SU1138207A1 - Sheet-bending machine for bending tape shells - Google Patents

Abstract

) LEAF-PLANT MACHINE FOR THE BENDING OF CONIC SHUTTINGS, mainly the tractor air cleaner cones, containing at least one drive work roll mounted on the frame, two bending rolls, and a truncated cone-shaped drive bushings and freely rotating sleeves, differing in the rollers; in order to expand technological capabilities and increase productivity by providing flexible shells of sheets with periodically repeated relief on the surface without changing over the machine , all the rolls are made conical, the drive and freely rotating sleeves are placed on the bending rolls and have a taper angle 8-10% less than the taper angle of the work roll, while the diameter of each drive sleeve in the place of adherence to the work roll is 0.8-0, 9 of its diameter, a diameter of each freely rotating sleeve is 0.7-0.8 times the diameter of the work roll in the same section. W oo 00 1C

Description

The invention relates to the processing of metals by pressure and is intended for use in bending conical articles of sheet material. The closest to the proposed technical essence and the achieved result is a machine for bending conical shells containing at least one driven work roll mounted on a bed, two bending rolls, and driving sleeves in the shape of a truncated cone and freely rotating sleeves 1 placed on the rolls However, the known machine is designed to receive shells of a limited range of sizes. The purpose of the invention is to expand the technological capabilities and increase productivity by providing flexible shells from sheets with periodically repeated relief on the surface without retooling the machine. The goal is achieved by the fact that in a sheet bending machine for bending are conical. shells, mainly cones of tractor air cleaners, containing at least one driving work roll mounted on the bed, two bending rolls, and driving sleeves in the shape of a truncated cone and freely rotating sleeves, all rolls are made conical, driving sleeves and free rotating sleeves placed on bending rolls and have a taper angle 8-10% less than the taper angle of the work roll, while the diameter of each drive bush at the place of contact with the work roll is 0.8-0.9, its diameter a, and the diameter of each freely rotating sleeve is 0.7-0.8 times the diameter of the work roll in the same section. Thus, the possibility of producing shells of various sizes, as well as with protruding parts made on the surface, expands the technological capabilities of the sheet bending machine. FIG. 1 schematically shows a machine, a general view; in fig. 2 shows the layout of the working and bending rolls, top view; in fig. 3 is a section A-A in FIG. 2. The sheet bending machine contains frame 1, on which all the other components and parts of the machine are mounted. On an axis fixedly mounted on the frame, a driving work roll 2 is installed with the possibility of rotating, which has the form of a truncated cone, the ends of which are made cylindrical. One end of the work roll 2 is fixed in a gearbox (not shown), and the other end is mounted in a support 3. The support is mounted on the base 1 with movement. Two drive bending rolls 4 and 5 are placed on the sides of the work roll 2. Each bending roll is mounted on an axis fixed in bearings b and 7. The bearings are fixedly mounted on a carriage 8 mounted on frame 1 with the possibility of vertical movement along guides 9 and 10. Each bending roll is provided with a set of interchangeable sleeves consisting of leading 11 and freely rotating 12 located between them. Each sleeve is made in the form of a truncated cone, the taper angle of which is 8-10 ° / o less than the taper angle of the work roll 2. Diameter any driving hub in place abutting on the work roll 2 is equal to 0.8-0.9 of its diameter, and the diameter of a freely rotatable sleeve 12 is 0.7-0.8 diameter work roll in the same section. On the carriage 8 mounted receiving table 13 of the machine. The receiving table is equipped with latches 14 for orientation of the workpieces 15. The machine works as follows. Before starting work, the machine is adjusted to receive the conical shells of the required size. The adjustment consists in mounting onto bending rolls 4 and 5 in a certain sequence and in a certain number of interchangeable driving 11 and freely rotating 12 sleeves. For example, for bending of the cone of an air cleaner of a tractor, having on the outer surface protruding parts in the form of four rows of folded petals, where the gap between the rows is 5-0.5 mm, each bending roll 4 and 5 of the leading sleeves are flexible. 11, two of which are terminal (extreme), and three central ones are 4-0.2 mm wide. The distance between the drive bushings 11 is set to be 2 mm, i.e., the length of the folded petal. The gap between the leading sleeves 11 is filled with freely rotating sleeves 12, with the result that the rows of bent petals will be located above the freely rotating sleeves. The diameters of the driving sleeves 11 are made at the place of contact with the work roll 2 equal to 0.85 of its diameter, and the diameters of freely rotating sleeves are equal in each section to 0.7 of the diameter of the work roll 2. This design of the sleeves 11 and 12 provides the clearance between the surfaces of the work roll 2 and freely rotating. lok 12 equal to 3 mm. When the height of the folded petals is 2 mm, the protruding parts of the workpiece 15 enter the specified gap without deformation. After adjustment, the machine is brought to its initial position, for which the carriage 8 with bending rollers fixed on it

