機械專業(yè)文獻(xiàn)翻譯--微型模具成型的熱量和擠壓控制-全文預(yù)覽
【正文】 chine (FANUC, ROBOSHOT a15) has a 機械專業(yè)中英文文獻(xiàn)翻譯 servo motor type drive with maximum clamping force of 150 kN. 3 Evaluating the injection press molding system Here are the molding conditions: Resin: Polystyrene, Resin temperature at injection: 190 oC, Mold set temperature:80 oC, Injection speed: 10 mm/s, Holding pressure:34 MPa, and Clamping force: 150 kN. Under these conditions,we pared the case with a constant voltage of 1000 V applied to push the moldcore extrusion mechanism,and the case without pushing. Figures 3 and 4 show the measurements from the sensors inside the mold. The injection force measured with a load cell placed behind the injection molding machine screw derived the injection pressure in the figure. Fig. 3. Measurements Fig. 4. Measurements of sensors (without) of sensors (with) Upper figures of Fig. 3 show the molding cycle. First at s, the injection starts and the injection pressure suddenly rises. At s, the injection pressure is held at 34 MPa for 2 s. The cavity 機械專業(yè)中英文文獻(xiàn)翻譯 pressure, measured by the 1 axis force sensor, increase with a s delay, to reach only 20 MPa, which is 59% of the injection pressure. The cavity pressure quickly went down to about zero during the injection pressure holding period. This shows that despite the pushing force at the source of the injection molding machine, friction reduces pressure which is dropped at cavity. Also, when the resin solidified in the cavity, it parted from the mold to drop the pressure to zero. The core displacement shows a transition similar to the cavity pressure indicating that it was pressed back by the resin. After further cooling to 14 s, the mold was opened. Lower figures of Fig. 3 show the surface temperature and heat flux transitions. The horizontal axes are magnified in the lower figures around the pressure holding figure shows the sequential surface temperature rise at the lock pin, gate, and cavity as resin passed over them. The heat flux maximized immediately after injection and gradually decreased. Especially at the gate, the heat flux went down to about zero during pressure holding. In Fig. 4, a voltage of 1000 V was applied to the piezo element for 2 s starting at s. The voltage raised the cavity pressure to 34 MPa. The core gradually advanced with drop in cavity pressure from the position pressed in by the resin to eventually reach 9 lm ahead of its original positio
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