精密不锈钢管金刚石涂层模具制备与应用

不锈钢管拉拔生产时易产生缩径,采用硬质合金模具拉拔时,模具耐磨性不高,难以保证产品尺寸精度。设计出一种改进型拉拔模具,借助有限元法对不锈钢管空拉过程进行模拟。利用正交试验法研究不同拉拔模具的次压缩区高度L、主压缩区半角α1和次压缩区半角α2对拉拔过程的影响,得到优化的几何参数L=2 mm,α1=14°,α2=4°。通过偏压辅助增强热丝化学气相沉积法,以WC-Co硬质合金拉拔模具为衬底,采用穿孔直拉热丝方式,以优化的预处理方法和沉积工艺,在模具表面沉积均匀的金刚石涂层。采用扫描电镜和Raman光谱对金刚石涂层表面特征进行研究,结果表明金刚石涂层表面平整,光洁度高,涂层厚度均匀。

Production and application of precision stainless steel pipe diamond coating die

Drawing down occurred when stainless steel tube was drawn production. When carbide die was used to draw, the wear resistance of die is low, which cannot guarantee production size precision. A kind of improved type drawing die was designed, stainless steel pipe hollow drawn process was simulated by using FEM. The influence of secondary compres- sion area height L, The main compression area half angle α and secondary compression area half angle α2 of different draw- ing die on drawing process was researched by adopting orthogonal test, and optimized size parameters are L = 2 mm, α = 14° ,cq =4°. Diamond coating surface were deposited on the WC -Co drawing die by using electronically aided hot fila- ment chemical vapor deposition and adopting perforation hot wire drawn with optimized pretreatment way and deposition process. Results show that diamond coating surface is smooth, high finish, coating thickness even.