In order to make the scraper approach fast to the spinneret and press on the spinneret surface with no damage to the spinneret surface or the scraper in the process of the automatic scraping, this research was focused on the motion analysis and parameter planning of the tool setting motion. By analyzing the motion process of the automatic scraping system, the tool setting for scraper movement was described as a consistent motion with four key position nodes, and scheduled with a trapezoidal speed control curve. The contact mechanics model of scraper and spinneret was established according to Hertz contact theory. Through the qualitative analysis on scraper and spinneret damage, basis for the motion parameter design was set up so that the damage on the scraper would not occur during the motion. Consequently, the mathematical relationships of the setting speed of the scraper with force, deformation and total time in collision between the scraper and the spinneret surface, were individually obtained through the collision analysis. Taking a scraper with the radius curvature being 0.2 mm as an example, the maximum tool setting speed and the maximum collision force were calculated by MatLab under the condition that maximum damage allowed to the blade of the scraper was 0.1 mm, thus completing the motion parameter design. The results reported in this paper will also be used for the further structural design of the scraping component as a necessary design reference. Copyright No content may be reproduced or abridged without authorization.
