SU804079A1 - Machine for bending cylindrical articles - Google Patents

Description

(54) MACHINE FOR BENDING CYLINDRICAL PRODUCTS

one

The invention relates to the processing of metals by pressure, in particular, to bending devices around stationary shaped elements and can be used in the engine-building and bearing industry, where it is necessary to manufacture rings of small diameter.

A device for bending shells and pipes is known, the mandrel mounted on the frame and the bending elements located on either side of it, moving from the power cylinder along the guides of the bending heads or carriages. The device also contains a mechanism for feeding, fixing, bending the ends of the blanks and removing it 1.

The disadvantage of this device is the low quality of bent blanks, especially from materials with high springing. During the upward movement of the bending heads relative to the mandrel, the force of the pressing of the bending elements — the sliders — changes all the time, with the result that the curvature is uneven along the contour of the workpiece and the latter adheres to the mandrel. The bending is performed in a cold state and the workpiece is strongly resilient after unloading, as a result of which, even after bending the ends of a closed loop, it cannot be obtained.

The purpose of the invention is to improve the quality of products by reducing the springback.

For this purpose, the bending heads are provided with a drive for their rotation relative to the axis coinciding with the axis of the mandrel, made in the form of a power cylinder, connected by a gear system with a gear sector rigidly mounted on the bending head, and the bending elements, made in the form of rollers, are rigidly connected with driven by their translational movement.

FIG. 1 schematically shows a machine, front view; in fig. 2 - the same, top view; in fig. 3 shows section A-A in FIG. one; in fig. 4-6 sequence of movement of the bending elements when bending the workpiece in the ring.

Claims (1)

The bending machine for rings consists of a bed 1, bending heads 3 and a replaceable mandrel 4, a feed mechanism 5, a power cylinder 6 for driving bending heads, a mechanism for pressing workpieces, an end bending mechanism, a mechanism for removing bent rings, devices 7 for heating the blanks at the front of the flexible, folding stop 8 and the tray 9 for removing the bent rings. Frame 1 is a welded frame, the four vertical walls of which in the upper and lower parts are connected by welded boxes. The walls have horizontal bores for mounting the axles 2, on which the bending heads 3 are rotatably mounted. The heads 3 are rotated from the power cylinder 6 by means of the toothed rack 10 and intermediate gears 11 connected to the toothed sectors 12 fixed on the bending heads 3 Bending heads 3 provide movement of bending elements made in the form of rollers 13 around the axis of the interchangeable mandrel 4. The designs of both bending heads are similar. Inside the body of the bending head there is a hydraulic cylinder 14 of the translational movement of the slide 15, in the springs of which the roller 13 is fixed relative to the slide but rotatably. The work feed mechanism 5 has a table 16 on which the workpiece 17 is mounted. By sequential movement along the horizontal guides of the table 16 and the stop 18 from the hydraulic motor 19, the workpiece is moved to the bend zone. Table 16 has the ability to be manually adjustable in height by handwheel 20, depending on the diameter of the mandrel 4. On the surface of the table there are guide rails 21, adjustable depending on the width of the workpiece. The clamping mechanism is a hydraulic cylinder 22 with a special nozzle 23 on the brush and is mounted in the bottom box of the bed 1. A hydraulic cylinder 24 with a replaceable nozzle 25 on the brush is installed in the upper box of the bed to bend the ends. The mechanism for removing bent rings is a quill 26 mounted in one of the axes of rotation of the bending heads, to which the interchangeable mandrel 4 is attached. The quill and mandrel are moved by a hydraulic cylinder 27. A device 7 is heated above the feed mechanism 5 to heat the blanks before bending inductor 28. The machine works as follows. The preform 17 is placed on the feeder table 16 between the guide rails 21. An inductor 28 is supplied from above to it and is heated to a predetermined temperature. When the hydraulic motor 19 is turned on, the table together with the workpiece moves towards the mandrel 4 for the entire length of its stroke. Then the stop 18 moves the workpiece on the bending rollers 13 to the adjustable folding stop 8, which provides a symmetrical position along its length relative to the axis of the mandrel. The nozzle 23, under the action of the hydraulic cylinder 22, moves up and presses the workpiece 17 to the mandrel 4. The workpiece feed mechanism returns when the hydraulic motor 19 is reversed. The hydraulic cylinders 14 move the sliders 15 with the bending rollers 13 fixed on them and the bending of the middle part of the workpiece occurs. The power cylinder 6 then moves the rail 10, which rotates the gears 11, transmitting the rotation to the gear sectors 12 rigidly connected to the bending heads 3. When the bending heads 3 are rotated around the base axes 2, which are also the axis of the mandrel 4, the workpiece 17 bends by means of the bending rollers 13. At the initial moment of turning of the bending heads 3, the stop 8 automatically rotates so as not to interfere with their movement. Bending the ends of the workpiece 17 to the mandrel 4 is performed by a nozzle 25 mounted on the cylinder of the hydraulic cylinder 24. Then the bending rollers 13 are removed from the ring and the pressure in the hydraulic cylinders 22 and 24 is released. When the hydraulic cylinder 27 is turned on, the quill 26 moves in the oteBOM direction with the fixed mandrel 4, at the same time, the workpiece is bent abuts against the stops fixed to the frame and is removed from the mandrel 4. When nozzles 23 and 25 are retracted, the bent blank rolls down along the tray 9. Upon the return of the mandrel 4, the bending heads 3 and the stop 8 to the initial position of the fur the machine bottoms are ready to repeat the cycle. Improving the quality of the ring blanks is achieved due to the deformation of the workpiece not only by the bending moment, but also by the shearing force causing shear deformations, from rolling the workpiece on the mandrel and applying heat. In this case, the running in of rollers in the proposed device is carried out with a constant optimal force along the contour. At the junction of the ends and in the middle part of the contour, the billet is locally crimped with special nozzles installed on the rods of the hydraulic cylinders of the hem and clamp. The application of the invention allows to reduce the metal intensity of the tooling (when changing the sizes of rings it is required to change only the mandrel), to increase labor productivity as compared to flexible blanks on roller machines, and also to increase the utilization rate of the material by increasing the accuracy of bending, to reduce the metal consumption for the workpiece. by reducing the allowance for, subsequent machining from 4-5 mm to the side of forgings and stamping to 2-1.5 mm for welded blanks. The invention The machine for bending cylindrical products containing a frame mounted on the frame, bending heads, in the guides of which bending elements are installed with the possibility of translation from the power cylinders, in order to improve the quality of products by reducing the springback, bending heads are equipped driving them to rotate about an axis that coincides with the axis of the mandrel, made in the form of a power cylinder connected by a system gears with a toothed sector rigidly mounted on the bending head, and bending elements made in the form of rollers are rigidly connected with the drive of their translational movement. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 411940, cl. B 21 D 7/02, 1969 (prototype). IEi-IIA-A P