SU768499A1 - Roll for pilger tube rolling - Google Patents

Description

The invention relates to pipe production, and more specifically to the main deforming tool (roller) of mills for piligrim rolling of pipes, mainly in the cold state.

A known roll for pipes, having a brook of variable cross-section along the barrel circumference and conic ribs, along the whole perimeter of which teeth are cut, which prevent the metal from flowing into the outlets and serve to drive the rolls forming the caliber l.

The disadvantage of this design is the reduction in the surface quality of the finished pipes due to the formation of tooth prints on it. This is due to the indentation of the lateral surface of the teeth in contact with the metal into the body of the pipe during its deformation.

The closest to the technical solution to the proposed is a shaft for stepwise rolling of tubes, containing a shaft, a replaceable caliber mounted in its recess, having rims and a stream with idle and working sections 2.

The disadvantage of this roll is the restriction in limiting the allowable partial reductions per pass, due to the possibility of metal flowing into the gaps between the flanges of the caliber with the formation of whiskers.

The aim of the invention is to increase the allowable reduction per pass.

To achieve this goal, in the proposed pilger roll for rolling, containing a shaft, a caliber installed in its notch, having flanges and a stream with hollow and working sections, on a part of the flanges 0.5-0.6 times the length of the working section of the stream from its beginning teeth are made, the height of which is O, O 4-0,12 of the radius of the flanges, and the diameter of the pitch circumference of the teeth is equal to the diameter of the flanges.

These differences are due to the presence of teeth on the flanges only at the beginning of the roll, i.e. on the crimp part and the smooth surface of the flanges at the end of the roll, the precalibrating and calibrating sections provide an increased feed rate and per pass due to rolling in the closed gauge without deteriorating the surface quality of the pipes, since

The prints of the teeth formed on the workpiece in the process of its deformation by the initial crimping section of the stream, with further deformation, are rolled up by a smooth roll flange. . Figure 1 shows the swath, general vi, figure 2 - section aa in figure 1. ; The valrk for pilgrimage of rolling pipes contains a shaft 1, in the cutout of the second 27 hundred. replaceable caliber 2, KMsSuKR rims 3 and creek 4 with a raboytim site of length L / and idle sections of feed 5 and turning b. Pa chadgby fenders with a length of E, equal to 0.5–0.6 of the length of the working Section (0.5–0.6) of its beginning, are full, we have a tooth 7, and the rest of the child's edge is smooth.

The dimensions of the area of the flanges of the caliber, on which the teeth are made, are as follows. Osnopo 33bzha y blanks (up to 90%) with the use of a clamping area, length. Which srstyldet usually bkoly 0.6 dliny rabs5 egy teaching: with TYO ;. . . The presence on the flanges of the caliber O, 50, b of the LENGTH of the working section (from its beginning) provides the possibility of th | 5OKTka rubbish without vyggyLay metal V caliber caliber .P15is; 1Y sh; oyetyeniyeno. Core reductions. At the same time, the presence of teeth on the flange of the working j 4acTKa part less than 0.5 of its length does not provide sufficient EA of the gauge flatness, and making the teeth on not more than 0.6 the length of the working section leads to undetected tooth prints. ,

Vyzzot'ev is chosen such that, on the one hand, to prevent a churning of the caliber output at the moment of the most intensive deformation of the billet on the side, to ensure the minimum Possible imprint of the teeth on the surface of the trub.

The height of the teeth is 0.040, 12 pd of the flange (Rp), and the diameter of the pitch circle (Dg) of the teeth {) a1Vyddyamet |) At the flange. ;

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VZBTZUBEZ-ev less than 0.04 from the radius of the flanges does not prevent the metal to be pressed into the gap between the Rollers due to the small overlap L11a-vip7eSH1ZHBVU and take more teeth 0.12 from the radius of the ribs 1yo Mest6 increase the size of the test. which degrades the quality). Limits of height change from 0.04 to 0.12 from the radius of the flanges

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; rolls are selected taking into account the assortment and sizes of rolls of HPT mills.

In the case of using ring or horseshoe-shaped gauges, the length of the section for cutting teeth in relative terms remains the same. the same is 0.5-0.6 the length of the working part of the stream.

In the process of work, the rolls, moving together with the cage (not shown in the figures), make a reciprocating movement and rotational-rolling movement due to: 8 gears installed on their necks (not shown in the figures). In the process of moving, the rolls to 0,, 6 lengths of the working section make - the main (89-90%) compression of the workpiece 9 on the mandrel 10. At the same time, the presence of teeth on the flanges of the caliber will prevent the metal from flowing into the kaliber outlets. ; -. / ..: In the process of further compression of the bandage (20-10% of the total deformation), the final formation of the finished pipe and the smoothing of the area formed. kov teeth since the deformation of the workpiece is relatively small, the metal does not flow into the outlets. Caliber does not occur even when there are no teeth on the flanges. . . .

The proposed roller provides increased compression without reducing the surface quality of the finished tubes and increased: the flow of the workpiece during the rolling cycle.

Claims (2)

1. US patent No. 3044331, 5 cl. 72-194, op. 1962. , 2. Shevakiy Yu.F., Seidaliev F.S. Mills cold rolling tubes. Metallurgists, 1966, p.8 (prototype).