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This paper presents the characteristic of the production of sheet metal roofing tiles. The basic problem affecting the quality of the product was identified to be the repeatability of the metal sheet positioning and the cross ribbing. A measurement and control system was proposed for controlling the movement of the metal sheet and to automatically correct positioning errors. Presented results illustrate...
The paper discusses issue of selection of oscillatory shot peening parameters in terms of layout of microgrooves and surface coverage by the microgrooves. There are presented results of modeling and simulation of such method of burnishing, aimed at optimization of processing parameters. Computer program developed on the base of calculation algorithms for relevant parameters of the oscillatory shot...
This paper aims at characterizing the frictional behaviour at the cutting tool-workmaterial interface during the dry machining of a Inconel 718 in its aged state with various coated carbide tools and c-BN tools. A specially designed open tribometer has been used to characterize friction coefficient, heat partition coefficient under extreme conditions corresponding to the ones occurring in cutting...
Development of high-precision products of difficult to process materials often requires use of unconventional techniques and manufacturing technologies. The studies are labor- and cost-consuming. Development of a database in which they are collected and available informations necessary for designers of machinery and process design engineers, process is a matter of considerable importance. This paper...
A research results of surface texture after finish turning operation with plunge feed of hardened 18CrMo4 steel with use of cubical boron nitride (CBN) inserts having Wiper geometry are presented in this paper. The research was conducted according to Taguchi methodology, especially for mating of the machined surface with radial shaft seals. Next, the surface after finish turning with plunge feed was...
The article presents the mathematical model of production control in the Just-in-time delivery system’s conditions for a planning fixed horizon. The aim of the control model is to determine the demand for means of production (materials, labour force) at the right moment of time. The stochastic model of appearing the fault products was taking into account. Minimization both the costs of manufacturing...
This paper presents investigations of a sequential machining process which incorporates CBN hard turning with cryogenic pre-cooling of the workpiece (CHT) and ball burnishing (BB). The main goal of this study was to select machining conditions enhancing the quality of parts machined by hard turning including the surface roughness Ra of about 0.2 μm, good bearing properties and reducing the white layer...
This paper presents a description and results of experimental studies of normal deformations occurring in foundation chocks made of steel and epoxy resin, used in the so-called rigid seatings (mountings) of heavy machines and devices on foundations. The studies carried out have shown that these kinds of seatings are not perfectly rigid. In both cases there are significant normal deformations which...
The objective of this study is the selection of cutting data (such as vc, f, ap) and tool materials (PCD, ceramic, CBN and carbide cutting tools) in order to improve the surface roughness in precision turning operation of parts made of pure titanium (GRADE 2). Machining parameters and tool materials are considered as input parameters. The surface roughness is selected as the process output measure...
The article presents the issue of designing portable machine tools in which module components are applied. Portable machine tools are mainly designed for machining of elements at the place of their final installation. Experience has shown that achieving high efficiency in the design of portable machine tools can only be reached through the use of mechatronic approach with the use of ready-made modular...
This article presents the state of knowledge on cutting forces during the milling of light alloys. Research results presented in the paper concern cutting forces and their amplitudes depending on the technological parameters (vc, fz, ap) with the use of two carbide milling cutters having a different cutting edge geometry (γ=5º and γ=30º). Research and analysis of cutting forces appear to be a significant...
In this research, the suitability of almond shell and coconut fiber as a renewable agricultural residue for manufacturing of biocomposite to be used as a replacement of wood was investigated. The use of agriculture waste as a reinforcement in composite may result in several environmental and socioeconomic benefits. Biocomposite containing different weight percentage of almond shell particle (10, 20,...
This paper concerns in general the problem of the so-called rigid seatings of heavy machines and devices on foundations, by using foundation chocks traditionally made of steel, and now being more frequently replaced by foundation chocks cast of polymer materials specially developed for this purpose. It is a continuation and development of this problem tackled in Part I. In that part, the technical...
The influence of cutting technologies on the quality, mechanical properties and microstructure of the cut edges of steel is presented. The cutting technologies cover: plasma, laser beam, water jet and oxyfuel flame cutting. During investigation the measurements of perpendicularity tolerance, hardness, mean high of the profile Rz5 and metallographic examination were carry out. The results revealed...
Selective Laser Melting technique is one of the additive manufacturing methods. The paper presents the summary of technological problems and restrictions resulting in the production of lightweight lattice structures by this technique. All the cases applies to the device SLM Realizer II 250 running the software Controler for Realizer SLM/STL.
Variations of a flow stress vs. true strain illustrate behavior of material during plastic deformation. Stress-strain relationship is generally evaluated by a torsion, compression and tensile tests. Results of these tests provide crucial information pertaining to the stress values which are necessary to run deformation process at specified deformation parameters. Uniaxial compression tests at the...
In this paper, friction in longitudinal turning operations when using chamfered uncoated ceramic tools is investigated. Both tool-chip and workpiece - tool interactions are integrated in the friction model. The values of three force components were consequently measured during tool wear tests at different cutting speeds they were used as input data for computing the friction and normal forces acting...
The paper deals with the analysis of limited mechanisms construction designs exemplifying modern restricted couplings of world leading manufacturers. The description of limited mechanism structure as a technical system is given on the base of functional approach. The possibility of limited mechanisms separation into individual modules on the functional principle is proved. Main internal and external...
It is show, in the paper, that the components of friction force in the tool wear land are increased by the increase of the value of the conditions treatment (the velocity of translation machine table, the cross-feed, depth of the tension) by friction hardening of steel. The components of friction force are compared for two kinds of tools: disc-tool with smooth surface and disc-tool with transverse...
This paper deals with hard turning using conventional and wiper polycrystalline cubic boron nitride (PCBN) tools. 3D surface topographies and bearing area curves were determined and compared after hard turning with differently shaped cutting tools. Machined parts were made of a 100Cr6 (AISI 5210) hardened bearing steel with Rockwell hardness HRC=60 ± 1 HRC.
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