Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1995-10-13
1998-01-06
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
408180, B23B 5100
Patent
active
057047430
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a deburring tool comprising a holder from which an elongated sleeve extends, a machining element which is arranged close to a free end of the sleeve, is movable in the latter and has a machining side, an opening which is made in the wall of the sleeve close to the free end thereof and is delimited by a limiting edge, and having control means which are able to engage on the machining element in the sleeve in such a way that said machining element in a first position is located inside the periphery of the sleeve and in a second position protrudes, with its machining side, via said opening, at least partially outside the sleeve.
A deburring tool of this type is disclosed in U.S. Pat. No. 2,438,558. Burrs which arise on the machining edges during a mechanical machining operation, such as, for example, the drilling of holes, can be removed using a tool of this type.
In order to remove, for example, buns at the edges of drilled holes which terminate in a cavity within a workpiece or product, the elongated sleeve must be inserted so far into the drilled hole that the free end of said sleeve, where the machining element can protrude outwards, extends beyond the drilled hole into the said cavity. The machining element is then moved outside the periphery of the sleeve with the aid of the control means and locked in this position.
By withdrawing the elongated sleeve, the machining element is then made to engage on the edge which is to be deburred and is inside the workpiece. The buns can then be effectively removed by then exerting a pulling and turning movement on the sleeve.
After the buns have been removed, the machining element is released again with the aid of the control means, so that said element can return inside the periphery of the sleeve and the sleeve can be withdrawn from the drilled hole concerned.
The sleeve has a two-fold function, i.e. the introduction and withdrawal of the machining element into and out of a drilled hole without damaging the wall thereof and stable support of said element, so that, for example, in the case of a cylindrical drilled hole and sleeve the edge of the drilled hole to be deburred retains its circular shape.
However, the known deburring tool has the disadvantage that material shaved off during machining can easily penetrate into the sleeve via the opening through which the machining element protrudes outwards and can accumulate in said sleeve. The consequence of this is that the machining element is not able to return completely to its first position in the sleeve and/or can do so only with difficulty, with the risk of undesired damage to the wall of the drilled hole-during removal of the tool.
Other known embodiments of deburring tools, such as, for example, are disclosed in German Patent 67,387, U.S. Pat. Nos. 2,404,027 and 3,540,325 and German Patent Application 3,432,035, all likewise have the risk of obstruction of the maching element by machined material accumulating in the sleeve around the machining element during use.
The fact that these tools are nowadays not used or hardly used in practice and that such burrs are usually removed using a file or steel scraper is probably a consequence of this disadvantage. The use of a file involves the risk that, for example, the wall of a drilled hole or other pans of a workpiece can be damaged, whereas working with a steel scraper can be a very time-consuming task, especially when deburring the intersection of two drilled holes in a workpiece or product. Moreover, a file can not be used, for example, for deburring drilled holes which open centrally inside an elongated tube or pipe.
The object on which the invention is based is to provide an improved deburring tool with which it is possible efficiently to remove burrs formed during machining operations, in particular at the edges of drilled holes terminating in a cavity inside a workpiece, without damaging the wall of the drilled hole and irrespective of the dimensions or shape of the product.
The deburring tool according to the invention is characteris
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Goorsenberg Beheer B.V.
Howell Daniel W.
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