麻花钻锥面后刀面线切割成形加工装置的设计

Wire cutting forming device design of flank face of conical twist drill

针对麻花钻锥面后刀面刃磨装置的复杂性及现有砂轮刃磨存在的问题,基于麻花钻后刀面刃磨理论的研究成果,提出了一种新的麻花钻锥面后刀面刃磨方法——数控电火花线切割刃磨(成形)方法,即用线切割成形代替砂轮刃磨。研究了麻花钻锥面后刀面线切割的成形原理,建立了麻花钻线切割成形方法的数学模型;确定了成形装置的运动方案,设计了装置的二维、三维模型图,最终设计了成形加工装置的数字样机模型,并进行了运动仿真分析,确定了运动方案的可行性;进行了模拟线切割试验,分析了电参数对成形过程的影响,选择了合适的电参数。该装置不仅可以实现后刀面刃磨,而且装置结构简单,易于操作,克服砂轮刃磨易烧伤等缺陷,对超硬材料麻花钻锥面后刀面刃磨加工具有重要的研究意义。

Aiming at the complexity of grinding device of twist drill conical flank face and the existed problems of the current grinding wheel, a new cone grinding method, that was numerical control electric spark wire cutting forming method, on the flank face of twist drill was proposed. The wheel grinding was instead of wire-cutting forming method. The wire cutting forming principle for conical flank of drill was studied. The mathematical model of wire cutting forming method of twist drill was established. The motion scheme of forming device, as well as the two-dimensional and three-dimensional model diagram of the device were determined. Finally, the digital prototype model of forming device was designed and the motion simulation analysis was performed. The feasibility of the motion scheme was determined and the simulation wire cutting test was carried out. The effect of electrical parameters on the forming process was analyzed and the suitable electrical parameters were selected. This device could not only achieve flank grinding but also with a simple structure and easy to operate. The defect of easy burning grinding wheel could be overcome. This was of significance in the grinding process the flank of conical twist drill of superhard materials.