There are many classifications of mechanical parts in specifications and models. After all, we have many industry classifications. The processing methods of manufacturers are definitely different. It also shows that the production equipment used is different. Look at the packaging industry. The packaging equipment used is the packaging machine. , Or packaging machines, the production of metal, or the production of accessories, it needs to be applied to the processing of mechanical parts.
Machining error refers to the degree of deviation between the actual geometric parameters (geometric size, geometric shape and mutual position) of the parts after machining and the ideal geometric parameters. The degree of agreement between the actual geometric parameters and the ideal geometric parameters of the part after machining is the machining accuracy. The smaller the machining error, the higher the degree of conformity, and the higher the machining accuracy. Machining accuracy and machining error are two formulations of the same problem. Therefore, the size of the machining error reflects the level of machining accuracy.
Positioning error: Positioning error mainly includes fiducial misalignment error and inaccurate manufacturing error of positioning pair. When processing the workpiece on the machine tool, several geometric elements on the workpiece must be selected as the positioning datum during processing. If the positioning datum and the design datum are selected (the datum used to determine a certain surface size and position on the part drawing) ) Does not coincide, it will produce benchmark misalignment error.
Measurement error: When measuring parts during processing or after processing, the measurement accuracy is directly affected by the measurement method, measuring tool accuracy, workpiece, and subjective and objective factors.
Tool error: Any tool will inevitably produce wear during the cutting process, and this will cause the size and shape of the workpiece to change.
Fixture error: The function of the fixture is to make the workpiece equivalent to the tool and the machine tool have the correct position, so the geometric error of the fixture has a great influence on the machining error.
Machine tool error: including spindle rotation error, guide rail error and transmission chain error. Spindle rotation error refers to the variation of the actual rotation axis of the spindle relative to its average rotation axis at each moment, which will directly affect the accuracy of the processed workpiece. The main reasons for the spindle rotation error are the spindle coaxiality error, the bearing itself error, the coaxiality error between the bearings, and the spindle winding. The guide rail is the benchmark for determining the relative positional relationship of various machine tool components on the machine tool, and also the benchmark for machine tool movement. The manufacturing error of the guide rail itself, the uneven wear of the guide rail and the installation quality are important factors that cause the guide rail error. Transmission chain error refers to the error of the relative movement between the transmission elements at both ends of the transmission chain. It is caused by the manufacturing and assembly errors of each component of the transmission chain, as well as the wear during use.
