| 摘要 |
The calibration section (26) may be thought of as cylindrical, with two flats cut into its opposite sides. The cutting section (28), immediately above the calibration section, removes plastic from the pipe interior. This cutting section has an extent at least equaling the separation of the curved surfaces, and is relieved opposite the flats. The calibration section (26) may be thought of as cylindrical, with two flats cut into its opposite sides. The cutting section (28), immediately above the calibration section, removes plastic from the pipe interior. The cutting edge of the cutting section (28) lies parallel to the longitudinal axis (24) of the shaft. A deburring section (30) lies between the cutting section (28) and the top end (16) of the shaft. This trims the inner edge of the pipe end face. It has a second cutting edge (44) at an angle to the first, and projects over it. Preferred features: The first cutting edge in extension, would run to one of the curved surfaces of the calibration section. It is flush with the external curvature of the calibration section, or else projects beyond it. The cutting section has several cutting edges. It has two opposite cutting edges, with similar extent. The deburring section has similar combinations of cutting edges, which may be aligned with the first cutting edges. Each tool carries several groups, each comprising a calibration section, cutting section and deburring section, arranged in sequence along the shaft.
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