目的 针对标准刮墨刀架上混用不同宽度刮墨刀所引起的工艺稳定性差异问题,研究有效悬臂长度变化对刮墨刀结构刚度和磨损行为的影响,并提出刮墨刀选型与安装建议。方法 以联机凹印设备通用的标准刀架为对象,建立40 mm和45 mm 2种刮墨刀的三维有限元模型,在0.02~0.06 MPa接触压力下进行静力学分析,并结合生产现场磨损数据进行验证。结果 仿真结果表明在标准刀架安装约束下,45 mm刮墨刀有效悬臂增加5 mm,在0.06 MPa的极限压力下,其最大变形量为40 mm刀型的1.6倍。在相同压力条件下,40 mm刀型表现出更低的变形敏感性和更稳定的磨损响应。现场实测数据表明,45 mm刮墨刀的磨损分布更分散,且容易产生波浪形异常磨损。结论 在标准刀架体系下,影响刮墨刀工艺稳定性的关键因素是有效悬臂长度。在本文工况范围内,40 mm刀型因悬臂较短而表现出更高的结构刚度和更稳定的工艺响应;对于中高负载工况,应优先采用短悬臂安装方案,或通过调整支撑方式控制有效悬臂长度。
Abstract
Mixing doctor blades of different widths on standard blade holders often leads to variations in process stability in inline gravure printing. The work aims to investigate the influence of effective cantilever length on the structural stiffness and wear behavior of doctor blades, and provide guidance for blade selection and installation. Taking a standard blade holder commonly used in inline gravure presses as the research object, three-dimensional finite element models of 40 mm and 45 mm doctor blades were established. Static analyses were carried out under contact pressures ranging from 0.2 to 0.6 MPa, and the numerical results were further verified using wear data collected from actual production. The simulations showed that, under the installation constraints of a standard blade holder, the effective cantilever length of the 45 mm doctor blade increased by approximately 5 mm. At the ultimate pressure of 0.6 MPa, the maximum deformation of the 45 mm doctor blade reached about 1.6 times that of the 40 mm doctor blade. Under the same pressure conditions, the 40 mm doctor blade exhibited lower deformation sensitivity and more stable wear response. Field observations also revealed that the wear distribution of the 45 mm doctor blade was more dispersed and was more prone to wave-shaped abnormal wear. These results suggest that the effective cantilever length is a key factor affecting the process stability of doctor blades in standard blade holder systems. Within the operating conditions considered in this study, the shorter cantilever of the 40 mm doctor blade provides higher structural stiffness and more stable process performance. For medium-to-high load conditions, a shorter cantilever installation scheme is therefore recommended, or the effective cantilever length should be controlled through adjustment of the supporting structure.
关键词
联机凹印设备 /
刮墨刀 /
有限元分析 /
工艺稳定性
Key words
inline gravure press /
doctor blade /
finite element analysis /
process stability
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