Abrading – Machine – Rotary tool
Patent
1996-06-05
1998-06-09
Rose, Robert A.
Abrading
Machine
Rotary tool
451299, 451301, 451303, B24B 700
Patent
active
057625425
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an edge grinding device for mechanically rounding edges of structural members which are passed through said edge grinding device, comprising a main frame having, in relation to the direction of travel, transversally extending support rollers upon which the structural member is supported and is driven forward.
An edge grinder of this type is known from NL-9002175.
The purpose of the invention has been to provide a machine for rounding off edges of structural members, such as rolled steel sections and sheets. Today it is a requirement in offshore structures that all edges of steel sections have a radius of curvature of at least 2 mm and sometimes more. This is due to maintenance and corrosion protection. So far, this rounding-off procedure has usually been carried out manually by means of an angular grinder or facing machine.
It is documented by tests that the principle on which the present edge grinding device is based provides a very good quality in the rounding off of steel section edges and far exceeds the quality achieved today by angular grinders.
In accordance with the present invention there has been provided an edge grinding device of the introductory part of this description, characterized by having at least one grinding aggregate with a movable grinding element, said grinding aggregate being pivotally mounted on a frame about an axis which runs substantially parallel to the advancement axis of the structural member, said pivotal axis being located outside the structural member, that the cross-sectional profile of the grinding element has a predetermined geometric form adapted to the location of the pivotal axis and the radius of curvature of the rounding of the edges, and that the grinding element is pressed yieldingly or resiliently against the edge.
Such a design entails, inter alia, that the grinding element will be worn down evenly throughout its entire crosswise area, thus providing a long useful lifetime to the individual grinding element before replacement.
It is contemplated that the grinding aggregate can be in the form of a motor operated grinding wheel having a predetermined geometrically configured surface, but it has proved to be advantageous that the grinding aggregate is in the form of a belt grinder or belt sander in which a grinding belt or sand belt runs between and around two rollers.
Even though it is actually unnecessary to have more than one grinding aggregate for each edge grinding device, such an aggregate may advantageously be mounted on each side of the structural member for simultaneous grinding of two edges.
Advantageously, two more grinding aggregates may be mounted on each side of the structural member downstream of the first grinding aggregate or the first pair of grinding aggregates, for simultaneous grinding of two additional edges in one run, such as grinding edges of steel beams having an I or H section.
The edge grinding device may advantageously comprise vertically and horizontally mounted guiding rollers for controlled guidance of the structural member through the edge grinding device. Advantageously, the grinding aggregate may comprise air nozzle means for air supply and for the formation of an air cushion between the grinding shoe of the grinding aggregate and the grinding belt, so as to reduce the friction and/or cool the grinding belt.
It is expedient that each grinding aggregate has an independent power or motor operation. Further, each grinding shoe can be pressed against the edge or be raised or lowered by an apparatus, such as a fluid powered cylinder, for the purpose of regulating the grinding pressure, and thus provide a yielding or a certain resiliency in relation to the edges of the structural member so as to absorb any roughness therein, simultaneously with the grinding element being fed toward the edge as the metal is ground away.
Each grinding aggregate is advantageously pivotable by means of a link mechanism and a fluid power cylinder about said pivotal axis, thus making a kind of pendulum movement.
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REFERENCES:
patent: 3715839 (1973-02-01), Hesemann
patent: 3845588 (1974-11-01), Huffman, Jr.
patent: 4119015 (1978-10-01), Tuda et al.
patent: 4471822 (1984-09-01), Griganavicius
patent: 4628640 (1986-12-01), Johannsen
patent: 5163249 (1992-11-01), Kantanen
patent: 5295329 (1994-03-01), Rothlisberger
patent: 5492498 (1996-02-01), Casillas et al.
Grobi A/S
Nguyen George
Rose Robert A.
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