Jozef Pilc’s research while affiliated with University of Žilina and other places

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Publications (26)


Selected experimental parameters
Evaluation of Surface Roughness after Actively Rotary Turning Method
  • Article
  • Full-text available

May 2020

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83 Reads

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2 Citations

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Jozef Pilc

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Increased emphasis on productivity and machining quality is the cause of constantly looking for progressive chip machining technologies to meet this requirement. One of this option is the use of specific turning with an actively driven tool. This unconventional turning method makes it possible to select higher feed values while keep the required tool life. However, it is important to identify the properties and all possible applications of such an actively driven tool during the machining process. The paper focuses on the resulting state of the machined surface of the workpiece in terms of surface roughness parameters due to the feed values. For the sake of clarity, the knowledge and findings of active rotation machining are compared to self-propelled rotary turning.

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Identification of tool wear when drilling process of bearings steels C56E2 with microstructure of lamellar pearlite

January 2019

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253 Reads

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6 Citations

Transportation Research Procedia

Application of drilling process is currently rapidly increasing mainly in bearings industry and machining of hardly-to-machine materials. Therefore, the drilling tool is subject to various requirements in terms of quality of making holes, production efficiency and economic indicators. If we want to optimize these aspects of production, it is necessary to analyse tool wear intensity in direct interaction with given machined materials. During cutting process, different cutting wedge deformations occur, leading in most cases to a rapid wear and destruction of the cutting wedge. This article deal with monitoring of exchangeable-tip drill wear intensity during drilling of bearing steel C56E2.


Fig. 4. Used tools: a) standard tool, b) tool with face chip breaker c) tool with flank chip breaker
Fig. 5. Shape of chips after machining: a) standard tool b) tool with face chip breaker c) tool with flank chip breaker
Fig. 6. Visual surface quality a) tool with face chip breaker b) tool with flank chip breaker
Cutting conditions in experiments
Analysis of surface roughness in turning process using rotating tool with chip breaker for specific shapes of automotive transmission shafts

January 2019

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58 Reads

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8 Citations

Transportation Research Procedia

Increasing machining productivity is the cause of constantly looking for new machining methods and methods to ensure the required quality. One of these methods is machining with rotary tool, which combines conventional cutting materials with an unconventional machining scheme. These properties allow to improve cutting conditions and thus increase productivity with preserved quality. In this paper, there is made the identification of properties and possibilities of using the rotating tool during turning. The main focus is the analysis and evaluation of technological parameters and surface quality, especially surface roughness.


Studying of cutting conditions when hard turning and their impact on integrity of shaped-complex surfaces

March 2018

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176 Reads

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1 Citation

MATEC Web of Conferences

This article deals with impact of cutting conditions when hard turning of shaped-complex surfaces which are concentration origin of cracks especially in the area of notches. These areas significantly reduce the lifetime and functionality of surface by degradation of surface integrity where are the significant number of destruction cracks. Actual experiments are focused on detection of impact of each individual cutting condition on the generation of residual stress and its impact in each surface and subsurface layer of material. Results and evaluations explain what way is necessary to design and apply cutting conditions when hard turning of shaped-complex surfaces.


Table 1 Chemical properties TiGr5 (ASTM F67)
Table 2 . Factors and levels used in the experiment
Table 3 . Achievement attributes from experiments Tc
Identification of Tool Wear Intensity During Miniature Machining of Austenitic Steels and Titanium

December 2017

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376 Reads

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7 Citations

Procedia Engineering

Implementation and contribution of miniature machining is currently rapidly increasing in biomedical industry, machining of austenitic steels and titanium particularly. Machinability of materials with increased level of toughness depends on factors that are important in the final state of surface integrity. There are requirements for high precision in miniature machining with measures varying in microns. If we want to guarantee machining precision, it is necessarry to identify tool wear intensity in interaction with given materials. During long-term cutting process, different cutting wedge deformations occur, leading in most cases to a rapid wear and destruction of the cutting wedge. The article deald with experimental monitoring of tool wear intensity during miniature machining.


