producing the inhomogeneous scheduling problem that the column crystalline substance is showing, is organized easily to laser melting deposition process tissue, provides a system that supersound roll extrusion regulation and control laser melting deposition tissue, aims at through supersound roll extrusion processing, shows to promote the performance that uses laser melting deposition to make zero component, realizes component mechanical properties and fatigue life's improvement, solves the metallurgical structure problem of laser melting deposition.
The utility model provides a system for ultrasonic rolling regulation and control laser vibration material disk sedimentary tissue, which comprises a base plate, a 3D printing system, a powder feeding system and an ultrasonic rolling system;
the powder feeding system is used for conveying metal powder to the substrate;
the 3D printing system is used for cladding and forming metal powder on the substrate by a set printing program and printing a workpiece in a layer-by-layer printing mode;
the ultrasonic rolling system comprises an ultrasonic controller, an ultrasonic transducer, an amplitude transformer and a rolling head, wherein the ultrasonic controller is used for driving the ultrasonic transducer, the ultrasonic transducer is used for generating ultrasonic vibration output, and the amplitude transformer is connected with the ultrasonic transducer and is used for amplifying the output of the ultrasonic transducer; the rolling head is arranged at the bottom of the amplitude transformer and synchronously vibrates along with the vibration of the amplitude transformer;
wherein: the ultrasonic rolling system is arranged to be integrally assembled on a control platform, and the control platform is arranged to drive the ultrasonic rolling system to roll towards the cladding layer below the ultrasonic rolling system with preset static pressure after the 3D printing system finishes printing each cladding layer, so that static pressure mechanical energy and amplified vibration mechanical energy are simultaneously and directly applied to the cladding layer in contact with the rolling head.
Preferably, the control platform is configured to be installed a predetermined number of times to complete the rolling of each cladding layer.
Preferably, the control platform is a robotic arm or a robot.
Preferably, the 3D printing system is a powder feeding type 3D printing system, or a wire feeding type 3D printing system.
From this, through the utility model discloses a system and method of supersound roll extrusion regulation and control laser vibration material disk deposition tissue at printing the in-process, every printing one deck all carries out supersound roll extrusion processing, with the means that supersound roll extrusion processing was in coordination and was regulated and control as internal organization for the component after the printing was accomplished regardless of surface or inside tissue has all obtained refining and homogenization, reduces surface roughness, improves microhardness, improves organizational structure etc. can make the mechanical properties of material obtain very big promotion.
Drawings
FIG. 1 is a schematic diagram of an exemplary laser melt deposition process ultrasonic rolled tissue conditioning system of the present invention;
FIG. 2 is a schematic process flow diagram of an exemplary laser melt deposition process ultrasonic rolled tissue conditioning system of the present invention;
fig. 3 is a schematic diagram of an example TC4 alloy component, and the length, width and height of the printed workpiece are 80mm by 20mm by 10 mm.
Fig. 4 is a schematic diagram showing the contrast of the tissues and surfaces before and after ultrasonic rolling according to an example of the present invention.
Detailed Description
For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.
With reference to fig. 1-4, an exemplary embodiment of the present invention provides a system for laser additive manufacturing deposition structures by ultrasonic rolling, which includes a substrate 10, a 3D printing system 20, an ultrasonic rolling system 30, and a powder feeding system 40.
The 3D printing system 30 is a powder feeding type 3D printing system, or a wire feeding type 3D printing system.
In the example shown in fig. 1, a coaxial powder feeding laser cladding 3D printing system is taken as an example. Wherein reference numeral 21 denotes a laser cladding head.
The powder feeding system 40 may use a commercially available multi-channel powder feeder to feed powder, especially metal powder (e.g., titanium alloy powder TC4, high temperature alloy powder, etc.), to the surface of the substrate 10 via the laser cladding head by means of coaxial powder feeding to form the powder spot. The laser cladding head 21 forms a laser spot on the substrate. The 3D printing system 20 performs cladding molding on the metal powder on the substrate according to a set printing program, and prints the workpiece in a layer-by-layer printing manner until the entire workpiece is printed.
