DE1119207B - Device for the rotating insertion of round work pieces, e.g. Rods in the dies of drawbars - Google Patents

Description

, Unsharpened workpieces are usually pushed into drawing dies in such a way that that the rods or tubes are held in place with the aid of clamping devices by means of clamping jaws and are pressed through the die, the workpieces in a radial rest position in a straight line and along their Axis can be moved. The clamping elements used for this open and close in the longitudinal axis of the workpiece to be pushed in. The clamping elements are driven hydraulically or pneumatically, less often mechanical; in the latter case, the drive is usually removed from the pull chain.

This type of pushing in the workpieces has the disadvantage that the workpieces are always precisely centered must be pushed against the drawing die, otherwise the workpieces on one side opposite the edge sit on the die.

Another disadvantage is that the upsets and crimps in the material of the workpiece while entering the die, it is left to randomness and does not appear can evenly distribute the circumference of the workpiece. In addition, the hydraulic or pneumatically operated pusher devices for generating the hydraulics or pneumatics special expenses are necessary. Where the power of the pull chain required to push in is removed, two work operations - pushing in and pulling - are separated from each other made dependent, which couple poorly with each other because of their different timing permit.

There are also known drawing machines in which the drawing die while the workpiece is being pushed in is set in rotating motion. This ensures an even flow of material in the workpiece Facility that has a beneficial effect still has some shortcomings in its machine training. So the rotating drawing die z. B. a special storage and a special drive, and the pusher is a separate unit from the rotating drawing die, which is also controlled must become.

It is therefore the object of the invention to propose a push-in device with the clamping and The push-in process and the rotating movement between the workpiece and the die are combined as much as possible and do not require separate movement impulses.

According to the invention, in a device for rotating pushing in with one opposite the die axially displaceable clamping head and clamping jaws that surround the workpiece centrically proposed, Rotary push-in device

of round workpieces, e.g. B. Rods,

into the dies of draw benches

Applicant:

VEB Heavy Machinery "Heinrich Rau", Wildau (Kr. Königs Wusterhausen)

Kurt Fritsche, Blankenburg (Harz),
has been named as the inventor

that a clamping head is arranged in a stationary housing, which is coupled to it by a non-rotatable Worm gear of a worm gear mounted in the housing can be driven in rotation and here is axially displaceable by a transport thread and also in the circumferential direction of the clamping head has spirally rising clamping surfaces, which in turn carry out the radial adjustment of the rollers via rollers cause a kind of slip clutch from the housing from the clamping jaws that are hindered from rotating. Between the clamping jaws pushed in the opening direction by compression springs seated in recesses in the jaws fingers can intervene that are parallel to the clamping head axis and on one side against one Frictional resistance are rotatably attached to the housing mounted ring.

An exemplary embodiment of the invention is shown on the basis of the drawing.

Fig. 1 shows a section through the longitudinal axis,

FIG. 2 shows a section along the line AB, the arrow in FIG. 2 indicating the direction of rotation during tensioning.

In a fixed frame 1 connected to the foundation is a worm wheel 2, which by a Screw 3 is driven, rotatably mounted. A frame cover 4 forms the second side of the screw bearing. The bore of the worm wheel 2, which is larger in diameter than the neck of the housing 5, is provided with a driver 6. The driver opens this when the wheel rotates the housing 5 transferred. A socket-like part 7 of the frame 1 is provided with the thread, whereby the housing 5 executes a helical movement when the wheel 2 rotates. As a result of this

109 749/224

Rotation press the spiral-shaped clamping surfaces 8 onto rollers 10 attached to jaws 9. This initiates clamping of the jaws. A ring 11 stops at the beginning of the clamping process, i. H, up to the frictional connection between Bakken9 and workpiece 12, due to its frictional resistance on frame 1, the jaws in their relative position to the frame. After the positive connection has been made, the ring 11 is taken along. Actuate springs 13 When the housing 5 is rotated against the direction of the arrow in FIG. 2, the jaws 9 are opened.

IO

Claims (2)

PATENT CLAIMS: 1. Device for rotating pushing in of round workpieces, eg. B. rods, in the matrices of drawing benches, with a clamping head axially displaceable with respect to the matrix, which with its jaws centrally surrounds the workpiece, characterized in that a clamping head (5) is arranged in a stationary housing (1), which by the (6) worm wheel (2) of a worm drive (2, 3) mounted in the housing (1) rotatably coupled to it, can be driven in rotation and can be axially displaced by means of a transport thread and which also has spiraling clamping surfaces (8) in the circumferential direction of the clamping head (5) which, via rollers (10), cause the radial adjustment of the clamping jaws (9), which in turn are prevented from rotating by a type of slip clutch (11) from the housing (1). 2. Apparatus according to claim 1, characterized in that between the through in recesses the jaws (9) seated compression springs (13) in the opening direction urged clamping jaws (9) Fingers intervene that are parallel to the clamping head axis and on one side against one Frictional resistance rotatable on the housing (1) mounted ring (11) are attached. Considered publications:
French patent specification No. 335 116. 1 sheet of drawings © 109 749/224 12.61