When processing plastic molds, in order to improve the accuracy of the mold. First of all, it is necessary to know which aspects affect the processing accuracy of plastic molds.
1. Dimensional accuracy.
It is used to indicate the degree of matching between the actual size of the workpiece being machined and the center of the tolerance zone.
Dimensional tolerances are used to control dimensional accuracy. Dimensional tolerance is the allowable variation in part size during cutting. When the basic dimensions are the same, the smaller the dimensional tolerance, the higher the dimensional accuracy.
2. Shape accuracy.
The actual geometry of the machined part surface corresponds to the desired geometry. There are six items for evaluating shape accuracy: straightness, flatness, roundness, cylindricity, and linearity. The shape tolerance is used to control the shape accuracy. Various shape tolerances are divided into 12 precision levels except roundness, cylindricity and 13 precision levels. A higher level, a lower 12 levels.
3. Positioning accuracy.
It is used to indicate that the actual position accuracy of the relevant surface of the part being machined is poor. The items of positioning accuracy are: parallelism, verticality, inclination, coaxiality, symmetry, pose, circular jump, full jump, etc. The position tolerance is used to control the positioning accuracy, and the position tolerance of each item is divided into 12 accuracy levels.
The design of mechanical parts generally stipulates the machining accuracy of the parts. It should be noted that the shape error should be controlled within the position tolerance, and the position error should be smaller than the dimensional tolerance. For precision parts or important surfaces of parts, the shape accuracy requirements are higher than the positioning accuracy requirements, and the positioning accuracy requirements are higher than the dimensional accuracy requirements.
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