Tool unit with eccentric clamping device

Abstract

Tool assembly with at least one driven spindle (80) arranged in a housing (10), wherein the spindle (80) has a tool holder (91) with an integrated eccentric clamping device (150), wherein the eccentric clamping device (150) has an eccentric shaft (151) which carries an actuating adapter (152) at at least one end, wherein a segment collet (120) is arranged in the spindle (80) for clamping a tool in the tool holder (91) and is operatively connected to the eccentric clamping device (150), wherein an actuating assembly (40) with at least one retaining element (41), at least one actuating element (51) and at least one return spring (78) is arranged in the housing (10), - wherein the actuating element (51) has an end structure (66) located inside the housing (26) which - when the spindle (80) is stationary - is suitable for coupling to the actuating adapter (152), characterized in that - that the actuating element (51) is mounted in the housing (10) and / or in the retaining element (41) so as to pivot and move longitudinally the eccentric shaft (151) between two fixed positions between loosening and clamping, - that the pivot axis (75) of the eccentric shaft (151) lies at least approximately in a plane (29) in which the center line (59) of the actuating element (51) also lies, - that a definable elasticity is built into the segment collet (120), - that in a clamping bolt (121) of the segment collet (120) a recess (126) oriented parallel to an eccentric recess (124) is incorporated below a wall (125) of the eccentric recess (124), so that an elastic web (127) is located between the eccentric recess (124) and the recess (126).

Description

[0001] The invention relates to a tool unit with at least one drivable spindle arranged in a housing, wherein the spindle has a tool holder with an integrated eccentric clamping device and wherein the eccentric clamping device has an eccentric shaft which carries an actuating adapter at at least one end.

[0002] DE 102 41 860 A1 discloses an eccentric clamp for clamping hollow-shank taper tools. The eccentric clamp is arranged transversely within a rotating spindle, allowing the tool to be held by the spindle to be drawn into a corresponding tool recess by means of a clamping bolt. To increase the eccentric clamping force, the eccentric of the eccentric clamp acts on the clamping bolt via a toggle lever.

[0003] The present invention is based on the problem of developing a tool unit which has a spindle with a tool holder which can be actuated via an eccentric clamp, wherein the device for tool clamping is characterized by simple and safe handling with a high repeat accuracy with regard to the tool positioning.

[0004] The problem is solved by the features of claim 1, claim 7, and claim 8. For this purpose, an actuating assembly comprising at least one retaining element, at least one actuating element, and at least one return spring is arranged in the housing. The actuating element is pivotally and longitudinally displaceably mounted in the housing and / or the retaining element. The pivot axis of the eccentric shaft lies at least approximately in a plane in which the center line of the actuating element also lies. The actuating element has a front structure located inside the housing, which—when the spindle is stationary—is suitable for coupling to the actuating adapter.

[0005] The invention provides a tool unit in which a spindle mounted in a housing has a tool holder at its front end, in which the tool used can be held and clamped with repeatable accuracy by means of an eccentric clamping device, e.g., in combination with a segment collet. The eccentric clamping device has an eccentric shaft mounted in the spindle, which is controlled through the housing to actuate the segment collet. For this purpose, a special actuating assembly is arranged in the wall of the housing. The actuating assembly has an actuating element that is operated, e.g., manually using a screwdriver or mechanically using a suitable handling device.

[0006] The present embodiment describes a tool unit with only one spindle. Of course, the following explanations also apply to angle units or other multi-spindle designs.

[0007] Further details of the invention emerge from the subclaims and the following descriptions of schematically illustrated embodiments. Fig. 1: Perspective view of a tool unit; Fig. 2: how Fig. 1; but pivoted by 90° around the longitudinal axis; Fig. 3: Longitudinal section of Fig. 1; Fig. 4: Cross section to Fig. 1; Fig. 5: Partial longitudinal section of Fig. 2; Fig. 6: Segment collet with eccentric shaft in the position as it is in the tool unit after Fig. 2 is installed; Fig. 7: Eccentric shaft after Fig. 6, but pivoted by 90 degrees around the vertical axis; Fig. 8: Section of the eccentric shaft arranged in the eccentric recess with the segment collet open Fig. 9: how Fig. 8, but the eccentric shaft is pivoted counterclockwise by approximately 29°; Fig. 10: how Fig. 9, but the eccentric shaft is pivoted counterclockwise by approximately 45°; Fig. 11: how Fig. 10, but the eccentric shaft is pivoted counterclockwise by approximately 104°; Fig. 12: Exploded view of the actuation assembly.

[0008] The Fig. 1 and Fig. 2 show a tool unit, e.g., a drilling and milling head, in two views. A spindle (80) is mounted in the housing (10) of the tool unit, which spindle has a so-called "Capto" interface (91). A segment collet (120) is arranged in the spindle (80) to clamp a tool in this interface (91), see FIG. Fig. 6 and Fig. 7, which is operatively connected to an eccentric clamping device (150). The eccentric shaft (151) of this eccentric clamping device (150) can be actuated by means of an actuating element (51) of an actuating assembly (40) mounted in the housing (10).

