Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1986-06-10
1988-06-28
Olszewski, Robert P.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51425, 51426, B24C 322, B24C 332
Patent
active
047530510
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a processing method of and its apparatus for processing, utilizing a sandblasting, a workpiece which has a surface not to be processed adjacent a surface to be processed.
BACKGROUND ART
A chamfering of an end edge Wa of a relatively small workpiece W, such as one shown in FIG. 1, and a peripheral edge Wc of a bore Wb therein, has conventionally been performed by a hand process, utilizing a thread-like abrasive tape. However, such method has disadvantages in that it is troublesome, time-consuming and inefficient.
As an automated method of such a processing, a processing method utilizing a sandblasting is proposed in which abrasive grains comprised of, for example, silica sand, chilled cast iron or the like are caused to strongly impinge against a workpiece surface to be processed. However, as in the case of a head for a video signal recording and reproducing apparatus, for example, in which the workpiece W has a f.sub.2 requiring a mirror finish adjacent surfaces f.sub.1 to be processed by the sandblasting, there would be a fear that the abrasive grains of the sandblasting impinge also against the surface f.sub.2 to exert a bad influence thereupon. For this reason, as matters stand, the conventionally general technology does not allow the sandblasting to be adopted for processing of the workpiece W.
Accordingly, an object of the present invention is to provide a processing method which can process, utilizing a sandblasting, a workpiece which has a surface not to be processed adjacent a surface to be processed.
Another object of the present invention is to provide an apparatus utilizing such processing method.
SUMMARY OF THE INVENTION
According to this invention, there is provided a method of processing a workpiece wherein, while blowing fluid against a first portion of the workpiece, abrasive grains are caused to impinge against a second portion of the workpiece, to process only the second portion by the abrasive grains while preventing the abrasive grains from impinging against the first portion by the fluid.
In addition, according to this invention, there is provided a processing apparatus comprising abrasive grain supply means for supplying pressurized fluid containing abrasive grains, fluid supply means for supplying pressurized fluid, a first nozzle for blowing the pressurized fluid against a first portion of a workpiece, and a second nozzle for flowing the pressurized fluid containing the abrasive grains against a second portion of the workpiece.
Furthermore, according to this invention, there is provided a processing apparatus further comprising a vacuum generating means and a suction port connected to the vacuum generating means and opening adjacent the first and second nozzles, so that the injected abrasive grains are drawn.
Moreover, according to this invention, there is provided a processing apparatus characterized in that a collecting means is provided between the suction port and the vacuum generating means for collecting the drawn abrasive grains.
Furthermore, according to this invention, there is provided a processing apparatus wherein the abrasive grains collected by the collecting means are supplied to the abrasive grain supply means so that the abrasive grains are recirculated.
Furthermore, according to this invention, there is provided a processing apparatus wherein a bypass passage capable of being opened and closed is provided between a first abrasive grain path disposed between the abrasive grain supply means and the second nozzle, and a second abrasive grain path disposed between the suction port and the vacuum generating means.
In addition, according to this invention, there is provided a processing apparatus wherein a first valve disposed at a side of the first abrasive grain path downstream of the bypass passage, a second valve for opening and closing the bypass passage, and control means for controlling the opening and closing of the first and second valve are provided, the control means opening the first valve and closing th
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patent: 2628456 (1953-02-01), Berg
patent: 3192677 (1965-07-01), Johnson et al.
patent: 3685208 (1972-08-01), Richter
patent: 3903526 (1975-09-01), Cotter
patent: 4375740 (1983-03-01), Brown
Hamada Shuji
Tano Teruo
Niigata Engineering Co. Ltd.
Olszewski Robert P.
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