日本日立公司开发出能够切削HRC60以上高硬度材料的立铣刀。这些高硬度材料的加工,以前一直采用磨削加工和放电加工。由于高硬度材料在热处理前已进行了粗加工,加工余量在0.1mm以下,因此,加工精度与刀具寿命同样重要,该立铣刀横截面为六角形,以增强刚性;采用韧性强的材料,经过 Hitachi Ltd. has developed an end mill capable of cutting high-hardness materials up to HRC60. These high-hardness materials have been machined and discharged before. Since the high hardness material has been rough machined before the heat treatment, the machining allowance is below 0.1 mm, so the machining accuracy is as important as the tool life. The cross section of the end mill is hexagonal in order to enhance the rigidity. Using the tough material ,after