Vibration body for cutting, processing device, molding die and optical element

Abstract

In the assembly of vibration body, the first width in the lateral direction (X axis direction) is greater than the second width in the longitudinal direction (Y axis direction) in the cross sectional form perpendicular to Z axis of the first portion on the tip side from the closest node position, thereby, the rigidity of a vibration body main part in the X axis direction can be enhanced, and lateral bending vibrations on fixing portion can be restrained. Consequently, an object can be processed highly accurately by the assembly of vibration body that is controlled with a high precision.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top view of a vibration cutting unit of the first embodiment.

FIG. 2( a), FIG. 2(b) and FIG. 2(c) represent respectively a top view, a side view and an end view, all for an assembly of a vibration body.

Each of FIG. 3(a) and FIG. 3(b) is an enlarged sectional view illustrating a form of the vibration body main part.

FIG. 4( a) is a side view and an end view illustrating how an axial direction oscillator is mounted.

FIG. 5( a) and FIG. 5(b) represent respectively an end view and a top view, both for a tip of a tool portion.

FIG. 6 is a side view of a cutting tool.

FIG. 7( a), FIG. 7(b) and FIG. 7(c) represent respectively a top view, a side view and an end view, all for an assembly of a vibration body that is the first variation.

FIG. 8( a), FIG. 8(b) and FIG. 8(c) represent respectively a top view, a side view and an end view, all for an assembly of a vibration body that is the second variation.

FIG. 9( a), FIG. 9(b) and FIG. 9(c) represent respectively a top view, a side view and an end view, all for an assembly of a vibration body that is the third variation.

FIG. 10( a), FIG. 10(b) and FIG. 10(c) represent respectively a top view, a side view and an end view, all for an assembly of a vibration body that is the fourth variation.

FIG. 11( a), FIG. 11(b) and FIG. 11(c) represent respectively a top view, a side view and an end view, all for an assembly of a vibration body that is the fifth variation.

FIG. 12 is a block diagram illustrating a processing device of the second embodiment.

Each of FIG. 13(a) and FIG. 13(b) is an enlarged top view illustrating how the work is processed by the use of the processing device shown in FIG. 9.

Each of FIG. 14(a) and FIG. 14(b) is a side sectional view of a molding die relating to the third embodiment.

FIG. 15 is a side sectional view of a lens formed by the molding die shown in FIG. 14.

FIG. 16 is a diagram illustrating the structure of the processing device used in the first example.

FIG. 17 is a graph illustrating the results of vibration cutting processing conducted by the method of the example.

FIG. 18 is a graph illustrating the results of vibration cutting processing conducted by the method of the comparative example.

FIG. 19 is a partly-enlarged top view illustrating how to mount a bending oscillator for longitudinal bending vibration.

Claims

1. A vibration body for cutting comprising: a fixing portion for fixing a cutting tool for vibration cutting; anda vibration body main part for transmitting a bending vibration and an axial vibration to the cutting tool fixed to the fixing portion,wherein, with respect to a profile of a cross sectional plane perpendicular to an axial direction of the vibration body main part in a supporting base region which is a portion between a cross sectional plane perpendicular to the axial direction of the vibration body main part at a closest node position where a node closest to the fixing portion is located, the closest node being among nodes relating to the bending vibration formed in the vibration body main part and a cross sectional plane perpendicular to the axial direction of the vibration body main part at a cutting tool rear end position where an end of the fixed cutting tool, which is closest to the closest node position is located, a length of the profile in a direction perpendicular to a prescribed bending vibration direction of the vibration body main part is longer than a length of the profile in the prescribed bending vibration direction.

2. The vibration body for cutting of claim 1, wherein the length in the direction perpendicular to the prescribed bending vibration direction is longer than the length in the prescribed bending vibration direction by a factor of 1.1 to 10 times.

3. The vibration body for cutting of claim 1, wherein, in the supporting base region, at least one of the length in the direction perpendicular to the prescribed bending vibration direction and the length in the prescribed bending vibration direction decreases from the closest node position toward the fixing portion.

4. The vibration body for cutting of claim 1, wherein, in the supporting base region, a profile of any cross sectional plane perpendicular to the axial direction is oval.

5. The vibration body for cutting of claim 1, wherein, in the supporting base region, a profile of any cross sectional plane perpendicular to the axial direction has at least one straight-line portion.

6. A vibration body for cutting comprising: a fixing portion for fixing a cutting tool for vibration cutting; anda vibration body main part for transmitting a bending vibration and an axial vibration to the cutting tool fixed to the fixing portion,wherein a resonance frequency of a longitudinal bending vibration in a prescribed bending vibration direction of the vibration body main part differs from a resonance frequency of a lateral bending vibration perpendicular to the prescribed bending vibration direction.

7. A vibration body for cutting comprising: a fixing portion for fixing a cutting tool for vibration cutting; anda vibration body main part for transmitting a bending vibration and an axial vibration to the cutting tool fixed to the fixing portion,wherein an antinode of a longitudinal bending vibration in a prescribed bending vibration direction of the vibration body main part is formed in the fixing portion or a vicinity of the fixing portion and an antinode of a lateral bending vibration perpendicular to the prescribed bending vibration direction is formed in a portion except in the fixing portion and the vicinity of the fixing portion.

8. The vibration body for cutting of claim 1 further comprising: a holding member integrally formed on a node portion corresponding to at least one of node positions of vibration relating to a bending vibration and an axial vibration when the vibration body main part vibrates.

9. The vibration body for cutting of claim 8, wherein, the holding member extends from the node portion in a direction perpendicular to the prescribed bending vibration direction of the vibration body main part.

10. The vibration body for cutting of claim 1 further comprising: a vibration source for vibrating the cutting tool through the vibration body main part by providing a vibration to the vibration body main part.

11. The vibration body for cutting of claim 10, wherein the vibration source includes an axial vibration source for providing an axial vibration to the vibration body main part and the axial vibration source is set so that an angle difference between a vibration direction of the axial vibration source and the axial direction of the vibration body main part is within 5 minutes.

12. The vibration body for cutting of claim 10, wherein the vibration source includes a bending vibration source for providing a bending vibration to the vibration body main part and the bending vibration source is set so that an angle difference between a vibration direction of the bending vibration source and the prescribed bending direction of the vibration body main part is within 5 minutes.

13. A processing device comprising: the vibration body for cutting of claim 1; anda driving device for moving the vibration body for cutting while operating the vibration body for cutting.

14. A molding die which is produced by using the vibration body for cutting of claim 1 and which has a transfer optical surface for forming an optical surface of an optical element.

15. An optical element produced by using the vibration body for cutting of claim 1.