Dynamic adjustment method for plastic injection moulding pressure-keeping switchover

The invention discloses a dynamic adjustment method for plastic injection moulding pressure-keeping switchover. The dynamic adjustment method comprises the following steps: executing a plastic injection moulding process for at least one mould order before formally processing so as to obtain a plurality of sampling points, wherein the sampling points comprise a start point when injection pressure is converted from fluctuation to stability and a switchover point corresponding to a pressure-keeping switchover position, and simultaneously, recording corresponding injection screw position and injection pressure; calculating a product filling index FI; starting normal processing, collecting a plurality of sampling points in real time, wherein the sampling points comprise sampling points corresponding to the screw position and the start point, and then, calculating a current filling index FI*; and comparing the product filling index FI as a pressure-keeping switchover index with the current filling index, and executing dynamic adjustment of pressure-keeping switchover. By means of the dynamic adjustment method disclosed by the invention, the weight fluctuation problems of plastic products, caused by fluctuation of production factors, are obviously alleviated on the premise of not adding extra equipment; and simultaneously, the dynamic adjustment method has the advantages of being convenient to operate and control, high in precision, good in stability and the like.