Clamping device for clamping a tool or a workpiece

Abstract

A chucking device has a body with a bore extending from a rear end to a front end. The bore has a fastening region proximate the rear end, a front end axial abutment surface, and a middle axial abutment surface. A centering sleeve is disposed in the bore and extends axially between a first axial end of the centering sleeve and a second axial end of the centering sleeve. A guide sleeve is disposed in the bore and partially disposed in the centering sleeve. The guide sleeve extends axially between a first axial end of the guide sleeve and a second axial end of the guide sleeve. A locking member is removably disposed in the fastening region, has a tapered abutment surface, and faces the front end. The centering sleeve is axially retained by and between the tapered abutment surface and the middle axial abutment surface. The guide sleeve is axially retained by the tapered abutment surface and the middle axial abutment surface.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of U.S. Provisional Patent Application Serial No. 62 / 985,523, filed on March 5, 2020, which is incorporated herein by reference in its entirety. Technical Field

[0003] The present invention relates to a clamping device for clamping tools or workpieces, and more particularly to a clamping device having a body and a guide sleeve, the body having a centering sleeve disposed therein, the guide sleeve being disposed in the body and a portion thereof. Background Technology

[0004] A chuck is a device with two or more "jaws" on which an object, such as a tool or workpiece, can be placed, forming a collar around the object. The jaws of the chuck are configured to tighten around the object and apply a clamping force. In one type of chuck, the tightening of the jaws can be influenced by a suitable mechanism that pushes around the circumference of the chuck. In another type of chuck, called a pull-in chuck, the chuck is tapered and pulled into a sleeve to tighten the jaws around the tool or workpiece. Chucks are typically made of steel, which allows the jaws to be flexible enough relative to each other to facilitate the tightening of the tool or workpiece.

[0005] In either type, the chuck is held in a clamping device connected to a rotatable shaft, which in turn rotates the tool or workpiece. When the tool is clamped in the chuck and rotated, the tool engages with or is engaged with the workpiece. When the workpiece is clamped in the chuck and rotated, the workpiece engages with or is engaged with the tool.

[0006] The rotational accuracy of a tool or workpiece affects the process of removing chips from the workpiece. Specifically, the rotational accuracy of a tool or workpiece typically depends on concentricity along the axis of rotation. Once clamped in a machine tool such as a lathe or grinder, the tool or workpiece is adjusted to achieve concentricity during rotation. During rotation, concentricity achieved by mechanical clamping is often insufficient or compromised, resulting in runout, which adversely affects the finished workpiece. Concentricity is frequently adjusted multiple times during machine tool operation. For example, some guide sleeves of guide chucks introduce additional runout because they cannot be precisely ground into place within the body. Additionally, some guide sleeves are made of materials that tend to flex during use. Furthermore, some guide sleeves are held in place only by friction and tend to move undesirably toward the front end of the body when the chuck is removed from the guide sleeve. Moreover, some prior art clamping systems require separate centering sleeves and / or guide sleeves for each size of chuck, which increases setup time. Summary of the Invention

[0007] This invention discloses a clamping device for clamping tools or workpieces. The clamping device includes a body having a stepped bore extending from a rear end to a front end of the body. The stepped bore has a fastening region near the rear end. A front axially abutting surface faces the rear end axially, and a middle axially abutting surface faces the rear end axially. The middle axially abutting surface is axially located between the fastening region and the front axially abutting surface. The middle axially abutting surface is radially outward relative to the front axially abutting surface. A centering sleeve is disposed in the stepped bore. The centering sleeve extends axially between a first axial end and a second axial end of the centering sleeve. A guide sleeve is disposed in the stepped bore and partially disposed in the centering sleeve. The guide sleeve extends axially between a first axial end and a second axial end of the guide sleeve. A locking member is removably disposed in the fastening region. The locking member has a tapered abutting surface formed thereon and facing the front end of the body. The centering sleeve is axially fixed between the tapered abutment surface and the central axial abutment surface. The guide sleeve is axially fixed between the tapered abutment surface and the central axial abutment surface.

