Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1990-10-19
1993-09-21
Rose, Robert A.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
5116576, 51289R, 51 66, B24B 4916
Patent
active
052457931
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for fine-working or microfinishing of a workpiece surface, particularly applicable to moving workpiece surfaces, wherein material is cut off or abraded by means of a tool moved relatively thereto and having a plurality of geometrically undefined cutting edges, which tool is infed against the workpiece surface with a specific contact pressure.
BACKGROUND OF THE INVENTION
In the short-stroke honing or superfinishing described in DE-OS 35 33 082, the honing stone is applied to the surface which is to be worked of a rotationally symmetrical workpiece with a specific contact pressure. This is said to result in a certain abrasion of the workpiece with simultaneous smoothing. Further it is said that where the contact pressure applied is only slight the workpiece material removal is also relatively slight and essentially only a smoothing of the workpiece surface takes place. Thereafter, the so-called "release effect" ("Ausklinkeffekt") is said to occur, because the smooth surface of the workpiece is no longer capable of tearing out of the stone structure those cutting grains which have become blunted. However, were the pressure to be considerably increased, the honing stone and the workpiece would be forced into continuous contact because a continuous self-priming of the honing stone would occur, however without the desired smoothing being achieved.
Apart from the last-mentioned disadvantage, a high contact pressure can also be disadvantageous for other reasons. Therefore, the present invention relates also to the microfinishing of workpiece surfaces as carried out with so-called superfinish machines or superfinish equipment. This finishing method lies in the category of "short-stroke honing", and is a process to improve the surface quality or the size precision as well as to produce a defined shape improvement of the workpiece. A machining or chipping with an undefined cutting edge is carried out. This surface finishing belongs in the same category as grinding or lapping. In contrast to grinding, in which rotating tools are used to abrade the workpiece surface, or lapping, which uses loose material, the short-stroke honing process has the following characteristics:
An oscillating honing stone is pressed against a moving workpiece surface with a specific force, whereby, through the grinding effect of the honing stone, the workpiece surface is abraded. The roughness of the workpiece diminishes very quickly during the abrasion process. At the same time, however, the surface of the workpiece influences the surface of the honing stone, whereby the honing stone itself erodes. Long-stroke and short-stroke are the two different methods of honing. Long-stroke honing is often simply referred to as "honing", which makes differentiation between the two all the more difficult. Short-stroke honing is also known as "fine honing", "superfinishing" or "microfinishing". In short-stroke honing, the kinematics of the process and the resulting technological abrasion mechanisms between tool and workpiece differ greatly from the characteristics of long-stroke honing. Therefore, the two processes must be clearly separated. Short-stroke honing differs from long-stroke honing first through a much lower oscillation stroke (0.5 mm to 7 mm compared to strokes of 30 mm and more), and secondly through a higher oscillation frequency.
A further difference between the two processes is that surface refinement is the primary goal of short-stroke honing, whereas with long-stroke honing, the greatest possible surface abrasion per unit time plus surface refinement are desired. Due to the greater abrasion per unit time, a greater roughness necessarily results with long-stroke honing than does with short-stroke honing. In contrast to previous state-of-the-art short-stroke honing, long-stroke honing can be used with positive or form-locking connection or friction-type connection. The positive connection method of long-stroke honing allows better form correction over the friction-type connection
REFERENCES:
patent: 4478009 (1984-10-01), Rukavina
patent: 4558537 (1985-12-01), MacLeod et al.
Rose Robert A.
Supfina Maschinenfabrik Hentzen GmbH & Co. KG
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