Abrading – Machine – Reciprocating tool
Patent
1994-08-05
1996-07-30
Kisliuk, Bruce M.
Abrading
Machine
Reciprocating tool
451177, B24B 700, B24B 900
Patent
active
055406149
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
The invention relates to apparatus in accordance with the preamble of claim 1.
STATE OF THE ART
Apparatus of this type has previously been described in the magazine "Werkstattechnik-Zeitschrift f ur industrielle Fertigung" (English translation: Machine Shop Technology Magazine for Industrial Production) 60 (1970) No. 10, page 621 in the article contained therein "Schleifen von Magnetlegierungen reit Hilfe von Ultraschallschwingungen" (English translation: Grinding of Magnetic Alloys with the aid of Ultrasonic Oscillations) which will be discussed in more detail below.
It is known that the grinding of workpieces serves to achieve desired shape and dimensional precision as well as a specific surface quality or finish of the resulting workpieces, involving external circular (cylindrical) grinding, internal circular grinding, circumferential grinding, surface grinding and the like depending upon the geometric configuration and intended application of the respective workpiece.
To obtain the desired surface quality, one works with relatively high cutting speeds. However, even when using a diamond grinding wheel, there still occurs rapid wear of the grinding wheel, which significantly increases the required processing time of the workpieces. In particular, the increasing technological application of ceramic materials imposes enhanced demands upon apparatus for grinding such workpieces, because their desired shape- and dimensional precision, as well as their surface quality, are usually exceptionally high.
Such special demands arise for example in the surface treatment of ceramic sleeve bearings, especially for self-lubricated compressor pistons. There it is necessary to achieve, through an appropriate grinding process, a surface quality which ensures the formation of sliding surfaces having exceptionally low surface friction during practical application of the sleeve bearings.
From German patent (DE-PS) 915,769 there is known a machine tool in which the workpiece is set, by means of a piezoelectric or magnetostrictive ultrasonic transducer, into a high frequency oscillation during its processing, which can also be transverse to the processing direction. Through this additional oscillating motion of the workpiece, the useful life of the tools is enhanced, the processing time of the workpieces is reduced, and the surface quality of the so-treated workpieces is enhanced.
From Japanese patent abstract (JP) 63-312051A it is known, in the grinding of ceramic materials, to set the workpiece into high frequency oscillation in the direction of advance.
In Japanese patent abstract (JP) 61-61759A there is shown apparatus for the grinding of magnetic heads for video recorders, in which the workpiece is set into oscillation transversely to the processing direction by a piezoelectric ultrasonic transducer. In so doing, the movement of the piezoelectric oscillator is transmitted to the workpiece by an actuating rod. The disadvantage of this known apparatus is that the amplitude of the oscillating motion of the workpiece corresponds essentially to the amplitude of the oscillating motion of the piezoelectric oscillator and is correspondingly small.
From the above cited article "Schleifen von Magnetlegierungen mit Hilfe von Ultraschallschwingungen" (English translation: Grinding of Magnetic Alloys with the aid of Ultrasonic Oscillations) in "Werkstattechnik-Zeitschrift f ur industrielle Fertigung" (English translation: Machine Shop Technology Magazine for Industrial Production) an apparatus according to the preamble of claim 1 is known. In particular, magnetic alloys are ground there with the aid of ultrasonic oscillations. In so doing, the oscillation direction of the workpiece is transverse to the processing direction. The workpiece is clamped between a stationary member and an arbor, the arbor being connected to a magnetostrictive ultrasonic transducer and transmitting the oscillations to the workpiece. In this apparatus, also, it is disadvantageous that the amplitude of the oscillating motion
REFERENCES:
patent: 3699719 (1972-10-01), Rozdilsky et al.
patent: 4369603 (1983-01-01), Gebel et al.
patent: 4751916 (1988-06-01), Bory
patent: 4934103 (1990-06-01), Campergue et al.
patent: 4991356 (1991-02-01), Ono
Magazine Article: Schleifen von Magnetlegierungen mit Hilfe von Ultraschallschwingungen by S. G. Redierko, published in Werkstattechnik-Zeitschrift f ur industrielle Fertigung, No. 10, p. 621, 1970.
Banks Derris H.
Kisliuk Bruce M.
PPV - Verwaltungs-AG
Stapler, Esq Alfred
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