Chamfering apparatus for end faces of tubular members

Claim 1

Apparatus for simultaneously taper cutting the outer peripheral edge of the end face of a tubular member, taper cutting the inner peripheral edge of the same end face, and cutting the end face in a direction perpendicular to the axis of the tubular member, said apparatus comprising: (a) an abutment member (6); (b) first means comprising a telescopic hydraulic cylinder (11) for advancing said abutment member (6) into and retracting it away from a line of extension of the longitudinal axis of the tubular member (5) so as to prevent further axial movement of the tubular member (5) when said abutment member (6) is advanced; (c) a conveyor (4) for transporting the tubular member (5) toward the abutment member (6) and thrusting the tubular member (5) against the abutment member (6); (d) a chuck (14) provided between said abutment member (6) and said conveyor (4) for releasably holding the tubular member (5) in an axial position precisely defined by contact of the tubular member (5) against said abutment member (6); (e) a cutting tool (18) which is rotatable about and axially reciprocable along the longitudinal axis of the tubular member (5), the tip portion of said cutting tool (18) having an oblique cutting edge (46A) for taper cutting the inner peripheral edge of the end face of the tubular member (5), a straight cutting edge (46B) for cutting the segment of the end face of the tubular member (5) which is immediately adjacent to and radially outward of the inner peripheral edge of the end face of the tubular member (5) at a right angle to the longitudinal axis of the tubular member (5), and an oblique cutting edge (47A) for taper cutting the outer peripheral edge of the end face of the tubular member (5) radially outwardly of and immediately adjacent to the segment of the end face of the tubular member (5) cut by said straight cutting edge (46B); (f) second means (36, 38, 39) for rotating said cutting tool (18) around the longitudinal axis of the tubular member (5); (g) third means (24, 25, 26) for axially reciprocating said cutting tool (18) along the longitudinal axis of the tubular member (5) towards and away from said axial position precisely defined by contact of the tubular member (5) against said abutment member (6); (h) a linear guide (9) the axis of which is parallel to the axis of said telescopic hydraulic cylinder (11); and (i) fourth means (13, 13A) operatively connecting said telescopic hydraulic cylinder (11) to said linear guide (9) for slidably guiding the extension of said telescopic hydraulic cylinder (11).