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Factors affecting mold processing accuracy
The quality of the machine depends on the machining quality of the parts and the assembly quality of the machine. The machining quality of the parts includes the machining accuracy of the parts and the surface quality. The machining accuracy refers to the actual geometric parameters (size, shape and position) and the ideal geometry after the parts are processed. The degree to which the parameters match. The difference between them is called machining error. The size of the machining error reflects the level of machining accuracy. The greater the error, the lower the machining accuracy, and the smaller the error, the higher the machining accuracy.
The main aspects that affect machining accuracy;
1Dimensional accuracy
refers to the degree of conformity between the actual size of the processed part and the center of the tolerance zone of the part size.
The dimensional accuracy is controlled by the dimensional tolerance. The dimensional tolerance is the allowable amount of variation in the size of the part in the cutting process. In the case of the same basic size, the smaller the dimensional tolerance and the higher the dimensional accuracy.
2Shape accuracy
refers to the degree of conformity between the actual geometry of the surface of the processed part and the ideal geometry. There are 6 items for evaluating shape accuracy, such as straightness, flatness, roundness, cylindricity, and line profile. The shape accuracy is controlled by the shape tolerance. The shape tolerances are divided into 12 accuracy levels except for the roundness and cylindricity divided into 13 accuracy levels. Level 1 is the highest and level 12 is the lowest.
3Position accuracy
refers to the actual position accuracy difference between the relevant surfaces of the parts after processing. There are eight items for evaluating position accuracy: parallelism, perpendicularity, inclination, concentricity, symmetry, position, circular runout, and full runout. The position accuracy is controlled by the position tolerance, and the position tolerance of each item is also divided into 12 accuracy levels.