Improved combined roller for large profile steel three-roller roughing mill frame

Abstract

The utility model relates to an improved combined roller for a large profile steel three-roller roughing mill frame, which comprises an upper roller, a middle roller and a lower roller which are sequentially arranged in parallel from top to bottom, and a first open slot, a third open slot and a fifth open slot are sequentially formed in opposite positions of the middle roller and the lower roller. A first rolling pass, a third rolling pass and a fifth rolling pass are oppositely formed among the first open slot, the third open slot and the fifth open slot; a second open groove and a fourth open groove are sequentially formed in the opposite positions of the upper roller and the middle roller, and a second rolling hole pattern and a fourth rolling hole pattern are formed between the second open groove and the fourth open groove. According to the improved combined roller for the large profile steel three-roller roughing mill frame, the working condition working environment of the roller and the tensile strength, toughness, wear resistance and hot crack resistance of the roller are considered, the material of the combined roller and the arrangement requirements of the combined hole pattern are also considered, and stable and safe use of the combined roller is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling rolls, in particular to a combined rolling roll for an improved large-section steel three-high roughing stand. Background Art

[0002] In the hot rolling production of section steel, the relative sliding and high load between the rolled piece and the rolling roll will cause wear of the rolling roll. This wear will not only affect the service life of the rolling roll, but also affect the shape size and surface quality of the rolled piece. Therefore, studying the wear of the rolling roll; mastering the accurate wear amount and surface state of the wear is beneficial to improving the automatic control level of the rolled piece, the shaping quality and surface quality of the rolled piece product. To achieve the above goals, new rolling manufacturing processes are developed to improve the performance of the rolling roll: composition, structure, and performance are the three essential elements characterizing the characteristics of the rolling roll, and none of them can be lacking, especially the roughing roll of the three-high mill unit. Its rolling operation conditions are completely different from those of the roughing roll of the two-high continuous rolling mill and the two-high reversible roughing mill. Summary of the Invention

[0003] The technical problem to be solved by the utility model is: to solve the problems existing in the above background art, a combined rolling roll for an improved large-section steel three-high roughing stand is provided, which not only considers the working condition operation environment of the rolling roll, the tensile strength, toughness, wear resistance and thermal crack resistance of the rolling roll, but also considers the material of the combined rolling roll and the requirements for the combined pass setting, so as to ensure the stable and safe use of the combined rolling roll.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an improved combined rolling roll for a large-section steel three-high roughing stand, which includes an upper rolling roll, a middle rolling roll and a lower rolling roll that are arranged in parallel from top to bottom in sequence. First opening grooves, third opening grooves and fifth opening grooves are sequentially opened at the relative positions of the middle rolling roll and the lower rolling roll. First rolling passes, third rolling passes and fifth rolling passes are formed between the first opening groove, the third opening groove and the fifth opening groove relatively; second opening grooves and fourth opening grooves are sequentially arranged at the relative positions of the upper rolling roll and the middle rolling roll, and second rolling passes and fourth rolling passes are formed between the second opening groove and the fourth opening groove relatively.

[0005] Further defined, in the above technical solution, bearing shoulders are arranged at both ends of the upper rolling roll, both ends of the middle rolling roll and both ends of the lower rolling roll.

[0006] Further defined, in the above technical solution, a plum blossom head connection drive end is arranged on one side of each of the bearing shoulders.

[0007] Further defined, in the above technical solution, the specification of the upper rolling roll is Φ760*1800mm; the specification of the middle rolling roll is Φ770*1800mm; the specification of the lower rolling roll is Φ750*1800mm.

[0008] Further limited, in the above technical solution, the first rolling pass, the second rolling pass, the third rolling pass, the fourth rolling pass, and the fifth rolling pass are arranged in sequence from left to right.

[0009] The beneficial effects of the present utility model are as follows: An improved combined roll for a three-high roughing stand of large-section steel proposed by the present utility model not only considers the working conditions of the roll, the tensile strength, toughness, wear resistance, and thermal crack resistance of the roll, but also considers the material of the combined roll and the requirements for the arrangement of the combined pass, ensuring the stable and safe use of the combined roll. Description of the Drawings

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 is a schematic structural diagram of the present utility model;

[0012] Figure 2 is Figure 1 the side structural diagram of

[0013] The reference numerals in the drawings are: 1, upper roll; 2, middle roll; 3, lower roll; 4, first opening groove; 5, third opening groove; 6, fifth opening groove; 7, first rolling pass; 8, third rolling pass; 9, fifth rolling pass; 10, second opening groove; 11, fourth opening groove; 12, second rolling pass; 13, fourth rolling pass; 14, bearing neck; 15, plum blossom head connection drive end. Detailed Embodiments

[0014] In order to make the technical problems, technical solutions, and beneficial effects solved by the present utility model more clearly understood, the following further details the present utility model with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0015] In the present application, the five sets of passes of the three-high roughing mill are square, rectangular, rectangular, diamond-shaped, and oval respectively.

