SU1488054A1 - Device for preparing pipe ends to drawing - Google Patents

Abstract

The invention relates to drawing and relates to a device for forming a gripper on pipes before drawing. The purpose of the invention is to increase the reliability of work. The device comprises a hydraulic cylinder 1, on the hollow stem 2 of which a fiber holder 3 with a die 4 is installed, having crimping 5 and calibrating 6 parts. In fiber hub 3, an abutment 7, arranged in the form of a slide, is axially displaced from the spring-loaded piston 8. The stop 7 carries a replaceable tip with a conical 9 section and a stepwise increasing cylindrical 10 section with a diameter equal to the diameter of the calibrating part of the die, and a length not less than the length of the calibrating part of the die. 3 il.

Description

5 9 10

3 .1 2

The invention relates to drawing, cue and relates to a device for forming a gripper on pipes before drawing,

The purpose of the invention is to increase the reliability of work,

Figure 1 shows the device in the initial position; Fig. 2 is the same in the process of forming the grab; on fig.Z the same at the end of work.

The device contains a hydroscherd

1 with a hollow rod 2 bearing a die-holder 3 with a die 4, having a crimping 5 and calibrating 6 parts. In the locate holder, there is a stop 7, made in the form of a slide, which has an axial movement drive in the form of a stem mounted in the cavity

2 spring-loaded piston 8. Fuse non-set of interchangeable tip, having a conical diver 9 and stepped cylindrical section

10 with a diameter equal to the diameter of the calibrating part 6 of the die 4, and dpina not less than the length of the calibrating part of the die.

The device works as follows;

The pipe 11 to be processed is fed into the device, centered and fixed along the axis of the die 4. The pressure in the working cavity 12 of the shields 2 of the hydraulic cylinder 1 is idled by the die 4 before it touches the pipe core and continues to form a hook. Together with the rod, the stop 7 with a changed tip makes movement towards the end of the pipe being processed. Upon further movement of the rod 2, the conic part 9 of the interchangeable tip enters the gripper until the stage of the cylindrical tip section is in contact with the gripper face. The stop stops, the volume of the working cavity 13 begins to decrease, and a part of the liquid is displaced from it into the drain with a small adjustable counterpressure, ensuring that the replaceable tip is pressed to the end of the gripper. The conical section of the interchangeable tip fixes the end of the gripper, preventing its bending, in the process of formation. The occurrence of deist

The interlocking force of the grab is perceived through the interchangeable tip and abutment guiding fiber carriers 3.

After forming the gripper on the pipe of the required length, the pressure is supplied to the working cavity 13; the working spaces 12 and 14 are interconnected as well as with the drain. The pressure in the cavity 13 of the replaceable tip is pressed against the end of the gripper, preventing its axial displacement, and the rod 2 begins to move in the opposite direction to remove the dies 4 from the gripper. The liquid from the working cavity 12 flows into the working cavity 14 and partially to the drain. At the end of the stroke of the rod 2 at the removal of the die 4, the latter advances with its calibrating part 6 onto the cylindrical portion 10 of the interchangeable tip, thereby freeing the gripper from the action of the die. After the working cavity 13 is connected to the spring by a spring, the conical section of the replaceable tip is taken out of the catch, the stop with the replaceable tip is set to the initial position, and the fiber holder is also moved to the initial position by applying pressure to the working cavity 14. Then the cycle repeats.

The use of the invention makes it possible to increase the reliability of the device and reduce the laboriousness of readjustment when switching to another size.

Claims (1)

Invention Formula A device for preparing the ends of pipes for drawing, containing its hydro, is a cylinder with a hollow brush carrying a die holder with a die, and an emphasis placed in the fiber holder with a drive for its axial movement in the form of a spring-loaded piston mounted in the cavity of the rod, that, in order to increase the reliability of operation, the emphasis is made in the form of a slide carrying a replaceable tip with a conical section and a stepped increasing cylindrical section with a diameter equal to the diameter of the gauge part of the die, and a length not less than field intensity gauge portion of the die. W /////; //. Fie.2 Fi.Z