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RCF 1 ROLLING CONTACT FATIGUE RIG   (구름 피로 시험 장치)

(TWO ROLLER 타입, MAX 30,000RPM/Max 12kN 초고속제어 시험장치

--->Roller Bearing, 탄성유체윤활, 구름접촉피로도, PITTING, WHITE ETCHING LAYER 시험

        TWO ROLLER 타입                   

aniblue12_next.gif베어링 구름 피로 시험 전용기--모델 RCF2

             ---(볼베어링,CONE ON ANGULAR, 트러스트 베어링, BACK TO BACK ANGUALR 베어링)

                                                              

RCF 1 ROLLING CONTACT FATIGUE MACHINE

Keywords:(시험분석 요소)

  • bearing materials(베어링 재료)
  • elastohydrodynamic lubrication(탄성유체윤활 시험)
  • pitting(모재 표면에 생긴 부식에 의한 점 형태의 자국. 또, 기어의 치면(齒面) 등이 높은 접촉 압력의 반복에 의하여 국부적 피로 때문에 침식되는 현상.)
  • rolling contact fatigue(구름 선 접촉 피로 시험-->헤르쯔접촉 응력에 의한 표면의 누적피로로 인해 발생, 수명 계산식의 기초로 되는 플레킹과, 표면 결함                                 속에 윤활 기름이 유체 역학적으로 침입한 결과 발생하는  균열이   원인으로 되어 생기는 피팅이 대표 예이다.)
  • white etching layers  (WEL은 철도 레일과 휠 상호접촉면에서, 급가속 급정지의 현상이 계속적으로 발생하면서 표면에 피로가   누적되어 발생되는                                 표면층을  의미한다).

Description:

The RCF 1 Rolling Contact Fatigue Machine is a modified version of the TE 74S Two Roller Machine, with the drive to upper roller removed. The upper roller specimen is reduced to a simple cylindrical roller running in rolling contact with a driven lower roller. The machine is designed for performing rolling contact fatigue tests under conditions of elastohydrodynamic lubrication, with well filtered lubricant feed, thus minimizing the potential for adhesive, abrasive or oxidative wear or surface propagated micro-pitting; the intended failure mechanism is thus by pressure generated, sub-surface propagated, flaking or spalling.

The upper roller specimen is 20 mm in diameter and carried in roller bearings. The lower driving roller is 100 mm diameter and may have a flat or crowned surface. It is connected via a cardan shaft to an a.c. vector motor and may be driven at a maximum speed of 6,000 rpm. At this speed, the upper roller will rotate at 30,000 rpm, generating 500 fatigue cycles per second.

The “race-way” surface temperature (the running surface of the lower roller) and the upper roller end-face surface temperatures are monitored by pyrometers and a vibration sensor with adjustable level trigger circuit is provided for stopping the machine at the on-set of rolling contact fatigue.

Control and Data Acquisition:

The RCF 1 has PC based sequence programmable control and data acquisition. This is provided by an integrated Serial Link Interface Module and COMPEND 2000 software running on a host PC, operating under Windows. Data is stored to hard disc in standard spread sheet compatible file formats (.csv or .tsv).

Tests are defined by a sequence of steps, each step containing set-point, data recording rates and alarm level information. Set-points may be adjusted by step change or ramp. The test sequence is followed unless interrupted by the operator or an alarm. Set-points may also be adjusted manually using on screen toggles.

Computer Controlled Parameters:

  • Motor speed
  • Applied load
  • Test fluid temperature
  • Test duration

    Manually Controlled Parameters:

  • Test lfuid flow rate

    Measured Parameters:

  • Measured Parameters
  • Motor speed
  • Applied load
  • Lubricant inlet temperature
  • Lower Roller Race-way Temperature
  • Upper Roller End-face Temperature
  • Vibration sensor output

    Specification:

    Contact Configurations: Flat Roller on Flat Roller (Line Contact)
    Flat Roller on Crowned Roller (Elliptical Contact)
    Maximum Load: 12 kN
    Loading Rate: 50 N/s
    Temperature Range: Ambient to 150°C
    Upper Roller Diameter: 20 mm
    Lower Roller Diameter: 100 mm
    Upper Roller Maximum Speed: 30,000 rpm
    Lower Roller Maximum Speed: 6,000 rpm
    Interface: SLIM 2000 Serial Link Interface Module
    Software: COMPEND 2000
    Motor: 1.5 kW a.c. vector motor, 2048 ppr encoder, force vent

    Services:

    Electricity: 220/240 V, single phase, 50/60 Hz, 3 kW
    Clean, dry air: 4 cfm at 8 bar (120 psi)
    Mains water and drain: 10 l/min (typical)
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