MM Science Journal, December 2020

December 2020

INFLUENCE OF INITIAL HOLE PREPARATION ON PROPERTIES AND LIMITS IN HOLE FLANGING

Jan Rihacek, Vaclav Zejda, Eva Peterkova, Michaela Cisarova
Keywords: forming | flanging | numerical simulation | PAM-Stamp | hole expanding test | S420MC steel

The paper deals with an analysis of a hole flanging technology, especially with the influence of an initial hole production process on an ability of material to achieve the required expansion in the application for automotive industry, i.e.radius rod production. S420MC steel sheet with a thickness of 4 mm is used as a material for the production of flanged parts. In this case, the possibility of improvi (…)

APPLICATION OF SIX SIGMA TOOLS IN THE PRODUCTION OF WELDED CHASSIS FRAMES

Michal Bucko, Vladimira Schindlerova, Ivo Hlavaty
Keywords: Six Sigma | Improvement Cycle | Lean Manufacturing | Weld | Defects

One of the most important activities in the management of companies is the continuous improvement of products quality concerning their sustainability and better market position. The submitted paper aims to optimise the production process in the production of weldments. The study revealed a significant number of dimensional and threaded defects on the welded chassis of the loader. One possibility of co (…)

FABRICATION PROCESS AND BASIC MATERIAL PROPERTIES OF THE BASF ULTRAFUSE 316LX MATERIAL

Jiri Safka, Michal Ackermann, Jakub Machacek, Martin Seidl, Filip Vele, Veronika Truxova
Keywords: additive manufacturing | fused filament fabrication | FFF | Metal printing | mechanical properties | SEM | sintering.

The presented article deals with the research of commercially available BASF Ultrafuse 316LX filament intended for processing by the Fused Filament Fabrication additive technology. This material contains a high proportion of metal particles. The aim of the research was to compare the resulting mechanical properties of the Ultrafuse 316LX not only with conventional rolled AISI 316L stainless steel, but a (…)

INFLUENCE OF THE VOLUMETRIC ACCURACY OF MACHINE TOOL ON THE WORKING SPACE SIZE

Michal Holub, Tomas Marek, Daniel Macala, Josef Bednar, Frantisek Bradac, Petr Blecha
Keywords: Machine tools | accuracy | volumetric accuracy | geometric accuracy | LaserTRACER

Volumetric compensation of CNC machine tools can provide a significant progress in increasing the production accuracy and hence the product quality. This paper describes the influence of the volumetric accuracy of the machine tool on the size of the working space. Impact assessment was performed on the basis of tests of three-axis vertical CNC machining center. In the practical part, the planning of the (…)

MECHANICAL JOINING OF ALUMINIUM ALLOY SHEETS

Lubos Kascak, Emil Spisak, Jan Slota, Janka Majernikova, Tomas Jezny
Keywords: tensile test | metallography | clinching | aluminium alloy sheets

Modern lightweight car bodies are becoming more and more complex in comparison with previous constructions. Various materials are used in particular areas of car bodies, serving different purposes. Constructions made of aluminium alloy sheets are widely used in car body production to reduce the total car weight. However, resistance spot welding is not applicable for joining aluminium alloy sheets. There (…)

VALIDATION OF THE DYNAMIC MODEL OF THE PLANAR ROBOTIC ARM WITH USING GRAVITY TEST

Monika Trojanova, Tomas Cakurda
Keywords: dynamics | Fluidic Muscle | Gravity Test | Planar Robotic Arm | Validation |   cartesian coordinates | AA5083 | AA 6061

The paper describes the validation of a dynamic model of a planar robotic arm using gravity tests. The drive of the arm (fluid muscles from the manufacturer Festo) was not activated during gravity tests (for the test was used only gravitation of solid). The measured data were obtained under the conditions that the joint angle was from 20° to 40°, the measurements were performed 10 times for each angle a (…)

A DEPTH IMAGE QUALITY BENCHMARK OF THREE POPULAR LOW-COST DEPTH CAMERAS

Vyomkesh Kumar Jha, Stefan Grushko, Jakub Mlotek, Tomas Kot, Vaclav Krys, Petr Oscadal, Zdenko Bobovsky
Keywords: Sensor Comparison | Depth Images | image processing | Image Quality

A depth camera outputs an image in which each pixel depicts the distance between the camera plane and the corresponding point on the image plane. Low-cost depth cameras are becoming commonplace and given their applications in the field of machine vision, one must carefully select the right device according to the environment in which the camera will be used given the accuracy these cameras can be associ (…)