Grinding tool

A CNC machine comprising:

• a first grinding tool;
• a second grinding tool;
• and
• a control program,
• wherein:
• each of the first grinding tool and the second grinding tool is configured to machine an inside surface of a cylinder bore in a workpiece;
• each of the first grinding tool and the second grinding tool has an axis of rotation;
• the first grinding tool has a grinding region which is cylindrical with respect to the axis of rotation of the first grinding tool;
• the second grinding tool has a grinding region which is conical with respect to the axis of rotation of the second grinding tool;
• the first grinding tool and the second grinding tool are separate and distinct such that only one of the first grinding tool and the second grinding tool is configured to rotate at a time;
• a diameter of the grinding region of the second grinding tool increases in an axial direction of the second grinding tool starting from a smallest diameter of the grinding region of the second grinding tool which corresponds to a diameter of the grinding region of the first grinding tool which is separate and distinct from the second grinding tool;
• the second grinding tool has a free end and an opposite end, and the grinding region of the second grinding tool adjoins the free end on the second grinding tool;
• the second grinding tool includes a flange configured to fix the second grinding tool to:
• (i) a machining head of a CNC machine;
• or (ii) an adaptor connected to the machining head of the CNC machine;
• the flange is formed at the opposite end of the second grinding tool;
• and
• the control program is adapted to:
• introduce at least one of the first grinding tool and the second grinding tool into the cylinder bore in the workpiece;
• move the at least one of the first grinding tool and the second grinding tool to the inside surface of the cylinder bore in the workpiece;
• guide the at least one of the first grinding tool and the second grinding tool at least once in a circle along the inside surface of the cylinder bore in the workpiece, in which case the at least one of the first grinding tool and the second grinding tool rotates about the axis of rotation of the at least one of the first grinding tool and the second grinding tool;
• lift the at least one of the first grinding tool and the second grinding tool off the inside surface of the cylinder bore in the workpiece;
• and
• move the at least one of the first grinding tool and the second grinding tool out of the cylinder bore in the workpiece again.

A set comprising:

• a first grinding tool;
• and
• a second grinding tool,
• wherein:
• each of the first grinding tool and the second grinding tool is configured to machine an inside surface of a cylinder bore in a workpiece;
• each of the first grinding tool and the second grinding tool has an axis of rotation;
• the first grinding tool has a grinding region which is cylindrical with respect to the axis of rotation of the first grinding tool;
• the second grinding tool has a grinding region which is conical with respect to the axis of rotation of the second grinding tool;
• the first grinding tool and the second grinding tool are separate and distinct such that only one of the first grinding tool and the second grinding tool is configured to rotate at a time;
• a diameter of the grinding region of the second grinding tool increases in an axial direction of the second grinding tool starting from a smallest diameter of the grinding region of the second grinding tool which corresponds to a diameter of the grinding region of the first grinding tool which is separate and distinct from the second grinding tool;
• the first grinding tool has a central bore parallel to the axis of rotation of the first grinding tool;
• the second grinding tool has a central bore parallel to the axis of rotation of the second grinding tool;
• the first grinding tool includes a plurality of passages extending between the central bore of the first grinding tool and the grinding region of the first grinding tool;
• the first grinding tool includes grooves in the grinding region of the first grinding tool;
• the plurality of passages of the first grinding tool open into the grooves in the grinding region of the first grinding tool;
• the second grinding tool includes a plurality of passages extending between the central bore of the second grinding tool and the grinding region of the second grinding tool;
• the second grinding tool includes grooves in the grinding region of the second grinding tool;
• and
• the plurality of passages of the second grinding tool open into the grooves in the grinding region of the second grinding tool.