Clamping device for clamping a hollow workpiece and method for machining, measuring and / or testing a hollow workpiece

Abstract

Clamping device (100) for clamping a hollow workpiece (102) with an inner workpiece surface, the clamping device (100) having a clamping axis (108), a radially expandable clamping sleeve (110) with a clamping sleeve outer surface assigned to the inner workpiece surface and a clamping sleeve inner surface, and a clamping mandrel (112) with a clamping mandrel outer surface assigned to the inner clamping sleeve surface for radially expanding the clamping sleeve (110), wherein the clamping device (100) is adjustable between a release position and a clamping position by rotating the clamping sleeve (110) and the clamping mandrel (112) about the clamping axis (108) relative to one another, and a method for machining, measuring and / or testing a hollow workpiece (102) with an inner workpiece surface, wherein the workpiece (102) is clamped using such a clamping device (100).

Description

[0001] The invention relates to a clamping device for clamping a hollow workpiece with an inner workpiece surface. The clamping device comprises a clamping axis, a radially expandable clamping sleeve with an outer clamping sleeve surface associated with the inner workpiece surface and a clamping sleeve inner surface, and a clamping mandrel with an outer clamping mandrel surface associated with the inner clamping sleeve surface for radially expanding the clamping sleeve. Furthermore, the invention relates to a method for machining, measuring, and / or testing a hollow workpiece with an inner workpiece surface.

[0002] Document DE 24 05 527 A1 relates to a feed collet with a clamping sleeve that is longitudinally slotted to form clamping jaws for engaging the bar material, and a receiving bushing into which the clamping sleeve can be inserted and screwed adjustably by means of a thread. The clamping sleeve has an outer cone tapering in the insertion direction on its circumference, and the receiving bushing has a corresponding inner cone, which cooperate to adjust the radial clamping force of the clamping sleeve. In order to enable adjustment of the feed force and to reduce cylindrical clamping and wear of the inner bore when adjusting the clamping force, document DE 24 05 527 A1 proposes designing the receiving bushing as an outer clamping sleeve with multiple longitudinal slots, which generates the radial clamping force and transmits it radially to the clamping sleeve.

[0003] Document DE 199 31 861 A1 relates to a clamping device comprising a mandrel provided at least at one end with coupling elements for coupling to the main spindle of a machine tool. In order to ensure that very thin-walled and relatively long workpieces can be properly clamped largely independent of irregularities in their outer surface, and that their inner surface can be machined with the required accuracy and surface quality, document DE 199 31 861 A1 proposes that the mandrel have a first contact surface at one end region, which is axially aligned and faces the other end region of the mandrel, which is arranged immovably on the mandrel in the axial direction. A second contact surface is provided on the mandrel at the other end region, which is axially aligned and faces one end region and is arranged on a clamping body that is guided displaceably on the mandrel in the axial direction.a clamping device is provided by means of which the clamping body with the second contact surface can be adjusted relative to the first contact surface and can be fixed to the clamping mandrel by applying an axial clamping force, at least one clamping sleeve is provided which is made of an elastomer, the inner diameter of which is matched to the outer diameter of the clamping mandrel, the end faces of which are matched to the first contact surface and the second contact surface, the clamping sleeve has on its outer side a plurality of support strips made of a metallic material which are permanently connected to the clamping sleeve, which are evenly distributed around the circumference of the clamping sleeve and whose outer side each forms a cylindrical surface section which is matched to the inner diameter of the workpiece.

[0004] The invention is based on the object of structurally and / or functionally improving a clamping device mentioned above. Furthermore, the invention is based on the object of structurally and / or functionally improving a method mentioned above.

[0005] The object is achieved by a clamping device having the features of claim 1. Furthermore, the object is achieved by a method having the features of claim 11. Advantageous embodiments and / or further developments are the subject of the subclaims.

[0006] The clamping device is designed and / or can be arranged to clamp a hollow workpiece. The clamping device can be designed and / or can be arranged to clamp a hollow workpiece in order to rotate the workpiece, measure it, and / or inspect it. The clamping device can be designed for use in manufacturing and / or quality assurance.

