RU79260U1 - DEVICE FOR MANUFACTURING STEEP-BENT PIPES - Google Patents

Abstract

The utility model relates to the field of metal forming and can be used for the manufacture of steeply curved nozzles. The technical result of the proposed utility model is: - improving the manufacturing quality of steeply curved nozzles; - increasing the productivity of the device for manufacturing steeply curving nozzles. In a device for manufacturing steeply curved nozzles containing a matrix with a curved channel, the mechanism of pushing into the matrix of the tube stock, according to the utility model, to the matrix before a die is connected by its curved channel, the hole in which is made with a diameter smaller than the outer diameter of the tube stock , as a mechanism for pushing into the matrix of the tubular billet, a hydraulic press is used, the rod of which is hollow, and at the end of which, facing the matrix, a collet is fixed.

Description

The utility model relates to the field of metal forming and can be used for the manufacture of steeply curved nozzles.

A device for the manufacture of curved nozzles according to patent RU 2062158.

The device comprises a bed in the form of fixed traverses connected by horizontal columns, a rod bearing a horn-shaped core, and a movable traverse with a cylindrical protrusion. This protrusion is made with an inner diameter equal to the diameter of the deformable pipe, and a height equal to half the ratio of the outer diameter of the workpiece to the thickness of its wall. The cylindrical protrusion covers the end part of the pipe to be bent. The movable traverse moves due to the impact of the hydraulic cylinder rods on it.

In the process of shaping, the tube blank is pushed along the horn-shaped core. The cylindrical protrusion on the movable traverse provides pinching of the end part of the workpiece, which eliminates the loss of stability of the wall of the pipe workpiece in the zone of transmission of the working force and with a relatively thick wall of the workpiece along the entire length of the workpiece.

However, with a small wall thickness of the tubular billet, its stability may be lost in the area not covered by the cylindrical protrusion. This is a disadvantage of the known device. In addition, the known device has a low productivity of manufacturing steeply curved nozzles, since it requires preliminary cutting of the pipe into blanks of the required size, heating it in a furnace to a pace. 700-900

degrees, machining of the end face after deformation by a mechanical method, which is explained by the need for individual installation of each workpiece in technological equipment.

A device for bending pipes, including steeply bent pipes, is known according to patent RU 2016683, selected by the applicant as a prototype.

The known device contains a pusher, a matrix, a rotary roller. The matrix is made in the form of two half-matrices, respectively, with rectilinear and curvilinear channels. In the profile channel of the roller, a mandrel-limiter is installed for fixing the workpiece along the inner generatrix of the bend. The axis of the curved channel is offset relative to the axis of the rectilinear channel. The roller is mounted with the formation together with the semi-matrix having a straight channel, a transition zone, the axis of which is located at an angle to the axes of the channels of the semi-matrices.

The manufacture of a bent pipe is carried out by pushing the tube stock through a curved matrix by means of a rotary roller. In front of the bending zone, a part of the workpiece is displaced in the direction from the center of the bend by a shift while fixing the end of the workpiece along the inner generatrix of the bend.

This design of the device allows to avoid during the bending of the workpiece loss of its stability and the formation of corrugations in the zone of the smallest bending radius.

However, in the zone of the largest bending radius due to the sliding friction forces of the workpiece along the matrix channel in the metal of the thin-walled tube billet, stresses exceeding the maximum stresses can occur, which can cause ruptures in the pipe wall. This is a disadvantage of the prototype.

In addition, the prototype has a low productivity of manufacturing steeply curved nozzles due to the need for individual installation of each workpiece in technological equipment.

The technical result of the proposed utility model is to eliminate the disadvantages of the prototype, namely:

- improving the quality of manufacture of steeply curved nozzles;

- improving the performance of the device for the manufacture of curved nozzles.

The technical result is achieved by the fact that in the device for manufacturing steeply curved nozzles containing a matrix with a curved channel, the mechanism of pushing into the matrix of the tube stock, according to the utility model, a die is connected to the matrix in front of its curved channel, the hole in which is made with a diameter smaller than the outer diameter of the tube billet, as a mechanism for pushing into the matrix of the tubular billet, a hydraulic press is used, the rod of which is hollow, and at the end of which, facing the matrix, is fixed n collet grip.

In addition, the device for the manufacture of steeply curved nozzles is equipped with a mechanism for cutting off the finished parts, a hydraulic drive of the hydraulic press, and automation.

