A bar mill pass and a bar mill roll changing procedure thereof

Abstract

The application discloses a bar mill pass and a bar mill roll changing step thereof, and relates to the technical field of bar mill passes. The bar mill pass and the bar mill roll changing step thereof, the bar mill pass comprises five passes, K5, K4, K3, K2 and K1, and the roll body diameter is 1100 mm. The K5 pass is characterized in that the groove opening is 380-400 mm, the groove bottom is 350-360 mm, the pass R angle is 23-27 mm, the r angle is 23-27 mm, the side wall slope is 14-16 DEG, and the groove height is 145-155 mm. The K4 pass is characterized in that the groove opening is 330-340 mm, the groove bottom is 295-305 mm, the pass R angle is 23-27 mm, the r angle is 23-27 mm, the side wall slope is 13-15 DEG, and the groove height is 145-155 mm. The K3 pass is characterized in that the groove opening is 270-280 mm, the groove bottom is 235-245 mm, the pass R angle is 28-32 mm, the r angle is 23-27 mm, the side wall slope is 12-14 DEG, and the groove height is 165-175 mm. The K2 pass is characterized in that the groove opening is 225-235 mm, the groove bottom is 195-200 mm, the pass R angle is 28-32 mm, the r angle is 23-27 mm, the side wall slope is 12-14 DEG, and the groove height is 165-175 mm. The K1 pass is characterized in that the groove opening is 200-210 mm, the groove bottom is 165-175 mm, the pass R angle is 28-32 mm, the r angle is 23-27 mm, the side wall slope is 12-14 DEG, and the groove height is 165-175 mm.

Description

Technical Field

[0001] This invention relates to the field of billet mill pass technology, and particularly to a billet mill pass for bar stock and the billet mill roll changing procedure. Background Technology

[0002] The main function of a billet mill is to reciprocate and roll the billet heated in the furnace into intermediate billets of a certain size for use by the continuous rolling mill. During the rolling process, the billet mill can automatically adjust the reduction according to pre-set tool parameters and rolling programs to achieve the desired rolling effect. However, billet mills also have some disadvantages, such as low output, low yield, a large number of operators, and relatively outdated technology. Therefore, it is necessary to design and develop a billet mill pass system for bar stock that can test various billet cross-sections and improve the output of the billet mill.

[0003] Patent publication number CN218340652U discloses a rolling mill pass system for rolling various cross-section billets using a single roll. The roll has three passes: roll pass four, roll pass three, and roll pass two. This rolling mill pass system for rolling φ60~φ250mm round steel using a single roll system reduces the width of roll pass three and the width of the roller rings in the middle passes, and increases the number of passes from three to four, thereby reducing roll change time. It enables the production of Φ60-Φ250mm round steel from billets with cross-sections of 240×240mm, 280×380mm, 320×415mm, and Φ200-Φ350mm, as well as large-diameter electrode flat steel of 140-200×170-240mm. However, this roll pass system only has four sets of passes, which limits the cross-sectional area of ​​the billet that can be rolled, and the chance of abnormal wear of the rolling groove of the billet mill is high. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a billet mill roll profile for bar stock and a billet mill roll changing step thereof, which can solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a blanking mill die for bar stock, comprising five die types: K5, K4, K3, K2, and K1, with a roller body diameter of 1100 mm;

[0006] The K5 groove has a diameter of 380-400mm, a bottom diameter of 350-360mm, a hole radius of 23-27mm, a r-angle of 23-27mm, a sidewall slope of 14-16°, and a groove height of 145-155mm.

[0007] The K4 slot has a diameter of 330-340mm, a bottom diameter of 295-305mm, a hole radius of 23-27mm, a r-angle of 23-27mm, a sidewall slope of 13-15°, and a slot height of 145-155mm.

[0008] The K3 groove has a diameter of 270-280mm, a bottom diameter of 235-245mm, a hole radius of 28-32mm, a radius of 23-27mm, a sidewall slope of 12-14°, and a groove height of 165-175mm.

[0009] The K2 slot has a diameter of 225-235mm, a bottom diameter of 195-200mm, a hole radius of 28-32mm, a r-angle of 23-27mm, a sidewall slope of 12-14°, and a slot height of 165-175mm.