The ultrasonic rolling system 40 comprises an ultrasonic controller 31, an ultrasonic transducer 32, an amplitude transformer 33 and a rolling head 34, wherein the ultrasonic controller 31 is used for driving the ultrasonic transducer, the ultrasonic transducer 32 is used for generating ultrasonic vibration output, and the amplitude transformer 33 is connected with the ultrasonic transducer 32 and is used for amplifying the output of the ultrasonic transducer; the rolling head 34 is installed at the bottom of the horn 33 and is vibrated synchronously with the vibration of the horn, whereby the vibration treatment and the rolling treatment are simultaneously performed on each cladding layer 100 by the horn 33 and the rolling head 34 while achieving the refinement improvement of the surface and the grain refinement improvement of the inside.
Wherein the ultrasonic rolling system 40 is configured to be integrally mounted on a control platform (not shown) configured to drive the ultrasonic rolling system to roll the cladding layer 100 therebelow with a preset static pressure after the 3D printing system completes printing of each cladding layer, so that the static pressure mechanical energy and the amplified vibration mechanical energy are simultaneously and directly applied to the cladding layer in contact with the rolling head.
In fig. 1, reference numeral 22 denotes a laser beam, and reference numeral 200 denotes a molten pool.
Preferably, the control platform is configured to be installed a predetermined number of times to complete the rolling of each cladding layer. Wherein, the rolling times are 2 to 8 times.
Preferably, the control platform is a robotic arm or a robot.
Preferably, the hydrostatic pressure of the rolling is 100N-700N. The ultrasonic vibration frequency of the ultrasonic controller 31 is 20-50 KHz; the amplitude of the horn 33 is 5-20 um.
In an alternative embodiment, the roller head 34 employs balls, the roller head having a ball diameter of 5-15 mm. For the convenience of connection, a tool head 35 is arranged between the ball and the amplitude transformer, the ball is positioned at the lower end of the tool head, and the upper end of the tool head is connected with the amplitude transformer and vibrates synchronously with the amplitude transformer.
With reference to fig. 2-4, based on the system shown in fig. 1, the present invention provides an exemplary method for manufacturing a deposited tissue by laser additive manufacturing using ultrasonic rolling and regulation, comprising the following steps:
step 1: setting additive manufacturing process parameters according to a workpiece and programming a printing program, wherein the additive manufacturing process parameters comprise a powder feeding process and a laser cladding process;
step 2: printing the alloy powder fed into the surface of the substrate layer by layer according to a printing program until the whole workpiece is printed;
wherein, in the printing process of each layer, the ultrasonic rolling treatment is carried out on the formed cladding layer, namely: and under the ultrasonic vibration environment, the formed cladding layer is synchronously rolled by the rolling head, and the mechanical vibration generated by ultrasonic vibration and the mechanical deformation generated by the rolling treatment simultaneously act on the position of the cladding layer contacted by the rolling head.
Preferably, thinning and homogenization are achieved by ultrasonic rolling treatment of each cladding layer while improving the surface and internal texture of the printed workpiece.
Preferably, in the ultrasonic rolling process of each cladding layer, rolling is performed for a set number of times at a preset static pressure, so that the deformation amount of the cladding layer reaches a preset proportional value.
Preferably, the deformation amount of each cladding layer is controlled in the range of 3% -15%.
Preferably, the ultrasonic transducer and a horn arranged below the ultrasonic transducer form an ultrasonic vibration mechanism, the rolling head is connected with the horn and is arranged below the horn, and in the process of performing ultrasonic rolling on each layer of cladding layer, the vibration mechanical energy of the horn and the pressing mechanical energy pressed by the rolling head act on the position of the cladding layer contacted by the rolling head simultaneously.
In the following, we will more specifically describe the implementation of the method for improving the alloy structure in the laser melting deposition process by combining with the specific embodiments, and through the combination with the ultrasonic and rolling technology, the method improves the defect problem of the laser melting deposition structure, refines and homogenizes the structure, realizes the regulation and control of the structure, and improves the mechanical properties of the printed workpiece.
