Micro Pattern Making Method on AlN-hBN Composites Using Powder Blasting Process

2008 ◽  
Vol 368-372 ◽  
pp. 943-946
Author(s):  
Si Young Beck ◽  
Jung Won Lee ◽  
Myeong Woo Cho ◽  
Dong Sam Park ◽  
Ho Su Jang ◽  
...  
Keyword(s):  
Material Properties ◽  
Brittle Materials ◽  
Experimental Results ◽  
Micro Machining ◽  
Powder Blasting ◽  
Micro Pattern ◽  
Hard And Brittle Materials ◽  
Micro Patterns

In this study, micro patterns were formed on the developed AlN-hBN composites using powder blasting techniques, which have been considered as one of the most appropriate micro machining methods for hard and brittle materials such as ceramics. To achieve the objective, first, material properties of the developed AlN-hBN composites were evaluated according to the variation of h-BN contents. And, a series of required experiments were performed, and the results were analyzed. As the results, it was investigated that the machiniability of the developed AlN-hBN composites increased with the increase of the h-BN contents in the composites. From the experimental results, it was possible to determine optimum blasting conditions for micro pattern making on the developed AlN-hBN composites.

Application of Powder Blasting Techniques to Micro-Pattern Making Process for Si3N4-hBN Composites

2005 ◽  
Vol 287 ◽  
pp. 51-56 ◽  
Author(s):  
Myeong Woo Cho ◽  
Won Seung Cho ◽  
Dong Sam Park ◽  
Jae Hyung Lee ◽  
Eun Sang Lee ◽  
...  
Keyword(s):  
Material Properties ◽  
Experimental Results ◽  
Powder Blasting ◽  
Micro Pattern ◽  
Experimental Works

In this study, micro powder blasting techniques are applied to micro-pattern making process using developed Si3N4-hBN composites. Material properties of the developed machinable ceramics according to the variation of h-BN contents, those are used to give good machinability to the ceramics, are evaluated. And, a series of required experimental works are performed to determine optimum powder blasting conditions for micro-pattern making. The experiments are performed for the prepared samples with no mask, and samples with three different mask patterns. As the results, it can be observed that the machinability of the developed Si3N4-hBN composites increases as the h-BN contents in the composites. Also, from the experimental results, it is possible to determine the optimum blasting conditions for micro-pattern making process with Si3N4-hBN composites.

Electroless Plating of Micro Pencil Grinding Tools with 5-10 μm Sized cBN Grits

2016 ◽  
Vol 1140 ◽  
pp. 133-140 ◽  
Author(s):  
Peter Arrabiyeh ◽  
Vandeet Raval ◽  
Benjamin Kirsch ◽  
Martin Bohley ◽  
Jan Christian Aurich
Keyword(s):  
Electroless Plating ◽  
Cutting Forces ◽  
Brittle Materials ◽  
Small Scale ◽  
Experimental Setup ◽  
Micro Machining ◽  
High Quality ◽  
Hard And Brittle Materials ◽  
Scale Structures ◽  
Small Scale Structures

Micro grinding is a promising process to produce small scale structures in hard and brittle materials. Just like macro grinding processes, a high number of abrasive grits embedded on the grinding tools, are applied. This high number of grits results in low cutting forces on individuall grits and very small chip thicknesses, thus generating surfaces with a high quality. The manufacturing of the tools needed to produce such small structures is very challenging. In this paper, a method for the coating of micro pencil grinding tools (MPGTs) is proposed. MPGTs utilize coated superabrasive grits for micro machining hard and hardened materials. The MPGTs developed in the research presented here consist of a base body made of cemented carbide, abrasive grits made of cBN and a nickel bond. The experimental setup and the coating parameters needed to produce a 50-55 μm MPGT with 5-10 μm cBN grits nominal diameter is outlined. In addition, the tools are validated by machining a 500 μm long groove on a hardened 16MnCr5 workpiece.

Micro Groove Forming on AlN/hBN Composites Using Powder Blasting Process

2006 ◽  
Vol 510-511 ◽  
pp. 1018-1021
Author(s):  
Won Seung Cho ◽  
Myeong Woo Cho ◽  
Dong Sam Park
Keyword(s):  
Material Properties ◽  
Experimental Results ◽  
Powder Blasting ◽  
Experimental Works

In this study, powder blasting techniques are applied for micro groove forming on the developed AlN/hBN composites. First, material properties of the composites are evaluated according to the variation of h-BN contents. And, a series of required experimental works are performed to determine optimum powder blasting conditions for micro groove forming. The experiments are performed for the prepared samples with masked patterns. As the results, it can be observed that the machiniability of the developed AlN/hBN composites increases as h-BN contents in the composites. Also, from the experimental results, it is possible to determine the optimum blasting conditions for micro groove forming on the developed AlN/hBN composites.

