APPLICATION OF 3D MODELING METHODS TO EXTEND THE RANGE OF SHOE LASTS

Abstract

A shoe last determines the inner form of a footwear. Therefore, one of the primary tasks that arise while introducing CAD of footwear is to improve the method of designing the complex surface of the shoe last (the inner form of a shoe) to provide the effi cient use of CAD functions for this aim. The variet y
of modern shapes of shoe lasts complicates the task of developing their rational parameters. One of the ways to solve this problem is developing a combined shoe last that has a scientifi cally sound bac k part which includes the heel, instep and ball area, and  the convertible toe part. This solution will help
to fulfi ll the task of expanding the assortment range of the shoe lasts using basic ergonomic shapes. At the same time, the problem of joining two diff erent parts of a complex spatial shapes of the last is solved by using the methods of blending, morphing and construction of joining surfaces in the PowerShape software environment. Improving the range of the shoe last shapes using 3D modeling features. Scientifi c novelty. The method of modeling the ergonomic shape of a shoe  last of the necessary style  by
combining two parts of diff erent lasts using the surface and hybrid modeling features of PowerShape software. The development of the new last shapes based on the tested ergonomic designs ensures a good combination of comfort and aesthetics, creating the preconditions for the practical implementation of the idea of a universal last with a replaceable toe part.