DE1948452A1 - Jig - Google Patents

Description

DR.-JNQ. DIPL.-INQ. M. SC. DIPL.-PHYS. DR. DIPL.-PMYS. HÖGER - LEGAL RIGHT-GRIESSBACH - HAECKER PATENT LAWYERS IN STUTTGART

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Index-Werke KG, Hahn & Tessky 73 Esslingen / N., Plochinger Str. 92

Jig

The invention relates to a clamping device for clamping plague of a tool holder having a taper shank in a tool holder which has a tapered receptacle into which the The tapered shank of the tool holder can be pushed in by a pulling device is.

Tool holders with a tapered shank are usually designed as a tapered sleeve by means of a clamping element Tool carrier or clamped in a work spindle. So that the stiffness is sufficient and thus a vibration-free cutting force transmission is possible, must the taper angle of the holder and the tool carrier exactly Teaching be made. The surface lines of the cone shaft and the KegelhUlso need to match exactly to the whole cone, thus tilting the tool holder

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cutting force is avoided.

For the presetting of tools are described above Clamping principle to adhere to additional accuracy requirements. E.g. the tapered bore of the tool carrier and a corresponding conical bore of the presetting device can be manufactured so precisely that the tool holder in both holes occupies the same position. Since this is very difficult to achieve in terms of production technology, one often uses ^ a tapered sleeve with a shoulder. The tapered sleeve is inserted into a cylindrical bore in the tool carrier or the presetting device added and attached to the shoulder in the axial direction by screws. The axial position through the shoulder the conical bore is fixed, it is used as an adjustment element by reworking. The adjustment work must be carried out on both Presetting device, as well as at each tool station of the tool carrier made v / ground. Despite the compensation option described, different clamping forces and position differences of the tool cutting edges occur due to wear of the tapered sleeve.

The invention is now based on the object of a clamping device to create in which the manufacturing tolerances of both the cone diameter and the cone angle have no influence on the position of the preset tool cutting edges. This object is achieved according to the invention at the beginning mentioned clamping device solved in that in a cylindrical bore of the tool carrier-a slotted, with an inner conical surface. provided conical sleeve is displaceable and furthermore a contact surface of the tool holder arranged perpendicular to the axis against a corresponding as an

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Impact surface formed end face of the tool carrier can be pressed. With this construction there is once through the contact surface of the tool holder arranged perpendicular to the axis on the stop surface of the tool carrier a Perfect transverse position of this tool holder to the axis of the clamping device and thanks to the displaceable and expandable tapered sleeve there is a perfect pressing of the conical sleeve against the cylindrical bore of the tool carrier and thus perfect Centering of the entire tool holder. The tolerances of both the tapered surface of the tapered shank and the tapered ones Mounting of the tool carrier have no influence on the central tension, provided of course that the surfaces of the The conical sleeve itself are centric to one another. On the other hand, the slope tolerances of the conical surfaces, which are mutually exclusive, have an effect can never fully correspond to the centricity in no way unfavorable.

It is advantageous to set the slope tolerances so that the taper sleeve can have a flatter and the taper shank of the tool holder a steeper taper angle. this has the advantage that three centering always takes place on the large diameter of the conical surfaces, which creates transverse forces on the tool holder can be picked up by the tool carrier in the shortest possible way and with the best possible rigidity. Furthermore are Angular errors of the cone axes to the stop surfaces largely without influence on the centric position. Since the taper of the Tool holder has no alignment function, its load-bearing length can be kept shorter than usual.

It is advantageous if the tapered sleeve moves around a predetermined one Can move lengthways. This will be

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for example this ensures that in a recess the tapered sleeve engages a stop pin of the tool carrier

For this shift it is also significant that before inserting the tapered shank into the tapered sleeve between its cylindrical circumference and the cylindrical inner surface of the tool carrier there is no play and due to the inherent springiness of the slotted tapered sleeve there is already a certain amount of play radial pressing of the same against the cylindrical bore of the tool carrier is achieved. This pressure is when a. pushing the cone shaft against an axial spring preload of the cone sleeve and against the friction occurring on the cylindrical Bore increased so that safe centering and high rigidity across the axis is guaranteed.

The expansion effect of the tapered sleeve and the radial pretensioning that this creates causes the tapered sleeve to expand does not have to expand during the clamping process, which means Friction processes are avoided in the circumferential direction. This can prevent errors in the centering effect.

It is also beneficial if springs are provided that constantly try to move the tool holder into the release position, in such a way that when the pull-in force ceases, the tapered shank is now moved into its release position.

Further advantages and features of the invention emerge from the following description in connection with the drawing, which includes an embodiment of the invention. In the drawing show: ■ ~.

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Fig.l shows a longitudinal section through a tool holder receiving tool carrier,

Fig. 2 shows a cross section along line 2-2 of Fig.l.

