BTA深孔钻削力学特性及钻杆稳定性研究

发布时间：2018-04-19 21:34

本文选题：BTA深孔钻 + 钻削力　；参考：《中北大学》2015年硕士论文

【摘要】：随着深孔加工技术在航空、兵器、冶金等领域的广泛应用，深孔加工的精度及稳定性方面的研究受到越来越多的重视。然而BTA深孔钻削加工状态多样，机理复杂，对BTA钻削系统力学特性及钻杆稳定性的研究成为了深孔加工中的研究热点和关键问题。因此本文将在前人研究基础上，对BTA钻的钻头和钻杆进行动力学及稳定性研究。本文首先对BTA钻进行了受力分析，建立了深孔钻削的力学模型，对BTA深孔钻削系统中的轴向进给力、转矩和功率进行了计算，，并针对BTA深孔钻削系统中四种不同类型的导向块的布置方案及钻头的稳定度进行了计算。其次用实例分析了中间齿位角的确定方法，齿后角及中间齿位角对钻削力及两导向块压力的影响，错齿钻的位置角及导向块的分布对钻头稳定度的影响。再次对BTA钻在钻削过程中钻杆的涡动情况进行了分析，对纯滚动时的钻杆运动轨迹进行了数学建模，对钻杆的典型涡动轨迹进行了仿真分析。最后利用达朗伯原理建立了考虑质量偏心、非线性刚度、动态钻削力及重力的钻杆非线性运动轨迹方程，并利用Matlab进行了仿真分析。本文对BTA钻头各刀齿和导向块角度的取值提供了一定的理论参考，为实际BTA钻头稳定性的验证提供了一种方法，同时研究了钻杆转速、相对阻尼以及质量偏心对钻杆稳定性的影响，对深孔加工技术的发展具有重要的现实意义。
[Abstract]:With the extensive application of deep hole processing technology in the fields of aviation, weapons, metallurgy and other fields, more and more attention has been paid to the research on the precision and stability of deep hole machining. However, the BTA deep hole drilling process is diverse and the mechanism is complex. The research on the mechanical properties of the BTA drilling system and the stability of the drill rod has become a hot topic in the deep hole processing. Therefore, this paper will study the dynamics and stability of drill bit and drill pipe of BTA drill on the basis of previous studies.
In this paper, the force analysis of BTA drill is carried out, the mechanical model of deep hole drilling is set up, the axial feed force, torque and power in the BTA deep hole drilling system are calculated, and the arrangement scheme of four different types of guide blocks and the stability of the bit are calculated for the deep hole drilling system of the deep hole drilling system. The method of determining the angle of the inter tooth position, the influence of the rear angle of the tooth and the angle of the middle tooth on the drilling force and the pressure of the two guide block, the influence of the position angle of the wrong tooth drill and the distribution of the guide block on the stability of the drill bit. Again, the vorticity of the drill rod in the drilling process of BTA drilling is analyzed, and the mathematical modeling of the trajectory of the drill rod in the pure rolling is modeled. The typical vorticity track of the drill rod is simulated and analyzed. Finally, the nonlinear motion trajectory equation of drill rod with mass eccentricity, nonlinear stiffness, dynamic drilling force and gravity is established by using the principle of Da Long Wave, and the simulation analysis is carried out by Matlab.
This paper provides a certain theoretical reference for the value of the angle of the BTA bit and the guide block. It provides a method for the verification of the stability of the actual BTA bit, and studies the influence of the drilling rod speed, relative damping and mass eccentricity on the stability of the drill rod, which has important practical significance for the development of the deep hole processing technique.

【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG52

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