1. Dimension accuracy:
It refers to the conformity degree between the actual size of the part and the tolerance zone center of the part size after processing. Dimensional accuracy is controlled by dimensional tolerance, which is the allowable variation of part size in machining. When the basic dimensions are the same, the smaller the dimensional tolerance is, the higher the dimensional accuracy is.
2. Shape accuracy:
It refers to the conformity degree between the actual geometry and the ideal geometry of the part surface after processing. There are 6 items to evaluate the shape accuracy, such as straightness, flatness, roundness, cylindricity and line profile. The shape accuracy is controlled by shape tolerance. Except for roundness and cylindricity, all the shape tolerances are divided into 12 Accuracy grades. Grade 1 is the highest and grade 12 is the lowest.
3. Position accuracy:
Refers to the difference of the actual position precision between the surface of the parts after the processing of the daily necessities mold. The items to evaluate the position accuracy include parallelism, verticality, inclination, coaxiality, symmetry, position, circular and full run out. Position accuracy is controlled by position tolerance, and the position tolerance of each project is also divided into 12 accuracy levels.
When designing machine parts and specifying machining accuracy of daily necessities mould, attention should be paid to controlling the shape error within the position tolerance, and the position error should be less than the size tolerance. That is to say, the shape accuracy of precision parts or important surfaces should be higher than the position accuracy, and the position accuracy should be higher than the size accuracy.
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