Mining metal top beam one-time hot rolling forming process
The problem of welding alignment of mining metal roof beams was solved by a one-time hot rolling forming process, realizing the manufacturing of high-strength, low-cost metal roof beams and improving safety and processing efficiency.
Patent Information
- Application Number
- CN202511090076.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-05
- Publication Date
- 2025-11-04
AI Technical Summary
The existing hollow I-beam metal roof beams used in mines are difficult to align during welding, resulting in poor welding quality, heavy weight, and difficulty in maintaining straightness. They are also prone to breaking at the joints, posing a safety hazard.
The process employs a single hot rolling process, including heating, rolling, hot bending, welding, heat treatment, cooling, straightening, and sawing. The joints are connected by high-frequency welding, and residual heat is used for heat treatment to improve overall strength and straightness.
It achieves one-time molding of high-strength, low-cost metal top beams, with low stress at the joints, making them less prone to breakage, thus improving safety and processing efficiency.
Smart Images
Figure CN120885572A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a one-time forming process of a metal roof beam, in particular to a one-time hot rolling forming process of a mining metal roof beam. BACKGROUND
[0002] The roof beam used for supporting in the mine in the prior art is a hollow I-shaped metal roof beam with a cross-sectional shape, and the roof beam in the prior art is made by butt jointing two π-shaped steels with a π-shaped cross section and then welding, and the two legs of the π-shaped steel are aligned and then welded, for example, as shown in the accompanying drawings Figure 7 , but this method has some problems, one is that it is difficult to completely align the overall legs of the two π-shaped steels during welding, the overall weight is heavy, and it is difficult to adjust, and the entire steel is long, and it is difficult to ensure that the entire steel is completely straight during processing, and it is also difficult to process the two π-shaped steels to be exactly the same, which causes deviation during welding, affecting the welding quality; two is that the junction of the two π-shaped steels is at the leg, and this is the main stress bearing point during use, which causes the welded part to be prone to disconnection during use, and once disconnected, a safety accident is likely to occur. Therefore, a one-time hot rolling forming process of a mining metal roof beam is proposed. SUMMARY
[0003] The purpose of the present application is to solve the above problems and provide a one-time hot rolling forming process of a mining metal roof beam.
[0004] In order to achieve the above purpose, the present application provides a one-time hot rolling forming process of a mining metal roof beam, characterized in that the one-time hot rolling forming process comprises the following steps: I. Heating: The continuous casting billet of a specified size is placed flat and pushed into a continuous heating furnace, and is heated to a specified temperature and then discharged from the furnace; II. Conveying: The continuous casting billet heated to a specified temperature is sent to the rolling mill through the roller way, and the continuous casting billet is rolled; III. Hot bending: The workpiece after hot rolling is hot bent and formed into a hollow I-shaped metal roof beam with the junction at the bottom by a hot bending machine; IV. Welding: The junction at the bottom is welded and connected by high-frequency welding while forming; V. Heat treatment: The workpiece after hot bending and welding is quenched and self-tempered by using the residual heat of the workpiece; VI. Cooling: After the heat treatment is completed, the workpiece is moved to a step-by-step cooling bed for cooling; VII. Straightening: After cooling, the hollow I-shaped metal roof beam is straightened as a whole by a cantilever straightening machine; VIII. Sawing: After straightening, the workpiece is sawed according to requirements.
[0005] Further preferably, when the continuous casting billet is rolled by the rolling mill: First, the continuous casting billet is rolled by the first rolling mill to complete K16, K15, K14 and K13 passes; Then, the second rolling mill is used to complete K12, K11 and K10 passes; Then, the third rolling mill is used to complete K9 pass, Finally, the fourth rolling mill is used to complete K8 pass.
[0006] Further preferably, the workpiece after the K16-K9 passes of the hot rolling process is subjected to hot bending forming by a hot bender to form a hollow I-shaped metal roof beam.
[0007] Further preferably, in the first step, the continuous casting billet is heated to 1150-1200℃ before being discharged.
