A precision design and NC manufacturing model for concave-arc ball-end cutters

Having first defined the helical angle as the angle between the cutting edge and the axis of rotation of the cutter, this paper then presents design models for producing the cutting edge and groove of a ball-end cutter with concave-arc generator. The relative feed speeds of the grinding wheel in the radial and axial directions during NC machining of the cutter are derived based upon a given speed of rotation. The feed speed of the grinding wheel in the radial direction is modified according to the cross section of the groove that passes through the center of the cutter sphere. The paper presents a method for manufacturing a concave-arc ball-end (CABE) cutter using a 2-axis NC machine. The models that are used to calculate the actual obtained groove and the computer simulation method are also included. To further enhance the accuracy of the mathematical models, a compensatory machining process that eliminates residual profile on the revolving surface is presented. This paper provides a valuable reference for the design and machining of this cutter type.     

基于PCBN刀具的陶瓷模具数控加工

简述了PCBN刀具的性能和制造方法，并分析了陶瓷模具的特点和加工工艺，提出了用PCBN刀具硬态数控切削加工复杂陶瓷模具型面的工艺，实际应用证明利用PCBN刀具在数控机床上可以有效经济地对一些复杂型面的产品和模具进行加工。