Study on the Ductile-Mode Milling of Brittle Ceramics

2012 ◽  
Vol 490-495 ◽  
pp. 3654-3657
Author(s):  
Xiang Cheng ◽  
Bin Gao ◽  
Jun Ying Liu ◽  
Xian Hai Yang
Keyword(s):  
Experimental Study ◽  
Brittle Materials ◽  
Ceramic Materials ◽  
High Accuracy ◽  
Experimental Results ◽  
Machining Parameters ◽  
Machining Conditions ◽  
Ductile Mode ◽  
Hard And Brittle Materials ◽  
Experimental Background

Hard and brittle materials such as silicon and ceramic materials are difficult to machining due to their brittle properties. By the ductile-mode machining, delicate features with high accuracy can be created on these materials by mechanical micro/nano machining. This paper introduced the experimental study on the ductile-mode milling of ceramics. First, the experimental background and plans have been introduced. Then, on the sub-micron milling center, experimental results show that ductile-mode machining can be achieved. Both machining parameters and machining conditions are very important in order to realize the ductile-mode machining

scholarly journals Influence of the Characteristics of a Workpiece on the Slicing Characteristics Including Tool Wear

2018 ◽  
Vol 221 ◽  
pp. 04005
Author(s):  
Satoshi Sakamoto ◽  
Masaya Gemma ◽  
Yasuo Kondo ◽  
Kenji Yamaguchi ◽  
Mitsugu Yamaguchi ◽  
...  
Keyword(s):  
Tool Wear ◽  
Material Properties ◽  
Brittle Materials ◽  
Thickness Variation ◽  
Workpiece Material ◽  
Tool Performance ◽  
Hard And Brittle Materials ◽  
The Wire

Multi-wire saws with a diamond electrodeposited wire tool are widely used to slice hard and brittle materials. The properties of the materials significantly affect the saw’s performance in terms of slicing quality, efficiency, and accuracy. In this study, the effects of the material properties of workpieces on wire tool performance and tool wear are described. The main conclusions are as follows: the higher the hardness and toughness of the workpiece material, the longer the slicing time and greater the damage to the wire tool. The brittleness of the workpiece adversely affects the thickness variation more than its hardness. In addition, the frequency of chipping mainly depends on the hardness of the workpiece, whereas the chipping size mainly depends on the toughness of the workpiece.

scholarly journals Influence of the Material Properties on Microgrooving u sing Wire Tools Electrodeposited with Diamond Grains

2021 ◽  
Vol 11 (1) ◽  
pp. 155-161
Author(s):  
Masaya Gemma ◽  
◽  
Jiayu Liu ◽  
Satoshi Sakamoto ◽  
◽  
...  
Keyword(s):  
Material Properties ◽  
Brittle Materials ◽  
Groove Depth ◽  
Metallic Materials ◽  
Machining Time ◽  
Hard Materials ◽  
Grinding Ratio ◽  
Work Material ◽  
Hard And Brittle Materials ◽  
The Wire

In this study, the main objective is to clarify the relationship between the material properties of the work material and the grooving properties for various work materials from hard and brittle materials to metallic materials. In this paper, in order to investigate the grinding characteristics of diamond electroplated wire tools, including the wear characteristics, we conducted grooving experiments with borosilicate glass (Pyrex), which is a kind of hard and brittle material, and aluminum alloy (A5052), and tough pitch copper (C1100), a kind of metallic material, using diamond electroplated wire tools in a work material rotation method. As a result of the grooving experiments, it was clarified that the grooving characteristics of the work materials were influenced by the hardness and brittle behavior of the materials. The groove depth is influenced by the hardness and brittleness behavior of the material. When machining hard materials, the groove depth increases slowly in the initial stage of machining due to the poor bite of the wire tool, but increases rapidly as the machining progresses. On the other hand, the groove width does not depend on the machining time or speed, but is influenced by the hardness of the material and the ease with which plastic deformation occurs. The wear of the wire tool is also influenced by the hardness and brittleness of the material. In the machining of hard materials, the wear caused by stray wire and vibration in the early stages of machining was significant. The grinding ratio calculated from the ratio of the groove depth to the amount of grinding has a very different trend for hard and brittle materials and metallic materials. In the machining of hard and brittle materials, the amount of machining increased rapidly as machining progressed, so the grinding ratio also increased, but in metallic materials, the amount of machining itself was small and the grinding ratio did not increase. For A5052, the grinding ratio tended to decrease as machining progressed. Future work In the future, it is necessary to clarify the machining conditions to reduce the wear caused by stray wire tools and vibration during the initial machining of hard materials.

