SU553023A1 - Welding Pipe Forming Mill - Google Patents

Description

one

This invention relates to the field of metal forming and welding.

A form mill is known in which the longitudinal-lateral forming of a sheet is carried out in the forming troughs, followed by the formation of the sheet in a group of drive roll calpbars equipped with guide plates.

The disadvantage of such a forming mill is manifested in a low forming speed and in the presence of considerable frictional forces causing a reduction in the surface quality of the forming pipe.

Attempts are known to eliminate these shortcomings by replacing the forming L; combines; M slit roll gauges and roller posting sections. So, for example, it is known to combine in a single forming device both slit roller gauges and roller posting sections, in connection with which the entire device has a hinged fastening relative to the next group of gauges closed around the perimeter and is provided with a driving lifting mechanism that allows setting on the appropriate trajectory of movement of the bottom of the sheet being formed.

The disadvantage of such a forming mill lies primarily in the complexity of the combined device and the impossibility of adjusting it to the different diameter of the pipes being molded.

The closest solution from the previous ones is a forming mill, in which sheet formation in slot gauges of working stands alternates with molding in sections of roller wiring, equipped with mechanisms for individual adjustment of rollers located outside the equidistant path of the edges of the sheet being formed.

However, with regard to the production of gas-welded pipes, the disadvantage of this molding mill is a low rigidity of roller posting sections compared with the stiffness of working stands with slot gauges, which significantly reduces the quality of the molding and does not allow expanding the range of shaped pipes by

increase sheet thickness.

Another disadvantage of this combination of the forming mill is the complex migration of the mill to another diameter of the forming pipes, requiring significant costs.

of time.

The aim of the invention is to increase the stiffness of roller postings to improve the quality of the molding. This is achieved by the fact that in the pipe forming mill the roller posting section

The frames are equipped with supporting arms with fixed levers, the free end of each of which is installed with the ability to interact with the roller guide sections.

On fng. 1 depicts the described mill, plan view; in fig. 2 and 3 are sections along the lines A-A and B-B of FIG. one; on fit. 4 - separation of each of the corns with the combination of external and internal rollers postings.

The forming flocks for the production of welded tubes contain successive working stands 1 with slot gauges formed by the upper 2 and lower 3 rollers. In the intervals between the stands, sections 4 of roller lines are installed, equipped with mechanisms 5 for individual adjustment of rollers 6, located outside the equidistant trajectory of movement of the edges of the molded sheet 7.

Each section 4 of the roller i-wires is formed by installing the rollers 6 together with the mechanisms of individual adjustment 5 in the housings 8 mating in the direction of movement of the formed sheet between the guides 9 and 10 of the support frames 11. The sequence is provided with driving rods 12 placed in bearings 13 and 14. A hydraulic cylinder 15 is used to drive the rods. Each bar has 12 pesetas on itself a number of levers 16 installed between the limiters 17 and 18 of their stroke relative to the bar. The levers are located at the free ends in the Iroma.ma and between the adjacent bodies 8. To disconnect the hydraulic cylinder 15, each rod is provided with a stopper 19.

FIG. 3 shows the variant where the housings 8, together with the outer rollers 6 and their mechanisms and individual adjustment 5, form on each side of the mill separate rigid forming blocks that work in combination with the inner roller leads 20 attached to the cross-bars 21 connected to the respective working cages 1. In this version of the mill, the movement of the rods 12 causes the movement of the housings 8 together with the rollers 6 and their mechanisms 5 with respect to the stationary fixed inner roller tracks 21.

FIG. 4 shows an embodiment where the individual housings 8 combine the outer rollers 6 together with their customization mechanisms 5 and the rollers 22 forming the inner roller wiring.

In this variant, separate enclosures 8, when mounted on supporting frames 11 and subsequently clamping them among themselves, form one rigid forming roller posting unit between adjacent work cages 1,

To ensure quality sheet forming, the preparation of the mill is carried out as follows4

in a way. According to the first embodiment (see Fig. 3), by the direct action of the two hydraulic cylinders 15 of the casing of the 8, they are shifted in the direction of movement of the moldable

sheet relative to the extreme stop 23, forming a rigid forming block between the adjacent stands 1, after which the position of the rod 12 is fixed by a stopper 19. Zatom.m mechanisms of individual tune 5 provide the desired position of the rollers 6 sections 4.

According to the second variant (see Fig. 4), the adjustment of the rollers 6 and 22 in the coruses 8 is carried out outside the line of the stack, after which the bodies are fixed to the support frame 11 and the direct action of the hydraulic cylinders 13 followed by a similar fixation of the stem 12 to provide a hard forming unit. As sheet 7 arrives, its forming

In slot gauges, stands 1 alternate with additional molding of 4 roller lines in the interstand sections.

After the molding is completed during irenation or repair, the unclamping of the housings 8 is carried out in a reversible sequence: the stopper 19 is released, the hydraulic cylinder 15 is turned on, by means of which through the rod 12 the levers 16 alternately push the housings 8 apart, iairimer, for some distance between them.

Then the crown with rollers can be partially or completely removed from the mill, rearranged, freeing up access to mechapisms, nodes of the stack and, moreover, can vary the number of forming rollers depending on the assortment and pipes produced on the unit.

The mechanized possibility of the formation of rigid forming blocks in the proposed mill allows precise sheet forming and, consequently, obtaining quality pipes, as well as quick and convenient mill service.

Claims (1)

Invention Formula A forming mill for the production of welded pipes, mainly gas pipelines, containing alternating work stands and roller post sections with mechanisms for individually adjusting the rollers, mounted on the support frames and located equidistant movement trajectories edges form a sheet, characterized in that, in order to increase the rigidity of the roller guide to improve the quality of the molding, the section of the roller guide is installed in the support frames with the possibility of movements along the mill axis, and the support frames are equipped with driving rods with levers fixed on them, each of which is free to interact with roller posting sections. tS IS I:. Z 10лп .ЛТ 7 /// // 7 ///// 7 -tllJ