Study On The Mechanism Of Cleaning Rubber Products Mold By Laser

With the development of economy, a large number of rubber products have appeared on the market,but these molds which are used to manufacture the rubber products are liable to be polluted. In order to maintain the accuracy of molds, it is necessary to remove the dirt on the surface. Traditional cleaning methods can not meet the needs of production, so laser technology is applied to clean the molds. Laser cleaning is a new type of industrial cleaning technology,and has many advantages,such as environmental protection, high washing efficiency and low labour intensity. Therefore, laser cleaning has been demonstrated as a new type of cleaning technology which has high practical value and developmental potential.The causes of polluting molds surface were analysed in this paper. The main adhesion force between the rubber particles of the molds surface and the substrate is van der waals force. The rubber particles adsorbed on the surface of the molds were removed by casting. The mechanism of dry laser cleaning was analysed in this paper. A heat conduction model of laser cleaning rubber products molds was established, and the heat conduction equation was solved by the finite difference method.The software of ANSYS was used to simulate the temperature distribution of the mold surface when laser heat cleaned the rubber products mold, and calculate the maximum temperature of the mold surface in the different laser power densities. The linear equation between the laser power density and the maximum temperature of the mold surface was gained by the obtained data. The theoretical value of damage threshold of laser cleaning mold was forecasted by the linear equation, and its value is 1611W/cm~2. The adsorption force between the rubber particles and the mold surface and the cleaning force by laser irradiation were calculated, then the theoretical value of the cleaning threshold of laser cleaning 5μm rubber particles was gained, and its value is about 500 W/cm~2. The value of leaning threshold of 1μm rubber particles is about 610 W/cm~2.Experiments were done to study the laser cleaning mold technology. The laser power, defocus and scanning speed to the impact of the cleaning effect was gained. Laser cleaning threshold and damage threshold were acquired by experiments. The value of the damage threshold is 1590W/cm~2, which is very close to the theoretical value. The value of the cleaning threshold is 530.2 W/cm~2, which shows that the particle radius is mainly between 1μm and 5μm. The laser cleaning molds technology was put into the practical application after the laser cleaning threshold and damage threshold were validated. The advantages of the laser cleaning molds can be easily gained by using laser cleaning technology to clean seals mold. Laser cleaning will be the mainstream of molds cleaning in the future,and play an important role in the molds industry.