Dimensional Accuracy

The degree of conformity between the actual size of the processed parts of the daily necessities mold and the center of the tolerance zone of the part size. Dimensional accuracy is controlled by dimensional tolerances, which are the allowable variations in part dimensions during machining. When the basic dimensions are the same, the smaller the dimensional tolerance, the higher the dimensional accuracy.

Shape Accuracy

The degree to which the actual geometric shape of the processed surface of daily necessities molds matches the ideal geometric shape. The items for evaluating shape accuracy include straightness, flatness, roundness, cylindricity, and line profile. Shape accuracy is controlled by shape tolerances. Except for roundness and cylindricity, which are divided into 13 accuracy levels, the rest are evenly divided into 12 accuracy levels, with level 1 being high and level 12 being low.

Position Accuracy

The actual positional accuracy difference between the surfaces of the processed parts of daily necessities molds. The items for evaluating positional accuracy include parallelism, verticality, inclination, coaxiality, symmetry, positional accuracy, circular runout, and total runout. The positional accuracy is controlled by positional tolerances, and the positional tolerances of each item are also divided into 12 accuracy levels.

When designing machine parts and specifying the machining accuracy of daily necessities molds, attention should be paid to controlling shape errors within positional tolerances, and positional errors should be less than dimensional tolerances. The shape accuracy requirement of precision parts or important surfaces of parts should be higher than the positional accuracy requirement, and the positional accuracy requirement should be higher than the dimensional accuracy requirement.