Hertel Ag Werkzeuge+hartstoffe

Franz Glaser

A tool changeover holder for machine tools has a rotationally driven spindle and a replaceable tool head that can be fixed thereto. The rotationally driven spindle has on the tool side a central journal, a chucking devoce and an annular face that surrounds this concentrically. The tool head has a central drilling to accommodate the spindle journal and an annular matching surface that surrounds the drilling concentrically. The spindle face and the matching surfaces have inversely congruent centering and torque-transmitting means that engage in each other in the chucked position. Hirth serration elements are arranged on the face of the spindle in a plurality of annular-sector shaped serration sections that lie on an annulus that is concentric with the axis of the spindle. These are separated from each other by the flat contact surface sections.

Tool-changeover holder

An apparatus to change and chuck a tool head incorporates a chucking system that is arranged in a recess in the drive spindle that chucks a tool-head shank that can be inserted into the accommodating opening. The chucking system incorporates a grip with an axially displaceable spreader and radial guide drillings that accommodate lock balls. The tool-head shank is configured as an annular cylinder and provided with an inside annular groove on the inclined groove side wall of which locking elements, that are arranged on the grip and can be forced apart in a radial direction, outside the lock balls on the grip, interact with corresponding locking surfaces both in the locking direction and in the direction of spread.

Changing and chucking tool

In a chuck for clamping a tool (1) into a carrier (2), a shank (3) is provided in the tool (1) and a mating bore (4) in the carrier (2). The shank (3) is insertable into the mating bore (4) and can be fixed there. To fix it, a locking element (7) is displaceably mounted in a radial transverse recess (6) of the shank (3) and its two front ends are provided with planar slopes (9, 10). Both slopes (9, 10) form an acute angle (11) which closes in the direction toward the tool (1). The chuck is tightened by means of pressure screws (15) which are screwed radially into an annular flange (12) of carrier (2) surrounding bore (4). The pressure element of the pressure screws (15) is a ball (14) having a truncation surface (13) which, when positioned in the same plane, charges the opposing slope (9, 10) of the locking element (7).

Chuck

In a rapid release chucking device, particularly for drills, including a machine spindle (1) and a tool head (2) attached thereto in a manner secure against rotation, wedge faces (9) are provided at the circumference of a spreadable ring element (14). In the unspread state, this ring element lies withdrawn in an annular groove (15) surrounding the spindle end (3). A control slide (16) is mounted in the spindle (1) so as to be axially displaceable by an externally initiated displacement movement. A plurality of spreading elements (18) lie in openings (17) which radially penetrate the spindle end (3) and open into the annular groove (15). Axial displacement of control slide (16) causes the openings to be urged radially outwardly toward the inner ring wall (19) of the ring element (14). At the same time, the inner wedge faces (9) of the ring element are urged against a corresponding, conical inner ring flank (24), into position where the wedge is tightened.

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Nuremberg, Germany

Franz Glaser