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Karl Kuzman

Bio: Karl Kuzman is an academic researcher from University of Ljubljana. The author has contributed to research in topics: Forming processes & Deep drawing. The author has an hindex of 17, co-authored 49 publications receiving 1305 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a systematic review on size effects in manufacturing of metallic components is presented, where the typology of size effects is explained, followed by a description of size effect on strength and tribology, and last three sections describe size effects on formability, forming processes and cutting processes.

381 citations

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TL;DR: In this article, the authors define a new class of sheet-bulk metal forming processes, give an overview of the existing processes belonging to this class, highlight the tooling aspects as well as the resulting product properties and present a short summary of the relevant work that has been done towards modeling and simulation.

314 citations

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TL;DR: In this article, the results of the numerical simulations were compared to the samples from the production processes. And the reliability of the results, costs, benefits, and times required for performing numerical simulations are evaluated.

86 citations

Journal ArticleDOI
TL;DR: In this article, a high-speed Water Jet (WJ) was used as a tool for die-less Incremental Sheet Metal Forming (ISMF) and the relative jet diameter was defined as the ratio between the WJ diameter and the blank thickness.
Abstract: This exploratory paper aims to introduce a high-speed Water Jet (WJ) as a tool for die-less Incremental Sheet Metal Forming (ISMF). First experiments indicate that in the case of Water Jet Incremental Sheet Metal Forming (WJISMF) the forming time, energy efficiency and forming accuracy are rather poor compared to ISMF with a rigid tool. However, the proposed technology brings higher process flexibility and better tools to workpiece interface conditions. For a better process characterization, the relative jet diameter is introduced, which is defined as the ratio between the WJ diameter and the blank thickness. Relevant process parameters are identified and technological windows are phenomenological defined, shoving that WJISMF can be applied as a complementary solution to ISMF with a rigid tool.

56 citations

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TL;DR: In this paper, a combination of experiments and numerical evaluations was used to evaluate the impacts of different process parameters on the geometrical accuracy of cold-formed components, and an interesting phenomenon concerning the accuracy control was presented: it is possible to find such a combination where the process is stable, and not so sensitive to the fluctuations of parameters.

38 citations


Cited by
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Journal ArticleDOI
TL;DR: A three-year study by the CIRP's Collaborative Working Group on Surface Integrity and Functional Performance of Components as discussed by the authors reported recent progress in experimental and theoretical investigations on surface integrity in material removal processes.

769 citations

Journal ArticleDOI
TL;DR: In this article, the state-of-the-art in predictive performance models for machining operations is presented, and a critical assessment of the relevant modelling techniques and their applicability and/or limitations for the prediction of the complex machining operation performed in industry.

622 citations

Journal ArticleDOI
TL;DR: In this paper, a simple theoretical analysis of the cylindrical compression test has been developed so that the constant friction factor can be estimated quantitatively by using cold/hot compression test.

387 citations

Journal ArticleDOI
TL;DR: In this article, the authors define a new class of sheet-bulk metal forming processes, give an overview of the existing processes belonging to this class, highlight the tooling aspects as well as the resulting product properties and present a short summary of the relevant work that has been done towards modeling and simulation.

314 citations

Journal ArticleDOI
TL;DR: In this paper, the authors give an overview of these efforts substituting environmentally hazardous lubricants in cold, warm and hot forging as well as sheet forming and punching/blanking by new, less harmful lubricants and furthermore describe other measures directed towards the same goal such as development of anti-seizure tool materials and coatings and application of structured workpiece and tool surfaces.

270 citations