A brief introduction to the accuracy standard of horizontal lathe machining

A horizontal lathe is a machine tool that mainly uses a turning tool to turn a rotating workpiece. On the lathe, drills, reamers, reamers, taps, dies and knurling tools can also be used for corresponding processing.

The method often used in CNC horizontal lathe control engineering is to first establish a simplified model 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 approximation research method is a common method in engineering. The mathematical model of the CNC horizontal lathe control system is not all rich control systems that can be linearized. For some systems with strong nonlinearity, it is better to use nonlinear research methods to deal with them.

At present, the machining accuracy standards of CNC horizontal lathes formulated by the industry have professional standards for CNC horizontal lathe lifting table machining centers. 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 accuracy is 0.035mm. In fact, the factory accuracy of the machine tool has a considerable margin, which is about 20% smaller than the error value allowed by the industry standard. Therefore, from the perspective of machining accuracy selection, ordinary CNC horizontal lathes can meet the machining needs of most parts. For parts with higher precision requirements, a precision CNC horizontal lathe should be considered.

The CNC horizontal lathe is mainly composed of a headstock, a grinding wheel frame, a tailstock, and a worktable in the production process. The CNC machining bed uses large round holes and shark fin-shaped ribs. After long-term use, the machine tool has good dynamic and static stiffness. The table of CNC horizontal lathe can be divided into upper and lower table to grind the conical surface. The base of the machine tool and the guide rail of the worktable are made of plastic guide rail, with a small friction coefficient. The worktable is directly driven by the servo motor to make the ball screw move, 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 high when used. The grinding head bearing is a three-piece hydrodynamic bearing with a large wrap angle and high rotation accuracy.