• Title/Summary/Keyword: 체결력

Search Result 97, Processing Time 0.158 seconds

Investigation for Clamping Properties of the Tool Clamping Device Based on the Shape Memory Alloy for Application of a Micro Spindle System (소형 스핀들 시스템 적용을 위한 형상기억합금 기반 공구 클램핑 장치의 체결특성 고찰)

  • Shin, Woo-Cheol;Ro, Seung-Kook;Park, Jong-Kweon;Lee, Deug-Woo;Chung, Jun-Mo
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.16 no.6
    • /
    • pp.9-14
    • /
    • 2007
  • In this paper, a rotating tool clamping device was developed based on a shape memory alloy(SMA) and its feasibility as a tool holder was experimentally explored. The SMA-based device was able to alter clamping to unclamping through temperature control within 1 second. The means and repeatability(${\sigma}$) of the tool clamping force were 185.5N and 6N respectively and its drifts were less than 3% for an hour. Considering the temperature hysteresis of the SMA-based tool clamping device, it is necessary to heat the SMA ring to around $50^{\circ}C$ after tool change to obtain more clamping force.

A Study on the Steering Wheel Vibration affected by the Fastening Torque of the Wheel Mounting Hub Bolts of Steel Wheels (스틸휠의 체결력에 따른 조향휠 진동에 관한 연구)

  • 안세진;정의봉;유완석;김명규
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.11 no.4
    • /
    • pp.189-195
    • /
    • 2003
  • The steel wheels are widely used in the passenger cars because of their low cost of production although the aluminum wheels have many advantages in their performance and appearance. It is known that the steering wheel vibration with steel wheels is generated more often than one with aluminum wheels. Both the constant velocity driving test and the m up test are carried out in this study to analyze the causes and path of the steering wheel vibration generated from the steel wheels. And this study shows that the steering wheel vibration is affected by the fastening torque of the wheel mounting bolts between the steel wheel and the suspension disk.

A Diagnosis Case of Structure to Assess Rotor System (회전체의 건전성 평가를 위한 구조물의 진단사례)

  • 양경현;조철환;배춘희;이성호;김성휘
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.11b
    • /
    • pp.832-837
    • /
    • 2001
  • In this paper, we analyzed the characteristic of the broken section for bolts fastening the generator casing, and according to the frequency analysis, we grasped the characteristic of the excited force, traced the path of the exciting source so that we examined a factor of transient vibration of the generator casing. Even if it appears transient vibration again, we applied spring washer and more tensile bolt to the casing to minimize the fracture. By solving troubles of the generator rotor, we reduced the vibration amplitude to the normal condition. So we obtain much more the reliablility of the generator.

  • PDF

A Study on Modeling the Screw for Permanent Fixing and the Simulation of Fixing force (영구 체결용 나사 모델링과 체결력 시뮬레이션에 관한 연구)

  • Lee, S.S.;Prak, J.H.;Kim, M.J.;Park, J.B.;Jeon, E.C.
    • Proceedings of the KSME Conference
    • /
    • 2001.11a
    • /
    • pp.827-833
    • /
    • 2001
  • This study is an introduction of ADS in which we have written out programs which can design three-dimensional machine parts and reduce the required time for design them comparing with other CADs. Among the machine parts, screws are commonly used in joining one part to another because of easy handing but welding and rivet are used to join permanently them even thought hard operation. Consequently, we have developed the screw for permanent fixing using stairs type screw threads, which is considered as the main machine parts in joining. For that, we designed permanent fastened screws according to the different rotation angle using VisualLISP and transferred it to ANSYS, structural solution program, to find out allowance load, maximum equivalent stress and where it occur.

  • PDF

Characteristic of the shrink fit strength using ceramic shaft and metal ring (세라믹 축과 금속림의 열박음 체결력 특성에 관한 연구)

  • 최상훈
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 1996.10a
    • /
    • pp.180-186
    • /
    • 1996
  • Using carbon steel or ceramic as a shaft material of monolithic and slited insert ring clamped on it. The fitting strengths of the sgrink fitted assemblies measured from room temperature to 30$0^{\circ}C$ and following conclusions were obtained as results of this investigation. 1) The fitting condition under which the shrink fitted assemble was stronger than that using simple fit in high temperature. 2) When both material of the 30mm-diameter shaft and 55mm-diameter boss are SM45C the clamping torque is increased 2.7times as the interference increases 3 times from 20${\mu}{\textrm}{m}$ at the contact length of 6mm monolithic fit. 3) When only the material of boss is changed to STS 304 the clamping torque is increased at the rate of 37.3N.m per 1mm increase of the contact length at the interference of 50${\mu}{\textrm}{m}$ monolithic fit.

