Features of determining the tool profile for screw surfaces using cad systems

Abstract

In this work, a new original method of determining the profile of the initial tool surface was developed. This method is used in the development of tools for processing helical cylindrical surfaces of a constant pitch. This technique belongs to the graphic methods of profiling and differs from them in the application of the capabilities of CAD systems, namely, the determination of the parameters of the tool profile is not reduced to the usual use of such systems as a drawing board. According to the developed method, based on the kinematic scheme of forming the cutting process, the process of formation of the initial tool surface in space is simulated by means of 3D-modeling. Then using the generated 3D-model, the parameters of the tool surface corresponding to the selected processing scheme for helical surface are found. The use of this technique significantly reduces the time of preparation for production and simplifies the determination of the parameters of the initial tool surface by the engineer when solving such problems. Additional mathematical calculations are not required, since the input parameters are the 3D-model of the part to be manufactured. The paper describes in detail the definition of the surface parameters of a disk tool for machining the helical groove of a drill, as a typical example of processing helical surfaces. Also, the paper shows the determination of the parameters of the initial tool surface for a disk tool, an axial tool, a vortex method of processing, and processing by the end face of the tool. Examples of determination of the same helical surface with different processing methods prove the universality of the developed technique.

Keywords

• helical surfaces
• initial instrumental surface
• machining process screw surfaces