[0008] Further preferably, in the third step, when the continuous casting billet is rolled, K16 is fed into the middle and lower rolling line, K15 is fed into the middle and upper rolling line, K14 is fed into the middle and lower rolling line, and K13 is fed into the middle and upper rolling line, and each pass is flat rolling without the need for turning.
[0009] Further preferably, when rolled, K12 is fed into the middle and lower rolling line, K11 is fed into the middle and upper rolling line, and K10 is fed into the middle and lower rolling line, and each pass is flat rolling without the need for turning.
[0010] Further preferably, K9 and K8 passes are continuous rolling, and the rolling speed is equal during rolling.
[0011] Further preferably, the last two passes of the hot bending process are bent by a four-roll universal mill.
[0012] Further preferably, in the fifth step, the workpiece is subjected to heat treatment when the workpiece has a residual heat of 850-920℃.
[0013] Further preferably, in the sixth step, the workpiece after heat treatment is cooled by a step-by-step cooling bed to less than 120℃.
[0014] The beneficial effects of the present application are as follows: by the process, the continuous casting billet is once formed into a hollow I-shaped metal roof beam with the joint at the middle of the bottom by hot rolling and hot bending, and the joint is welded by high-frequency welding, the once-formed roof beam has high overall strength and good pressure-bearing capacity, and the joint is arranged at the middle of the bottom, which is subjected to the smallest pressure during use, so the joint is less likely to be disconnected due to pressure, thereby improving the overall pressure-bearing capacity of the metal roof beam and improving the safety during use. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1is a hot rolling hole position schematic diagram of K16-K13 in the application; Figure 2 is a hot rolling hole position schematic diagram of K12-K10 in the application; Figure 3 is a hot rolling hole position schematic diagram of K9-K8 in the application; Figure 4 is a hot bending forming shape schematic diagram of K7-K4 in the application; Figure 5 is a hot bending forming shape schematic diagram of K3-K1 in the application; Figure 6 is a cross-sectional schematic diagram of a roof beam made by using the application; Figure 7 is a cross-sectional schematic diagram of a roof beam in the prior art described in the background of the application. DETAILED DESCRIPTION
[0016] The application will be further described below in combination with the drawings.
[0017] It should be noted that all directional indications such as upper, lower, left, right, front, back, etc. in the embodiments of the application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture such as shown in the drawings, and if the certain posture changes, the directional indications also change accordingly. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific situation.
[0018] Referring to Figures 1-6 A one-time hot rolling forming process for a mine metal roof beam, characterized in that the one-time hot rolling forming process comprises the following steps: Heating: push the continuous casting billet of a set size flat into a continuous heating furnace, and heat to 1150-1200℃ before discharging from the furnace; Conveying: convey the continuous casting billet heated to a set temperature into the first rolling mill through a roller table, and the continuous casting billet can be conveyed by a conveying roller during the production of hot rolling, hot bending, etc. Complete K16, K15, K14 and K13 passes of rolling on the continuous casting billet by the first rolling mill; K16 enters the steel at the middle lower rolling line, K15 enters the steel at the middle upper rolling line, K14 enters the steel at the middle lower rolling line, and K13 enters the steel at the middle upper rolling line, each pass is flat rolling and does not need to be turned over; Complete K12, K11 and K10 passes of rolling by the second rolling mill; K12 enters the steel at the middle lower rolling line, K11 enters the steel at the middle upper rolling line, and K10 enters the steel at the middle lower rolling line, each pass is flat rolling and does not need to be turned over; K9 pass is completed by the third rolling mill, and K8 pass is completed by the fourth rolling mill; K9 and K8 passes are continuous rolling, and the pinch speed of K9 and K8 is equal, and the pinch speed is controlled according to the equal flow principle; hot bending: the workpiece after hot rolling is formed into a rectangular tube metal roof beam with four wings and the joint at the bottom by a hot bending machine through K7, K6, K5, K4, K3, K2 and K1 passes; K2 and K1 are bent by a four-roll universal mill; welding: the joint at the middle part of the bottom of the rectangular tube metal roof beam is welded and connected by a high-frequency welding machine while K1 pass is formed; heat treatment: the workpiece after K1 pass and welding is quenched and self-tempered at 850-920 DEG C, and the heat treatment process is directly quenched and self-tempered by using the residual heat, which is lower in cost compared with special heating heat treatment, and can effectively reduce the processing cost; cooling: after the heat treatment, the workpiece is moved to a step-by-step cooling bed for cooling, and the cooling process is completed at less than 120 DEG C; straightening: after cooling, the rectangular tube metal roof beam with four wings is straightened by a cantilever straightening machine; sawing: after straightening, the workpiece is sawed by a band saw according to the size requirement to form a product with the required size.
