Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (09): 143-148.doi: 10.13475/j.fzxb.20191205906

• Machinery & Accessories • Previous Articles     Next Articles

Motion analysis and parameter design of tool setting process in automatic scraping

DING Caihong(), LI Shucheng, WU Xiru   

  1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
  • Received:2019-12-26 Revised:2020-04-13 Online:2020-09-15 Published:2020-09-25

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Abstract:

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.

Key words: spinneret, automatic scraping, tool setting motion, speed control curve, collision analysis, Hertz contact theory

CLC Number: 

  • TS112.7

Fig.1

Automatic scraper robot system"

Fig.2

Scraper component"

Fig.3

Structural relationship between scraper and holder"

Fig.4

Schematic diagram of position during tool setting movement"

Fig.5

Speed control curve of tool setting motion"

Fig.6

Elastic (a) and plastic (b) deformation of microconvex bodies"

Tab.1

Basic parameters of scraper and spinneret"

名称 材料 弹性模量/GPa 泊松比 硬度/(N·mm-2) 粗糙度/μm 质量/kg
铲刀 H62 Y2 90 0.32 1 029 — 0.015
喷丝板 SUS 630 210 0.28 3 430 0.2 1.444

Fig.7

Contact form between scraper and spinneret surface"

Fig.8

Curve of Hertz contact force lag"

Fig.9

Analysis on relationship of parameters in collision between scraper and spinneret. (a) Maximum press-in deformation and collision speed; (b) Maximum collision force and collision speed;(c) Collision time and collision speed"

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