[0008] In some embodiments, the tapered abutment surface of the centering sleeve extends from the second axial end of the centering sleeve toward the end of the outer surface of the centering sleeve and terminates at the end of the outer surface of the centering sleeve. The tapered abutment surface of the centering sleeve engages with the tapered abutment surface of the locking member.

[0009] In some embodiments, the tapered abutment surface of the guide sleeve extends from the second axial end of the guide sleeve toward the outer surface of the guide sleeve and terminates at the outer surface of the guide sleeve. The tapered abutment surface of the guide sleeve engages with the tapered abutment surface of the locking member.

[0010] In some embodiments, the guide sleeve includes a lip that extends axially from a first axial end of the guide sleeve toward a second axial end of the guide sleeve and terminates at a guide sleeve axial biasing unit receiving surface. The guide sleeve axial biasing unit receiving surface faces the first axial end of the guide sleeve.

[0011] In some embodiments, a first biasing member receiving portion is axially formed between the guide sleeve axial biasing unit receiving surface and the front end axial abutment surface. The first biasing member receiving portion is defined by a radially outward-facing surface of a lip. A first biasing member is disposed in the first biasing member receiving portion. The first biasing member engages with the guide sleeve axial biasing unit receiving surface and the front end axial abutment surface. The first biasing member pushes the guide sleeve toward the locking member tapered abutment surface, such that the guide sleeve tapered abutment surface engages with the locking member tapered abutment surface.

[0012] In some embodiments, the centering sleeve includes a generally cylindrical exterior extending from a first axial end of the centering sleeve to a radially outwardly projecting centering sleeve flange. The centering sleeve flange has a centering sleeve axial biasing unit receiving surface facing the first axial end of the centering sleeve. A second biasing member receiving portion is axially formed between the centering sleeve axial biasing unit receiving surface and a rear axial abutment surface. A second biasing unit is disposed in the second biasing member receiving portion. The second biasing unit engages the centering sleeve axial biasing unit receiving surface and the rear axial abutment surface. The second biasing unit pushes the centering sleeve away from the rear axial abutment surface, such that the tapered abutment surface of the centering sleeve engages with the tapered abutment surface of the locking member.

[0013] In some embodiments, the stepped bore of the body includes a conical body tapered portion that extends outward toward the front end. The conical body tapered portion is configured to receive a tool holding portion of a chuck. The tool holding portion has a tapered outer surface configured to frictionally engage with the conical body tapered portion.

[0014] In some embodiments, the stepped bore of the body includes a recess near the front end. An annular insert is disposed in the recess and has a tapered inner surface formed on a portion of the annular insert. The tapered inner surface is configured to receive a tool holding portion of a chuck. The tool holding portion has a tapered outer surface configured to engage with the tapered inner surface.

[0015] In some embodiments, the annular insert is made of a carbide-based material.

[0016] In some embodiments, the first axial end of the guide sleeve is spaced apart from the tapered outer surface in a direction along the elongated cylindrical portion away from the front end and toward the rear end. Attached Figure Description

[0017] Figure 1A This is a cross-sectional view of the clamping device of the present invention.

[0018] Figure 1B yes Figure 1A A magnified view of the details of the clamping device, 1B.

[0019] Figure 1C yes Figure 1A A magnified view of the details of the clamping device, 1C.

[0020] Figure 2A This is a cross-sectional view of the clamping device of the present invention, showing a front insert.

