摘要
针对模腔内熔体温度对制件冷却过程中其内部分子的凝聚结构及结晶形态的影响,通过自行设计制造的带有热电偶传感器和超声外场的注塑成型实验系统,采用单因素实验方法,通过测量PP制件成型过程中模腔不同位置处的熔体温度同时利用X射线衍射法,对制件内部微观结构形态的检测分析,研究了不同工艺参数和超声功率变化,对制件内部分子凝聚态结构的影响。结果表明,模腔内熔体峰值温度的升高及降温时间的延长,有利于制件内部分子形成结晶结构;但过高的熔体温度则不利于结晶结构的形成。适当增大超声功率能够有效促进制件内部分子生成结晶结构,使其结晶度提高;但过高的超声功率会使制件的结晶度下降。试验工艺参数条件下,施加600 W超声功率时,制件获得平均48.06%的最高结晶度,有效地提高了制件的力学性能。
The influence of melt cooling process on the internal molecule condensed structure and crystallization behavior of the parts was studied by the self-designed and manufactured injection molding test system, which containing thermocouple sensor and ultrasonic vibrator. The melt temperature at different positions of mould cavity was measured during the molding process of PP parts by single factor experiments, and the microstructure morphology of parts was explored by XRD. The effects of different technological parameters and ultrasonic powers on the internal molecular condensed matter structure were studied. The results show that the increase of the peak temperature and cooling time are beneficial to the formation of the molecular crystal structure, but the crystallinity will decrease under an excessive temperature, and the crystallinity increases first and then decreases with the increase of the ultrasonic power. When the ultrasonic power is 600 W, the average crystallinity of the parts is the highest, which is 48.06%. It indicates that appropriate ultrasonic field can effectively promote the production of the crystal structure during the cooling process, thus improve the mechanical properties effectively.
作者
于同敏
张拯恺
段春争
Tongmin Yu;Zhengkai Zhang;Chunzheng Duan(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第10期124-130,137,共8页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51575080,51175060)
关键词
注塑成型
熔体和模具温度
冷却凝聚
结晶结构
超声外场
X射线衍射
injection molding
melt and mold temperature
cooling condensation
crystal structure
ultrasonic field
X-ray diffraction
