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The Analysis of Streaks of Impression Cylinder Gap Impact and Optimization of Impression Cylinder Based on Finite Eleent Theory
Author: FengCaiXia
Tutor: WuJiMei；GaoZhanXi
School: Xi'an University of Technology
Course: Pulp and paper and equipment
Keywords: impression cylinder gap streaks trouble impact response
CLC: TS827
Type: Master's thesis
Year: 2009
Downloads: 25
Quote: 0
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Abstract
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At the process of the high speed working in offset press, the vibration of impression cylinder gap is the main reason of streaks and poor qualities. The paper researches the dynamics and modal character of the impression cylinder of press Solna 25; optimizes the structure of the cylinder, and reduces the vibration and streaks that caused by cylinder contacts and assures the quality of the product.The main contents and achievements of the paper comprise five points:1. Based on the finite element theory and the structural finite element dynamic analysis, the paper builds up the finite element modal of impression cylinder and researches the static and dynamic analysis.2. The paper emulates and compares the response of impression cylinder gap contact under different rotational speed; gravity and moment of inertia are also considered.3. By optimizing the design of the cylinder in feasible range, the natural frequency has been increased and the attenuation process of cylinder gap contact oscillation has been accelerated.4. Compares the response of cylinder gap contact oscillation of the initial and optimized cylinder, the results indicate that the oscillating amplitude of cylinder has been reduced apparently, and also the attenuation has been accelerated too.5. Researches the producing example, measures the reason of streaks trouble of cylinder gap contact oscillation, gets rid of the old judgments by experience.Based on the practical production, the paper studies the relation between cylinder gap contact oscillation and streaks trouble of speed offset press machine, and also has optimized the structure of cylinder so that it could suits the requirement in higher speed. The research has practical meanings for the production of high speed offset press.
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CLC: > Industrial Technology > Light industry,handicrafts > Printing Industry > Lithography > Offset printing
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