Attaching a die to the matrix in front of its curvilinear channel, the hole of which is made with a diameter smaller than the outer diameter of the tube stock, provides crimping of the latter when pushing it through the die, resulting in a distorted geometric shape of the crystal lattice of the workpiece metal, which causes an increase in the ductility of the workpiece metal. In addition, the outer surface of the pipe becomes smoother. Both of these circumstances provide a significant reduction in the force required for the deformation of the tube stock, as a result of which its stability is maintained during bending, and the possibility of rupture of the tube wall is eliminated.

the formation of corrugation on it, which completely excludes the output of defective parts.

The use as a mechanism of pushing into the matrix of a tubular billet of a hydraulic press, the rod of which is hollow, and at the end of which, facing the matrix, a grip is installed, provides, in comparison with analogs, an increase in the productivity of manufacturing steeply curved nozzles due to the fact that the hollow rod of the hydraulic press a long tube billet is loaded, which, with the help of a collet gripper and the working stroke of the hydraulic press rod, is cyclically pushed into the matrix until the billet is completely consumed and allows loading s next pipe without stopping the process. The proposed device for the manufacture of steeply bent pipes processes a long pipe without preliminary cutting into a workpiece, and the presence of a mechanism for cutting off finished parts precludes subsequent mechanical processing of the end face.

At the same time, the cyclical operation of the device is ensured by automation, which controls the operation of the hydraulic system, collet gripper and the mechanism for cutting off the finished parts.

The essence of the proposed utility model is illustrated in the figure, which shows a schematic diagram of a device for the manufacture of bent pipes. At the same time, the diagrams are not conventionally shown or indicated: hydraulic system, collet gripper drive, automation.

The proposed device contains a removable matrix 1, to which in front of its curvilinear channel 2 is attached a replaceable die 3, which is a metal bar or cylinder with a central calibrated hole with two-way inlet chamfers. The matrix 1 is attached using a detachable connection to the glass 4, which is also detachably attached to the hydraulic press 5 of the push mechanism into the matrix of the tube billet. The stem 6 of the hydraulic press 5 is made hollow. At the end of the rod 6, facing the matrix 1 is fixed

interchangeable collet grip 7. Hydraulic lines (not shown) of oil supply from the hydraulic system are connected to the working cavities of the hydraulic press 5. The device is equipped with a mechanism 8, designed for cutting finished products.

The applicant has designed and manufactured an experimental device for the manufacture of steeply bent bends, which serve to connect sections of water and gas pipes with a nominal diameter of D _y = 15, 20, and 25 mm.

The manufacture of curved bends was carried out in the following sequence.

A matrix 1 with a curved channel 2, the diameter of which corresponded to the diameter of the deformable pipe, was connected to the glass 4 of the hydraulic press 5. Preliminarily, a die 3 was attached to the matrix 1 with a hole diameter smaller than the outer diameter of the pipe billet by 0.1-0.7 mm, and a collet 7 was fixed on the rod 6, the hole diameter in which corresponded to the outer diameter of the deformed pipe. In the hollow rod 6 of the hydraulic press 5, a long tube billet 9 was loaded until its end face into the entry chamfer of the calibrated hole of the die 3. After turning on the device, its automation ensured that the tube billet was gripped by a collet 7, the stroke of the rod 6 was pushed through the calibrated hole of the die 3 and a curved channel of the matrix 1, expanding the collet gripper 7 and returning the hollow rod 6 to its original position, a piece of the finished product 10 by mechanism 8.

After pieces of the finished product 10, the above cycle was repeated until the long tube stock 9 was fully used.

The work of the experimental device ensured the proper quality of manufacturing of bent bends and, in comparison with analogues, high productivity of their manufacture.

Claims (2)

1. A device for manufacturing steeply curved nozzles containing a matrix with a curved channel, a push mechanism into the matrix of the tube stock, characterized in that a die is connected to the matrix in front of its curved channel, the hole in which is made with a diameter smaller than the outer diameter of the tube stock, as a mechanism pushing into the matrix of the tubular billet used hydraulic press, the rod of which is hollow and at the end of which, facing the matrix, a collet is fixed. 2. A device for manufacturing steeply curved nozzles according to claim 1, characterized in that it is equipped with a mechanism for cutting off the finished parts, a hydraulic system for a hydraulic press drive, and automation.