Determination of Charge Coefficient of Piezoelectric Films Using a Combined Finite Element Model and Dynamic Loading Technique

2020 ◽  
Vol 835 ◽  
pp. 229-242
Author(s):  
Oboso P. Bernard ◽  
Nagih M. Shaalan ◽  
Mohab Hossam ◽  
Mohsen A. Hassan
Keyword(s):  
Finite Element ◽  
Dynamic Loading ◽  
Material Properties ◽  
Accurate Determination ◽  
Substrate Material ◽  
Experimental Results ◽  
Piezoelectric Composite ◽  
Piezoelectric Film ◽  
Piezoelectric Charge

Accurate determination of piezoelectric properties such as piezoelectric charge coefficients (d33) is an essential step in the design process of sensors and actuators using piezoelectric effect. In this study, a cost-effective and accurate method based on dynamic loading technique was proposed to determine the piezoelectric charge coefficient d33. Finite element analysis (FEA) model was developed in order to estimate d33 and validate the obtained values with experimental results. The experiment was conducted on a piezoelectric disc with a known d33 value. The effect of measuring boundary conditions, substrate material properties and specimen geometry on measured d33 value were conducted. The experimental results reveal that the determined d33 coefficient by this technique is accurate as it falls within the manufactures tolerance specifications of PZT-5A piezoelectric film d33. Further, obtained simulation results on fibre reinforced and particle reinforced piezoelectric composite were found to be similar to those that have been obtained using more advanced techniques. FE-results showed that the measured d33 coefficients depend on measuring boundary condition, piezoelectric film thickness, and substrate material properties. This method was proved to be suitable for determination of d33 coefficient effectively for piezoelectric samples of any arbitrary geometry without compromising on the accuracy of measured d33.

scholarly journals FEM and Analytical Modeling of the Incipient Chip Formation for the Generation of Micro-Features

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3789
Author(s):  
Michele Lanzetta ◽  
Marco Picchi Picchi Scardaoni ◽  
Armin Gharibi ◽  
Claudia Vivaldi
Keyword(s):  
Material Properties ◽  
Analytical Modeling ◽  
Cutting Tool ◽  
Sustainable Manufacturing ◽  
Cutting Parameters ◽  
Micro Machining ◽  
Machining Processes ◽  
Steel Alloys ◽  
Diamond Blade ◽  
Micro Features

This paper explores the modeling of incipient cutting by Abaqus, LS-Dyna, and Ansys Finite Element Methods (FEMs), by comparing also experimentally the results on different material classes, including common aluminum and steel alloys and an acetal polymer. The target application is the sustainable manufacturing of gecko adhesives by micromachining a durable mold for injection molding. The challenges posed by the mold shape include undercuts and sharp tips, which can be machined by a special diamond blade, which enters the material, forms a chip, and exits. An analytical model to predict the shape of the incipient chip and of the formed grove as a function of the material properties and of the cutting parameters is provided. The main scientific merit of the current work is to approach theoretically, numerically, and experimentally the very early phase of the cutting tool penetration for new sustainable machining and micro-machining processes.

Experimental Study on the Failure Criterion for Brittle Materials in Compression

2011 ◽  
Vol 320 ◽  
pp. 259-262
Author(s):  
Xu Ran ◽  
Zhe Ming Zhu ◽  
Hao Tang
Keyword(s):  
Thin Film ◽  
Experimental Study ◽  
Compressive Strength ◽  
Fracture Mechanics ◽  
Failure Criterion ◽  
Brittle Materials ◽  
Experimental Results ◽  
Experiment Study ◽  
Confining Stress ◽  
Theoretical Results

The mechanical behavior of multi-cracks under compression has become a very important project in the field of fracture mechanics and rock mechanics. In this paper, based on the previous theoretical results of the failure criterion for brittle materials under compression, experiment study is implemented. The specimens are square plates and are made of cement, sand and water, and the cracks are made by using a very thin film (0.1 mm). The relations of material compressive strength versus crack spacing and the lateral confining stress are obtained from experimental results. The experimental results agree well with the failure criterion for brittle materials under compression, which indicates that the criterion is effective and applicable.

Werkzeuge der ultraschallunterstützten Bearbeitung*/Modelling of an Actorsystem - Development of a tool for ultrasonic assisted machining with an axial-tangential vibration vector

2018 ◽  
Vol 108 (01-02) ◽  
pp. 53-57
Author(s):  
K. Drewle ◽  
T. Stehle ◽  
H: Möhring
Keyword(s):  
Contact Zone ◽  
Brittle Materials ◽  
Wird Eine ◽  
Alternative Method ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Machining ◽  
Hard And Brittle Materials ◽  
Feed Axis

Die schwingungsunterstützte Bearbeitung hat sich bereits bei der Zerspanung von hartspröden Werkstoffen mit einer einachsigen Schwingung in der Kontaktzone bewährt. Untersuchungen zu schwingungsunterstützten Bohrprozessen beschränken sich bisher auf eine Schwingungserzeugung, die entlang der Vorschubachse ausgerichtet ist. Für alternative Schwingungsrichtungen fehlt in erster Linie die geeignete Aktorik. In diesem Beitrag wird eine alternative Methode zur Erzeugung einer axial-tangentialen Schwingung in der Kontaktzone untersucht.   Ultrasonic assisted machining with uniaxial vibration is a well-proven process for machining hard and brittle materials. Existing investigations of vibration assisted drilling and boring processes so far are limited to an oscillation along the feed axis, which primarily due to nonexistent actuators. This contribution will present investigations into an alternative method for creating axial-tangential vibrations in the tool contact zone.

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