Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1988-12-21
1991-04-23
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51 17, 51263, 51328, 51DIG10, B24B 1900
Patent
active
050090372
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to sheet rolling, and more particularly to an apparatus for descaling the surface of a strip.
DESCRIPTION OF THE PRIOR ART
There is known an apparatus for descaling the surface of a strip by abrasive powder disclosed in SU, A No. 902,378 (International Patent Application PCT/SU No. 84/00029). This apparatus comprises a working chamber having an inclined bottom charged at the side with an abrasive powder and accommodating two oppositely arranged powder compacting mechanisms having working members in the form of vanes facing the vertical plane where-along the strip is conveyed.
This apparatus is characterized by the following. Charging the powder sideways complicates uniform filling of the space between the working members of the powder compacting mechanisms and the strip being descaled, whereby the pressure of powder on the strip can be non-uniform across the strip because of various degrees of compacting the powder, which affects the quality of strip descaling process.
The powder fills the entire space inside the working chamber rather than only the working space, whereby the powder compacting mechanisms are fully immersed in the mass of powder, and as they are moved (for bringing the working members together) a substantial part of the drive power is expended for overcoming the forces of friction between these mechanisms and the powder. This reduces the efficiency of the drive and the magnitude of the useful force which eventually leads to high power consumption and affects descaling quality due to insufficient useful force.
As continuity of the descaling process necessitates at least two pairs of alternately operating powder compacting mechanisms, this prior art apparatus envisages the use of two similar chambers arranged one above the other to complicate the apparatus in construction and servicing, and hamper the circulation of powder through the chamber.
There is also known an apparatus for descaling the surface of a strip by abrasive powder as disclosed in International Patent Application PCT/SU No. 86/00074. This apparatus, viewed by us as a prototype, comprises a working chamber to be filled with an abrasive powder accommodating two pairs of powder compacting mechanisms arranged one above the other with working members of these mechanisms facing the plane along which the strip is pulled through the chamber. Means for charging the abrasive powder are provided at the top of the working chamber, whereas valves for discharging the powder are made at the bottom part of the working chamber. These modified features of the prototype apparatus provide the following advantages versus the prior art.
Filling the working chamber with the powder and discharging the powder therefrom are facilitated due to making use of the shortest possible path, viz., in a top-to-bottom direction under the action of the forces of gravity.
Another advantage is the possibility of arranging several (at least two) alternately operating powder compacting mechanisms in one chamber thereby making the apparatus simpler in construction and cheaper in operation.
However, as in the prior art apparatus, in the prototype apparatus the powder compacting mechanisms are surrounded with the powder, whereby high amounts of power are required for turning these mechanisms (to bring the mechanisms together and descale the strip) to affect the descaling quality due to reduced useful force of compression of the powder to the strip.
Further, the bottom powder compacting mechanisms function under conditions other than those for the top mechanisms, since the powder falls from above onto the bottom powder compacting mechanisms from the space between the working members of the top powder compacting mechanisms already partially fouled with scale. This also makes descaling non-uniform in terms of the length of the strip.
In addition, the volume of powder in the space between the working members of the powder compacting mechanisms taking part in the descaling process is not over 10% of the total volume of the po
REFERENCES:
patent: 2131767 (1938-10-01), Turnbull
Danilov Leonid I.
Garber Eduard A.
Ivoditov Albert N.
Lipukhin Jury V.
Pavlov Valentin P.
Schmidt Frederick R.
Schwarzmann John R.
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