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在高速切削细长轴时,由于切削热的影响,工件温度升高,并发生伸长变形,普通顶尖不适应这类车削。因此,我们参照国外资料制成可轴向伸缩活顶尖、简介如下: 结构如附图,顶尖(高速钢,淬火HRC62～65)用C或D级向心球轴承、滚针支承径向力,增强了承载能力。顶尖颈部装入轴承内圈,尾部长环形槽装滚针,中间装上四片厚2.5mm(65mm钢、淬火HRC45～50)的碟形弹簧抵住滚珠轴承的端面,从而克服了轴承的游隙,保证了顶尖的稳定性和良好的精度。滚动轴承外径和装配后的滚针外径与顶尖套孔间隙控制在平均间隙之内(包括零对零),保证能轴向移动,而不产生转动。当工件变形伸长时,推动顶尖、轴承,使碟形
In the case of high-speed cutting of slender shafts, due to the influence of cutting heat, the temperature of the workpiece is increased and elongation deformation occurs, so that ordinary tops are not suitable for such turning. Therefore, we made reference to foreign information can be made of axial telescopic live tips, the following is as follows: Structure as the picture, the top (HSS, quenched HRC62 ~ 65) with C or D radial ball bearings, Enhanced load capacity. The top of the neck into the bearing inner ring, the tail of the long annular groove mounted needle roller, the middle with four 2.5mm thick (65mm steel, quenched HRC45 ~ 50) disc springs against the ball bearing end face, thus overcoming the bearing Clearance, to ensure the top stability and good accuracy. The outer diameter of the roller bearing and the outer diameter of the needle roller after assembly and the clearance of the top sleeve are controlled within the average clearance (including zero to zero) to ensure axial movement without rotation. When the workpiece deformation elongation, pushing the top, bearing, so that the disc