高張力鋼板の角筒深絞りにおける焼付き現象 [in Japanese] Galling Behavior in Square Cup Drawing of High-Tensile-Strength Steel [in Japanese]
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To investigate the galling behavior on the macroscale in a square cup drawing of high-tensile-strength steel, a series of experiments was carried out under semidry or dry conditions. Cold alloy tool steel (SKD11) and its improved material (SLD), and austempered ductile iron (ADI) were used as noncoated dies. TiCN (PVD), TiCN (CVD), TiC (CVD) and diamond-like carbon-Si (DLC-Si (DC-PACVD)) coated on SKD11 were used as coated dies. The experiments using noncoated dies showed that macroscale galling can be observed clearly on the dies and drawn cup surface with a few drawing cycles. On the die surface, galling occurs at the bottom of the boundary between the straight and corner, and grows upward with the number of drawing cycles. Galling on the drawn cup starts at the top of the same boundary and grows downward with the number of drawing cycles. In the case of coated dies with the drawing cycle number N = 120, no galling on the macroscale can be observed on the dies and drawn cup surface, but microscale adhesion can be observed on TiCN (PVD) or TiCN (CVD) at the same boundary as noncoated dies. No conspicuous adhesion can be observed on TiC (CVD) or DLC-Si (DC-PACVD) when N reached 1000, but microscale adhesion can be noted on TiC (CVD) and no adhesion can be found on DLC-Si (DC-PACVD).
- Journal of the Japan Society for Technology of Plasticity
Journal of the Japan Society for Technology of Plasticity 47(549), 988-992, 2006-10-25
The Japan Society for Technology of Plasticity