[0021] Figure 2B yes Figure 2A A magnified view of the details of the clamping device, 2B. Detailed Implementation

[0022] like Figure 1A, Figure 1B and Figure 1C As shown, the clamping device of the present invention is identified by the number 2000. (As indicated...) Figure 1A As shown, the clamping device 2000 includes a body 2100 having a stepped hole 2100X extending from its rear end 2100B to its front end 2100F. The stepped hole 2100X has a conical body tapered portion 2100T near the front end 2100F. The stepped hole 2100X has a first cylindrical inner surface 2100X1 near the conical body tapered portion 2100T and has a first inner diameter D21. The stepped hole 2100X has a second cylindrical inner surface 2100X2 near the first cylindrical inner surface 2100X1 and radially outward relative to the first cylindrical inner surface 2100X1. The second cylindrical inner surface 2100X2 has a second inner diameter D22. The stepped hole 2100X has a third cylindrical inner surface 2100X3, which is adjacent to and radially outward relative to the second cylindrical inner surface 2100X2. The third cylindrical inner surface 2100X3 has a third inner diameter D23. The stepped hole 2100X has a fourth cylindrical inner surface 2100X4, which is adjacent to and radially outward relative to the third cylindrical inner surface 2100X3. The fourth cylindrical inner surface 2100X4 has a fourth inner diameter D24. The stepped hole 2100X has a fastening region 2100X5, which is a cylindrical inner surface axially located between the fourth cylindrical inner surface 2100X4 and the rear end 2100B of the body. The fastening region 2100X5 is radially outward relative to the fourth cylindrical inner surface 2100X4 and has a fifth inner diameter D25. A portion of the fastening region 2100X5 has an internal thread formed thereon. The stepped hole 2100X is symmetrical about its longitudinal axis L.

[0023] like Figure 1A As shown, the second cylindrical inner surface 2100X2 is located axially between the first cylindrical inner surface 2100X1 and the third cylindrical inner surface 2100X3. The third cylindrical inner surface 2100X3 is located axially between the second cylindrical inner surface 2100X2 and the fourth cylindrical inner surface 2100X4. The fourth cylindrical inner surface 2100X4 is located axially between the third cylindrical inner surface 2100X3 and the fastening area 2100X5. The first inner diameter D21 is smaller than the second inner diameter D22. The third inner diameter D23 is larger than the second inner diameter D22. The third inner diameter D23 is larger than the first inner diameter D21. The fourth inner diameter D24 is larger than the third inner diameter D23. The fifth inner diameter D25 is larger than the fourth inner diameter D24.

[0024] like Figure 1A As shown, the front axial abutment surface 2102 axially faces the rear end 2100B of the body 2100. The front axial abutment surface 2102 is annular and extends radially between the first cylindrical inner surface 2100X1 and the second cylindrical inner surface 2100X2 of the stepped hole 2100X. The middle axial abutment surface 2103 axially faces the rear end 2100B of the body 2100. The middle axial abutment surface 2103 is annular and extends radially between the second cylindrical inner surface 2100X2 and the third cylindrical inner surface 2100X3 of the stepped hole 2100X. The rear axial abutment surface 2104 axially faces the rear end 2100B of the body 2100. The rear axial abutment surface 2104 is annular and extends between the third cylindrical inner surface 2100X3 and the fourth cylindrical inner surface 2100X4 of the stepped hole 2100X. The middle axial abutment surface 2103 is located axially between the front axial abutment surface 2102 and the rear end 2100B. Specifically, the middle axial abutment surface 2103 is located axially between the front axial abutment surface 2102 and the rear axial abutment surface 2104, and is radially outward relative to the front axial abutment surface 2102. The front axial abutment surface 2102 is spaced apart from the conical portion 2100T of the conical body by a first cylindrical inner surface 2100X1.

[0025] like Figure 1A As shown, the centering sleeve 2300 is positioned near the third cylindrical inner surface 2100X3 of the stepped hole 2100X. The centering sleeve 2300 has a first axial end 2300A and a second axial end 2300B. When the second biasing unit 2800 is compressed, causing the centering sleeve 2300 to move toward the front end 2100F, the first axial end 2300A of the centering sleeve engages with the central axially adjacent surface 2103; and when the second biasing unit 2800 expands, the centering sleeve 2300 moves toward the rear end 2100B, and the first axial end 2300A of the centering sleeve is spaced apart from the central axially adjacent surface 2103 by a gap G13. The conical abutment surface 2300C of the centering sleeve extends from the second axial end 2300B of the centering sleeve toward the end 2300X of the outer surface 2300E of the centering sleeve and terminates at the end 2300X of the outer surface 2300E of the centering sleeve. The conical abutment surface 2300C of the centering sleeve is tapered in the direction toward the first axial end 2300A of the centering sleeve. The centering sleeve 2300 has an inner surface 2300D and an outer surface 2300E, both extending between its first axial end 2300A and second axial end 2300B of the centering sleeve.

