Novel high-load-resistant back-up roll

Abstract

The utility model relates to the technical field of back-up rolls, and discloses a novel high-load-resistant back-up roll which comprises a roll core, a roll sleeve is sleeved on the outer side of the middle of the roll core, two water retaining rings are symmetrically arranged on two sides of the roll sleeve, the water retaining rings are sleeved on two sides of the roll core, two ball bearings are symmetrically arranged at two ends of the roll core, and the ball bearings are sleeved on the roll sleeve. The back-up roll comprises a back-up roll body, the back-up roll body is provided with a plurality of ball bearings, the ball bearings are provided with ball contact surfaces, the end portions of the outer sides of the ball bearings are provided with positioning bearings, the positioning bearings are provided with bearing contact surfaces, and the end portions of the bearing contact surfaces are provided with connecting end heads. And the composite roller core and the roller sleeve have an extremely high forging ratio, the grain structure is finer, and although the material purity of the whole roller is higher than that of the composite roller core in the heat treatment process, the whole roller is not easy to deform, namely fatigue cracks are not easy to produce, and the general service life is more than three times of that of the whole roller core.

Description

TECHNICAL FIELD

[0001] The utility model relates to support roller technical field, concretely is a novel high load resistance support roller. BACKGROUND

[0002] Increase the rigidity of work roll on the rolling mill, the roll that directly or indirectly bears the rolling load is called support roll, and the support roll is an important component in the rolling mill, which is used to support the work roll or the intermediate roll to prevent the work roll from being deformed in the bending area during rolling, thereby affecting the rolling plate shape. The quality of the support roll directly affects the yield and quality of the rolling plate. The complex and diverse working conditions of the support roll make it an important workpiece in the rolling tool. On the one hand, the support roll has to bear a lot of bending stress and friction during the rolling process. On the other hand, the roll body surface has to bear wear, impact, contact stress and fatigue caused by rapid cooling and heating for a long time. The support roll has five common damages in the use process: 1. indentation caused by uneven hardness of the roll surface; 2. sticking caused by uneven cooling of the roll surface due to broken strip; 3. cracks caused by long rolling time, cold hard layer fatigue of the roll surface and other reasons; 4. spalling caused by surface crack propagation and unground fatigue cracks; and 5. vibration marks and arc tips caused by the work roll moving without the support roll on the roll body. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides a novel high load resistance support roll, which solves the problems of the five common damages of the existing support roll in the use process: 1. indentation caused by uneven hardness of the roll surface; 2. sticking caused by uneven cooling of the roll surface due to broken strip; 3. cracks caused by long rolling time, cold hard layer fatigue of the roll surface and other reasons; 4. spalling caused by surface crack propagation and unground fatigue cracks; and 5. vibration marks and arc tips caused by the work roll moving without the support roll on the roll body.

[0004] The utility model provides the following technical scheme: a novel high load resistance support roll, which comprises a roll core, an outer side of a middle part of the roll core is sleeved with a roll sleeve, two water retaining rings are symmetrically arranged on the two sides of the roll sleeve, the water retaining rings are sleeved on the two sides of the roll core, two ball bearings are symmetrically arranged at the two ends of the roll core, the ball bearings are provided with ball contact surfaces, a positioning bearing is arranged at the outer side end of each ball bearing, a bearing contact surface is arranged on the positioning bearing, and a connecting end head is arranged at the end of the bearing contact surface.

[0005] Preferably, the diameter of the ball bearing is smaller than the diameter of the roll core.

[0006] Preferably, the diameter of the positioning bearing is smaller than the diameter of the ball bearing.

[0007] Preferably, two mounting holes are symmetrically arranged on the two sides of the connecting end head.

[0008] The scheme can make the two sides of the connecting end fixed more stably.

[0009] Preferably, the connecting end is provided with a center hole in the middle.

[0010] The scheme can make the installation of the connecting end more convenient for users.

[0011] Compared with the prior art, the novel high-load-resistant supporting roller has the following advantages:

[0012] (1) The novel high-load-resistant supporting roller has higher strength and longer service life than the traditional supporting roller, and the composite roller core and the rolling sleeve have a very high forging ratio, and the grain structure is more refined; although the purity of the material of the overall roller is higher than that of the composite roller core during heat treatment, the roller core and the working surface are integrated, and the quenching process requirements of the shaft core and the strength must be considered; if the hardness and strength are too high, the material density is too high, and the working surface is easily cracked and cracked during quenching, resulting in scrap; therefore, in order to balance, the hardness and strength of the overall roller must be reduced after quenching by increasing the tempering temperature, and the most unfavorable factor brought by the reduction is that the overall roller is affected by the rolling force during rolling and is deformed, and under the action of rapid rotation and torsion in long-term use, fatigue cracks are slowly formed at the neck of the roller, and finally the roller is broken; the composite roller core is treated separately during heat treatment, and only the strength of the shaft core needs to be considered, so it is not easy to deform and produce fatigue cracks, and the service life is more than three times that of the overall roller core.

