【作者】 郑小虎；

【导师】 傅蔡安；

【作者基本信息】 江南大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 为了提高钻头的切削性能,人们从几何形状和钻头的材质材料两方面对钻头进行了不断的改进。到目前为止,已经出现的钻型有上百种,常用的也只有十几种。这主要是因为很多钻型刃磨复杂,没有实现机械刃磨。要发明一种新型钻型,首先应该对其数学模型进行详细的研究,为实现机械刃磨打下理论基础。这其中最重要的是对后刀面的数学模型及刃磨进行研究。锥面刃磨法是一种常用的后刀面刃磨法,但当刃磨参数不合理时,锥面刃磨法会产生翘尾现象。螺旋面刃磨法容易实现,不存在翘尾现象,但通过它刃磨出的钻心强度不高。本文从现有的后刀面刃磨法-锥面刃磨法和螺旋面刃磨法出发,提出了新型后刀面刃磨法-螺旋锥面刃磨法,并对螺旋锥面刃磨法进行了改进,又提出新的的螺旋锥面刃磨法。为了验证经过新型后刀面刃磨法的钻头的综合性能,先在三维软件中建立了通过新型刃磨法得到的钻心模型,测量了圆周后角的分布,并与其它的刃磨方法得到的圆周后角分布进行了比较,从中看出新型刃磨法在提高钻心强度的同时防止了翘尾现象的产生。其后利用Deform3D软件进行了切削仿真模拟,比较了两种刃磨法钻头的切削性能,从中看出新型刃磨法的钻头切削性能较好。为了实现新型刃磨方法的机械刃磨,本文在现有机械刃磨技术的基础上对新型螺旋锥面刃磨法的机械刃磨进行了初步的探讨,为实现新型刃磨法的机械刃磨奠定了基础。更多还原

【Abstract】 In order to advance the cutting property of drills, the geometric shape and material are advanced constantly. Up to now, there are over a hundred of drill shapes and over ten of them are widely used, it is because many drill shapes are too complicated to achieve by mechanical sharpening method. In order to invent a new drill shape, we must set up its mathematical model and study it carefully. All the work are the basis of achieving mechanical sharpening. The research on flank’s mathematical model and sharpening method are the most important part of achieving mechanical sharpening.The cone sharpening method is a widely used method. But the the phenomenon of the tail’s raising of the conical drill will appear when the sharpening parameters aren’t proper. The helical sharpening method can be achieved easily, but the drill’s core produced by this method was not strong enough. So a new sharpening method- helical cone sharpening method has been put forward in this paper on the basis of the conical method and helical method. After that a new helical cone sharpening method is put forward by advancing helical cone sharpening method.In order to tset the comprehensive properties of the drill, the 3D model of the drill’s cone has been established in CATIA and the distribution of the circumferential clearance angle is measured. The strength of the cone is increased and the phenomenon of the tail’s raising is avoided through the result of the test. After that, the cutting properties of the two sharpening method is compared through the cutting FEM simulation in Deform3D. We draw a conclusion that the cutting properties of the drll sharpened by the new helical cone sharpening method is better than conical method and helical method.In order to achieve the mechanical sharpening method , a preliminary study on new helical cone sharpening method is done on the basis of the existing mechanical sharpening method.更多还原