Boring device

A boring device comprising:

• a hollow main shaft;
• a table supporting the main shaft rotatably about a predetermined axis;
• a tool holder having a spindle extending in the form of a bar, the tool holder being configured to rotate coaxially with the main shaft;
• a radially protruding tool provided at a distal end portion of the spindle of the tool holder;
• a tilting unit provided between the main shaft and the tool holder in the axis direction and configured to incline the tool holder from the axis;
• a drawbar configured to be movable back and forth in the axis direction within the main shaft;
• a first drive unit configured to rotate the main shaft about the axis;
• and
• a second drive unit configured to move the drawbar back and forth in the axis direction,
• wherein the tilting unit includes:
• a coupling member coupled to the drawbar, the coupling member having a fixing portion provided at a position away from the axis in the radial direction and a first abutting surface facing the main shaft side;
• a mounting base arranged between the coupling member and the main shaft so as to be fixed to the main shaft, the mounting base having a second abutting surface that is opposed to the first abutting surface of the coupling member via a gap of a predetermined length in the axis direction;
• and
• a tilting member coupled to the fixing portion of the coupling member, the tilting member having a deformable portion that is elastically deformable toward a side opposite to the fixing portion with respect to the axis, the tilting member being fixed to the mounting base at a position on an outer side of the deformable portion in the radial direction, and the tilting member supporting the tool holder, wherein
• the tilting member is configured to be inclined toward the main shaft side by deformation of the deformable portion.