Cutting by use of rotating axially moving tool – Tool having crystalline cutting edge
Patent
1992-06-29
1994-06-21
Rosenbaum, Mark
Cutting by use of rotating axially moving tool
Tool having crystalline cutting edge
408227, 408714, B23B 5110, B24D 1700
Patent
active
053223985
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tool for machining bores.
More particularly, it relates to a tool for machining bore transitions, which has a stem adapted to be clamped in a drive member in order to execute an advance of the tool through the bore in the working position, a return stroke and an at least a rotational working movement of the tool, with a cutting part at its end adjustable against the force of a spring.
Tools of the above mentioned general type are known in the art.
A tool of this kind, which is known from German Offenlegungsschrift 3333499 is a deburring tool or a tool for forming a chamfer at the transition from a transverse bore to a longitudinal bore. The tool has a finger-shaped cutting tool which is intended for chip-removing machining and which is pivoted outwards in the radial direction about a pivot axis, against the force of a spring, by a pivoting device and through an adjustment movement made by said device. In its rotation it turns a chamfer at the transition edge between the transverse bore and the longitudinal bore. Tools of this kind are provided and suitable for forming relatively large chamfers when the exact geometrical shape of the edge of a bore leading into another bore is not important. Since the transition between a transverse bore and a longitudinal bore lies in a curved and not a flat plane, while the turning movement of the tool occurs only in a flat plane, the thickness of the chamfer varies in size. Therefore transitions machined in this way cannot be made when there are special requirements in respect of control edge shapes.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a tool for machining bores, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a tool of the above mentioned type, in which the cutting part is disposed on at least two resilient arms forming at least a part of the stem.
When the tool is designed in accordance with the present invention, with the aid of such tool the transition edges of a transverse bore which leads into a longitudinal bore can be machined in such a manner that uniform removal of material is achieved substantially over the entire periphery of the edge, so that a burr formed there by machining processes is removed without undesirable rounding occurring. Such burrs occur even when, after accurate production of the longitudinal and transverse bores followed by the hardening of the parts, the longitudinal bore, for example, is subjected to high precision honing to guide an injection pump piston. Burrs of considerable size then project into the transverse bore and, if they break off, may give rise to the malfunctioning of an injection pump. In this connection it should be noted that the pump pistons are guided in the longitudinal bore with a high precision fit and move sealingly against pressures of for example 1000 bars. Particles of material such as broken-off burrs have here a very considerable effect on the operating reliability of the pump piston guide. It is therefore a requirement that such burrs should be removed. With the aid of the tool according to the invention this can be done in the desired manner.
In accordance with another new feature of the present invention the resilient arms are formed by a spring wire bent into hairpin shape, and the cutting part is composed of ends of the spring wire which are bent in the shape of a head, which are movable in such a manner as to overlap each other resiliently and are coated with a cutting medium. When the tool is designed in accordance with these features, it has a particularly advantageous construction with a wire, through the use of which a large range of bore diameters can be machined. This embodiment is particularly easily adapted to a transverse bore transition edge lying in a curved plane, with easy insertability through the transverse bore. In an advan
REFERENCES:
patent: 450323 (1891-04-01), Tomlinson
patent: 1126961 (1915-02-01), Denney
patent: 1786520 (1930-12-01), Darling
patent: 2732612 (1956-01-01), Hallock
patent: 3076254 (1963-02-01), Ricci
patent: 5158405 (1992-10-01), Serafin
Aulich Dieter
Essig Peter
Schmidt Hermann
Husar John M.
Robert & Bosch GmbH
Rosenbaum Mark
Striker Michael J.
LandOfFree
Tools for machining bores does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tools for machining bores, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tools for machining bores will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2217602