Radovan Holubek

The Possibilities of Increasing the Flexibility of Intelligent Assembly Cell

In relation to how the complexity of modern assembly technology increases, requirements for precise, fast and relevant information specifically for the assemble process also increase. Automation allows the fast and precise measurement of various parameters, assessment of the values obtained and the implementation of the required measures in real time. Automation tools allow evaluation, parameter measurement, comparison and application via computer technology and various software resources. One of the aims of the VEGA 1/0206/09 Intelligent assembly cell project solution as per our institute is the creation of a means of forming assembly cells, their duly defined critical placements, verification of the assembly process as a dynamic system of consistency from a technological, handling and control sub-system point of view via means of 3D models in CATIA environment software. Authors of this paper are members and experts of project group (VEGA 1/0206/09) interested in robotics, manipulators and technological devices. Whereas mechanical production trends in the 21st century tend to focus more on resilience and flexibility, the authors of this article have taken into consideration the possibility of re-evaluating the above-mentioned data — which is an essential element in terms of raising flexibility, thus definitively contributing to increased competitiveness.Copyright

Offline Programming of an ABB Robot Using Imported CAD Models in the RobotStudio Software Environment

Current trend in automation area is focused to the innovation in all fields of the technologies and technological devices. Probably industrial robots and manipulators belong to development too. Industrial robots and manipulators belong to progressive elements of automation. Modern concept uses the offline programming as a tools integration of the virtual CAD models into programming environment. Offline programming carries a lot of advantages for example possibility of the programming without real robot system, possibility of the collision state debugging. Implementation of CAD models in virtual environment of Robot studio achieves better workplace station of creating robotic system and also it generates rather trajectories of the robot path in this system.

On the possibilities and the advantages of robot off-line programming Teaching of off-line programming methods as a tool to further industrial implementation utilization

Current trend in automation area is focused to the innovation in all fields of the technologies and technological devices. Probably industrial robots and manipulators belong to development too. Industrial robots and manipulators belong to progressive elements of automation. Modern concept uses the offline programming as a tool integration of the virtual CAD models into programming environment and implementation to the education process. Offline programming carries a lot of advantages such as possibility of the programming without real robot system, possibility of the collision state debugging. Implementation of CAD models in virtual environment of Robot studio achieves better workplace station of creating robotic system and also it generates rather trajectories of the robot path in this system.

Layout Redesign and Material Flow Analysis at a Flexible Assembly Cell Supported by the Use of Simulation

This paper essentially emerges from scientific and teaching needs of a university institute while trying deepen into a more formal analysis and/or design process of the material flow and associated manufacturing decisions, e.g.: the layout. Fulfilling such needs, the paper makes allusion to key manufacturing decisions associated to the material flow, while stressing the fact of their mandatory consideration when integrally addressing the primary problem. A partial application of the ideas takes place at a flexible assembly cell of the institute; some of the main results of it are: (1) a more formal description of the whole cell including alternative material flow scenarios, (2) the proposal of a new scenario implying the redesign of the cell conception, i.e.: the layout and thus material flow itself, (3) the simulation and comparison of material flow scenarios selecting the best one in terms of both the MF and layout, among others. At the end, the integration of all these previous elements clearly contributed to the solution of the research’ problem and objectives traced within the frame of the research.

Incorporation, Programming and Use of an ABB Robot for the Operations of Palletizing and Depalletizing at an Academic Research Oriented to Intelligent Manufacturing Cell

The current trend of the final product quality increasing is affected by time analysis of the entire manufacturing process The primary requirement of manufacturing is to produce as many products as soon as possible, at the lowest possible cost, but of course with the highest quality. Such requirements may be satisfied only if all the elements entering and affecting the production cycle are in a fully functional condition. These elements consist of sensory equipment and intelligent control elements that are essential for building intelligent manufacturing systems. Intelligent manufacturing system itself should be a system that can flexibly respond to changes in entering and exiting the process in interaction with the surroundings. Philosophy that we apply to solve the problem rise from intelligent assembly cell by building on our institute of manufacturing systems and applied mechanics Essential philosophy is integrate of interconnection between palletizing- depalletizing robot and Intelligent assembly system by the means mobile robot Robotino.

