RU2741875C1 - Method of rolling assymetric angular profiles - Google Patents

Abstract

FIELD: rolling mill products.SUBSTANCE: invention can be used when rolling an asymmetric angular profile, mainly for railway use, such as a counter rail angle. The method includes multi-pass reduction of the heated billet in rolls with grooves, the initial formation of a profile in asymmetric box grooves and after tilting by 90°, rolling in alternating open and closed shaped preparatory grooves and the final formation of the profile. The final shaping of the profile is carried out in a prefinishing caliber, which is a control one, and rotated by 45° relative to the finishing and previous calibers with the location of the caliber connectors in the surfaces forming a radius (R10) conjugated with an 8% caliber issue and a radius (R3) 5 mm conjugated with the contact surface with the rail base, with a roll gap of 5-8 mm.EFFECT: increase in the stability and quality of rolled products.1 cl, 3 dwg

Description

The invention relates to rolling production and can be used when rolling asymmetric angular profiles, mainly railway ones, such as a counter-rail angle, characterized by shelves of different thickness and width, both shelves of variable thickness in width.

There is a known method of rolling asymmetric angular profiles [1] (RF patent No. 2288048 "A new method of rolling asymmetric angular profiles", MPK8 B21B1 / 09, publ. 27.11.2006, bull. No. 13), including multi-pass compression of the workpiece in rolls with calibers, when where the initial formation of the profile begins in four symmetric calibers, of which the first two are horizontal ten-sided shapes, and after turning the roll from the second caliber, it is set into a vertical octahedral caliber, flipped and rolled in a diamond-shaped caliber, flipped and continued rolling in the preparatory rib caliber of the bell a view with an opening shifted in height and with the shape of the side edges formed by the upper and lower streams, identical to the shape of the closed stream of the next cut shaped groove in the course of rolling with the obligatory combination of identical elements of the roll and the caliber when gripping, and the final design of the profile is carried out in three subsequent shaped corner gauges.

The closest in technical solution and achieved results is the method of rolling asymmetric angular profiles [2] (RF patent No. 2254942 "Method of rolling asymmetric angular profiles", MPK8 B21В1 / 08, publ. 27.06.2005, bull. No. 18), including multi-pass reduction billets in rolls with grooves, in which the formation of the profile begins in asymmetrical box grooves and after rolling the rolled stock by 90 °, rolling continues in alternating open and closed shaped preparatory grooves with the same angles and radii of curvature at the tops of the upper grooves and the same values of angles and radii of curvature on the crests of the lower grooves of calibers, and the final design of the profile is carried out in pre-finishing and finishing calibers having the same openings and ensuring equality of the minimum diameters along the shelves in the grooves of the lower rolls.

The disadvantages of these methods is the use of closed calibers with a connector of calibers located on R6 ... 15 and R12 MAX, which leads to an overflow of the calibers with metal and the formation of "stripes" and "whiskers" on the rolled surface in the connector of the calibers, which require additional mechanical processing of the reference surfaces to the required radii of their rounding.

The technical result of the present invention is to improve the quality of the rolled profile due to the precise implementation of its geometry and elimination of twisting, guaranteed obtaining the required radii of curvature in the places where the calibers are split, and increasing productivity.

The specified technical result is achieved by the fact that the method of rolling asymmetric angular profiles, mainly railway ones, such as a counter-rail angle, including multi-pass reduction of a heated billet in rolls with grooves, the initial formation of a profile in asymmetric box gauges and after turning by 90 °, rolling in alternating open and closed shaped preparatory calibers, the final design of the profile, while the final shaping of the profile is carried out in the prefinishing caliber, which is a control one, which is rotated by 45 ° relative to the finishing and previous calibers with the location of the caliber connectors in the surfaces that are generators of the radius R10, coupled with the release of the caliber 8% (FIG. 2) and radius R3 ... 5 mm, conjugated with the contact surface with the rail foot, with a gap between the rolls of 5 ... 8 mm.

