| With the improvement of bone defect regeneration medical technology,bone graft repair has become the most in-demand graft after blood transfusion.Among them,the unit price of bone repair materials is 2.4 times the price of gold under the same quality,which is called "bone gold" by industry insiders.Biomimetic bone repair based on natural bone is the latest orthopedic medical technology.Among them,porcine femur is the main source of bionic bone repair materials,but there is not yet a complete and scientific set of porcine femur cutting technology and processing equipment.Therefore,the pig femur studied in this paper is Machining technology and machining equipment have brought new hope to orthopaedic surgeons and patients with bone injuries..This article mainly focuses on the problems of low preparation efficiency of bone repair materials(bone particles),low level of automation,low accuracy of bone particles,and poor safety.At the same time,in response to the four aspects of the "14th Five-Year Plan" for people’s life and health,the integration of human life and bone health and intelligent manufacturing,through the design of the mechanical part of the system and the electrical software part,complete the bone repair material(bone particle)saw Development of punching system.And through experimental research and analysis of the influence of processing parameters on cortical bone sawing performance,the optimal processing parameters of bone particles were obtained.The main tasks of this paper are:(1)The research background and significance of the development of highefficiency precision sawing system for bone repair materials(bone particles)are analyzed,and related technologies at home and abroad are introduced and analyzed in detail.Finally,the research content of this article is proposed.(2)Put forward the preparation process of bone particles,design different mechanical structure models according to the functional requirements of bone slice sawing,bone slice feeding,bone particle punching and blanking,and complete the construction of the overall mechanical structure of the system.(3)According to the mechanical design plan and technological process of the system,the hardware and software design of the control system is completed.The hardware design mainly includes: the selection of the main hardware,I/O distribution,and electrical diagram;the software design mainly includes the design of the program flow of the system and the design of human-computer interaction.(4)In order to study the high-efficiency and precision sawing-punching technology of bone particles,a cortical bone sawing test plan was designed,and the genetic algorithm was used to optimize the parameters of the multi-objective low bone damage.The test results show that the lowest temperature is 35.5°C(Tooth pitch8.46 mm,feed speed 35mm/s),maximum temperature 73.8°C(tooth pitch 4.20 mm,feed speed 5mm/s),when the feed speed is 20mm/s,the turning point of bone surface roughness appears,calculated The optimal bone sawing processing parameters are8.46 mm tooth spacing and 33-35mm/s feed speed.(5)Combining the optimal sawing process parameters with the porous punching and blanking process,the test results of the high-efficiency precision sawing-punching technology of bone particles were obtained,and the test results were compared and analyzed with the artificially prepared bone particles.The results show that the diameter error of the bone particles prepared by the sawing and punching system and the artificially prepared bone particles are reduced by 60%,the thickness error is reduced by 92.5%,and the efficiency is increased by 78.2%. |
PDF Full Text Request