NHK International Corporation

Novi, MI, United States

NHK International Corporation

Novi, MI, United States
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Ashida Y.,NHK International Corporation | Nishizawa S.,NHK International Corporation
International Symposium on Flexible Automation, ISFA 2016 | Year: 2016

A potentiostat/galvanostat system is used for conducting electrochemical experiments in aqueous environments. The conventional method is to use one sample for investigation in each experiment. To maximize the usage of a single unit electrochemical testing system, a multi-sample and multi-channel technique was developed to simultaneously test multiple metal samples. In this paper, the following are described in detail. • preparation of a multi-sample testing piece as the working electrode of the electrochemical system; • configuration of a multi-channel data acquisition system for recording data when running a test; • separation of data channels by post-test data processing. This technique allows the electrochemical system to study corrosion behavior of multiple samples in the same testing solution under the same environmental conditions, so that the accuracy of material comparison can also be significantly improved. © 2016 IEEE.


Ashida Y.,NHK International Corporation | Sumiyoshi I.,NHK America Suspension Components Inc.
NACE - International Corrosion Conference Series | Year: 2017

In the production of suspension coil springs and stabilizer bars for automotive vehicles, surface pretreatment such as zinc phosphate pretreatment and subsequent resin powder coating are critical processes to prevent the carbon steel substrate from corrosion and cracking. To retain the effectiveness of corrosion resistance, reduce production costs, and avoid overdesign of coating thickness, it is very important to understand the correlation between localized corrosion and the protectiveness of coating and pretreatment. In this study, a coupled multielectrode array sensor (CMAS) is used for pretreatment and coating evaluation on carbon steels. The preliminary testing results are summarized and discussed for further application. © 2017 by NACE International.


Ashida Y.,NHK International Corporation
NACE - International Corrosion Conference Series | Year: 2017

This study focuses on a better understanding of pitting and crevice corrosion on coating surface damaged carbon steels in automotive applications. Immersion and cyclic polarization tests were conducted on bare and coated metals in a 5% NaCl solution. The morphology of localized corrosion, including a filiform appearance, was characterized after exposure to the corrosive environment. To simulate the coating damage of automotive suspension coil springs and stabilizer bars under road conditions, a sharp-tipped scratching awl was used to create scratches and indents. Localized corrosion on the zinc phosphate (ZnP) pretreated and coating damaged surface was investigated in a 24-hour immersion test. The correlation between localized corrosion and metal substrate exposure is studied. Key factors affecting the localized corrosion of carbon steels with damaged coating are discussed. © 2017 by NACE International.


Ashida Y.,NHK International Corporation
NACE - International Corrosion Conference Series | Year: 2016

This study focuses on a better understanding of significant pitting corrosion on coating surface damaged carbon steels, or low alloy steels, during salt spray testing for automotive applications. Anodic cyclic polarization test was used to evaluate the severity of pitting corrosion, and to estimate the corrosion rate of raw materials. Corrosion potential Ecorr, pitting potential Epit, and pitting protection potential Epp were measured by conducting anodic cyclic potentiodynamic polarization (CPP) on 3 carbon steels. The scattering of the three potentials were observed within 35 mV on a 1 cm2 exposure surface of the 3 steels. To simulate the surface damage on automobile suspension coil springs and stabilizer bars, gravel shocking and a hardness indenter were used to generate damage on ZnP pretreated and coated shot peening surfaces. The corrosion potential evolution of steel substrate, ZnP pretreated surface, and damaged coating surface were monitored in 5% NaCI solution for 72 hours. The timing of pretreatment exposure and metal substrate exposure to the NaCI solution were noticeable. A pitting model and a correlation between pitting occurrence and fatigue cracking are further discussed. © 2016 by NACE International.


