• 제목/요약/키워드: Induction Surface Hardening

검색결과 49건 처리시간 0.034초

Design of Robot Direct-Teaching Tool and its Application to Path Generation for Die Induction Hardening

  • Ahn, Jae-Hyung;Sungchul Kang;Changhyun Cho;Jisun Hwang;Mansuk Suh
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2002년도 ICCAS
    • /
    • pp.118.5-118
    • /
    • 2002
  • To apply induction hardening method to a press die having 3-D free surface, the induction hardening tool moves on a press die above 1~2mm gap with constant velocity. Since the induction hardening process requires its own hardening path for each die, a direct teaching method which generates working path directly guided by operators is more suitable than an offline method using CAD/CAM data. The direct teaching apparatus in this work includes a teaching tool with a force/torque sensor and data processing computer to finally generate robot's Induction hardening program , in direct teaching operation, an operator teaches working path maintaining contact with surface of press die by holding...

  • PDF

고주파 담금질에 의한 SCM440강의 기계적 특성에 관한 연구 (A Study on the Mechanical Properties by High-Frequency Induction Hardening of SCM440 Steel)

  • 안석환;남기우;김태일;이문용;김동규
    • 한국해양공학회지
    • /
    • 제23권2호
    • /
    • pp.74-80
    • /
    • 2009
  • Surface hardening treatments, such as using the high-frequency induction hardening method, are widely used to increase the fatigue life and prevent the failure of materials by locally increasing the surface hardness. This method, in particular, brings an improvement in static strength by compressive residual surface stress due to the hardening. In this study, the mechanical properties of high-frequency induction hardened SCM440 steel were investigated. These results were also compared with those for base metal and a Q/T (tempering after quenching) treatment specimen. The test results showed that partially high-frequency induction hardened SCM440 steel specimens were more improved in static strength, surface hardness, fatigue limit, and anti-wear than the base metal and Q/T treatment specimens. In particular, the fatigue limit of the high-frequency induction hardened SCM440 steel increased by more than about 52% compared to that of base metal and by about 25% compared to that of the Q/T specimen.

고주파 표면경화퇸 SM53C강의 파괴인성 특성 (Frature Toughness Characteristics of Surface-Hardened SM53C Steel by High Frequency Induction)

  • 박원조;전현배;허정원;김진범
    • 한국안전학회지
    • /
    • 제23권1호
    • /
    • pp.12-17
    • /
    • 2008
  • The earn shaft is very important for the safety of automobiles. The earn shaft needs a surface hardening process by high frequency induction to have both strength and toughness. It is required for safety of automobile to consider how the characteristics of tensile strength and toughness are changed according to the condition of surface hardness. In this study, we prepared surface hardened SM53C which is used as cam shaft materials. We examined the tensile strengths according to the depth of surface hardening and the effect of tempering. We also investigated the fracture toughnesses according to the depth of surface hardening(1mm, 2mm).

고주파 표면열처리된 Cr-Mo강재의 피로특성과 수명예측 (Fatigue Characteristic and Life prediction of Induction Surface Hardened Cr-Mo Steel)

  • 송삼흥;최병호
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1995년도 추계학술대회 논문집
    • /
    • pp.676-679
    • /
    • 1995
  • Practically, induction surface hardening is used widely to enhance the local strength of structure. In this study, Fatigue limit and its S-T characteristic for raw and induction hardened specimen of SCM440 is studied experimentally. The life prediction was considered by Juvinall's equation and its predicted result is compared with experiment.

  • PDF

표면 경화된 탄소강의 비틀림 피로강도에 미치는 조직의 경향 (The Effect of Structure on Torsional Fatigue Strength of Surface Hardened Carbon Steel)

  • 고준빈;김우강;원종호
    • 한국정밀공학회지
    • /
    • 제22권1호
    • /
    • pp.130-136
    • /
    • 2005
  • Induction hardening increases hardness near the surface where it's most needed, and leaves the surface in compression which improves fatigue life. Although case depth and chemical composition are same, the structure of induction hardened shaft affects the fatigue strength and life because of austenization during hardening. Therefore torsional fatigue tests of specimens from various structures, which are obtained by nomalizing, spheriodized annealing and tempering after quenching, were conducted on induction hardened automotive drive shafts with various case depths and loads applied in order to evalute the relation between structure and fatigue strength.