[0010] The K1 groove has a diameter of 200-210mm, a bottom diameter of 165-175mm, a hole radius of 28-32mm, a radius of 23-27mm, a sidewall slope of 12-14°, and a groove height of 165-175mm.

[0011] The roll changing procedure for the billet mill includes the following steps: S1. Preparations before roll changing: Safety preparations: Ensure the billet mill has been stopped and the power supply has been disconnected. Hang a warning sign that reads "Do not turn on the switch, people are working." Operators should wear personal protective equipment such as safety helmets, work clothes, gloves, and safety shoes.

[0012] Prepare the necessary tools for changing the roller, such as wrenches, jacks, lifting tools, and pry bars, and check the integrity and reliability of the tools.

[0013] New roll preparation involves hoisting the new roll to the vicinity of the roll changing site, checking the surface quality, dimensional accuracy, and roll number of the roll to ensure that the roll meets production requirements.

[0014] S2 Remove the old rolls, loosen the lock nuts and connecting bolts on the roll shaft head, and use a suitable wrench to gradually loosen the lock nuts and connecting bolts on the roll shaft head in a diagonal sequence. Be careful to keep the removed nuts and bolts.

[0015] Eject the roll by placing jacks under the shaft ends at both ends of the roll and slowly raising the jacks simultaneously to push the roll out of the frame a certain distance, so that the roll is separated from the frame.

[0016] Use lifting equipment to hoist the old rolls and transport them smoothly to the designated storage location.

[0017] S3 Install the new roll. Hoist the new roll to the top of the frame using a hoisting device. Slowly lower it so that the shaft ends of the roll are aligned with the mounting holes on the frame. Insert the roll and slowly lower it into the frame, ensuring that the roll is installed in the correct position. Tighten the connecting bolts and lock nuts. Use a wrench to tighten the connecting bolts and lock nuts of the roll shaft ends in a diagonal sequence. The tightening torque should meet the technical requirements of the equipment.

[0018] Inspection and debugging after S4 roll change: Check the roll installation, including its position, levelness, and verticality, ensuring it is securely installed without any looseness. Check the lubrication system to ensure the oil passages are clear and the lubricating grease is sufficient. Debug the rolls, connect the power supply, start the billet mill, and perform no-load testing to check the roll operation for any abnormal sounds, vibrations, or overheating. After the no-load testing is normal, conduct a load test production to check the dimensional accuracy, surface quality, and production efficiency of the rolled material, ensuring the billet mill can operate normally after the roll change.

[0019] S5 Clean up the site, remove tools and debris, clean up the tools and debris used in the roll changing process, sort and store them, clean up oil stains, and keep the site environment clean.

[0020] Preferably, the distance between the K5-K1 holes is 53mm.

[0021] Preferably, K1 is 100mm from the roller head and K5 is 100mm from the roller bottom.

[0022] Preferably, the upper roller has a diameter of 1100-1102 mm and the lower roller has a diameter of 1096-1098 mm.

[0023] Preferably, the groove size design is as follows: from K5 to K1, the size of the groove opening and the groove bottom gradually decreases to accommodate the gradual compression of the bar during the rolling process.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The billet rolling mill pass for this bar stock has the following advantages: high efficiency: through precise pass size and spacing design, this pass system can achieve efficient bar stock rolling and improve production efficiency;

[0026] Stability: The reasonable roll pass design makes the rolling process more stable, reducing possible faults and problems during the rolling process. The design of the upper and lower roll diameters ensures the strength and life of the rolls, further enhancing the stability of the rolling process.

[0027] Product quality: By optimizing the die design, this die system can produce bar products with accurate dimensions and good surface quality;

[0028] Flexibility: This roll pass system is suitable for rolling bars of various specifications and materials, offering high flexibility;

[0029] Economic efficiency: By improving production efficiency and product quality, this pass system can reduce production costs and increase economic benefits. In summary, this bar mill pass system, through precise design and optimization, possesses advantages in high efficiency, stability, product quality, flexibility, and economy, and can meet the needs of bar rolling.

[0030] 2. The billet roll changing step has the following advantages and high safety: before changing rolls, ensure that the machine is stopped, the power is cut off and warning signs are set up, and the operators wear personal protective equipment. Safety measures are emphasized throughout the process, which can effectively reduce the risk of safety accidents.

