The development of a woodworking knife having self-sharpening characteristics by the application of hard chrome plating only on the back.

本研究的目的是开发一种具有自锐特性的刀，只在刀的背面镀硬铬。在第一个实验中，将风干的木材标本反复正交切割。非镀刀的磨损型是切削刃旁边的表面被木屑摩擦，切削刃尖端被磨圆。刀具材料的韧性值越大，刀尖半径越小。通过实验证明，铬刀具有理想的自锐特性。铬层减轻了后表面的磨损，木屑在表面飞行时产生的摩擦力只对表面进行抛光。因此，在刀的几乎整个寿命期间，镀刀保持了与最初切割时期相同的小切削力和木材表面粗糙度。此外，镀铬刀的耐用性是原来的五倍以上。Aogami-1和SKS-3在刀材镀铬方面优于SKH-51。铬的有效厚度范围为0.6 ~ 3.1 μ m。最佳切片厚度为50 μ m左右。在接下来的实验中，镀铬刀使用超级表面剂对风干木材试样进行了实际测试。在第一次实验结果的基础上，采用了2 μ m的铬厚度和SKS-3刀具材料。镀铬刀在5种木材、0 ~ 60 μ l的偏置角、40 ~ 160 μ l的切屑厚度等3种条件下均表现出优异的自锐性。

The purpose of this study was to develop a knife having self-sharpening characteristics by applying a hard-chrome plating to only the back surface.In the first experiment, air-dried wood specimens were repeatedly cut orthogonally. The wear profile of a non-plated knife was the type in which the face surface next to cutting edge was rubbed by wood chips as well as the cutting edge tip was rounded. Also, the larger the toughness value of knife material, the smaller the radius of its tip became. The chrome knife proved, through this experiment, to have ideal self-sharpening characteristics. The chromium layer lessened the wear on the back surface and only the face surface was polished by frictional force generated when the wood chips flew on the face surface. Therefore, during almost complete life of knife, the plated knife maintained the same small cutting force and wood surface roughness as during the initial cutting period. In addition, the increase durability of the chrome-plated knife was more than five times that of the original. Aogami-1 and SKS-3 appeared to be better than SKH-51 for knife material to be chrome plated. The effective range of chromium thickness was between 0.6 to 3.1 mum. The optimum chip thickness was about 50 mum.In the next experiment, chrome-plated knives were practically tested for cutting air- dried wood specimens using a super surfacer. A chromium thickness of 2 mum and the knife material of SKS-3 were adapted on basis of the first experimental results. In the whole range of three conditions tested, namely, five woods species, various bias angles of 0 - 60ﾟ, various chip thicknesses of 40 - 160 mum, the chrome-plated knives proved to have superior self-sharpening characteristics.