표면 경화된 SM53C의 기계적 특성 및 피로균열진전 거동해석에 관한 연구 (A Study on Mechanical Property and Fatigue Crack Growth Behavior of Surface-Hardened SM53C Steel)

  • 김황수;김정현;전현배
    • 한국기계가공학회지
    • /
    • 제9권4호
    • /
    • pp.44-52
    • /
    • 2010
  • Recently, with the high performance and efficiency of machine, there have been required the multi-functions in various machine parts, such as the heat resistance, the abrasion resistance and the stress resistance as well as the strength. Fatigue crack growth tests were carried out to investigate the fatigue characteristics of high carbon steel (SM53C) experienced by high-frequency induction treatment. The influence of high-frequency induction treatment on fatigue limit was experimentally examined with the specialfocus on the variation of surface microstructure and the fatigue crack initiation and propagation through fractography. Also, the shape of hardening depth, hardened structure, hardness, and fatigue-fracture characteristics of SM53C composed by carbon steel are also investigated.

고주파 열처리 강에 대한 피로강도에 미치는 경향 (The effect on Fatigue Strength of Induction Hardened Carbon Steel)

  • 고준빈;김우강;원종호
    • 한국공작기계학회논문집
    • /
    • 제14권6호
    • /
    • pp.83-87
    • /
    • 2005
  • Hardening Constant Velocity joint increases hardness near the surface and the surface improves fatigue life. Although case depth and chemical composition are same, the prior structure of induction hardened Constant Velocity Joint affects the fatigue strength and life during hardening. Therefore torsional fatigue tests of specimens from vaere conducted on induction hardened automotive Constant Velocity joint with various case depths and lrious prior structures, which are obtained by nomalizing, spheriodized annealing and tempering after quenching, woads applied in order to evaluate the relation between prior structure and fatigue strength.

고주파 열처리를 고려한 액슬 축 비틀림 거동 연구 (A study on torsional strength of induction hardened axle shaft)

  • 강대현;이범재;윤창배;김강욱
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2008년도 추계학술대회A
    • /
    • pp.459-463
    • /
    • 2008
  • Induction hardening has been used to improve torsional strength and characteristics of wear for axle shaft which is a part of automobile to transmit driving torque from differential to wheel. After rapidly heating and cooling process of induction hardening, the shaft has residual stress and material properties change which affect allowable transmit torque. The objective of this study is to predict the distribution of residual stress and estimate the torsional strength of induction hardened axle shafts which has been residual stress using finite element analysis considered thermo mechanical behavior of material and experiments. Results indicate that the torsional strength of axle shaft depends on the surface hardening depth and distribution of residual stress.

  • PDF

고주파 표면경화재의 내부개재물의 분포와 피로강도에 관한 연구 (A Study on the Distribution of Internal Inclusions and the Fatigue Strength of Induction Surface Hardened Steel)

  • 송삼홍;최병호
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2000년도 추계학술대회논문집A
    • /
    • pp.333-338
    • /
    • 2000
  • Induction surface hardening is widely used to enhance local strength and hardness. However, most research is only to have a focus on fatigue life and fatigue behavior is not so much studied. So, in this study, Cr-Mo steel alloy(SCM440) was used to show the effect of residual stress and micro hole on the fatigue strength for base metal and induction surface hardened specimen. In addition, the fatigue characteristic between surface hardened and fully hardened steel is somewhat different. It is caused by hardness distribution, residual stress and inclusions etc.. Crack origins are generally micro inclusions for the high strength steel. So, the distribution of inclusions is analyzed statistically.

  • PDF

SM45C강의 연속파 Nd:YAG레이저표면경화와 고주파표면경화특성 비교 (Comparison of Characteristics on Induction and Continuous Nd:YAG Laser Surface hardening of SM45C Steel)

  • 신호준;유영태;안동규;신병헌
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2005년도 추계학술대회 논문집
    • /
    • pp.176-183
    • /
    • 2005
  • Laser heat treatment technology is used for improving the feature of fatigue resistance and wear resistance in mobile parts. The purpose of this study is to compare the characteristics of laser heat treatment and high frequency heat treatment, which is commonly used in industrial place. For the preemptive experiment, the distribution, depth and size of hardening and its micro-structural features were compared between surface heat treatment case by defocusing and variables of each process for heat treatment by exclusively manufactured heat treatment optical system. As a result, high frequency heat treatment has wide distribution of hardening depth and width about 3 times larger than laser heat treatment, however, its average hardness showed 621.4Hv which is smaller than the average hardness of laser heat treatment with 691Hv.

  • PDF