[0009] The one-piece housing (10), for example, consists of a substantially cuboid-shaped front housing section (11) and a substantially cylindrical rear housing receptacle (31). The housing (10) has a continuous stepped bore (14). Its center line (15) is congruent with the center line of the rear housing receptacle (31). In the front section (16) of the stepped bore (14), two shoulder ball bearings (17) are arranged in an O arrangement and are axially fixed between a housing collar (18) and a housing cover (35). The housing cover (35) is centered on the outer ring of the front, protruding shoulder ball bearing (17). The stepped bore (14) narrows in the area of ​​the rear housing receptacle (31). There is an inwardly projecting housing web (19) against which a needle bearing (21) arranged in the central area of ​​the housing receptacle (31) rests with its outer ring.In the rear area, the housing receptacle (31) has an inner ring groove (22) which serves as a free space for the locking lug (182) of a positioning coupling (180).

[0010] The front part of the housing (11) has on its operating side (12) a stepped transverse bore (23) which opens into the central stepped bore (14), cf. Fig. 2, Fig. 3 and Fig. 4. It accommodates the actuating assembly (40). Its centerline (24) intersects, for example, the centerline (15). Two threaded holes (25) with cylindrical counterbores are located at equal distances on either side of the transverse hole (23). The centerlines of the threaded holes (25) lie with the centerline (24) of the transverse hole (23) in a plane perpendicular to the centerline (15).

[0011] For example, two coolant and / or lubricant paths are arranged in the housing front section (11). One path carries the coolant and / or lubricant, for example via an external angle connection (38) through a longitudinal housing bore (27) to a swivel ball adapter (39), which usually supports an external coolant pipe. The second path has a bore on the housing side in the rear end face (13) of the housing front section (11), which opens into the housing interior (26) via a cross bore between the front shoulder ball bearings (17) and the rear needle bearing (21). The further coolant and / or lubricant flow, which enables, for example, internal tool cooling, takes place in the spindle (80).

[0012] The rear housing receptacle (31) has a flattened portion (33) which, in some areas, has a straight serration of a VDI cylindrical shank according to DIN 69880. The receptacle, which serves as an interface to the machine tool or to its slide or turret, can be replaced, among other things, by a prism according to DIN 69881, by an HSK shank according to DIN 69893 or the like.

[0013] The rear end face (32) of the housing receptacle (31) has, for example, a radially oriented rectangular groove (34) which connects the VDI cylinder shaft outer side with the stepped bore (14), cf. Fig. 2 and Fig. 3.

[0014] The two-part spindle (80), for example, is mounted in the rolling bearings (17, 21) in the stepped bore (14). It consists of a front receiving part (81) and a coupling shaft (111). To accommodate the inner rings of the shoulder ball bearings (17), the receiving part (81) has a bearing section (83) in the front area, which ends in a shaft collar (85) in its rear area and in an external thread (84) in the front area. A shaft nut (101) is screwed onto the external thread (84) and clamps the inner rings of the shoulder ball bearings (17) axially against the shaft collar (85). The shaft nut (101) has a cylindrical, finely machined, radial outer surface against which a lip sealing ring (36) arranged between the housing cover (35) and the shaft nut (101) rests with its sealing lip.The front area of ​​the shaft nut (101) has a wraparound portion (102) to form an additional labyrinth seal (37), which wraps around a sealing web projecting forward from the housing cover (35) on two radial surfaces and one axial surface with slight play.

[0015] The needle bearing (21) is seated with its inner ring in the area of ​​the assembly joint (117) located between the receiving part (81) and the coupling shaft (111). To form a torque-transmitting assembly joint (117), the receiving part (81) has a tab (99) on its rear end face, which projects into a corresponding groove (114) in the front end of the coupling shaft (111). The inner ring of the needle bearing (21), which centers the coupling shaft (111) on the receiving part (81), is clamped without play between a collar (86) of the receiving part (81) and a collar web (113) of the coupling shaft (111) by means of a cylinder head screw (116). The coupling shaft (111) has a serration (112) at its rear end. Via this serration, the torque of the drive rotation of the machine tool is transmitted to the spindle (80) of the tool unit.

[0016] The receiving part (81) has a central tool recess (91) adjacent to the flat, finely machined end face (82) and serving as a tool holder. The recess consists of an interface recess (92), a support ring seat (93), and an eccentric bore (95). The diameters of the three consecutive regions (92, 93, 95) of the tool recess (91) decrease with increasing distance from the end face (82), so that the eccentric bore (95) has the smallest diameter of, for example, 24 mm.

