SU440179A1 - Device for shaping parts from tubular blanks - Google Patents

Description

one

The invention relates to the processing of metals by pressure, in particular, to devices for the manufacture of hollow parts with branches from tubular blanks, for example tees.

Devices for manufacturing such parts are known, comprising a frame on which hydraulic axial compression cylinders with rods equipped with punches, a multiplier, a table with a lower half matrix and a cross bar mounted on it are mounted.

However, the known devices have large dimensions due to the location of the multiplier inside one of the axial compressors, their plungers, as well as a longer cycle time due to the pause between the moments of contact between the axial compression punches and the ends of the workpiece and the start of the molding, since air must be removed and filled the cavity of the workpiece liquid.

In order to increase productivity and reduce dimensions, the device is equipped with a movable carriage rigidly connected to the rod of one of the axial compression cylinders, and in which a channel is provided for supplying fluid to the workpiece cavity, while the multiplier is fixed on the movable carriage and the punches are provided with mobile punches, bushings.

FIG. 1 shows a longitudinal section of the device; in fig. 2 - top view of the installation

with sn that upper traverse.

The device has a horizontal frame 1, on which axial compression cylinders 2 and 3 are fastened. A carriage 4 is rigidly attached to the rod of cylinder 2, on which a multiplier 5 is mounted, which creates a high pressure in shaping the internal cavity of the workpiece 6.

Axial compression punches 7 and 8 are attached to the carriage 4 and the cylinder rod 3, equipped with movable limiting sleeves 9 and 10, which allow the fluid to flow into the internal cavity of the workpiece prior to contact with its axial compression punches. The fluid is supplied by the autonomous hydraulic system 11 through the check valve 12 mounted on the carriage 4 through the carriage channel and the sleep 7. The synchronization of the movement of the axial compression punches is provided by the hydraulic synchronizer 13.

The device is equipped with a table 14, on which the lower semi-matrix 15 is installed. The upper semi-matrix 16 is fixed on the movable cross-member 17. On the table of the device, cylinders 18 and

19, to the pins of which the punch of the sub-pressure 20 and 20 are fastened. The number and location of the supporting cylinders is determined by the configuration of the molding part. The upper half-matrix 16 is moved and held in a closed position by the cylinder of the clamp 22, the casing of which is attached to the table of the device, and the rod carries the traverse 23 through the column 24 connected to the upper traverse 17.

The device works as follows.

Pipe billet 6 is placed in the lower semi-matrix 15. The upper semi-matrix 16 is lowered until it touches the lower and clamped by the force of the cylinder 22. At the same time, the cylinders of the overpressure 18 and 19 are actuated, the feed of the punches of the overpressure 20 and 21 into the working position — up to the stop of their collar into the matrix.

The axial compression punches 7 and 8 move towards each other synchronously, and simultaneously with the movement start of the punches, the flow of liquid through the left punch 7 into the tubular blank cavity is turned on. The movable limiting sleeves 9 and 10, abutting against the ends of the semi-matrices, form a closed volume, which ensures the filling of the internal cavity of the workpiece and the removal of air through the gap before the ends of the punches touch the ends of the workpiece. The excess fluid flows out through the special holes and returns by gravity to the hydraulic system tank 11. In the position where the gap between the ends of the punches 7 and 8 and the workpiece becomes 3 to 5 mm, the multiplier 6 is turned on, the liquid from which also begins to flow into the cavity of the workpiece. After the ends of the punches touch the ends of the blank 6, the blank is sealed and the pressure of the fluid in its cavity rises to a predetermined value. The hydraulic system 11 is automatically shut off by the check valve 12. At the same time, the speed of movement of the plungers 7 and 8 is slowed down to prevent the workpiece from losing stability until the required working pressure is obtained in its cavity. With further approximation of the axial compression punches, the tubular billet is precipitated in length and the metals are displaced into the bends.

Punches backwater 20 and 21 under the action

formed taps retracted, and

multiplier 5 maintains a constant

specified pressure in the cavity of the workpiece.

With the passage of axial punches

squeezing 7 and 8 of the given path stops them, simultaneously the punches of the back pressure 20 and 21 stop, and the piston of the multiplier 5 returns to its initial lower position. The pressure in the cavity of the workpiece is reduced. When the piston reaches the lower position multiplier, the axial compression punches are retracted to the initial position and the upper half matrix 16 is lifted simultaneously with the withdrawals of the back pressure punch 20 and 21. When the upper semi-matrix reaches the initial position, the working cycle ends.

Subject invention

A device for shaping parts from tubular blanks comprising a frame,

on which are installed hydraulic cylinders for axial compression of the workpiece with rods equipped with punches, a multiplier, a table with a lower semi-matrix located on it and a traverse with a fixed on

It has an upper half matrix, characterized in that, in order to increase productivity and reduce the dimensions of the device, it is equipped with a movable carriage rigidly connected to the rod of one of the axial compression cylinders and in which a channel is supplied to supply the liquid into the cavity of the workpiece, while the multiplier is fixed to movable carriage, and the punches are equipped with a movable relative to the punches, sleeves covering them.