Virtual Commissioning of a Robotic Cell Prior to its Implementation Into a Real Flexible Production System.

Abstract With the rise of the Industry 4.0 and the digitization increase in the field of design of the automated devices and systems, raises the requirements to digitize all stages of the design processes, including Virtual Commissioning. This technology allows to verify the functionality of the device and/or systems, generate OLP programs for robots and test the functionality of the PLC code on the virtual model. The article presents research into the possibility of implementing a robotic cell into a real flexible production system in the Laboratory in order to eliminate defective products after an automatic control through the Quality-handling station. This technology was verified on the basis of a methodology through a virtual system model and a virtual control system in the Software-in-Loop using the Siemens Tecnomatix Process Simulate software.

Using Virtual Reality as a Support Tool for the Offline Robot Programming

Abstract The present article focuses on the possibilities of using Virtual Reality (VR) as a supporting tool by using the offline programming method for industrial robots. The philosophy of using such a process is hierarchically linked to the observance of methodological procedures for the proposal new workstations with using industrial robots. First, it is necessary to develop CAD models of the projected workplace, which can be imported into a suitable simulation environment for the creation of robotic simulations with support for visualization to the immersive VR environment. In our case, the CAD software Catia was used to develop a workstation, followed by integration of the CAD database into the simulation environment of Process Simulate (PS). Support for the visualization in the immersive environment of the Virtual Reality of Process Simulate was vested using the glasses headset HTC VIVE.

Integrative Programming of Production and Preventive Maintenance Tasks in an Environment of Identical Parallel Machines: Proposal of a Construction Heuristic

Abstract The article presents a constructive heuristic for the integrated programming of production orders and preventive maintenance (PM) interventions in an environment of identical parallel machines, aimed at minimizing the completion time of the last scheduled job (makespan). Unlike other proposals found in the literature, the one here considers that the time between preventive interventions is not previously known, but instead, this is assumed as one of the decision variables of the system in the beginning of each of these interventions; in addition, the proposal also considers the possibility that not all jobs have the same release time. The design of the heuristic algorithm is based on the general approach of the Longest Processing Time dispatch rule, with a slight modification in its conception to consider the random character of the equipment failures and their impact on the execution time of the tasks. Consequently, a simple dispatch rule called rj - LPT was also proposed to comply with one of the steps of the heuristic, as well as an algorithm to determine the minimum dimension for the makespan, which constitutes the basis of the stop criterion linked to the initial solution.

Measuring and evaluating the differences of compared images for a correct car silhouette categorization using integral transforms

Abstract The present paper focuses on the analysis of the possibilities of using integral transforms for measuring and evaluating the differences of compared images (car silhouettes) with the purpose of a correct car body categorization. Approaches such as the light intensities frequency change, the application of discrete integral transforms without the use of further supplementary information enabling automated data processing using the Fourier-Mellin transforms are used within this work. The calculation of the several metrics was verified through different combinations that implied using and not using the Hamming window and a low-pass filter. The paper introduced a method for measuring and evaluating the differences in the compared images (car silhouettes). The proposed method relies on the fact that the integral transforms have their own transformants in the case of translation, scaling and rotation, in the frequency area. Besides, the Fourier-Mellin transform was to offer image transformation that is resistant to the translation, rotation and scale.

On the Effect of the Cutting Speed of a Water Jet Abrasive Cutting Process on the Surface Morphology of the Low Carbon Steel S235

In order to increase the cutting and breaking capacity of abrasive water jet machining (AWJM), abrasive particles are usually added to water. The AWJM technology is generally used for harder and heavier machinable materials like thick sheets, composite materials with metal and ceramic properties and others within these categories to just cite a few. The contribution is mainly focused on the analysis of the surface properties of the steel S235 after the cutting process, and this depending on the cutting speed of the water jet. Three different cutting speeds were used for the analysis because this cutting parameter significantly affects the resulting quality of the machined surface. A contact profile method was used to analyze surface roughness. The observed surface roughness parameters were the Ra, Rt and Rz respectively. The above-mentioned surface roughness parameters were measured in three positions, i.e.: at the inlet, middle and exit positions of the water jet with respect to the machined material.