| The era of intelligent manufacturing has arrived,and traditional processing techniques have been unable to meet the requirements of the times.In this era,3D printing technology can fully exert its superiority and become the leader of the times.Meanwhile,3D printing technology also had its own flaws,such as Printing accuracy,printed materials,and manufacturing costs,have always been a bottleneck for 3D printing technology.The mainstream of the market has been gradually occupied by metal 3D printing technology.Based on the above background,FDM printing technology as the blueprint was taken in this paper,from structural design to control system design,a new type of printing equipment was independently developed,which is suitable for 3D printing equipment of polymer metal composite materials.Research work was mainly carried out from the following aspects:Firstly,the mechanical structure of the 3D printing device was designed.In this paper,the mechanical structure was divided into three parts,namely the fuselage,the extrusion system and the transmission mechanism,and the various parts were designed separately.Secondly,key components of the equipment were calculated and selected.ACT17HS5423was selected as the drive motor for XY axis drive.Then according to the mechanical design theory calculation,the 2GT model synchronous wheel was selected,and the 7mm synchronous belt was used.For the Z-axis screw,a normal T-screw with a diameter of 10 mm and a pitch of2 mm was used.Thirdly,the static mechanical simulation analysis of the key components of the equipment showed that the maximum stress of the equipment was 4.49 MPa and the maximum strain was0.028 mm.Then,the modal analysis and the harmonic response analysis were carried.The analysis results showed that the natural frequency of the device was 0-60 Hz,and the maximum displacement of the displacement under the interference excitation was 2.835?10-3 mm.According to the results of finite element analysis,the structure still had a large optimization space.Forth,the hardware circuit board with ATmega2560 as the main controller was developed.For the temperature control module,PID control was adopted.After simulation analysis,To heat to 230°C was taken about 50s for the nozzle,the overshoot was about 4.3%,and the steady state value needed about 160s.A hybrid speed control curve was proposed for the stepping motor by combining the linear speed curve with the exponential speed curve.Finally,On the basis of finite element analysis,the dimensions of the guide rail diameter,the extrusion nozzle base,the width and thickness of the working platform beam were optimized.The results showed that the optimized mass was reduced from 320.54kg to 248.87kg and the weight loss was 22.3%.Strength and stiffness were within in safe working range,structural optimization purposes were achieved.The fuzzy control was added to the original PID control and simulated.The results showed that the response time was reduced from 50s to40s,the overshoot was educed from 4.3%to 2.3%,and the steady-state time was reduced from160s to 130s.The temperature control was optimized. |
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