CN112828055A - Manufacturing process of steckel mill steering roller - Google Patents
Manufacturing process of steckel mill steering roller Download PDFInfo
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- CN112828055A CN112828055A CN202011627183.1A CN202011627183A CN112828055A CN 112828055 A CN112828055 A CN 112828055A CN 202011627183 A CN202011627183 A CN 202011627183A CN 112828055 A CN112828055 A CN 112828055A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 103
- 238000004891 communication Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000005242 forging Methods 0.000 claims abstract description 15
- 230000007547 defect Effects 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 238000003754 machining Methods 0.000 claims abstract description 6
- 239000000498 cooling water Substances 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003779 heat-resistant material Substances 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 33
- 239000010959 steel Substances 0.000 abstract description 33
- 238000005336 cracking Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000002347 injection Methods 0.000 description 18
- 239000007924 injection Substances 0.000 description 18
- 238000005096 rolling process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/18—Switches for directing work in metal-rolling mills or trains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a manufacturing process of a steckel mill steering roller, which is characterized by comprising a roller body, a first shaft head and a second shaft head, wherein a cooling inner cavity is arranged in the roller body in a penetrating manner along the axial direction of the roller body; the roller body is made of Q345-B material, and a cooling inner cavity is processed and manufactured by a boring machine; the first shaft head and the second shaft head are forged by Q345-B material, and the forging ratio is 4: 1; the first cooling communication hole and the second cooling communication hole are manufactured by adopting a deep hole machining process; the first shaft head and the second shaft head are respectively welded with two ends of the roller body by adopting an embedded fixed structure; the invention has the advantages of greatly improving the performance and the cooling effect of the roller body, prolonging the service life of the roller by more than one time, greatly improving the cracking defect of the roller body and improving the quality of steel coils.
Description
Technical Field
The invention belongs to the technical field of metallurgical equipment, and particularly relates to a manufacturing process of a steckel mill turning roll.
Background
On a steel rolling production line, a steckel mill is provided with a steering roller due to the limitation and the requirement of the process design, because after a steel strip enters a coil furnace and a winding drum and a pinch roller of the mill start to operate, the steel strip can be tensioned and lifted, so that the steel strip contacts the steering roller, and the direction of the steel strip is changed, so that the steckel mill is named. The deflecting roller is generally installed below the inlet side of the winding furnace, and the main function of the deflecting roller is that when the diameter of the coiled strip of the winding drum is increased, the defects on the surface of the strip steel caused by the contact of the enlarged strip coil strip steel with the furnace mouth of the coil furnace are prevented, in addition, a strip coil buffer system is formed by a rolling mill pinch roll, a guide plate and a steering roll group, the strip coil buffer system can effectively reduce the vibration generated on the strip coil by impact vibration during the strip coil coiling, therefore, the turning roll plays an important role in rolling, is a key device which is contacted with the strip steel for a long time in the rolling process of the furnace coil, the installation position is relatively narrow and crowded, and the working environment is high temperature, high vibration and large impact, the working condition is poor, the deformation or unbalance of the steel can cause serious vibration, and the phenomenon of surface crack and the like can occur when the internal cooling is poor, so that the quality problem of the strip steel is caused, and the quality defect of the strip steel is caused; and because the temperature of the furnace mouth is extremely high, the operation is extremely inconvenient when the steering roller is replaced, the downtime of the steckel mill is long, and the rolling production efficiency is seriously influenced. The internal cooling performance of the steering roller is an important factor for prolonging the service life of the steering roller and ensuring the quality of the strip steel. The cooling of the steering roller is generally that a cooling hole is axially arranged in the steering roller, one end of the steering roller is provided with a rotary joint for cooling, a cooling water inlet is arranged on the rotary joint for cooling, the cooling water inlet is communicated with a cooling water injection pipe, the cooling water injection pipe is arranged in the cooling hole in a penetrating way, and the cooling water flows into an annular space between the cooling hole and the cooling water injection pipe from an opening at the free end of the cooling water injection pipe; and a cooling water outlet is also formed in the rotary joint for cooling, the annular space between the cooling hole and the cooling water injection pipe is communicated with the cooling water outlet, and water after cooling the steering roller flows out of the steering roller through the cooling water outlet to finish cooling circulation in the steering roller. The initially designed steering roller is of an integral forging type structure, the roller body is made of 45# steel, the outer surface of the initially designed steering roller is welded by adopting a heat-resistant material SP3 surfacing process, due to the structural limitation of integral forging, the wall thickness of the steering roller is large, and the diameter of cooling holes in the steering roller is generally small, so that the flow rate of cooling water is small, the cooling area in the steering roller is small, the internal cooling is poor, surface cracks of the steering roller are further caused, the service life of the steering roller is influenced, and quality defects of strip steel can be caused.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems that the steering roller in the prior art is of an integral forging structure, the roller body is made of 45# steel, the outer surface of the steering roller is welded by adopting a heat-resistant material SP3 surfacing welding process, the wall thickness of the steering roller is large due to the structural limitation of integral forging, the diameter of a cooling hole in the steering roller is generally small, the flow of cooling water is small, the cooling area in the steering roller is small, the internal cooling is poor, the surface crack of the steering roller is further caused, the service life of the steering roller is influenced, the quality defect of strip steel is caused and the like, the invention aims to provide a manufacturing process of the steering roller of a furnace coil mill, the structure and the material of the steering roller are designed, the forming process is improved, the body performance and the cooling effect of the steering roller are greatly improved, the service life of the steering roller is prolonged by more than one time, the cracking defect of the roller body is greatly, not only the economy is greatly improved, but also the working intensity of field equipment personnel exchange operation is lightened.
2. Technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme:
the manufacturing process of the steckel mill turning roll is characterized by comprising a roll body, a first shaft head and a second shaft head, wherein the first shaft head and the second shaft head are fixedly arranged at two ends of the roll body respectively; the roller body is made of Q345-B materials, the cooling inner cavity is machined and manufactured by a boring machine, the diameter of the roller body is 400mm, the diameter of the cooling inner cavity is 300mm, the deviation of the wall thickness of the roller body is less than or equal to 0.03mm, the roughness Ra of the inner wall of the roller body is less than or equal to 0.8, and eddy current flaw detection is adopted after the machining of the cooling inner cavity is finished;
the first shaft head and the second shaft head are forged by adopting a Q345-B material, the forging ratio is 4: 1, and 100% UT flaw detection is carried out on the first shaft head and the second shaft head after the forging is finished, so that no quality defect is caused in the first shaft head and the second shaft head; the diameters of the first cooling communication hole and the second cooling communication hole are 50mm, and the first cooling communication hole and the second cooling communication hole are manufactured by adopting a deep hole machining process; the first shaft head and the second shaft head are respectively welded with two ends of the roller body by adopting an embedded fixed structure;
the roller body is bottomed by argon arc welding when being fixedly welded with the first shaft head and the second shaft head in an embedded and inserted manner, and X-ray shooting detection is carried out on a welding seam after welding is finished;
after the X-ray shooting detection is finished, a dynamic balance test is carried out, when the rotating speed of the steering roller reaches 680rpm, the dynamic balance grade reaches the G1.6 standard, and the maximum bearing tension is 500KN under the conditions of 950 plus 1100 ℃.
In a specific embodiment of the invention, the Q345-B comprises the following components in percentage by mass: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, 1.00-1.60 percent of Mn1.02-0.15 percent of V, 0.015-0.06 percent of Nb0.02-0.2 percent of Ti, 0.04 percent of S, less than or equal to 0.04 percent of P, and the balance of iron and other inevitable impurities.
In a specific embodiment of the invention, a first taper hole gradually expanding from the first spindle head to the roll body is arranged between the first cooling communication hole and the cooling inner cavity, and a second taper hole gradually expanding from the second spindle head to the roll body is arranged between the second cooling communication hole and the cooling inner cavity.
In a specific embodiment of the invention, a first step part for sleeving the first shaft head is arranged on the outer wall of one end of the roller body close to the first shaft head, the end surface of the first shaft head abuts against the first step part, and a first groove is arranged on the end surface of the first shaft head and the first step part; the outer wall of the roller body, close to one end of the second shaft head, is provided with a second step portion used for being sleeved with the second shaft head, the end face of the second shaft head abuts against the second step portion, and a second groove is formed in the end face of the second shaft head and the second step portion.
In a specific embodiment of the invention, a first frustum with the diameter gradually increasing from the first shaft head to the roller body is arranged on the outer wall of one end, close to the roller body, of the first shaft head, and a second frustum with the diameter gradually increasing from the second shaft head to the roller body is arranged on the outer wall of one end, close to the roller body, of the second shaft head.
