SU1148668A1 - Working stand for section bender - Google Patents

Abstract

WORKING CHIP OF THE PROFILE-BENDING MILL, containing a bed with working rolls installed on it and a pair of non-driven auxiliary rolls located in front of them, installed with the possibility of adjusting movement in the vertical direction, characterized in that, in order to expand technological capabilities by creating transverse tensile or compression forces, it is provided with an additional pair of non-driving auxiliary rolls placed in front of the work rolls, while both pairs of non-driven supporting rollers mounted for independent rotation in a plane perpendicular to the axial plane of the working rolls, and the line extending through the centers of rotation of both pairs of irreducible 0 subsidiary rolls, parallel to the longitudinal axis of the working roll. 4 00 05 05 00

Description

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The invention relates to the processing of metals by pressure, in particular to equipment for the profiling of sheet blanks, and can be used mainly in mechanical engineering in the manufacture of sheet-bent sections and black metal.

The working stand of the roll forming mill is known, containing work rolls mounted on the bed and parallel non-driven auxiliary rolls arranged with the possibility of installation movement in the vertical direction Cl

A disadvantage of the known stand is the impossibility of providing transverse stretching of the workpiece in front of the work rolls, which degrades the quality of the fabrication of the profiles.

The purpose of the invention is the expansion of technological capabilities by creating lateral tensile or compression forces in the workpiece before the working rolls. The aim is achieved by the fact that the working stand of the roll forming mill containing the frame with work rolls mounted on it

and a pair of non-driving auxiliary rolls located in front of them, installed with the possibility of adjusting movement in the vertical direction, is provided with an additional pair of non-driving auxiliary rolls placed before. working rolls, while both pairs of non-driving auxiliary rolls are installed with the possibility of independent rotation in a plane perpendicular to the axial plane of the working rolls, and the line passing through the turning centers of both napi rolls, and the line passing through the turning centers of both pairs of non-driving auxiliary rolls rolls parallel to the longitudinal axis of the work rolls.

Figure 1 shows a working stand roll forming mill; in Fig.2 a section aa in Fig.1; on fig.Z - section bb in figure 2; Fig. 4 is a diagram of the arrangement of the auxiliary rolls providing lateral stretching of the strip during forming; Fig. 3 is the same, providing lateral compression during molding.

The proposed working stand of the Roll Forming Mill contains a bed 1 in which the work rolls 2 and pairs of auxiliary shafts are installed86682

3 located on the rotary supports 4, which with the help of bolts 5 and nuts 6 are attached with the possibility of rotation around the axis 7 on the brackets

five . 8, having slots 9, made in an arc. Independent rotation of pairs of auxiliary rolls 3 (i.e. rotation of each pair by a different angle d} is provided by separate fastening elements (bolts 5, nuts 6,

Prorez 9) for each of these pairs. The arms 8 have the ability to move vertically along the guides 10 of the frame 1. In this case, their installation movement is carried out with the aid of a screw pair 11, and the clamping force is created by the power cylinders 12 and transmitted through the auxiliary rollers 3 to the strip .13.

0 The device operates as follows.

In the initial position relative to the axial plane of the work rolls 2, the auxiliary rolls 3 are divorced,

5, the strip 13 freely passes between them and is set into work rolls 2. Then the strip 13 is clamped between the auxiliary rolls 3 by means of power cylinders 12. Traction

0 by the force generated by the work rolls 2, the strip 13 moves through the cage at a speed V. The section of the rolls 13 clamped between the auxiliary rolls 3 is braked by them.

In this case, the metal is stretched in the longitudinal direction by moving the strip through the auxiliary rolls 3 at a lower speed V (longitudinal component V speed) than through work rolls 2 (speed V) i

The transverse components of the speed of movement of the band Vj, depending on the relative position

the pairs of auxiliary rolls 3 contribute to the lateral stretching or contraction of the strip in front of the work rolls. So, if the intersection point is 8 longitudinal axes xx

the auxiliary rolls 3 are displaced from the line V-i / passing through the points O of the axes of rotation of the pairs of auxiliary rolls 3 towards the work rolls, the strip is stretched in

transverse direction. If point B is shifted in the opposite direction from the v-- line, then the strip is compressed. As the angle of rotation of the auxiliary rolls increases, the stretch of the strip increases in the longitudinal direction and the stretch (compression) in the transverse direction. As shown by the data of an experimental test carried out on a laboratory mill equipped with two pairs of auxiliary rolls with a diameter of 50 mm and working rolls installed at an angle to the axial plane, the working capabilities of the working stand are expanded. Thus, when forming with the installation of pairs of auxiliary rolls in accordance with the scheme in FIG. 4 (angle ot 15 °), the strip (130 mm wide, 1 mm thick from aluminum) stretches transversely in front of the working rolls, which allows forming on it The bottom of the longitudinal round edges of the corrugation is 6 mm high, mainly due to the metal drawing (width of profile is 3 mm less than the width of the strip, whereas when forming without the use of auxiliary rolls, the width of the profile decreases by 12 mM compared to the width of the strip). When forming a profile from the same billet with a single trapezoid corrugation 30 mm high and 30 m wide when the auxiliary rolls are installed, they are according to the diagram corresponding to FIG. 5 (angle ot AOR), a compression is created on the strip in front of the work rolls, which leads to a loss of stability of the strip and its transverse bending. As a result, the width of the workpiece in front of the work rolls is reduced by 23-27 mm. This allows the trapezoidal corrugation to be molded in one stand. Without the use of auxiliary rolls for forming such a corrugation, two technological transitions would be required. When carrying out the above experiments, an increase (8–12 times) in the longitudinal stretching of the metal between the auxiliary and work rolls was recorded. According to the data of laboratory experiments, the present invention, in comparison with the known, provides lateral stretching of the strip in front of the work rolls, which allows to obtain high-quality profiles, mainly with epementam, formed by the stretching of metal, transverse compression of the strip in front of the working rolls, which allows to tighten moldings, for example, to obtain profiles with relatively high elements — on the central areas, mainly from thin sheets, in one technological transition d (instead of two or three), creates an uneven across the width of the strip, the longitudinal stretching (compression) of the metal, which provides for asymmetric profiles, significantly (8-12 times) increases the longitudinal stretching of the strip.

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FIG. four

FIG. five

Claims (1)

A WORKING CELL OF A PROFILING MACHINE, comprising a bed with working rolls mounted on it and a pair of non-driven auxiliary rolls located in front of them, installed with the possibility of installation movement in the vertical direction, characterized in that, in order to expand technological capabilities by creating lateral forces in the workpiece in front of the working rolls tension or compression, it is equipped with an additional pair of non-driven auxiliary parts placed in front of the work rolls, both of which ry non-driven supporting rollers mounted for independent rotation in a plane perpendicular to the axial · hydrochloric plane of the work rolls, and the line passing through cent ry · irreducible rotation of both pairs of auxiliary rollers, parallel to the longitudinal axis of the working roll. FIG. J ' 1 1148668