Device for securing a boring bar

A fixing device for fixing a boring bar on a material-removing machine, the fixing device comprising:

• a reducing sleeve which is fixed in a machine chuck, the reducing sleeve comprising a longitudinal recess and a hollow profile which is arranged on a front face of the reducing sleeve which faces away from the machine chuck, the hollow profile comprising an interior which is coaxial with an axis of the reducing sleeve,
• wherein,
• the hollow profile is inserted and fixed in the longitudinal recess of the reducing sleeve,
• the boring bar projects axially along the axis of the reducing sleeve at a front end which faces away from the machine chuck,
• the machine chuck and the boring bar rotate about a same axis of rotation,
• the boring bar comprises an outer projecting end region which is configured to carry a cutting tool, and an outer wall which comprises a cylindrical boring bar outer wall and a flattened outer wall region, and
• the cylindrical boring bar outer wall is cylindrical with a boring bar axis of rotation as a cylinder axis with the exception of the flattened outer wall region of the outer wall, the cutting tool projecting from the boring bar at an end of the flattened outer wall region and the flattened outer wall region being arranged between the reducing sleeve and the cutting tool so that, in the flattened outer wall region, the outer wall has a first radius which is less than a second radius of the outer wall at the cylindrical boring bar outer wall.

A system for removing material, the system comprising:

• a material-removing machine comprising a machine chuck;
• a boring bar;
• and
• a fixing device for fixing the boring bar on the material-removing machine, the fixing device comprising a cylindrical reducing sleeve which is configured to be fixed in the machine chuck of the material-removing machine, the cylindrical reducing sleeve comprising a longitudinal recess and a hollow profile which is arranged on a front face of the cylindrical reducing sleeve which faces away from the machine chuck, the hollow profile comprising an interior which is coaxial with an axis of the cylindrical reducing sleeve,
• wherein,
• the boring bar is configured to be received in the interior of the hollow profile, the boring bar comprising an end region which is arranged to project from the hollow profile and to carry a cutting tool,
• the hollow profile further comprises a wall which is configured to stabilize the boring bar, the wall being arranged between the interior of the hollow profile and an exterior of the hollow profile, the wall comprising a first thickness and at least a second thickness the first thickness being less than the second thickness, wherein the first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar,
• a longitudinal axis of the hollow profile is arranged to be axially parallel to and at a distance from the axis of the cylindrical reducing sleeve which is coaxial with the boring bar, and
• the hollow profile is inserted and fixed in the longitudinal recess of the cylindrical reducing sleeve.

A fixing device for fixing a boring bar on a material-removing machine, the fixing device comprising:

• a cylindrical reducing sleeve configured to be fixed in a machine chuck, the cylindrical reducing sleeve comprising a hollow profile which is arranged on a front face of the cylindrical reducing sleeve which faces away from the machine chuck, the hollow profile comprising an interior which is coaxial with an axis of the cylindrical reducing sleeve,
• wherein,
• the boring bar is configured to be received in the interior of the hollow profile, the boring bar comprising an end region which is arranged to project from the hollow profile and to carry a cutting tool,
• the hollow profile further comprises a wall which is configured to stabilize the boring bar, the wall being arranged between the interior of the hollow profile and an exterior of the hollow profile, the wall comprising a first thickness and at least a second thickness, the first thickness being ½ to 1/30 of the second thickness, wherein the first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar, and
• a longitudinal axis of the hollow profile is arranged to be axially parallel to and at a distance from the axis of the cylindrical reducing sleeve which is coaxial with the interior of the boring bar.