Identification of Surface Characteristics Created by Miniature Machining of Dental Implants Made of Titanium Based Materials

December 2017

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906 Reads

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15 Citations

Procedia Engineering

One of the most important characteristic of dental implant made of biomaterials is ability to create correct interaction between implant and bone tissue. Since most of the implant surface is in direct contact with bone tissue, shape and integrity of said surface has great influence on successful osseointegration. The most implemented material in manufacturing of dental implants is titanium of different grades of pureness. Among other characteristics that predetermine titanium as ideal biomaterial, titanium shows high mechanical strength making precise miniature machining increasingly difficult. The article deals with resulting quality, integrity and characteristics of dental implants surface after machining.


Figure 1. Co-axial turn-milling operation 2 RESIDUAL STRESS 
Table 2 . 
Identification of Residual Stress in the Production of Molding Tools by Turn-Milling Technology

October 2017

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67 Reads

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2 Citations

Technological Engineering

This article describes how to plan the tool path and analyze the surface of the machined part by working simultaneously on two basic operations such as milling and turning. New machine tools allow parallel processing of both multi-axis tools at the same time, it is a production technology in which the workpiece and the tool are simultaneously rotating. This relatively new turnmilling technology could be an alternative to increasing productivity in many applications. Especially in cases involving heavy-duty materials or large diameters of machined surface. The aim of this study is to explore this new technology, especially with regard to the increased precision and quality of the surface of the workpiece. Experimental results show that the combination of these two operations is suitable for precise machining of rotationally symmetrical workpieces with high surface finish.


Figure 1. Diagram of stress concetration factor for bend moment [1] 
Figure 2. Diagram of stress concetration factor for torque moment [1] 
Figure 3. Diagram of samples Using figure 3 an empirical formula for calculating the concentration of bending at the critical point shaft fitted, 
Figure 4. Determination of concentration factor α for D/d=1.07 
Determining the Shape Factor for Bend Torque

October 2017

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161 Reads

Technological Engineering

This article is focused on creating diagrams to determine the shape factor α. Its significance for the use of the design components. And the experimental determination curves diagrams comparing the previously used charts and monograms. The beginning of the development of appropriate calculation methods for determining courses of stress concentration factor for individual notches, with the previously used charts.


Influence of Fine Motor Skill on Accuracy of Measurements Using a Handheld Sliding Caliper at Adolescents Group Aged 19-20

October 2017

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161 Reads

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5 Citations

Technological Engineering

This innovate ve interdisciplinary study deals with influence of fine motor skill level (finger dexterity) of individual on his measurement results in metrology practice. The main objective of this study was determinate fine motor skill level of individuals using a motor test. Further determinate the potential effect of different fine motor skill levels on accuracy of measuring using a mechanical handheld sliding caliper. Fine motor skill test and metrological test were implemented. Pursuant the results of fine motor skill test were probands divided into 2 groups. The groups are significantly different on accuracy of measurement (p=0,006). Pearson coefficient shows a significant correlation r = - 0.66 between the Purdue Pegboard test and a measurement error. Results confirmed that the fine motor skill of the upper limbs (especially finger coordination) significantly influence accuracy of measurement using a mechanical handheld sliding caliper.


Figure 1. Shape of tools. a-for soft hobbing, b-for skiving (finishing). 
Figure 2. Angle of incline of face surface. a-zero or positive λP, b-negative λP. 
Table 3 . 
Skiving as Substitution of Tooth Grinding

October 2017

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748 Reads

Technological Engineering

Skiving is a relatively new technology that can partially replace a lead of tooth grinding. This article aims to introduce the results of skiving in a particular production. In the first parts of the article authors focused on the technology of skiving and its patterns. In the following part they introduce results of tooling. The last part of the article describes appreciation, advantages and disadvantages of the technology.


Citations (19)


... On the other hand, tools with forced rotation have rotary motion provided from an external drive. The latter does not have to be part of the machine tool, especially in the case of conventional machine tools [7]. If the technology is used for CNC (Computer Numeric Control) machines, the CNC machine can provide the tool drive. ...

Reference:

Experimental Study and Verification of New Monolithic Rotary Cutting Tool for an Active Driven Rotation Machining
Evaluation of Surface Roughness after Actively Rotary Turning Method

... Fernández-Pérez et al. [23] investigated on minimizing the position errors and tool wear after the drilling of composite fiber reinforced polymer material. Mikloš et al. [24] studied on the assignation of tool wear in the course of the drilling process of C56E2 bearing steels. The axial wear of the tool electrode is approximately proportional to the number of holes machined. ...

