SU1618523A1 - Arrangement for securing tool in machine spindle - Google Patents

Abstract

The invention relates to a machine tool industry and can be used on machine tools with automated tool change. The aim of the invention is to increase the reliability of fastening the tool in the spindle of the machine. The device contains tu 2 installed in the spindle 1 and connected to the lock 3 by means of a finger 7. The ends of the latter are placed in the slots 8 of the lock, having screw and longitudinal sections, as well as in the longitudinal slots of the housing 12 mounted on the lock and in the spindle hole between the package disc springs and inner end protrusion 14 spindles. Balls 4 are mounted in the radial holes of the lock, and grooves are made in housing 12 for their placement. When the thrust 2 is moved by means of the rod 17, the packet of the disc springs is compressed, and the lock is rotated due to the engagement of the finger 7. The balls 4 are located opposite the grooves 16 and the mandrel b is pushed out from the spindle. When clamping, the ha moves to the left under the action of the springs, the lock rotates in the opposite direction and, in widths, pulls the mandrel into the spindle. The connection of the housing to the lock through a threaded connection 15 provides a fixed clamp mandrel in the spindle. 3 il.

Description

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The invention relates to a machine tool industry and can be used on machine tools with an automated tool change. The purpose of the invention is to increase the reliability of tool fastening in the machine spindle.

Figure 1 shows the device, a general view in section; 2 is a section A-A in FIG. one; on fig.Z - type B. on fig. one.

The device contains a spindle 1 t tu 2 installed in the axial bore, connected to the lock 3, including balls 4 installed in the radial holes, designed to interact with the mushroom-shaped protrusion 5 on the shank of the tool holder 6. The lock 3 is mounted on the rod 2 rotatable and axially movable. A finger 7 is fixed in the radial opening of the gigi, the ends of which are placed in the radial grooves 8 of the lock with screw 9 and longitudinal Yuuchastki, and in the longitudinal grooves 11 of the housing 12. The latter is mounted on the lock with the possibility of relative rotation and axial movement and in the axial hole of the spindle between the package 13 of the disc springs and the inner end protrusion 14, the housing 12 is also connected with the lock 3 by means of a threaded connection 15, the direction of which is opposite to the direction of the helix of the sections 9 grooves 8 in the lock. The body has internal longitudinal grooves 16 for accommodating the balls 4.

The device works as follows. .

When the thrust rod 2 is moved to the right by means of the rod 17 of the hydraulic cylinders of the unclamping, the package 13 of the spring was compressed. The finger 7, interacting with the longitudinal grooves 8 of the housing 12 and the screw portions 9 of the radial grooves of the lock, turns the latter to an angle at which the balls 4 are opposite the grooves 16 of the housing. Next, the finger moves in the longitudinal sections of the 10 grooves of the lock, and the ha 2, I interact with the mushroom protrusion 5 of the tailing mandrel 6, pushes the last of the conical spindle holes. In this case, the balls under the action of the mushroom protrusion are placed in the grooves 16. After changing the tool holder, the ram of the hydraulic cylinder 17 departs and pulls under the action of the packet of belleville springs to the left. At the same time, as a result of the interaction of the finger 7 with the slots of the lock and the body, their relative turn occurs, the balls emerge from the grooves, capture the mushroom-like protrusion of the mandrel 6 and pull it into the conical opening of the spindle. The threaded joint 15 provides a fixed clamping of the mandrel in the spindle with a force several times greater than the force developed by the package of disc springs, and also by performing a self-braking thread, eliminates the possibility of unclamping the mandrel in the spindle under the action of cutting forces.

Claims (1)

Claims. A device for fastening a tool in a machine spindle machine, comprising a spindle mounted in an axial bore, connected to a lock with balls installed in radial bores to interact with. a mushroom-shaped protrusion on the shank of the tool holder, and a packet of cup springs designed to transfer the force in the direction of the spindle tail, characterized in that, in order to increase the reliability of fastening, the lock is installed on the rod to be turned and axially moved, and the device provided with a finger fixed in a radial hole made in the radial hole with the possibility of interaction with the ends of the radial grooves made in the lock with screw and longitudinal sections and longitudinal grooves inserted Into the device of the case mounted on the lock with the possibility of relative rotation and axial movement, while the case is installed in the axial bore of the spindle between the packet of spherical springs and the internal end lug made in the spindle and connected to the lock by means of a threaded connection, the direction of which is opposite to the direction of the helix sections of grooves in the lock, with internal longitudinal grooves for accommodating balls in the housing. Fie.2