The invention provides an injection speed determination method and device, an injection molding method and device and
electronic equipment, and belongs to the field of intelligent manufacturing, and the method comprises the steps that an
injection molding machine is controlled to conduct injection according to multiple different set injection speeds, the actual filling time and the actual
injection pressure peak value at each set injection speed are obtained, and a
relative viscosity index is obtained through calculation; and determining the change trend characteristics of the
relative viscosity index along with the set injection speed based on the
relative viscosity index, and determining the target injection speed of the
injection molding machine. The physical principle that the
injection pressure and the filling time represent the
viscosity under the constant volume is utilized, a
rheology curve can be constructed without an external
rheometer, the optimal process point is automatically locked by identifying the stable trend of the curve, the problems that traditional injection molding depends on empirical
machine adjustment, and the flowability cannot be objectively quantified are solved, and the production efficiency is improved. And accurate and automatic setting of scientific
mold testing and process parameters is realized.