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CN-113352111-B - Clamping device for clamping tools or workpieces

CN113352111BCN 113352111 BCN113352111 BCN 113352111BCN-113352111-B

Abstract

A clamping device having a body with a bore extending from a rear end to a front end thereof. The bore has a fastening region near 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 centering sleeve first axial end and a centering sleeve second axial end. The guide sleeve is disposed in the bore and partially disposed in the centering sleeve. The guide sleeve extends axially between a guide sleeve first axial end and a guide sleeve second axial end. A locking member is removably disposed in the fastening region, having a tapered abutment surface and facing the front end. The centering sleeve is axially retained by and between the tapered abutment surface and the mid-axial abutment surface. The guide sleeve is axially retained by the tapered abutment surface and the intermediate axial abutment surface.

Inventors

  • Rene Moski

Assignees

  • 肖柏林股份有限公司

Dates

Publication Date
20260512
Application Date
20210305
Priority Date
20200305

Claims (10)

  1. 1. A clamping device for clamping a tool or workpiece, the clamping device comprising: A body having a stepped bore extending from a rear end thereof to a front end, the stepped bore having a fastening region proximate the rear end, a front end axial abutment surface axially facing the rear end, and a middle axial abutment surface axially facing the rear end and axially located between the fastening region and the front end axial abutment surface, the middle axial abutment surface being radially outward relative to the front end axial abutment surface; A centering sleeve disposed in the stepped bore, the centering sleeve extending axially between a first axial end of the centering sleeve and a second axial end of the centering sleeve; a guide sleeve disposed in the stepped bore and partially disposed in the centering sleeve, the guide sleeve extending axially between a guide sleeve first axial end and a guide sleeve second axial end; A locking member removably disposed in the fastening region, the locking member having a tapered abutment surface formed thereon and facing the front end of the body; The centering sleeve being axially retained by and between the tapered abutment surface and the mid-axial abutment surface, and The guide sleeve is axially retained by the tapered abutment surface and the intermediate axial abutment surface.
  2. 2. The clamping device as recited in claim 1, characterised in that the centering sleeve tapered abutment surface extends from the centering sleeve second axial end towards and terminates at the centering sleeve outer surface end, the centering sleeve tapered abutment surface engaging the tapered abutment surface of the locking member.
  3. 3. The clamping device as claimed in claim 1, characterized in that the guide sleeve conical abutment surface extends from the guide sleeve second axial end towards and ends at the guide sleeve outer surface of the guide sleeve, and in that The guide sleeve tapered abutment surface engages the tapered abutment surface of the locking member.
  4. 4. Clamping device according to claim 1, characterized in that the guide sleeve comprises: a lip extending axially from the guide sleeve first axial end toward the guide sleeve second axial end and terminating in a guide sleeve axial biasing unit receiving surface of the guide sleeve, the guide sleeve axial biasing unit receiving surface facing the guide sleeve first axial end; A first biasing member receiver axially formed between the guide sleeve axial biasing unit receiving surface and the forward end axial abutment surface, the first biasing member receiver defined by a radially outwardly facing surface of the lip, and A first biasing member disposed in the first biasing member receiver, the first biasing member engaging the guide sleeve axial biasing unit receiving surface and the front end axial abutment surface; and the first biasing member urges the guide sleeve toward the locking member tapered abutment surface such that the guide sleeve tapered abutment surface engages the locking member tapered abutment surface.
  5. 5. The clamping device as recited in claim 1, characterised in that the centering sleeve comprises: A generally cylindrical outer portion extending from the centering sleeve first axial end to a radially outwardly projecting centering sleeve flange having a centering sleeve axial biasing unit receiving surface facing the centering sleeve first axial end; A second biasing member receiver axially formed between the centering sleeve axial biasing unit receiving surface and the rear end axial abutment surface; The second biasing unit pushes the centering sleeve away from the rear end axial abutment surface such that the centering sleeve tapered abutment surface engages the locking member tapered abutment surface.
  6. 6. The clamping device of claim 1, wherein the stepped bore of the body includes a conical body taper that flares outwardly toward the front end, the conical body taper configured to receive a tool-holding portion of the collet, the tool-holding portion having a tapered outer surface configured to frictionally engage the conical body taper.
  7. 7. The clamping device of claim 1, wherein the stepped bore of the body includes a recess proximate the front end, and an annular insert is disposed in the recess, the annular insert having a tapered inner surface formed on a portion thereof, the tapered inner surface configured to receive a tool holding portion of the collet, the tool holding portion having a tapered outer surface.
  8. 8. The clamping device of claim 7, wherein the annular insert comprises a carbide material.
  9. 9. The clamping device as recited in claim 6, characterised in that the guide sleeve first axial end is spaced from the tapered outer surface in a direction along the elongate cylindrical portion away from the front end and towards the rear end.
  10. 10. The clamping device as recited in claim 7, characterised in that the guide sleeve first axial end is spaced from the tapered outer surface in a direction along the elongate cylindrical portion away from the front end and towards the rear end.

