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兵工学报 ›› 2018, Vol. 39 ›› Issue (9): 1811-1819.doi: 10.3969/j.issn.1000-1093.2018.09.019

• 论文 • 上一篇    下一篇

气压砂轮双层结构弹性力学分析及加工特性

曾晰, 潘烨, 张利, 计时鸣, 陈国达, 杭伟   

  1. (浙江工业大学 特种装备制造与先进加工技术教育部重点实验室, 浙江 杭州 310014)
  • 收稿日期:2017-12-08 修回日期:2017-12-08 上线日期:2018-10-25
  • 通讯作者: 张利(1971—),女,副教授,硕士生导师 E-mail:zhangli@zjut.edu.cn
  • 作者简介:曾晰(1984—),男,副教授,硕士生导师。E-mail:franckie@126.com
  • 基金资助:
    国家自然科学基金项目(51875526); 浙江省自然科学基金项目(LY18E050023、LQ16E050012)

Analysis of Double-layer Eastic Mechanics and Machining Characteristics of Pneumatic Grinding Wheel

ZENG Xi, PAN Ye, ZHANG Li, JI Shi-ming, CHEN Guo-da, HANG Wei   

  1. (Key Laboratory of Special Purpose Equipment and Advanced Processing Technology of Ministry of Education, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China)
  • Received:2017-12-08 Revised:2017-12-08 Online:2018-10-25

摘要: 为了提升激光强化后高硬度模具自由曲面的光整效果,提出基于软固结磨粒和双层结构弹性体的气压砂轮加工方法。对气压砂轮双层结构弹性力学特性进行分析。在圆形均布载荷环境下,分别引入磨粒层弹性模量与橡胶层弹性模量的比值m及橡胶层厚度与载荷半径的比值n,建立了双层结构弹性体加工应力计算模型以及接触形变公式。通过有限元分析软件ANSYS建立了气压砂轮双层结构弹性力学模型,给出了气压砂轮的应力分布规律以及形变特征。在试验分析中,通过短纤维增补的方法增强内橡胶层,通过耐水黏结剂控制外磨粒层,微观分析证实了双层结构弹性力学的分析假设。搭建气压砂轮加工试验平台,验证了气压砂轮可在短时间内提升高硬度激光强化模具表面质量的加工效果。试验结果表明,面向凹面工件时,较低n值的气压砂轮有助于提升表面质量;面向凸面工件时,在获得相同表面质量的情况下,较高n值的气压砂轮有助于提升加工效率。

关键词: 气压砂轮, 力学特性, 软固结磨粒, 模具, 自由曲面

Abstract: The double-layer elastic mechanics theory of pneumatic grinding wheel with softness consolidation abrasives (SCA) is analyzed for improving the finishing of freeform surface of laser hardened mould with high hardness. Under the circular uniformly distributed stress, the ratio factor m of elasticity modulus of abrasives layer to that of rubber layer and the ratio n of abrasives layer thickness to radius of stress are introduced to establish a machining force model and deformation formula of double-layer elastic wheel. And then a double-layers elastic model of wheel is established by using ANSYS, and the machining process is simulated. Stress distribution and deformation rule are given through simulation. In the experiment, the fiber is used to reinforce the inner rubber layer, and the binder is used to hold the abrasive particles. Microcosmic analysis demonstrates the analytical hypothesis of double-layer elastic mechanics. A machining platform is set up. The experimental results show that the freeform surface of laser hardened mould can be efficiently finished by using the pneumatic grinding wheel. The pneumatic grinding wheel with lower factor n can help to decrease Ra for concave surface, and the pneumatic grinding wheel with higher factor n can improve the machining efficiency of convex surface.Key

Key words: pneumaticgrindingwheel, mechanicalproperty, softnessconsolidationabrasive, mould, freeformsurface

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