外文翻譯--塑料注射模具設(shè)計(jì)及其熱分析-模具設(shè)計(jì)(編輯修改稿)
2025-06-26 07:18 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 le, flashing was reduced by reducing the packing pressure of the machine. Warpage can be controlled by controlling various parameters such as the injection time, injection temperature and melting temperature. After these modifications, the mould produced high quality warpage testing specimen with low cost and required little finishing by degating. Fig. 4 shows modifications of the mould, which is machining of extra air vents that can eliminate short shot. Fig. 4. Extra air vents to avoid short shot. . Detail analysis of mould and product After the mould and products were developed, the analysis of mould and the product was carried out. In the plastic injection moulding process, molten ABS at 210 ?C is injected into the mould through the sprue bushing on the cavity plate and directed into the product cavity. After cooling takes place, the product is formed. One cycle of the product takes about 35 s including 20 s of cooling time. The material used for producing warpage testing specimen was ABS and the injection temperature, time and pressure were 210 ?C, 3 s and 60MPa respectively. The material selected for the mould was AISI 1050 carbon steel. Properties of these materials were important in determining temperature distribution in the mould carried out using finite element analysis. Table 2 shows the properties for ABS and AISI 1050 carbon steel. Table 2 Material properties for mould and product The critical part of analysis for mould is on the cavity and core plate because these are the place where the product is formed. Therefore, thermal analysis to study the temperature distribution and temperature at through different times are performed using mercial finite element analysis software called LUSAS Analyst, Version . A twodimensional (2D) thermal analysis is carried out for to study the effect of thermal residual stress on the mould at different regions. Due to symmetry, the thermal analysis was performed by modeling only the top half of the vertical cross section or side view of both the cavity and core plate that were clamped together during injection. Fig. 5 shows the model of thermal analysis analyzed with irregular meshing. Modeling for the model also involves assigning properties and process or cycle time to the model. This allowed the finite element solver to analyze the mould modeled and plot time response graphs to show temperature variation over a certain duration and at different regions. For the product analysis, a two dimensional tensile stress analysis was carried using LUSAS Analyst, Version . Basically the product was loaded in tension on one end while the other end is clamped. Load increments were applied until the model reaches plasticity. Fig. 6 shows loaded model of the analysis. Fig. 5. Model for thermal analysis. Fig. 6. Loaded model for analysis of product. . Result and discussion for mould and product analysis For mould analysis, the thermal distribution at different time intervals was observed. Fig. 7 shows the 2D analysis contour plots of thermal or heat distribution at different time intervals in one plete cycle of plastic injection molding. Fig. 7. Con
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