[0007] The workpiece has an inner surface. The inner surface can have a circular cylindrical shape. The workpiece can be a hollow shaft. The workpiece can have a hollow shaft or a hollow shaft section. The workpiece can be rotationally symmetrical. The workpiece can be designed and / or arranged as a drive element. The workpiece can have teeth. The workpiece can have a gear. In this respect, the clamping device for clamping a workpiece can be designed to machine, measure and / or test teeth or a gear, in particular using a single-flank rolling test. The teeth or the gear and the hollow shaft or the hollow shaft section can be manufactured as a single piece. The teeth or the gear and the hollow shaft or the hollow shaft section can initially be manufactured separately from one another and then firmly connected to one another.The workpiece can be a workpiece with particularly high precision requirements. The workpiece can be a micro-workpiece. The gearing can be a micro-gearing. The gear can be a micro-gearing. The workpiece can be designed for use in a micro-gearbox or a precision watch. The workpiece can be an automotive or medical workpiece.

[0008] The clamping device has a clamping axis, a clamping sleeve, and a clamping mandrel. The clamping axis can be a longitudinal axis, a rotational axis, and / or an axis of symmetry. Unless otherwise stated or the context indicates otherwise, the terms "axial," "radial," and "in circumferential direction" refer to a direction of extension of the clamping axis. "Axial" then corresponds to a direction of extension of the clamping axis. "Radial" then is a direction perpendicular to the direction of extension of the clamping axis and intersecting the clamping axis. "In circumferential direction" then corresponds to a direction of a circular arc around the clamping axis.

[0009] The clamping sleeve has an outer surface and an inner surface. The outer surface of the clamping sleeve is assigned to the inner surface of the workpiece. The outer surface of the clamping sleeve can be designed and / or arranged to interact with the inner surface of the workpiece. The inner surface of the clamping sleeve can be assigned to the outer surface of the clamping mandrel. The inner surface of the clamping sleeve can be designed and / or arranged to interact with the outer surface of the clamping mandrel. The clamping sleeve is radially expandable. The clamping sleeve can be reversibly and / or elastically expandable. The clamping sleeve can be expanded from an initial shape under the action of a clamping force and / or a holding force. After the clamping force and / or the holding force are removed, the initial shape can be independently acceptable. The clamping sleeve can be made of a steel, in particular a tool steel, in particular a cold-work steel.The clamping sleeve can be made of high-alloy steel. The clamping sleeve can be hardened and tempered, at least in sections.

[0010] The clamping mandrel is designed and / or arranged to radially expand the clamping sleeve. The clamping mandrel has an outer surface. The outer surface of the clamping mandrel is associated with the inner surface of the clamping sleeve. The outer surface of the clamping mandrel can be designed and / or arranged to interact with the inner surface of the clamping sleeve. The clamping mandrel can be made of a steel, in particular a tool steel, in particular a cold-work steel. The clamping mandrel can be made of a high-alloy steel. The clamping mandrel can be tempered, at least in sections.

[0011] The clamping sleeve and / or the clamping mandrel can be rotated relative to one another about the clamping axis. The clamping sleeve and / or the clamping mandrel can be rotated in a first direction of rotation and in a second direction of rotation opposite to the first direction of rotation. The clamping sleeve and / or the clamping mandrel can be rotated to a limited extent. The clamping sleeve and / or the clamping mandrel can be rotated between two end positions. The clamping device can be adjusted between a release position and a clamping position. The clamping device can be adjusted between a release position and a clamping position by rotating the clamping sleeve and the clamping mandrel relative to one another about the clamping axis.

[0012] Corresponding round wedge sections can be effective between the clamping sleeve and the clamping mandrel. A round wedge section assigned to the clamping sleeve and a round wedge section assigned to the clamping mandrel can correspond to one another. A round wedge section assigned to the clamping sleeve and a round wedge section assigned to the clamping mandrel can be designed and / or arranged to interact with one another. A round wedge section assigned to the clamping sleeve and a round wedge section assigned to the clamping mandrel can be geometrically complementary to one another, at least in sections. A round wedge section assigned to the clamping sleeve can also be referred to as a first round wedge section. A round wedge section assigned to the clamping mandrel can also be referred to as a second round wedge section.

