On The Study Of The Design And Technic For The Cutting And Feed System On The CNC Lathe Of Noncircular Cross Section Roller

The roll is the most important part of the rolling mill and the most important deforming tool for the work piece. So the shape and the dimension accuracy of the roll are the most important elements for the machining quality of the work piece and can directly affect the rationality of manufacturing technique and economics of products. Non-circular cross-section rollers belong to the non-circular cross-section parts. Owing to their unique complexity of the outer surface contours, high request for precision of size and poor mechanical processing techniques, they have putted forward the very high request towards the dynamic properties of feed system on the CNC machine tool. So how to manufacture non-circular cross-section rollers efficiently and accurately has become one of the hot and knotty issues in the research of mechanical processing about non-circular cross-section parts.Based on the reality of poor processing precision and low processing efficiency of non-circular cross-section parts with the ordinary processing methods, the main task of this paper is to improve the dynamic properties of feed system on the CNC lathe by optimizing its related structure parameters. If this goal can be met by making an in-depth study, the feed system on the CNC lathe will satisfy requirements of production on quick response, high-precision and non-circular cross-section roller varied can be manufactured efficiently and accurately by turning . The main research contents are as follows.1. The data of the outer surface contours of noncircular cross section roller is analyzed and the curve fitting of cross-sectional outlines is obtained. According to the characteristics of the outer surface contours, the method to approximate the contours curve is proposed.2. Double feed systems along the radius are proposed and the motion characteristics of the tool during manufacturing are analyzed concretely in theory at first. Then by the aid of ADAMS which is used for dynamic analysis, the values of the feed parameters of the tool in processing are solved.3. The kinematics matching design of the feed system and the principal axis system is finished and two conclusions are obtained. First, on the condition of satisfying the machining precision, the rotational velocity of the principal axis should be cut down to enlarge the design space of the feed velocity and acceleration. Secondly, when the feed velocity and acceleration get a higher level, the radial feed system should possesses higher stiffness, higher inherent frequency, appropriate damp, lower inertia, minor time constant and minor flexibility deformation.4. The structure model and the dynamics model are built. The dynamic properties of feed system are simulated and analyzed. In addition, the impact on the dynamic properties which structure parameters of the feed system bring is analyzed concretely. The optimization objective functions are carried out and the simulation in relation to the optimization result are given. Simulation results indicate that the dynamic and static performance of the optimized feed system is superior to that of the original form and can meet the demand of production.In sum, the research results of this article are not only applicable to the production of non-circular cross-section rollers, but hold true for the production of all non-circular cross-section parts. So the research results of this paper have certain reference significance and practical utility towards the production of non-circular cross-section parts.