Current problems and Countermeasures of 3D printin

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Detailed explanation of the existing problems and Countermeasures in 3D printing remanufacture

Abstract: compared with traditional manufacturing methods, 3D printing has the advantages of material saving, energy saving and forming without being limited by the complexity of parts, so it has attracted wide attention at home and abroad

3d printing compared with traditional manufacturing methods, 3D printing has the advantages of material saving, energy saving and forming is not limited by the complexity of precision parts, so it has been widely concerned at home and abroad. Today, 3D printing technology has been widely used in industry, biomedicine and other industries. The use of 3D printing technology can not only quickly realize the "creation from nothing" of new products, but also quickly realize the "repair from bad" of waste products, improve their performance and prolong their service life, which has very important economic significance

at present, both at home and abroad attach great importance to the application of 3D printing technology in the remanufacture field. The United States has used 3D printing technology to realize the remanufacture of aircraft engine blades, gas turbine engine parts, etc., and plans to apply 3D printing technology to space orbit repair, helping the Phoenix Program of the US Department of defense. China has also conducted in-depth research on 3D printing manufacturing of metal parts and remanufacturing of damaged parts, and has made a series of achievements. However, the application of 3D printing technology in remanufacture is still in its infancy. Next, we discuss the current problems and Countermeasures of D printing remanufacture technology, which has achieved gratifying results

1 3D printing remanufacture and its process

3d printing remanufacture is to use 3D printing technology to remanufacture and repair waste parts, so as to improve their performance and prolong their service life. Its technical process is shown in Figure 1. Scanning of damaged parts reverse seeking digital model of damaged parts model reconstruction of damaged parts CAD model comparison with standard model remanufacture repair model hierarchical path planning remanufacture repair

Figure 1 3D printing remanufacture flow chart of equipment parts

for 3D printing direct manufacturing based on CAD standard model of parts, part models are directly retrieved from the standard model library or quickly designed with 3D modeling software, After slicing the model, the parts can be printed and manufactured. It can be seen from Figure 1 that the acquisition of remanufacture repair model is a complex process. First, the role of the instigation mechanism is to instigate the magnitude of the work absorbed by the experimental sample to obtain the digital model of the waste damaged parts through reverse engineering, then process the digital model, and finally generate the remanufacture repair model by comparing it with the standard model

in fact, due to various factors causing damage to equipment parts, the damage surface of parts is often irregular. In order to achieve in-situ repair of damaged parts, it is also necessary to pretreat the damaged surface. In addition, because the remanufactured repair materials used in the remanufactured repair of damaged parts are different from the base materials of the parts, there are heterogeneous interfaces in the remanufactured repair parts. Therefore, the 3D printing remanufacture and repair of equipment waste and damaged parts is different from the 3D printing direct manufacturing of equipment parts, which involves a wider technical field and a more complex process

2 there are problems in 3D printing remanufacture.

although 3D printing has been successfully applied in remanufacture of equipment parts and components, and achieved good results. However, due to the complexity of the remanufacture process and the immaturity of 3D printing technology, the current 3D printing remanufacture is still in the primary research stage, and there are still many problems to be solved

(1) the acquisition process of remanufacture model is complex and inefficient. In the process of obtaining remanufacturing model, the acquisition and reconstruction of damaged parts' digital model is a reverse engineering problem, while the establishment of damaged parts' CAD model is a forward design problem, which has many problems, such as data processing and file format conversion. The actual steps of obtaining remanufacture model are as follows: the damaged parts are scanned by a 3D scanner to obtain the digital model of the parts (point cloud data model); The point cloud data is imported into reverse engineering software such as Imageware and PolyWorks to deal with the sharp rise of market price in a short time, and the surface model is constructed; The surface model is imported into the forward design software for solid processing and compared with the imported standard part CAD model, and finally the remanufacture repair model is generated

it can be seen that generally, the acquisition of remanufacture model requires the cooperation of three party software. At the same time, the current point cloud data processing and surface model construction operations are completed manually, and the quality of surface model construction is determined by experience. The low degree of integration and automation of the system software directly leads to the low efficiency of obtaining the manufacturing repair model, which greatly reduces the response speed of 3D printing and remanufacturing repair of equipment damaged parts

(2) poor portability. It includes two aspects: first, the reverse scanning equipment for obtaining the digital model of damaged parts still has the problems of complex structure, power supply and poor portability

second, due to the complex system and huge structure of laser equipment, the current mainstream 3D printing and manufacturing technology based on laser has the problems of complex system and poor portability, and can not realize the rapid reverse engineering of damaged part model and rapid remanufacture repair. (3) The technology is relatively simple. At present, the mainstream 3D printing technology is based on laser as the heat source. Although laser has the advantages of concentrated energy and a wide range of forming materials, it also has the disadvantages of expensive and complex system, resulting in high cost of direct manufacturing and remanufacturing of 3D printing and difficult popularization

