SU850249A1 - Roll three-radius pass assembly - Google Patents

Description

I

Synthesis is related to rolling production and can be used in the production of closed products to improve quality, intensify the process and provide conditions for unambiguous deformation of profile sections.

The block of three-radius roll calibers of the stands of a continuous pipe-profan mill is known. In this camp, the radii of rounding angles of calibers in the first cells are taken by bolpi and decrease by power dependent X to the last caliber to a radius equal to the radius of rounding of the corners of the finished profile. This mill allows you to accurately get all the parameters of calibers |.

However, in a known mill there is no possibility of intensively forming profile corners in the first cells of the mill, since radii of rounding gauges are 3-4 times more than the radii of the finished one. Dougie

Cornering angles are formed in the last cages, where the metal is already hardened, therefore the metal in the corners in the last calibers of the mill does not enter and it is impossible to get the specified angles on the finished profile, and since the pipe has a cross section, mechanical properties and different wall thickness, then the radii of corners and roundings on the finished profile are different.

10 In addition, in the first stands of the mill, where the metal has not yet been hardened, it is impossible to obtain small radii of rounding, since the gauges have large corner radii} of rounding.

15

The purpose of the invention is to improve the accuracy of the geometrical dimensions of the finished profile.

The goal is achieved by the fact that the rounding angles of each Caliber in the first half of the mill are described by arcs whose radius is 2-3 times smaller than the radius of the arcs of rounding angles

caliber in the second half of the mill.

The drawing shows the quadrants of calibers; where O is the caliber with the tube of the first mill stands; b is the caliber with the tube of the last stand of the mill; moreover, the angle J is indicated by rounding calibers in the first cages, where metal does not fill the caliber and corner 2 of the rounding gauges in the last glue where the metal fills the gauge. . L | rokatka about Snyh tubes in the proposed calibers is carried out in the following way IM IM.

The gauges of the first stands in the corners of rounding are described by arcs, the radius of which is 2-3 times smaller than the radius of the rounding corners of the last calibers of the mill. In the first gauges of the mill, the tube is deformed with the ribs whose radius of rounding is obtained to be close but unequal to the radius of the corners 1 of the round gauges. The inequality of the radii of rounding of the corners of the caliber and profile is due to the fact that the metal does not fill the corners of the caliber with small radii. But with the ratio of the radius of the rounded corners of the calibers of the first stands of the mill and the last equal to 2-3 on the development in the first calibers, the ribs with the radii of rounded corners of the last stands of the mill are obtained. From the last calibers the pipe comes out with edges of a radius {whose whiskers are rounding off equal to the radius of the rounding angles of the last calibers and equal to Ы (в1 between each other).

PRI me R. In the first stands, calibers of which it has a radius of rounding of corners, equal to 5 mm, pipe is specified. In these calibers, a pipe is obtained with pe6pa ai, radii of which are rounded 8 to 9 "m, because the metal does not fill the above caliber. This pipe enters the last calibers, the radii of rounding of the KOTOpibtx angles are 2-3 times the radii of rounding of the corners of the first calibers and are equal to 1015 mm. In the last calibers, the pipe de: form b1 and gets ribs with a radius of rounding, equaling radius of rounding of the 2 corners of these, selected by paBiSia "to the required radius of rounding of the corners on the finished one. the pipe.

Ratio pawiycoB rounding the corners of the calibers of the first gay mill

and the last 1: (2-3) derived from experimental data. Only with such a ratio does the angles of the calibers of the first stands of the mill be filled with metal, and in the latter the metal of the pipe is deformed in the corners. If in the first calibers of the mill with rounding radii of 5 mm the pipe is made with ribs with rounding radii of 8-9 mm, since the metal does not fill the calibers angles (experimental data and test rolls), in the last calibers to ensure profile deformation at angles It is necessary to have rounding radii larger than the rounding radii on the pipe entering these calibers from the first stands, i.e. in the first cages of the mill, the pipe is obtained with rounding radii of 8-9 mm and goes to the last rounds with rounding radii of 10-15 mm (my It is possible to have calibers with rounding radii of 10 mm, since 10 8 - 9, it is possible 15 mm, more, since the pipe loses stability. The interval of 10-15 mm is accepted as required by the customer of the pipes. Therefore, a ratio of 5: (10-15 I : (2-3) ,.

The proposed block of three-gauge roll gauges makes it possible to obtain shaped tubes with a target diameter and equal radii of profile angles, and also to reduce compression to 5%, which results in a reduction in energy costs and energy savings of 10-17%. Reducing crimping allows dp profiling to use billets of smaller diameter, which saves metal by 4-6% per ton.

The proposed invention can be used in enterprises producing closed closed pipes of straight and square cross sections.

Claims (1)

1. USSR author's certificate No. 298402, cl. B 21 C 37/06, 1969.