機(jī)械專業(yè)文獻(xiàn)翻譯--微型模具成型的熱量和擠壓控制(文件)
【正文】 element used (KISTLER,Z17294X2) has a maximum free displacement of 13 lm and produces a maximum force of 6 kN with no displacement,thus the pressing force varies between 0 and 6 kN depending on the piezo element extension. The piezo element has a single axis force sensor (KISTLER, 9134A) integrated in it for pressing force feedback control. The piezo element unit size is 25 mm in diameter, 54 mm long and its temperature Fig. 1. Test mold range is )20 to 120oC. The symmetric design of the force transferring structure uniformly transfers the pressing force from the piezo element. This cylindrical force transfer mechanism moves in one direction and a planar surface keeps the shaft from rotating.A small sensor assembly was developed for our study in this paper. Displacement, pressure, and heat flux sensors pose the assembly. The displacement sensor measures the displacement at the moldcore extrusion mechanism where it presses the moldcore, and the displacement in the parting direction at the parting line.The displacement sensor is an eddycurrent type noncontact displacement sensor (SINKAWA Electric, VC202N) with range of 500 lm and resolution of lm. The above 1 axis force sensor served as the pressure sensor to measure the cavity internal pressure.The heat flux sensor measured the cavity surface temperature and the heat flux. A pair of thermocouples embedded at depths and mm enabled these measurements with the principle of inverse heat mounted the diameter mm heat flux sensors on the gate, cavity and sprue lock pin (Fig. 2).We placed one moldcore at the mold center. The microstructure was triangular grooves arranged with pitch 1 lm. The core surface had 32,768 triangular grooves with 140_ angle that are mm long on the perimeter of a mm circle.Fig. 2. Cavity details and moldcore The finished product formed intoa 1 mm thick disk with diameter 12 mm. The core was made of steel (UDDEHOLM, STAVAX, 52 Rockwell hardness), with NiP plating. We cut the triangular grooves with an ultra precision NC machine (FANUC ROBOnano Ui).Two 12 lm deep air vent grooves were placed on the perimeter of the cavities. A vacuum pump pumped out residual air and gas from molten resin. To provide rigidity similar to a regular mold, we kept the entire 80 kgf mold size the same. For
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