SU806175A1 - Multiroll pass - Google Patents

Description

one

Multi-roll gauge refers to rolling and drawing production and can be used on rolling and drawing mills with multi-gauge gauges to produce predominantly hexagonal profiles.

Multi-roll gauges formed by three or four rollers are known for producing hexagonal profiles 1

However, in three-roll gauges with a smooth barrel, the strip is crimped over only three edges, which necessitates turning the strip between passes and doubling the number of passes to compress all six edges. In the caliber formed by four rollers, two of which have a smooth barrel and two biconical, the strip is compressed in six grains at once. But this also has a place — it is difficult for the two profile angles to come to the tops of the calibrated biconical rolls and turning the strip between the passages to obtain the correct hexagon geometry.

Known multi-roll caliber formed by six rollers with a smooth barrel. In this case, the strip is crimped simultaneously over six faces, and the profile angles are formed at the junction points of the roller coils. There is no need for profile turning between passes and the total number of passes 2 is reduced by about 2 times.

o

However, all considered multi-shaft calibers, formed by three, four and six rollers, also have insufficient rigidity, both in the radial and axial boards.

One possible way to increase the stiffness of multi-roll gauges is to use support rolls. Stiffness three-roll

The 0 gauge is increased in the radial direction by supporting rolls, the axes of which are parallel to the axes of the work rolls. Stiffness in russe direction remains insufficient 3,

five

A multi-roll gauge is also known, containing work and support rolls located between workers and in contact with their external surfaces with corner surfaces at the ends of workers 4.

The disadvantage of multi-roll gauge rolls with back-up rolls is a doubling of the total number of rolls. This leads to complications in the construction of the rolling stand or die, especially with an increase in the number of work rolls in the gauge, for example to b.

The purpose of the invention is to reduce the total number of rolls and simplify the design.

The goal is achieved by the fact that between the surfaces of the support rolls the working sections of the barrel are formed, forming together with the working rolls a multi-roll gauge, while the shoulders of the even support rolls are supported by external surfaces on the surface of the recesses of the odd work rolls. In order to ensure the linear contact of the shoulders of adjacent rolls, the larger diameter of the conical collar with the external contact surface is 0.9 0, 8 smaller diameter of the conical collar with the internal conical surface.

The drawing schematically shows a six-caliber caliber.

The working surfaces of the three odd rolls 1 and the three even rolls 2 form a hexagonal caliber marked with shading. When rolling or drawing a round billet in such a caliber, compression is performed on all six faces. Moreover, all the profile angles have the same conditions for forming,

The increased rigidity of the gauge is ensured by contacting the inner shoulders 3 of the odd rolls 1 and the outer shoulders 4 of the even rolls 2. Linear contacting of the surfaces of the shoulders 4 and 3 of the odd 1 and even 2 rolls is provided by specifying their sizes,

For example, a larger diameter of the shoulders 4 should be equal to 0.9 -0.8 smaller diameter of the shoulders 3.

A similar multi-roll gauge formed by four odd and four even rollers can be used to produce octahedral profiles.

The proposed multi-roll gauge is tested in a rolling laboratory. For him, a six-roll cassette with single rollers was made on the MK-200 mill. The process of cold deformation of hexagonal profiles is carried out by a dragging force. Compared with the drawing through the multi-roll caliber, formed by the neck of the work rolls without shoulders, the number of passes decreased by 2 times.

Claims (4)

Invention Formula A multi-roll gauge containing work rolls and anvil rolls is positioned between workers and in contact with its outer surface, with the surface of the grooves at the ends of the workers, which is different in that, in order to reduce the total number of rolls and simplify the cage design, while maintaining the increased rigidity of the gauge, between the surfaces of the support rolls are made working barrels, which together with the work rolls form a multi-roll gauge. Sources of information are taken into account during the examination, 1, Vydrin V.N., et al. Cold rolling of hexagonal profiles from VTZ-1 alloy on mills with multi-roll gauges, Light Alloy Technology, 1976, 1, s, 32 - 34, 2. Authors certificate of the USSR 311677, class, B 21 s 3/08, 1971, 3, USSR Author's Certificate No. 113414, cl. On 21/17/04, 1958, 4. USSR author's certificate 422488, cl. B 21 C 3/08, 1974,