[0026] like Figure 1A and Figure 1BAs shown, the inner surface 2300D of the centering sleeve 2300 has a generally cylindrical portion 2300K extending from the first axial end 2300A of the centering sleeve to a radially inwardly projecting protrusion 2300L. The protrusion 2300L extends from the first axially adjacent surface 2300L1 to the second axial end 2300B of the centering sleeve.

[0027] The outer surface 2300E of the centering sleeve 2300 has a generally cylindrical outer portion 2300J extending from the first axial end 2300A of the centering sleeve to a radially outwardly projecting centering sleeve flange 2300F. The outer diameter of the cylindrical portion 2300J is slightly smaller than the third inner diameter D23 of the body 2100. The outer diameter of the centering sleeve flange 2300F is slightly smaller than the fourth inner diameter D24 of the body 2100, thereby forming an annular gap G14 between the centering sleeve 2300 and the body 2100. The centering sleeve flange 2300F has a centering sleeve axial offset unit receiving surface 2300Q facing the first axial end 2300A of the centering sleeve.

[0028] like Figure 1A As shown, guide sleeve 2200 extends from its first axial end 2200A to its second axial end 2200B. Guide sleeve 2200 is disposed within body 2100, wherein the first axial end 2200A is spaced from the front end 2100F of body 2100, and a portion of guide sleeve 2200 near the second axial end 2200B is disposed within centering sleeve 2300. Guide sleeve 2200 has a first radial thickness R21 along the portion of first segment 2200E near the first axial end 2200A (see...). Figure 1C ).like Figure 1B As shown, the guide sleeve 2200 has a third radial thickness R23 along the third segment 2200G near the second axial end 2200B of the guide sleeve. The guide sleeve 2200 has a second radial thickness R22 along the second segment 2200F1 located between the first segment 2200E and the third segment 2200G. The guide sleeve 2200 has a fourth radial thickness R24 (see figure) along the fourth segment 2200K (shown by bracket 2200F2) located between the first segment 2200E and the second segment 2200F1. Figure 1A The fourth segment 2200K terminates at the guide sleeve mid-section limiter 2200KA, which faces the front end 2100F axially. The tapered abutment surface 2200C of the guide sleeve extends from the second axial end 2200B of the guide sleeve toward the outer surface 2200X of the guide sleeve of the third segment 2200G of the guide sleeve 2200 and terminates at the outer surface 2200X of the guide sleeve. The tapered abutment surface 2200C of the guide sleeve is tapered in the direction toward the first axial end 2200A of the guide sleeve.

[0029] like Figure 1CAs shown, the first segment 2200E of the guide sleeve 2200 has a lip 2200L facing the first axial end 2200A of the guide sleeve 2200. The lip 2200L extends axially from the first axial end 2200A of the guide sleeve toward the second axial end 2200B of the guide sleeve and terminates at the guide sleeve axial biasing unit receiving surface 2204 of the guide sleeve 2200.

