DE1602749A1 - Clamping device with a clamping sleeve that can be changed in size - Google Patents

Description

Applicant: EMUGE-WSRK Richard Glimpel Factory for Precision Tools (formerly Moschkau & Glimpel)

Title:.

Clamping device with a clamping sleeve that can be changed in circumference

Description

The invention relates to a clamping device for holding. of a piece, preferably on a machine tool, with a base body having a central axis and a clamping sleeve which is provided coaxially to this and which can be changed in circumference, which on sleeve strips outer and inner contact surfaces for the base body or the piece, these contact surfaces having sleeve strips connecting sleeve strips and along the central axis has extending radial recesses, of which two adjacent ones each run at least partially at the same radial height. The piece is either a workpiece or a tool. There is provided coaxially with the main body "The collet is then partitioned between the base body and the piece along the central axis displaceable and fes-tiegbar _s wherein the Anlägeflächen für.den base body on the base body and

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the contact surfaces for the piece are in contact with one another «,

Two recesses running at least partially at the same radial height overlap one another in the radial direction,

In one of the Swiss patent 337 057 known clamping device of this type has the clamping sleeve sleeve strips, which are both the contact surfaces for the Have base body as well as the Änlageflachen for the piece. In each case between two adjacent sleeve strips with contact surfaces is a spread over a large part of the Sleeve length in the direction of the central axis extending slot and the slot continuing, the two be_ adjacent sleeve strips connecting sleeve strips provided. In such a clamping sleeve, the circumference of which can be changed due to slots, move for a change in the circumference of two adjacent sleeve strips with surfaces for the base body and the piece only in the area of the slots against each other »This is disadvantageous, because it is the extent of the clamping effect or the clamping accuracy reduces »Dirt particles also occur disadvantageously through the slots in the adapter sleeve. An adapter sleeve, the circumference of which can be changed due to slots is the one mentioned at the beginning, especially in the case of a clamping device Kind of disadvantageous in which the sleeve strip with contact surfaces for a base body and the base body with several lying one behind the other in the direction of the central axis

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the teeth, which each have a plank that is sloping and flat, cellar-like, on the central axis. interlocking »With such a clamping device, L " Ovvohl positions of the clamping sleeve in relation to the base body occur; the gap, only partially covered .. If dirt particles get through the .: slits of the. 3} aLijh: If there is an empty space between two teeth of the base body, the accuracy of the position in which the space between the tooth and the clamping sleeve should be filled is impaired. The advantageous serviceability of the tensioning device suffers from this aurci: the slots in the tensioning sleeve: conditional part of the compartment. · "" ■. "-. ';' ^.:

An object of the invention is to provide a Spamihülse ". Provide that none of the Terä.rxäe-rharkeit its periphery" to "comprising serving slots and their Änlageflachen aufweic-ENAE-Hülsenstreixen at o ^e d: ^he ER- place of their longitudinal "Stretching in -Licht der IvIit te lach se miteinanöer connected to be known ^ The invention reads this task"c; with a chipP device: of the type mentioned at the beginning, which is characterized by the fact that the two adjacent recesses "■". An inner groove-like recess and an outer groove-like recess are »- .. ·" ..- ". ^: .

When changing the scope of an inventive / ^;

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The connecting sleeve strips either move in the clamping sleeve in the direction of an approach or an increased deviation from the course of those formed by the abutment patches Lateral surfaces, with you to the circumference of the adapter sleeve contributing part and thus the scope of the adapter sleeve So changed a clamping sleeve according to the invention when clamping of a piece withstands high stresses, the invention also provides that an inner and an outer contact surface have in common at least one central plane running along and through the central axis.

A preferred embodiment of the clamping device according to the invention occurs when the sleeve strips with the abutment surfaces for the base body and the base body with several lying one behind the other in the direction of the central axis Teeth which each have one inclined to the central axis and have flat wedge-like rising plank, interlock, wherein the teeth of the base body extend around its entire circumference, and if further the Length of the connecting sleeve strips in the direction of the central axis equal to the length of the sleeve strip with the contact surfaces for the body and for the piece.

Because of the teeth, which each have a plank inclined to the central axis, those on such a plank are Clamping sleeve in the event of a change in its circumference Deformation forces along the central axis largely equal »

The clamping accuracy possible as a result is neither impaired that the sleeve strips move "with the contact surfaces only in the area of slots against each other", still in that through slots dirt particles between Clamping sleeve and base body arrive. With regard to the manufacture of the clamping device according to the invention, it is advantageous if seen in the circumferential direction, in each case next to a sleeve strip, which has only one contact surface for the örundkörper, a sleeve strip 'that only has a contact surface for the piece is provided and the distance between the "two sleeve strips" from the central axis is different.

Embodiments are described below with the aid of the drawing the clamping device according to the invention described in more detail. In the drawing shows ■■; . '' ..