Raeymaekers B.,University of California at San Diego | Helm S.,University of California at San Diego | Brunner R.,University of California at San Diego | Fanslau E.B.,NHK International Corporation | Talke F.E.,University of California at San Diego
Wear | Year: 2010

Fretting wear of the dimple/gimbal interface in a hard disk drive suspension is investigated. The energy dissipated between the dimple and the gimbal spring is determined as a function of operating conditions and material properties, and related to the wear observed at the interface. Abrasive, adhesive and tribo-chemical wear are found to be present. A thin film of gold on the gimbal resulted in the best wear behavior. © 2010 Elsevier B.V. All rights reserved.


Patent
Nhk International Corporation and Nhk Spring Co. | Date: 2015-02-12

A coil spring modeling apparatus includes an actuator unit formed of a Stewart-platform-type parallel mechanism, a first inner load cell accommodated in a first attachment member, a second inner load cell accommodated in a second attachment member, and a rotation support mechanism. The actuator unit is rotatably supported by the rotation support mechanism about an axis. The first inner load cell is arranged on the first seat adapter coaxially with the rotation support mechanism, and detects an axial force acting on the lower spring seat and a moment. The second inner load cell is arranged under the second seat adapter coaxially with the rotation support mechanism, and detects an axial force acting on the upper spring seat and a moment.


Patent
Nhk International Corporation and Nhk Spring Co. | Date: 2015-02-12

A coil spring modeling apparatus includes a first attachment member disposed on a lower spring seat, a second attachment member disposed on an upper spring seat, an actuator unit formed of a Stewart-platform-type parallel mechanism, a hydraulic pressure supply device, a torsion detection mechanism, and a controller. The torsion detection mechanism is constituted of displacement gauges such as a linear variable differential transformer. The displacement gauges are provided on hydraulic cylinders, and detect amounts of displacement relative to the reference lengths of the hydraulic cylinders, respectively. The controller calculates a relative torsional angle between the first attachment member and the second attachment member based on the detected displacement.


Patent
Nhk Spring Co. and Nhk International Corporation | Date: 2015-02-12

A coil spring modeling apparatus includes a first attachment member disposed on a lower spring seat, a second attachment member disposed on an upper spring seat, an actuator unit formed of a Stewart-platform-type parallel mechanism, a spring height detection mechanism, and a controller. The spring height detection mechanism is constituted of displacement gauges such as a linear variable differential transformer. These gauges are provided on hydraulic cylinders, and detect amounts of displacement relative to the reference lengths of the hydraulic cylinders, respectively. A hydraulic pressure supply device is controlled by the controller and supplies fluid pressure according to the displacement detected by the gauges to the respective hydraulic cylinders.


Patent
NHK Spring Co. and NHK International Corporation | Date: 2010-06-10

A stabilizer bar is intended for use in a vehicle, and a torsion part of the stabilizer bar is fixed to the vehicle body by a fixing member. A resin sheathing is provided integrally on an outer peripheral surface of the stabilizer bar. The fixing member is composed of the sheathing, a rubber bush disposed on the outer periphery of the sheathing, and a mounting fixture for mounting the rubber bush on the vehicle body side so as to cover the outer periphery of the rubber bush. The sheathing and the rubber bush are immovably assembled to each other. Thus, there may be provided a vehicle stabilizer, highly durable, easily mountable and replaceable, low-cost, and highly operable.


Patent
Nhk International Corporation and Nhk Spring Co. | Date: 2012-05-14

A stabilizer bar is intended for use in a vehicle, and a torsion part of the stabilizer bar is fixed to the vehicle body by a fixing member. A resin sheathing is provided integrally on an outer peripheral surface of the stabilizer bar. The fixing member is composed of the sheathing, a rubber bush disposed on the outer periphery of the sheathing, and a mounting fixture for mounting the rubber bush on the vehicle body side so as to cover the outer periphery of the rubber bush. The sheathing and the rubber bush are immovably assembled to each other. Thus, there may be provided a vehicle stabilizer, highly durable, easily mountable and replaceable, low-cost, and highly operable.

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