Punch tool head and twist-lock profile

A method of producing a profile in a piece of material, comprising:

• translating a punch tool along a path of motion towards a piece of material, wherein a punch head is coupled to the punch tool, wherein the punch head comprises:
• a protrusion, wherein the protrusion is disposed on a first side of the punch head, wherein the protrusion is disposed at a central location and extends away from the first side, wherein the protrusion has a circular cross-sectional shape;
• and
• one or more interlocking feature producing protrusions, wherein the one or more interlocking feature producing protrusions are disposed on the first side of the punch head, wherein each of the one or more interlocking feature producing protrusions comprise:
• a raised section;
• a middle section disposed adjacent to the raised section in a lateral direction;
• and
• a fillet disposed at an opposite side of the middle section from the raised section and following a convex functional curve,
• wherein each of the raised section, the middle section, and the fillet extend from the first side of the punch head, wherein the middle section is disposed between the raised section and the fillet, wherein the raised section has a greater height than the middle section, wherein each of the one or more interlocking feature producing protrusions comprise an inner side, an outer side, a first end, and a second end, wherein an arc length of the inner side is less than an arc length of the outer side;
• shearing at least a portion of the piece of material;
• and
• seating the punch head against a die disposed in the path of motion of the punch tool.

A method of coupling, comprising:

• rotating a first component with respect to a second component, wherein the first component and the second component each comprise a profile, wherein the profile comprises a central hole, one or more interlocking openings, and one or more flaps, wherein the profile is produced by a punch head comprising:
• a protrusion, wherein the protrusion is disposed on a first side of the punch head, wherein the protrusion is disposed at a central location and extends away from the first side, wherein the protrusion has a circular cross-sectional shape;
• and
• one or more interlocking feature producing protrusions, wherein the one or more interlocking feature producing protrusions are disposed on the first side of the punch head, wherein each of the one or more interlocking feature producing protrusions comprise:
• a raised section;
• a middle section disposed adjacent to the raised section in a lateral direction;
• and
• a fillet disposed at an opposite side of the middle section from the raised section and following a convex functional curve,
• wherein each of the raised section, the middle section, and the fillet extend from the first side of the punch head, wherein the middle section is disposed between the raised section and the fillet, wherein the raised section has a greater height than the middle section, wherein each of the one or more interlocking feature producing protrusions comprise an inner side, an outer side, a first end, and a second end, wherein an arc length of the inner side is less than an arc length of the outer side;
• inserting the one or more flaps of the first component into the one or more interlocking openings of the second component;
• and
• inserting the one or more flaps of the second component into the one or more interlocking openings of the first component.