What are the precision indicators of CNC Vertical Lathe?
CNC Vertical Lathe precision indicators are generally divided into: positioning accuracy and repeat positioning accuracy; resolution and pulse equivalent; indexing accuracy. Positioning accuracy refers to the CNC Vertical Lathe table and other moving parts of the actual movement of the position and the command position of the degree of its inconsistent difference is the positioning error. Factors that cause positioning errors include servo systems, inspection systems, feed drives, and rail errors. The positioning error directly affects the dimensional accuracy of the machined part. Repeat positioning accuracy refers to the same mode of operation and conditions, many times to complete the specified operation after the results of the degree of consistency. Repeated positioning accuracy is generally a normal distribution of the chance of error, it will affect the consistency of batch processing parts. Is a very heavy performance index. General CNC Vertical Lathe positioning accuracy of 0.018mm, repeat positioning accuracy of 0.008mm.
Resolution and Pulse Equivalent: Resolution refers to the smallest displacement gap that can be resolved. For the measurement system, the resolution is the smallest displacement that can be measured. For the control system, the resolution is the smallest displacement increment that can be controlled. Pulse equivalent means that the numerical control device does not send a pulse signal, the displacement of the machine displacement components.
Indexing accuracy: indexing accuracy refers to the indexing table in the indexing, the actual rotation angle and the command rotation angle difference. The degree of indexing is the position of the parts that affect the machining of the parts in the space, and also affects the coaxiality of the machining.
The operation of the CNC Vertical Lathe is performed by a power source-drive-actuator or a actuator-actuator. Constitute the transmission chain. During the cutting process, the machined surface is obtained by the relative movement of the tool and the workpiece mounted on the CNC Vertical Lathe according to a certain regularity. Through the cutting edge of the workpiece on the workpiece blank cutting, the blank on the excess metal cut off, so as to obtain the required surface shape. The working surface of the components is mainly flat, cylindrical, conical surface and various forming surfaces. The common surface of the workpiece has a flat surface, a rotating surface, a thread, a gear tooth forming surface. These are linear surfaces, that is, The bus is moved along the other conductor.
CNC Vertical Lathe processing machinery parts of the process, its essence is the formation of parts on the surface of the process, that is, by means of a certain shape of the cutting edge and the cutting edge and the processed surface according to a certain regular motion, the formation of the required Of the bus and wire. As the processing method, tool structure and the shape of the cutting edge is different, the formation of bus and wire methods and the required movement is not the same. Summarize the following four methods:
(1) trajectory method with a pointed turning tool, planer and other cutting tools, the cutting edge and the machined surface for point contact, as shown in Figure 1-1a. The planer moves linearly in the direction of the arrow A1 to form a linear bus. Along the arrow A2 to the curve, that is, the curved wire. Through the bus along the movement of the wire to form the surface to be machined.
(2) Forming method The cutting edge of the cutting tool is made to fit exactly the required bus bar. Processing, without any movement to form the bus, as shown in Figure 1-1b. The tool only need to arrow A1, the direction of the linear movement can be processed surface.