The Experts below are selected from a list of 24066 Experts worldwide ranked by ideXlab platform

Masatoshi Yoshizaki - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Fine Particle Bombarding Process on Tooth Surface Properties and Tooth Surface Strength of Carburized Gears (1st Report, Effect on Tooth Surface Properties)
    Transactions of the Japan Society of Mechanical Engineers. C, 2007
    Co-Authors: Masatoshi Yoshizaki
    Abstract:

    Fine particle bombarding (denoted as FPB) is one of the surface modification processes that makes fine (20-200μm in diameter) and hard (Hv 750-1000) particles impact with the metal surface at a high speed (more than 100 m/s), which is similar to shot peening. Although FPB has been already applied to extend lifetimes of a die and a metal cutting tool, and to reduce friction on the contact surface, the influence on the tooth surface strength of Gears has not been clarified. The purpose of this study is to determine quantitatively the effect of FPB on the tooth surface strength of carburized Gears and to clarify the factors caused by FPB that influence on the tooth surface strength. First, the author examined the tooth surface properties such as residual stress, roughness, hardness, surface texture, etc. using Test Gears processed by the FPB under three different conditions of arc height. A Test Gear performed by conventional impeller-type shot-peening was also used for comparison with the FPB. Next, durability Tests were carried out using the Gears to measure the tooth surface strength. The results showed that the FPB is effective to increase the tooth surface strength compared to conventional shot-peening. In the 1st report, the effect of the FPB on the tooth surface properties is described.

  • Effect of Fine Particle Bombarding Process on Tooth Surface Properties and Tooth Surface Strength of Carburized Gears (2nd Report, Effect on Tooth Surface Strength and Influencing Factors)
    Transactions of the Japan Society of Mechanical Engineers. C, 2007
    Co-Authors: Masatoshi Yoshizaki
    Abstract:

    Recently the application of fine particle bombarding process (denoted as FPB) has been getting wider because of its superior effects compared to conventional shot-peening ; however, the influence on the tooth surface strength of Gears has not been clarified. The purpose of this study is to determine quantitatively the effect of FPB on the tooth surface strength of carburized Gears and to clarify the factors influencing on the tooth surface strength. First, the author examined the tooth surface properties such as residual stress, roughness, hardness, surface texture, etc. using Test Gears processed by the FPB under three different conditions of arc height. A Test Gear performed by conventional impeller-type shot-peening was also used for comparison with the FPB. These results have been described in the 1st report. Next, durability Tests were carried out using the Gears to measure the tooth surface strength. The results showed that the FPB is effective to increase the tooth surface strength by 1.21 to 1.28 times in Hertzian stress compared to conventional impeller-type shot-peening. Then, the following factors caused by the FPB that influence on the tooth surface strength increase were discussed. (1) Produced high residual compressive stress, (2) Increased hardness, (3) Good conformability on the tooth surface, (4) Micro hollows on the tooth surface generated during running. It was found that the latter two are unique factors caused by the FPB process. In the 2nd report, the effect of the FPB on the tooth surface strength is described.

Anthony Estrada - One of the best experts on this subject based on the ideXlab platform.

  • The vector network analyzer - an essential tool in modern ATE measurements
    IEEE Instrumentation & Measurement Magazine, 2012
    Co-Authors: Anthony Estrada
    Abstract:

    The Vector Network Analyzer (VNA) is a modern piece of Test Gear that was once relegated to specialized measurements in the RF lab. The instrument was large, expensive, and primarily used by the designers of the lower level RF modules. It really did not offer a reasonable performance advantage that would justify the increased cost to have it added to the standard ATE system. Older VNAs were often delicate and larger than the balance of the RF Test Gear. As technology has advanced and Test frequencies increased,

  • The Vector Network Analyzer - an essential tool in modern ate measurements
    2011 IEEE AUTOTESTCON, 2011
    Co-Authors: Anthony Estrada
    Abstract:

    The Vector Network Analyzer (VNA) is a modern piece of Test Gear that was once relegated to specialized measurements in the RF lab. The instrument was large, expensive, and primarily used by the designers of the lower level RF modules. It really didn't offer a reasonable performance advantage that would justify the increased cost to have it added to the standard ATE system. Older VNAs were often delicate and larger than the balance of the RF Test Gear.

