Saw blade with non-magnetic inserts for electric arc saw and method of making same
AssigneeRetech, Inc.
InventorMax P. Schlienger
Life of this patent
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Abstract
An electric arc saw blade having improved magnetic characteristics and economy including a metallic disk composed of a high strength, electrically conductive material having secured to its periphery a plurality of non-magnetic inserts composed of a second material having a relatively high electrical conductivity. The inserts are placed in radially oriented notches of the disk which define undercuts, engaged by the inserts, to transfer centrifugal forces from the insert to the high strength disk. The inserts also have grooves which engage the face of the disk rigidly to secure the inserts to the disk. The inserts are installed by cold-working or brazing and they are readily removed and replaced with new ones to thereby substantially increase the life span of the blade.
Claims23
An electric arc saw blade comprising a central disk made of a first, relatively high strength, electrically conductive material, a plurality of discrete inserts made of a second, relatively low strength, electrically conductive and non-magnetic material, and means for locking the inserts to the disk.
An electric arc saw blade comprising a disk made of a first electrically conductive material, a plurality of inserts made of a second electrically conductive non-magnetic material and secured to the disk along the periphery thereof, the inserts having a thickness greater than a thickness of the disk and being arranged so as to overhang each side of the disk substantially equally.
An electric arc saw blade comprising a disk having a multiplicity of serially arranged, peripherally open notches, each notch being defined by opposing edges forming undercuts adjacent an innermost end of the notch, the disk being constructed of a relatively high strength material having relatively low thermal and electrical conductivities;
- an insert in each notch having a shape complementary to the shape of the notch so that a radially inwardly disposed section of the insert extends into the undercuts, groove means formed along a periphery of the insert into which the opposing edges of the notch at least partially extend so as to provide lateral rigidity between the disk and the insert, the insert having a thickness greater than the thickness of the disk and protruding past side faces of the disk, the insert being further constructed of a relatively malleable, non-magnetic material having relatively higher electrical and thermal conductivities than the disk, and wherein a portion of the insert is secured in place into tight engagement with a portion of the disk defining the notch so as to form a rigid, mechanical interlock between the insert and the blade.
An electric arc saw blade comprising a disk having a multiplicity of serially arranged, peripherally open notches, each notch being defined by opposing edges, the disk being constructed of a relatively high strength material having relatively low thermal and electrical conductivities;
- an insert in each notch having a shape complementary to the shape of the notch, groove means formed along the periphery of the insert into which th opposing edges of the notch at least partially extend so as to provide lateral rigidity between the disk and the insert, the insert having a thickness greater than the thickness of the disk and protruding past side faces of the disk, the insert being further constructed of a non-magnetic material having relatively higher electrical and thermal conductivities than the disk, and wherein a portion of the insert is secured in place to a portion of the disk defining the notch so as to form a rigid, mechanical interlock between the insert and the blade.
A method for producing a high speed electric arc saw blade comprising the steps of providing a central disk defining an axis of rotation and made from a material having a relatively high yield strength, forming a multiplicity of spaced apart notches along a periphery of the disk, each notch extending in a generally radial direction from the periphery of the disk towards the axis and ending in a base, the notch having an undercut proximate the base which has a width in the direction of rotation of the blade which is greater than a width of the notch at a point radially outward from the undercut, providing a non-magnetic insert for each notch having a thickness greater than the thickness of the disk and a shape corresponding to the shppe of the notch so that the insert can be positioned in the notch, and shaping the insert so that it engages the undercut and both faces of the disk in areas contiguous with the notch to thereby substantially rigidly and immovably, mechanically lock the insert to the disk, the shaping step being at least partially performed after the insert has been positioned in the notch by subjecting the insert to pressures which cause it to be cold-formed.
A method for producing a high speed electric arc saw blade comprising the steps of providing a central disk defining an axis of rotation and made from a material having a relatively high yield strength, forming a multiplicity of spaced apart notches along a periphery of the disk, each notch extending in a generally radial direction from the periphery of the disk towards the axis and ending in a base, the notch having an undercut proximate the base which has a width in the direction of rotation of the blade which is greater than a width of the notch at a point radially outward from the undercut, providing a non-magnetic insert for each notch having a thickness greater than the thickness of the disk and a shape corresponding to the shape of the notch so that the insert can be positioned in the notch, and securing the insert to the disk by a low-temperature brazing method creating a rigid connection between the insert and the disk.
Dependencies are inferred from the claim text.