The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Shin-ichi Matsuoka - One of the best experts on this subject based on the ideXlab platform.

  • Ultrasonic welding of ceramics/Metals using Inserts
    Journal of Materials Processing Technology, 1998
    Co-Authors: Shin-ichi Matsuoka
    Abstract:

    Abstract This paper gives a description of an experimental study of the ultrasonic welding of ceramics and Metals using Inserts. Ultrasonic welding has made it possible to weld various ceramics such as Al2O3, SiC, Si3N4, AlN, to Metals at room temperature, quickly and easily compared to other welding methods. For example, the ultrasonic welding of Si3N4/Al/Cu can be accomplished under the conditions of: amplitude of ultrasonic horn top, 23 μm; welding pressure, 20 MPa; and required duration, 1 s. The ultrasonic-welding technique can be carried out in many different ways, such as the direct welding of ceramics/Metals, welding with a Metal coating on the ceramics surface by vacuum deposition and welding with a Metal Insert. The Insert material and the vaporized film used for auxiliary purposes play the role of binders to facilitate welding, but little difference in welding strength was found between the welds with the Metal Insert and the vaporized film. Since ultrasonic vibration cleans the contact surface, there is no need to carry out surface treatment prior to welding.

Nemat Hoseini - One of the best experts on this subject based on the ideXlab platform.

  • comparison of the load deflection characteristics of aesthetic and conventional super elastic ni ti orthodontic arch wires in conventional and Metal Insert ceramic brackets
    Journal of clinical and diagnostic research : JCDR, 2016
    Co-Authors: Hosseinagha Aghili, Soghra Yassaei, Neda Joshan, Nemat Hoseini
    Abstract:

    INTRODUCTION Coated arch wires and ceramic brackets have been introduced to improve aesthetics during orthodontic treatment. AIM The aim of this study was to determine the effects of coating on the physical properties of aesthetic orthodontic wires. MATERIAL AND METHODS Five round wires (0.016 inch) were obtained from each of three brands: conventional uncoated super elastic Nickel Titanium (Ni-Ti) (Rematitian Lite; Dentaurum, Ispringen, Germany), HUBIT (Teflon Coated, Korea), G&H (Epoxy Coated, Greenwood, Indiana, USA) which belonged to maxillary arch. Two types of standard ceramic brackets (conventional and Metal-Insert type, Ortho Technology, Tampa, Florida, USA) with the slot size of 0.022×0.028 inches were used. A simulation device was fabricated to resemble a model of human dental arch and each of the specimen was tested in three-point bending test. The test was conducted in the buccolingual plane with crosshead speed of 1mm/minute pressure from Metal pole. Each sample was loaded until a deflection of 3.0 mm was produced. The mean values of maximum loading force, unloading force and clinical plateau length were recorded. One-way ANOVA and Tukey tests were used at p<0.05. RESULTS Uncoated Ni-Ti arch wire showed higher mean values of maximum loading and unloading force than that of coated aesthetic wires similar to ceramic brackets while G&H wire and Metal-Insert ceramic brackets presented the lowest values. The longest clinical plateau length was observed in G&H wires and Metal-Insert ceramic bracket. CONCLUSION The coating processes for HUBIT (Teflon Coated, Korea), G&H (Epoxy Coated, Greenwood, Indiana, USA) wires might influence bending behaviour which can cause decrease in loading and unloading force.

  • Comparison of the Load-Deflection Characteristics of Aesthetic and Conventional Super Elastic Ni-Ti Orthodontic Arch Wires in Conventional and Metal-Insert Ceramic Brackets.
    Journal of clinical and diagnostic research : JCDR, 2016
    Co-Authors: Hosseinagha Aghili, Soghra Yassaei, Neda Joshan, Nemat Hoseini
    Abstract:

    INTRODUCTION Coated arch wires and ceramic brackets have been introduced to improve aesthetics during orthodontic treatment. AIM The aim of this study was to determine the effects of coating on the physical properties of aesthetic orthodontic wires. MATERIAL AND METHODS Five round wires (0.016 inch) were obtained from each of three brands: conventional uncoated super elastic Nickel Titanium (Ni-Ti) (Rematitian Lite; Dentaurum, Ispringen, Germany), HUBIT (Teflon Coated, Korea), G&H (Epoxy Coated, Greenwood, Indiana, USA) which belonged to maxillary arch. Two types of standard ceramic brackets (conventional and Metal-Insert type, Ortho Technology, Tampa, Florida, USA) with the slot size of 0.022×0.028 inches were used. A simulation device was fabricated to resemble a model of human dental arch and each of the specimen was tested in three-point bending test. The test was conducted in the buccolingual plane with crosshead speed of 1mm/minute pressure from Metal pole. Each sample was loaded until a deflection of 3.0 mm was produced. The mean values of maximum loading force, unloading force and clinical plateau length were recorded. One-way ANOVA and Tukey tests were used at p

Yoshimitsu Okazaki - One of the best experts on this subject based on the ideXlab platform.

