11/22/2023 0 Comments 1024 thread forming tapsThe thread-forming tap of claim 19, wherein the elongated working portion further comprises at least one longitudinally-extending linear groove intersecting the at least one helical thread.Ģ1. A thread-forming tap defining a longitudinal axis, a first end, and a second end disposed axially away from the first end, the tap comprising: a shank disposed at the first end and adapted to engage a tool holder and an elongated working portion disposed at the second end comprising: at least one thread disposed helically about the working portion and a plurality of lobes disposed on the at least one thread about the longitudinal axis, wherein adjacent lobes differ from one another in at least one of relief type and relief rate.Ģ0. The thread-forming tap of claim 1, wherein the plurality of grooves are disposed generally axisymmetrically about the longitudinal axis.ġ9. The thread forming tap of claim 15, wherein the entry taper is between about 3 and about 5 thread pitches long.ġ8. The thread-forming tap of claim 15, wherein the entry taper is between about 1 and about 10 thread pitches long.ġ7. The thread-forming tap of claim 1, wherein the at least one helical thread defines an entry taper at the second end.ġ6. The thread-forming tap of claim 1 further comprising at least one coolant channel collinear with the longitudinal axis and terminating in at least two radial coolant holes in at least two of the linear grooves.ġ5. The thread-forming tap of claim 1 further comprising at least one coolant channel collinear with the longitudinal axis and terminating in at least one axial coolant hole at the second end.ġ4. The thread-forming tap of claim 9, wherein the cross-section comprises at least 8 lobes.ġ3. The thread-forming tap of claim 9, wherein the cross-section comprises at least 6 lobes.ġ2. The thread-forming tap of claim 9, wherein the cross-section comprises at least 4 lobes.ġ1. The thread-forming tap of claim 1, wherein a cross-section taken helically along the thread comprises an even number of lobes.ġ0. The thread-forming tap of claim 6, wherein adjacent lobes form an alternating pattern of first eccentric reliefs having a first eccentric relief rate and second eccentric reliefs having a second eccentric relief rate, the first and second relief rates being different from one another.ĩ. The thread-forming tap of claim 6, wherein adjacent lobes further differ from one another in relief type.Ĩ. The thread-forming tap of claim 1, wherein adjacent lobes differ from one another in relief rate.ħ. The thread-forming tap of claim 3, wherein a cross-section taken helically along the thread defines a virtual circle, and wherein concentric margins are cocircular with the virtual circle and the apexes intersect the virtual circle.Ħ. The thread-forming tap of claim 3, wherein the concentric margin subtends an angle θ 1 in the range of about 0.5° to about 10°.ĥ. The thread-forming tap of claim 1, wherein adjacent lobes define an alternating pattern of lobes having con-eccentric relief and lobes having eccentric relief, the con-eccentric relief defining lands having a concentric margin central thereto and the eccentric relief defining apexes central thereto.Ĥ. The thread-forming tap of claim 1, wherein the relief type is selected from the group consisting of zero relief, con-eccentric relief and eccentric relief.ģ. A thread-forming tap defining a longitudinal axis, a first end, and a second end disposed axially away from the first end, the tap comprising: a shank disposed at the first end and adapted to engage a tool holder and an elongated working portion disposed at the second end comprising: at least one thread disposed helically about the working portion a plurality of longitudinally-extending linear grooves disposed about the longitudinal axis, the linear grooves intersecting the at least one helical thread and a plurality of lobes formed by the intersection of the linear grooves with the at least one thread, wherein adjacent lobes differ from one another in at least one of relief type and relief rate.Ģ.
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