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

当一个工具被反复使用来切割木材时，切削刃会以这样一种方式磨损，使刀刃的尖端变成圆形。本研究开发了一种自锐木工刀具，通过在刀具背面涂覆极薄的碳化钒来实现刀具的自锐。这种VC涂层抑制了背面的磨损，也保持了刃口的锋利性，因为主要来自未涂层的面侧的渐进磨损。首先，对不同树种的风干木材进行了低速正交切削试验。vc涂层工具显示出良好的自锐特性，就像Cr（铬）涂层工具一样，使用所有木材，包括含有二氧化硅的Melapi。其次，进行了高速外圆上铣试验。vc涂层刀具在各种基材的加工中表现出自锐性。在这种切削中，基材的耐磨性越小，刀具寿命越短。唯一显示刀具寿命足够长，可以实际使用的基材是最强大的粉末高速钢的ASP60和HAP72。而最易碎的合金工具钢SKS3、SX105V和SKD61则表现出良好的自锐性，可用于云杉的切削加工。此外，涂层的ASP60和HAP72刀具在云杉切削中不表现出自锐性。而VC对其耐磨性有明显的改善。他们似乎也有足够的实用性用于切割云杉。其次，注意涂层层的厚度与自锐化速度的关系。在上述实验中，对SKH51表面涂有VC涂层的刀具进行了中等耐磨性测试。用SKH51基材切削墨拉皮时，自锐涂层的有效厚度范围在10 ~ 25 μ m之间。然而，在使用SKS3基材切削云杉时，发现自锐涂层的有效厚度范围在1 ~ 6 μ m之间。少

As a tool is repeatedly used to cut wood, the cutting edge abrades in such a way that the tip of the edge becomes round. This research was carried out to develop a self-sharpening woodworking tool, such self-sharpening being realized by coating the back surface of the tool with very thin VC(vanadium carbide). This VC coating restrains abrasion on the back surface, and also maintains sharpness of the cutting edge due to the progressive abrasion mainly from the uncoated face side.First, a low speed orthogonal cutting test, was carried out on the air-dried woods of various species. The VC-coated tool showed a fine self-sharpening characteristic like the Cr-(chromium)coated tool with all wood species used, including Melapi containing silica.Next, a high speed peripheral up-milling test was carried out. With all kinds of substrates used in cutting Melapi, VC-coated tools showed the self-sharpening characteristic. In such cutting, the smaller the abrasion-resistant of the substrate, the shor … More ter-was the tool life. The only substrates which showed tool life long enough to be of practical use were ASP60 and HAP72 of the most powerful powder high speed steel. On the contrary, SKS3, SX105V, and SKD61 of the most fragile alloy tool steel showed a fine self-sharpening characteristic that was of practical use, in cutting of Spruce. Furthermore, the coated tools of ASP60 and HAP72 did not show the self-sharpening characteristic in cutting of Spruce. However, their abrasion resistances were considerably improved by VC. They also seemed to have sufficient practicality for use of cutting Spruce.Next, attention was given to the thickness of a coating layer in relation to the speed of self-sharpening. The tools with VC coating on SKH51 that showed intermediate abrasion resistance in the above experiment were tested. The effective range of coating thickness for self-sharpening was found to be between 10 mum and 25 mum in cutting Melapi by the tool with SKH51 substrate. However in the cutting of Spruce using the tool with SKS3 substrate, the effective range of coating thickness for self-sharpening, was found to be between 1 mum and 6 mum. Less