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CN-122007462-A - High stability CNC handle of a knife structure to low frequency vibrations

CN122007462ACN 122007462 ACN122007462 ACN 122007462ACN-122007462-A

Abstract

The invention relates to the technical field of tool shanks, in particular to a high-stability CNC tool shank structure aiming at low-frequency vibration, which comprises a tool shank mechanism, wherein the tool shank mechanism comprises an upper tool shank fixedly connected with a main machine spindle and a lower tool shank in threaded connection with the upper tool shank, a driving cavity is formed in the upper tool shank, a driving assembly is arranged in the driving cavity, a collet chuck cavity is formed in the lower tool shank in a penetrating manner along the axis of the lower tool shank, a collet chuck assembly is arranged in the collet chuck cavity, the collet chuck assembly comprises a collet chuck arranged in the collet chuck cavity and in threaded connection with the driving assembly, and a tool damping clamping piece arranged on the collet chuck.

Inventors

  • LI MIN
  • Ru Lingwei

Assignees

  • 利固盛精工机械(昆山)有限公司

Dates

Publication Date
20260512
Application Date
20260209

Claims (10)

  1. 1. A CNC knife handle structure with high stability aiming at low-frequency vibration is characterized by comprising, The tool handle mechanism (1) comprises an upper tool handle (2) fixedly connected with a main shaft of the host machine and a lower tool handle (3) in threaded connection with the upper tool handle (2); a driving cavity (4) is formed in the upper cutter handle (2), and a driving assembly (5) is arranged in the driving cavity (4); The lower knife handle (3) is provided with a collet cavity (6) in a penetrating way along the axis of the lower knife handle, and a collet assembly (7) is arranged in the collet cavity (6); the collet assembly (7) comprises a collet (8) disposed within the collet cavity (6) that is threadably connected to the drive assembly (5), and a cutter dampening grip (9) disposed on the collet (8).
  2. 2. The CNC knife handle structure for the low-frequency vibration is characterized in that the driving cavity (4) consists of a worm cavity (401) and a turbine cavity (402), and the worm cavity (401) is communicated with the turbine cavity (402); The drive assembly (5) comprises a worm (501) arranged in the worm cavity (401) and a turbine (502) arranged in the turbine cavity (402).
  3. 3. The CNC shank structure for low frequency vibration according to claim 2, wherein the collet (8) comprises a threaded rod (801) in threaded connection with the turbine (502), a cylinder (802) arranged at the bottom end of the threaded rod (801), and clamping plates (803) arranged at the bottom end of the cylinder (802) and in an annular array.
  4. 4. The CNC shank structure of claim 3, wherein the clamping plates (803) are arc-shaped plates, spaces exist among a plurality of groups of clamping plates (803) in an annular array, and the diameter of a circle formed by the groups of clamping plates (803) in the annular array, which is close to one end of the cylinder (802), is smaller than the diameter of a circle formed by the clamping plates (803), which is far away from the end of the cylinder (802).
  5. 5. The CNC shank structure with high stability for low frequency vibration according to claim 4, wherein a cutter slot (804) is formed in the bottom end of the cylinder (802), and the diameter of the cutter slot (804) is matched with the diameter of a circle formed by a plurality of groups of clamping plates (803) of the annular array, which are close to one end of the cylinder (802).
  6. 6. The CNC knife handle structure with high stability for low-frequency vibration according to claim 5, wherein the inner wall of the knife slot (804) is provided with a containing groove (805), and an annular array in the containing groove (805) is provided with through holes (806); the cutter damping clamping piece (9) comprises a clamping block (901) which is arranged in the accommodating groove (805) in an annular array manner, a movable rod (902) which is arranged on the side wall of the clamping block (901) and is movably inserted into the through hole (806), and a rubber ring (903) which is sleeved outside the cylinder (802).
  7. 7. The CNC knife handle structure with high stability for low-frequency vibration according to claim 6, wherein a wedge-shaped surface (904) is arranged at the bottom end of the clamping block (901).
  8. 8. The CNC knife handle structure for the low-frequency vibration is characterized in that an inner groove (807) is formed in the outer wall of the cylinder (802), the inner groove (807) is in an annular shape, and the inner groove (807) and the through hole (806) are positioned on the same horizontal line and are in a communicating arrangement; An expansion block (905) is arranged at one end of the movable rod (902) far away from the clamping block (901), and the expansion block (905) is movably arranged in the inner groove (807); the rubber ring (903) is sleeved at the inner groove (807) to shrink.
  9. 9. The CNC knife handle structure for the low-frequency vibration is characterized in that an extrusion spring (10) is arranged at the top end of the cylinder (802), the extrusion spring (10) is sleeved with a threaded rod (801), an extrusion sleeve cover (11) is arranged at the top end of the extrusion spring (10), and the extrusion sleeve cover (11) is sleeved with the top end of the cylinder (802).
  10. 10. The CNC knife handle structure for the low-frequency vibration is characterized in that a boss (808) is arranged at the position, which is flush with the outer wall of the cylinder (802) and is parallel to the lower wall of the inner groove (807); the extrusion sleeve cover (11) is provided with a via hole (1101), and the inner wall of the bottom end of the extrusion sleeve cover (11) is provided with the via hole (1101).