[0016] See Figure 1 and Figure 2Shown is a combined roll for an improved large-section steel three-high roughing stand, including an upper roll 1, a middle roll 2, and a lower roll 3 that are arranged in parallel from top to bottom in sequence. First opening grooves 4, third opening grooves 5, and fifth opening grooves 6 are successively formed at opposite positions on the middle roll 2 and the lower roll 3. First rolling passes 7, third rolling passes 8, and fifth rolling passes 9 are formed between the first opening grooves 4, third opening grooves 5, and fifth opening grooves 6 that face each other; second opening grooves 10 and fourth opening grooves 11 are successively arranged at opposite positions on the upper roll 1 and the middle roll 2. Second rolling passes 12 and fourth rolling passes 13 are formed between the second opening grooves 10 and fourth opening grooves 11 that face each other.

[0017] Among them, bearing shoulders 14 are arranged at both ends of the upper roll 1, both ends of the middle roll 2, and both ends of the lower roll 3. Plum blossom head connection drive ends 15 are arranged on one side of the bearing shoulders 14. The specification of the upper roll 1 is Φ760*1800mm; the specification of the middle roll 2 is Φ770*1800mm; the specification of the lower roll 3 is Φ750*1800mm. The first rolling pass 7, the second rolling pass 12, the third rolling pass 8, the fourth rolling pass 13, and the fifth rolling pass 9 are arranged in sequence from left to right.

[0018] The setting requirements for the combined roll of the improved large-section steel three-high roughing stand in this application are as follows: 1. The rolling mill is a Φ750 three-high roughing mill set. The rolls are arranged in the upper, middle, and lower positions on the stand. Five sets of passes are arranged between the three rolls as required. The roll specifications are as follows: the specification of the upper roll 1 is Φ760*1800mm; the specification of the middle roll 2 is Φ770*1800mm; the specification of the lower roll 3 is Φ750*1800mm. 2. The roll material is AD150+Nb alloy semi-steel. The surface hardness of the roll is 55-65HSD. The hardness drop from the roll surface to the roll bottom is ≤2HSD. The tensile strength of the roll is ≥680HSD. The basic microstructure of the roll metallography: granular carbide + tempered sorbite + bainite; 3. The roll heat treatment process: diffusion annealing, spheroidizing treatment, normalizing, spray quenching, tempering; 4. Five sets are arranged for the three-high roughing mill set according to the rolling process. The R at the R position of the five sets of pass diagrams of the upper, middle, and lower rolls is 5mm.

[0019] The working principle of the improved large-section steel three-high roughing stand is as follows:

[0020] First, in the actual rolling process, the rolled piece blank is 180*180mm. After being heated to 1050-1100°C in the reheating furnace, it is pushed into the guide rolls by the pusher. After reaching the guide rail, it enters the first rolling pass 7. After rolling, the blank is lifted by the lifting table to the second rolling pass 12 set between the middle roll 2 and the upper roll 1 for rolling, and then reciprocates to the third rolling pass 8, the fourth rolling pass 13, and the fifth rolling pass 9 as required. Then the rolled piece directly enters the post-middle rolling mill set, and the finishing mill set rolls it into the required specifications or finished profiles.

[0021] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. An improved combined rolling mill for a three-roller rough rolling mill stand for large-sized steel sections, characterized in that: It comprises an upper roller, a middle roller and a lower roller which are arranged in parallel from top to bottom, wherein the middle roller and the lower roller are provided with a first opening groove, a third opening groove and a fifth opening groove in sequence at positions opposite to each other, and the first opening groove, the third opening groove and the fifth opening groove form a first rolling pass profile, a third rolling pass profile and a fifth rolling pass profile relative to each other; the upper roller and the middle roller are provided with a second opening groove and a fourth opening groove in sequence at positions opposite to each other, and the second opening groove and the fourth opening groove form a second rolling pass profile and a fourth rolling pass profile relative to each other.

2. The improved combined rolling mill for three-roller rough rolling mill of large-sized steel according to claim 1, characterized in that: The two ends of the upper roller, the two ends of the middle roller and the two ends of the lower roller are all provided with bearing stops.

3. The improved combined rolling mill for three-roller roughing mill of large-sized steel according to claim 2, characterized in that: A plum blossom head is arranged on one side of the bearing stop to connect the transmission end.

4. The improved combined rolling mill for three-roller roughing mill of large-sized steel according to claim 1, characterized in that: The specification of the upper rolling roller is Φ760*1800mm; the specification of the middle rolling roller is Φ770*1800mm; the specification of the lower rolling roller is Φ750*1800mm.

5. The improved combined rolling mill for three-roller roughing mill of large-sized steel according to claim 1, characterized in that: The first rolling pass profile, the second rolling pass profile, the third rolling pass profile, the fourth rolling pass profile and the fifth rolling pass profile are arranged in sequence from left to right.

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