SU1468621A1 - Process tool for rolling mill - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used during cold pilgrim rolling on roller mills. The purpose of the invention is to improve the accuracy of pipes and reduce rolling forces. Technological tool contains calibrated supporting strips and three stream roller 2, forming a caliber. The caliber creates a symmetrical deformation center, in which the sections and flanges defined by the radius equal to the billet radius, then the brook sections outlined by radii less than the radius of the billet, but more than the radius of the finished pipe, come in contact with the metal at the beginning of each brook release. Moreover, each subsequent section, which comes into contact with the metal, is outlined with a smaller radius than the previous one in the direction from release to version, outlined by an arc with a radius equal to the radius of the finished pipe. The section of each stream between the 6p-7p central arc and the 1p-2p arc at the flange consists of equal arcs, 4p-5p, 5p-6p, the number of which is equal to the number of the corresponding sections (In-7p) of the support bar. The centers of the radii (01-05) of these meadows lie on the axis of symmetry of the stream at distances equal to the difference in height of the adjacent sections of the bar. 4 Il 2 I, U5 L 4 O5 00 O5 to

Description

The invention relates to the processing of metals by pressure and can be used in cold piligrim tube rolling, mainly in roller mills.

The purpose of the invention is to improve the accuracy of pipes and reduce rolling forces.

FIG. 1 shows an instrument, a general view; in fig. 2 caliber, formed by three stream rollers; in fig. 3 - support bar; in fig. 4 - roller stream.

The technological tool includes calibrated bearing strips 1 and three stream rollers 2, pins 3 of which interact with the slats.

The stream of each roller is outlined by arcs, the centers of radii of which are on the axis of symmetry of the stream, and the values of the radii of arcs vary from a radius equal to the radius of the finished pipe () for central arcs to the radius of the workpiece (R: R3ar) for arcs at the flanges. The 6p-7p sections of the arcs and the stream (Fig. 4) are delineated, the sections 1p-2p -, the remaining sections 2p-3p, 3p-4p. 4p-5p, 5p-6p have radii lying within

.. CHISLO

the sections of the arcs delineating the stream are equal to the number of sections of the support bars 1p-7p (Fig. 3), the centers of the radii of the arcs of the adjacent sections have a stream on the axis of symmetry and they are separated from each other by the value of the difference in height of the adjacent sections of the slats. The center of the radius of the central arcs 6p-7p corresponds to the point O (Fig. 4). The center of the radius of arcs 6p-5p is separated from point O by an amount (Fig. 3) equal to the difference in height of the planks in sections 6p and 5p and corresponds to point 05 on the axis of symmetry (Fig. 4). The center of the radius of the arcs 5p-4p is separated from point 05 by an amount equal to the difference in height of the planks in sections 5p and 4p and corresponds to point 04 (Fig. 4), the other centers are determined similarly and are located at points 03, 02, 01 (Fig. four).

The tubes are rolled as follows.

The tube is deformed on the mandrel by the rollers 2, which are supported by the pins 3 on the support bar 1 in a closed symmetric caliber. As you move the rollers from

the beginning of the working cone to its end sections of the stream in the direction from the flanges to the center of the stream alternately come into contact with the metal, i.e. the first parts come in 1p-2p, the last - 6p-7p (Fig. 4), which corresponds to moving the roller support plate, respectively, from section 1n to 7n (Fig. 3). Thus, a correspondence is achieved between the law of change in the profile of the working cone and the cross-sectional profile of the roller stream, which

g allows to reduce dramatically the unevenness of deformations, the level of residual stresses, ensures the formation of a pipe wall of increased accuracy simultaneously in each stream.

Zri rolling tube using

0 of the described technological tool was able to reduce the longitudinal cuts on the surface and the transverse wall thickness to 1.1%, significantly reducing the axial forces on the workpiece.

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Claims (1)

Invention Formula Technological tool of a roller mill, containing calibrated bearing strips and three strand rollers interacting with them, forming a gauge, each of which has a stream outlined by a central arc with a radius equal to the pipe radius, and at the flanges an arc with a radius equal to the work radius with the location radius centers on the symmetry axis 5. A brook, characterized in that, in order to increase the accuracy of pipes and reduce rolling forces, the section of each roller brook between the central arc and the flange arc is made up of equal arcs, the number of which is equal to the number of the corresponding sections of the support bar, and their centers of radius lie on the axis symmetry, a creek at distances x equal to the height difference between the adjacent portions of the slat. 0 7n Sn 5n p Sn 2n In FIG. / FIG. 2