CZ308544B6 - Turret locking and strengthening mechanism - Google Patents

Abstract

A machine tool turret locking and strengthening mechanism comprising a fixed portion with a base body (1), a roting portion with a support body (2), the outer surface of which is adapted to receive tool holders, and a rotating part drive mechanism. The locking and reinforcing mechanism forms a central block (3) which is firmly connected to the base body (1) of the fixed part and in which at least two radial reinforcing pistons (4) are located, the piston rods of which have a shaped reinforcing surface (6) arranged against the shaped reinforcing surface (7) of a circumferential recess (8) in the inner surface of the support body (2) of the rotating part, and at least two axial lifting pistons (5), the piston rods of which are fixed to the ring (9) the support body (2) of the rotating part, the base body (1) of the fixed part and the support body (2) of the rotating part have on the faces arranged with respect to each other locking surfaces (12, 13).

Description

Turret locking and strengthening mechanism

Field of technology

The invention relates to a turret locking and strengthening mechanism comprising a fixed part with a base body, a rotating part with a support body, the outer surface of which is adapted to receive tool holder holders, and a drive part of the rotating part.

Prior art

Currently, tools are changed and moved to the working position in several ways. One clamping interface can be used and the tools are fed by the manipulator or are picked up directly from the tool magazine. Another, very common variant is the use of a turret equipped with several tools. The tool is moved to the working position by turning this head. Recently, a design with three hirt couplings operated hydraulically or electromechanically and a servo drive for rotary movement is most often used to rotate and strengthen the turret in the desired position. The principle of the three couplings with hirt gearing consists in the fact that two couplings, one firmly connected to the fixed part of the turret and the other connected to the rotating part of the turret, have mutually adjoining gears and the mating piece of the coupling is inserted into them. Thus, the two parts of the turret, fixed and rotatable, are connected to each other. The disadvantage of this connection is that it is not possible to create a preload in the connection of the hirt coupling. This reduces the rigidity of the turret during machining, especially when the machining force acts against the direction of the third, reinforcing part of the hirt coupling.

The essence of the invention

The above-mentioned drawbacks are largely eliminated by the turret locking and strengthening mechanism, which comprises a fixed part with a base body, a rotating part with a support body, the outer surface of which is adapted to accommodate tool holder holders, and a rotating part driving mechanism in an embodiment according to the invention. The essence of which consists in that the locking and reinforcing mechanism is formed by a central block which is firmly connected to the basic body of the fixed part and in which at least two radial reinforcing pistons are located, the piston rods of which are provided with a shaped reinforcing surface arranged against the shaped reinforcing surface of the circumferential part. a recess formed in the inner surface of the rotating body support body, and at least two axial lifting pistons, the piston rods of which are rigidly connected to a ring on which the rotating part support body is rotatably mounted, the fixed body base body and the rotating part support body being provided on the faces. arranged against each other by securing ones areas.

It is advantageous if the shaped reinforcing surface of the circumferential recess of the support body of the rotating part and the shaped reinforcing surfaces of the piston rods of the radial reinforcing rollers are chamfered.

In a preferred embodiment, the central block is hollow and an actuator of the drive mechanism of its rotating part is arranged in its cavity in the axis of rotation of the turret.

The reinforced connection of the rotating part to the fixed part of the turret is provided by piston rods of radial reinforcing pistons firmly connected by means of a central block to the fixed part of the turret, which, when extended, engage with their bevel into the corresponding bevel of the inner circumferential recess of the turret support body. This mechanism acts as a locking clutch and creates a mechanical-hydraulic lock significantly increasing the clamping force and multiplying the force against loosening the turret. This ensures sufficient rigidity of the turret during machining. The mutual positioning of the fixed part and the rotating part by means of this connection ensures precise orientation and repeatability of the position during rotation.

- 1 CZ 308544 B6

Explanation of drawings

The locking and fastening mechanism of the turret according to the invention is schematically shown in the accompanying drawings, where in Fig. 1 this mechanism is shown in longitudinal axial section in a plane guided by radial clamping pistons and in Fig. 2 this mechanism is also shown in longitudinal axial section in a plane guided by axial lifting pistons.

