SU994078A1 - Method of piecewise manufacturing of bent sections - Google Patents

Description

one

The invention relates to the processing of metals by pressure and can be | used to make parts from flat blanks.

The known method of making curved profiles, which involves forming profiles by transitions in rolls of a roll forming mill, by which, when forming asymmetrical flat blanks, the workpiece is oriented relative to the profiling axis before the start of forming, is fed in a fixed state to the first pair of rolls, where grooves parallel to lines are applied m bending, then shaping is carried out in a position oriented along these grooves, after which in the last pairs of rolls the material in the groove zone is smoothed with C 1.

However, in piece-wise profiling due to reverse elastic recoil (springback), the parts have a buckling, i.e. shape distortion

front and rear ends. In addition, the known method has limited technological capabilities, since it provides for the obligatory fulfillment of the condition — the minimum length of the workpiece must be at least twice the distance between the axes of the work rolls of the adjacent stands. Such a length is necessary in order for the workpiece to be simultaneously located in at least two adjacent cages.

The aim of the invention is the possibility of obtaining profiles from workpieces, which has a 1-km minimum length less than the double distance between the roll axes of the adjacent stands.

Claims (2)

For this purpose, in the case of piece-by-piece production of curved profiles in the roll-forming mill, in the manner that the workpiece is oriented relative to the axis of profiling, and then profiled by transitions in the rolls, the workpiece is installed in a guide element, pre-oriented relative to the axis of profiling, the profiling t with simultaneous movement of the guide element with the workpiece along the profile axis, and after finishing the profile, the profile is separated from the guide its element. FIG. Figure 1 shows the scheme of the mill for the manufacture of curved profiles according to the proposed method; in fig. 2 is a top view of FIG. one; FIG. 3, section A-A of FIG. 2. Initially, the workpiece 1 is placed in a guide element 2, pre-oriented relative to the axis of profiling by technological annular grooves 3 in roll forming rolls k and side rollers 5, and fixed with an overlay 6, for example, through technological holes 7 located in the workpiece. Moreover, the workpiece is fixed on the guide element 2 in such a way that its section S, which is in contact with the guide element 2, is not subjected to plastic deformation. Fixing the workpiece in the guide element 2 by the plate 6 is carried out so that the workpiece is The mutation is in the clamped state along the entire length of section S, which creates conditions conducive to a significant decrease in buckling. Forcing the movement of the guide element 2 when the blank is fed into the first profile-bending pair. rolls C, its further shaping in subsequent rolls and the withdrawal of the part from the last pair of rolls are carried out by the movement mechanism 8. The part is separated from the guide element 2 when the lining 6 is removed. After removing the part, the lining is installed on the guide element 2, which displacement B is moved to its original position. The forced movement of the guide element 2 is carried out in such a way that its linear speed sufficiently accurately coincides with the angular velocity of the surfaces of the technological annular grooves 3 of the bending rolls 4 which are in contact with the guide element 2. The proposed method allows to improve the quality by reducing the longitudinal bending of the part due to tight clamping of the workpiece, carried out during the whole process of shaping, expands the technological capabilities of the roll forming process, as it creates the conditions of the workpiece of bent parts, the minimum length of piece piece for which is less double the distance between the axes of the bending rolls of neighboring stands, contributes to the replacement of the currently used method of bending on presses with a more progressive and productive profiling. Claims The method of production of curved profiles in the cells of a roll forming mill, which consists in the fact that the workpiece is oriented relative to the axis of profiling, and then shaped by transitions in the rolls, characterized in that, in order to obtain profiles from the workpieces, the minimum length is less than double the distance between the axes of the rolls of the adjacent stands, the workpiece is set in a guide element pre-oriented relative to the axis of the profiling, the profiling is performed with one temporary forced displacement of the guide member along the workpiece axis profiling, and after completion of the shaping profile are separated from the guide member. Sources of information taken into account in the examination 1. USSR Author's Certificate (f 6A2043, cl. B 21 D 5/06, 06/06/76 (prototype) .. A