提高机壳零件加工中台阶钻孔的处理效率

O. Miroshnychenko, I.S Huzar
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摘要

工作目的:研究台阶钻在复杂形状难加工的人体部位钻削的动态过程。提出了改进工艺的有效途径。方法:采用有限元法建立零件钻孔的数学模型,并通过改变切削模式的不同参数来分析加工过程。结果:对影响切削过程的因素进行了分析。在复杂的、难以加工的零件上加工孔时,使用阶梯钻的优点得到了证实。建立了有限元钻削过程的数学模型。研究了不同切削模式参数变化下的动态钻孔过程,得到了工件加工过程中刀具运动和应力的数据。结果表明,随着切削速度的增加,作用在钻头上的轴向力也随之增大。因此,由于进给驱动的特性,增加了刀具的进给速度,也增加了切削力,以及钻头的热力学负荷,这降低了它的稳定性。已经确定了钻头切削刃上最大应力的位置,这可以影响所得到的孔的质量,钻头的强度和稳定性。科学的新颖性:建立了台阶钻加工困难零件的数学模型。实际意义:对步进钻头的使用提出建议,提高刀具稳定性和加工精度的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
IMPROVING THE EFFICIENCY OF TREATMENT OF HOLES WITH STEPS DRILLS IN THE PROCESSING OF HOUSING PARTS
Purpose to work: to study the dynamic process of drilling with step drills in difficult-to-machine body parts of complex shape. The effective ways to improve the processing are suggested. Methodology: to create a mathematical model of drilling a hole in the part by the finite element method and to analyze the machining process by varying the different parameters of the cutting modes. Results: the analysis of the factors influencing cutting process is done. The advantages of using a step drill when machining holes in complex, difficult-to-machine parts are substantiated. A mathematical model of the finite element drilling process has been developed. The dynamic drilling process according to different variation of cutting mode parameters is investigated and the data on tool movement and stresses arising in the process of work piece processing are obtained. The results obtained indicate that as the cutting speed increases due to the increase in forces, the forces acting on the drill in the axial direction increase. Thus, due to the properties of the feed drive, increasing the feed rate of the tool, it also increases the cutting forces, as well as the thermodynamic loading of the drill, which reduces its stability. The locations of the largest stresses on the cutting edges of the drill have been identified, which can affect the quality of the resulting hole, the strength and stability of the drill. Scientific novelty: the mathematical model of processing of a difficult detail by a step drill is developed. Practical significance: recommendations on the use of step drills and the possibility of increasing the stability of the tool and the accuracy of processing.
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