Cutters – for shaping – Rotary cutting tool – Gang
Patent
1998-02-02
2000-10-10
Rada, Rinaldi I.
Cutters, for shaping
Rotary cutting tool
Gang
83 54, 30 97, B23D 4512, B26D 1100
Patent
active
061294888
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention pertains to a device for cutting and chamfering pipes.
BACKGROUND
A device for cutting pipes is known from CH 568,117. In this case, a driving motor with a saw blade is advanced by means of an eccentric arrangement of different rings. Subsequently, the driving motor with the saw blade is manually guided around the pipe such that said pipe is cut. The pipe is centered and held in a vise by means of two V-shaped clamping jaws.
When welding a pipe to another pipe by means of an automated orbital welding process, an exact and uniform chamfer must be produced on both pipe ends. Otherwise, the welding process cannot be carried out correctly. This means that the pipe must be chamfered in one additional processing step after it has been cut.
For this purpose, the aforementioned device is equipped with an auxiliary milling cutter. This auxiliary milling cutter is arranged directly adjacent to the saw blade. The driving motor with the saw blade and the auxiliary milling cutter is guided around the stationary pipe once such that the pipe is simultaneously cut and chamfered.
One disadvantage of this device is that an exact chamfer cannot be produced in thin-walled pipes with large diameters because the clamping jaws of the pipe receptacle only accommodate the pipe in pointwise fashion. This means that the thin-walled pipe is clamped in the vise off-center during the clamping process.
Another problem of the aforementioned device is that the auxiliary milling cutter is very susceptible to wear on its front edge, i.e., the outer edge of the auxiliary milling cutter.
The pipe end also must be chamfered if a press fitting with a rubber ring seal is attached. These press fittings are used for connecting two thin-walled pipes of special steel in drinking water installations. In this case, two different chamfers are produced on the pipe ends, i.e., a steep chamfer for attaching and centering the press fitting onto the pipe and a flat chamfer.
SUMMARY OF THE INVENTION
The invention is based on the objective of developing a device for cutting and chamfering pipes which makes it possible to cut and exactly chamfer thin-walled pipes.
The advantage of the invention is that thin-walled pipes can be pressed into a round shape, cut and correspondingly chamfered in one processing step.
Due to the special design of the saw blade, the milling cutter has a significantly longer service life.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in detail below with reference to the Figures. Shown are:
FIG. 1, a side view of a device for cutting and chamfering pipes according to the invention with a clamping device and a machine tool unit;
FIG. 2a, a top view of the partially sectioned clamping device;
FIG. 2b is a view of a clamping jaw;
FIG. 3, a top view of the machine tool unit;
FIG. 4, an enlarged representation of the tools shown in FIG. 1, and
FIG. 5, a top view of FIG. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The Figures show a device for cutting and chamfering pipes. This device consists of a clamping device 1 and a machine tool unit 2.
FIGS. 2a and 2b show that the clamping device 1 consists of a vise 3. The holders 5 and 6 for the clamping jaws can be displaced relative to one another by means of a spindle 4. Clamping jaws 7 and 8 are rigidly connected to the respective clamping jaw holders 5 and 6. The clamping jaws have a semicircular inner surface 9 that adjoins the outer surface of a pipe 10 during the clamping process. When clamping a thin-walled pipe, oval sections of the pipe are compensated for by the clamping jaws.
When processing pipes of different diameters, the clamping jaws must be replaced with other clamping jaws with a semicircular inner surface that corresponds to the outer surface of the respective pipe. This replacement is realized by loosening the screws 11 that serve for fixing the clamping jaws to the clamping jaw holders. In addition, other solutions may be considered for attaching the clamping jaws, e.g., the utilization of a quick-actio
REFERENCES:
patent: 2411784 (1946-11-01), Goldsmith
patent: 3088352 (1963-05-01), Tanner
patent: 3431646 (1969-03-01), Young
patent: 3839791 (1974-10-01), Feamster, III
patent: 3974562 (1976-08-01), Wuchner
patent: 4171926 (1979-10-01), Dusza
patent: 4490909 (1985-01-01), Wachs et al.
patent: 4625464 (1986-12-01), Kubo
patent: 4641562 (1987-02-01), Clarke
patent: 5349751 (1994-09-01), Fahr
Georg Fischer Rohrverbindungstechnik
Goodman Charles
Rada Rinaldi I.
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