SU899193A1 - Apparatus for forming grip zone on tubes before drawing - Google Patents

Description

(54) DEVICE FORMATION OF TAPE ON PIPES BEFORE DRAWING

one

FIELD: dragging.

The closest in technical essence to the invention is a device comprising a hydraulic cylinder with a hollow brush, on which a fiber hanger with a fiber is mounted, and a hydraulic system for controlling a hydraulic cylinder 1.

A disadvantage of the known device is that during the removal of the pressed dies by the movement of the fiber holders the retaining elements cause damage to the pipe surface.

The purpose of the invention is to increase the quality of the tube stock, as well as to expand the capabilities of the device when processing pipes with different wall thickness.

The goal is achieved by the fact that the device for forming a hook on the pipes before drawing, including a hydraulic cylinder with a hollow rod, on which a fiber holder with a wire and a hydraulic system are installed, is equipped with a stop with a piston arranged to move in the hollow rod of the hydraulic cylinder; formed by the internal cavity of the rod and the piston of the movable stop is connected to the hydraulic control system. In addition, the movable stop is made spring-loaded.

FIG. 1 shows the device, a general view; in fig. 2 - fiber holder with hydraulic cylinder, longitudinal section, and hydraulic system diagram.

The device contains a fixed stop 1, clamps 2, a hydraulic cylinder 3, on the hollow stem 4 of which fiber carrier 5 is installed, and a hydraulic system 6. In the hollow stem 4

10 of the hydraulic cylinders 3, an emphasis 7 is mounted with a piston 8 and a spring 9. The piston 8 is located in the hollow of the cylinder 4 of the hydraulic cylinder 3. In the fiber holder 5 there is a die 10 and a guide bushing 11. On the casing 12

15 of the hydraulic cylinders 3 fixedly mounted a rod 13 connecting the chamber 14 formed by the internal cavity of the rod 4 and the piston 8 with the distributor 15 controlled by an electromagnet 16. The piston cavity 17 and the rod cavity 18 of the hydraulic cylinder 3 are dinene with the distributor 19 controlled by electromagnets 20 and 21 Distributors 15 and 19 are also connected to supply 22 of a pressure source (not shown), and hydraulic resistance is installed at the discharge.

23, creating a support required when operating the device.

The device works as follows.

The billet 24 is fed into the device and centered along the axis by the clips 2. The electromagnet 21 is turned on, the distributor 19 connects the piston cavity 17 of the hydraulic cylinder 3 with the pressure supply 22, and the piston cavity

18- with drain. The rod 4 of the hydraulic cylinder 3 makes an idling until the portage 10 comes into contact with the workpiece 24, and starts pressing. Upon further movement of the rod 4, the stop 7 comes into contact with the end face of the workpiece 24 and stops, the volume of the chamber 14 decreases and a part of the liquid from it 13 through the distributor 15 is forced out to drain.

After the gripper has been formed on the workpiece 24 of the required length, the electromagnet 21 is turned off, the distributor 19 is set to the neutral position, connecting the piston cavity 17 and the rod cavity 18 to each other, as well as through the hydraulic resistance 23 to a drain. To remove the dies 10, pressed onto the workpiece 24, an electromagnet 16 is turned on. A distributor 15 connects the chamber 14 to the pressure supply 22. With this pressure, the movable stop 7 presses against the end of the workpiece 24, preventing its axial displacement and the rod 4 of the hydraulic cylinder 3 starts the removal movement of the pressed die 10. Since the removal force of the die BEFORE closes at the end of the workpiece 24, it does not axially displace. At the same time, the brush 4, when moving, displaces fluid from the piston cavity 17 through the distributor

19 to drain. The backwater created by the hydraulic resistance 23 on the discharge ensures the filling of the released volume of the rod end 18.

After completing the full stroke by the piston 8, the electromagnet 16 is turned off, the electromagnet 20 is switched on and the pressure supplied to the rod end 18 is removed, the stem 4 with the fiber holder 5 is retracted

the position, after which the electromagnet 20 is turned off, the latches 2 release the workpiece 24.

By the spring 9, the stop 7 with the piston 8 is retracted to its original position, and a part of the liquid is forced out of the chamber 14 to drain. Retraction

7 is necessary to prevent it from getting inside the workpiece 24 with thin-walled pipes and large cuts when the outer diameter of the pickup is less than the internal diameter of the workpiece 24 before it is crimped. The process then repeats.

Claims (2)

1. A device for forming a gripper on pipes before drawing, including a hydraulic cylinder with a hollow rod, on which a fiber holder with a wire is mounted, and a hydraulic system for controlling a hydraulic cylinder, characterized in that, in order to improve the quality of the billet, the device is equipped with an abutment with a piston that can be moved in the hollow rod of the hydraulic cylinder, and the chamber formed by the internal cavity of the rod and the piston of the movable stop is connected to the hydraulic control system. 2. The device according to claim 1, characterized in that, in order to expand the capabilities of the device when processing pipes with different wall thickness, the emphasis is made spring-loaded. Sources of information taken into account during the examination 1. Calibration and pipe-wrap mills. Catalog-directory K2-70 NIIINFORMTYAJMASH. M., 1970, l. No. 15 yy Fi..2