碳纤维复合材料钻削过程中轴向力与钻孔质量的研究

发布时间：2018-05-02 19:48

本文选题：碳纤维复合材料 + 钻孔质量　；参考：《天津理工大学》2017年硕士论文

【摘要】：碳纤维复合材料是一种已经广泛应用于各个领域的难加工材料,并且由于铆接和螺接等机械连接方式是目前CFRP构件之间主要连接方式,需要加工大量的装配连接孔,而这些连接孔的质量直接制约着装配体的安全。因此对CFRP钻孔质量进行研究很有必要。本课题选用T300型CFRP作为研究对象,由于目前CFRP容易出现加工缺陷等问题,本文进行了CFRP钻削试验和有限元仿真,对钻削CFRP过程中的轴向力和钻孔质量进行了系统研究。(1)探究得到了钻削CFRP时的钻削力的主要来源以及钻削各阶段变化规律。并分析了钻削CFRP过程中孔壁粗糙度以及出口撕裂的产生机理。(2)构建了硬质合金钻削CFRP试验平台,选择合理的钻削参数进行了硬质合金钻头钻削CFRP试验,在试验中采集轴向力、粗糙度以及撕裂值。并对钻削试验数据运用极差法分析,得到三个因素对轴向力、粗糙度以及撕裂的影响规律。(3)基于ABAQUS有限元软件,建立CFRP钻孔有限元模型性并对进行修正,得到可对CFRP钻孔轴向力进行准确预测的有限元仿真模型。运用仿真模型进行正交试验,并运用MATLAB软件对仿真结果进行回归分析,建立钻削轴向力关于钻头直径、主轴转速以及进给量的预测模型,并通过误差分析和显著检验来保证所得到的预测模型的正确性。(4)建立了关于轴向力的粗糙度以及撕裂的预测模型,得到孔壁粗糙度与钻削轴向力近似呈线性关系,出口撕裂与钻削轴向力近似呈二次关系,然后通过MATLAB软件对试验数据进行回归分析得到数学模型,并对数学公式进行误差分析,最后进行试验来检验所得到的数学预测模型具有一定的可靠性与实用性。
[Abstract]:Carbon fiber composites (CFRP) have been widely used in various fields of refractory materials, and because of the riveting and snail connection is the main connection between CFRP components, a large number of assembly connection holes need to be processed. The quality of these connection holes directly restricts the safety of the assembly. Therefore, it is necessary to study the drilling quality of CFRP. In this paper, T300 CFRP is chosen as the research object. Because the CFRP is prone to machining defects and other problems, this paper carries out the CFRP drilling test and finite element simulation. The axial force and drilling quality during CFRP drilling are studied systematically. 1) the main source of drilling force and the variation law of drilling process in CFRP are obtained. At the same time, the roughness of hole wall and the producing mechanism of exit tear during CFRP drilling are analyzed. The CFRP test platform of cemented carbide drilling is constructed. The reasonable drilling parameters are selected to carry out the drilling CFRP test of cemented carbide bit, and the axial force is collected in the test. Roughness and tear value. The influence of three factors on axial force, roughness and tear is obtained by using range method. Based on ABAQUS finite element software, the finite element model of CFRP borehole is established and modified. A finite element simulation model for predicting the axial force of CFRP borehole is obtained. The orthogonal test is carried out by using the simulation model, and the regression analysis of the simulation results is carried out by using MATLAB software. The prediction model of drilling axial force on bit diameter, spindle speed and feed rate is established. The prediction model of roughness and tear of axial force is established by error analysis and significant test to ensure the correctness of the prediction model. The approximate linear relationship between the roughness of hole wall and the axial force of drilling is obtained. There is a quadratic relation between the exit tear and the axial force of drilling. Then the mathematical model is obtained by regression analysis of the test data by MATLAB software, and the error of the mathematical formula is analyzed. Finally, the mathematical prediction model obtained by testing the model has certain reliability and practicability.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332

【相似文献】