DE3116366A1 - CHUCK - Google Patents

Description

The invention relates to a chuck according to the preamble of the patent claim.

It is known that elongated workpieces such as pipes and the like are used on lathes for end machining stretched with a front and a rear end chuck. For pipes with a precise internal thread, e.g. for oilfield pipes, is a precise and stable clamping required. It has been found that this requirement so far only this could be achieved by first machining the outer diameter and then re-clamping The internal machining could be carried out in a second lathe. For this purpose, the already processed outer surface used for tensioning.

The object of the invention is to create a chuck with which a vibration-free machining of the pipe ends is achieved outside and inside with one clamping process.

To solve this problem, a chuck is proposed according to the invention, as described in the patent claim is.

With the help of the chuck according to the invention, an exact, precise machining of the pipe ends and the Thread without reclamping on a second lathe possible.

Errors that can occur due to double clamping are avoided. Furthermore, the processing time considerably shortened. In the accompanying drawings is a possible embodiment of the invention Chuck shown schematically.

Show it:

Figure 1 is a front view of the chuck

FIG. 2 shows a side view in section through FIG. 1.

As can be seen from Figure 1, the inner jaws are 2 arranged in the chuck 1 in a known manner. Offset to this are at least two outer ones Clamping jaws 3 arranged in such a way that they protrude axially beyond the inner clamping jaws 2 (based on the axis of the chuck).

When using the chuck according to the invention, the tube 4 with a front and rear end chuck in clamped in the lathe. In this tension, the pipe end is machined on the outside to the desired length. Without reclamping, the outer clamping jaws 3 then attack the machined surface. This means, the outer jaws 3 must axially protrude beyond the inner jaws 2 so that a proper Fit of the clamping jaws on the machined surface is guaranteed. In the subsequent Machining of the end face and the inside of the pipe, e.g. thread cutting, the pipe end is free from vibrations, so that precise machining can be carried out in one clamping.

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Claims (1)

PATENT AGENCY OFFICE PATENTANWÄLTE DIPL-ING. W. MEISSNER (1980) DIPL-ING. P. E. MEISSNER DIPL-ING. H.-J. PRESTING Approved representatives before the European Patent Office -Professional Representatives before the European Patent Office Your reference Your letter from Our reference HERBERTSTR. 22.1000 BERLIN 33 M / Go. 21 360 April 16, 1981 Mannesmann AG
Mannesmannufer 2
4000 Düsseldorf 1 Chucks Claim t Chuck with three jointly radially adjustable clamping jaws (2) for internal and external machining of pipe ends on a lathe, characterized in that at least two further separately arranged, radially jointly adjustable clamping jaws (3) are provided which Axially via the clamping jaws (2) -related to the chuck axis- protrude. TELEX: TELEGRAM: PHONE: BANK ACCOUNT: CHECK ACCOUNT 1-85644 INVENTION BERLIN BERLINERBANKAG. P MEISSNER BLN-W In the ion rl RCQl IM RED! IN OI