0。140
250 2。186 0。263
Injection pressure (MPa) 70 5。379 0。087
80 1。091 0。051
90 1。578 0。064
100 1。622 0。159
Switchover position (mm) 6 1。261 0。022
6。12 1。091 0。051
6。24 1。367 0。293
Cooling time (s) 5 3。970 0。091
10 1。091 0。051
15 1。082 0。130
20 1。072 0。112
Packing time (s) 0。5 4。828 0。028
1 2。355 0。262
2 1。091 0。051
3 2。669 0。374
4 3。141 0。193
5 3。664 0。127
Parking pressure (MPa) 75 1。632 0。240
85 1。091 0。051
95 1。818 0。269
105 1。465 0。264
Mold temperature (°C) 70 4。874 0。369
80 1。091 0。051
90 4。084 0。754
100 4。936 0。051
Injection speed (mm/s) 70 1。368 0。132
80 1。091 0。051
90 1。161 0。012
100 1。295 0。059
obtained at the cooling stage。 In addition, as the sensor mount- ing location in the runner affects the pressure profile, the
4。4 Difference between runner and cavity pressures
The optimal parameters were used, as obtained by Taguchi experiments, and the pressure sensor top was mounted 2 mm at the lower outside diameter of the runner for experiment。 Injection’s experimental results showed the pressure history profiles of the cavity and runner, as seen in Fig。 8。 At the packing stage, the pressure profiles of the secondary runner and tertiary runner were scalariform and different from the cavity。 As the secondary runner and tertiary runner contacted the melt earlier, the pressure increased sharply。 When the melt filled the cavity, the runner pressure was similar to the cavity pressure, which increased slowly, and the pressure of the secondary runner was higher than the pressure of the tertiary runner。 At the packing stage, the pressure profiles of runners declined approximately horizontally, which is identical to the results proposed by Collins [38]。 The pressure profile at the packing stage was more explicit than that in the cavity。 However, the pressure inside the cavity was higher than that in the runner, as the pressure sensor in the runner adheres to the runner surface。 As the melt flows, the sensor in the runner cannot directly sustain the pressure of the melt, whereas, the pressure sensor in the cavity can。 Therefore, the pressure inside the cavity is higher than that in the runner。 At the cooling stage, the pres- sure profiles of the runners have a trend similar to the cavity pressure drop。 注塑模具内流道压力与型腔压力的关系英文文献和中文翻译(7):http://www.youerw.com/fanyi/lunwen_86780.html