[0019] The protection scope of the present application is not limited to the above embodiments and their transformations. The routine modifications and replacements made by the skilled in the art based on the content of the embodiments all belong to the protection scope of the present application.
Claims
1. A one-time hot rolling forming process for mining metal roof beams, characterized by: The one-step hot rolling forming process includes the following steps:
1. Heating: The continuously cast billet of the set size is placed flat and pushed into the continuous heating furnace, heated to the set temperature and then taken out of the furnace; 2. Conveying: The continuously cast billet heated to the set temperature is fed into the rolling mill through the roller conveyor and then rolled.
3. Hot bending: The hot-rolled workpiece is hot-bent into an I-shaped metal top beam with the joint at the bottom and hollow by using a hot bending machine. IV. Welding: While forming, the bottom joint is connected by high-frequency welding; V. Heat treatment: Utilize the residual heat from the workpiece after hot bending and welding to perform quenching and self-tempering heat treatment. VI. Cooling: After heat treatment, the workpiece is moved to a walking beam cooling bed for cooling.
7. Straightening: After cooling, the hollow I-shaped metal top beam is straightened as a whole using a cantilever straightening machine; 8. Sawing: After straightening is completed, the workpiece is sawed according to requirements.
2. The one-time hot rolling forming process for a mining metal roof beam according to claim 1, characterized in that: When rolling continuously cast billets through a rolling mill: First, the continuous casting billet is rolled through the first rolling mill in passes K16, K15, K14, and K13. Then, the rolling of passes K12, K11, and K10 is completed using a second rolling mill; Then, the K9 pass is rolled using a third rolling mill. Finally, the K8 pass rolling was completed using the fourth rolling mill.
3. The one-time hot rolling forming process for a mining metal roof beam according to claim 2, characterized in that: The workpiece that has completed the K16-K9 hot rolling process is hot-bent and formed into a hollow I-shaped metal top beam by using a hot bending machine.
4. The one-time hot rolling forming process for a mining metal roof beam according to claim 1, characterized in that: In the first step, the continuously cast billet is heated to 1150℃~1200℃ and then taken out of the furnace.
5. The one-time hot rolling forming process for a mining metal roof beam according to claim 2, characterized in that: In the third step, when rolling the continuously cast billet, K16 enters the steel on the lower middle rolling line, K15 enters the steel on the upper middle rolling line, K14 enters the steel on the lower middle rolling line, and K13 enters the steel on the upper middle rolling line. Each pass is a flat rolling, and there is no need to flip the steel.
6. The one-time hot rolling forming process for a mining metal roof beam according to claim 2, characterized in that: During rolling, steel is fed into the lower K12 rolling line, the upper K11 rolling line, and the lower K10 rolling line. All three passes are flat rolling, and steel does not need to be turned over.
7. The one-time hot rolling forming process for a mining metal roof beam according to claim 2, characterized in that: K9 and K8 are continuous rolling passes, with equal rolling speeds during rolling.
8. The one-time hot rolling forming process for a mining metal roof beam according to claim 3, characterized in that: The final two steps of the hot bending process are bent using a four-roll universal bending machine.
9. The one-time hot rolling forming process for a mining metal roof beam according to claim 1, characterized in that: In the fifth step, the residual heat of the workpiece during heat treatment is 850℃~920℃.
10. The one-time hot rolling forming process for a mining metal roof beam according to claim 1, characterized in that: In the sixth step, a walking beam cooling bed is used to cool the heat-treated workpiece to a temperature of less than 120°C.