Fig. 1 is a view with parts of a clamping device, fig. 2 shows a section along line H-II of Pig. 3 » Figo 3 is a front view of a particularly preferred one.

Adapter sleeve,

Fig. 4 shows a section along line IV-IV of Figo 5>. FIG. 5 shows a front view of a further clamping sleeve, FIG. 6 shows a section through a further clamping device

and
Fig. 7 is a front view of a third clamping sleeve "

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The jig according to Pig. 1 is used as a top mandrel formed and has a base body 1, which is a full piece and circular in cross section. An adapter sleeve 2 is pushed onto the base body 1 and protrudes beyond the G-round body on both sides. A grub screw screwed into the base body 1 protrudes into an opening in the clamping sleeve 2, whose width in the direction of the central axis is greater than the diameter ■ of the grub screw and moving the Allows clamping sleeve in the direction of the central axis. A pin 3 connected to the base body 1 protrudes on one side, which has a common central axis with the main body, from the clamping sleeve 2. A nut 4 screwed onto the pin 3 presses one on one of the two end faces the clamping sleeve 2 adjacent washer 5 against the clamping sleeve.

The clamping device according to FIG. 6, on the other hand, is used as a chuck formed and has a base body 1, which is a hollow Piece is, and the cavity is circular in cross section. A clamping sleeve 2 is pushed into the base body 1 and protrudes from this one end. One, through the main body 1 screwed grub screw protrudes into a recess in the clamping sleeve 2, the width of which is in the direction of the central axis is larger than the diameter of the grub screw. A nut 4 screwed onto the base body 1 on the outside pulls it an annular disc resting against the protruding end face of the clamping sleeve 2 and rigidly connected to the nut

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5 against the adapter sleeve.

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Each of the illustrated clamping sleeves 2 is in cross section; circular and "has several looking towards their" central axis extending sleeve strip 6 with contact surfaces 14- for one ΰ-round body and contact surfaces 15 for one piece. With the clamping sleeves 2 according to Mg. 1 to 5 are the contact surfaces 14 for a basic body inner -layer surfaces against which they "both" Srannhüloen according to Pig. 6 and 7 are outer contact surfaces. The contact surfaces 15 are correspondingly for one piece at the Clamping sleeves 2 according to Pig. 1 to 5 external contact areas and for the adapter sleeves according to Pig. 6 and 7 inner contact surfaces «\ In each pail are the inner and outer appendages ~ surfaces each in a common cylindrical jacket

In each clamping sleeve 2, each sleeve strip 6, with a contact surface 14 for a base body, has several teeth 10 one behind the other in the direction of the central axis; in
In the direction of the central axis, one tooth 10 follows the other.
Each tooth 10 extends in the direction of the circumference of the clamping sleeve 2 over the entire sleeve strip 6. The teeth 10 oil in total the contact surface 14 for a basic "
body. Each tooth 10 has a steep plank on one side and a flat wedge-like rising plank on the other side, viewed in the direction of the litteiaehse.

According to Pig. 1 and 6 has the base body 1 on its
outer or inner lateral surface of teeth 9, which are adapted to the teeth 10 of the clamping sleeve 2 and as endless grooves

: .- ■■ = "■■ '. ■ ■■ - ■'. ■ ''. '" .. -8-

or thread around the circumference of the base body. the flat wedge-like inclined plank of the teeth 9 of the base body 1 is the ring disk that works together with the cutter 4 5 facing. If the nut 4 is rotated in one direction of rotation in the two clamping devices, it shifts they place the clamping sleeve 2 on the base body 1 according to their direction of rotation along the central axis of the base body. Of the The circumference of the clamping sleeve 2 is here widened in the case of the clamping mandrel according to FIG Fig. 6 is reduced.

With each clamping sleeve 2, two adjacent sleeve strips 6 provided with contact surfaces 14j 15 are each over one connecting sleeve strip 8 connected, the length of which in The direction of the central axis is the same as that of the sleeve strips with attachment surfaces. The clamping sleeve 2 consists of the sleeve strips 6 with contact surfaces and the connecting sleeve strips 8, is made of metal and is elastic. In the clamping sleeve 2 according to FIGS. 2 and 3, the connecting Sleeve strips 8 with their width radially extending webs, in the case of FIGS. 4 and 5 with its width along a Secant webs and, in the case of the channels according to FIG. 7 with their opening facing the central axis, of constant thickness.

With each clamping sleeve 2, each connecting sleeve strip represents 8 a partition between an inner nutarti-

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gen recess 12 and an outer groove-like recess 15. In the case of the clamping sleeve according to Mg »3" - the groove-like recesses 12, 13 are rectangular in cross section, the outer recesses 12 being smaller than the inner recesses 13. The groove-like recesses "in Clamping sleeves 2 according to Mg ₀ 5 'are partially circular in cross-section, the radius of the outer depression 13 being greater than that of the inner depressions 12. Finally, in the case of the clamping sleeve 2 according to I ¹ Ig ₀ 7, the cross section of each inner recess 12 is a semicircle within one of the connecting sleeve strips designed as a channel. enclose connecting sleeve strips 8 formed as a channel from the outside.

