IMPROVE PRODUCTIVITY THROUGH DIGITAL MANUFACTURING

In the future the digitalization and "Industry 4.0” will be in every step of the product lifecycle from design to the manufacture, service, and maintenance. Through digitalization, the companies will be able to operate and program the complex CNC machine tools that will be ready to respond more flexibly to the market demands and at the same time to boost their productivity. Work preparation and production can be breaking down further into additional process steps, ranging from tendering to quality assurance. The demand for digitalization solution can be illustrated thru the following targets and questions what every production company must define and establish: 1. How long time will be the part on the machine to be manufacturi; 2. Is that CNC machine tools (what is able and have the technical characteristics) available; 3. Are necessary new cutting tools for this new job; 4.The CNC operator is familiar with the CNC control equipment; 5. Does the workpiece tolerance correspond with the customer specifications. Is not so easy to link up all this requests and to find the best solutions in time and to have high productivity. Digital manufacturing will give us the preliminary units costs and delivery deadline that must be determined to be able to tender for a job correctly. Today, the amount of time a workpiece will require for machining can be calculated quickly reliably and very important, without trial runs, using CNC simulation solutions. This recommendations from our paper can be an answer at the production companies and the advantage of this implementations is that can be made step by step. The solution of this implementation should be in concordance with the company’s requirements and resources.

THE EFFECT OF CUTTER PATH STRATEGIES ON SURFACE ROUGHNESS WHEN MACHINING TITANIUM ALLOY

The article deals with the comparison and evaluation of finishing cutter path strategies when applied to one of the difficult to cut material such as Ti-alloy. The titanium alloy has been increasingly used for high performance application for oil and gas, aerospace, energy, medical and automotive industries. The importance of milling strategies outgoing from their impact on the economic aspects of production, realized using CNC machines. A planar sample was designed for the purposes of the experiment, enabling finishing cutter path strategies for shaped surfaces. Three cutting strategies were involved and compared- spiral, constant Z and line feed. For assessment of the effect of the cutting strategies three different feed rate were used. Comparison of simulated cutter path strategies and machined surface were visually inspected as well as measured surface roughness were evaluated. The constant Z cutting path strategy was found as suitable cutting strategy from point of view of surface roughness.

ANALYSIS OF MECHANICAL VIBRATION OF A SERVOMOTOR USING VIBROMETRY

The servomotor must ensure resistance to the environment (mechanical vibration, humidity, temperature) in which it will be operated. It is the vibration that is one of the important monitored parameters that allow obtaining initial information about the operational status of the equipment. Exceeding the preset limits adversely affects the service life and reliability of the components. The experimental part is focused on recording and analyzing the magnitude of vibration acceleration, through frequency spectrum and its comparison with the envelopes of frequency spectrums. The obtained graphical dependencies from the experiments are a suitable basis for the assessment of the objective state.

ANALYSIS AND TRENDS OF THE CHANGES IN THE GRAPHIC INTERPRETATION OF THE QUALITY COSTS MODELS

This paper presents four approaches to the graphic interpretation of the quality costs structure definition models: classical, modern, modified, and visionary approach. These give rise to theoretical graphic quality costs models and illustrate the relationship between the quality costs categories, as well as the relationship between the quality costs categories and the total quality costs and the quality level. The paper comparatively analyzes the underlying assumptions, existing knowledge, and principles characteristic of each approach. This contributes to the shaping of the quality costs categories curves and the overall quality cost curve in the theoretical models. The conducted analysis in the paper will enable forecasting the trend of development of theoretical graphic models and identification of potential stakeholders that contribute to changes in the structure and the behavior of the quality costs categories, and thus the behavior of the overall quality costs.

EFFECT OF CUTTING PARAMETERS ON CUTTING FORCES IN TURNING OF CPM 10V STEEL

The objective of this paper is to investigate the effect of cutting parameters on cutting forces during turning of CPM 10V steel with coated cutting tool. Machining of CPM 10V steel and finding a suitable tool is very challenging due to its physical and mechanical properties, especially since the machining of this material has not been extensively researched. The experiments were carried out using an Index GU -600 CNC lathe and the cutting forces were measured in process. A three-factorial three-level experimental design was used for the experiments. Statistical method analysis of variance (ANOVA) is applied to study the effects of cutting speed, feed rate, and depth of cut on cutting forces. The results of this study show that depth of cut has the most significant effect on main force and radial force, while feed rate and cutting speed have the most significant effect on feed force. The developed model can be used in the machining industry to predict and analyze cutting parameters for optimal cutting forces.

METAL CUTTING IS IT STILL OF INTEREST TO ANYONE?

For almost 100 years, the phenomena in the metal cutting process have offered researchers in the field a wide range of research topics, and at the same time, as much satisfaction, both in terms of deepening theoretical knowledge, especially in terms of the practical results obtained. Interest in this field has declined dramatically, however, since the beginning of the third millennium. Has the cutting process reached the limits of knowledge by their exhaustion or has it become inefficient for industry compared to other new processes for manufacturing metallic, non-metallic materials and composites? Why is the field no longer as attractive to researchers? Here is what this paper tries to clarify and propose to researchers in the field to reinvent the approach of the cutting process, as an incomplete explored and still excellent perspective, not only for the manufacturing industry, but also for the theoretical foundations of the cutting phenomenon.

APPLICATION OF THE METAHEURISTIC TUNICATE SWARM ALGORITHM IN SOLVING APPLIED MECHANICS PROBLEMS

In this paper, the principles of a metaheuristic algorithm based on tunicate swarm behavior are shown. The Tunicate Swarm Algorithm (TSA for short) was used for solving problems in applied mechanics (speed reducer, cantilever beam and three-dimensional beam optimization). In the end, a comparison of results obtained by TSA and results obtained by other methods is given.

TOOTH CONTACT ANALYSIS OF A DESIGNED PLANETARY GEAR DRIVE FOR THE VEHICLE INDUSTRY

A planetary gear drive consists of a sun gear, planet pinions and an internal gear. We designed a complex gear system which is usable in the field of the vehicle industry into the automatized robots. The system was designed by GearTeq software which is connected with the SolidWorks designer software. After the assembly and the motion simulations tooth contact analysis (TCA) was made to analyse the normal stresses and the normal deformations on the connecting surface of the planet pinions and the internal gear by different load moments.

APPLICATION POSSIBILITIES OF DYNAMIC VALUE STREAM MAPPING IN PRODUCTION LOGISTICS

An increase in the number of product types required by customers results in an increase in the complexity of logistics systems. This finding is particularly characteristic of production logistics systems, where the use of flexible production systems is becoming increasingly important. One of the defining tools for the development of these processes is the value process mapping method, a static version of which suitable for the simultaneous examination of a product family has become widespread in corporate practice. The paper presents the method of dynamic value stream mapping, which is also suitable for the examination of complex logistics systems, exploring its steps and the possibilities of its application in production logistics. An example prepared using the VSM module of the Plant Simulation framework is also presented to illustrate the application of the method.

EXCHANGE CURVE-BASED INVENTORY POLICY ANALYSIS OF NON-REUSABLE INDUSTRIAL PACKAGING IN PRODUCTION

The well-chosen inventory policy has a great impact on the performance of production and logistics processes, because it can influence not only the reliability, the cost efficiency, and the sustainability of the processes and resources, but packaging system can force the quality of products and processes. Within the frame of this article an exchange curve-based analysis method of packaging related inventory policy is described. This analysis method makes it possible to highlight the problems in inventory policy and find an improve solution in both macro- and micro-level. The computation method is based on the exchange of annual order cost and average inventory investment, especially in the case of economic order quantity-based packaging order policies.