(4) 3D printing accuracy is relatively low. At present, 3D printing still has the defect of low accuracy. Whether directly manufactured parts or remanufactured repair parts, they can only be used after post-processing

(5) material problems. At present, there are relatively few types of materials used for direct 3D printing of metal parts, resulting in limited types of equipment parts that can be remanufactured and repaired

3 countermeasures

in view of the current problems of 3D printing remanufacture technology, in order to accelerate the realization of rapid and accurate remanufacture support requirements on the battlefield of equipment damaged parts, in the future, 3D printing technology should increase the research and application exploration in the following aspects:

(1) develop a special remanufacture integrated software system with high integration and automation according to the characteristics of battlefield repair requirements of equipment damaged parts. For example, develop a rapid and automatic processing module for point cloud data and surface model construction, a module for automatic matching of CAD model of defective parts and standard parts model, and a module for obtaining remanufacture model. At present, Delcam Integrated System Co., Ltd. and Geomagic software company have launched forward and reverse hybrid design software powershape pro and Geomagic spark respectively, which greatly improves the integration of software system for remanufacturing model acquisition. In addition, in view of the tedious process of constructing surface model from point cloud data, Dalian Maritime University has carried out theoretical research on comparing point cloud data with standard CAD model of parts to generate remanufacture repair model. The point cloud data model can be directly compared with the standard model to obtain the remanufacture model, which can greatly shorten the remanufacture model calculation process, improve the system automation level, and then improve the response speed of 3D printing remanufacture repair of damaged parts

(2) develop desktop 3D printing system to reduce 3D printing remanufacture cost and improve equipment portability to meet the requirements of rapid and accurate support on the field battlefield. At present, the U.S. Army space and missile defense command and the Innovation Office of the future operations center of the Army Strategic Command have developed a lightweight and low-cost 3D printer for battlefield personnel, which can be placed in the backpack of combat personnel and used on the battlefield. Shenzhen Hualang company has developed the fourth generation 3D scanning system. The self weight of the scanner of the system is less than 1kg. During scanning, only a laptop computer, a scanner and a portable charger that supplies power to the scanner are required, without conventional power supply. It is very suitable for field work

(3) in depth research and development of 3D printing technology other than laser. Laser based 3D printing technology has some defects such as expensive system and poor portability. Other types of 3D printing technologies, such as arc deposition, plasma deposition and other 3D printing technologies, should be widely developed. At present, the key national defense science and Technology Laboratory of equipment remanufacture technology has successfully applied 3D printing technology based on welding to remanufacture and repair armored equipment parts. However, compared with laser 3D printing technology, 3D printing technology based on welding has the disadvantages of low precision and poor forming stability, which needs further research. At the same time, we should also intensify the exploration and research of other types of 3D printing technology with high precision and portable equipment

(4) carry out extensive research and development of 3D printing materials. The United States has always attached great importance to the development of 3D printing supporting materials. With the in-depth development of 3D printing technology and the continuous expansion of the demand for printing materials, at present, the research, development and application of 3D printing materials in China are also increasingly concerned. It is reported that at the incremental manufacturing industry high-end forum and laser sintering equipment conference held in october2012, Huashu high tech signed a cooperation agreement with the world-famous laser sintering powder material seller 3D link company of the United States on the application and development project of laser sintering materials, with a view to developing high-performance laser sintering powder materials. The recently established feierkang Rapid Manufacturing Technology Co., Ltd. and Haiyuan 3D printing manufacturing laboratory also set the development of 3D printing materials as a clear goal

(5) make full use of the network platform and vigorously carry out remote 3D printing remanufacture. According to foreign media reports, recently, the U.S. Army Research Laboratory and Purdue University have developed a new 3D printing technology, which can help soldiers deployed at different locations to remotely repair equipment (such as aircraft and automobile) parts, improve military equipment efficiency and significantly reduce maintenance costs. At present, a professional online 3D printing service platform has emerged in China, but the information about Remote 3D printing remanufacture has not been reported yet

in a word, the application of 3D printing technology to the remanufacture and repair of equipment damaged parts can greatly save costs, reduce the inventory of military equipment spare parts, and save national defense expenses. It is of great significance to greatly improve the rapid and accurate support response speed of damaged equipment parts, promote the regeneration of combat effectiveness, and improve the military readiness. With the development and maturity of 3D printing technology, it is believed that 3D printing technology will have a broader application prospect in national defense science and technology, and bring higher military and economic benefits

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