mulberry outlet 2006 【5] Ma Wenqi

Moldflow's panel on Optimization of injection mold gate

In the internal parts or the formation of the cavity surface cavitation. Cavitation causes the following: (1) The presence of volatile gases, in the production of plastic parts inside the bubble; (2) plastic flow is poor, some places are not filled quickly, resulting in a bubble; ( 3) The plastic surface cooling faster than the center, formed in the plastic parts inside a vacuum bubble. These air bubbles to form a cavitation on the plastic parts of the strength and appearance quality have a greater impact. Figure 6 shows, the plastic parts of the structure is complicated, the program in 1,2,3, are generated a lot of air hole, but found after comparing the three options, Option 1 in the relatively high cavitation, while Scenario 2 and Option 3 in the cavitation is similar to a relatively small,[link widoczny dla zalogowanych], by comparison, should be preferred Option 2 or Option 3. (A) Option 1 plastic air cavity (b) Scenario 2 plastic cavitation (C) Option 3 plastic cavitation under different scenarios in Figure 6 Plastic Weld cavitation number and distribution of 3.3 in the plastic melt filling the cavity, two or more melt front 2009: ~ E 8 (Total 100) MOULD & DIEPROJECT die 1 = 81} meet integration process,[link widoczny dla zalogowanych], the formation of weld lines, under normal circumstances, the melt front angle of less than 135. , The formation of weld line. If the weld lines meet, the temperature is lower than the molding temperature 2O degrees, the poor quality of the weld line. Weld is an inevitable phenomenon forming process, in order to improve the structural strength, improve the appearance quality of plastic parts, should be possible to reduce the number of weld lines, some special circumstances, can change the location of weld lines to improve the quality of plastic parts in Figure 7 formed under a different gate location of weld lines. As the plastic parts must have a certain strength and stiffness, the number of weld lines and distribution is particularly important, should be compared to Weld in a good position to reduce its impact on the quality of the panel. By analyzing three programs in Figure 7, different weld line, program 1 and Option 3 in the relatively large number of weld lines, so the priority should be given options 2. * ~ DW tEJ - tI-l, (a) Option 1 Plastic Weld (b) side dishes Plastic Weld 2 (c) Option 3 Plastic Weld under different scenarios in Figure 7 Plastic Weld 3. 4 clamping force curve in the process of plastic injection molding machines, due to expansion force of melt within the mold, the mold parting surface may be separated,[link widoczny dla zalogowanych], resulting in the production of flash, it is necessary for the injection mold machine to provide a locking force, this force known as the clamping force, with this power can offset the melt in the cavity expansion force produced by melting. Usually meet the requirements of the premise, the clamping force should be as small as possible, the smaller clamping force can not only save energy, reduce costs, it can prolong the life of injection molding machines and molds, while the mold is also the natural exhaust can proceed smoothly, so that the filling state of the mold more easily controlled. Figure 8 under different gate injection molding machine clamping force required, the three curves by analyzing the graph, find the minimum clamping force required for Option 1, about 34 tons, ~ 9 @ 27MPa; Option 2 of the clamping force followed; Option 3 the maximum clamping force,[link widoczny dla zalogowanych], clamping force based on analysis, priority should be given options 1.4 Conclusion injection mold casting system right choice or not, directly determines the performance of plastic parts, quality and production efficiency, according to the specific conditions, using 82 Die Engineering MOULD & DISPROJEC ~ 2oo9 ~ No. 8 overall No. 100 f j ~ llsIh program 1 when clamping force curve 2: Scenario 2 clamping force curve 3: Option 3 laps 8 lock clamping force touch force curve curve moldflow filling time of the panel, weld lines,[link widoczny dla zalogowanych], air traps and clamping force curve can be deduced that the three gating system in the above scenario, the overall effect of Option 2 is better, in the design of the mold, you can set the gate as shown in Scenario 2, through mold flow analysis, mold design more reasonable, with good results, but also reduce the mold design cycle, reducing costs and reduce the risk of design errors. State References: [1] Cao deep. Zhao Zhong governance plastic molding process and mold design, Beijing: China Machine Press. 1993 [2] Ming Zhong day. Pro/ENGINEERWildfire3.0 injection molding products. Beijing: Tsinghua University Press, 2007f3】 Zhou Yan. Moldflow5.0 base and a typical example. Beijing: Electronic Industry Press, 2007. [4] Qu Huachang. Plastic molding process and mold design. Beijing: Higher Education Press, 2006 【5] Ma Wenqi, SUN ytterbium plastic molding simulation software technology base and applications. Beijing National Railway Publishing House, frown :923021 -549 593 ~:. Beng uLumuu ... welcome contributions in the

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