CFRP钻削加工排屑仿真及实验研究
发布时间：2018-10-17 09:24
【摘要】：现阶段碳纤维复合材料钻削加工产生切屑的排出方式,仍然以人工手持吸尘器排屑为主,这种排屑方式效率低,降低CFRP制孔质量且污染环境,吸气式内排屑钻削刀具作为吸气式自排屑系统的重要组成部分,它能够有效地解决CFRP切屑无法及时排出的问题,已成为现阶段国内外CFRP钻削加工排屑技术研究的重点,而如何在保证其排屑性能的前提下选择合理钻削加工参数与排屑负压具有重要的实际应用价值与切实的现实意义。首先,阐述吸气式内排屑系统结构组成与工作原理,对CFRP钻削过程中影响排屑效率的各因素加以分析,以自主研制的CFRP钻削专用聚晶金刚石内排屑刀具为研究对象,建立排屑仿真的流动控制方程,内排屑刀具流道内湍流模型,近壁区模型。其次,在研究CFRP切屑性质的基础上,计算切屑颗粒在排屑流道内的排屑气流速度,基于流体仿真软件Fluent、三维建模软件建立内排屑刀具三维流道模型,使用Gambit划分网格,对内排屑钻削刀具进行流体力学仿真。仿真过程中使用压力耦合算法SIMPLEC求解计算方程,实现刀具内气流场的数值模拟,获得压力、速度与湍动能分布情况,进而对内排屑刀具的排屑特性进行分析研究。再次,内排屑钻削刀具的转速与出口负压的变化会对内排屑刀具排屑的效果产生影响,进而发生堵屑或切屑无法排出的现象,根据CFRP切屑颗粒排屑过程的瞬时受力分析,应用流体仿真软件Fluent建立排屑估算模型,得到了自主研制的CFRP钻削专用聚晶金刚石内排屑刀具出口负压值、刀具转速与排屑性能之间的关系,预测了该刀具的排屑性能。最后,通过真空发生器完成吸气泵的改造,进而完成钻削机床的改造,搭建CFRP吸气式内排屑钻削试验系统,在设计工况下,通过对比实验对比不同工况下CFRP实际钻削过程产生切屑排出的时间与切屑排出效果,对所研制的内排屑刀具排屑性能进行评价,检验仿真结果的准确性。
[Abstract]:At the present stage, the main way to discharge chips produced by drilling of carbon fiber composite materials is the hand-held vacuum cleaner, which is inefficient, reduces the quality of CFRP hole making and pollutes the environment. As an important part of the air-suction self-draining system, the air-suction internal chip drilling tool can effectively solve the problem that CFRP chip can not be discharged in time. It has become the focus of the research on the chip removal technology of CFRP drilling at home and abroad at present. How to select reasonable drilling parameters and chip negative pressure under the premise of ensuring its chip removal performance has important practical value and practical significance. First of all, the structure and working principle of the suction internal chip removal system are described. The factors that affect the chip removal efficiency during CFRP drilling are analyzed. The special polycrystalline diamond chip removal tool developed by ourselves for CFRP drilling is taken as the research object. The flow control equation of chip removal simulation was established, the turbulence model in the flow channel of internal chip discharging tool and the near wall model were established. Secondly, on the basis of studying the properties of CFRP chip, the velocity of chip draining gas flow in the chip discharge channel is calculated. Based on the 3D modeling software of Fluent, the three-dimensional flow channel model of the chip discharging tool is established, and the mesh is divided by Gambit. The hydrodynamic simulation of internal chip drilling tool is carried out. In the process of simulation, the pressure coupling algorithm SIMPLEC is used to solve the calculation equation, and the numerical simulation of the air flow field in the tool is realized. The distribution of pressure, velocity and turbulent kinetic energy is obtained, and the chip removal characteristics of the cutting tool are analyzed and studied. Thirdly, the change of rotary speed and outlet negative pressure of internal chip drilling tool will affect the chip removal effect of internal chip removal tool, and then the phenomenon of blocking chip or chip cannot be discharged will occur. According to the instantaneous force analysis of CFRP chip particle discharge process, the change of cutting tool speed and outlet negative pressure will affect the chip removal effect of internal chip removal tool. By using the fluid simulation software Fluent to establish the chip removal estimation model, the negative pressure value at the outlet of the internal chip removal tool for CFRP drilling for polycrystalline diamond, the relationship between the tool speed and the chip removal performance are obtained, and the chip removal performance of the tool is predicted. Finally, through the vacuum generator to complete the transformation of the suction pump, and then to complete the transformation of drilling machine tools, build the CFRP air-breathing internal chip drilling test system, under the design conditions, By comparing the time and effect of chip ejection in the actual drilling process of CFRP under different operating conditions, the chip removal performance of the developed inner chip discharging tool is evaluated and the accuracy of the simulation results is verified.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332
本文编号：2276222
[Abstract]:At the present stage, the main way to discharge chips produced by drilling of carbon fiber composite materials is the hand-held vacuum cleaner, which is inefficient, reduces the quality of CFRP hole making and pollutes the environment. As an important part of the air-suction self-draining system, the air-suction internal chip drilling tool can effectively solve the problem that CFRP chip can not be discharged in time. It has become the focus of the research on the chip removal technology of CFRP drilling at home and abroad at present. How to select reasonable drilling parameters and chip negative pressure under the premise of ensuring its chip removal performance has important practical value and practical significance. First of all, the structure and working principle of the suction internal chip removal system are described. The factors that affect the chip removal efficiency during CFRP drilling are analyzed. The special polycrystalline diamond chip removal tool developed by ourselves for CFRP drilling is taken as the research object. The flow control equation of chip removal simulation was established, the turbulence model in the flow channel of internal chip discharging tool and the near wall model were established. Secondly, on the basis of studying the properties of CFRP chip, the velocity of chip draining gas flow in the chip discharge channel is calculated. Based on the 3D modeling software of Fluent, the three-dimensional flow channel model of the chip discharging tool is established, and the mesh is divided by Gambit. The hydrodynamic simulation of internal chip drilling tool is carried out. In the process of simulation, the pressure coupling algorithm SIMPLEC is used to solve the calculation equation, and the numerical simulation of the air flow field in the tool is realized. The distribution of pressure, velocity and turbulent kinetic energy is obtained, and the chip removal characteristics of the cutting tool are analyzed and studied. Thirdly, the change of rotary speed and outlet negative pressure of internal chip drilling tool will affect the chip removal effect of internal chip removal tool, and then the phenomenon of blocking chip or chip cannot be discharged will occur. According to the instantaneous force analysis of CFRP chip particle discharge process, the change of cutting tool speed and outlet negative pressure will affect the chip removal effect of internal chip removal tool. By using the fluid simulation software Fluent to establish the chip removal estimation model, the negative pressure value at the outlet of the internal chip removal tool for CFRP drilling for polycrystalline diamond, the relationship between the tool speed and the chip removal performance are obtained, and the chip removal performance of the tool is predicted. Finally, through the vacuum generator to complete the transformation of the suction pump, and then to complete the transformation of drilling machine tools, build the CFRP air-breathing internal chip drilling test system, under the design conditions, By comparing the time and effect of chip ejection in the actual drilling process of CFRP under different operating conditions, the chip removal performance of the developed inner chip discharging tool is evaluated and the accuracy of the simulation results is verified.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332
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