How to improve the precision management of moulds during the processing of injection moulds. First of all, we need to know what aspects of the problem is to affect the accuracy of injection mould production.
1、Dimensional accuracy
Refers to the actual working size of the processed parts and the tolerance size and range of the parts.
Dimensional accuracy is controlled by the size tolerance. Size tolerance is the size of the part in the cutting process allows the amount of change. In the case of the same basic size, the smaller the dimensional tolerance, the higher the dimensional accuracy.
2, shape accuracy
Refers to the machined product parts to carry out the surface of the actual problem geometric structure shape and the ideal is the geometric model shape of the degree of coincidence. There are 6 items to assess the shape and accuracy, such as straightness, flatness, roundness, cylindricity and line contour. Shapes with different accuracies are controlled by shape tolerance management. In addition to roundness and cylindricity, all of these shape tolerances are divided into 12 accuracy requirements level. 1 high, 12 low.
3、Positional accuracy
It refers to the difference between the research surface between the machined parts and the actual working position and accuracy of the enterprise. Accuracy evaluation of position information includes eight aspects: parallelism, perpendicularity, inclination, coaxiality, symmetry, position, circumferential runout and full runout. Positional positioning accuracy is controlled by positional tolerances, which are divided into 12 accuracy assessment levels for various purposes.
Usually when carrying out the design of mechanical parts and machining accuracy, attention should be paid to the internal control system position tolerance in the shape of the error, the position error should be less than the size tolerance.
