Research On Remanufacturing Technology Of Large CNC Machine Tool

With the rapid development of society and science and technology,the continuous progress of high-tech industries,but the rapid development has also brought us a lot of negative impact.Products are constantly upgrading,waste products are constantly being eliminated,a large number of raw materials and energy are consumed,and a large amount of waste is discharged.Remanufacturing technology is use of various repair technologies to restore the performance of waste products to reach the performance of new products,and even exceed the performance of new products.Machine tool remanufacturing technology is the recycling of waste machine tools,extending the life cycle of machine tools,reducing the consumption of resources,saving the costs of productions,embodying the theme of low carbon,environment protection and green manufacturing.The remanufacturing technology of the machine tools focuses on reusing the old machine tools,advanced processing concepts and technologies are used to recover the performances and machining precision of the machine tools.The performances of remanufacturing machine tools even surpass the original machine tools to extend the service life of machine tools.Machine remanufacturing is different from traditional repairs,more than recycling,but rather a technical study looking at the entire life cycle of machine tools to improve the overall machine tools' machining performances.This paper takes the GCMT2500 large CNC machine tool as an example,The machine tool is designed by our teacher for many years.Firstly,the remanufacturability of the machine tool is evaluated,the evaluation processes of remanufacturing the machine tool parts are presented,remanufacturing evaluation and design of the spindle of the machine tool is provided,which lay the foundation for remanufacturing of machine tool parts.The present status of domestic and foreign machine tools remanufacturing are analyzed,the situation of existing waste machine tools are combined,the remanufacturing scheme,disassembly scheme and cleaning scheme are designed.Secondly,the machine parts are remanufactured from two parts of machinery and electricity,for mechanical parts,the remanufacturing processes of the machine tool spindle are analyzed emphatically,residual life is evaluated,the machine tool spindle repaired by laser cladding technology combine with robot system is used to remanufacture machine spindle,the power head pendulum rod is repaired by arc spraying technology,performance of the repair layer are tested,in order to ensure the future replacement,the type selection of machine tool guide is designed.Finally,accuracy of remanufacturing machine tool is analyzed from two aspects: static accuracy and dynamic accuracy.The methods and results of the accuracy test of the remanufacturing machine tool are provided,and future development of remanufacturing technology is present according to the actual situation.