Tipped disc blades balancing with improved producibility
AssigneeC.M.T. Utensili S.P.A.
InventorPiergiorgio Pozzo
Life of this patent
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Abstract
A method for balancing disc blades comprising the steps of: determining the initial position of the center of mass of the disc blade to be balanced with respect to its main axis; calculating/determining the number, the position and/or the dimensions of one or more balancing holes eccentric with respect to said main axis and necessary for removing an amount of material sufficient to bring the center of mass of the disc blade at a distance from the main axis lower than a predetermined maximum limit value; and forming said balancing hole or holes on the central disc in an eccentric position with respect to said main axis. The method improves the producibility of disc blades.
Claims17
A method for balancing of disc blades which are adapted to rotate about a given main axis and which comprise a central disc and a series of protruding teeth jutting out cantilevered from the perimeter edge of the central disc, said method comprising the steps of:
- determining the initial position of the center of mass of the disc blade to be balanced with respect to said main axis;
- undertaking one of the steps of calculating and determining at least one of the number, the position, and the dimensions of at least one balancing hole eccentric with respect to said main axis to develop an indication of at least one of an amount of material to be removed from the disc blade sufficient to bring the center of mass of the disc blade-to a distance from the main axis less than a predetermined maximum limit value;
- and
- forming said at least one balancing hole on the central disc in an eccentric position with respect to said main axis;
- wherein the step of determining the initial position of the center of mass of the disc blade-comprises the steps of:
- rigidly locking the disc blade to be balanced on a blade-holder spindle rotatable about a spindle rotation axis so that the main axis of the disc blade is coincident with the spindle rotation axis;
- driving the blade-holder spindle into rotation about the spindle rotation axis so as to bring the disc blade into rotation about said main axis;
- and
- determining at least one of the state and degree of initial eccentricity of the center of mass of the disc blade;
- and
- wherein the step of forming said at least one balancing hole on the central disc comprises the steps of:
- stopping the blade-holder spindle at least in a first previously-calculated angular position so as to align a predetermined first point of the central disc to a drilling assembly;
- and
- undertaking one of the steps of driving and commanding a moving apparatus of the drilling assembly so as to form, at said predetermined first point of the central disc, a balancing hole that extends parallel to said main axis.
A machine for balancing of disc blades, comprising:
- a ground-resting and self-supporting rigid structure;
- a blade-holder spindle which is fixed to the rigid structure with the capability of freely rotating about a rotation axis, and is adapted to support and rigidly lock a disc blade arranging it coaxial to the rotation axis on a laying plane perpendicular to said rotation axis;
- a motor assembly which is adapted to drive the blade-holder spindle into rotation about the rotation axis;
- an electronic detecting device which is located on the blade-holder spindle and is adapted to detect the unbalancing of the disc blade engaged on the blade-holder spindle;
- a drilling assembly which is fixed to the self-supporting rigid structure beside the blade-holder spindle, with the capability of moving from and towards said laying plane in a direction parallel to said rotation axis;
- and a moving apparatus which is adapted to move, on command, the drilling assembly from and towards said laying plane so that the drilling assembly can reach and pierce the disc blade temporarily fitted on the blade-holder spindle, in order to form one or more balancing holes on said disc blade.
A disc blade adapted to rotate about a central axis thereof and comprising a central disc and a series of protruding teeth jutting out cantilevered from the perimeter edge of the central disc;
- said disc blade being additionally comprising at least one balancing hole that is formed on the central disc in an eccentric position with respect to said central axis and extends parallel to the central axis wherein the at least one balancing hole has a diameter no greater than one of 15 millimeters and 6 millimeters.
Dependencies are inferred from the claim text.