[0017] The interface recess (92) is, for example, a polygonal hollow cone, as described in the draft standard ISO / DIS 26623-2 for several dimension types. At least for some of these interface dimension types, a designation has meanwhile become established, which consists of a "C" and the first digit of the usable end face diameter "d1". The tool unit shown in the figures shows, at least in the Fig. 3 and Fig. 5 in original size the interface dimension type “C4”, where “d1” here measures 40 mm.

[0018] The eccentric chamber bore (95), in which the clamping bolt (121), which clamps the corresponding tool in the holding segment collet (120), is centered, has a continuous, multi-stepped transverse bore (96). This transverse bore (96) is oriented, for example, transversely to the center line (15). For example, its center line (75) intersects the center line (15). The part of the transverse bore (96) with a smaller minimum cross-section has an annular land (97) with a smaller bore cross-section than the bore areas located in front of and behind the annular land (97), see. Fig. 3.

[0019] Between the interface recess (92) and the eccentric chamber bore (95) there is the e.g. cylindrical support ring seat (93), which has an annular groove towards the interface recess (92) for receiving a retaining ring (149).

[0020] The receiving part (81) has one or more transverse or oblique bores in the rear area, which connect the housing interior (26) to the tool recess (91) for guiding a coolant and / or lubricant that can be discharged on the tool side.

[0021] After the Fig. 3 and Fig. 5, the clamping bolt (121) is located in the tool recess (91) of the receiving part (81) and is longitudinally displaceable by means of the eccentric shaft (151). The clamping bolt (121), see also Fig. 6, the central part of the segment collet (120) is, for example, a rotary part with a guide section (123), a waist section (131), and an expansion section (133). The rear part of the clamping bolt (121), the guide section (123), sits with slight play in the cylindrical eccentric bore (95).

[0022] The guide section (123) has a central transverse eccentric recess (124), cf. Fig. 5, which is penetrated by the eccentric shaft (151). The eccentric recess (124) has a substantially rectangular cross-section. The cross-sectional corners are rounded. The longer, straight edges of the rectangular cross-section are Fig. 5 cut from the spindle center line (15).

[0023] Between the rear end face of the clamping bolt (121) which is chamfered at an angle of 45 degrees and the eccentric recess (124) there is Fig. 5, for example, a slot-like recess (126) traversing the guide section (123) and oriented parallel to the eccentric recess (124). Between the eccentric recess (124) and the recess (126), a spring bar (127) remains, the wall thickness of which, depending on the spring rate, is, for example, between 0.5 and 1.5 mm.

[0024] The front end of the clamping bolt (121), the expansion section (133), has the shape of a short stepped cylinder which merges into the adjacent waist section (131) by means of a truncated cone (134). The truncated cone (134) has an apex angle of, for example, 110 degrees, with the imaginary apex of the truncated cone (134) lying on the clamping bolt center line in the area of ​​the waist section (131). The waist diameter is smaller than the maximum diameter of the expansion section (133). The waist section (131), against which, for example, six collet segments (141) of the segment collet (120) rest, merges into the larger-diameter guide section (123) by means of a stepped front face.

[0025] In the area of ​​the sections (133, 131) there is, for example, a central longitudinal bore (135) and two inclined bores (136) for internal coolant and / or lubricant guidance, cf. Fig. 2 and Fig. 5.

[0026] The pliers segments (141) are each rocker pieces, the surface of which is oriented towards the center line (15) and has two contact areas, each of which is adapted to the outer contour of the waist section (131), cf. Fig. 5 and Fig. 6. In longitudinal section, the pliers segments (141) are small toggle levers which have a bending angle of e.g. 169 degrees.

[0027] After Fig. 5, the short rear lever arm rests against the waist section (131) when the segment collet (120) is open, while the longer front lever arm, which ends in a radially outwardly projecting clamping rib (142), protrudes according to the bending angle. A radial rib (143) protrudes radially in the bending angle zone, behind which, in the area of ​​the rear lever arm, lies a notch (144) with a semicircular cross-section that accommodates an annular spring (145).

[0028] When the segment collet (120) is mounted, the collet segments (141) are surrounded by a split support ring (147) in the area of ​​the radial ribs (143) and the annular spring (145). The support ring (147) has an inner annular groove (148) into which individual radial ribs (143) protrude. It is axially fixed in the tool recess (91) in the support ring seat (93) by a retaining ring (149) and sealed there by a sealing ring arranged in an outer annular groove.

[0029] In Fig. 7, the eccentric shaft (151) is shown separately with its two sealing rings (177, 178). The eccentric shaft (151) has three sections. The first section, which is located Fig. 7, is the actuating section (152). It has a cylindrical outer contour with an annular groove for receiving the sealing ring (177). Its free end face is, for example, a spherical, convex surface (154), whose radius of curvature corresponds, for example, to half the length of the eccentric shaft (151). It has a transverse actuating groove (155) with a rectangular cross-section, for example, 6 mm deep. The depth of the actuating groove (155) corresponds to half the actuating groove width.