With Io a tool carrier is designated as a whole, in which a tool holder 12 is to be clamped / grounded. The tool holder 12 has a Vferkjaeugblock 16, in which the actual tool 18 is attached by means not shown, and also a conical shaft 2o with a conical surface 22. In addition, a contact surface 2 ^ 4 is arranged perpendicular to the longitudinal axis of the conical shaft. The aforementioned tool carrier has a stop surface 76 formed perpendicular to the longitudinal axis and a cylindrical bore 3o in which a slotted conical sleeve 32 is arranged. The conical sleeve has a slot 3H and a hole 36 into which a stop pin 38 of the tool carrier protrudes with play, through which the longitudinal movement of the conical sleeve 32 is limited. Its conical inner surface is denoted by 7 H and its cylindrical outer surface is denoted by 72. At a distance according to Fig.l to the right of the conical sleeve, a support ring Ho is provided which engages in a corresponding annular recess of the tool carrier and is thus held in the axial direction. Between this support ring ¹ Jo and the rear surface of the conical sleeve 32 springs 42 are arranged, which try to move the conical sleeve to the left as in Fig.l. A bearing ring HH rests against the end face of the support ring on the right in FIG. 1 and is held in its axial position by a fixing screw HC. With the aid of a ball bearing H8 , a bevel gear rim 5o can now run on the race HH, which is held in its axial direction by a guide pin 52 of a guide screw 5H .

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A bevel gear 56 cooperates with the bevel gear rim 5o, whose bevel gear shaft 58 is mounted in the tool carrier and which can be rotated with the help of a polygon 60.

The bevel gear rim 5o has an internal thread that connects to the external thread a tension sleeve 62 cooperates, which has a driving ring groove 6 * 1, in which the clamping head 66 engages, the is attached to the rear end of the taper shank.

To fix the position of the tool holder in the circumferential direction, a driver 68 is attached to the tool carrier, which engages in a recess 7o of the tool block.

The procedure for tensioning the tensioning device is now as follows.

In the idle state, the springs k2 press the conical sleeve 32 into its left-hand position as shown in Pig.l with a stop against the stop pin 38. In addition, there is now a slight surface pressure between the cylinder bore 3o of the tool carrier and the circumference 72 of the conical sleeve due to its inherent springiness.

To clamp the tool holder, its tapered shank is inserted into the Taper sleeve inserted until the contact surface 2'4 of the

Tool holder against the stop surface 76 of the tool spring

the carrier. Thereby, the cone sleeve 32 / radially braced and expanded only by the minimum amount of radially adjusting Werkstoffzusammendrückung, so now the conical surface that the one part 22 of the taper shank 2o firmly against the conical surface 7 * 1 of the taper sleeve 32 and the cylindrical circumferential surface 72 firmly g ^e E ^e * v press the inner surface 3o of the hole. Due to the spring force of the conical sleeve, its wedge effect is used to create a corresponding

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Surface pressure between the tapered shank of the tool holder, to generate the tapered sleeve and the bore of the tool holder.

The inward pull on the tapered shank takes place in that the clamping head 66 engages in the driving groove 6Ί in a manner not shown by a pivoting movement of the tension sleeve 62 by 90 and the tension sleeve 62 is axially shifted to the right according to Pig. 1 by turning the bevel gear 56 a rotation of the bevel ring gear 5o takes place. This conical toothed ring now rotates concentrically and, through the threaded connection, takes the tension sleeve 62 with it to the right, as shown in FIG. 1, to clamp the plague.

The wedge angle of the sleeve can be in the self-locking area or larger. The spring force is then corresponding to choose. If the tool holder is designed with a standardized ISA steep taper, for example, the wedge angle corresponds to Sleeve half the steep taper angle and is therefore in the self-locking range. This corresponds to in the radial direction Force fit practically a form fit, whereby high transverse ^ · forces can be absorbed without the conical sleeve being able to give way axially.

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Claims (1)

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9/17/69 Pa t e η t a η s ρ r ü c h e Clamping device for clamping a tool holder with a Kggelschaft in a tool holder, which has a conical receptacle into which the tapered shaft of the tool holder can be inserted by a pulling device, characterized in that in a cylindrical bore (3o) of the tool holder (Ip) a slotted, with an inner conical surface (7 ¹ O provided conical sleeve (32) is movable and further including a vertically arranged to the axis contact surface (24) of the tool holder (12) can be pressed against an Unlock-computing stop surface. (76 of the tool carrier (LO). 2. Clamping device according to claim 1, characterized in that that the conical sleeve (32) is displaceable by a predetermined distance in the longitudinal direction. 3. Clamping device according to claim 1 or 2, characterized in that that springs (42) are provided, which move the conical sleeve (32) into the front end position, try. 4. Clamping device according to one of the preceding claims, characterized in that the taper angle of the taper sleeve (32) is slightly flatter than the taper angle of the taper shank (2o) of the tool holder (12). -S- A 37 631 h h - $ 137 9/17/69 5- clamping device according to one of the preceding claims, characterized in that the tapered sleeve (32) prior to tensioning by its own spring against the inner surface (3o) the bore of the tool carrier (lo) is in contact. 109814/1164 Blank page