超声波振动与热床对熔融沉积成型的影响

Influence of hot bed and ultrasonic vibration on melt deposition molding

为了研究超声波振动与热床对熔融沉积成型技术制造出的聚对苯二甲酸乙二醇酯⁃1,4⁃环己烷二甲醇酯(PETG)试件力学性能的影响,在现有熔融沉积成型设备的基础上加入超声波振动装置,通过改变超声波功率、热床温度分别获得拉伸试件和压缩试件,并对试件力学性能进行测试。结果表明,在其他成型参数相同条件下,超声波功率在0~30 W以内时,拉伸强度随着超声波功率的增加而增大,但超声波功率过大易使试件发生翘曲变形;超声波振动能提高试件的压缩强度,当其功率为12 W时,压缩强度最大;热床温度为70℃时可获得质量较好的试件,但热床温度变化对试件力学性能的影响不显著。

To explore the effect of ultrasonic vibration and hot bed on the mechanical properties of poly(ethylene tere⁃phthalate⁃co⁃1,4⁃cyclohexanedimethanol ester)specimens manufactured through melt deposition molding,an ultrasonic vibration device was installed on the current melt deposition molding equipment to prepare the tensile specimen and com⁃pression specimen through changing the ultrasonic power and hot bed temperature.The mechanical properties of the speci⁃mens were measured.The results indicated that the specimens exhibited an increase in tensile strength with an increase in ultrasonic power in the range of 0~30 W under the same condition of other forming parameters.However,the warping deformation of the specimen was easy to occur if the ultrasonic power was too large.Ultrasonic vibration could improve the compressive strength of specimen,and the maximum compressive strength was obtained at a power of 12 W.A good quality was obtained for the specimens at a hot bed temperature of 70℃.However,there was no significant effect on the mechanical properties of the specimens resulting from the change of hot bed temperature.