In a specific embodiment of the present invention, a cooling rotary joint is inserted into the first spindle head, a cooling water inlet is provided on the cooling rotary joint, the cooling water inlet is communicated with a cooling water injection pipe, the cooling water injection pipe is inserted through the first cooling communication hole and the cooling inner cavity, and a free end of the cooling water injection pipe extends into the second cooling communication hole, a first annular space is formed between the cooling water injection pipe and the first cooling communication hole, a second annular space is formed between the cooling water injection pipe and the second cooling communication hole, an inner cavity annular space is formed between the cooling water injection pipe and the cooling inner cavity, the cooling rotary joint is further provided with a cooling water outlet, and the second annular space is communicated with the cooling water outlet.
In a specific embodiment of the invention, the outer wall of the roller body is provided with a surfacing layer; the surfacing layer is welded by adopting a heat-resistant material SP3 surfacing process, the thickness of the surfacing layer is 7.5mm, and the surface hardness reaches HRC68 +/-2.
The roller body, the first shaft head and the second shaft head are made of Q345-B materials according to the invention for the following reasons:
Q345-B belongs to low-alloy high-strength structural steel, the comprehensive mechanical property and the cold and hot processing performance are good, the V and Nb elements in the steel improve the welding performance of the steel, so that the technological feasibility of the welding assembly forming of the steering roller is realized, including the welding between the shaft head and the roller body, a large number of welding defects caused by poor welding performance of matrix materials are avoided, the welding seam quality is ensured, and the possibility of heating, fault and shutdown caused by welding problems in the use process of the steering roller is reduced.
Secondly, the low alloy structural steel has good corrosion resistance and is not easy to deform or crack. As seen from the element content, in the Q345-B material, Si is used as a quenching and tempering alloy element, the heavy load bearing capacity of the steel is improved, and Ti can enable the steel grade to have good mechanical property and technological property. In view of the working environment of the roller at the production site, the characteristics of deformation and cracking resistance are also the most important improvement factor for selecting the steel grade in order to prevent cracks and large impact load caused by water quenching.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that: the steckel mill steering roll provided by the invention mainly aims at the problems that the steering roll in the steckel mill has short service life and easy cracking of a roll surface due to high temperature, high load and other field severe factors, the performance of various materials is compared and researched from the material and the structure of the roll, the poor cooling of the roll body is improved, the design is carried out from the aspects of the material, the cooling holes and the roll forming process, the performance and the cooling effect of the roll body are greatly improved, the service life of the roll is prolonged by more than one time, the cracking defect of the roll body is greatly improved, the quality of a steel coil is improved, the economical efficiency is greatly improved, and the working strength of field equipment personnel exchange operation is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic cross-sectional view of a turning roll according to the present invention.
FIG. 2 is an enlarged view taken at I of FIG. 1 according to the present invention.
In the figure: 100-hot rolling steckel mill turning roll; 1-a roll body; 11-cooling the inner cavity; 12-a first step; 13-a second step; 14-overlaying layer; 2-a first spindle nose; 21-first cooling communication hole; 22-a first countersink; 23-a first frustum; 3-a second spindle head; 31-second cooling communication hole; 32-second taper hole; 33-a second cone; 4-rotary joint for cooling; 41-cooling water inlet; 42-cooling water injection pipe; 43-cooling water outlet; 51-a first bevel; 52-second bevel.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 and 2, a manufacturing process of a steckel mill turning roll is characterized in that a hot rolling steckel mill turning roll 100 comprises a roll body 1, a first shaft head 2 and a second shaft head 3 which are fixedly arranged at two ends of the roll body 1 respectively, a cooling inner cavity 11 which is arranged in the roll body 1 in a penetrating way along the axial direction of the roll body 1 is arranged in the roll body 1, a first cooling communication hole 21 which is arranged in the first shaft head 2 in a penetrating way and communicated with the cooling inner cavity 11 is arranged in the first shaft head, and a second cooling communication hole 31 which is arranged in the second shaft head 3 in a penetrating way and communicated with the cooling inner cavity 11; the roller body 1 is made of Q345-B material, the cooling inner cavity 11 is processed and manufactured by a boring machine, the diameter of the roller body 1 is 400mm, the diameter of the cooling inner cavity 11 is 300mm, the deviation of the wall thickness of the roller body 1 is less than or equal to 0.03mm, the roughness Ra of the inner wall of the roller body 1 is less than or equal to 0.8, and eddy current flaw detection is adopted after the processing of the cooling inner cavity 11 is finished;
the first shaft head 2 and the second shaft head 3 are forged by a Q345-B material, the forging ratio is 4: 1, and 100% UT flaw detection is carried out on the first shaft head 2 and the second shaft head 3 after the forging is finished, so that no quality defect is caused in the inner part; the diameters of the first cooling communication hole 21 and the second cooling communication hole 31 are 50mm, and the deep hole machining process is adopted for manufacturing; the first shaft head 2 and the second shaft head 3 are respectively welded and connected with two ends of the roller body 1 by adopting an embedded fixed structure;
the roller body 1 is bottomed by argon arc welding when being fixedly welded with the first shaft head 2 and the second shaft head 3 in an embedding and inserting manner, and X-ray shooting detection is carried out on a welding seam after welding is finished; before the welding operation of the shaft head and the roller body, the roundness, cylindricity and verticality of the shaft head and the roller body are ensured, and the concentricity of the shaft head and the roller body before welding is also ensured.
