The positional accuracy of a CNC cylindrical grinder includes the following aspects:
1. Geometric accuracy: Geometric accuracy mainly involves the manufacturing accuracy and assembly accuracy of machine tools. Specifically, it includes the rotational accuracy of the spindle, the flatness of the worktable, the straightness of the guide rail, and the axial and end face runout of the spindle. These precision items directly affect the geometric and positional accuracy of the workpiece.
2. Positioning accuracy: Positioning accuracy refers to the deviation between the actual position and the commanded position of the machine tool worktable or grinding wheel frame under the control of the numerical control system. The influencing factors of positioning accuracy include the geometric accuracy, transmission accuracy, and dynamic characteristics of the electrical system of the machine tool.
3. Repetitive positioning accuracy: Repetitive positioning accuracy refers to the consistency of the movement of the worktable or grinding wheel frame when the CNC cylindrical grinder is repeatedly positioned under the same conditions. It is an important indicator for measuring the repeatability and stability of machine tools. The factors that affect the accuracy of repeated positioning mainly include the geometric accuracy of the machine tool, thermal stability, and stability of the control system.
4. Micro feed accuracy: Micro feed accuracy refers to the accuracy of the worktable or grinding wheel holder performing micro feed again after completing one cutting in a CNC cylindrical grinder. The precision of micro feed directly affects the surface roughness and dimensional accuracy of the workpiece. It requires machine tools to have high-precision transmission and control systems.
To improve the positional accuracy of CNC cylindrical grinders, it is necessary to start from multiple aspects, including improving the geometric accuracy of the machine tool, optimizing control algorithms, strengthening thermal stability and transmission system stability, etc. In addition, proper use and maintenance are also key factors in ensuring positional accuracy.