[0031] Adequate preparation: Before changing rolls, make full preparations for safety, tools and new rolls to make the roll changing process more efficient and orderly, and reduce delays and errors caused by insufficient preparation;

[0032] The steps are clearly defined: the roll changing process is divided into steps such as disassembling the old roll, installing the new roll, inspection and debugging after the roll change, and cleaning up the site. Each step has a clear operation procedure and sequence, which is easy for operators to understand and execute, and helps to improve the quality and efficiency of roll changing work.

[0033] 3. The roll changing procedure for this bar stock using the billet mill ensures quality: the inspection and debugging process after roll changing can promptly identify problems in roll installation and equipment operation, ensuring that the rolls are installed in place and the equipment operates normally, thereby guaranteeing the dimensional accuracy, surface quality, and production efficiency of the rolled stock;

[0034] Cleanliness of the environment: The plan emphasizes the cleanup process, which helps maintain a clean working environment, reduces the adverse effects of debris and oil on equipment and work areas, and is also conducive to subsequent work and equipment maintenance. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0036] Figure 1 This is a schematic diagram of the K1-K5 hole types of the present invention; Detailed Implementation

[0037] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, and right, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0039] In the description of this invention, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0040] In the description of this invention, unless otherwise explicitly defined, the terms "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0041] Please see Figure 1 The present invention provides a technical solution: a blanking mill die for bar stock with a roller body diameter of 1100mm, including five die types: K5, K4, K3, K2, and K1;

[0042] The K5 slot opening is 380-400mm, the slot bottom is 350-360mm, the hole radius (R) is 23-27mm, the r angle is 23-27mm, the sidewall slope is 14-16°, and the slot height is 145-155mm.

[0043] The K4 slot opening is 330-340mm, the slot bottom is 295-305mm, the hole radius (R) is 23-27mm, the r angle is 23-27mm, the sidewall slope is 13-15°, and the slot height is 145-155mm.

[0044] The K3 slot opening is 270-280mm, the slot bottom is 235-245mm, the hole radius (R) is 28-32mm, the radius (r) is 23-27mm, the sidewall slope is 12-14°, and the slot height is 165-175mm.

[0045] The K2 slot opening is 225-235mm, the slot bottom is 195-200mm, the hole radius (R) is 28-32mm, the r angle is 23-27mm, the sidewall slope is 12-14°, and the slot height is 165-175mm.

[0046] The K1 slot opening is 200-210mm, the slot bottom is 165-175mm, the hole R angle is 28-32mm, the r angle is 23-27mm, the side wall slope is 12-14°, and the slot height is 165-175mm.

[0047] The distance between the K5 and K1 holes is 53mm.

[0048] K1 is 100mm from the roller head, and K5 is 100mm from the roller bottom;

[0049] In this system, the upper roller has a diameter of 1100-1102mm and the lower roller has a diameter of 1096-1098mm.

[0050] Furthermore, the groove size design: from K5 to K1, the size of the groove opening and bottom gradually decreases to accommodate the gradual compression of the bar during the rolling process;

[0051] The design of the pass R angle and r angle takes into account the flow and deformation of metal during the rolling process, ensuring the stability of the rolling process and product quality;

[0052] The design of the sidewall slope and groove height takes into account rolling force and rolling efficiency, ensuring high efficiency and stability of the rolling process;

[0053] Pass spacing design: The distance between passes K5 and K1 is 53mm. This design is beneficial for the manufacturing and installation of rolls, while ensuring the continuity and stability of the rolling process.

[0054] The distance between K1 and the roll head is 100mm, and the distance between K5 and the roll bottom is 100mm. This design takes into account the overall structure of the roll and the needs of the rolling process.

[0055] Roll diameter design: upper roll diameter 1100-1102mm, lower roll diameter 1096-1098mm. This design takes into account the stress conditions during the rolling process and the life of the rolls, ensuring the stability of the rolling process and the durability of the rolls.

[0056] Furthermore, this solution offers the following advantages: high efficiency: through precise die size and spacing design, this die system can achieve efficient bar rolling, improving production efficiency;

[0057] Stability: The reasonable roll pass design makes the rolling process more stable, reducing possible faults and problems during the rolling process. The design of the upper and lower roll diameters ensures the strength and life of the rolls, further enhancing the stability of the rolling process.