In the following examples, the metal powder is exemplified by titanium alloy powder TC4, and the size length and width of the print workpiece is exemplified by 80mm by 20mm by 10 mm. The metal material is not limited to the titanium alloy powder. The specific technological parameters of the used materials can adopt corresponding technologies according to different alloy types.
[ example 1 ]
(1) Drying TC4 titanium alloy powder, fully mixing and stirring the dried TC4 powder, putting the mixture into an LDM powder feeder, and setting a powder feeding process; optionally, argon protective gas is conveyed while powder is conveyed;
(2) and using the processed alloy powder for additive manufacturing, setting laser cladding parameters, printing the additive manufacturing component by adopting a powder feeding process, and stopping printing after the first layer is printed to obtain a TC4 cladding layer. The powder feeding speed is 4.5g/min, the powder feeding air flow is 8L/min, the laser power is 1200W, the scanning speed is 10mm/s, the scanning distance is 1.6mm, and the oxygen content is 200 ppm;
(3) after printing is stopped, carrying out ultrasonic rolling treatment on the cladding layer formed in the step (2), wherein the set ultrasonic vibration frequency in the treatment process is 20KHz, the static pressure is 150N, the amplitude of a processing head is 10um, the rolling frequency is 4 times, and the diameter of a ball is 8 mm; the deformation amount of the cladding layer is controlled to be 5 percent;
(4) repeating the steps (2) and (3), printing layer by layer and carrying out ultrasonic rolling processing on each printed layer until the whole component (80 multiplied by 20 multiplied by 10mm) is printed;
(5) after the box sealing printing is finished, opening the cabin door and taking out the components after the components are completely cooled (3-4 hours).
Sampling to measure the surface roughness and the surface hardness of the TC4 titanium alloy component, observing the microstructure of the titanium alloy component and measuring the mechanical property of the titanium alloy component.
[ example 2 ]
(1) Drying TC4 titanium alloy powder, fully mixing and stirring the dried TC4 powder, putting the mixture into an LDM powder feeder, and setting a powder feeding process; optionally, argon protective gas is conveyed while powder is conveyed;
(2) and using the processed alloy powder for additive manufacturing, setting laser cladding parameters, printing the additive manufacturing component by adopting a powder feeding process, and stopping printing after the first layer is printed to obtain a TC4 cladding layer. The powder feeding speed is 4.5g/min, the powder feeding air flow is 8L/min, the laser power is 1200W, the scanning speed is 10mm/s, the scanning interval is 1.6mm, and the oxygen content is 200 ppm.
(3) After the printing is stopped, carrying out ultrasonic rolling treatment on the cladding layer formed in the step (2), wherein the set ultrasonic vibration frequency in the treatment process is 30KHz, the static pressure is 300N, the amplitude of a processing head is 10um, the rolling frequency is 4 times, and the diameter of a ball is 8 mm; the deformation amount of the cladding layer is controlled to be 5 percent;
(4) repeating the printing and ultrasonic rolling processing step by step (2) and (3), wherein the ultrasonic rolling processing is carried out on each printed layer until the whole component is printed;
(5) after the box sealing printing is finished, opening the cabin door and taking out the components after the components are completely cooled (3-4 hours).
Sampling to measure the surface roughness and the surface hardness of the TC4 titanium alloy component, observing the microstructure of the titanium alloy component and measuring the mechanical property of the titanium alloy component.