  • effect of head size on wear properties of Metal on Metal bearings of hip prostheses and comparison with wear properties of Metal on polyethylene bearings using hip simulator
    Journal of The Mechanical Behavior of Biomedical Materials, 2014
    Co-Authors: Yoshimitsu Okazaki
    Abstract:

    Abstract The effects of articular head size on the wear losses of the Metal Insert and articular head for a Metal-on-Metal bearing were examined using a hip simulator manufactured to satisfy ISO 14242-1. The wear properties of Metal-on-Metal and Metal-on-polyethylene bearings were also compared under the same conditions. The total wear losses of the Metal Insert and articular head decreased with increasing diameter of the Metal Insert in the range from 28 to 44 mm. The total wear loss was greater for a diameter of 48 mm than for a diameter of 44 mm. When the articular Metal Insert diameter was smaller than 44 mm, the wear loss was reduced because the contact surface pressure increased with increasing Metal Insert diameter. However, the increase in wear loss observed for the 48-mm-diameter Insert might have been due to the considerable increase in the rotation moment with increasing Insert diameter. The tendency of decreasing contact pressure calculated using the Hertzian contact stress equation nearly conformed to the change in wear loss. On the other hand, the wear loss of an artificial hip joint consisting of a cross-linked ultrahigh-molecular-weight polyethylene Insert (UHMWPE) and a Co–Cr–Mo articular head was small.

Hosseinagha Aghili - One of the best experts on this subject based on the ideXlab platform.

  • comparison of the load deflection characteristics of aesthetic and conventional super elastic ni ti orthodontic arch wires in conventional and Metal Insert ceramic brackets
    Journal of clinical and diagnostic research : JCDR, 2016
    Co-Authors: Hosseinagha Aghili, Soghra Yassaei, Neda Joshan, Nemat Hoseini
    Abstract:

    INTRODUCTION Coated arch wires and ceramic brackets have been introduced to improve aesthetics during orthodontic treatment. AIM The aim of this study was to determine the effects of coating on the physical properties of aesthetic orthodontic wires. MATERIAL AND METHODS Five round wires (0.016 inch) were obtained from each of three brands: conventional uncoated super elastic Nickel Titanium (Ni-Ti) (Rematitian Lite; Dentaurum, Ispringen, Germany), HUBIT (Teflon Coated, Korea), G&H (Epoxy Coated, Greenwood, Indiana, USA) which belonged to maxillary arch. Two types of standard ceramic brackets (conventional and Metal-Insert type, Ortho Technology, Tampa, Florida, USA) with the slot size of 0.022×0.028 inches were used. A simulation device was fabricated to resemble a model of human dental arch and each of the specimen was tested in three-point bending test. The test was conducted in the buccolingual plane with crosshead speed of 1mm/minute pressure from Metal pole. Each sample was loaded until a deflection of 3.0 mm was produced. The mean values of maximum loading force, unloading force and clinical plateau length were recorded. One-way ANOVA and Tukey tests were used at p<0.05. RESULTS Uncoated Ni-Ti arch wire showed higher mean values of maximum loading and unloading force than that of coated aesthetic wires similar to ceramic brackets while G&H wire and Metal-Insert ceramic brackets presented the lowest values. The longest clinical plateau length was observed in G&H wires and Metal-Insert ceramic bracket. CONCLUSION The coating processes for HUBIT (Teflon Coated, Korea), G&H (Epoxy Coated, Greenwood, Indiana, USA) wires might influence bending behaviour which can cause decrease in loading and unloading force.

  • Comparison of the Load-Deflection Characteristics of Aesthetic and Conventional Super Elastic Ni-Ti Orthodontic Arch Wires in Conventional and Metal-Insert Ceramic Brackets.
    Journal of clinical and diagnostic research : JCDR, 2016
    Co-Authors: Hosseinagha Aghili, Soghra Yassaei, Neda Joshan, Nemat Hoseini
    Abstract:

