mold_flow_checklist_解释说明.ppt

1、Enter fill/pack switchover percentage for each scenario 填充/保压转换时填充百分率,This plot shows the pressure distribution at 97% switchover by volume. Pressure to fill 8,675 psi.,97%,JES3.2Analyze Mold Flow and Select Optimal Scenario通过模流分析选择最佳方案,Enter maximum pressure at end of fill for each scenario 第一阶段注射压

2、力,This plot shows the pressure distribution at 97% switchover by volume. Pressure to fill 8,675 psi.,8675.6,Review pressure distribution and balance at end of fill for each scenario 压力分布及填充平衡,Avoid,Good,Part is poorly balanced and has large distribution of pressure 产品填充不平衡且压力差较大,Part is very well ba

3、lanced and has small distribution of pressure 产品填充平衡且压力分布均匀,Consequences: Uneven pressure distribution can result in less consistent material shrink, higher residual stresses, and areas of overpack or underpack conditions. 压力分布不均会导致材料收缩不一致，残余应力高并且有些地方可能出现断层情况。,Enter flow front temperature variation

4、at end of fill for each scenario 前端温差,551.5 - 548.9 = 2.6,Enter bulk shear rate in gate for each scenario 浇口处剪切率,60,000,流体的流动速相对圆流道半径的变化速率剪切速率(shear rate),Enter shear stress in the part for each scenario 填充末端（95%时）壁上剪切力,25,Review weld lines and include temperature at flow front for each scenario 熔界线

5、位置和长度包括熔接线位置的前端温度,GUIDELINES: Minimize the length of all knit lines. Where possible, horizontal lines are preferred to vertical knit lines. Also, review the flow front temperature at the weld lines.使熔接线长度最小化。 可能的话，水平的熔接线比垂直的好。同时要审核熔接线处的前端温度。,CONSEQUENCES: Lower temperatures may indicate that it will

6、 be difficult to control the appearance of the weld line. The strength of the cooler weld lines may also be less than higher temperature weld lines.温度低会使得熔接线外观难于控制。温度低的熔接线处强度比温度高的差。,Review air traps for each scenario 气泡,Avoid,Vent,GUIDELINES: Force all air traps to edges of part. Air traps located a

7、t the edges of the part should be vented. Air traps that are on the surface of the part should be avoided. 将所有气泡赶到产品边缘。位于产品边缘的气泡可以排气。避免产品表面气泡。,CONSEQUENCES: Air traps that are not properly vented can cause gas burns in those locations. 不能排气的气泡可能导致该区域气体灼伤。,Enter pack and hold pressure for each scenar

8、io 第二阶段压力,6,400 (80% of 8,000),6,400,8,000,Review injection pressure at nozzle versus time for each scenario 喷嘴处压力/时间图,GUIDELINES: Optimal designs have nearly equal spikes at filling and switchover points. 最好是尖点位于转换点。,CONSEQUENCES: Uneven spikes are an indication of unbalanced parts, which can lead

9、to residual stresses.若不然会导致产品不平衡，产生残余应力。,Enter pack and hold time for each scenario 第二阶段（保压）时间,20 5 = 15,Gate Freeze at 20 sec.,20,5,Enter maximum clamp tonnage required for each scenario 最大锁模力,1600,Review and enter volumetric shrinkage at ejection for each scenario 顶出时的体积收缩量,4.06,Enter sink mark de

10、pth value for each scenario 最大缩印深度值,0.12,Enter cavity and core coolant flow rate required for turbulence for each scenario 型腔及型芯冷却水流动速率，保证是湍流水,111,Enter cavity and core mold wall temperature range for each scenario 型腔壁上温差（模温）,150 100 = 50,Avoid,Enter cavity and core mold wall temperature range for e

11、ach scenario 型腔型芯最大模温差,40,Avoid,Positive values indicate that the cavity is hotter than the core,Cavity/core temperature difference 型强/型芯温度差异,Enter temperature rise in coolant for cavity and core for each scenario 型腔及型芯进出水温差,80.82 80 = 0.82,Enter circuit Reynolds number for cavity and core for each scenario 型腔及型芯最小雷诺数,28,167,Enter X