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  • Author: Jozef Pilc x
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Influence of the Cutting Speed and Feed Rate on Torque, Feed Force, Roughness and Shape of the Chips During Deep Hole Drilling

Abstract

This article describes methodology and realization of the deep hole drilling test. Goal of this trial is to define influence of the cutting speed and feed rate on torque and feed force. As well as during the test here was a focus on roughness and shape of the chips. A gun drill was used for deep hole drilling and we used etalon material, were here is possible to define cutting forces without any further testing of different steel grades. Also there is a description of CNC program, which was used for above mentioned testing and it can be utilized during other different trials.

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

Abstract

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

Open access
Study of the Wear of the Cutting Edge of Milling Heads

Abstract

The article deals with analysis of the charakter of the interaction of milling tools with cutting edges of the primary contact with the working materials. Based on the monitoring of wear is observed various charakter and intensity of wear of the cutting wedge, which is dependent on the position of the milling tool frame to the workpiece. Given the issue is analyzed in the state, according to the proposed method is the primary interaction of tool and workpiece milling tool, in order to increase tool life.

Open access
Milling Of Shaped Grooves – Profile Of Form Tools

Abstract

This paper deals with design of milling tool for milling of shaped groove. Actual industry production requires the large amount of tools and notably the special tools used for example when shaped milling. The requirements on the quality of tools are increasingly demanding. The quality of tools is given by construction, production process, selected material and also heat treatment. Shaped milling requires special tools made for given shape. Main request on the construction of tool is making of shape of cutting edge, which can produce the required shape of workpiece.

Open access
Determining the Shape Factor for Bend Torque

Abstract

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.

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

Abstract

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.

Open access
Identification of Tool Wear when Machining of Austenitic Steels and Titatium by Miniature Machining

Abstract

Application of miniature machining is currently rapidly increasing mainly in biomedical industry and machining of hard-to-machine materials. Machinability of materials with increased level of toughness depends on factors that are important in the final state of surface integrity. Because of this, it is necessary to achieve high precision (varying in microns) in miniature machining. If we want to guarantee machining high precision, it is necessary to analyse tool wear intensity in direct interaction with given machined 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. This article deal with experimental monitoring of tool wear intensity during miniature machining.

Open access
Austempered Ductile Iron Machining

Abstract

This article deals with the machining of cast iron. In industrial practice, Austempered Ductile Iron began to be used relatively recently. ADI is ductile iron that has gone through austempering to get improved properties, among which we can include strength, wear resistance or noise damping. This specific material is defined also by other properties, such as high elasticity, ductility and endurance against tenigue, which are the properties, that considerably make the tooling characteristic worse.

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

Abstract

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.

Open access
Skiving as Substitution of Tooth Grinding

Abstract

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.

Open access