After the X-ray shooting detection is finished, a dynamic balance test is carried out, when the rotating speed of the steering roller reaches 680rpm, the dynamic balance grade reaches the G1.6 standard, and the maximum bearing tension is 500KN under the conditions of 950 plus 1100 ℃.
The Q345-B comprises the following components in percentage by mass: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, 1.00-1.60 percent of Mn1.02-0.15 percent of V, 0.015-0.06 percent of Nb0.02-0.2 percent of Ti, 0.04 percent of S, less than or equal to 0.04 percent of P, and the balance of iron and other inevitable impurities.
A first taper hole 22 gradually expanding from the first spindle nose 2 to the roll body 1 is arranged between the first cooling communication hole 21 and the cooling inner cavity 11, and a second taper hole 32 gradually expanding from the second spindle nose 3 to the roll body 1 is arranged between the second cooling communication hole 31 and the cooling inner cavity 11.
A first step part 12 for sleeving the first shaft head 2 is arranged on the outer wall of one end, close to the first shaft head 2, of the roller body 1, the end face of the first shaft head 2 abuts against the first step part 12, and a first groove 51 is formed in the end face of the first shaft head 2 and the first step part 12; the outer wall of the end, close to the second shaft head 3, of the roller body 1 is provided with a second step part 13 for being sleeved with the second shaft head 3, the end face of the second shaft head 3 abuts against the second step part 13, and a second groove 52 is formed in the end face of the second shaft head 3 and the second step part 13.
The outer wall of one end, close to the roller body 1, of the first shaft head 2 is provided with a first frustum 23 with the diameter gradually increased from the first shaft head 2 to the roller body 1, and the outer wall of one end, close to the roller body 1, of the second shaft head 3 is provided with a second frustum 33 with the diameter gradually increased from the second shaft head 3 to the roller body 1.
The rotary joint 4 for cooling is arranged in the first shaft head 2 in a penetrating mode, a cooling water inlet 41 is arranged on the rotary joint 4 for cooling, the cooling water inlet 41 is communicated with a cooling water injection pipe 42, the cooling water injection pipe 42 penetrates through the first cooling communication hole 21 and the cooling inner cavity 11, the free end of the cooling water injection pipe 42 extends into the second cooling communication hole 31, a first annular space is formed between the cooling water injection pipe 42 and the first cooling communication hole 21, a second annular space is formed between the cooling water injection pipe 42 and the second cooling communication hole 31, an inner cavity annular space is formed between the cooling water injection pipe 42 and the cooling inner cavity 11, a cooling water outlet 43 is further arranged on the rotary joint 4 for cooling, and the second annular space is communicated with the cooling water outlet 43.
The outer wall of the roller body 1 is provided with a surfacing layer 14; the overlaying layer 14 is welded by adopting a heat-resistant material SP3 overlaying process, the thickness of the overlaying layer 14 is 7.5mm, and the surface hardness reaches HRC68 +/-2.
Through the improvement to material, structure, forming process, the steckel mill that this embodiment provided turns to the back on-line use, and the effect has reached the anticipated index. From the practical use condition of online:
in the service life, the steering roller is improved from the on-line state in 2019, 8, 7 days, and the off-line state in 2020, 1, 4 days, the service life reaches 5 months, the steel passing amount reaches 50 ten thousand tons, and the steel passing amount is 2.5 times of that of a 45# steel integral forging type steering roller.
From the quality, the roller has bright surface and no crack when being inspected after the off-line process. Therefore, the incidence of the quality defect of the small pits of the hot rolled steel coil is also reduced to 0, and the quality problem of the hot rolled steel coil is thoroughly solved.
