Performance Characteristics and Clamping Force Accuracy of Internal Circulation Two-Plate Injection Molding Machine

The performance characteristics of newly full-hydraulic internal circulation two-plate injection molding machine were presented and the clamping property was especially investigated by experimental method. The external circulation was omitted and hydraulic system was simplified because of the internal circulation cylinders used in the new injection molding machine, thus significant energy saving and material saving. At the mold-moving or mold-locking stage, different cylinders were used respectively which not only balanced force and velocity but also obtained excellent mold-locking properties and high processing stability. The injection molding machine was equipped with servomotor which drived quantified pump in order to save energy and reduce noise. The testing results of clamping force showed that the actual clamping force of the 2000 kN experimental prototype reached the design value. The repeated accuracy of clamping force of two-plate injection molding machine was 0. 33‰ higher than that of conventional three-plate injection molding machine of the same size under the condition of the max clamping force,which provided important guarantee for the precise injection molding.