Identification of tool wear when drilling process of bearings steels C56E2 with microstructure of lamellar pearlite

Transportation Research Procedia

... Therefore, it is necessary to perform the accelerated corrosion test on prestressing steel bars at different levels of applied tensile stress. Since the corrosion rate of steel in atmospheric corrosion conditions is relatively slow [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], it is difficult to achieve the expected degree of corrosion in a short period of time. Therefore, electrochemical corrosion was used in the presented experimental measurements [32][33][34][35], which achieved a significant degree of corrosion in a relatively short time by analyzing the effect of corrosion on prestressing steel bars. ...

Analysis of surface roughness in turning process using rotating tool with chip breaker for specific shapes of automotive transmission shafts

Transportation Research Procedia

... Tang et al. [13] carried out the 2 of 16 finishing operation of AISI D2 hardened steel by using the DHT process, and the experimental results showed that the minimum surface roughness Ra is 0.34 µm when the tool corner radius is 0.8 mm, which can achieve the surface finish of the grinding process. Holubjak et al. [14] found that when the cutting speed of DHT high carbon steel is 100 m/min, the axial surface residual stress is up to −850 MPa. Kundrak et al. [15] compared DHT and grinding processes and found that the surface roughness obtained by the two processes was not much different, and the former had advantages in some surface integrity characteristics. ...

Studying of cutting conditions when hard turning and their impact on integrity of shaped-complex surfaces

MATEC Web of Conferences

... In the lack of information on the number of samples tested, it can be concluded that the tests were carried out on a single sample, which affects the reliability of the results obtained and is undoubtedly an inappropriate action [9,11]. The results of testing for a small number of samples in determining the type A standard uncertainty and for the expanded uncertainty are crucial and affect the final results [12]. The most common instruments for measuring geometric quantities such as shaft diameters are hand-held measuring instruments such as calipers and bore gages. ...

Influence of Fine Motor Skill on Accuracy of Measurements Using a Handheld Sliding Caliper at Adolescents Group Aged 19-20

Technological Engineering

... It is a nondestructive testing method and has considerable importance in improving quality and reliability in industry, especially in engineering. It is one of the most important methods of nondestructive testing of materials and can detect material discontinuities resulting from the production process well as from mechanical stress during operation [5,8]. ...

Identification of Residual Stress in the Production of Molding Tools by Turn-Milling Technology

Technological Engineering

... Pimenov et al. adequately assessed and designed mathematical models of elastic displacements of the technological system under face milling processes (workpiece material, cutting speed, cutting depth, the main cutting-edge angle, the cutter overhang to its diameter ratio, feed per tooth) for different values of tool flank wear on the flank surface. They used GF2171S5 milling machine's compliances of the Angular compliances of the spindle assembly technological system [67]. ...

Identification of Tool Wear Intensity During Miniature Machining of Austenitic Steels and Titanium

Procedia Engineering

... A large number of surface treatment processes are available to alter surface topography of Ti implants. In this study, we used industrial machining (milling) for creating different range of roughness [32]. Implant dentistry has for many years focused on studying the bone-implant interface, looking for the most suitable contact to prevent the development and progression of periimplant disease [33]. ...

Identification of Surface Characteristics Created by Miniature Machining of Dental Implants Made of Titanium Based Materials

Procedia Engineering

... The record is made and in case the burning takes place in selected samples, no further production is allowed. Maintenance is informed immediately and the machine by which the samples were produced is stopped until measures are taken to remove a burning from the orbital path surface [13,15,3]. ...

Results if Machining by Tool of Self-Propelled Rotation Due to Wear
  • Citing Article
  • February 2017

MANUFACTURING TECHNOLOGY

... Surface treatment improves the direct contact between human bone and implant, which results in better osseointegration. Implant surface plays a vital role in the success of implantation; hence, the control of surface characteristics during manufacturing needs research attention [11,12]. Biocompatibility test with Ti-6Al-7Nb alloy in the presence and absence of hydroxyapatite coating reveals that Ti-6Al-7Nb alloy provides proper integration with tissues even without coating [13]. ...

Non-Destructive Analysis of Basic Surface Characteristics of Titanium Dental Implants Made by Miniature Machining

Technological Engineering