[0030] At the other end of the eccentric shaft (151) is the cylindrical fixed bearing section (171), which has an annular groove for receiving a sealing ring (178). Its free end face (172) has a central threaded bore (173), through which a positioning disc (174) is screwed to the eccentric shaft (151) by means of a countersunk screw (176). The positioning disc (174) is a single-stepped disc with a central countersunk bore and a flat collar (175) on the disc step. In the assembled state, vg1. Fig. 3 and Fig. 4, the annular web (97) of the transverse bore (96) of the spindle (80) is axially fixed between the collar (175) and the end face (172) with slight play.

[0031] The eccentric section (161), whose length is slightly greater than the depth of the eccentric recess (124) of the clamping bolt (121), has, for example, three active eccentric centers (163, 165, 167) with different eccentricities and curvatures (164, 166, 168). The cross section (157) of the eccentric section (161) is in relation to the cross section of the eccentric recess (124) in the Fig. 8 to 11 shown in different swivel positions.

[0032] Fig. Figure 8 shows the eccentric recess (124) of the unclamped clamping bolt (121) with the cut eccentric shaft (151). The eccentric shaft (151) contacts the left wall of the eccentric recess (125) with its first eccentric curve (164). This eccentric curve (164) has a radius of, for example, 7.6 mm with an eccentricity of approximately 12 mm. The angular range of this eccentric curve (164) measures approximately 31 degrees.

[0033] The Fig. Figure 9 shows the eccentric shaft (151) pivoted approximately 29 degrees counterclockwise with the clamping bolt (121) shifted approximately 0.93 mm in the clamping direction. Here, the transition point between the first eccentric curve (164) and the second eccentric curve (166) lies against the left wall (125) of the eccentric recess (124). The second eccentric curve (166) has a radius of, for example, 2 mm with an eccentricity of approximately 4.9 mm. The angular range of this eccentric curve (166) measures approximately 45 degrees.

[0034] In Fig. 10 shows the eccentric shaft (151) pivoted by approximately 45 degrees. In the meantime, the clamping bolt (121) has been moved by a further 1.6 mm to the right. Fig. 10, the transition point between the second eccentric curve (166) and the third eccentric curve (168) lies on the left wall (125) of the eccentric recess (124). This third effective eccentric curve (168) has a radius of, for example, 7.3 mm and an eccentricity of approximately 0.53 mm. The angular range of this eccentric curve (168) measures approximately 104 degrees.

[0035] Fig. Figure 11 shows the end position of the eccentric shaft (151) at the maximum possible stroke of the clamping bolt (121) in the clamping direction. For this purpose, the clamping bolt (121) was moved by a further 0.9 mm. The total pivot angle of the eccentric shaft (151) is approximately 175 degrees.

[0036] Since the eccentric shaft (151) fits as an irregular constant thickness in any angular position with little play between the two opposite walls - normal to the center line - it has a few more eccentric curvatures, which, however, do not reach the wall (125) for clamping.

[0037] The surface of the eccentric section (161) may be surface-treated. For example, a titanium or chromium nitride layer is applied as a wear-resistant PVD coating.

[0038] The proximity of the eccentric shaft (151) to the front face (82) of the spindle (80), which represents the flat contact surface of the tool to be clamped, enables, among other things, a short overall length of the tool unit. The distance (5) between the pivot axis (75) of the eccentric shaft (151) and the free face (82) of the spindle (80) - measured in millimeters - must be selected such that it is less than or equal to the sum of two specific summands. One summand is the number "8". The other summand is a product of the factors "0.9" and the usable face diameter. „ d1" - specified in millimeters - of the ISO / DIS 26623-2 of the respective interface dimension type.

[0039] For the interface dimension types “C3”, “C4” and “C5”, the end face diameters “d1” have the values ​​32 mm, 40 mm and 50 mm, while the corresponding distances (5) measure e.g. 36.5 mm, 43 mm and 53 mm.

[0040] The Fig. The eccentric shaft (151) shown in Figure 7 can be designed so that it is not imbalanced with respect to its pivot axis (75). Alternatively, the eccentric shaft (151) can be shaped such that its center of mass—when installed—is located both near the pivot axis (75) and near the center line (15) or in the middle of the longitudinal extension of the eccentric shaft (151). In this case, the positioning disc (174) and the countersunk screw (176) are part of the eccentric shaft (151).

[0041] The actuating assembly (40) consists of a holding element (41) arranged in the transverse bore (23) in the housing (10) and a spring-loaded actuating element (51) mounted therein, cf. Fig. 12. The retaining element (41) is essentially a pot-shaped body with a centrally drilled base (44). On its cylindrical outer surface, it has two opposing, partially cylindrical recesses (43) for securing the retaining element (41) in the housing (10), see also Fig. 2 and Fig. 4.

