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美国通用电气公司最近研制成功一种新型的烧结碳化钨硬质合金切削刀具。据称,该刀具每年能为金属加工行业节省几百万美元。这种刀具具有独特的凸缘形状,在磨损过程中能自动锐化,这是因凸缘几何形状所引起的细微崩缺的作用。刀具磨损时,凸缘锥形部分的细微切片剥离下来,从而形成新的切削刃。新型刀片呈四方形,每边都有这种独特的凸缘,从而形成四个切削面。它可装置在标准刀夹中,不需要任何特殊装备,这种刀具适用于车削或铣削中的直线加工,切削时,切削深度必须等于或小于凸缘的悬伸长度。在制造这种凸缘刀具时,采用一特殊结构的模型将原始材料(即碳化钨粉末和粘合剂)压制成所需要的形状,再将压制坯料在高温炉中烧结。这种刀具也可采用标准刀片制成,即把它磨成具有特殊形状的凸缘。无论采用何种制造方式,凸缘深度应与所需要的切削深度一致。这种刀具一般是
The United States General Electric recently developed a new type of sintered tungsten carbide cutting tools. Allegedly, the tool can save the metal processing industry millions of dollars each year. This tool has a unique flange shape that sharpens automatically during wear, due to the subtle collapse caused by the flange geometry. When the tool wears off, the fine sections of the conical tapered portion peel off, forming a new cutting edge. The new blades are square, with unique flanges on each side, forming four cutting faces. It can be mounted in a standard tool holder and does not require any special equipment. This tool is suitable for straight machining in turning or milling. The cutting depth must be equal to or less than the overhanging length of the flange during cutting. In the manufacture of such flanged tools, a specially structured model is used to compress the starting material (ie tungsten carbide powder and binder) to the desired shape, and the compact is sintered in a high temperature furnace. The tool can also be made with a standard blade, that is, it is ground into a specially shaped flange. Regardless of the manufacturing method used, the flange depth should be the same as the desired depth of cut. This tool is generally