Examples of embodiments of the invention

The locking and strengthening mechanism of the turret, which comprises a fixed part with the base body 1, a rotating part with the support body 2, the outer surface of which is adapted to accommodate tool holder holders, and a drive mechanism of the rotating part, consists of a central block 3 which is fixedly connected. with the base body 1 of the fixed part of the turret and in which are placed six hydraulic radial stiffening pistons 4 and three hydraulic axial lifting pistons 5. The piston rods of the radial stiffening pistons 4 are provided at the ends with a chamfered stiffening surface 6 arranged against the chamfered stiffening surface 7 of the circumferential recess 8. formed in the inner surface of the support body 2 of the rotating part. The radial strengthening pistons 4 serve to clamp and strengthen the rotating part of the turret relative to its fixed part. The piston rods of the axial lifting pistons 5 are firmly connected to a ring 9, on which the support body 2 of the rotating part is rotatably mounted. When rotating the rotating part of the turret, the ring 9 and the support body 2 thus act as an axial plain bearing. The axial lifting pistons 5 serve to push the support body 2 of the rotating part out of connection with the fixed part 1 and to push it back into this connection. The rotary movement of the rotating part 2 of the turret is ensured by an actuator 10 which is arranged in the cavity of the central block 3 in the axis of rotation of the support body 2 of the rotating part and which is connected to the support body 2 of the rotating part of the turret via a gear 11. The base body 1 of the fixed part of the turret and the support body 2 of the rotating part of the turret are provided on the faces arranged relative to each other with securing surfaces 12, 13 which serve to secure the position of the rotatable part of the turret relative to its fixed part.

The cycle of rotation and subsequent securing and strengthening of the turret proceeds as follows. Six radial reinforcing pistons 4, mounted in a central block 3 firmly connected to the base body 1 of the fixed part, are hydraulically inserted. Then, the three axial lifting pistons 5 slide the support body 2 with the machining tools out of the connection of the chamfered reinforcing surfaces 6, 7. The actuator 10 rotates the support body 2 of the rotating part of the turret to the selected position for the intended machining tool. Subsequently, the three axial lifting pistons 5 slide the support body 2 so that their locking surface 13 rests on the locking surface 12 of the base body 1 of the fixed part. Then the piston rods of the radial stiffening pistons 4 are extended so that they engage with their bevelled stiffening surfaces 6 in the chamfered stiffening surface 7 of the inner circumferential recess 8 of the support body 2, by means of which an axial clamping force This completes the cycle and can be followed by machining with the specified machining tool.

Industrial applicability

The locking and strengthening mechanism of the turret according to the invention is intended in particular for turrets of high-performance turning machines, on which high requirements are placed on high rigidity and transmission of large machining forces.

Claims (3)

PATENT CLAIMS A turret locking and strengthening mechanism comprising a fixed part with a base body (1), a rotatable part with a support body (2), the outer surface of which is adapted to receive tool holder holders, and a drive part of the rotating part, characterized in that that it consists of a central block (3) which is firmly connected to the base body (1) of the fixed part and in which at least two radial reinforcing pistons (4) are located, the piston rods of which are provided with a shaped reinforcing surface (6) arranged opposite the shaped a reinforcing surface (7) of a circumferential recess (8) formed in the inner surface of the support body (2) of the rotatable part, and at least two axial lifting pistons (5), the piston rods of which are rigidly connected to a ring (9) the body (2) of the rotating part, the base body (1) of the fixed part and the supporting body (2) of the rotating part being provided on the faces arranged with each other by securing surfaces (12, 13). Locking and reinforcing mechanism according to claim 1, characterized in that the shaped reinforcing surface (7) of the circumferential recess (8) of the support body (2) of the rotating part and the shaped reinforcing surface (6) of the piston rods of the radial reinforcing pistons (4) are chamfered. Locking and reinforcing mechanism according to claim 1, characterized in that the central block (3) is hollow and in its cavity a servo drive (10) of the drive mechanism of its rotating part is arranged in the turret rotation axis.