SU1456274A1 - Apparatus for making tubes by applying fluid pressure - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to devices for hydraulic pressing of hollow tubular shaped articles. The purpose of the invention is to increase productivity due to the possibility of simultaneously feeding the workpiece and the mandrel into the working chamber of the container and increasing reliability by simplifying the design and reducing the number of high-pressure seals. Before loading, the mandrel is inserted into the container from the exit cone of the die. At the same time, on the other side of the container, the workpiece is placed, and a cork is placed on the workpiece. During hydraulic pressing, the pressed part of the product carries along the mandrel. At the end of the process, the cylindrical tube body abuts the matrix. The piston of the test tube presses the press residue beyond the limits of the calibrating ska, the mandrel is removed from the product, which is then abutted with the end into the gate. Placing the drive for longitudinal displacement of the mandrel on the output cone side of the die allows the plunger to be manufactured without a central bore and additional high pressure sealing. 1 il. (/) WITH

Description

The invention relates to the processing of metals by pressure, and more specifically to devices for hydraulic pressing of hollow tubular shaped articles.

The purpose of the invention is to increase productivity by simultaneously supplying the workpiece and the mandrel to the working chamber of the container and improving reliability by simplifying the design and reducing the number of -. High pressure seals.

The drawing on the left shows the initial position of the parts of the device before the start of pressing, and on the right - in

the end of the pressing process before extracting the mandrel from the product.

The device consists of a container 1 installed at the exit of the working chamber of the container of the matrix 2 and the plunger 3. At the base 4 on the side of the output cone of the matrix 2 a longitudinal movement actuator is placed in the form of a power cylinder 5, on the rod of which can be inserted into the working chamber through a point the die is installed mandrel b, as well as the gate 7 for removing the product 8 from the mandrel. A cork is installed on the workpiece 9, consisting of a cylindrical body 10 and

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a piston 11 with a rod having a recess in the end for accommodating an end portion of the mandrel.

The device works as follows.

Through the cylinder 5, placed in the base 4, the mandrel 6 is introduced into the container 1 from the exit cone of the die 2. At the same time, the workpiece 9 is placed on the other side of the container, and the working fluid is poured onto the workpiece and pressure is raised by the movement of the plunger 3 matrix, and the pressed part of the product 8 carries the mandrel. At the end of the pressing, the cylindrical body 10 rests on the matrix 2 and the compressed fluid drives the piston 11 and presses the press residue beyond the limits of the calibration matrix. The plunger 3 is retracted to its initial position, and the mandrel is removed from the product by means of the cylinder 5, which is then abutted with the front end into the gate 7. The process is completed.

Example. The pipe was pressed from steel with a carbon content of 0.5%, hardened to a hardness of HRC 30. Workpiece dimensions: outer diameter 18.5 mm; internal 10.2 mm; 80mm length The size of the mandrel, diameter 9.4 mm; length is 100 mm. The mandrel with its threaded part is attached to the ejector press mod. DB2432, By means of a pusher, a mandrel was inserted into the container cavity from the output cone of the die. At the same time, on the other hand, a blank was placed in the container. The fluid was poured and the plunger was simultaneously lowered along with

But the compressed fluid set the piston in motion and pressed the balance beyond the matrix that calibrated it. The plunger was withdrawn together with the stopper to the initial position, and the product pressed onto the mandrel was pressed against the gate end with the front end and the mandrel was removed with a pusher extruder.

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The use of the present invention will improve the performance of the press by combining the methods of insertion of the mandrel and installation

15 in the cavity of the container, simplify the design of the device by installing a drive for longitudinal movement of the mandrel on the output cone of the die, and also increase the reliability of operation of the device due to the decrease in the number of high pressure seals and ease of operation.

Claims (1)

25 claims A device for hydraulic pressing of pipes, comprising a base, a container with a container placed at the outlet thereof. 30 a working chamber with a matrix; , in order to increase production capacity due to the possibility of simultaneous supply of the workpiece and mandrel to the working chamber of the container and increase of reliability due to simplified design and reduction of wheel sizes. ilJl J Ji lti -.l - V, ..-. -one With a stopper consisting of two parts. 45 of the number of high-pressure seals. The stopper sealed the internal flow, driving the longitudinal movement of the workpiece, then raised the fluid pressure to 600 MPa. At this pressure, the workpiece was squeezed out through the matrix point, and the pressed part of it 50 carried the mandrel along. At the end of the pressing, the cylindrical casing of the cork rested against the end of the mattress was placed under the base aligned with the matrix; and in the end of the piston rod of the plug there is a recess for accommodating the end portion of the mandrel. But the compressed fluid set the piston in motion and pressed the balance beyond the matrix that calibrated it. The plunger was withdrawn together with the plug to the initial position, and the product pressed onto the mandrel was pressed against the gate end with the front end and the mandrel was removed with a press ejector. The use of the present invention will improve the performance of the press by combining the methods of insertion of the mandrel and installation 5, simplify the design of the device by installing a drive for longitudinal movement of the mandrel on the output cone of the die, and also increase the reliability of the device operation due to the reduced number of high pressure seals and ease of operation. 5 claims A device for hydraulic pressing of pipes, comprising a base, a container with a container placed at the outlet thereof. 0 a working chamber with a matrix, a tube installed in a container, consisting of a cylindrical body and a piston with a rod placed in a cylindrical body, a mandrel driven by longitudinal movement in the form of a power cylinder and a movable plunger, and a spindle placed at the output of the die, characterized in that , in order to increase productivity due to the possibility of simultaneous supply of the workpiece and mandrel to the working chamber of the container and increase reliability by simplifying the design and reducing the number high-pressure seals, longitudinal movement drive the mandrel is placed under the base in alignment with the die, the mandrel is installed with the possibility of inserting it into the working chamber of the container through the matrix point, and in the end of the piston rod of the plug there is a recess for accommodating the end portion of the mandrel.