[ example 3 ]
(1) Drying TC4 titanium alloy powder, fully mixing and stirring the dried TC4 powder, putting the mixture into an LDM powder feeder, and setting a powder feeding process; optionally, argon protective gas is conveyed while powder is conveyed;
(2) and using the processed alloy powder for additive manufacturing, setting laser cladding parameters, printing the additive manufacturing component by adopting a powder feeding process, and stopping printing after the first layer is printed to obtain a TC4 cladding layer. The powder feeding speed is 4.5g/min, the powder feeding air flow is 8L/min, the laser power is 1200W, the scanning speed is 10mm/s, the scanning distance is 1.6mm, and the oxygen content is 200 ppm; the deformation amount of the cladding layer is controlled to be 5 percent;
(3) after printing is stopped, carrying out ultrasonic rolling treatment on the cladding layer formed in the step (2), wherein the set ultrasonic vibration frequency in the treatment process is 40KHz, the static pressure is 450N, the amplitude of a processing head is 10um, the rolling frequency is 4 times, and the diameter of a ball is 8 mm;
(4) and (3) repeating the printing and ultrasonic rolling treatment layer by layer, wherein the ultrasonic rolling treatment is carried out when one layer is printed until the whole component is printed.
(5) After the box sealing printing is finished, opening the cabin door and taking out the components after the components are completely cooled (3-4 hours).
Sampling to measure the surface roughness and the surface hardness of the TC4 titanium alloy component, observing the microstructure of the titanium alloy component and measuring the mechanical property of the titanium alloy component.
[ example 4 ]
(1) Drying TC4 titanium alloy powder, fully mixing and stirring the dried TC4 powder, putting the mixture into an LDM powder feeder, and setting a powder feeding process; optionally, argon protective gas is conveyed while powder is conveyed;
(2) and using the processed alloy powder for additive manufacturing, setting laser cladding parameters, printing the additive manufacturing component by adopting a powder feeding process, and stopping printing after the first layer is printed to obtain a TC4 cladding layer. The powder feeding speed is 4.5g/min, the powder feeding air flow is 8L/min, the laser power is 1200W, the scanning speed is 10mm/s, the scanning distance is 1.6mm, and the oxygen content is 200 ppm;
(3) after printing is stopped, carrying out ultrasonic rolling treatment on the cladding layer formed in the step (2), wherein the set ultrasonic vibration frequency is 50KHz, the static pressure is 600N, the amplitude of a processing head is 10um, the rolling frequency is 4 times, and the diameter of a ball is 8 mm; the deformation amount of the cladding layer is controlled to be 5 percent;
(4) repeating the printing and ultrasonic rolling processing step by step (2) and (3), wherein the ultrasonic rolling processing is carried out when each layer is printed until the whole component is printed;
(5) after the box sealing printing is finished, opening the cabin door and taking out the components after the components are completely cooled (3-4 hours).
Sampling to measure the surface roughness and the surface hardness of the TC4 titanium alloy component, observing the microstructure of the titanium alloy component and measuring the mechanical property of the titanium alloy component.
The schematic view of the cladding surface and the internal structure before and after ultrasonic rolling is combined as shown in fig. 4. Seen from the side surface of the section, the surface of the cladding layer before ultrasonic rolling is fish-scale-shaped, the surface of the cladding layer after ultrasonic rolling is approximately in a straight line, and the tissue is more compact and uniform.
The surface roughness and mechanical properties of the TC4 titanium alloy components prepared in examples 1-4 were tested, and the results are shown in the table below. The results show that the stress in each cladding layer and among the multiple cladding layers is improved through ultrasonic rolling treatment on each cladding layer, and the internal deformation of the structure is realized through pressing, so that the grain structure is refined, the mechanical property is improved, and the surface roughness is improved; continuous high-frequency vibration mechanical energy application is realized through high-frequency mechanical vibration directly acting on the cladding layer for many times, opportunity and time are provided for recombination and appreciation of dislocation in the alloy structure, the more reasonable and uniform dislocation structure is formed in the alloy structure, the internal structure is improved, and comprehensive performance is improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.