[0030] like Figure 1C As shown, a first biasing member receiving portion 2200P is axially formed between the guide sleeve axial biasing unit receiving surface 2204 and the front end axial abutment surface 2102. The first biasing member receiving portion 2200P is defined by the radially outward-facing surface 2200L1 of the lip 2200L. A first biasing member 2700 (e.g., one or more helical springs, one or more inclined helical springs, disc spring assemblies, combinations thereof, etc.) is disposed in the first biasing member receiving portion 2200P. The first biasing member 2700 engages the guide sleeve axial biasing unit receiving surface 2204 and the front end axial abutment surface 2102. The first biasing member 2700 pushes the guide sleeve 2200 away from the front axial abutment surface 2102, away from the middle axial abutment surface 2103, and towards the tapered abutment surface 2400C of the locking member, causing the tapered abutment surface 2200C of the guide sleeve to engage with the tapered abutment surface 2400C of the locking member. A first axial gap G10 is formed between the front axial abutment surface 2102 and the first axial end 2200A of the guide sleeve, and a second axial gap G12 is formed between the middle axial abutment surface 2103 and the middle limiter 2200KA of the guide sleeve. When the biasing member 2700 is compressed, the guide sleeve moves towards the front end 2100F, and the front axial abutment surface 2102 engages the first axial end 2200A of the guide sleeve, and / or the middle axial abutment surface 2103 engages the middle limiter 2200KA of the guide sleeve. Figure 1A and Figure 1C In the depicted embodiment, two first biasing members 2700 are disposed in the first biasing member receiving portion 2200P.

[0031] The guide sleeve 2200 is inserted into the body 2100 via the rear end 2100B, which facilitates assembly and provides greater functional safety because the guide sleeve 2200 cannot slide out of the body 2100 when the chuck 2500 is moved forward. Once the guide sleeve 2200 has moved a small distance forward toward the front end 2100F, the guide sleeve 2200 is stopped by the front axial abutment surface 2102 in the body 2100.

[0032] like Figure 1A and Figure 1BAs shown, a locking member (e.g., a nut with external threads) 2400 is disposed (e.g., screwed into) a fastening region 2100X5 of the body 2100. The fastening region 2100X5 has internal threads formed on a portion thereof. The locking member 2400 includes external threads 2400X that screw into the internal threads formed in the fastening region 2100X5 of the body 2100. The locking member 2400 includes a locking member tapered abutment surface 2400C that engages with a centering sleeve tapered abutment surface 2300C of a centering sleeve 2300 to axially secure the centering sleeve 2300 between the locking member 2400 and the body 2100. The locking member 2400 has an axially inwardly facing limiting stop 2400Y, which abuts against the second end 2100B of the body 2100 to limit the axial movement of the locking member 2400 in the direction toward the front end 2100F. Since both the guide sleeve tapered abutment surface 2200C and the centering sleeve tapered abutment surface 2300C engage with the locking member tapered abutment surface 2400C, improved protection is achieved against contamination of the interior of the clamping device 2000 by dust, liquids, dirt, and other contaminants.

[0033] like Figure 1A , Figure 1B and Figure 1C As shown, a chuck 2500 is disposed in the body 2100. The chuck 2500 has a tool holding portion 2500H, which has a tapered outer surface 2500T and transitions to an elongated cylindrical portion 2500L. The chuck 2500 includes a longitudinally extending slot 2500X that extends from and axially through the tool holding portion 2500H and terminates at a middle portion 2500K of the elongated cylindrical portion 2500L. The tapered outer surface 2500T of the tool holding portion 2500H engages with the tapered portion 2100T of the conical body of the body 2100. The outer surface of the elongated cylindrical portion 2500L is radially spaced from the first segment 2200E. The elongated cylindrical portion 2500L is radially guided by the second segment 2200F1 of the guide sleeve 2200. The second segment 2200F1 and the fourth segment 2200K (shown by the bracket 2200F2) are centered by the inner surface of the cylindrical portion 2300K of the centering sleeve 2300. Therefore, the centering sleeve 2300 is sized to be used with various sizes of collets 2500 and guide sleeves 2200 without requiring replacement of the centering sleeve 2300 for each different size collet 2500 and guide sleeve 2200. Figure 1A , Figure 1B and Figure 1CIn the depicted embodiment, the first axial end 2200A of the guide sleeve is spaced apart from the tapered outer surface 2500T in a direction along the elongated cylindrical portion 2500L away from the front end 2100F and toward the rear end 2100B.

