The Forming Theory and Computer Simulation of the Rotary Cutting Tools with Helical Teeth and Complex Surfaces
This paper researched the forming theory of the cutting tools with helical teeth and complex surfaces. Deduced the nonlinear equations of the movement of NC system to generate such tools, presented the way to find the solution of the equations, calculated the cross section graphics of the teeth profile and computer simulation of NC machining.
A manufacturing model of carbide-tipped spherical milling cutters
Abstract The paper presents a manufacturing model for use in grinding the front-end surfaces of a carbide-tipped spherical milling cutter. The concepts of radial equidistant lines and oblique equidistant surfaces are presented. Based upon these concepts, a model of the cutting edge of a spherical milling cutter is derived by solution for the intersection of the spherical front-end surface of the cutter and the equation of a sphere. A special mechanism model is also presented for grinding the rear cutting-edge surface of the cutter. To ensure that the mechanism model is valid, the cutting-edge curve of the cutter is also on the rear cutting-edge surface. The associated geometric and manufacturing parameters are further optimized to ensure that the best quality of the carbide-tipped spherical milling cutter can be achieved. The mechanism is also used to study the manufacturability of spherical milling cutters for slightly varying specifications. A numerical example is presented to illustrate the effectiveness of the proposed modelling procedure for producing carbide-tipped spherical milling cutters. Numerical results indicate that the proposed manufacturing model and grinding procedure are capable of producing a family of carbide-tipped spherical milling cutters with an accuracy up to the user-provided specific tolerance. Some major contributions of the proposed approach are summarized in the conclusions.
NC data generation for 4-axis machine tools equipped with rotary angle head attachments to produce variable pitch screws
Abstract A kinematic model to generate the NC data for 4-axis machine tools equipped with rotary angle head attachments has been developed in order to produce a double threaded variable pitch screw. The 4 × 4 homogeneous transformation matrix is employed in the derivation of the ability functions of the machine tool and in the generation of the desired cutter locations. NC data equations are obtained by equating the corresponding elements of the ability function of the machine tool and the desired tool location matrices. The machine tool settings for a screw are investigated and then this screw is machined as an illustrative example. This general methodology is applicable to various types of cams possessing conical or cylindrical meshing element(s). It also combines the activities of design and manufacturing, thus making the production process more flexible, automatic, and controllable.