Method for evaluating process characteristics of injection-molding tools

Abstract

The invention relates to a method for qualitatively and/or quantitatively classifying injection-molding tools in tool categories and determining preferred intervention ranges and/or manipulated variables for adapting injection-molding machine parameters in the case of changing ambient conditions and/or determining the influence of disturbing effects on the injection-molding process, comprising the following steps: a) providing an injection-molding machine having the injection-molding tool which is to be classified and which is intended for the determination, b) performing at least one injection-molding cycle with injection-molding machine settings in order to obtain a qualitatively adequate injection-molding part, c) determining a quotient Q=Δp/Δs or Q=Δsn/Δse characterizing the tool from c.1) a pressure rise Δp during the compression phase of the injection-molding cycle and the melt volume ΔV displaced during the compression phase or c.2) a melt volume ΔVn displaced during the holding-pressure phase and the melt volume ΔVe displaced during the injection phase, wherein c.3) the corresponding screw travel Δs, Δsn, and Δse is measured in order to determine the displaced volumes ΔV, ΔVn, and Δ; Ve, d) providing at least one limit value (G1 . . . Gx . . . Gn), wherein one or more recommendations for preferred intervention ranges or manipulated variables for adapting adjustment parameters of the injection-molding machine are associated with ranges (Q<G1; G1<Q<G2; . . . Gn-1<Q<Gn; Q>Gn) for the values of the quotient Q, e) determining in which of the ranges (Q<G1; G1<Q<G2; . . . Gn-1<Q<Gn; Q>Gn) the value of the quotient Q lies, and f) outputting the preferred intervention ranges and/or manipulated variables for adapting the machine parameters of the injection-molding machine which are associated with the determined range.