Claims (9)
1. A system for manufacturing a deposition tissue by laser additive manufacturing through ultrasonic rolling regulation is characterized by comprising a substrate, a 3D printing system, a powder feeding system and an ultrasonic rolling system;
the powder feeding system is used for conveying metal powder to the substrate;
the 3D printing system is used for cladding and forming metal powder on the substrate by a set printing program and printing a workpiece in a layer-by-layer printing mode;
the ultrasonic rolling system comprises an ultrasonic controller, an ultrasonic transducer, an amplitude transformer and a rolling head, wherein the ultrasonic controller is used for driving the ultrasonic transducer, the ultrasonic transducer is used for generating ultrasonic vibration output, and the amplitude transformer is connected with the ultrasonic transducer and is used for amplifying the output of the ultrasonic transducer; the rolling head is arranged at the bottom of the amplitude transformer and synchronously vibrates along with the vibration of the amplitude transformer;
wherein: the ultrasonic rolling system is arranged to be integrally assembled on a control platform, and the control platform is arranged to drive the ultrasonic rolling system to roll towards the cladding layer below the ultrasonic rolling system with preset static pressure after the 3D printing system finishes printing each cladding layer, so that static pressure mechanical energy and amplified vibration mechanical energy are simultaneously and directly applied to the cladding layer in contact with the rolling head.
2. The system of claim 1, wherein the control platform is configured to be installed a predetermined number of times to complete the rolling of each cladding layer.
3. The system for laser additive manufacturing of deposited tissue according to claim 1, wherein the control platform is a mechanical arm or a robot.
4. The system for laser additive manufacturing of sedimentary tissue according to claim 1, wherein the rolling head is a ball.
5. The system for manufacturing the deposition tissue through the ultrasonic rolling and regulating laser additive manufacturing according to claim 4, wherein the diameter of the ball is 5-15 mm.
6. The system for manufacturing sedimentary tissue through ultrasonic rolling and regulating laser additive manufacturing according to claim 1, wherein the preset static pressure is 100N-700N.
7. The system for manufacturing the deposited tissue through the ultrasonic rolling and laser additive manufacturing according to claim 1, wherein the ultrasonic vibration frequency of the ultrasonic controller is 20-50 KHz.
8. The system for manufacturing the deposited tissue through the ultrasonic rolling and laser additive manufacturing method according to claim 1, wherein the amplitude of the horn is 5-20 um.
9. The system for manufacturing the sedimentary tissue through the ultrasonic rolling and material-regulated laser additive manufacturing according to claim 1, wherein the 3D printing system is a powder feeding type 3D printing system or a wire feeding type 3D printing system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113414413A (en) * | 2021-06-23 | 2021-09-21 | 南京工业大学 | Method and system for manufacturing deposition tissue by ultrasonic rolling regulation and control laser additive |
| CN114951702A (en) * | 2022-05-20 | 2022-08-30 | 中国航空制造技术研究院 | Ultrasonic-assisted coaxial composite material in-situ additive manufacturing device |
| CN115972579A (en) * | 2023-01-09 | 2023-04-18 | 南京航空航天大学 | Printing mechanism with following ultrasonic rolling for fiber additive manufacturing |
| CN117102506A (en) * | 2023-08-30 | 2023-11-24 | 江苏大学 | Shape regulation and control method and device for selective melting of ultrasonic rolling composite laser |
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- 2021-06-23 CN CN202121404001.4U patent/CN215090702U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113414413A (en) * | 2021-06-23 | 2021-09-21 | 南京工业大学 | Method and system for manufacturing deposition tissue by ultrasonic rolling regulation and control laser additive |
| CN114951702A (en) * | 2022-05-20 | 2022-08-30 | 中国航空制造技术研究院 | Ultrasonic-assisted coaxial composite material in-situ additive manufacturing device |
| CN115972579A (en) * | 2023-01-09 | 2023-04-18 | 南京航空航天大学 | Printing mechanism with following ultrasonic rolling for fiber additive manufacturing |
| CN117102506A (en) * | 2023-08-30 | 2023-11-24 | 江苏大学 | Shape regulation and control method and device for selective melting of ultrasonic rolling composite laser |
| CN117102506B (en) * | 2023-08-30 | 2024-03-12 | 江苏大学 | Shape regulation and control method and device for selective melting of ultrasonic rolling composite laser |
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