[0013] A round wedge section can have a wedge surface that slopes upwards or downwards at an angle to the circumferential direction. The wedge surface can slope upwards or downwards at least approximately constantly. The wedge surface can be formed using a curved surface. The wedge surface can have straight curvature lines and / or at least approximately spiral curvature lines. The straight curvature lines can run parallel to the clamping axis.

[0014] The clamping sleeve can have first round wedge sections arranged on the inner surface of the clamping sleeve. The clamping sleeve can have two, three, four, five, or six first round wedge sections. The clamping sleeve can have an even or odd number of first round wedge sections. The clamping mandrel can have second round wedge sections arranged on the outer surface of the clamping mandrel. The clamping mandrel can have two, three, four, five, or six second round wedge sections. The clamping mandrel can have an even or odd number of first round wedge sections. The first round wedge sections and the second round wedge sections can correspond to one another. The first round wedge sections and the second round wedge sections can be designed and / or arranged to interact with one another. The first round wedge sections and the second round wedge sections can be arranged evenly distributed in the circumferential direction.The first round wedge sections and the second round wedge sections can be geometrically complementary to each other, at least in sections.

[0015] The round wedge sections can be designed for self-locking in the clamping position. The round wedge sections can be designed to allow easy release from the clamping position. The round wedge sections can each have a taper ratio 15≥C≥110 The cone ratio can be C=2⋅(r1−r2)lk where r1 is a maximum radius of the round wedge section, r2 is a minimum radius of the round wedge section and l k is a length of the round wedge section. The length of the round wedge section can be a developed length.

[0016] The clamping sleeve can have a sleeve section. The clamping sleeve can have an outer contour with a constant cross-section and / or an inner contour with a constant cross-section on the sleeve section along the clamping axis. "Cross-section" in this context refers in particular to a section perpendicular to the clamping axis. The clamping sleeve can have a circular-cylindrical outer contour on the sleeve section. The sleeve section can have clamping sections and slots arranged between the clamping sections. The clamping sections and the slots can run in the direction of extension of the clamping axis. The slots can be designed and / or arranged to enable radial expansion of the clamping sleeve and / or radial displacement of the clamping sections. The slots can be produced using a separating process, in particular a thermal separating process, in particular by spark erosion.The first round wedge sections can be arranged on the clamping sections.

[0017] The clamping sleeve can have a head section. The head section can be arranged following the sleeve section in the direction of extension of the clamping axis. The clamping sleeve can have a cross-section with a constant outer contour at the head section along the clamping axis. The outer contour at the head section of the clamping sleeve can be designed and / or arranged to enable force to be introduced to rotate the clamping sleeve in order to adjust the clamping device between the release position and the clamping position. The clamping sleeve can have a cross-section at the head section with an outer contour that is radially expanded with respect to the sleeve section. The clamping sleeve can have a cross-section with a polygonal outer contour at the head section.The term “polygon” in this context refers in particular to lines of a polygonal line delimiting the cross-section, whereby the lines can have equal lengths and transitions between the lines can be rounded. In particular, the clamping sleeve can have a cross-section with four or six lines at the head section. The clamping sleeve can have a cross-section with a constant inner contour at the head section along the clamping axis. The clamping sleeve can have a circular-cylindrical inner contour at the head section. The clamping sleeve can have a cross-section with an inner contour that is radially expanded with respect to the sleeve section. The slots of the sleeve section can extend into the head section in the direction of extension of the clamping axis.

[0018] The clamping sleeve may have a guide portion. The guide portion of the clamping sleeve may be arranged on the head portion. The guide portion of the clamping sleeve may be formed with the inner contour arranged on the head portion.

[0019] The clamping sleeve may have a first stop portion for the workpiece. The first stop portion of the clamping sleeve may be arranged on the outer surface of the clamping sleeve. The first stop portion of the clamping sleeve may be arranged between the sleeve portion and the head portion. The first stop portion of the clamping sleeve may be formed with a first axial surface. The first axial surface may have an annular shape. The first axial surface may be arranged at an end of the head portion facing the sleeve portion.

