【作者】 汤鱼；

【导师】 邹平；

【作者基本信息】 东北大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 钻削在金属切削中应用很广,孔加工是最常用的材料切除方法之一。根据行业不同,其工序量达总加工工序量的20%-40%,所以,钻削加工技术一直是机械加工领域倍受人们研究的重要课题。常用的钻头是锥面麻花钻,但这种钻尖后刀面的加工机床刃磨运动关系较复杂,不便于准确控制钻尖的几何参数。本课题研究复杂螺旋面钻尖刃磨原理及刃磨技术,这种钻头刃磨时的运动关系简单,能够精确地控制刃磨参数。论文着重在以下几方面进行研究：(1)钻头及其刃磨技术的发展历程。评述几种常用钻尖后刀面的刃磨方法,提出研究螺旋面钻头的必要性和可行性研究。(2)钻尖是钻头承担切削的最重要部分,对钻头的研究主要是对钻尖的研究。针对常用钻头所存在的问题,从钻尖刃磨原理及其运动关系的分析入手,建立了钻头后刀面及前刀面的数学模型。(3)分析刃磨参数与钻头的几何参数的关系。(4)对复杂螺旋面钻尖的几何参数进行了分析,建立了一系列的几何参数的数学模型,从理论上分析了螺旋面钻尖的几何角度分布的合理性,这有助于对钻尖的参数进行分析和精确的控制。(5)实验分析。把根据本课题原理刃磨出的复杂螺旋面钻尖与其他钻尖一并应用到钻削实验中,通过改变刃磨参数,进行对比实验,同时对不同钻尖的钻削力及钻削质量进行分析。实验表明：复杂螺旋面钻尖与普通麻花钻钻尖相比,复杂螺旋面钻尖在靠近钻心处有较大的后角,并使横刃为“S”形,因此定心好,切入稳定,钻削轴向力小,具有比较好的排屑能力,并且所钻孔径与钻头的直径很接近,钻孔质量较好。更多还原

【Abstract】 Drilling is greatly applied in metal cutting. The hole-machining is one of the most methods for material machining. Drilling sequence amount achieves 20-40% of total machining sequences. Therefore, drilling technology is important research project in machining area.Nowadays, the usual drill is the conical drill. But the grinding motions of the machine tools are very complex for the conical drill and can’t exactly control geometric parameters of the drill points. This thesis is to study helical drill, which the motions of grinding are simple; the grinding parameters can be exactly control. The thesis study on the following area:Firstly, developing history of drill and grinding technology are reviewed. Grinding methods of flank surfaces of several usual drill points are discussed. The necessity and feasibility for researching complex helical drill are proposed.Secondly, drill point is the most important part of a drill for drilling. To research of drill is mainly to research of drill point. According to the defects of common drill points, analyzing of grind principle and its motion relation, a new kind of drill, which is called as complex helical point drill is established. The mathematical models of helical point are established.Thirdly, the relation of the grinding parameters and geometric parameters is analyzed.Fourthly, analyzing geometric parameters of complex helical drill point and developing their mathematic models, achieving distribution reasonability of geometric angles of the helical drill, it is helpful to analyze and exactly control the parameters of drill point.Fifthly, experiment analyzes. Complex helical drill point and common drill points are used in the drilling experiment, changing their grinding parameters in the contrastive experiment. We will analyze different drill points on the drilling force and drilling quality.It is clear that complex helical drill point has an "S" contour with a radiuses crown chisel, which reduces the thrust force and makes the drills self-centering. The S-shape chisel edge has a lower negative rake angle than a conventional chisel edge.更多还原