Description

High stability CNC handle of a knife structure to low frequency vibrations Technical Field The invention relates to the technical field of tool shanks, in particular to a high-stability CNC tool shank structure aiming at low-frequency vibration. Background During CNC processing, stable centre gripping of cutter is crucial to guaranteeing machining precision and work piece quality, and the collet chuck is as the key part of connecting cutter and lathe main shaft in the handle of a knife structure, and its design directly influences stability and the vibration condition of cutter in the course of working. Conventional collet structures typically rely on interference friction with the inner wall of the collet cavity to effect clamping of the tool, and in particular operations, the drive assembly is threaded with the collet, which is moved up by the threaded connection until the collet interferes with and contracts against the inner wall of the collet cavity, thereby clamping the internal tool. However, in this process, before the driving component is screwed with the collet chuck and drives it to move upwards, it must be ensured that the collet chuck has made a sufficient interference friction with the inner wall of the collet chuck cavity, otherwise, the operation of the driving component will cause the collet chuck to rotate synchronously instead of moving upwards, and thus effective tool clamping cannot be achieved, so that it is usually necessary to manually rotate the collet chuck to make it make interference with the inner wall of the collet chuck cavity while screwing with the driving component, however, in the manual screwing process, if the cutter is inserted before the collet is abutted against the inner wall of the cavity of the collet, the cutter is not fixed and is easy to fall down when the collet is in threaded connection with the driving assembly, so that the collet is easy to retract, the lower end of the fixed cutter is lower than the set height, and if the cutter is inserted after the abutment is formed, the insertion difficulty is increased or even the cutter cannot be inserted because the collet is partially retracted. And secondly, due to the fit clearance between the cutter deep end and the inner cavity of the collet chuck, low-frequency vibration is easy to occur at the cutter deep end in the machining process, and the vibration is small in amplitude, but is enough to influence the flatness of the machined surface of the workpiece, so that the machining quality is reduced, and particularly the high-precision machining is realized, and the low-frequency vibration becomes an important factor for restricting the improvement of the machining precision. In order to solve the above problems, a high stability CNC tool handle structure for low frequency vibration is provided. Disclosure of Invention (One) solving the technical problems Aiming at the problems in the prior art, the invention provides a high-stability CNC knife handle structure aiming at low-frequency vibration, so as to solve the problems that the knife handle of the traditional CNC knife handle structure mentioned in the background art is high in installation and operation difficulty, and the cutter after installation is unstable in clamping caused by the low-frequency vibration in the processing process, so that the flatness of a processing surface is not high. (II) technical scheme In order to achieve the aim, the invention provides the technical scheme that the CNC knife handle structure for the low-frequency vibration comprises a knife handle mechanism, a knife handle mechanism and a knife handle mechanism, wherein the knife handle mechanism comprises an upper knife handle fixedly connected with a main shaft of a host machine and a lower knife handle in threaded connection with the upper knife handle; a driving cavity is formed in the upper cutter handle, and a driving assembly is arranged in the driving cavity; the lower knife handle is provided with a collet cavity in a penetrating way along the axis of the lower knife handle, and a collet assembly is arranged in the collet cavity; The collet assembly includes a collet disposed within the collet cavity that is threadably coupled to the drive assembly, and a cutter dampening clip disposed on the collet. The invention is further arranged that the driving cavity consists of a worm cavity and a turbine cavity, and the worm cavity is communicated with the turbine cavity; the driving assembly comprises a worm arranged in the worm cavity and a turbine arranged in the turbine cavity. The invention further provides that the collet comprises a threaded rod which is in threaded connection with the turbine, a cylinder which is arranged at the bottom end of the threaded rod, and clamping plates which are arranged at the bottom end of the cylinder and are in an annular array. The invention is further arranged that the clamping plates are arc-shaped plates, spaces exist among a plurality