[0020] The clamping sleeve can have a second stop section for the clamping mandrel. The second stop section of the clamping sleeve can be arranged on the inner surface of the clamping sleeve. The second stop section of the clamping sleeve can be arranged on the head section. The second stop section of the clamping sleeve can be formed with a second axial surface. The second axial surface can have an annular shape. The second axial surface can be arranged on an end of the guide section facing the sleeve section.

[0021] The clamping mandrel can have a mandrel section. The clamping mandrel can have an outer contour with a constant cross-section along the clamping axis. The second round wedge sections can be arranged on the mandrel section.

[0022] The clamping mandrel can have a guide section. The guide section can be arranged following the mandrel section in the direction of extension of the clamping axis. The clamping mandrel can have a cross-section with a constant outer contour at the guide section along the clamping axis. The clamping mandrel can have a circular-cylindrical outer contour at the guide section. The clamping mandrel can have a cross-section with an outer contour that is radially expanded with respect to the mandrel section at the guide section.

[0023] The mandrel may have a stop portion. The stop portion of the mandrel may be formed with an axial surface. The axial surface may have a ring-like shape. The stop portion of the mandrel may be arranged between the mandrel portion and the guide portion.

[0024] The mandrel can have a clamping section. The clamping section can be arranged following the guide section in the direction of extension of the clamping axis. The clamping section can be designed and / or arranged to enable the mandrel to be clamped in a chuck. The chuck can be a chuck of a processing machine, in particular a lathe, or a chuck of a measuring and / or testing device. The mandrel can have a cross-section with a constant outer contour at the clamping section along the clamping axis. The mandrel can have a circular-cylindrical outer contour at the clamping section. The mandrel can have a cross-section with an outer contour that is radially expanded with respect to the guide section. The mandrel can have a recess for a connecting means at the clamping section. The connecting means can be designed and / or can be arranged to provide anti-twist protection.The connecting means can be a screw, in particular a grub screw.

[0025] Corresponding guide sections can be effective between the clamping sleeve and the clamping mandrel. The guide section of the clamping sleeve and the guide section of the clamping mandrel can correspond to each other. The guide section of the clamping sleeve and the guide section of the clamping mandrel can have at least approximately corresponding cross-sectional contours. A clearance fit can be effective between the guide section of the clamping sleeve and the guide section of the clamping mandrel.

[0026] Corresponding stop sections can be effective between the clamping sleeve and the clamping mandrel. The stop section of the clamping sleeve and the stop section of the clamping mandrel can correspond to one another. The stop section of the clamping sleeve and the stop section of the clamping mandrel can have cross-sectional contours that at least partially overlap one another in the radial direction. The stop section of the clamping sleeve and the stop section of the clamping mandrel can be arranged opposite one another and / or parallel to one another. The stop section of the clamping sleeve and the stop section of the clamping mandrel can be designed and / or arranged to enable a predetermined axial positioning of the clamping sleeve on the clamping mandrel when in mutual contact.

[0027] The method is designed to machine, measure, and / or inspect a hollow workpiece with an inner surface. The method can be designed to machine, measure, and / or inspect a toothing or gear, in particular using a rolling test, in particular using a single-flank rolling test. For this purpose, the workpiece is clamped using such a clamping device.

[0028] The invention improves the machining, measuring, and / or testing of a hollow workpiece, both in process and in result. Process reliability is increased. Efforts, such as time, are reduced. A fixture-related runout error is reduced. In-line machining, measuring, and / or testing is enabled.

[0029] In the following, embodiments of the invention are described in more detail with reference to figures, which show schematically and by way of example: Fig. 1 a clamping device with a clamping sleeve and a clamping mandrel and a workpiece arranged on the clamping device with a hollow shaft and a gear, Fig. 2 an arrangement for the rolling test of a workpiece with a hollow shaft and gear using a clamping device with a clamping sleeve and mandrel, Fig. 3 a clamping sleeve of a clamping device for clamping a hollow workpiece in perspective view, Fig. 4 a clamping sleeve of a clamping device for clamping a hollow workpiece in longitudinal section, Fig. 5 a clamping sleeve of a clamping device for clamping a hollow workpiece in front view, Fig. 6 a mandrel of a clamping device for clamping a hollow workpiece in perspective view, Fig. 7 a mandrel of a clamping device for clamping a hollow workpiece in front view, Fig. 8 corresponding round wedge sections of a clamping device in release position and Fig. 9 corresponding round wedge sections of a clamping device in clamping position.