In the case of the adapter sleeves 2 according to Hg «3 and 5 is next to , a sleeve strip 6 with a contact surface 14 for a G-round body a sleeve strip 6 with a contact surface early a piece provided, the distance between the two Sleeve strip 6 is different from the central axis. In the case of deiföpann sleeve 2 according to Hg. 7, sleeve strips 6 on the one hand Contact surfaces 15 for one piece and on the other hand for a G-round body on «In any case, the clamping sleeves 2 designed so that a central plane along and through the central axis both an inner contact surface as. also at least touches an outer contact surface. These center planes run in the case of the clamping sleeve 2 as shown in FIG. 3

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almost right through the connecting sleeve strips 8, in the case of the clamping sleeve according to Pig. 5 approximately diagonally through the connecting sleeve strips and, in the case of the clamping sleeve 2 according to FIG. 7, approximately through the middle of the sleeve strips S _{0 having the contact surfaces}

In the case of the clamping sleeve 2 according to Pig "3, the maximum width is the outer groove-like depressions 13 many times smaller than that of the inner groove-like depressions 12 and that of the outer contact surfaces 15 for the piece. A very large part of the outer jacket surface of this clamping sleeve 2 is therefore effective contact surface. The width of the inner groove-like Depressions 12 is approximately equal to the width of the inner contact surfaces, The latter is also the case with the clamping sleeves 2 according to Pig. 5 and 7 of the pail. With the clamping sleeve 2 according to I'ig. 5 is also the maximum width of the outer groove-like depressions 13 approximately equal to the width of the outer contact surfaces. In the case of the clamping sleeve 2 according to Pig. 7 go each two outer depressions 13 one inside the other and is omitted width only 2/3 of the outer circumference of the clamping sleeve of external contact surfaces,

In the illustrated clamping sleeves 2 is an inner one groove-like recess 12 of an outer groove-like recess 13 adjacent. The two recesses 12, 13 extend extend over the entire length of the clamping sleeve 2 and as far as their radial depth is concerned, only partially, namely with their overlapping areas, on the same level

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radial "heightc Thus each runs around the central axis of the Clamping sleeve placed circle, the radius of which is a value between the radius of the inner contact surfaces and that of the outer Has contact surfaces, either-through the inner depressions 12 or through the outer groove-like depressions 13. None this circle runs entirely in sleeve strips 6, 8, the In the material of the clamping sleeve is called 2.

In the case of the clamping sleeve 2 according to FIG. 5, the groove-like depressions 12, 13 run only slightly at the same radial height, ie they only overlap slightly. The groove-like depressions of the clamping sleeve '2 according to FIG. 5, on the other hand, are more than a third of their depth and those of the clamping sleeve according to Pig. 3 with more than half of its depth at the same radial height *,

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Claims (1)

Claims Clamping device for holding a piece with a base body having a central axis and a clamping sleeve which is provided coaxially to this and which is variable in circumference and which on sleeve strips has outer and inner contact surfaces for the base body or the piece, sleeve strips connecting these contact surfaces and sleeve strips running along the central axis of which two adjacent ones each run at least partially at the same radial height, characterized in that the two adjacent recesses are an inner groove-like depression (12) and an outer groove-like depression (13). - 2ο Clamping device according to claim 1, characterized in that an inner and an outer contact surface have in common at least one central plane running along and through the central axis. Clamping device according to Claim 1 or 2, characterized in that, viewed in the circumferential direction, in addition to a sleeve strip (6) with a contact surface (14) for the G-round body, a sleeve strip (6) with a contact surface (15) fi ^; r the piece provided and the distance between the two sleeve strips from the central axis is different, * -13- 109833/0314 Refrain from t * »v7§TAfcv2; ^ * ^ 42i & siÄr» cieruna3o-3e.v.4.9 BAD 4. Clamping device according to claim 1 or 2, characterized in that each of the sleeve strips (6) with abutment ~ surface has both an outer and an inner abutment surface and each of the connecting sleeve strips (8) / curved channel-like with approximately the same thickness isto 5ο clamping device according to one of the preceding claims, characterized in that the length of the connecting sleeve strips (8) in the direction of the central axis is the same as that of the sleeve strips (6) with the contact surfaces (14, 15) for the base body and the piece » 6. Clamping device according to one of the preceding claims, characterized in that the sleeve strips (6) with the contact surfaces (14) for the base body and the base . body (1) with several in the direction of the central axis one behind the other Teeth (9, 10) each of which is inclined to the central axis and rises in a flat wedge-like manner Have flanks, interlock. 7, clamping device according to claim 6, ' characterized in that the teeth (9) of the base body (1) extend around its entire "circumference. BAD ORiGfNAL