International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

With the development of the world, innovative technologies are increasingly used for the purpose of faster, higher quality and cheaper production of machine parts and household materials. Advantages and disadvantages of conventional and innovative production of metal and polymer products are presented, as well as the possibility of replacing metal parts with plastic ones. The mechanical parameters of different types of materials produced through traditional and innovative production are compared. The comparative analysis shows that both conventional and modern 3D manufacturing have their place in modern industry, taking into account all factors and applications.

In the presented paper is examined the need for digitalization of cultural and historical sites. Approaches for 3D digitalization by using 3D scanners and photogrammetry are presented. A 3D printing of digitalized objects is accomplished. The photogrammetry method is examined and used as a possible solution for the digitalization and creation of 3D models. The models can be explored by visually impaired people. A monument from the Cultural and Historical site of Bulgaria is 3D digitalized and 3D printed by using a drone, photogrammetry software, and 3D printer.

This paper discusses the programming and control of a multi-cycle tape machine. Part of the electrical equipment is also presented. The program code in the language “Lader diagram” is selected and the input-output diagram is described. “Lader diagram” is a programming language designed to resemble an electrical circuit. Due to this fact, it has a great advantage over other programming languages, because electrical logic is easy and simple to present. Most of the programs in discrete automation are created on the “Lader Diagram” due to the simple operation and easy maintenance. The description and the cyclical approach of each executive body and automatic mode of operation are presented.

This article analyses the widths and thicknesses of the test specimen after operating the punch before sharpening the guillotine blades. The principle of operation of a 3D computer tomograph with an accuracy of 3μm is considered. The analysis will be performed in two ways: by using a micrometer and a caliper and by using a 3D computed tomography for determining the width and thickness

In the present article, a comparative analysis of the widths and thicknesses of a test specimen prepared by punching a hydraulic press before and after sharpening the guillotine blades is made. The types of characteristics of the punch are considered. The comparative analysis was performed by a non-destructive method using a 3D computed tomography.