[0030] Fig. 1 shows a clamping device 100 and a workpiece 102 arranged on the clamping device 100. The workpiece 102 has a hollow shaft section 104 with a circular-cylindrical workpiece inner surface and a gear section 106 forming a microgear. The clamping device 100 has a clamping axis 108, a clamping sleeve 110, and a clamping mandrel 112. The clamping sleeve 110 is pushed axially onto the clamping mandrel 112.

[0031] The clamping device 100 is adjustable between a release position and a clamping position by rotating the clamping sleeve 110. In the release position, the workpiece 102 can be pushed axially onto the clamping device 100 with its inner surface or removed from the clamping device 100. Fig. 1 shows the clamping device 100 with a workpiece 102 pushed onto it. In the clamped position, the workpiece 102 is frictionally connected to the clamping device 100. The clamping device 100 is designed such that the frictional connection between the clamping device 100 and the workpiece 102 enables machining, measuring, or testing of the workpiece 102.

[0032] Fig. 2 shows an arrangement 200 for rolling testing a micro gear of a workpiece 204 formed by means of a gear section 202, such as workpiece 102 with gear section 106 according to Fig. 1. For this purpose, the workpiece 204 is clamped to a clamping device 206, such as clamping device 100 according to Fig. 1, clamped. A workpiece 208 with a gear section 210 forming a master gear is clamped with a corresponding clamping device 212. The clamping device 206 with the workpiece 204 and the clamping device 212 with the workpiece 208 are arranged with mutually parallel clamping axes 214, 216 and intermeshing gear sections 202, 210 in a measuring device (not shown in detail here).

[0033] Fig. 3 shows a clamping sleeve 300 of a clamping device, such as clamping device 102 according to Fig. 1 or clamping device 206, 212 according to Fig. 2, for clamping a hollow workpiece, such as workpiece 102 according to Fig. 1 or workpiece 204, 208 according to Fig. 2, in perspective view. Fig. 4 shows the clamping sleeve 300 in longitudinal section. Fig. 5 shows the clamping sleeve 300 in front view.

[0034] The clamping sleeve 300 has a sleeve axis 302, a clamping sleeve outer surface 304, a clamping sleeve inner surface 306, a sleeve section 308, and a head section 310. In the clamping device, the clamping sleeve 300 is arranged with its sleeve axis 302 coaxial with the clamping axis; in this respect, the sleeve axis 302 then corresponds to the clamping axis. The clamping sleeve outer surface 304 serves to hold a workpiece to be clamped on its inner surface. The clamping sleeve inner surface 306 serves to hold a clamping mandrel of the clamping device. At the sleeve section 308, the clamping sleeve 300 has a circular-cylindrical outer contour. At the head section 310, the clamping sleeve 300 has a polygonal outer contour with four sides and rounded transitions that is radially extended with respect to the sleeve section 308 and a circular-cylindrical inner contour that is radially extended with respect to the sleeve section 308.

[0035] The clamping sleeve 300 has clamping sections, such as 312, and slots, such as 314, arranged between the clamping sections 312. The slots 314 run in the extension direction of the sleeve axis 302, are arranged on the sleeve section 308, and extend into the head section 310 to enable radial expansion of the clamping sleeve 300 or radial displacement of the clamping sections 312. On the head section 310, the slots 312 are arranged on the sides of the outer contour and each have a relief bore at the end. Openings, such as 316, are arranged on the head section 310 to enable radial penetration.

[0036] The clamping sleeve 300 has a guide section 318, a first stop section 319 for a workpiece, and a second stop section 320 for a clamping mandrel. The guide section 318 is formed with the inner contour arranged on the head section 310. The first stop section 319 is formed with an annular axial surface on the radial outer contour extension between the sleeve section 318 and the head section 310. The second stop section 320 is formed with an annular axial surface on the radial inner contour extension on the head section 310.

