SE507963C2 - Tensioning magnetisable metal ring on magnetic table for planing flat sides of ring - Google Patents

Abstract

Method of tensioning a magnetisable metal ring on a magnetic table for planing the flat sides of the ring comprises the steps of insertion of at least three intermediate bodies between the ring and table, together with the firm application of at least three support blocks against the ring mantle surface. The support blocks have at least one side coated with plastics or rubber.

Description

507 963 4 CLAIMS 1. Method for clamping a magnetizable metal ring on a magnetic table for planar grinding of the flat side surface of the ring, comprising placing spacers between the ring and the magnetic table and placing support blocks for abutment against the ring for fixing the position of the ring on top of the spacers, k characterized by - fitting of three inserts (3) of magnetizable material and with a thickness of about 1 mm, with approximately equal mutual distances distributed between the ring (1) and the magnetic table (2), - fitting of three support blocks (4) of magnetizable material for tight abutment against the outer mantle surface of the ring, the side of the support block abutting the ring having a friction-promoting or braking layer (5), preferably of rubber, and - activation of the magnetic table whereby the ring is fixed by the small thickness of the spacers, partly by the table's attractiveness the abutment of the support blocks against the outside of the ring. Method according to claim 1, characterized in that the layer (5) is a hard rubber layer, ground ground to a right angle to the base surface of the support block. 507 963 3 on its mantle surface. As in the example shown, displacing the ring J. so that a portion of its circumference is located outside the magnetic table 2 facilitates control measurement of the axial length of the ring.

With the above-described clamping of the ring 1, where the ring rests only at three points against the ground, it is achieved that movements of the ring during grinding due to irregularities in the side surface on which the ring rests can be completely eliminated. The support blocks 4, which are close to the mantle surface of the ring and perpendicular to the magnetic table, effectively help to prevent dislocation of the ring 1 during grinding.

In a first step, one side surface of the ring is then ground until about 1/10 mm remains of the material, after which the ring is detached from the magnetic table and laid to rest on a non-conductive surface, for example on the floor. After a certain time, varying depending on the material in the metal ring, due to the hysteresis effect, sufficient magnetism remains in the ring for it to sit firmly on the magnetic table without this being activated. The ring is then easy to straighten, after which the magnetic table is activated and the grinding work is completed.

It should be noted here that the above-mentioned clamping method is primarily intended for use in planar grinding of the first side surface of the ring 1. When this is completed, the ring can be clamped in a conventional manner on the magnetic table for grinding the opposite side surface.