摘要
梳理了注塑模具的研究现状并设计了铁路轨道高分子材料部件模具的随形冷却流道。采用选区激光熔化技术完成随形冷却流道的增材制造和无支撑流道的工艺参数优化,当下表面填充的激光速度为2 000 mm/s、激光功率为120 W,下表面轮廓的激光速度为800 mm/s、激光功率为150 W时,能够提升流道内壁的成型效果和表面质量。通过对随形冷却流道的尺寸精度检测及力学性能试验,流道位置精度可达99%,直径精度可达98%,圆度为0.089 mm,平行于基板方向的抗拉强度为1 270 MPa,垂直于基板方向抗拉强度为1 040 MPa,硬度平均值为39.2 HRC。铁路轨道部件注塑模具随形冷却流道的尺寸精度及强度满足要求,可用于模具后续研究。
The research status of injection mold was reviewed,and the conformal cooling channel of the mold for railway track polymer material part mold was designed.The selective laser melting technology was used to complete the additive manufacturing of the conformal cooling channel and the optimization of the process parameters of the unsupported channel.When the laser speed of the current surface filling is 2 000 mm/s,the laser power is 120 W,the laser speed of the lower surface profile is 800 mm/s,and the laser power is 150 W,the forming effect and surface quality of the inner wall of the channel can be improved.Through the dimensional accuracy inspection and mechanical property test of the conformal cooling channel,the position accuracy of the channel can reach 99%,the diameter accuracy can reach 98%,the roundness is 0.089 mm,the tensile strength parallel to the substrate is 1 270 MPa,the tensile strength perpendicular to the substrate is 1 040 MPa,and the average hardness is 39.2 HRC.The dimensional accuracy and strength of the conformal cooling channel of the injection mold for railway track parts can meet the requirements and can be used for the subsequent research of the mold.
作者
刘畅
周正
徐宏超
贾彤珺
隗永旺
LIU Chang;ZHOU Zheng;XU Hongchao;JIA Tong jun;WEI Yongwang(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Beijing Tieke Shougang Railway Technology Co.Ltd.,Beijing 102206,China)
出处
《铁道建筑》
北大核心
2023年第1期41-45,共5页
Railway Engineering
基金
中国铁道科学研究院集团有限公司基金(2021YJ171)。
关键词
铁路轨道
参数优化
试验研究
随形流道
轨道扣件
注塑模具
金属增材制造
选区激光熔化
railway track
parameter optimization
experimental study
conformal channel
rail fastener
injection mold
metal additive manufacturing
selective laser melting
