Residual stress detection and evaluation has been of crucial importance, and also problematic for... more Residual stress detection and evaluation has been of crucial importance, and also problematic for many years. There are many methods of residual stresses determination based on destructive and non-destructive way of approach. Nowadays there are still undiscovered possibilities to determine these internal stresses. Opportunity to detect residual stress on line directly, without using big and expensive devices is motivation for presented work. Presented article is focused on possibility to determine the residual stresses induced in conductive materials using eddy currents phasor angle. Using eddy currents method gives opportunity for quick on line measurement of residual stresses. Induced stress causes in base material slight deviation in permeability and conductivity, which can be detected using standard eddy currents flaw detector. Experimental procedure included annealing for stress relief, manufacturing by face milling and measurement of residual stresses using x-ray diffraction a...
The use of forging tools in mass production has led to an enormous increase in the consumption of... more The use of forging tools in mass production has led to an enormous increase in the consumption of forging tools and the need for rapid and flexible tool renovations. A major lack in the renovations is to identify cracks propagating from the surface towards the core of the basic components. This article deals with the application of nondestructive detection technology when considering the size of die forging defects that arise in the process of forming.
Current demands on quality are the engine of searching for new progressive materials which should... more Current demands on quality are the engine of searching for new progressive materials which should ensure enough durability in real conditions. Due to their mechanical properties, however, they cannot be applied to conventional machining methods. In respect to productivity, one of the methods is the finding of such machining technologies which allow achieving an acceptable lifetime of cutting tools with an acceptable quality of a machined surface. One of the mentioned technologies is trochoidal milling. Based on our previous research, where the effect of changing cutting conditions (cutting speed, feed per tooth, depth of cut) on tool lifetime was analysed, next, we continued with research on the influences of trochoid parameters on total machining force (step and engagement angle) as parameters adjustable in the CAM (computer-aided machining) system. The main contribution of this research was to create a mathematical-statistical model for the prediction of cutting force. This model ...
Verification of product and quality control is an integral part of current production process. In... more Verification of product and quality control is an integral part of current production process. In terms of functional requirements and product interoperability, it is necessary to analyze their dimensional and also geometric specifications. Threaded holes are verified elements too, which are a substantial part of detachable screw connections and have a broad presence in engineering products. This paper deals with on the analysing of measurement strategies of verification geometric deviation of the position of the threaded holes, which are the indirect method of measuring threaded pins when applying different measurement strategies which can affect the result of the verification of the product..
Since most of the implant surface is in direct contact with bone tissue, shape and integrity of s... more 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. Among other characteristics that predetermine titanium of different grades of pureness as ideal biomaterial, titanium shows high mechanical strength making precise miniature machining increasingly difficult. Current titanium-based implants are often anodized due to colour coding. This anodized layer has important functional properties for right usage and also bio-compatibility of dental implants. Physical method of anodizing and usage of anodizing mediums has a significant influence on the surface quality and itself functionality. However, basic requirement of the dental implant with satisfactory properties is quality of machined surface before anodizing. Roughness, for example, is factor affecting of time length of anodizing operation and so whole productivity. The paper is focused on monitoring of surface and area characte...
The article is about auxiliary equipment into service, specifically, it is control device which i... more The article is about auxiliary equipment into service, specifically, it is control device which is to be designed to check the components for synchronization speed between gears in cars. In the introduction of article is described substance and necessary these equipment into in enterprises, their technical and economic importance. The core of the article readers will know firstly with a component for which is a device design. The most important on a component will be a measured parameters. Next in the core of the article, is described and illustrated design of the device with a brief functional description and control procedure. Of course that in the article is drafted verification of device capability with using the statistical method, where is the functionality of the device is expressed using indexes Cgm a Cgmk . Benefits, asset and evaluation of work for the application area are listed at the end of this article.
Residual stress detection and evaluation has been of crucial importance, and also problematic for... more Residual stress detection and evaluation has been of crucial importance, and also problematic for many years. There are many methods of residual stresses determination based on destructive and non-destructive way of approach. Nowadays there are still undiscovered possibilities to determine these internal stresses. Opportunity to detect residual stress on line directly, without using big and expensive devices is motivation for presented work. Presented article is focused on possibility to determine the residual stresses induced in conductive materials using eddy currents phasor angle. Using eddy currents method gives opportunity for quick on line measurement of residual stresses. Induced stress causes in base material slight deviation in permeability and conductivity, which can be detected using standard eddy currents flaw detector. Experimental procedure included annealing for stress relief, manufacturing by face milling and measurement of residual stresses using x-ray diffraction a...
The use of forging tools in mass production has led to an enormous increase in the consumption of... more The use of forging tools in mass production has led to an enormous increase in the consumption of forging tools and the need for rapid and flexible tool renovations. A major lack in the renovations is to identify cracks propagating from the surface towards the core of the basic components. This article deals with the application of nondestructive detection technology when considering the size of die forging defects that arise in the process of forming.
Current demands on quality are the engine of searching for new progressive materials which should... more Current demands on quality are the engine of searching for new progressive materials which should ensure enough durability in real conditions. Due to their mechanical properties, however, they cannot be applied to conventional machining methods. In respect to productivity, one of the methods is the finding of such machining technologies which allow achieving an acceptable lifetime of cutting tools with an acceptable quality of a machined surface. One of the mentioned technologies is trochoidal milling. Based on our previous research, where the effect of changing cutting conditions (cutting speed, feed per tooth, depth of cut) on tool lifetime was analysed, next, we continued with research on the influences of trochoid parameters on total machining force (step and engagement angle) as parameters adjustable in the CAM (computer-aided machining) system. The main contribution of this research was to create a mathematical-statistical model for the prediction of cutting force. This model ...
Verification of product and quality control is an integral part of current production process. In... more Verification of product and quality control is an integral part of current production process. In terms of functional requirements and product interoperability, it is necessary to analyze their dimensional and also geometric specifications. Threaded holes are verified elements too, which are a substantial part of detachable screw connections and have a broad presence in engineering products. This paper deals with on the analysing of measurement strategies of verification geometric deviation of the position of the threaded holes, which are the indirect method of measuring threaded pins when applying different measurement strategies which can affect the result of the verification of the product..
Since most of the implant surface is in direct contact with bone tissue, shape and integrity of s... more 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. Among other characteristics that predetermine titanium of different grades of pureness as ideal biomaterial, titanium shows high mechanical strength making precise miniature machining increasingly difficult. Current titanium-based implants are often anodized due to colour coding. This anodized layer has important functional properties for right usage and also bio-compatibility of dental implants. Physical method of anodizing and usage of anodizing mediums has a significant influence on the surface quality and itself functionality. However, basic requirement of the dental implant with satisfactory properties is quality of machined surface before anodizing. Roughness, for example, is factor affecting of time length of anodizing operation and so whole productivity. The paper is focused on monitoring of surface and area characte...
The article is about auxiliary equipment into service, specifically, it is control device which i... more The article is about auxiliary equipment into service, specifically, it is control device which is to be designed to check the components for synchronization speed between gears in cars. In the introduction of article is described substance and necessary these equipment into in enterprises, their technical and economic importance. The core of the article readers will know firstly with a component for which is a device design. The most important on a component will be a measured parameters. Next in the core of the article, is described and illustrated design of the device with a brief functional description and control procedure. Of course that in the article is drafted verification of device capability with using the statistical method, where is the functionality of the device is expressed using indexes Cgm a Cgmk . Benefits, asset and evaluation of work for the application area are listed at the end of this article.
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