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Accuracy is one of the important technical indicators o […]
Accuracy is one of the important technical indicators of CNC machine tools. Accuracy mainly refers to machining accuracy, positioning accuracy and repeat positioning accuracy.
The positioning accuracy is the degree of coincidence between the actual moving position of the moving parts such as the index control machine table and the command position, and the inconsistent difference is the positioning error.
The positioning error includes errors such as the servo system, the detection system, the sexual feed system, and the geometric error of the moving component guide rail. Positioning errors will directly affect the positional accuracy of part machining.
Repeated positioning accuracy refers to the degree of consistency of continuous results obtained by processing a batch of parts with the same code in the same program on the same CNC machine.
Repeated positioning accuracy is affected by factors such as servo system characteristics, gap and stiffness of the feed system, and friction characteristics.
Under normal circumstances, repeated positioning accuracy is an accidental error of normal distribution, which affects the consistency of processing of a batch of parts, and is a very important performance index.
The indexing accuracy refers to the difference between the actual turning angle and the commanded turning angle when the indexing table is indexed. The indexing accuracy affects the angular position of the machining part of the part in space, and also affects the coaxiality of the hole machining.
Resolution is the minimum displacement interval 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 minimum displacement increment that can be controlled, that is, the amount of movement that is reflected on the moving parts of the machine tool for each pulse signal sent by the numerical control device. , generally referred to as pulse equivalent. Pulse equivalent is one of the original data of the design of CNC machine tools. The value of the value determines the machining accuracy and surface quality of CNC machine tools. The smaller the pulse equivalent, the higher the machining accuracy and surface quality of the CNC machine tool.