[0042] A stop skirt (45) is formed on the underside of the base (44) on the retaining element (41). The latter is part of a tubular section, e.g., 7.53 mm long, whose cross-section lacks a circular ring cutout of, e.g., 205 degrees. When mounted in the housing (10), the base (44) rests against the inner collar of the single-stepped transverse bore (23), see Fig. Fig. 4. Two cylinder head screws (48), the heads of which partially protrude into the recesses (43), hold the retaining element (41) there in a force-locking and form-locking manner.

[0043] The fixing of the holding element (41) in the axial direction and / or in the circumferential direction in the housing (10) can also be carried out by other standard parts, e.g. by pins inserted longitudinally and / or transversely.

[0044] The actuating element (51), cf. Fig. 12, is a single-stepped bolt, made e.g. from heat-treatable steel 42CrMo4 and tempered, which has a larger diameter in a front sealing area (61), in which it has an annular groove for receiving a sealing ring (62). The longer, rear, also cylindrical guide area (65) has a rear, flat end face (67) in some areas, which carries a tab-like actuating web (68) as an end structure (66). This actuating web (68) has two parallel flanks and fits into the actuating groove (155) of the eccentric shaft (151) with slight play in terms of its flank distance. The free web end face (69) of the actuating web (68) is provided with a concavely curved, spherical surface (69), the axis of symmetry of which is the center line (75) of the actuating element (51). The curvature of the spherical surface (69) corresponds, for example, to the curvature of the free end face (154) of the eccentric shaft (151).

[0045] The guide area (65) has a radially oriented transverse bore (71) near the actuating web (68), in which a cylindrical stop pin (72) is pressed in partially, cf. Fig. 4. The center line of the stop pin (72) runs parallel to the flanks of the actuating web (68).

[0046] A helical compression spring (78) is arranged between the collar (63) located between the sealing area (61) and the guide area (65) and the bottom (44) of the holding element (41), see also Fig. 4. It pushes the actuating element (51) mounted in the retaining element (41) outward. When the stop pin (72) rests against the base (44) of the retaining element (41), the outer end face (53) of the actuating element (51) is at least almost flush with the front end face (42) of the retaining element (41).

[0047] Within the holding element (41), the actuating element (51) is pivotable in sections about the center line (75) and is mounted so as to be longitudinally displaceable against the spring force of the helical compression spring (78).

[0048] At the rear end of the spindle (80), a coupling ring (181) is mounted on the spline (112) of the coupling shaft (111) to form a positioning coupling (180). This coupling ring (181) is a tubular body with a radially outwardly projecting locking lug (182) in the rear region, see. Fig. 3. The locking lug (182) has two lateral flanks, for example, which enclose an angle of 50 degrees. The coupling ring (181) is supported by a helical compression spring (183) on the collar web (113) of the coupling shaft (111). As shown in Fig. As shown in Figure 3, the locking lug (182) is wedged into the rear end groove (34) of the housing (10) via its flanks (cf. DE 42 28 946 C2). When the tool unit is adapted to the machine tool, the coupling ring (181) is pushed into the stepped bore (14) until the locking lug (182) no longer protrudes into the end groove (34). The positioning coupling (180) is now disengaged.

[0049] If the tool adapter is separated from the machine tool when the locking lug (182) of the positioning coupling (180) is positioned in front of the face groove (34), the actuating web (68) of the actuating element (51) is located directly or almost directly in front of the actuating groove (155) of the eccentric shaft (151).

[0050] Before being adapted to the machine tool, the tool adapter is usually in a state in which the eccentric shaft (151) of the segment collet (120) is aligned with the actuating element (51). This is ensured by the coupling (180), if present.

[0051] When aligning the eccentric shaft (151) with the actuating element (51), it is assumed that the center line (59) of the actuating element (51) lies at least approximately in a plane (29) normal to the center line (15). In order to allow for a certain tolerance here, it is assumed that the points created by the intersection of the center line (59) with the two end faces (53, 69) of the actuating element (51) lie in a space delimited by two parallel planes, e.g., 2 mm apart, with the plane (29) being a center plane oriented to these planes. The planes are parallel to the center plane (29).

[0052] Before inserting the tool into the tool holder (91), the eccentric shaft (151) and the actuating element (51) are in the position shown in the Fig. 2 to 5, which is determined, among other things, by the last tool removal. Here, the segment collet (120) is therefore open. The marking (55) of the actuating element (51) is aligned with the marking (47) of the holding element (41), see Fig. 2.

[0053] After inserting the tool assembly into the machine tool and locating the tool in the interface recess (92), a hexagonal tool is inserted into the hexagon socket (54) of the actuating element (51). Using the hexagonal tool, the actuating element (51) is pushed approximately 4 mm radially into the housing (10). This causes the actuating web (68) to enter the actuating groove (155) of the eccentric shaft (151), creating a positive fit.