  • PDF

A Running Safety and Fastening System Investigation of Tilting Train (틸팅열차의 주행안전성 및 체결력 검토)

  • Lee, Ju-Won;Seong, Dae-Jung;Cheon, Ju-Hyun;Eum, Ki-Young;Shin, Hyun-Mock
    • Proceedings of the KSR Conference
    • /
    • 2007.05a
    • /
    • pp.1855-1860
    • /
    • 2007
  • The high speed tilting train has superior advantages which are effects on reductions of running time to non-tilting in curves. But in order that the tilting train is operated in conventional track, it is performed evaluation on the running safety. This study carried out an analysis of running stability of tilting train in conventional curved track. The results obtained through this study will be applied to improve the conventional curved track and determine the limit velocity.

  • PDF

A study on the drawing characteristics of circular drawbead by the Finite Element Method (유한요소법에 의한 원형드로오비드의 인출특성에 관한 연구)

  • 신양호
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.6 no.3
    • /
    • pp.26-35
    • /
    • 1997
  • In this study, the drawing characteristics of circular drawbead are examined with the plane strain elastic-plastic FE Method. Both the clamping load and the drawing load investigated by varying the process variables such as drawbead radius, closing depth and friction condition. The effective strain induced by the draw bead is also investigated. In order to verify the results, the computed results are compared with the existing experimental results. It has been found that both the clamping load and drawing loads are related with the geometry of the bead rather than the lubrication conditions.

  • PDF

Fastening Torque Control Mechanism for Automatic Screw Driver (자동 나사 체결기의 체결력 제어 방법)

  • 오의진
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2000.04a
    • /
    • pp.561-566
    • /
    • 2000
  • A screw driver is essentially used in assembling machine parts and electronic products such as the printed circuit board with a housing. As the parts to be assembled becomes small and precise, the higher precision of the controling screw driver torque is required. However, because the operator controls the fastening torque by his experience, it must be inexact. Thus the screw driver which can exactly control the fastening torque by a bellows is designed and developed in the study. The bellows is expanded by the inner air pressure and contracted and by the spring operation. The bellows driver is composed of the entrance solenoid valve, the exit solenoid valve and the pressure sensor. The pressure sensor senses the bellows pressure. When the pressure sensor output reaches the setting value, it operates the exit solenoid valve not to deliver further torque by letting the air of the bellows out. Through a series of experiments, the performance is studied and verified.

  • PDF

Dynamic Parameter Analysis of Bolted Joint (체결력에 따른 볼트결합부의 동적 파라미터 해석)

  • Baek, Sung-Nam;Ji, Tae-Han;Park, Young-Pil
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.20 no.1
    • /
    • pp.53-67
    • /
    • 1996
  • The dynamic characteristics of mechanical structure are strongly affected by the properties of joint parameters. In this study, the test structures are constructed with two beams which are clamped by bolts, and a bolted joint which is modelled as a lumped stiffness element. To idientify the dynamic joint parameters with variance of clamping torque of bolts, the sensitivity analysis and the mode energy analysis methods are investigated experimentally. As a reult of these two methods, stiffnesses of bolted joint are experimentally found to increase as the clamping torque increases. These stiffnesses identified from the sensitivity analysis and the mode energy analysis method have some difference.

Stress Analysis of a Clamp Chuck for Machining of a Ring Gear (링기어 절삭을 위한 클램프 척의 응력해석)

  • Sim, Han-Sub;Kim, Hae-Ji
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.10 no.3
    • /
    • pp.73-78
    • /
    • 2011
  • This study contains to theory and analysis research for the stress and the translation of an expand disk that fix a ring gear for tooth profile machining. The stress of the expand disk is analysed by the finite element method(FEM) to calculate design parameters. From the analysis results, the stress of the expand shows a linear tendency under various fixing force. This results show that the expand disk have a elastic characteristics as a disk spring. The maximum stress was observed on under side in split section of the expand disk. It is verified that the analysis results are useful to calculate design parameters of the expand disk.