4 and 5 and the receiving table 13 is lowered to the lowest position, and the free end of the work roll 2 is installed in the bearing 3. Then, the workpiece 15 is placed on the receiving table 13 between the latches 14 so that the smooth surface of the workpiece faces upwards and the projecting parts touch with the surface of the receiving table 13. Thereafter, the machine is turned on, the operation of which is performed automatically. The carriage 8, together with the bending rollers 4 and 5, the receiving table 13 and the workpiece 15, rises to the upper extreme position, with the result that the workpiece 15 is sandwiched between the driving sleeves 11 of the bending rolls and the working roller 2. When the carriage is in its extreme upper position, it acts on the limit switch, which includes a gearbox, informing the rotation of the bending and working rolls. The workpiece 15, under the influence of friction forces, begins to move, while the drive bushings 11 of the bending rolls 4 and 5 bend the workpiece, and the protruding parts are above the freely rotating sleeves 12 and are not deformed during the bending process. When completing the full rotation of the work roll 2, the carriage 8 together with the nodes located on it is lowered to its lowest position, freeing the end of the work roll 2 by withdrawing the liner 3 and the part 16 is removed from the work roll. The end of the work roll is again secured in the bearing 3 and thereby brings the machine to its initial working position. Further, the operation of the machine is repeated.

Supplying a pair of bending rolls with replaceable sleeves having the shape of a truncated cone, as well as making the diameter of each drive sleeve at the place of contact with the work roll equal to 0.8-0.9 of its diameter and the diameter of each free rotating sleeve of 0.7-0.8 diameter work roll in the same - -section, allows high-quality bending of sheet blanks as with a smooth

surface, as well as with small molds made on the surface, folded petals and other protruding parts, since varying the diameters and width of the sleeves, their number and location on the axes, it is possible to bend them with leading sleeves of bending rolls in those places of the sheet blank, where the protruding there are no parts, and protruding parts pass over freely rotating bushes made of a smaller diameter than the driving bushes. In this case, small moldings, folded petals and other protruding parts do not deform during the bending process.

5 In addition, flexible shells of various sizes are provided without retooling the machine by using prefabricated sets of interchangeable sleeves. Making diameters of leading and freely rotating sleeves in accordance with the ratios relative to the diameter of the work roll, as well as making the taper angle of the sleeves less than the taper angle of the work roll, allows not only passing protruding parts over the freely rotating sleeves, but also eliminating axial displacement of the workpiece. during the bending process, and the associated crushing of the protruding parts by the drive bushings of the bending rolls. Performing the angle of taper of the sleeves and their diameters with a deviation in one direction or another from the specified ratios will lead to a longitudinal displacement of the workpiece in the process of bending and, consequently, to obtain an incorrigible defect. The proposed bending machine

5, compared with the known roller type devices, has broader technological capabilities, since it allows the bending of the shells; having a smooth outer surface, having protruding parts on the outer surface, for example, small moldings, folded petals, etc .; as well as various sizes without changing the angle of rotation of the bending rolls to the worker, i.e., without changeover of the machine. 6 11 P 72 FIG. 2 76

Claims (1)

(57.) BENDING MACHINE FOR BENDING CONICAL SHELLS, mainly tractor air cleaner cones, comprising at least one drive work roll mounted on a bed, two bending rolls, and driving bushings located on the rolls FIG. 1 ki in the form of a truncated cone and freely rotating sleeves, characterized in that, in order to expand technological capabilities and increase productivity by providing flexible shells of sheets with periodically repeating relief on the surface without readjusting the machine, all the rolls are made conical, driving and freely rotating sleeves placed on bending rolls and have a taper angle of 8-10% less than the taper angle of the work roll, while the diameter of each drive sleeve in place of contact with the work roll is 0.8-0.9 e diameter, and the diameter of each freely rotating sleeve is 0.7-0.8 diameters _{from the} work roll in the same section. ©