Patent ID: 11897058
Assignee: HYUNDAI ROBOTICS CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 2:
3. The weld groove forming method of claim 2, wherein the step (S120) comprises:
(S120-1) slantly cutting the outer wall of the pipe from a first point far from the side end of the pipe to a second point close to the side end of the pipe, so that a thickness at the first point far from the side end of the pipe is thick, and a thickness at the second point close to the side end of the pipe is thin;
(S120-2) slantly cutting the outer wall of the pipe which went through the step (S120-1) from the second point far from the side end of the pipe to a third point close to the side end of the pipe, so that a thickness at the second point far from the side end of the pipe is thick, and a thickness at the third point close to the side end of the pipe is relatively thin;
(S120-3) slantly cutting the outer wall of the pipe which went through the step (S120-2) from the third point far from the side end of the pipe to a fourth point close to the side end of the pipe, so that a thickness at the third point far from the side end of the pipe is thick, and a thickness at the fourth point close to the side end of the pipe is thin;
(S120-4) cutting the outer wall of the pipe which went through the step (S120-3) from the fourth point close to the side end of the pipe to the side end of the pipe, so that a thickness is constant from the fourth point close to the side end of the pipe to the side end of the pipe;
(S120-5) vertically cutting the side end of the pipe which went through the step (S120-4) by a predetermined thickness;
(S120-6) cutting the inner wall of the pipe which went through the step (S120-5) from the side end of the pipe to a fifth point spaced apart from the side end of the pipe, so that a thickness is constant from the side end of the pipe to the fifth point spaced apart from the side end of the pipe; and
(S120-7) slantly cutting the inner wall of the pipe which went through the step (S120-6) from the fifth point close to the side end of the pipe to a sixth point far from the side end of the pipe, so that a thickness at the fifth point close to the side end of the pipe is thin, and a thickness at the sixth point far from the side end of the pipe is thick.