Description

Clamping device for clamping tools or workpieces Cross Reference to Related Applications The present application claims the benefit of U.S. provisional patent application serial No. 62/985,523 filed 3/5 in 2020, which is incorporated herein by reference in its entirety. Technical Field The present invention relates to a clamping device for clamping a tool or workpiece, and more particularly to a clamping device having a body with a centering sleeve disposed therein and a guide sleeve disposed in the body and in a portion of the centering sleeve. Background A collet is a device having two or more "jaws" between which an object, such as a tool or workpiece, may be placed, the jaws forming a collar around the object. The jaws of the collet are configured to tighten around an object and apply a clamping force. In one type of collet, the tightening of the jaws can be affected by pushing a suitable mechanism around the circumference of the collet. In another type of chuck, known as a pull-in chuck, the chuck is tapered and pulled into a sleeve to tighten the jaws around a tool or workpiece. The jaws are typically made of steel, which allows the jaws to be flexible enough relative to each other to facilitate tightening of the tool or workpiece. With either type, the collet is held in a clamping device that is connected to a rotatable shaft, which in turn rotates the tool or workpiece. The tool is engaged with or by the workpiece while the tool is held in the collet and rotated. The workpiece is engaged with or by the tool with the workpiece clamped in the chuck and rotated. The rotational accuracy of the tool or workpiece affects the process of removing chips from the workpiece. In particular, the rotational accuracy of a tool or workpiece typically depends on concentricity along the axis of rotation. Once clamped into a machine tool such as a lathe or grinder, the tool or workpiece is adjusted to achieve concentricity when rotated. During rotation, concentricity achieved by the mechanical clamping is often insufficient or compromised, creating runout that will adversely affect the finished workpiece. Concentricity is often adjusted multiple times during operation of the machine tool. For example, some guide sleeves of the guide chucks introduce additional runout because they cannot be precision ground into place in the body. In addition, some guide sleeves are made of materials that tend to flexibly deform during use. Further, some guide sleeves are held in place solely by friction and tend to undesirably move toward the front end of the body when the collet is removed from the guide sleeve. In addition, some prior art clamping systems require separate centering and/or guiding sleeves for each size of chuck, which increases installation time. Disclosure of Invention The invention discloses a clamping device for clamping a tool or a workpiece. 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. The forward end axial abutment surface axially faces the aft end and the intermediate axial abutment surface axially faces the aft end. The intermediate axial abutment surface is axially located between the fastening region and the front end axial abutment surface. The intermediate axial abutment surface is radially outward relative to the forward end axial abutment surface. The centering sleeve is disposed in the stepped bore. The centering sleeve extends axially between a centering sleeve first axial end and a centering sleeve second axial end. The guide sleeve is disposed in the stepped bore and partially disposed in the centering sleeve. The guide sleeve extends axially between a guide sleeve first axial end and a guide sleeve second axial end. The locking member is removably disposed in the fastening region. The locking member has a tapered abutment surface formed thereon and facing the front end of the body. The centering sleeve is axially retained by and between the tapered abutment surface and the mid-axial abutment surface. The guide sleeve is axially retained by the tapered abutment surface and the intermediate axial abutment surface. In some embodiments, the centering sleeve tapered abutment surface extends from the centering sleeve second axial end toward and terminates at the centering sleeve outer surface end. The centering sleeve tapered abutment surface engages the tapered abutment surface of the locking member. In some embodiments, the guide sleeve tapered abutment surface extends from the guide sleeve second axial end toward and terminates at the guide sleeve outer surface. The guide sleeve tapered abutment surface engages the tapered abutment surface of the locking member. In some embodiments, the guide sleeve includes a lip extending axially from the guide sleeve first axial end toward the guide sleeve second axial end and terminating in a guide sleeve axial biasing unit receiving surfac