    INTRODUCTION Coated arch wires and ceramic brackets have been introduced to improve aesthetics during orthodontic treatment. AIM The aim of this study was to determine the effects of coating on the physical properties of aesthetic orthodontic wires. MATERIAL AND METHODS Five round wires (0.016 inch) were obtained from each of three brands: conventional uncoated super elastic Nickel Titanium (Ni-Ti) (Rematitian Lite; Dentaurum, Ispringen, Germany), HUBIT (Teflon Coated, Korea), G&H (Epoxy Coated, Greenwood, Indiana, USA) which belonged to maxillary arch. Two types of standard ceramic brackets (conventional and Metal-Insert type, Ortho Technology, Tampa, Florida, USA) with the slot size of 0.022×0.028 inches were used. A simulation device was fabricated to resemble a model of human dental arch and each of the specimen was tested in three-point bending test. The test was conducted in the buccolingual plane with crosshead speed of 1mm/minute pressure from Metal pole. Each sample was loaded until a deflection of 3.0 mm was produced. The mean values of maximum loading force, unloading force and clinical plateau length were recorded. One-way ANOVA and Tukey tests were used at p

A. S. Varadarajan - One of the best experts on this subject based on the ideXlab platform.

  • A neural network model to predict surface roughness during turning of hardened SS410 steel
    International Journal of System Assurance Engineering and Management, 2020
    Co-Authors: X. Ajay Vasanth, P. Sam Paul, A. S. Varadarajan
    Abstract:

    In manufacture sector, the surface finish quality has considerable importance that can affect the functioning of a component, and possibly its cost. The surface quality is an significant parameter to evaluate the productivity of machine tools as well as machined components. It is also used as the critical quality indicator for the machined surface. In recent years the prediction of surface roughness has become an area of interest for machining industry. Cutting force, cutting temperature, tool wear, and vibration signals are some of the factors that can be used individually to predict surface roughness, but when it is used collectively a more accurate prediction of surface roughness is possible since each of the above-mentioned factors have their own characteristics effects of surface roughness. In the present study, an attempt was made to fuse cutting force, tool wear and displacement of tool vibration along with the cutting speed, feed and depth of cut to predict the surface roughness of hardened SS 410 steel (45 HRC) using a multicoated hard Metal Insert with a sculptured rake face. Regression models and an artificial neural network model were developed to fuse the cutting force, cutting temperature, tool wear and displacement of tool vibration to predict the surface roughness. From the results it was observed that the prediction of surface roughness by the artificial neural network had a higher accuracy than the regression model.

  • Attenuation of vibration in boring tool using spring controlled impact damper
    International Journal on Interactive Design and Manufacturing (IJIDeM), 2017
    Co-Authors: G. Lawrance, A. S. Varadarajan, P. Sam Paul, A. Paul Praveen, X. Ajay Vasanth
    Abstract:

    In boring process due to larger overhanging length of tool holder, tool vibration is considered as a significant factor which results in poor surface finish, noise generation, accelerated tool wear and reduced life period of machine tool. This tool vibration is a result of interaction between Metal cutting process and the dynamics of machine tool. In order to reduce tool vibration it is necessary to develop suitable mechanisms which will in-turn increase the productivity in manufacturing industries. This investigation aims at analyzing the tool holder with impact damper on tool vibration during boring of hardened AISI4340 steel using hard Metal Insert with sculptured rake face. Impact damper used in this study consists of a concentrated mass of predetermined size and shape mounted on the tool shank at a specific location by means of springs. Material of impact damper and the location of the damper on the tool shank for achieving effective damping was determined by using computational analysis. When the damper was mounted on the tool shank, its vibration characteristics got altered and provided an inherent damping capability to the tool holder by suppressing tool vibration. Experimental work was carried out to study the influence of impact damper on tool vibration and cutting performance. From both computational and experimental results, it was observed that tool vibration was reduced effectively when impact damper was embedded with tool holder.

  • Effect of magneto rheological damper on tool vibration during hard turning
    Frontiers of Mechanical Engineering, 2012
    Co-Authors: P. Sam Paul, A. S. Varadarajan
    Abstract:

    Recently, the concept of hard turning has gained considerable attention in Metal cutting as it can apparently replace the traditional process cycle of turning, heat treating, and finish grinding for assembly of hard wear resistant steel parts. The present investigation aims at developing a magneto rheological (MR) fluid damper for suppressing tool vibration and promoting better cutting performance during hard turning. The magneto rheological Fluid acts as a viscoelastic spring with non-linear vibration characteristics that are controlled by the composition of the magneto rheological fluid, the shape of the plunger and the electric parameters of the magnetizing field. Cutting experiments were conducted to arrive at a set of electrical, compositional and shape parameters that can suppress tool vibration and promote better cutting performance during turning of AISI 4340 steel of 46 HRC with minimal fluid application using hard Metal Insert with sculptured rake face. It was observed that the use of MR fluid damper reduces tool vibration and improves the cutting performance effectively. Also commercialization of this idea holds promise to the Metal cutting industry.