[0013] (2) Price advantage: the overall roller generally purchases electroslag remelting medium-carbon alloy steel for forging due to the performance requirements of the working surface, and the shaft core of the composite roller focuses on strength and service life, so it generally purchases furnace refining high-carbon alloy steel, and after flaw detection, it can be forged, thereby directly saving the cost of electroslag remelting, increasing the yield, and reducing the risk, so the finished product is priced at 20 yuan / KG (including tax), and the difference between the two is about 4.5 yuan / KG.

[0014] (3) Combined with the advantages of the above two, the production cost of the user is lower. DRAWINGS

[0015] Figure 1 The structure of the utility model is shown in the overall schematic view;

[0016] Figure 2 The structure of the utility model is shown in the overall schematic view; Figure 1 The structure of the utility model is shown in the overall schematic view;

[0017] Figure 3 The structure of the utility model is shown in the overall schematic view; Figure 1The structural section schematic view of B-B;

[0018] Figure 4 The utility model discloses a Figure 1 The structural section schematic view of C-C;

[0019] Figure 5 The utility model discloses a Figure 1 The structural schematic view of K direction;

[0020] Figure 6 The utility model discloses a Figure 1 The structural schematic view of connecting end;

[0021] Figure 7 The utility model discloses a Figure 6 The structural section schematic view of connecting end.

[0022] In the drawing: 1, roller core; 2, roller sleeve; 3, water baffle; 4, ball bearing; 5, first contact surface; 6, locating bearing; 7, second contact surface; 8, connecting end. Specific implementation

[0023] Please refer to Figures 1-7 ,

[0024] Embodiment one: a novel high-load-resistant supporting roller, including roller core 1, the outer side of the middle part of roller core 1 is equipped with roller sleeve 2, two water baffles 3 are symmetrically arranged on the both sides of roller sleeve 2, water baffle 3 is equipped in the both sides of roller core 1, two ball bearings 4 are symmetrically arranged on the both ends of roller core 1, ball bearing 4 is provided with ball contact surface 5, the outer side end of ball bearing 4 is provided with locating bearing 6, locating bearing 6 is provided with bearing contact surface 7, and the end of bearing contact surface 7 is provided with connecting end 8.

[0025] The diameter of ball bearing 4 is less than the diameter of roller core 1.

[0026] Embodiment two: the difference between the embodiment and embodiment one is that the diameter of locating bearing 6 is less than the diameter of ball bearing 4.

[0027] Embodiment three: the difference between the embodiment and embodiment one is that two mounting holes are symmetrically formed on the both sides of connecting end 8.

[0028] Make the both sides of connecting end 8 more stable after mounting and fixing.

[0029] Embodiment four: the difference between the embodiment and embodiment one is that the middle part of connecting end 8 is provided with a center hole, and the center hole is conical.

[0030] Make the installation of connecting end 8 more convenient for users.

[0031] In the embodiment, the five common damages of the existing support roller in use are: 1. uneven hardness of the roller surface causes indentation; 2. uneven cooling of the roller surface caused by broken strip causes sticking of the roller; 3. cracks caused by long rolling time, hard layer fatigue of the roller surface and other reasons; 4. peeling caused by surface crack propagation and unground fatigue crack; 5. work roller belt does not move the support roller to cause the roller to shake and arc.

[0032] In summary, in the specific implementation, the support roller is composed of a roller core 1 and a roller sleeve 2, the roller core 1 is made of high-carbon steel through outside-furnace refining into a cast blank, the cast blank is forged into a cylindrical shape, and the connecting end head 8 of the roller core shaft, the positioning bearing 6, the bearing contact surface 7, the ball bearing 4 and the ball bearing contact surface 5 are machined, in order to obtain a high-strength roller core 1, the roller core 1 needs to be integrally and deeply quenched on the surface, the roller sleeve 2 is made of medium-carbon steel through electroslag remelting into a circular ring, then the workpiece is machined to the required size, and after surface quenching, the high-strength roller sleeve 2 is obtained, and the roller core 1 and the roller sleeve 2 are combined into a whole through high-temperature thermal expansion.

Claims

1. A novel support roller resistant to high loads, characterized in that: The roller core (1) is provided with a roller sleeve (2) on the outer side of the middle part of the roller core (1). Two water-blocking rings (3) are symmetrically arranged on both sides of the roller sleeve (2). The water-blocking rings (3) are sleeved on both sides of the roller core (1). Two ball bearings (4) are symmetrically arranged at both ends of the roller core (1). The ball bearings (4) are provided with ball contact surfaces (5). The outer ends of the ball bearings (4) are provided with positioning bearings (6). The positioning bearings (6) are provided with bearing contact surfaces (7). The ends of the bearing contact surfaces (7) are provided with connecting ends (8).

2. The novel high-load-resistant support roller according to claim 1, characterized in that: The diameter of the ball bearing (4) is smaller than the diameter of the roller core (1).

3. A novel high-load-resistant support roller according to claim 2, characterized in that: The diameter of the positioning bearing (6) is smaller than the diameter of the ball bearing (4).

4. A novel high-load-resistant support roller according to claim 3, characterized in that: The connecting end (8) has two symmetrical mounting holes on both sides.

5. A novel high-load-resistant support roller according to claim 4, characterized in that: The connecting end (8) has a central hole in the middle, and the central hole is conical.

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