Drilling head with vibratory effect

Details Drilling head with vibratory effect Drilling head with vibratory effect

2000-01-04

2001-05-22

Wellington, A. L. (Department: 3722)

Cutting by use of rotating axially moving tool

Including means to cause tool to progressively vibrate...

C408S056000, C408S059000

Reexamination Certificate

active

06234728

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to the field of operations of machining workpieces, such as making drillings, particularly very deep drillings.
DESCRIPTION OF THE RELATED ART
Drilling machines are known which comprise a mechanism designed, as the drilling head advances, to bring about forced reciprocating movements over a predetermined stroke, these forced movements causing the thickness of the chip to vary, allowing it to break up and thus making it easier to remove. In spite of these advantages, such mechanisms are complicated, bulky and expensive.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to provide a penetrating-tool mounting attachment of a particularly simple structure which makes it possible to bring about reciprocating movements of the tool as it advances.
The attachment for mounting on a machine a penetrating tool such as a drilling head, having a machining axis, comprises, according to the invention, a support equipped with means of coupling it to a machine, a tool holder provided with means for attaching a tool, means for axially guiding the tool holder with respect to the support, means for rotationally connecting the tool holder and the support, and elastically deformable means for connecting the tool holder and the support in terms of axial translation, the said elastically deformable means of connection in axial translation being dimensioned such as to produce self-sustained reciprocating or vibrating axial movements of the tool holder during the controlled relative advance of the support with respect to the workpiece.
According to the invention, the mounting attachment may advantageously comprise means for adjusting the stiffness of the said elastically deformable means of connection in axial translation.
According to an alternative form of the invention, the said guide means comprise two axially deformable annular plates comprising an inner part and an outer part which are connected respectively to the support and to the tool holder and which are joined together by non-radial branches.
According to one alternative form of the invention, the said guide means comprise a ball-type slideway.
According to another alternative form of the invention, the said elastically deformable connecting means comprise at least one spring leaf arranged in a radial plane, which is fixed at two points spaced along its length to, on the one hand, the support and, on the other hand, the tool holder.
According to a preferred alternative form of the invention, the said elastically deformable means of connection in axial translation comprise two spring leaves arranged parallel to each other in a radial plane and one on each side of the axis, the said leaves being fixed to, on the one hand, the support and, on the other hand, the tool holder, at a mid-point and at two points spaced from this mid-point on each side thereof in the direction of their length, respectively.
According to the invention, means are preferably provided for adjusting the distance between the said points of attachment of the said spring leaf or leaves.
According to another alternative form of the invention, the said elastically deformable means of connection in axial translation comprise at least one essentially cylindrical spring.
According to the invention, the said cylindrical spring may advantageously comprise a cylinder which, in its wall, has offset openings so as to form peripheral portions which are elastically deformable in the axial direction.
According to the invention, the ends of the said cylindrical spring are preferably fixed to the support and to the tool holder, respectively.
According to the invention, the support preferably comprises a cylindrical part for coupling to the machine, extended by a cylindrical part into which the tool holder at least partially extends.
According to the invention, in an alternative form, the mounting attachment comprises means for conveying fluid to the tool, comprising a duct running axially through the support, a duct running axially through the tool holder and a pipe connecting the said ducts and which is axially deformable or flexible.


REFERENCES:
patent: 2453136 (1948-11-01), Karweit
patent: 3303522 (1967-02-01), Kumabe et al.
patent: 5702211 (1997-12-01), Roemer et al.
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patent: 99/02291 (1999-01-01), None
Patent Abstract of Japan vol. 001, No. 082 (M-028), Jul. 29, 1977 & JP 52 024394 A (Shinei Seisakusho:KK), Feb. 23, 1977.
Verified Translation with verification and copy of WO 99/02291.
Forms PCT/IB/301; PCT/IB/304; PCT/IB/308; PCT/IB/332; PCT/IPEA/409.

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