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

  • Effects of lubricant on the surface durability of an injection molded polyamide 66 spur Gear paired with a steel Gear
    Tribology International, 2019
    Co-Authors: Bharti Sarita, S. Senthilvelan
    Abstract:

    Abstract In this study, a lubricant was utilized to improve the performance of an injection molded PA66 Gear, and evaluations were carried out using a power absorption Test rig. The observation of scuffing on the Test Gear under lubricated conditions in the Gear tooth between the start of active profile (SAP) and the lowest point of single tooth contact (LPSTC) confirmed the maximum predicted Gear tooth temperature in this region. A lower film thickness between the SAP and LPSTC region compared to the pitch region also contributed to the scuffing failure. The failure morphology of the Test revealed tooth subsurface cracking in the pitch region and scuffing in the flank region under dry and lubricated condition respectively.

  • effect of rotational speed on the performance of unreinforced and glass fiber reinforced nylon 6 spur Gears
    Materials & Design, 2007
    Co-Authors: S. Senthilvelan, R Gnanamoorthy
    Abstract:

    Polymer Gears used in power and motion transmission work under different loads and speeds. Mechanical properties of the polymers are severely influenced by the loading rate compared with the metals. The Gear rotational speed decides the loading frequency of the polymer Gear tooth, which influences the temperature generated and thereby the strength of the material. Performance of polymer base Gears at different Gear rotational speeds is reported in this paper. Injection molded unreinforced Nylon 6 and 20% short glass fiber reinforced Nylon 6 spur Gears were Tested at various speeds and torque levels in a power absorption type Gear Test rig. Gear rotational speed affects the performance of Gears made of both the materials at high running speeds and high Test torques and not in low speeds and torque levels. On-line measurement of Test Gear surface temperature and failure analysis was done to understand the failure mechanisms. At all the investigated Gear speeds, glass fiber reinforced Nylon 6 Gears shows superior performance over unreinforced Nylon 6 Gears due its superior mechanical strength and resistance to thermal deformation.

R Gnanamoorthy - One of the best experts on this subject based on the ideXlab platform.

  • effect of rotational speed on the performance of unreinforced and glass fiber reinforced nylon 6 spur Gears
    Materials & Design, 2007
    Co-Authors: S. Senthilvelan, R Gnanamoorthy
    Abstract:

    Polymer Gears used in power and motion transmission work under different loads and speeds. Mechanical properties of the polymers are severely influenced by the loading rate compared with the metals. The Gear rotational speed decides the loading frequency of the polymer Gear tooth, which influences the temperature generated and thereby the strength of the material. Performance of polymer base Gears at different Gear rotational speeds is reported in this paper. Injection molded unreinforced Nylon 6 and 20% short glass fiber reinforced Nylon 6 spur Gears were Tested at various speeds and torque levels in a power absorption type Gear Test rig. Gear rotational speed affects the performance of Gears made of both the materials at high running speeds and high Test torques and not in low speeds and torque levels. On-line measurement of Test Gear surface temperature and failure analysis was done to understand the failure mechanisms. At all the investigated Gear speeds, glass fiber reinforced Nylon 6 Gears shows superior performance over unreinforced Nylon 6 Gears due its superior mechanical strength and resistance to thermal deformation.

Wang Yong-bing - One of the best experts on this subject based on the ideXlab platform.

  • Tractor Two Shaft Gear Heat Treatment Process Improvement
    Materials for Mechanical Engineering, 2007
    Co-Authors: Wang Yong-bing
    Abstract:

    To enhances Gear contacts fatigue life,reduce heat treatment production cycle and reduce scrap ratess transmission of tractor two shaft 20CrMnTi steel Gear gas carbonitriding composite catalytic were processed improvement.The improvement of the sample before the Test and bench Test Gear were analyzed.The results show that after the heat treatment temperature from 930 ℃ to 860 ℃,penetrating time from 7 h shortened to 4.5 h,improve product wear resistance,hardness of the surface,the rate of identification of 92%.The average life expectancy increased 50%,the new technology has been applied to industrial production.