From the viewpoint of the working intensity, the annual exchange time before the turning roll modification, including the fixed period exchange and the abnormal fault exchange, is about 2 × 16 × 12/(2 × 0.55) 350 hours on average. And the exchange time is reduced to 77 hours after transformation, the maintenance time is saved to 273 hours, and the labor operation intensity is reduced by 78 percent.
Comparative example 1
45# steel integral forging type steering roller with the size of phi 400mmx2000mm multiplied by 4160mm, maximum rotating speed of 680rpm, maximum tension of 500KN and furnace bottom temperature of 950 and 1100 ℃. Roll diameter of 45# steel integral forging type steering roll
Cooling inner hole
The wall thickness is 150 mm. Because the central cooling water hole is thinner, the diameter ratio of the roller body is only 0.125, the roller has the hidden trouble of poor cooling, and the shutdown caused by the poor cooling is very easy to occur. According to statistics, the abnormal offline rate of the 45# steel integral forging type steering roller reaches 54.8%, wherein 42.9% is caused by cooling, the actual average service life is only 69 days, and 22.6% is offline for less than 50 days. As the temperature of the working environment at the bottom of the furnace is up to 950-. This is also an important cause of roll body cracking, which ultimately results in cracking and water leakage failures that account for over 80% of turning roll failures. From the actual use condition, the main fault problems in daily production and maintenance are roller body deformation and blocking, roller surface material peeling, roller surface cracking, roller water leakage and fracture and the like. Therefore, in routine maintenance, the replacement standard of the turning roll is set to 2 months or 20 ten thousand tons of steel passing.
Due to the cracking of the roller surface, the quality defect of 40mm intermittent small pits at the double sides of the hot-rolled coil occurs, and the steel coil needs to be reprocessed in the next procedure when scaly residues exist.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A manufacturing process of a steckel mill turning roll is characterized in that: the roll body is internally provided with a cooling inner cavity which is arranged in a penetrating way along the axial direction of the roll body, a first cooling communication hole which is arranged in the first shaft head in a penetrating way and communicated with the cooling inner cavity, and a second cooling communication hole which is arranged in the second shaft head in a manner that one end is communicated with the cooling inner cavity and the other end is closed; the roller body is made of Q345-B materials, the cooling inner cavity is machined and manufactured by a boring machine, the diameter of the roller body is 400mm, the diameter of the cooling inner cavity is 300mm, the deviation of the wall thickness of the roller body is less than or equal to 0.03mm, the roughness Ra of the inner wall of the roller body is less than or equal to 0.8, and eddy current flaw detection is adopted after the machining of the cooling inner cavity is finished;
the first shaft head and the second shaft head are forged by adopting a Q345-B material, the forging ratio is 4: 1, and 100% UT flaw detection is carried out on the first shaft head and the second shaft head after the forging is finished, so that no quality defect is caused in the first shaft head and the second shaft head; the diameters of the first cooling communication hole and the second cooling communication hole are 50mm, and the first cooling communication hole and the second cooling communication hole are manufactured by adopting a deep hole machining process; the first shaft head and the second shaft head are respectively welded with two ends of the roller body by adopting an embedded fixed structure;
the roller body is bottomed by argon arc welding when being fixedly welded with the first shaft head and the second shaft head in an embedded and inserted manner, and X-ray shooting detection is carried out on a welding seam after welding is finished;
after the X-ray shooting detection is finished, a dynamic balance test is carried out, when the rotating speed of the steering roller reaches 680rpm, the dynamic balance grade reaches the G1.6 standard, and the maximum bearing tension is 500KN under the conditions of 950 plus 1100 ℃.
2. The process for manufacturing a steckel mill turning roll according to claim 1, characterized in that: in a specific embodiment of the invention, the Q345-B comprises the following components in percentage by mass: less than or equal to 0.20 percent of C, less than or equal to 0.55 percent of Si, 1.00-1.60 percent of Mn1.02-0.15 percent of V, 0.015-0.06 percent of Nb0.02-0.2 percent of Ti, 0.04 percent of S, less than or equal to 0.04 percent of P, and the balance of iron and other inevitable impurities.
3. The process for manufacturing a steckel mill turning roll according to claim 1, characterized in that: a first taper hole gradually expanding from the first shaft head to the roller body is formed between the first cooling communication hole and the cooling inner cavity, and a second taper hole gradually expanding from the second shaft head to the roller body is formed between the second cooling communication hole and the cooling inner cavity.
