중공 스프링은, 강관의 내면의 전체에 걸쳐 표면 조도의 평균값이 10 ㎛ 보다 작은 것이고, 및/또는 내면의 전체에 압축 잔류 응력을 부여한 것이어도 되고, 관상 부재 (10) 의 제 1 단 (11) 과 제 2 단 (12) 사이에서 관 내에 점탄성을 갖는 연마 미디어 (200) 를 흘려 관의 내면을 연마하는 공정에 의해 제조되고, 연마 미디어 (200) 는, 점탄성을 갖는 모재와, 입자상의 연마제를 포함하는 것이어도 되고, 강관의 내면을 균일하게 연마하여, 표면 조도를 저감하고, 및/또는 압축 잔류 응력을 부여함으로써 피로 수명을 향상시킨다.

    A hollow spring includes a steel tube in which the average of surface roughness is smaller than 10 µm across the entire inner surface of the steel tube and/or compressive residual stress is given to the entire inner surface of the steel tube. The hollow spring may be manufactured by a step of polishing the inner surface of the steel tube by flowing a viscoelastic abrasive medium (200) within the tubular member (10), between a first opening (11) and a second opening (12) of the tubular member (10). The abrasive medium (200) may include a viscoelastic base material and a granular abrasive. The inner surface of the steel tube is polished evenly to reduce the surface roughness and/or is given compressive residual stress to increase the fatigue life of the hollow spring.


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    Title :

    HOLLOW SPRING AND MANUFACTURING METHOD THEREOF


    Additional title:

    중공 스프링 및 그 제조 방법


    Publication date :

    2020-09-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B60G VEHICLE SUSPENSION ARRANGEMENTS , Radaufhängungen und Federungen für Fahrzeuge / B24B MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING , Maschinen, Einrichtungen oder Verfahren zum Schleifen oder Polieren / B24C ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL , Abschleifendes oder ähnliches Abstrahlen mit teilchenförmigem Werkstoff



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