此外还介绍了成型收缩率的评价方法。
成型收缩率小，尺寸稳定性好，熔体粘度小，易成型加工。
Molding shrinkage of small, good stability, melt viscosity size is small, easy forming process.
本工作采用试验与数值模拟相结合的研究方法，对玻璃纤维增强聚丙烯系列材料的成型收缩率进行了深入研究。
Therefore, the shrinkage of the glass fiber reinforced polypropylene specimens prepared by injection was investigated with the combination of the experiments and the simulation.
塑料的成型收缩率直接关系到制品的形状和尺寸精度，因此在塑料注射成型的模具设计中，迫切需要预测制品的成型收缩率。
The shrinkage of plastic products is a very important parameter and need to be forecast during the design of injection molds, which affects the shape and size precision of the products.
结果表明，制品厚度对其成型收缩的影响很大，制品厚度增大时，注射成型收缩率增大，但这种增大的趋势是非线性的，而是随着厚度的增加而逐渐减缓。
The results show that the shrinkage of injection molding part is increased with thickness of parts in non-linearity, and the increase momentum is moderated with the increase of thickness.
采用一般的平均收缩率方法来确定模具型腔的成型尺寸，已难以满足精密注塑成型制品的精度要求。
Using average shrinkage rates of injection-molded parts to decide the dimension of mold cavity can not satisfy the demand of high precision injection-molded parts.
在这些应用场合，不仅要求塑料制品的精度高，而且塑料制品形状也比较复杂，这使得对注塑成型制品收缩率的控制变得十分重要。
Industrial plastic parts are usually requested to have high precision and complicated shapes, so it is important to control the shrinkage rates of injection-molded parts.
采用BP神经网络建立注塑成型工艺参数与注塑制品收缩率之间的网络模型，并通过试验数据对成型工艺参数进行优化。
BP Neural Network is applied in this paper to establish the model between the process parameters and the shrinkage, and to optimize the process parameters by the test data.
并就简化模具结构设计的优缺点与前后三次激光选区烧结（SLS）的成型工艺条件和收缩率进行了探讨，提出了SLS技术的现状、发展趋势与方向。
The advantages and disadvantages of simplifying the mould structure, and the molding condition and contraction rate of the successive SLS three times are discussed.
成型坯体的干燥收缩率小于0.3%，密度分布的标准偏差为0.32%，反应烧结过程中，坯体的收缩率小于0.2%。
Theshrinkage of green body was 0.3% and the density deviation was 0.32%. After infiltrated with molten silicon, the shrinkage of sintering body had another 0.2%.
本文分析了精密注塑成型过程中温度与制品收缩率的复杂关系，特别是在聚合物不同的情况下温度对精密注塑成型制品收缩率的综合影响。
The complex connections between temperature and shrinkage are described in this work, and how these connections are affected by the characteristics of plastics is discussed too.
本文分析了精密注塑成型过程中温度与制品收缩率的复杂关系，特别是在聚合物不同的情况下温度对精密注塑成型制品收缩率的综合影响。
The complex connections between temperature and shrinkage are described in this work, and how these connections are affected by the characteristics of plastics is discussed too.
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