[0054] Instead of the parts (68, 155) used to create the described positive contact, structures based, for example, on a cross-shaped web, a Phillips-shaped profile, a hexagon or polygon, a polygonal shape, a Torx structure, a Hirth, serrated, or wedge toothing can also be used. Other connectable shapes or combinations thereof are also conceivable. A comparable variety of engagement forms also applies to the engagement of the hexagon tool in the hexagon socket (54).

[0055] After the engagement of the actuating web (68) in the actuating groove (155), the actuating element (51) and the eccentric shaft (151) are moved as shown in Fig. 2 is pivoted clockwise, i.e., to the right. The eccentric section (161) of the eccentric shaft (151) is pressed directly against the wall (125) of the eccentric recess (124) in a sliding movement, see. Fig. 8 to 11. The various eccentric curvatures (164, 166, 168) engage one after the other. The clamping bolt (121) of the segment collet (120) is initially moved slowly, then accelerated, and finally moved relatively slowly again, at a constant angular speed of the eccentric shaft (151).

[0056] During this movement of the clamping bolt (121), the clamping webs (142) of the collet segments (141) first engage in an inner ring groove of the tool, and are then clamped there by the expanding section (133). In the final movement phase, the tool is pulled with great force into the interface recess (92). The tool clamping is complete when the tool rests firmly against the end face (82) of the spindle (80). The mark (56) of the actuating element is now in front of the mark (47) of the holding element (41).

[0057] Furthermore, the pivoting angle of the actuating element (51) is limited by the stop pin (72) and the stop apron (45) formed on the holding element (41).

[0058] The hexagon tool inserted into the hexagon socket (54) can be withdrawn. The return spring (78) pushes the actuating element (51) outward again, so that the actuating bar (68) is pulled out of the actuating groove (155). There is now a maximum distance of 0.5 mm between parts (68) and (155). The tool clamping process is complete.

[0059] Now, the actuating element (51) has assumed exactly the same angular position as the eccentric shaft (151) – e.g., when the eccentric shaft (151) is rotated using a precisely specified torque. This position of the actuating element (51) can be maintained, e.g., by ensuring the sealing ring (62) is tightly seated – even during operation of the tool.

[0060] Alternatively, the position of the actuating element (51) relative to the retaining element (41) can also be secured by a positive fit in closely spaced locking positions. For this purpose, for example, the base (44) of the retaining element (41) has several adjacent notches. The stop pin (72) then engages positively in the nearest notch—at least in part. Other axially effective coupling contours, such as spur gearing or the like, can also be used here.

[0061] It is also possible to move the eccentric shaft (151) between two precisely defined positions between loosening and clamping. In this case, a definable elasticity is built into the segment collet (120) to ensure a clamping force within a specific tolerance range. Fig. 5 For this purpose, for example, a recess (126) is machined into the clamping bolt (121) below the wall (125) of the eccentric recess (124). Between the recesses (124, 126) there is thus a continuous elastic web (127), which is subjected to tensile and bending stresses when the eccentric shaft (151) pivots. The spring rate can be precisely determined by the wall thickness or width of the spring web (127) and by appropriately adapting the shape of the recess (126). If necessary, the web (127) can also be slotted entirely or in certain areas.

[0062] Instead of this integrated spring element (127), the clamping bolt (121) can be extended in the rear area to create a conventional, flexible eccentric system. The latter can consist of a support plate sprung by means of a conventional spring element, e.g., a disc spring or a disc spring stack. Other solutions with equivalent functionality are also conceivable.

[0063] In any case, the actuating element (51) can rest positively against the holding element (41) in both end positions - with respect to its two pivoting positions.

[0064] If the actuating element (51) and the spindle (80) do not remain in the intended position when changing the tool unit, the engagement position, i.e., the aligned position of the parts (51, 151), can be sensed by rotating the spindle (80) with the actuating element (51) under radial load. Since the front structure (153) protrudes slightly beyond the cylindrical wall (87) of the spindle (80), the desired position can be easily detected.

[0065] This is particularly easy if the contour of the positioning disc (174), including the countersunk screw (176), remains at least slightly behind or within the cylindrical wall (87) of the spindle (80). Since the end structure (153) has a larger diameter than the cross-section of the fixed bearing section (171) and is concavely curved, it cannot penetrate into the spindle (80) in the area of ​​the fixed bearing section (171).

[0066] If the actuating element (51) is located approximately in front of the actuating section (152), the actuating web (68) engages during the first half revolution when the actuating element (51) is loaded, since the actuating element (51) is centered on the convex end face (154) of the actuating section (152) due to its concave web end face (69).

