DE1066099B - Quick release device for rotating, cutting tools, especially grinding tools - Google Patents

Description

GERMAN

Quick clamping devices for quickly changing rotating machining tools are available in many ways Form known. For example, undercut, curved ones are dovetail-like Partial surfaces that are attached to a mounting flange and to the correspondingly designed counterpart, the tool attached. A rotation is required for clamping of 90 ° and more.

As a result, the size of the contact surface used for power transmission is a maximum of 180 ° exciting scope. Since it is also often, especially with cup wheels, hardly possible that Contact surfaces of the flange and tool counterpart that are perpendicular to the axis of rotation are so perfect To shape it so that a perfect mutual contact arises tend to be so tense Tools for fluttering. This fluttering is counteracted on a case-by-case basis by adjusting screws. the Adjustment of such screws, however, takes some time and provides when they serve their purpose is supposed to place considerable demands on the care and feeling of the person hiring, because unevenly tightened set screws press the counterpart tool to be clamped at an angle.

These disadvantages are eliminated according to the invention in that the dovetail-like, undercut, curved clamping surface on the mounting flange and on the counterpart to be determined after a Spiral runs. The flutter is countered according to the invention in that the perpendicular to Axis of rotation The contact surface between the flange and the counterpart is three to one another at 120 ° offset, relatively small sub-areas is divided.

If the undercut curved surface is designed in the form of a spiral, one turn of the clamping is sufficient of a maximum of 30 ° for fastening the tool. The force-transmitting contact surface extends accordingly over an area of 330 ° of the exciting circumference. By increasing the clamping range by 80%> enables the quick clamping of brittle and soft tools. The dovetail-like undercut in cooperation with the spiral clamping surface leads to a good mutual abutment of the three sub-surfaces lying perpendicular to the axis of rotation, whereby fluttering is prevented.

Fast-moving tools also require a rotationally symmetrical weight distribution, which in known way by dividing the undercut curved clamping surface into several congruent ones Partial areas is achieved.

With two congruent parts, the force-transmitting total contact area extends over one Quick clamping device for rotating,

cutting tools,
especially grinding tools

Applicant:

Hans Sebald & Sons oHG,
Marktredwitz (Bay.), Jean-Paul-Str. 1

Josef Ehrenberger, Marktredwitz (Bay.),
has been named as the inventor

Extension of 300 ° of the exciting circumference and with three congruent parts over such of 270 °. The increase compared to the known clamping surfaces extending over 180 ° of the circumference is accordingly 66 ² / s or 50 ° / ».

Even if parts of the spiral clamping surface crumble on brittle bodies, e.g. B. by damage, Due to the large clamping surface, there is still a superior clamping option.

The number of patches perpendicular to the tool axis that prevent flutter remains even in the case of a rotationally symmetrical design, i. H. Division of the curved spiral clamping surfaces into congruent parts unchanged three.

For special cup grinding wheels, their grain and / or bond for reasons of strength possibly no direct arrangement of the spiral undercut surfaces on the grinding wheel is permitted an intermediate piece can be arranged in which the grinding wheel is cemented in a known manner. The intermediate piece can also have the function of a reducer, its spiral clamping surface is designed as a counterpart uniformly to the existing mounting flange, while on the Reducer different sized tools can be attached.

The drawing shows the invention in two embodiments:

Fig. 1 shows the tool in section along the line AB of Fig. 2;

Fig. 2 shows the top view of the tool;

909 629/93

Claims (4)

Fig. 3 shows the mounting flange in section along the line C-D of Fig. 4; Fig. 4 shows the top view of the flange; Fig. 5 shows the top view of the flange with the tool clamped in another embodiment, the invention, in which the spiral surface is divided into three congruent parts. 1 is the undercut clamping surface of the tool, the spiral shape of which is selected in size so that it can be inserted into the counterpart 2 of the clamping flange with little play. During insertion, the chest 10 of the tool touches the chest 11 of the flange. When clamping, which is carried out in a known manner by rotating the tool with respect to the flange, the spiral undercut surfaces 1 and 2 touch each other, the backing of which results in a full contact of the perpendicular to the tool axis surface 6 on the protruding three partial surfaces 5 and prevents fluttering . When dividing the spiral undercut clamping surface into several congruent parts, each breast 13 and 14 occurs on the tool and on the flange in the number of spiral parts. After the clamping rotation, only the short sections 7 and 9 are no longer involved in the clamping of the tool. However, the sum of the various clamping sections 8 still ensures a considerable clamping effect. The thread 12 is used to attach the flange to the machine spindle. 15 is a recess that is present in the usual way in cup grinding wheels. Patent claims: 1. Quick clamping device for rotating, cutting tools, especially grinding tools, which are undercut on a flange with the help of interlocking, dovetail-like, curved surfaces are attached, characterized in that the undercut, curved clamping surface (1 and 2) on the tool and on the flange runs in a spiral. 2. Quick release device according to claim 1, characterized in that the undercut spiral surface (1 and 2) to achieve ¹ uniform weight distribution both on the tool and on the flange in known, curved clamping surfaces is usually divided into several congruent parts (8). 3. Quick release device according to claims 1 and 2, characterized in that the Support surface on the flange, perpendicular to the axis of rotation, consists of three at an angle of 120 ° mutually arranged, smaller protruding bearing surfaces (5) and on the tool from one closed ring surface (6). 4. Quick release device according to claims 1 to 3, characterized in that the Tool is connected in a known manner with an intermediate piece that the flange has corresponding spiral surface. Considered publications:
German Patent No. 833 577;
British Patent No. 383,518;
U.S. Patent Nos. 1,661,861, 1,856,321. 1 sheet of drawings © 909 629/93 9.59