[0034] like Figure 1B As shown, a second biasing member receiving portion 2300P is axially formed between the centering sleeve axial biasing unit receiving surface 2300Q and the rear axial abutment surface 2104 of the centering sleeve flange 2300F. A second biasing unit 2800 (e.g., one or more helical springs, one or more inclined helical springs, disc spring assemblies, combinations thereof, etc.) is disposed in the second biasing member receiving portion 2300P. The second biasing unit 2800 engages with the centering sleeve axial biasing unit receiving surface 2300Q and the rear axial abutment surface 2104. The second biasing unit 2800 pushes the centering sleeve 2300 away from the rear axial abutment surface 2104 and towards the locking member tapered abutment surface 2400C, such that the centering sleeve tapered abutment surface 2300C engages with the locking member tapered abutment surface 2400C, and a gap G13 is formed between the middle axial abutment surface 2103 and the first axial end 2300A of the centering sleeve. When the second biasing unit 2800 is compressed, the centering sleeve 2300 moves toward the front end 2100F, and the first axial end 2300A of the centering sleeve engages the central axially adjacent surface 2103.

[0035] like Figure 1A As shown, two of the six circumferentially equidistant radial holes 43 extending through the body 2100 are illustrated. Threaded inserts 45 are disposed in each of the six radial holes, engaged, for example, by threaded engagement or press-fit. Differential screws 44 are located in each corresponding threaded insert 45 in the body 2100. Each differential screw 44 is connected to a corresponding adjusting carriage 38 to facilitate adjustment of the chuck 2500 held in the clamping device 2000. Each adjusting carriage 38 is situated in a corresponding hole in the centering sleeve 2300. The differential screws 44 are generally equidistantly positioned around the circumference of the body 2100. The adjusting carriages 38 can be adjusted by tightening or loosening the differential screws 44 using tools such as screwdrivers or hex wrenches to center and stabilize the chuck 2500 within the body 2100. The guide sleeve 2200 is elastically and radially deformed (e.g., in the micrometer range) by the force applied by the differential screw 44 via the adjusting slide 38, thereby reducing the clearance relative to the hole of the clamping device 2000 and thus improving repeatability.

[0036] like Figure 2A and Figure 2B As shown, the clamping device 3000 is similar to Figure 1A , Figure 1B and Figure 1CThe clamping device 2000 is shown. Therefore, the component numbers of the parts of the clamping device 3000 are identified by similar component numbers as those used for the clamping device 2000, where the first digit "2" is replaced by the digit "3". The clamping device 3000 includes a body 3100 having a stepped hole 3100X extending from its rear end 3100B through it to its front end 3100F. The stepped hole 3100X has a recess 3100P near the front end 3100F, which replaces the conical tapered portion 2100T of the conical body in the clamping device 2000. An annular insert 3600 is disposed (e.g., press-fitted into) the recess 3100P. The annular insert 3600 has a tapered inner surface 3600T formed on a portion thereof. The annular insert 3600 is an alternative embodiment modifying the clamping device 2000. The annular insert 3600 is made of materials such as carbides to increase stiffness and reduce runout.

[0037] Although detailed embodiments of the invention have been shown and described, those skilled in the art will understand that various changes can be made and equivalents can be substituted for elements of the invention without departing from the scope of the invention. Furthermore, modifications can be made to adapt specific situations or materials to the teachings of the invention without departing from its essential scope. Therefore, the invention is not intended to be limited to the specific embodiments disclosed in the foregoing detailed description, but rather to include all embodiments falling within the scope of the appended claims.