[0058] Product quality: By optimizing the die design, this die system can produce bar products with accurate dimensions and good surface quality;

[0059] Flexibility: This roll pass system is suitable for rolling bars of various specifications and materials, offering high flexibility;

[0060] Economic efficiency: By improving production efficiency and product quality, this pass system can reduce production costs and increase economic benefits. In summary, this bar mill pass system, through precise design and optimization, possesses advantages in high efficiency, stability, product quality, flexibility, and economy, and can meet the needs of bar rolling.

[0061] Furthermore, a roll changing procedure for a billet mill includes the following steps: S1. Preparations before roll changing: Safety preparations include ensuring that the billet mill has been stopped and the power supply has been cut off, hanging a warning sign that reads "Do not turn on the switch, people are working", and ensuring that the workers wear personal protective equipment such as safety helmets, work clothes, gloves, and safety shoes.

[0062] Prepare the necessary tools for changing the roller, such as wrenches, jacks, lifting tools, and pry bars, and check the integrity and reliability of the tools.

[0063] New roll preparation involves hoisting the new roll to the vicinity of the roll changing site, checking the surface quality, dimensional accuracy, and roll number of the roll to ensure that the roll meets production requirements.

[0064] S2 Remove the old rolls, loosen the lock nuts and connecting bolts on the roll shaft head, and use a suitable wrench to gradually loosen the lock nuts and connecting bolts on the roll shaft head in a diagonal sequence. Be careful to keep the removed nuts and bolts.

[0065] Eject the roll by placing jacks under the shaft ends at both ends of the roll and slowly raising the jacks simultaneously to push the roll out of the frame a certain distance, so that the roll is separated from the frame.

[0066] Use lifting equipment to hoist the old rolls and transport them smoothly to the designated storage location.

[0067] S3 Install the new roll. Hoist the new roll to the top of the frame using a hoisting device. Slowly lower it so that the shaft ends of the roll are aligned with the mounting holes on the frame. Insert the roll and slowly lower it into the frame, ensuring that the roll is installed in the correct position. Tighten the connecting bolts and lock nuts. Use a wrench to tighten the connecting bolts and lock nuts of the roll shaft ends in a diagonal sequence. The tightening torque should meet the technical requirements of the equipment.

[0068] Inspection and debugging after S4 roll change: Check the roll installation, including its position, levelness, and verticality, ensuring it is securely installed without any looseness. Check the lubrication system to ensure the oil passages are clear and the lubricating grease is sufficient. Debug the rolls, connect the power supply, start the billet mill, and perform no-load testing to check the roll operation for any abnormal sounds, vibrations, or overheating. After the no-load testing is normal, conduct a load test production to check the dimensional accuracy, surface quality, and production efficiency of the rolled material, ensuring the billet mill can operate normally after the roll change.

[0069] S5 Clean up the site, remove tools and debris, clean up the tools and debris used in the roll changing process, sort and store them, clean up oil stains, and keep the site environment clean.

[0070] Furthermore, this step has the following advantages: high safety. Before changing the roll, ensure that the machine is stopped, the power is cut off, and warning signs are set up. Operators wear personal protective equipment. Safety measures are emphasized throughout the process, which can effectively reduce the risk of safety accidents.

[0071] Thorough preparation: Before changing rolls, make full preparations for safety, tools and new rolls to make the roll changing process more efficient and orderly, and reduce delays and errors caused by insufficient preparation.

[0072] The steps are clearly defined: the roll changing process is divided into steps such as disassembling the old roll, installing the new roll, inspection and debugging after the roll change, and cleaning up the site. Each step has a clear operation procedure and sequence, which is easy for operators to understand and execute, and helps to improve the quality and efficiency of roll changing work.

[0073] Quality Assurance: The inspection and debugging process after roll replacement can promptly identify problems in roll installation and equipment operation, ensuring that the rolls are installed properly and the equipment operates normally, thereby guaranteeing the dimensional accuracy, surface quality, and production efficiency of the rolled material.

[0074] Cleanliness of the environment: The plan emphasizes the cleanup process, which helps maintain a clean working environment, reduces the adverse effects of debris and oil on equipment and work areas, and is also conducive to subsequent work and equipment maintenance.

