Several main aspects affecting the machining accuracy of CNC prototype model

five main aspects affecting the machining accuracy of CNC prototype models

1, dimensional accuracy

refers to the degree to which the actual size of the machined part is consistent with the tolerance band center of the part size. The dimensional accuracy is controlled by the dimensional tolerance. Dimensional tolerance is the amount of variation allowed by the size of the part in cutting processing. In the case of the same basic size, the smaller the dimensional tolerance and the smaller, the higher the dimensional accuracy.

2, Shape Accuracy

refers to the degree to which the actual geometry of the surface of the machined part conforms to the ideal geometry. The items for evaluating the Shape Accuracy include 6 items such as straightness, flatness, roundness, cylindrical degree and line profile. The shape accuracy is controlled by the shape tolerance. The shape tolerances are divided into 13 accuracy grades except for the round and cylindrical degrees, and the rest are divided into 12 accuracy grades.

3, position accuracy

refers to the difference in actual position accuracy between the relevant surfaces of the part after processing. The items to assess the accuracy of the position include eight items: parallelism, verticality, inclination, coaxiality, symmetry, position, circle beating and full beating. The position accuracy is controlled by the position tolerance, and the position tolerance of each project is also divided into 12 accuracy grades. 4. Tool: the knife used in the processing machine is generally a tungsten steel knife. After using this knife several times, the knife will wear out, so there is also an error in the knife.

5. Manual knife facing: if there is a knife facing instrument, there will be no problem with the knife facing. However, in order to save costs in many small prototype factories, when selecting machines, they will choose not to have a knife-facing instrument and can only manually pair knives, so there are tolerances on personnel. In order to ensure the accuracy of the prototype, the extension model has been installed on many cnc equipment, which can not only accurately correct the knife, but also greatly improve the work efficiency.

All in all, the tolerance of the prototype factory is 0 in terms of machine itself, tool wear, and manual knife alignment. About 1mm. If the parts need multi-faceted processing, the risk will be multiplied and the tolerance will be multiplied.

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