Background: Friction stir welding technology is widely applied in the welding of dissimilar metal materials because of its characteristics of high welding efficiency, low welding process cost, high welding joint strength and reliability, and green environmental protection. The research on the processing methods and working principle of friction stir welding of dissimilar metals is beneficial to improve the mechanical properties of the joint and reduce weld defects. Therefore, the development of reliable friction stir welding technologies for dissimilar metals joining has been paid an increasing attention in recent years. Objective: To satisfy the processing of various dissimilar metals, improve the joint performance and weld defects, friction stir welding has developed bobbin tool friction stir welding and stationary shoulder friction stir welding. Methods: This paper retraces various current representative patents relative to friction stir welding, bobbin tool friction stir welding and stationary shoulder friction stir welding. Results: Through the investigation of a large number of patents on friction stir welding, the main current existing problems such as poor mechanical properties of the joints and defects in the welds are summarized and analyzed. In addition, the development trend of friction stir welding in dissimilar metal welding is also discussed. Conclusion: The research on friction stir welding methods and devices is beneficial to improve the mechanical properties of welded joints and reduce weld defects. More correlative patents will be invented in the future.
Background: Three-dimensional printing technology is widely applied in the medical, aviation, automotive, construction, and consumer goods industries because of its characteristics of forming without mold, not limited by part complexity and fully digitalization control. The control system, a core element of a three-dimensional printer, controls the orderly working procedure of all elements of the printer and plays a vital role in the printing efficiency and printing quality of the three-dimensional printing. Therefore, the development trend of the control system of the three-dimensional printer has been paid increasingly attention. Objective: To obtain the latest technology of 3D printer control system, We are highly motivated to evaluate the existing 3D printer control system in terms of improving printing accuracy and printing efficiency. Without losing the generality of our discussion, the open loop control system and closed loop control system of 3D printer are discussed emphatically. As the conclusion, the future research direction of 3D printer control system is discussed. Methods: This paper reviews the current various representative patents related to the control system of 3D printer. Results: Through investigating a large number of patents on the control system of 3D printer, the closed-loop control system and the opened-loop control system of 3D printer are analyzed, and the development trend of 3D printer control system is discussed. Conclusion: The optimization of the control system of 3D printer is conducive to increasing printing efficiency and printing quality in the 3D printing process. More relevant patents will be invented in the future.
Background: 3D printing technology is widely applied in transportation, industrial equipment, medical, aerospace, and civil industry due to its characteristics of material saving, no model manufacturing, and machinability of complex parts. The mechanical structure of 3D printer mainly includes 3D printer head structure and working platform and plays a major role in the machining efficiency and processing accuracy of the 3D printer. Thus, increasingly attention has been paid to the current trends of the mechanical structure of 3D printers. Objective: To meet the increasing requirements of 3D printing processing efficiency and precision, the mechanical structure of 3D printers, such as 3D print head structure and working platform, needs to be carefully studied, and a feasible mechanical structure of 3D printers should be proposed. Methods: This paper studies various representative patent related to the mechanical structure of 3D printer, analyzes the mechanical structure of 3D printer, and studies the perfect mechanical structure of 3D printer. Results: Through summarizing a lot of patents about the mechanical structure of 3D printers, the main current existing problems such as platform jitter and machining error are summarized and analyzed, a new mechanical structure of 3D printers is proposed. Moreover, the development tendency of the mechanical structure of 3D printers in the future is discussed. Conclusion: The optimization of the mechanical structure of 3D printer is conducive to increasing the machining efficiency and processing accuracy in the 3D printing process. More relevant patents about working platform and 3D printer head will be invented in the future
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