Apparatus for working sheet materials with ferromagnetic powder

Details Apparatus for working sheet materials with ferromagnetic powder Apparatus for working sheet materials with ferromagnetic powder

1978-05-30

1980-05-27

Smith, Gary L.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51317, B24B 712

Patent

active

042043700

ABSTRACT:
An apparatus is provided with two rolls made of a magnetically conductive material, spaced to define a passage for a sheet being worked. Either at the first ends, or at both ends of the rolls there are provided means for inducing a magnetic field, so arranged that the magnetic lines extend axially of the rolls and cross the gap therebetween, whereby the rolls act as the opposite pole pieces of a single magnetic system and are designed to retain the ferromagnetic powder which, with the rolls rotating, is pulled through the gap therebetween in a layer used to work the sheet material. The apparatus incorporates a device for levelling out the distribution of the grains of the ferromagnetic powder throughout the length of the gap. The device can be made in the form of a blade positioned to cut off a part of the magnetic powder body at the extremities of the rolls, which enhances the uniform distribution of the grains. The invention also provides for the rolls having tapering portions at their extremities, whereby the magnetic flux density at these extremities is reduced and made substantially equal to the density centrally of the rolls.

REFERENCES:
patent: 588441 (1897-08-01), Kann
patent: 1899463 (1933-02-01), Howard
patent: 2483277 (1949-09-01), Hamilton
patent: 3898769 (1975-08-01), Makedonski et al.
patent: 4040209 (1977-08-01), Shikhirev et al.

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