4. The process for manufacturing a steckel mill turning roll according to claim 1, characterized in that: a first step part for sleeving the first shaft head is arranged on the outer wall of one end, close to the first shaft head, of the roller body, the end face of the first shaft head abuts against the first step part, and a first groove is formed in the end face of the first shaft head and the first step part; the outer wall of the roller body, close to one end of the second shaft head, is provided with a second step portion used for being sleeved with the second shaft head, the end face of the second shaft head abuts against the second step portion, and a second groove is formed in the end face of the second shaft head and the second step portion.
5. The process for manufacturing a steckel mill turning roll according to claim 1, characterized in that: be provided with the diameter on the outer wall of the one end of the nearly roller body of first spindle head to the gradual first frustum of roller body, the second spindle head is close be provided with the diameter on the outer wall of the one end of roller body from the gradual second frustum of second spindle head to the gradual increase of roller body.
6. The process for manufacturing a steckel mill turning roll according to claim 1, characterized in that: wear to establish the rotary joint for the cooling in the first spindle nose, be provided with the cooling water entry on the rotary joint for the cooling, the cooling water entry communicates in a cooling water filling pipe, the cooling water filling pipe wear to establish through first cooling intercommunicating pore, cooling inner chamber just the free end of cooling water filling pipe extends to in the second cooling intercommunicating pore, the cooling water filling pipe with form first annular space between the first cooling intercommunicating pore, the cooling water filling pipe with form second annular space between the second cooling intercommunicating pore, the cooling water filling pipe with form the inner chamber annular space between the cooling inner chamber, still be provided with the cooling water export on the rotary joint for the cooling, second annular space with the cooling water export intercommunication.
7. The process for manufacturing a steckel mill turning roll according to claim 1, characterized in that: a surfacing layer is arranged on the outer wall of the roller body; the surfacing layer is welded by adopting a heat-resistant material SP3 surfacing process, the thickness of the surfacing layer is 7.5mm, and the surface hardness reaches HRC68 +/-2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011627183.1A CN112828055A (en) | 2020-12-31 | 2020-12-31 | Manufacturing process of steckel mill steering roller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011627183.1A CN112828055A (en) | 2020-12-31 | 2020-12-31 | Manufacturing process of steckel mill steering roller |
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| CN112828055A true CN112828055A (en) | 2021-05-25 |
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| CN202011627183.1A Pending CN112828055A (en) | 2020-12-31 | 2020-12-31 | Manufacturing process of steckel mill steering roller |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201046465Y (en) * | 2007-05-10 | 2008-04-16 | 西峡龙成特种材料有限公司 | Inner-cooling type hot-rolling intake roller |
| CN202430266U (en) * | 2011-12-19 | 2012-09-12 | 宝山钢铁股份有限公司 | Heat-insulation gas-cooled carbon sleeve roll |
| CN103831580A (en) * | 2012-11-21 | 2014-06-04 | 上海宝钢工业技术服务有限公司 | Method for manufacturing hard-face roller of rolling mill |
| CN205851564U (en) * | 2016-06-23 | 2017-01-04 | 张家港浦项不锈钢有限公司 | Hot rolling steekle mill slewing rollers |
| CN112139281A (en) * | 2020-08-31 | 2020-12-29 | 中冶南方工程技术有限公司 | Internal cooling type wrapper roll for hot rolled strip steel coiling machine and coiling device |
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2020
- 2020-12-31 CN CN202011627183.1A patent/CN112828055A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201046465Y (en) * | 2007-05-10 | 2008-04-16 | 西峡龙成特种材料有限公司 | Inner-cooling type hot-rolling intake roller |
| CN202430266U (en) * | 2011-12-19 | 2012-09-12 | 宝山钢铁股份有限公司 | Heat-insulation gas-cooled carbon sleeve roll |
| CN103831580A (en) * | 2012-11-21 | 2014-06-04 | 上海宝钢工业技术服务有限公司 | Method for manufacturing hard-face roller of rolling mill |
| CN205851564U (en) * | 2016-06-23 | 2017-01-04 | 张家港浦项不锈钢有限公司 | Hot rolling steekle mill slewing rollers |
| CN112139281A (en) * | 2020-08-31 | 2020-12-29 | 中冶南方工程技术有限公司 | Internal cooling type wrapper roll for hot rolled strip steel coiling machine and coiling device |
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Application publication date: 20210525 |