Machining tool

A machining tool for machining a workpiece by being rotated about an axis, the machining tool comprising:

• a machining blade portion including
• a rake face,
• a first machining blade arranged in a distal end direction of the machining tool with respect to the rake face, and
• a second machining blade arranged with respect to the rake face in a radially outward direction seen from the axis;
• and
• at least one protrusion and at least one second protrusion, wherein each of the at least one protrusion and the at least one second protrusion includes a tip that cuts a chip generated by the first machining blade and is formed on the rake face,
• wherein
• the at least one protrusion and the at least one second protrusion each have a tapered shape that becomes narrower toward the first machining blade in a plan view with respect to the rake face,
• the at least one protrusion and the at least one second protrusion each include
• a first side surface that faces in the radially outward direction,
• a second side surface that is adjacent to the first side surface and faces in a radially inward direction, and
• a top surface that forms an end surface in a protruding direction seen from the rake face,
• the tip is formed at a boundary between the first side surface and the second side surface and extends from the top surface toward the first machining blade,
• a first ridge line is formed between the first side surface and the top surface,
• a second ridge line is formed between the second side surface and the top surface,
• the at least one second protrusion is closest to the second machining blade than the at least one protrusion, and includes
• an inner forming portion located further radially inward than a reference line that is a line passing through the tip and a point of intersection between first ridge line and the second ridge line and is parallel to the axis and
• an outer forming portion located further radially outward than the reference line,
• a width of the inner forming portion is larger than a width of the outer forming portion,
• the first ridge line is located further radially outward than the reference line, and
• the second ridge line is located further radially inward than the reference line.