Due to the use of tilting in front of the pre-finishing gauge 6 (FIG. 1) and the compression of the working surface of the counter-rail angle, as well as the contact surface with the rail, the vector polarity and, as a consequence, the curl of the strip will decrease. Taking into account the tolerance for linearity of the contact surface with the neck of the rail (0,1) of FIG. 2., The use of control of the working surface and the contact surface with the rail will allow this condition to be met until a finished profile is obtained.

The analysis of the state of the art, including a search for patents and scientific and technical information and the identification of sources containing information about analogues of the claimed technical solution, made it possible to establish that the applicant did not find sources characterized by features that are identical to all essential features of the claimed invention.

Therefore, the claimed invention meets the criteria of "novelty" and "inventive step".

The essence of the invention is illustrated by drawings, which depict:

Fig. 1 is a diagram of the sequence of shaping along the cross-sectional passages of the strip when rolling the counter-rail angle when implementing the proposed method;

Fig.2 profile of the corner of the counter rail 850;

FIG. 3 is a pre-final control gauge (alleged invention).

FIG. 1 (1, 2) shows two asymmetrical open box gauges, in which the roll is prepared for its task after tilting 90 ° into an open shaped preparatory gauge. Figure 1 (3, 4) - shows shaped grooves with the same values of angles (α) and radii of curvature R at the tops of the upper streams and the same angles (β) and radii of curvature (r) on the crests of the lower grooves of calibers. Figure 1 (5, 6) shows the last two shaped gauges, which finally form the profile. The rolling of the roll is carried out at 45 ° after rolling in the fifth gauge Fig. 1 (5). Figure 1 (6) shows the prefinishing gauge, where the location of the gauge connectors is in the surfaces that are generators of the radius R10, coupled with the release of the 8% gauge (Figure 2) and the radius R3 ... 5 mm, mated with the contact surface with the rail base, with a roll gap of 5 ... 8 mm. FIG. 1 (7) shows the finishing gauge.

The original billet of rectangular cross-section is heated to a temperature of 1200-1250 ° C and rolled initially in two asymmetrical box grooves, where the future top of the profile begins to form, then rolling occurs in 2 shaped grooves Fig. 1 (3.4) with the same angles ( α) and radii of curvature R at the tops of the upper streams and the same angles (β) and radii of curvature (r) on the crests of the lower grooves of calibers, then the roll is set in 5 shaped gauge Fig. 1 (5), and after turning by 45 ° in 6 -th control pre-finishing gauge Fig. 1 (6), with the control of the edges of the working surface and the interface surface with the rail neck, subsequently, after the control is completed, the roll is transferred to the finishing caliber 7 Fig. 1 (7.).

The application of the invention will allow: to ensure the exact implementation of the geometry of the profile, to eliminate its twisting, to obtain the required radii of curvature in the places where the calibers are split; improve the stability and quality of rolled products.

Sources of information:

[1] RF patent No. 2288048 "A new method of rolling asymmetric angular profiles", MPK8 C21B1 / 09, publ. 27.11.2006, bul. No. 13;

[2] RF patent No. 2254942 "Method for rolling asymmetric angular profiles", MPK8 C21B1 / 08, publ. June 27, 2005, bull. No. 18.

Claims (1)

A method of rolling an asymmetric angular profile, mainly of a railway one, such as a counter-rail angle, including a multi-pass reduction of a heated billet in rolls with grooves, the initial formation of a profile in asymmetric box grooves and after turning by 90 °, rolling in alternating open and closed shaped preparatory grooves, the final formation of a profile, characterized in that the final shaping of the profile is carried out in a pre-finishing caliber, which is a control one, which is rotated by 45 ° relative to the finishing and previous calibers with the location of the caliber connectors in the surfaces forming the radius (R10), coupled with the release of the 8% caliber, and the radius (R3) 5 mm, conjugated with the contact surface with the rail base, with a gap between the rolls of 5-8 mm.

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