Study On Key Technologies And Applications Of Springback Controlling-oriented In Precision Linear Guide Straightening

Linear guide as a general function component is widely used in the CNC and automatic equipment, directly affecting the accuracy of the manufacturing equipment processing ability. In recent years, with the rapid development of the equipment manufacturing industry, it makes increasing requirement for the flatness of linear guide. The straightening technology is one of the indispensable processes in linear guide complex manufacting, which development is not balanced, and most is still at primary state at present. The precision of guide rail rely mainly on the high precision grinding machine and professional installation. There are great gaps between the automatic, digital and intelligent precision processing and actuality. At the same time, there is the lack of deep and systematic research on the straightening technology processTherefore, this paper focuses on closely the key technologies of straightening process on linear guide, on which theoretical analysis, process equipment, processing principle and process flow with system practice. Main achievements and features in the paper are as follows:(1) The main purpose of the springback control about the elastic and plastic materials straightening technology research methods are proposes. Combining with the elastic-plastic mechanics and material mechanics, taking precision linear guide as research object, starting with the bending curvature of guide rail, the straightening technologies theoretical model have been established whose main purpose to control springback of bending.(2) In order to validate the influence of the linear guide rail after multiple bending loading, the experimental has been designed to analysis the bending properties of guide rail. The novel bending loading method consisting of multi-step loading and corresponding unloading has applied in the three specimens with different cross section shape and different heat treatment condition. According to the result of experimental, by using numerical calculation software program and the numerical simulation with finite element analysis (FEA), the relationships among the maximal load and displacement on cross section shape with each step bend loading, the loading stroke with the heat treatment condition, and the loading stroke with cross section shape are gained, and also those curves are discussed qualitatively. Finally, the contrast result between the numerical simulation and experiment has been carried out to study the influence about the multi-step loading on specimen. It is put forward that enlightenment for the straightening stroke in the precision linear guide rail manufacture process.(3) The springback controlling-oriented prediction model of straightening stroke has been established. Setting specimens as an example, Making a comparison for the straighten process models building by experimental and theory and FEA. According to the advanced relationship model between stroke with deflection, the stroke prediction could be realized and calculation.(4) The problems affecting the accuracy of linear guide straightening, including material parameter identification and straightening loading process have been discussed. Combined with the experiment and the simulation results, the material parameters identification better method is present. The loading method have been analyzed, being contrasted and analyzed by the theoretical calculation of stroke, kinematics simulation and actual loading experiment, which is lay the foundation of further study on improvements on the precision of stroke prediction and straightening loading.(5) The design methods are proposed for the equipment adapting to springback control-oriented linear guide straightening processing, including straightening technologies process, workpiece overlap feed methods and straightening stroke calculation. Based on the methods, the design of the linear guide straightening control system can be divided into two parts, which is hardware and software system. After having analyzed the advantages and disadvantages of compared several realizations, the springback control-oriented straightening processing hardware and software platform have built. Finally, linear guide automation straightening processing prototype and controlling system software have been developed.