激光清洗轮胎模具表面橡胶层的机理与工艺研究

研究了运用脉冲激光清洗橡胶轮胎印字模具表面橡胶层的工艺参数与机理.结果表明,工艺参数适当时,脉冲激光能完全清洗模具表面而不损伤基体.激光清洗存在着清洗阈值和损伤阈值.在起始清洗阈值和完全清洗阈值之间,清洁率随着激光能量密度的升高而增大.在完全清洗阈值与损伤阈值之间,基体表面清洁率保持100%而且不受任何损伤.激光清洗橡胶的机理有二:一为激光产生的高温导致橡胶表层瞬间燃烧和气化;二为橡胶深层受热振动和激光脉冲的热冲击作用使铝片表面橡胶颗粒飞溅.

Parameters and Mechanisms of Laser Cleaning Rubber Layer on a Tyre Mould

This report presented a detailed study on parameters and mechanisms of cleaning rubber layer from a tyre wording mould with pulse laser. The results demonstrated that pulse laser can remove rubber layer completely under proper parameters. There exist cleaning threshold and damage threshold in laser cleaning. Between the initial cleaning threshold and complete cleaning threshold, cleaning percentage of the surface increases with the increasing of laser fluence. When the laser fluences are between complete cleaning threshold and damage threshold, cleaning percentage keeps up 100% and no damage is found on substrate surface. Two mechanisms for laser cleaning rubber layer are suggested: one is the combustion and vaporation of upper rubber layer resulted by high temperature of laser beam, the other is the vibration of deep rubber layer as well as thermal shock action by laser pulse to make rubber particles sputter.