[0067] The segment collet (120) can be replaced on this tool unit without having to remove the spindle (80) from the housing (10). For this procedure, the complete actuation assembly (40) is first removed by removing the screws (48), see Fig. Fig.4, removed. In a further step, the spindle (80) is pivoted through 180 degrees around its center line (15) so that the fixed bearing section (171) of the eccentric shaft (151) is positioned in front of the cross bore (23). The positioning disc (174) can now be detached from the eccentric shaft (151) and removed from the housing (10) using the countersunk screw (176). In a further step, the spindle (80) is pivoted back through 180 degrees so that the actuating section (152) is positioned in front of the cross bore (23). At the bottom of the actuating groove (155) there is a central extraction thread (156) into which a longer screw is screwed in order to remove the eccentric shaft (151) from the eccentric recess (124) and through the cross bore (23) out of the housing (10). For this purpose, the diameter of the cross bore (23) there is larger than the maximum outer diameter of the eccentric shaft (151).

[0068] Now, the retaining ring (149) located between the interface recess (92) and the support ring seat (93) in the tool recess (91) is removed. Finally, the clamping bolt (121) can be removed forward from the spindle (80) together with the support ring (148) and the collet segments (141). List of reference symbols: 5 Distance 10 Housing of the tool unit 11 Front housing 12 Operating side 13 Front, rear, large 14 stepped bore 15 Center line 16 Section, front 17 shoulder ball bearings, front, rolling bearings 18 Housing collar 19 Housing bar, projecting inwards 21 needle bearings, rear, rolling bearings 22 inner ring groove 23 Cross bore of the housing, stepped 24 Center line 25 Threaded hole with cylindrical countersink 26 Housing interior 27 Housing longitudinal bore 29 Level 31 Housing mount, rear; VDI cylindrical shank according to DIN 69880 32 Front, rear, small 33 Flattening 34 Face groove, rectangular groove, rear 35 Housing cover 36 lip seal 37 Labyrinth seal 38 Angle connection, external coolant supply 39 Swivel ball adapter 40 Actuator assembly 41 Holding element 42 Front face, front 43 depressions 44 Floor 45 stop apron 47 Marking line 48 countersunk screws, cylinder head screws 51 Actuating element 52 Forehead structure, outside 53 Front face, outside 54 hexagon socket 55 Marking line 56 Marking sector 59 Center line 61 Sealing area, front 62 sealing ring 63 Bund 65 Management area 66 Forehead structure, inside 67 Frontal surface, flat, rear 68 Operating bridge 69 Web end face, surface, spherically concave curved 71 Cross hole, small 72 stop pin 75 Center line, swivel axis 78 Return spring, helical compression spring 80 spindle 81 Mounting part, front 82 Front face, front 83 storage section 84 external threads 85 wave collar, front 86 waistband, back 87 wall, cylindrical 91 Tool holder; tool recess, interface for polygonal hollow shank tapers, e.g. Capto interface 92 Interface recess, polygonal hollow cone, area of ​​(91) 93 Support ring seat, area of ​​(91) 95 Eccentric bore, area of ​​(91) 96 Cross bore of the spindle 97 Ringsteg 99 rags 101 Shaft nut 102 Wraparound 111 Clutch shaft, rear 112 spline 113 gutter 114 groove 116 Screw, cylinder head screw 117 Assembly joint 120 segment collet 121 clamping bolts 123 Guide Section 124 Eccentric recess 125 wall to the exciting system of (161) 126 Recess, spring recess 127 spring bar, spring element 128 Center line 131 waist section, waist 133 Spreading section 134 truncated cone 135 Longitudinal bore 136 inclined holes 141 pliers segments 142 clamping bar 143 Radial web 144 notch 145 Ringfeder 147 Support ring, two-piece 148 Ring groove, inner 149 Retaining ring 150 eccentric clamping device 151 Eccentric shaft 152 Actuating section, 1st section; Actuating adapter 153 Forehead structure 154 Frontal surface, spherical, convex 155 Actuating groove 156 pull-out thread 157 Cross section of (161) 161 Eccentric section, 2nd section 163 Eccentric center, first 164 Eccentric curvature, first 165 Eccentric center, second 166 Eccentric curvature, second 167 Eccentric center, third 168 Eccentric curvature, third 171 fixed bearing section, 3rd section 172 Frontal surface, free 173 threaded hole 174 Positioning disc 175 bundles 176 countersunk screw 177, 178 Sealing rings 180 Coupling, longitudinally adjustable, torsionally rigid, positioning coupling 181 Coupling ring 182 locking lug 183 Clutch spring, helical compression spring