[0037] Fig. 6 shows a mandrel 322 of a clamping device, such as clamping device 102 according to Fig. 1 or clamping device 206, 212 according to Fig. 2, for clamping a hollow workpiece, such as workpiece 102 according to Fig. 1 or workpiece 204, 208 according to Fig. 2, in perspective view. Fig. 7 shows the mandrel 322 in front view.

[0038] The clamping mandrel 322 has a mandrel axis 324, a mandrel section 326, a guide section 328, a clamping section 330, and a stop section 332. In the clamping device, the clamping mandrel 322 is arranged with its mandrel axis 324 coaxial with the clamping axis, so that the mandrel axis 324 then corresponds to the clamping axis. At the guide section 328, the clamping mandrel 322 has a circular-cylindrical outer contour that is radially expanded with respect to the mandrel section 326. At the clamping section 330, the clamping mandrel 322 has a circular-cylindrical outer contour that is radially expanded with respect to the guide section 328. The stop section 332 is formed with an annular axial surface at the radial inner contour extension between the mandrel section 326 and the guide section 328. A wedge-shaped recess 334 is arranged on the clamping section 330.The clamping section 330 serves to firmly clamp the mandrel 322 in a chuck of a processing machine or a measuring and / or testing device.

[0039] The clamping sleeve 300 has four first round wedge sections, such as 336. The first round wedge sections 336 are arranged on the clamping sleeve inner surface 306 on the clamping sections 312 and extend axially over the entire sleeve section 308 into the head section 310. The clamping mandrel 322 has four second round wedge sections, such as 338. The second round wedge sections 338 are arranged on the clamping mandrel outer surface and extend axially over the entire mandrel section 326. When the clamping sleeve 300 is pushed onto the clamping mandrel 322, the first round wedge sections 336 and the second round wedge sections 338 correspond to one another, so that the clamping device can be adjusted between the release position and the clamping device by rotating the clamping sleeve 300 about the sleeve axis 302 or the clamping axis.

[0040] Fig. 8 shows the corresponding round wedge sections 336, 338 of the clamping device in the release position in a developed view. Fig. 9 shows the corresponding round wedge sections 336, 338 of the clamping device in the clamping position in a developed view.

[0041] The first round wedge sections 336 arranged on the clamping sleeve 300 and the second round wedge sections 338 arranged on the clamping mandrel 322 are geometrically complementary to one another and each have a wedge surface that constantly rises or falls in the circumferential direction. At the round wedge sections 336, 338, the clamping sleeve 300 and the clamping mandrel 322 each have a minimum radius r2, a maximum radius r1, and a taper length l. k This makes the clamping device self-locking in the clamping position and easy to release.

[0042] To clamp a workpiece, the clamping sleeve 300 is pushed onto the clamping mandrel 322 until the second stop section 320 of the clamping sleeve 300 and the stop section 332 of the clamping mandrel 322 abut one another, and the workpiece is pushed onto the first stop section 320 of the clamping sleeve 300. The clamping sleeve 300 is then rotated in the clamping direction 340, whereby the interaction of the round wedge sections 336, 338 causes the clamping sleeve 300 to expand and clamp the workpiece. To release the workpiece, the clamping sleeve 300 is rotated in the release direction, whereby a clamping force is eliminated and the clamping sleeve 300 automatically assumes its original shape.

[0043] According to a specific embodiment, the clamping sleeve 300 has an outer radius r on the sleeve portion 308 in the release position. a of 1.37mm, with the minimum radius r2 1 mm, the maximum radius r1 1.08mm and the cone length l k1.185 mm, corresponding to an angle of 68.5°. In the clamping position, this specific clamping sleeve 300 has an outer radius r on the sleeve section 308 a of 1.39mm, whereby to adjust between the release position and the clamping position it is necessary to turn the clamping sleeve 300 by 5°.

[0044] "May" refers in particular to optional features of the invention. Accordingly, there are also further developments and / or embodiments of the invention that additionally or alternatively comprise the respective feature(s).

