Cutting unit, method of varying rake angle of cutting unit and method of assembling thereof

摘要

A cutting unit includes a detachable head assembly with a cutting insert and holder. The mating spherical surfaces in both parts helps to get freedom of movement, hence helps in getting different rake angles. A set of pins helps getting correct center height for the cutting insert when spherical surfaces of both parts are not in contact with each other. The pins when lifted up gives point contact with spherical surface of the head assembly. The pins are moved in the holes provided in the holder with the help of screw-nut principle. The head assembly is clamped against holder using a clamping ball mechanism. The clamping balls are free to rotate in their respective seating area. Rake angles are changed by turning the head assembly manually. Once the required rake is set, the clamping balls are fastened.

主权项

1. A cutting unit comprising:
a holder comprising a supporting block including a cut out at one end in one face; and a plurality of through holes at predetermined places on the cut out; a head assembly connected to said block, conforming to a shape of said cut out, said head assembly comprising an insert pocket to accommodate a cutting insert, and a through hole at its center for connecting with the holder; fastening means passing through the holes of the supporting block and head assembly; and a plurality of pins passing through the holes of the holder,wherein a position of said pins is varied to displace the head assembly to vary a rake angle of the cutting unit, andwherein the fastening means comprises a ball bolt comprising a threaded rod connected with a ball screw comprising a threaded ball head and a hexagonal protrusion.