Lenka Čepová

A new method for the prediction of laser cut surface topography

Abstract The submitted contribution focuses on the clarification of a laser beam cutting technology especially from the point of view of created surface topography. It provides a new view on a deformation process caused by laser beam action and on possibilities of using the surface topography. The measurement and characterisation of surface topography was performed in depth traces using a contact profilometer Surftest SJ 401 and by and an optical-contact profilometer Talysurf CLI 2000 (measured from the top edge of the sample). Thanks to this procedure, it was possible to observe and to measure a development of the numerical values of the surface (profile) roughness parameter Ra. Based on the measurement of the surface topography, there were analyzed and interpreted data with a purpose to theoretically describe surface topography and to develop an analytical solution for the profile topographical function. By using the profile topographical function, it is possible to solve the practical problems the most engineers and users face in laser beam cutting technology (LBC) process, as well as to maximize LBC manufacturing system performance and to determine the values of the process parameters that will reach the desired product quality.

Measurement of Surface Topography Using Computed Tomography

Computed tomography is a new field of coordinate measuring metrology. For this reason, many areas of its application are not yet completely known. The paper presents reproduction possibilities of geometrical structure of a surface by computer tomography. Results are combined with data from a classical tactile profilometer to measure surface topography. Comparison of the obtained values makes it possible to confirm the usefulness of computer tomography to reconstruct the surface geometry. This is especially important when indoor surfaces are indispensable. Such measurement with any other device than computer tomograph is not possible or requires damage of the element being measured. As a result of the measurement by means of a computer tomograph, from the same measurement data we obtain not only information about the surface and shape of the element, but also—as an additional advantage—ability to evaluate internal structure of material, for example its porosity or fibre distribution in case of composites.

Measurement System Analyses – Gauge Repeatability and Reproducibility Methods

Abstract The submitted article focuses on a detailed explanation of the average and range method (Automotive Industry Action Group, Measurement System Analysis approach) and of the honest Gauge Repeatability and Reproducibility method (Evaluating the Measurement Process approach). The measured data (thickness of plastic parts) were evaluated by both methods and their results were compared on the basis of numerical evaluation. Both methods were additionally compared and their advantages and disadvantages were discussed. One difference between both methods is the calculation of variation components. The AIAG method calculates the variation components based on standard deviation (then a sum of variation components does not give 100 %) and the honest GRR study calculates the variation components based on variance, where the sum of all variation components (part to part variation, EV & AV) gives the total variation of 100 %. Acceptance of both methods among the professional society, future use, and acceptance by manufacturing industry were also discussed. Nowadays, the AIAG is the leading method in the industry.

The Influence of the Size Styles for the Touching Probe for the Roundness of the Deviation

Abstract The article deals with the influence of the sensing touch on the deviation of circularity on the WENZEL LH 65 X3M on 3D machining and using the Metrosoft QUARTIZ R6 software at the VŠB-TU Ostrava Laboratory, Faculty of Mechanical Engineering, Department of Machining, Assembly and engineering metrology. The aim was to analyze the influence of individual sensors on the different lengths of the pin and the diameter of the sensing metod on the accuracy of the measurement of the variance of the circularity.

Experimental Choice of Suitable Cutting Tool for Machining of Plastic

Abstract In todays competitive times overall development of the technology is moving somewhere further, including automotive industry, which went toward relieving material. One of the many materials which are applied in the automotive industry, are polymers. The aim of the article was to test three different types of cutters for machining material group N - nonferrous metals. The article was tested three different types of cutters from different vendors on electro material SKLOTEXTIT G 11 and samples size 12x100x500mm. The entire experiment was conducted in a company Slavík- Technické plasty on the machine tool SCM RECORD 220. In the conclusion are technical-evaluation, experimental results and conclusions for company.

Measurement of Deviation of Roundnes

Abstract For the measurement of roundness deviations are used different measuring methods and measuring Instruments from universal to high-precision measuring Instruments. Recently, optical measurement Instruments have irreplaceable role and get to the forefront due simpler process of measurement, accelerate measuring and large possibility to storage obtained data. Nowadays more and more successful optical measurements above touch measurement, but touch measurement still has an important role in companies. Therefore, in the experiment were measured the deviations of the roundness on devices measuring by touch method, and by the optical devices. The values of these measurements allowed their comparison and stastical evaluation.

Tool Life Reliability of Indexable Cutting Inserts

Abstract This paper presents experimental testing of the cutting ability for indexable cutting inserts. The main goal will be to select a suitable test for determine the cutting abilities of cutting inserts. Nowadays all manufacturers want to achieve lower cutting forces so can permit higher speeds and feeds, without increasing the risk of chipping. For evaluating we had to design such testing procedure that it would be possible to compare and evaluate the cutting ability of the selected cutting inserts used for tests. In today’s competitive global market, quality and precision is the most important parameter. Tight tolerances and urgent deadlines are normal. In the machine tool business, companies must keep their cutting edge, or your company will lose its competitive edge.

Hard Machinable Machining of Cobalt Super Alloys

Abstract The article deals with difficult-to-machine cobalt super alloys. The main aim is to test the basic properties of cobalt super alloys and propose suitable cutting materials and machining parameters under the designation 188 when machining. Although the development of technology in chipless machining such as moulding, precision casting and other manufacturing methods continues to advance, machining is still the leading choice for piece production, typical for energy and chemical engineering. Nowadays, super alloys are commonly used in turbine engines in regions that are subject to high temperatures, which require high strength, high temperature resistance, phase stability, as well as corrosion or oxidation resistance.