Claims

[1] Tool unit with at least one drivable spindle (80) arranged in a housing (10), wherein the spindle (80) has a tool holder (91) with an integrated eccentric clamping device (150), wherein the eccentric clamping device (150) has an eccentric shaft (151) which carries an actuating adapter (152) at at least one end, wherein for clamping a tool in the tool holder (91) in the spindle (80) a segment collet (120) is arranged, which is in an operative connection with the eccentric clamping device (150), wherein an actuating assembly (40) with at least one holding element (41), at least one actuating element (51) and at least one return spring (78) is arranged in the housing (10), - wherein the actuating element (51) has a front structure (66) located in the housing interior (26) which - when the spindle (80) is stationary - is suitable for coupling to the actuating adapter (152), characterized by , - that the actuating element (51) is pivotally and longitudinally displaceably mounted in the housing (10) and / or in the holding element (41) in order to move the eccentric shaft (151) between two fixed positions between release and clamping, - that the pivot axis (75) of the eccentric shaft (151) lies at least approximately in a plane (29) in which the center line (59) of the actuating element (51) also lies, - that a definable elasticity is built into the segment collet (120), - that for this purpose, a recess (126) oriented parallel to an eccentric recess (124) is machined below a wall (125) of the eccentric recess (124) in a clamping bolt (121) of the segment collet (120), so that an elastic web (127) is located between the eccentric recess (124) and the recess (126). [2] Tool unit according to claim 1, characterized bythat the center line (59) of the actuating element (51) is arranged perpendicular to the center line (15) of the spindle (80) - intersecting it. [3] Tool unit according to claim 1, characterized by that the inner end structure (66) of the actuating element (51) has a design which fits at least partially in a form-fitting manner with the end structure (153) of the actuating adapter (152). [4] Tool unit according to claim 1, characterized by that the spindle (80) or a shaft downstream of the spindle (80) has a longitudinally displaceable, torsionally rigid coupling (180) for the blocking coupling of the spindle (80) or the shaft to the housing (10), wherein the coupling (180) can be uncoupled by adapting the tool unit to the machine carrying it. [5] Tool unit according to claim 1, characterized by that the tool holder (91) is a so-called Capto interface according to the draft standards ISO / DIS 26623-1 and ISO / DIS 26623-2. [6] Tool unit according to claim 1, characterized by that the pivot axis (75) of the eccentric shaft (151) has a distance (5) in millimeters from the free end face (82) of the spindle (80) which consists of a sum of two summands, one summand being the number "8" and the other summand being a product composed of the factors "0.9" and the usable end face diameter "d1" - in millimeters - of ISO / DIS 26623-2 of the respective interface dimension type. [7] Tool unit with at least one drivable spindle (80) arranged in a housing (10), wherein the spindle (80) has a tool holder (91) with an integrated eccentric clamping device (150) and wherein the eccentric clamping device (150) has an eccentric shaft (151) which carries an actuating adapter (152) at at least one end, - wherein an actuating assembly (40) with at least one holding element (41), at least one actuating element (51) and at least one return spring (78) is arranged in the housing (10), - wherein the actuating element (51) has a front structure (66) located in the housing interior (26), which - when the spindle (80) is stationary - is suitable for coupling to the actuating adapter (152), and - wherein the holding element (41) is arranged in a transverse bore (23) of the housing (10), characterized by , - that the actuating element (51) is pivotally and longitudinally displaceably mounted in the housing (10) and / or in the holding element (41), - that the pivot axis (75) of the eccentric shaft (151) lies at least approximately in a plane (29) in which the center line (59) of the actuating element (51) also lies, - that the actuating assembly (40) can be removed from the housing (10) by removing screws (48), - that a diameter of the transverse bore (23) is larger than the maximum outer diameter of the eccentric shaft (151), - that the eccentric shaft (151) can be removed from the eccentric recess (124) and through the transverse bore (23) out of the housing (10) when the spindle (80) is mounted, - that the actuating adapter (152) has a pull-out thread (156) for a screw-in screw, with the aid of which the eccentric shaft (151) can be removed from the eccentric recess (124) and through the transverse bore (23) out of the housing (10), - that an end face of a cylindrical fixed bearing section (171) of the eccentric shaft (151) carries a threaded bore (173) through which a positioning disc (174) is screwed to the eccentric shaft (151) by means of a countersunk screw (176), and - that the fixed bearing cutout (171) of the eccentric shaft (151) can be positioned in front of the transverse bore (23) so that the positioning disc (174) can be released from the eccentric shaft (151) and removed from the housing (10) using the countersunk screw (176). [8] Tool unit with at least one drivable spindle (80) arranged in a housing (10), wherein the spindle (80) has a tool holder (91) with an integrated eccentric clamping device (150) and wherein the eccentric clamping device (150) has an eccentric shaft (151) which carries an actuating adapter (152) at at least one end, - wherein an actuating assembly (40) with at least one holding element (41), at least one actuating element (51) and at least one return spring (78) is arranged in the housing (10), - wherein the actuating element (51) has a front structure (66) located in the housing interior (26) which - when the spindle (80) is stationary - is suitable for coupling to the actuating adapter (152), characterized by ; . - that the actuating element (51) is pivotably and longitudinally displaceably mounted in the housing (10) and / or in the holding element (41), - that the pivot axis (75) of the eccentric shaft (151) lies at least approximately in a plane (29) in which the center line (59) of the actuating element (51) also lies, and that a pivot angle of the actuating element (51) is limited by a stop pin (72) and a stop apron (45) formed on the holding element (41).

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