Imaginary Axis Diamond Sharp Edge Design And Control Of The Mill,

Recently, the application of machine tools with parallel mechanism becomes more and more popular. There are many advantages also disadvantages of the Stewart platform based machine compared with traditional serial mechanism machine. The motions of a virtual axis machine tool are provided by the legs which bear only axial load. Due to its parallel construction, the deflection of the load is thus reduced significantly and legs with small cross section can be used. Moreover, the parallel structure does not accumulate the moving errors of its legs. As a result, the virtual axis machine tools are more rigid, more accurate and can move much faster than that of the conventional machine tools. But the control system of the virtual axis machine tools is much more complicated than that of the conventional machine tools. It is very helpful to using this kind of mechanism to develop new style grinder to realize cutting tools grinding automatically and numerically. In this paper, the author mainly deal with how to design and control the virtual axis drill point grinding machine; a solution of calculating the workspace needed when grinding and the way of controlling the position and orientation of the platform where machine spindle is installed relative to the platform which is immovable and the relationship between the design parameters and grinding parameters of the drill point and the way of calculating the grinding parameters also was presented.To design and control the virtual axis drill point grinding machine, mathematical representation to describe the drill point configuration is badly needed. According to former research, the flank of the conventional twist drill can be modeled as the surface of a cone. The mathematical model can be applied to the design of drill point grinder by examining the relationship between the grinding parameters and the design parameters. The grinding parameters were used to determine the drill fix angle and grinding wheel angle when grinding. By the mathematical model of drill point geometry, the grinding motion equation of drill points can be established. The grinding motion equation specifies the relative motion of the drill and the grinding wheel surface during the drill point grinding process. When the drillpoint revolves about the axis of cone (here the cone is the surface which forms the flank of the drill point to be grinded), the flank is generated.To design the drill point grinding machine, the diameters of the two platforms and the maximum and minimum length of the legs should be decided firstly, secondly, whether the workspace decided by the parameters meet the strut length constraints and the interference restriction of legs must be verified. The position and orientation of the movable platform and the length of each strut of each step when grinding can be calculated and controlled according to the grinding motion equation and the parameters of the grinding machine.