Method for deburring the edges of intersecting boreholes, and tool for implementing the method

A method for operating a deburring tool for the reverse deburring of borehole edges that have a straight or un-round shape, comprising of a base body which is rotatably driven about its longitudinal axis, and at the lower end of which at least one blade holder with at least one deburring blade secured therein is mounted on a blade bearing on the base body side so as to swivel vertically about an axis generally perpendicular to the longitudinal axis of the base body, and on the outer periphery of the blade holder a control groove which is open radially outward is arranged, into which the free end of a flexible cantilever beam spring engages, the other end of said cantilever beam spring being clamped to the base body, wherein during the deburring process, the deburring blade is swiveled radially outwardly away from the base body at an angle in relation to the longitudinal axis of the base body, and the blade axis of the deburring blade rests, spring-loaded, with its at least one cutting edge against the borehole edge to be deburred, and executes spring-loaded swiveling movements that follow the contour of the borehole edge as the deburring tool is rotated, wherein:

• in a first method step, the deburring tool is moved, concentrically with the cross bore axis of a cross bore to be deburred, up to the cross bore until a sliding bearing at the front, unattached end of the bar-shaped deburring blade is located just outside of the cross bore,
• in that in a second method step, the forward feed movement is interrupted as soon as the sliding bearing is at the front edge of the cross bore,
• in that in a third method step, the deburring tool executes a movement in the transverse direction to move the deburring tool eccentrically and transversely to the cross bore axis until radial clearance is achieved between the deburring blade, which is swiveled away from the deburring tool, and the cross bore,
• in that in a fourth method step, the deburring tool is introduced further longitudinally into the cross bore until the sliding bearing has just entered into the cross bore,
• in that in a fifth method step, the deburring tool is moved back in the transverse direction in order to bring the longitudinal axis of the deburring tool in alignment with the cross bore axis of the cross bore,
• in that in a sixth method step, longitudinal movement is continued until the deburring tool is moved forward into its starting position at the start of the deburring process,
• and in that in a seventh method step, proceeding from this starting position, the deburring tool is rotationally driven and executes the deburring process, wherein as the deburring tool is moved back in the vertical direction, the deburring blade rests with its cutting edge against the inner side of the cross bore, and executes a deburring, advancing circumferentially, of the inner edge of the cross bore.

A method for operating a deburring tool for the forward deburring of borehole edges that have a straight or un-round shape, comprising of a base body which is rotatably driven about its longitudinal axis, and at the lower end of which at least one blade holder with at least one deburring blade secured therein is mounted on a blade bearing on the side of the base body so as to swivel vertically about an axis generally perpendicular to the longitudinal axis of the base body, and on the outer periphery of the blade holder a control groove which is open radially outward is arranged, into which the free end of a flexible cantilever beam spring engages, the other end of said cantilever beam spring being clamped to the base body, wherein during the deburring process, the deburring blade is swiveled radially outwardly away from the base body at an angle in relation to the longitudinal axis of the base body, and the blade axis of the deburring blade rests, spring-loaded, with its at least one cutting edge against the borehole edge to be deburred, and executes spring-loaded swiveling movements that follow the contour of the borehole edge as the deburring tool is rotated, wherein:

• in a first method step, the deburring tool is moved, concentrically with the cross bore axis of a cross bore to be deburred, up to the cross bore until a sliding bearing at the front, unattached end of the bar-shaped deburring blade is located just outside of the cross bore,
• in that in a second method step, the forward feed movement is interrupted as soon as the sliding bearing is at the front edge of the cross bore,
• in that in a third method step, the deburring tool executes a movement in the transverse direction to move the deburring tool eccentrically and transversely to the cross bore axis until radial clearance is achieved between the deburring blade, which is swiveled away from the deburring tool, and the cross bore,
• in that in a fourth method step, the longitudinal movement is continued until the deburring tool has been moved forward into its starting position at the start of the deburring process,
• and in that in a fifth method step, proceeding from this starting position, the deburring tool is rotationally driven and executes the deburring process, wherein as the deburring tool is moved forward in the vertical direction, the deburring blade rests with its cutting edge against the outer side of the cross bore, and executes a deburring, advancing circumferentially, of the outer edge of the cross bore.