SU935160A1 - Apparatus for producing shells - Google Patents

Description

(4) DEVICE FOR THE PRODUCTION OF SHUTTERS

one

The invention relates to the processing of metals by pressure, specifically to devices for forming shells from sheet blanks, weakened by cuts.

 A device for the manufacture of shells is known, comprising a cylindrical mandrel mounted on a frame and two forming arms with drives. The device provides bending of single-slotted rings from solid blanks and their contact welding 1.

However, the known device does not provide for the manufacture of high-quality shells from sheet blanks, weakened by notches, since its lengths do not prevent the fracture of the shell in weak places in the initial bending period. In the future, this fracture can be eliminated by bending effort, which is much higher than usual. However, after the removal of the obtained shell from the mandrel, it changes its shape: significant shape distortions are observed up to fracture.

The aim of the invention is to improve the quality in the manufacture of shells with cutouts on the surface.

For this purpose, a device for making shells containing a cylindrical mandrel mounted on a frame and two forming levers with drives is provided with a semi-circular matrix that is movable from the drive with a centrally located groove and an internal diameter corresponding to the diameter of the mandrel, positioned above the matrix with the possibility of joint traverse with it with

p hydraulic shock absorbers, as well as stops mounted on the frame, limiting the movement of the traverse, while forming the levers with drives are pivotally mounted on the matrix.

FIG. 1 shows the device, a general view; in fig. 2 - device with the initial position of the forming levers and the matrix, end view; in fig. 3 - device with the closed state of the levers on the mandrel; end view; in fig. 4 - traver2Q sa, section on the stop; in fig. 5 - traverse With an emphasis, side view; in fig. 6 - shell reamer (blank).

Claims (1)

The device consists of a bed 1, on which a drive 2 is fixed, carrying the matrix 3 and pivotally forming levers 4 installed on it, their drives 5 and hydraulic shock absorbers 6. Traverse 7 is connected with hydraulic shock absorbers 6 and interacts with the stops 8, fixed on the bed 1. The matrix 3 has a longitudinal groove 9. The mandrel 10 is rigidly connected to the bed 1. On the yoke 7, there are stops And, the shanks 12 of which extend beyond the thickness of the yoke 7 and when mating the matrix 3 with the mandrel 10 interact with the sheet and Flat 13 mandrels 10. stroystvo operates as follows. The yoke 7 in the initial position (lower position) should be from the mandrel 10 at a distance equal to the sheet thickness and the size of the gap S. From the initial position, the matrix 3 by the actuator 2 rises up, choosing the gap S between the mandrel 10 and the product, which rests on the matrix 3 and the yoke 7. Once the gap S is selected, the yoke 7 and the hydraulic shock absorbers 6 start working, i.e., due to the resistance of the hydraulic shock absorbers, a force is created to press the sheet against the mandrel 10, which maintains the sheet during its further forming, the dies 3 with the lever 4 continues to move upwardly until mating semicircular array 3 to the mandrel 10, in this position, the yoke 7 includes a groove 9 and crosspiece 7 occupies the upper position, but its force is zero, and consequently, it does not separate the matrix from the mandrel. After the lower part of the shell is molded by the matrix 3, levers 4 come into operation, which finally form the profile of the shell, the cylinders 5 connected to the matrix 3 perform the lever rotation. When the matrix 3 interacts with the mandrel 10, the stop 11 enters the work which is pushed out of its socket by the matrix 3 by means of the shank 12 at its final position. After closing the levers 4, electric welding of the longitudinal groove of the shell is performed. During the return stroke, the forming arms 4 are opened, the die 3 is lowered, the crosshead 7 is reduced by the size of the gap S and the sheet thickness, is encountered with the stops 8 and stops, because the hydraulic shock absorber rod 6 is connected to the crosshead 7, their forces stop, and their cylinders associated with the matrix 3, down, bypassing the working fluid from the upper cavity to the lower. The proposed device for the manufacture of shells in comparison with the known device provides an increase in the quality of the formation of shells weakened by the notches by pre-pressing the weak points to the mandrel and ensuring reliable fixation of the workpiece during the molding process; reducing the effort to form the shell by preventing fractures in weak places, which does not follow the mechanism of the known device, and a force several times greater is needed to straighten the broken zones than to perform sheet bending; simplifying the design of the device by reducing electrical equipment to control and reduce the amount of control electricity as a result of replacing hydraulic cylinders with hydraulic shock absorbers. Claim device for producing shells, comprising a cylindrical mandrel mounted on a frame and two forming levers with drives, characterized in that, in order to improve quality in the manufacture of shells with cutouts on the surface, the device is provided with a semicircular matrix vertically under the drive with a semicircular matrix with a central groove and the internal diameter corresponding to the diameter of the mandrel placed above the matrix with the possibility of joint movement with the crosshead with hydraulic shock absorbers, as well as fixed on the frame stops that limit the movement of the traverse. at the same time the forming levers with drives are hinged on the die. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 411940, cl. B 21 D 7/02, 09/08/69 (prototype). F7 / Lxht eight IT