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Characterization of Direct Laser Metal Forming Technology for the Restoration of Mold Surface

레이저 직접금속성형기술을 이용한 금형재 표면보수 특성 연구

  • 손영명 (부산대학교 기계공학부) ;
  • 장정환 (부산대학교 기계공학부) ;
  • 주병돈 (부산대학교 기계공학부) ;
  • 임홍섭 (부산대학교 기계공학부) ;
  • 문영훈 (부산대학교 기계공학부/정밀정형 및 금형 가공연구센터)
  • Published : 2009.07.01

Abstract

Direct laser metal forming technology was applied to restore the damaged mold surface. In order to estimate melting characteristics of the $20{\mu}m$ Fe-Cr-Ni powder, single layer experiments were performed at various levels of heat input. The process window of the $20{\mu}m$ Fe-Cr-Ni powder provided feasible process parameters for the smooth regular surface. The cross hatching scanning strategy on the multiple layer experiment was performed to reduce the thickness non-uniformity of edge portions compared with the one direction scanning. To estimate the coherence between the melted powder and the basematal, the tendency of hardness distribution has been observed. The hardness of the melted and the remelted zone was distributed from 400HV to 600HV. It is over 2 times compared of the hardness of the basemetal. Experimental results show that the mold restoring process using direct laser metal forming can be successfully applied in the mold repair industry.

Keywords

Direct Laser Metal Forming;Fiber Laser;AISI H13

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