[0075] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A blanking mill profile for bar stock, characterized in that: It includes five types of perforations: K5, K4, K3, K2, and K1, with a roller diameter of 1100mm; The K5 groove has a diameter of 380-400mm, a bottom diameter of 350-360mm, a hole radius of 23-27mm, a r-angle of 23-27mm, a sidewall slope of 14-16°, and a groove height of 145-155mm. The K4 slot has a diameter of 330-340mm, a bottom diameter of 295-305mm, a hole radius of 23-27mm, a r-angle of 23-27mm, a sidewall slope of 13-15°, and a slot height of 145-155mm. The K3 groove has a diameter of 270-280mm, a bottom diameter of 235-245mm, a hole radius of 28-32mm, a radius of 23-27mm, a sidewall slope of 12-14°, and a groove height of 165-175mm. The K2 slot has a diameter of 225-235mm, a bottom diameter of 195-200mm, a hole radius of 28-32mm, a r-angle of 23-27mm, a sidewall slope of 12-14°, and a slot height of 165-175mm. The K1 groove has a diameter of 200-210mm, a bottom diameter of 165-175mm, a hole radius of 28-32mm, a radius of 23-27mm, a sidewall slope of 12-14°, and a groove height of 165-175mm. The roll changing procedure for the billet mill includes the following steps: S1. Preparations before roll changing: Safety preparations: Ensure the billet mill has been stopped and the power supply has been disconnected. Hang a warning sign that reads "Do not turn on the switch, people are working." Operators should wear personal protective equipment such as safety helmets, work clothes, gloves, and safety shoes. Prepare the necessary tools for changing the roller, such as wrenches, jacks, lifting tools, and pry bars, and check the integrity and reliability of the tools. New roll preparation involves hoisting the new roll to the vicinity of the roll changing site, checking the surface quality, dimensional accuracy, and roll number of the roll to ensure that the roll meets production requirements. S2 Remove the old rolls, loosen the lock nuts and connecting bolts on the roll shaft head, and use a suitable wrench to gradually loosen the lock nuts and connecting bolts on the roll shaft head in a diagonal sequence. Be careful to keep the removed nuts and bolts. Eject the roll by placing jacks under the shaft ends at both ends of the roll and slowly raising the jacks simultaneously to push the roll out of the frame a certain distance, so that the roll is separated from the frame. Use lifting equipment to hoist the old rolls and transport them smoothly to the designated storage location. S3 Install the new roll. Hoist the new roll to the top of the frame using a hoisting device. Slowly lower it so that the shaft ends of the roll are aligned with the mounting holes on the frame. Insert the roll and slowly lower it into the frame, ensuring that the roll is installed in the correct position. Tighten the connecting bolts and lock nuts. Use a wrench to tighten the connecting bolts and lock nuts of the roll shaft ends in a diagonal sequence. The tightening torque should meet the technical requirements of the equipment. Inspection and debugging after S4 roll change: Check the roll installation, including its position, levelness, and verticality, ensuring it is securely installed without any looseness. Check the lubrication system to ensure the oil passages are clear and the lubricating grease is sufficient. Debug the rolls, connect the power supply, start the billet mill, and perform no-load testing to check the roll operation for any abnormal sounds, vibrations, or overheating. After the no-load testing is normal, conduct a load test production to check the dimensional accuracy, surface quality, and production efficiency of the rolled material, ensuring the billet mill can operate normally after the roll change. S5 Clean up the site, remove tools and debris, clean up the tools and debris used in the roll changing process, sort and store them, clean up oil stains, and keep the site environment clean.

2. The blanking mill profile for bar stock according to claim 1, characterized in that: The distance between the K5-K1 holes is 53mm.

3. The blanking mill profile for bar stock according to claim 1, characterized in that: K1 is 100mm from the roller head and K5 is 100mm from the roller bottom.

4. The blanking mill profile for bar stock according to claim 1, characterized in that: The upper roller has a diameter of 1100-1102mm, and the lower roller has a diameter of 1096-1098mm.

5. The blanking mill profile for bar stock according to claim 1, characterized in that: Pass size design: From K5 to K1, the dimensions of the slot opening and bottom gradually decrease to accommodate the gradual compression of the bar during the rolling process.

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