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This paper presents the results of experimental studies on the correlation between the abradant composition and the abrasive capabilities of grinding wheels made of submicrocrystalline sintered corundum during finishing grinding of the surfaces of samples made of corrosion-resistant steel. The abrasive capabilities of grinding wheels were determined in accordance with the classical and modified Lurie...
The article deals with the mathematical model of the primary contact of a milling tool in face milling. When designing the mathematical model, there were taken into consideration positive and negative geometry of the cutting wedge with different angle of taking instrument. Mathematical model is the input for experimental verification of the primary contact of milling tool and is aimed at improving...
This paper is concerned with building a rule base in the method based on genetic fuzzy systems to control robotised manufacturing systems. The suggested method of building a rule base employs a genetic algorithm, or more precisely, a chromosome coding algorithm. Widely used methods of chromosome coding have their faults, which make it necessary for the methods to extend their block diagrams of the...
The article presents a criterion supporting the selection of the proper number of sensors in a system compensating the effect of thermal deformation of the feed screw on the positioning accuracy of the CNC axis. Moreover, it presents an experimental verification of the criterion and a calculation example along with the tips allowing for the practical use of the criterion.
Most technological machines generate vibrations which are transferred to either support systems or foundations. To ensure an object's safe operation, it is necessary to have adequate knowledge about dynamic properties of both machines and a supporting construction. A steel-concrete composite floor is an example of a supporting construction. It consists of steel beams connected with a reinforced concrete...
The paper presents example of hard turning application, comparison with grinding technology and results of hard turning researches on cold work tool steel with cubic boron nitride tools. The influence of cutting conditions and material hardness on cutting forces and surface roughness are presented.
The paper contains the description of basic technological setups for conventional milling machines and for 6-axes CNC machines for Gleason spiral bevel and hypoid gears. Cartesian reference system are discussed for Gleason's series Phoenix CNC machines. Numerically controlled machines allow cut and grind the generated and formate spiral and hypoid bevel gears in all technological methods.
This paper presents the experimental results of the role of ball burnishing in improving of the surface integrity produced in finish hard machining of hardened 41Cr4 steel. The characterization of the surface integrity includes two standardized sets of 2D and 3D roughness parameters, the distributions of microhardness, residual stresses and the microstucture of the sublayer which was examined using...
The paper presents Pareto-optimum method and POLOPT computer program enabling, with the use of principle of conversation with computer, assessment of solutions (variants) in the view of two or more criteria (up to 10). The Pareto-optimal set is univariate in a few cases only, and therefore, in remaining cases to selection of the best solution from this set one proposed the distance function. The chosen...
Using methods of planning automating of production processes as well as artificial intelligence, the methods presented in this paper were constructed for identifying the set value of manufacturing process parameters, which are key to evaluating the costs of the designed elements. The proposed solutions were adapted for systems used under the conditions of unit and small-batch production.
This paper presents a fuzzy approach to automatic feed rate correction during rough turning with inconstancy of both depth of cut and machinability of material. Additional sensors are not required in this approach. It makes use of modern numerical controllers. In every interpolator (IPO) cycle, a new adaptive value of feed rate is activated by means of synchronous actions based on current power consumption...
The paper presents selected aspects of production management related to the product customization. Product customization leads to an exponentially increased number of product and process variants, which exaggerates the difficulties in manufacturing in make-to-order production systems. The direct consequence of product customization on production is evidenced by an exponentially increased number of...
In the paper is presented an attempt of assessment of melting and modification effect on Rm tensile strength of Al-Si alloys poured into metallic moulds. Investigated alloys underwent refining and modification with AlSr10 master alloy. Run of the crystallization process was presented with the help of solidification curves, making use of thermal-voltage-derivative analysis (ATND). Obtained results...
The paper presents results of multicriteria optimization of hard finish turning operation parameters of hardened 18CrMo4 steel in a view of chosen parameters of surface roughness. The following cutting parameters were subjected to the optimization: vc, f and ap, while as optimization criteria were assumed selected parameters of surface roughness: Ra, Rz and Rmax. The research was performed with the...
The aim of the present study has been designing and putting in operation of a stand for Sonic Testing equipped with modern and readily available digital devices and with the author's own computer program, which enables recording and analysis of acoustic fields and of the frequency of free vibrations in selected castings made from Fe and Al alloys, and specifically also from magnesium alloys, and mastering...
The paper presents results of non-ferrous metals crystallization tests performed with use of the ATND method. Method of analysis of non-ferrous metals crystallization gives complete picture of arisen structural components of alloys. Particular structural components of alloys investigated with use of the ATND method were verified in x-ray microanalysis, what unequivocally confirmed their presence....
In the paper, there is presented the practical application of the modelling and simulation in managing and planning of machines' setup. There are described principles and stages of the production system improvement with the theory of constraints (TOC) and illustrated by the example of analysis of the whole production line, which aim was the bottleneck determining, and the analysis of operations, which...
The paper presents problems of technical product preparation tasks aimed at product selection and redesign for particular application supported by Al methods. The identification of customer needs was discussed, as well as the issues of product decomposition were presented. The QFD method was suggested to be applied as the product and process data integration tool, where the engineering characteristic...
The paper presents proposals of algorithms for the control software for measuring arms equipped with the contactless probes (so called „V-probes”) as well as algorithms for bended elements' manufacturing-accuracy evaluation. The working principle of the V-probes is described. The critical analysis of the accuracy requirements specification for the bended elements is carried out. The typical measuring...
The paper presents the structure of a complex system for supporting a decision making process in machining data selection in turning operations. It is assumed, that the system modules cooperate with each other, utilize data and knowledge bases through the information bus. The system proposes to use on line information from visual monitoring module equipped with high speed camera what enables to observe...
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