Chongnian Qu*, Shaohua Guo, Xuyan Liu, Zhiguo Zhong, Mingyue Cui and Rongjie Huang Pages 119 - 126 ( 8 )
Background: Guideway is one of the most important parts for precision and force transferring on whole machine tools due to its sliding joint interfaces. Recent researches have found that the stiffness and damping of a guideway joint interface play a very significant role in precision and heavyduty machine tools. The guideway with high stiffness and damping prompts the development of modern CNC machine tools. Recently, various papers and patents have studied different methods and forms to improve the dynamic characteristics of guideway for machine tools.
Objective: The purpose of this study was to design a sliding guideway for machine tools with oilyporous joint interface, and then the experimental setup was introduced in detail to test and verify its mechanical properties. The measuring method ESDOF was also given in the paper.
Methods: In this study, firstly, a novel sliding guideway was designed and introduced in detail. The proportions of the ingredients for the selected iron-based porous material were also given in the paper. Secondly, a measuring method named ESDOF (equivalent single degree of freedom) was adopted to verify the mechanical properties of the designed guideway. The experiments proved that the designed guide has higher stiffness and damping than traditional 45 steel ones. Thirdly, the results of lubrication and low-speed stability of the designed guideway were also proved by experiment.
Results: The designed guide way has more suitable properties for precision and heavy-duty machine tools than rolling guide. The research showed that the oily-porous joint interface had better dynamic characteristics than conventional 45 steel ones, the normal stiffness of the former increased about 50% and the damping increased about 5-6 times. From this study, the guideway with the high stiffness and damping coefficient, better low-speed stability, and lower critical creeping velocity was introduced in details.
Conclusion: In this paper, a proposed sliding guideway for machine tools with the oily-porous joint interface was introduced in detail. Meanwhile, an experimental setup about the designed guideway was also proposed to test and verify its mechanical properties. It was concluded that in static situation, the normal stiffness and damping coefficient increased along with the normal load increased, and the normal stiffness increased obviously due to more lubricant exuded from the porous base. It was also concluded that the designed guideway had better low-speed stability and lower critical creeping velocity than conventional sliding guideway. In general, the sliding guideway with oily-porous joint interface is a novel and beneficial exploration for machine tools and it can be used in heavy-duty machine tools due to its high stiffness and damping merits.
Equivalent single degree of freedom, guiding accuracy, joint interface, oily-porous materials, precision machine tools, sliding guide way.
College of Mechanical and Electronic Engineering, Nanyang Normal University, Nanyang 473061, College of Mechanical and Electronic Engineering, Nanyang Normal University, Nanyang 473061, College of Mechanical and Electronic Engineering, Nanyang Normal University, Nanyang 473061, College of Mechanical and Electronic Engineering, Nanyang Normal University, Nanyang 473061, College of Mechanical and Electronic Engineering, Nanyang Normal University, Nanyang 473061, College of Mechanical and Electronic Engineering, Nanyang Normal University, Nanyang 473061