Claims

1. A clamping device for holding tools or workpieces, characterized in that, The clamping device includes: The body has a stepped hole extending from its rear end to its front end. The stepped hole has a fastening area near the rear end, a front axially abutting surface axially facing the rear end, and a middle axially abutting surface axially facing the rear end and located axially between the fastening area and the front axially abutting surface. The middle axially abutting surface is radially outward relative to the front axially abutting surface. A centering sleeve is provided in a stepped hole, and the centering sleeve extends axially between the first axial end of the centering sleeve and the second axial end of the centering sleeve. A guide sleeve is disposed in the stepped hole and partially disposed in the centering sleeve, and the guide sleeve extends axially between the first axial end of the guide sleeve and the second axial end of the guide sleeve. A locking member is removably disposed in the fastening area, the locking member having a tapered abutment surface formed thereon and facing the front end of the body; The centering sleeve is axially fixed between the tapered abutment surface and the central axial abutment surface; and The guide sleeve is axially fixed by the tapered abutment surface and the central axial abutment surface.

2. The clamping device according to claim 1, characterized in that, The conical abutment surface of the centering sleeve extends from the second axial end of the centering sleeve toward the end of the outer surface of the centering sleeve and terminates at the end of the outer surface of the centering sleeve; the conical abutment surface of the centering sleeve engages with the conical abutment surface of the locking member.

3. The clamping device according to claim 1, characterized in that, The tapered abutment surface of the guide sleeve extends from the second axial end of the guide sleeve toward the outer surface of the guide sleeve and terminates on the outer surface of the guide sleeve; and The tapered abutment surface of the guide sleeve engages with the tapered abutment surface of the locking member.

4. The clamping device according to claim 1, characterized in that, The guide sleeve includes: The lip extends axially from the first axial end of the guide sleeve toward the second axial end of the guide sleeve and terminates at the guide sleeve axial offset unit receiving surface of the guide sleeve, the guide sleeve axial offset unit receiving surface facing the first axial end of the guide sleeve. A first biasing member receiving portion is axially formed between the axial biasing unit receiving surface of the guide sleeve and the axially adjacent front end surface, the first biasing member receiving portion being defined by the radially outward-facing surface of the lip; and A first biasing member is disposed in a first biasing member receiving portion. The first biasing member engages with the receiving surface of the axial biasing unit of the guide sleeve and the front axial adjacent surface. The first biasing member pushes the guide sleeve toward the tapered adjacent surface of the locking member, so that the tapered adjacent surface of the guide sleeve engages with the tapered adjacent surface of the locking member.

5. The clamping device according to claim 1, characterized in that, The centering sleeve includes: The generally cylindrical exterior extends from the first axial end of the centering sleeve to a radially outwardly projecting centering sleeve flange; the centering sleeve flange has a centering sleeve axial offset unit receiving surface facing the first axial end of the centering sleeve. The second biasing member receiving portion is axially formed between the receiving surface of the axial biasing unit of the centering sleeve and the rear axial adjacent surface. The second biasing unit is disposed in the receiving part of the second biasing member. The second biasing unit engages the receiving surface of the axial biasing unit of the centering sleeve and the rear axial adjacent surface. The second biasing unit pushes the centering sleeve away from the rear axial adjacent surface, so that the conical adjacent surface of the centering sleeve engages with the conical adjacent surface of the locking member.

6. The clamping device according to claim 1, characterized in that, The stepped hole of the main body includes a conical body tapered portion that extends outward toward the front end. The conical body tapered portion is configured to receive a tool holding portion of the chuck. The tool holding portion has a tapered outer surface configured to frictionally engage with the conical body tapered portion.

7. The clamping device according to claim 1, characterized in that, The stepped hole of the main body includes a recess near the front end, and an annular insert is disposed in the recess. The annular insert has a tapered inner surface formed on a portion thereof, the tapered inner surface being configured to receive a tool holding portion of the chuck, the tool holding portion having a tapered outer surface.

8. The clamping device according to claim 7, characterized in that, The annular insert comprises a carbide material.

9. The clamping device according to claim 6, characterized in that, The first axial end of the guide sleeve is spaced apart from the tapered outer surface in a direction along the elongated cylindrical portion away from the front end and toward the rear end.

10. The clamping device according to claim 7, characterized in that, The first axial end of the guide sleeve is spaced apart from the tapered outer surface in a direction along the elongated cylindrical portion away from the front end and toward the rear end.

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