DE3315720C2 - Device for clamping elongated, rotationally symmetrical workpieces - Google Patents

Abstract

The invention relates to a clamping device for clamping elongated, rotationally symmetrical, substantially cylindrical workpieces in a machine for processing the workpieces. In order to fully clamp workpieces, in particular pipes, over the entire circumference with simple clamping elements which are suitable for the transmission of higher clamping forces, it is proposed that a helically wound clamping element (1) surrounding the workpiece, one end of which is attached to an abutment (3) is attached and the other end is connected to a rotating device.

Description

I 3

$ j from the clamping element in the direction of the abutment 13 here

| i can be included. At both ends of the I; Tensioning element 11 is each a Dnrfiarm 14.15.

ii These rotating arms 14,15 clamp by turning in a wrench ·: - angle direction according to the arrows6,17 the clamping

p element 11 on the workpiece 12 firmly by turning

j, the rotating arms 14,15 opposite to the winding direction is the

£ clamping of the workpiece 12 so far released that Jiet axially transportable The arrangement of the rotating arms

; me 14, 15 in suitable rotating devices is not For a uniform contact of the inner surfaces of each turn 8 on the workpiece 12, it is advantageous here to when the inner diameter of a tensioning element brain relaxed state from both ends to the Is slightly conically narrowed towards the middle. Here, the smaller diameter is approximately in the middle of the clamping element 11 arranged

To a larger diameter range with a To capture clamping element 1, 11, it is only necessary to enlarge the inside diameter. This can be achieved in that the rotary arm 4 on the clamping element 1 or the rotating arms 14, 15 on the clamping element

; 11 can be rotated in the opposite direction to the winding.

1 sheet of drawings

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Claims (5)

1 2 den and clamping marks as well as moldings on the claims: workpieces are practically unavoidable. The main advantage of the inventively designed 1. Use of a clamping device with a permanent device consists in the fact that when a workpiece is wound over helically, high clamping forces act on a workpiece, one end of which is also not attached to a clamping impression on the workpiece and the other end of which is an abutment arise when this is a thin-walled hollow with a rotating device, to the chip body, in particular tubes with small wall thickness, nen elongated, rotationally symmetrical, in the w Clamping element one size tubes. ^rer diameter range can be clamped than before 2. Use of a clamping device with a can without damaging deformations on the helically wound a workpiece occur around the workpiece surface. This achieves benden clamping element, the two ends of which each with the fact that the cost of tools is significantly reduced Rotary device are connected, whereby an is can be used. End for the transmission of axial forces on a The invention is based on the accompanying drawings Abutment is rotatably mounted, explained in more detail below for clamping elongation elongated, rotationally symmetrical, essentially from the figures shows Chen cylindrical workpieces, especially pipes. Fig. 1 the clamping element arranged on a tube 3. Clamping device according to claim 1, characterized in part in section and otherwise in one side, that the inner diameter of the ent · view, wherein the clamping element on an abutment tensioned clamping element (1) fixed in the axial direction, shown in the relaxed state, F i g is slightly conically narrowed towards the abutment (3). 2 shows the arrangement of FIGS. 1, whereby the clamping 4. Clamping device according to claim 2, characterized in that the element is shown in the clamped state,
characterized in that the inner diameter of the 25 Fig.3 the image of Fig. 1 in an axial view relaxed clamping element (U) from both ends and F i g is slightly conically narrowed towards the center. 4 shows the illustration of FIG. 2 in an axial view 5. Clamping device according to one of the preceding- The clamping device according to Fig. 1 and 2 consists in the claims, characterized in that the essential of a helical around the work clamping element (1, 11) on the inside with a 30 piece twisted tensioning element 1, an abutment 3 Friction lining is provided and a rotary arm 4. The turns 8 of the tensioning element 1 advantageously have a rectangular transverse cut, creating a smooth, cylindrical inner surface The abutment 3 is attached to the machine frame (not shown). The invention relates to the use of a clamping nem end z. B. befeeinrichtung via an arm 5 on the abutment 3 with a helically wound, stigt At the other end, there is a rotary arm 4 on the clamping element Clamping elements surrounding the workpiece, as well as the ment! Fastened in such a way that the rotary arm with a not Training of the clamping device. shown rotating device in both directions In tool technology, machine spindles are 40 that can be rotated through a certain angle. Of the knows where the tool by means of a clamping arm 4 is opposite to the angular direction of the Schraurrichtung is held, which essentially consists of a tensioning element, arrow 6, wound in the shape of a ben line, screw-shaped winding, the tool is turned over, so that the clamping element 1 loosely on the Benden clamping element exist (DE-OS 25 43 661). The workpiece 2, in particular a pipe, is located in the If only part of the shank of the tool is in one position, the workpiece 2 can be in the clamping element 1 be pushed back and forth tensely. When the pivot arm is 4 in The object of the invention is to geke workpiece angular direction of the clamping element (arrow 9, FIG. 3), In particular, pipes are rotated over the entire circumference, their inner diameter is reduced, simple clamping elements that are used to transfer the turns 8 of the clamping element to the higher clamping forces are suitable to be fully clamped. 50 outer surface of the workpiece 2 pressed and thus This object is achieved according to the invention by the workpiece 2 in the axial direction against the to claims 1 or 2 specified features abutment 3 clamped solves. In the subclaims are further features for an even contact of the inner surface of each for the configuration of the Einrichtun winding 8 according to the invention on the workpiece 2 after the execution in the gen specified. 55 Fig. 1 and 3, it is advantageous if the inner passage In addition, devices are known with the knife of a tensioning element 1 in the relaxed state NEN elongated Wencstück can be clamped. Work conically from one end to the other serve as clamping elements bake in half or multi-shell form. With these arranged on the abutment 3, which can be achieved Clamping jaws are high clamping forces transferable, 60 can that when clamping a workpiece 2 first the however, a different turn 8 of the Spannele set beginning at the abutment 3 is used for each workpiece dimension Jaws required, whereby a very large element 1 is applied to the surface of the workpiece 2 Number of clamping jaws with different diameters and then the other turns 8 to knife and associated with it a large storage to the other end on the rotary arm 4, after which the force required is. There are already so-called prismatic, elastic tightening by further turning men and lamellar clamping jaws known, with which one of the rotary arm 4 takes place larger diameter can be detected; Here, According to Fig. 2 and 4, the clamping element 11 is on one However, if high clamping forces cannot be transmitted, abutment 13 is rotatably fastened, so that forces