Machining toolholder

Patent metadata

Field	Value
Publication number	US-10279396-B2
Application number	US-201715810978-A
Country	US
Kind code	B2
Filing date	Nov 13, 2017
Priority date	Mar 29, 2017
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A machining toolholder including a body, a horn and a piezoelectric actuator is disclosed. The body includes a center through hole extending in the axial direction therein. The center through hole includes a first hole section and a second hole section. The horn includes a first section and a second section which are disposed coaxially and connected with each other. Part of the first section is slidably inserted into the first hole section. The second section is connected to the body and engaged with a tool. Part of the surface of the second section contacts with a wall surface of the second hole section. The piezoelectric actuator fits around the horn and is controllable to drive the tool to vibrate. With this design, the machining toolholder could have good stiffness and connection stability, and could resist to the stress effectively.

First claim

What is claimed is:

1. A machining toolholder, adapted to be engaged with a tool, wherein the machining toolholder is provided on a spindle and is driven by the spindle to rotate, the machining toolholder comprising:
a body, comprising a center through hole extended along an axial direction therein;
a horn, comprising a first section and a second section, wherein the first section and the second section are disposed coaxially and connected with each other; the first section is partially inserted into the center through hole; the second section is connected to the body and engaged with the tool and the first section is slidably engaged with the body; and
a piezoelectric actuator, adapted to be fit around the horn and controllable to drive the tool to vibrate;
wherein an outer peripheral surface of the first section is directly and slidably coupled to an inner surface of the center through hole, and an outer peripheral surface of the second section is fixed to the inner surface of the center through hole;
wherein the second section comprises a first vibration amplitude-amplifying part and a flange; the first vibration amplitude-amplifying part is engaged with the tool; the flange is extended outwardly from the outer surface of the first vibration amplitude-amplifying part in a radial direction; the center through hole comprises a first hole section and a second hole section; part of the first section is inserted into the first hole section and is directly and slidably coupled to the first hole section, and the flange of the second section abuts against a wall surface of the second hole section; a first resonance node of the horn is formed at a joint between the first section and the body when the piezoelectric actuator vibrates, wherein the first resonance node has a minimum displacement; a second resonance node of the horn is formed at a joint between the second section and the body when the piezoelectric actuator vibrates, wherein the second resonance node has a minimum displacement.

2. The machining toolholder of claim 1 , wherein the flange of the second section comprises a deformation part for generating a flexural deformation when the horn vibrates.

3. The machining toolholder of claim 2 , wherein the deformation part is located between one end of the flange abutting against the wall surface of the second hole section and the other end of the flange connected with the first vibration amplitude-amplifying part.

4. The machining toolholder of claim 3 , wherein the deformation part comprises a ring-shaped groove recessed from a top surface or a bottom surface of the flange.

5. The machining toolholder of claim 1 , wherein an outer surface of the first vibration amplitude-amplifying part is tapering toward the end to be engaged with the tool.

6. The machining toolholder of claim 1 , wherein the second section comprises a second vibration amplitude-amplifying part; one end of the second vibration amplitude-amplifying part is connected to the first vibration amplitude-amplifying part, and the first vibration amplitude-amplifying part is engaged with the tool via the second vibration amplitude-amplifying part.

7. The machining toolholder of claim 6 , wherein the outer surfaces of the first vibration amplitude-amplifying part and the second vibration amplitude-amplifying part are tapering toward the end to be engaged with the tool.

8. The machining toolholder of claim 7 , wherein a minimum displacement of the horn is at a joint between the second vibration amplitude-amplifying part of the horn and the tool, while a maximum displacement of the horn is at a processing end of the tool.

9. The machining toolholder of claim 8 , wherein a bottom width of the first vibration amplitude-amplifying part is smaller than a top width of the second vibration amplitude-amplifying part.

10. The machining toolholder of claim 1 , wherein the tool comprises a channel axially disposed therein; the horn comprises a channel extending from the first section to the second section in the axial direction, and the channel of the horn communicates with the center through hole of the body and the channel of the tool.

11. The machining toolholder of claim 1 , further comprising at least one sealing member disposed on the horn, the sealing member abuts against a wall surface of the first hole section and a surface of the first section.

Assignees

• Univ Nat Chung Hsing

Inventors

• Chen Jenq-Shyong
• Wang Hao-Tang

Classifications

• B23Q1/0009

  Energy-transferring means or control lines for movable machine parts; Control panels or boxes; Control parts (control handles for driving or feeding mechanisms B23Q5/54) · CPC title

• H02N2/0035

  Cylindrical vibrators · CPC title

• B24D5/10

  with cooling provisions, e.g. with radial slots · CPC title

• B24D5/16

  Bushings; Mountings · CPC title

• B23B2231/24

  Cooling or lubrication means · CPC title