[0045] If necessary, features can also be selected from the combinations of features disclosed in the description and used alone or in combination with other features to define the subject matter of the claim, dissolving any structural and / or functional connection that may exist between the features. Reference symbol 100 clamping device 102 Workpiece 104 Hollow shaft section 106 Gear section 108 clamping axle 110 clamping sleeve 112 mandrel 200 Arrangement for rolling test 202 Gear section 204 Workpiece 206 clamping device 208 Workpiece 210 Gear section 212 clamping device 214 clamping axle 216 clamping axle 300 clamping sleeve 302 sleeve axis 304 clamping sleeve outer surface 306 clamping sleeve inner surface 308 case section 310 head section 312 tension section 314 slot 316 Opening 318 Guide Section 319 first stop section 320 second stop section 322 mandrel 324 mandrel axis 326 mandrel section 328 guide section 330 clamping section 332 stop section 334 recess 336 first round wedge section 338 second round wedge section 340 clamping direction r a Outer radius r2 minimum radius r1 maximum radius l k Cone length QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 24 05 527 A1

[0002] DE 199 31 861 A1

[0003]

Claims

[1] Clamping device (100, 206) for clamping a hollow workpiece (102, 204, 208) with a workpiece inner surface, the clamping device (100, 206) having a clamping axis (108, 214, 216), a radially expandable clamping sleeve (110, 300) with a clamping sleeve outer surface (304) assigned to the workpiece inner surface and a clamping sleeve inner surface (306) and a clamping mandrel (112, 322) with a clamping mandrel outer surface assigned to the clamping sleeve inner surface (306) for radially expanding the clamping sleeve (110, 300), characterized by that the clamping device (100, 206) is adjustable relative to one another between a release position and a clamping position by rotating the clamping sleeve (110, 300) and the clamping mandrel (112, 322) about the clamping axis (108, 214, 216). [2] Clamping device (100, 206) according to claim 1, characterized by that between the clamping sleeve (110, 300) and the clamping mandrel (112, 322) corresponding round wedge sections (336, 338) are effective. [3] Clamping device (100, 206) according to at least one of the preceding claims, characterized by that the clamping sleeve (110, 300) has first round wedge sections (336) arranged on the clamping sleeve inner surface (306) and the clamping mandrel (112, 322) has second round wedge sections (338) arranged on the clamping mandrel outer surface. [4] Clamping device (100, 206) according to at least one of claims 2 to 3, characterized by that the round wedge sections (336, 338) each have a cone ratio 15≥C≥110 have. [5] Clamping device (100, 206) according to at least one of the preceding claims, characterized by that the clamping sleeve (110, 300) has a sleeve section (308) with clamping sections (312) and slots (314) arranged between the clamping sections (312). [6] Clamping device (100, 206) according to at least one of claims 2 to 4 and according to claim 5, characterized bythat the first round wedge sections (336) are arranged on the clamping sections (312). [7] Clamping device (100, 206) according to at least one of the preceding claims, characterized by that mutually corresponding guide sections (318, 328) and / or mutually corresponding stop sections (320, 332) are effective between the clamping sleeve (110, 300) and the clamping mandrel (112, 322). [8] Clamping device (100, 206) according to at least one of the preceding claims, characterized by that the clamping sleeve (110, 300) has a head section (310) and a guide section (318) arranged on the head section (310), a first stop section (319) arranged between the guide section (318) and the head section (310) and / or a second stop section (320) arranged on the head section (310). [9] Clamping device (100, 206) according to at least one of the preceding claims, characterized bythat the mandrel (112, 322) has a mandrel section (326), a guide section (328) and a clamping section (330). [10] Clamping device (100, 206) according to at least one of the preceding claims, characterized by that the mandrel (112, 322) has a stop section (332) arranged between the mandrel section (326) and the guide section (328). [11] Method for machining, measuring and / or testing a hollow workpiece (102, 204, 208) having an inner workpiece surface, characterized by that the workpiece (102, 204, 208) is clamped by means of a clamping device (100, 206) according to at least one of the preceding claims.

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