RU2028847C1 - Shape bending machine - Google Patents

Abstract

FIELD: metal treatment by pressure. SUBSTANCE: shape bending machine to produce thin-walled shapes, made from flat sheet billets by restricted bending has placed in manufacturing sequence driven forming stands (for preliminary and final shaping ) with rollers pairs, that have closed shaping clearance, and apparatus for dressing. In the case stand for preliminary shaping, that is capable of movement in vertical and horizontal planes, is provided with overtaking coupling. Apparatus for dressing is capable for rectilinear longitudinal movement. Value of minimum distance between forming stands is given by definite dependance (see original). Dimensions of shape bending machine are significantly less, than dimensions of other known machines, therefore machine has decreased metal consumption. Machine requires less power and production space. Cost of shapes, produced by machine, is low and quality - high. EFFECT: shape bending machine is used in metal treatment by pressure. 2 dwg

Description

 The invention relates to the processing of metals by pressure and can be used in the manufacture of profiles.

 Known roll forming mill (ed. St. N 1359982, class B 21 D 5/06, 1985), which contains a series of sequentially installed work stands with work rolls located one above the other, kinematically connected to electric motors by means of a gearbox, camshaft and gear stands .

 In each working stand, in addition to two rolls forming the calibers of the first level of forming the profile, a roll is installed that forms additional calibers of the second level of forming of the profile with the middle roll.

 The disadvantages of this roll forming mill are large dimensions, significant metal consumption, the difficulty of reconfiguration, the difficulty of controlling the geometric parameters of the profile during its formation.

 The closest technical solution to the invention is a machine in which drive forming stands for preliminary and final shaping and pulling stands with roller pairs having a closed profiled clearance and a drive with a different number of gear teeth installed in bearings with an arrangement are installed in a technological sequence and alternating order gears in one vertical plane with the same center distance. Moreover, the gears of the drive shafts of the forming rollers are interchangeable to provide different angular speeds of rotation of the shafts due to the different number of teeth of the interchangeable gears.

 It should be noted that the profile formed by the described machine is of poor quality due to scratches and scoring, obtained due to different angular rotation speeds of the feed, forming and calibrating rollers.

 In addition, to ensure different angular velocities and the necessary relationship between them, frequent replacement of gears is needed. It is difficult to establish the necessary rotation speeds of the feed and calibrating rollers.

 It is practically impossible to obtain non-curved (straight) profiles on this machine and an additional machine is required for straightening them. At the same time, the production of a profile even of simple geometry (corner, channel), although it will be carried out on this device in two transitions, will require the presence of at least five pairs of rollers, two pairs of which will be forming, two will be pulling and one will be calibrating.

 An object of the invention is to reduce the dimensions of the machine while improving the quality of manufactured profiles.

где К - коэффициент учета размерного фактора заготовки;
θ_п ^max - максимальный угол подгибки;
b_max - максимальная ширина подгибаемой полоки;
r - внутренний радиус при стесненном изгибе;
S_o ^min - минимальная толщина заготовки;
R - внутренний радиус при обычной гибке
(r/R)_min = 1/3.For this, a bending machine for manufacturing thin-walled profiles from flat sheet blanks with a constrained bend, containing drive forming stands installed in the technological sequence for preliminary and final shaping with roller pairs having a closed profiling gap, is equipped with a straightening device installed with the possibility of rectilinear longitudinal movement, stand pre-forming is equipped with an overrunning clutch and installed with the possibility of moving tions in the vertical and horizontal planes, and the value of the minimum distance between the forming roll stands is determined by the following relationship:
L = K

where K is the coefficient of accounting for the dimensional factor of the workpiece;
θ _p ^max - the maximum angle of bending;
b _max - the maximum width of the foldable shelves;
r is the inner radius with tight bending;
S _o ^min - the minimum thickness of the workpiece;
R is the inner radius during normal bending
(r / R) _min = 1/3.

 An essential feature of the technical solution is a completely new technological sequence of using standard assemblies in the inventive machine (a self-aligning pre-forming unit — a final forming unit — a self-adjusting device for straightening the profile) equipped with an independent drive with an overrunning clutch.

 Such a technological sequence allows to intensify the process of shaping by imposing axial tension on the workpiece in the smooth transition zone in front of the rollers of the profiling transition and thereby contributing to the creation of an additional bending moment, and at the final stage of shaping, through the use of a self-adjusting device that most effectively prevents the formation of any deviations from straightness in a profile formed in closed profiles ovannom nip rollers.

 Figure 1 shows the machine; figure 2 is the same plan.

 The roll forming machine contains a bed 1, to the guide strips of which, with the possibility of moving left-right and up-down, a pre-shaping stand 2 with an independent drive 3 and an overrunning clutch 4 is attached. A profiling stand 5 and a stand 6 of the final shaping are installed in the technological sequence, behind which has a device 7 for editing the profile with the ability to move it along the groove of the bed. Roller pairs of stands 5 and 6 have a closed profiled gap (not shown in the drawing). The stands 5 and 6 have a drive 8.

 Profile bending machine operates as follows.

 The workpiece is fed into the working rollers of the cage 2 of the preliminary shaping, then to the first pair of rollers of the cage 5, which have a slightly higher linear speed than the rollers of the cage of the preliminary shaping, as a result of which the overrunning clutch 4 of the drive 3 of the preforming cage is activated. In this case, the rollers of stand 2 become non-driven and begin to work in the drawing mode, which creates more favorable conditions for the shaping of the workpiece. The last pair of rollers of stand 6 has a closed working circuit, which allows creating a compressed volumetric stress state of the metal in the deformation zone. From the last stand 6, the profile enters the self-adjusting device 7 for editing the profile, with the help of which the conditions for the formation of a straight profile in the deformation zone are created.

 A GPS-200M1 pilot-industrial machine has been designed and manufactured for which the maximum workpiece width is 200 mm, found by experimental extrapolation.

= 225 мм
На данном станке, имеющем всего три формообразующие клети, были изготовлены профили различных конфигураций (до 18 зон сгиба).R = 1/6
θ _n ^max = π / 4
b _max = 90 mm
S _o ^min = 0.5 mm
(r / R) _min = 1/3
The spacing is
L =

= 225 mm
On this machine, which has only three forming stands, profiles of various configurations were made (up to 18 bending zones).

 The use of the bending machine according to the invention allows to obtain a high quality profile, and the dimensions of the bending machine are much smaller than the known ones and the metal consumption of the machine is reduced. At the same time, the reliability of the machine was increased, the time for readjustment was reduced, and the range of profiles was expanded. The machine saves energy and floor space, reduces the cost of profiles obtained on the proposed machine.

Claims (1)

PROFILE BENDING MACHINE for the manufacture of thin-walled profiles from flat sheet blanks with a constrained bend, comprising drive forming stands installed in the technological sequence for preliminary and final shaping with roller pairs having a closed profiling gap, characterized in that it is equipped with a straightening device installed with the possibility of straight longitudinal displacements, the preforming stand is equipped with an overrunning clutch and installed with a possible Stu movable in vertical and horizontal planes, and the value of the minimum distance between the forming roll stands is determined depending on

where K is the coefficient of accounting for the dimensional factor of the workpiece;
θ _{p max} - the maximum angle of bending;
b _{m a x} is the maximum width of the foldable shelf;
S _{0 m i n} is the minimum thickness of the workpiece;
r, R is the inner radius with tight bending and with normal bending, respectively, (r / R) _{m i n} = 1/3.

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