Accuracy standard of CNC horizontal lathe

The method often used in CNC horizontal lathe control engineering is: first establish a simplified model that is as linear as possible, and then obtain the approximate characteristics of the system on this basis. If necessary, use more complex models for further research. This step-by-step approximate research method is a commonly used method in engineering. The mathematical model of the CNC horizontal lathe control system is not all rich control systems that can adopt linearization processing methods. For some systems with strong nonlinearity, it is better to use nonlinear research methods to deal with them.

The CNC horizontal lathe is mainly composed of grinding wheel frame, head frame, bed, workbench, tail frame and other parts in the production process. The bed of the CNC machining adopts large round holes and shark fin-shaped ribs. After long-term use , The machine tool has good dynamic and static stiffness. The working table of the CNC horizontal lathe can be divided into upper and lower table to grind the conical surface. The machine bed and the guide rail of the working table adopt plastic guide rails, and the friction coefficient is small. The worktable is directly driven by the servo motor to move the ball screw, and the movement is stable and reliable. The linear speed of the grinding wheel of the CNC horizontal lathe is less than 35m/s, and the overall grinding efficiency is relatively high when in use. The grinding head bearing is a three-piece dynamic pressure bearing with a large wrap angle, and the rotation accuracy is high. The movement of the wheel carriage (X direction) is directly driven by the servo motor and the ball screw, with a small resolution of 0.0005mm.

my country has formulated the accuracy standards for CNC horizontal lathes, among which the CNC horizontal lathe lifting table machining center has professional standards. The standard stipulates that the positioning accuracy of its linear motion coordinates is 0.04/300mm, the repeat positioning accuracy is 0.025mm, and the milling precision is 0.035mm. In fact, the factory precision of the machine tool has a considerable reserve, which is about 20 less than the allowable error value of the national standard. Therefore, from the perspective of accuracy selection, the general CNC horizontal lathe can meet the processing needs of most parts. For parts with higher precision requirements, a precision CNC horizontal lathe should be considered.

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