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顿涅茨工艺设计研究所研制了一种可在任何角度上固定的车床刀架,如图所示。为了转动刀架11,揿下手柄8并作逆时针转动.此时,螺母9松开刀架,弹簧12使其上移。定位销2和4的轴肩被刀架阶梯孔托起并从圆锥凹槽14、15中退出。作用在手柄8上的压力使销子7进入孔6内,刀架就随着手柄可转动到所需要的角度。此时,弹性定位指针1紧贴在固定底座上的角度刻度盘16,指示出刀架回转的角度值。然后,抬起手柄8,使销子7从孔6中退出,顺时针转动螺母9。在其作用下,回转刀架降至固定的底座13上,定位销2和4在弹簧3和5的作用下,紧紧地贴在凹槽14和15的槽壁上。由于定位销呈圆锥形,环形槽的截面也呈圆锥形(与定位销的锥度相同,而分别为内外锥),销子2和4在弹簧的作用下,可在圆周的任何一点上插进凹槽(插进的深度取决于接触处的
The Donets Craft Institute has developed a lathe tool holder that can be fixed at any angle, as shown. To turn the tool holder 11, lower the handle 8 and turn counterclockwise, at which point the nut 9 releases the tool holder and the spring 12 moves it upward. The shoulders of the positioning pins 2 and 4 are supported by the holder stepped holes and retract from the conical grooves 14 and 15. The pressure on the handle 8 causes the pin 7 to enter the hole 6 and the knife holder can be rotated to the desired angle with the handle. At this moment, the elastic positioning pointer 1 is closely attached to the angle dial 16 on the fixed base, indicating the angle value of the rotation of the tool holder. Then, the handle 8 is lifted, the pin 7 is withdrawn from the hole 6, and the nut 9 is rotated clockwise. Under its action, the rotary knife holder is lowered onto the fixed base 13, and the positioning pins 2 and 4 tightly adhere to the groove walls of the grooves 14 and 15 by the springs 3 and 5. Since the locating pin is conical, the cross section of the annular groove is also conical (the taper of the locating pin is the same as the inner and outer cones, respectively). The pins 2 and 4 can be inserted at any point on the circumference by the spring Recess (depth of insertion depends on contact