CN113290046B - Round steel rolling process with optimized guide configuration - Google Patents
Round steel rolling process with optimized guide configuration Download PDFInfo
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- CN113290046B CN113290046B CN202110609531.0A CN202110609531A CN113290046B CN 113290046 B CN113290046 B CN 113290046B CN 202110609531 A CN202110609531 A CN 202110609531A CN 113290046 B CN113290046 B CN 113290046B
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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Abstract
The invention relates to a round steel rolling process for optimizing guide configuration. The round steel rolling process for optimizing the guide configuration comprises six times of medium rolling and four times of finish rolling. Crushing coarse grains in incoming square steel into fine and uniform fine grains, so that the grains in the rolled round steel are tightly and compactly arranged together; the internal structure of the rolled round steel is more compact, and the strength of the steel is improved. Brittle impurities such as carbon, phosphorus and the like in the square steel are rolled to be crushed, while plastic impurities such as manganese, tungsten and the like form round steel after being rolled, the carbon content of the round steel is low, and the mechanical properties such as strength, toughness, processability and the like are obviously improved. The opening degree of the inlet guide of the rolling mill is 120mm to 135mm, and the bell mouth length of the inlet guide is 200mm to 210 mm; when round steel with similar diameter is produced, the guide at the inlet of the rolling mill does not need to be replaced, and the round steel can be produced by the shared guide. The time for replacing the guide is reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of round steel rolling processes, in particular to a round steel rolling process with optimized guide and guard configuration.
Background
In recent years, with the rapid development of economy in China, various industries have increasingly greater requirements on steel and iron and steel quality. Particularly, with the development of industries such as machinery, automobiles, buildings and the like, the market demand for high-quality and high-precision bar steel is obviously increased, so that the bar steel is an important direction for the development of the industries.
In order to meet the market demand, it is necessary to produce high-quality and high-precision bar steel.
In addition, in the existing bar steel production process, the guide replacement time of the rolling mill is long, more manpower and labor hour are consumed, and the bar steel production cost is invisibly increased.
Therefore, there is a need to design a round steel rolling process that optimizes the guide and guard configuration to ameliorate the above-mentioned disadvantages and problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a round steel rolling process which is high in round steel quality, high in mechanical property and short in guide and guard replacement time.
The technical purpose of the invention is realized by the following technical scheme: a round steel rolling process for optimizing guide configuration sequentially comprises intermediate rolling and finish rolling, and is characterized in that,
in the middle rolling, the inclination angle of the groove side wall of the middle rolling mill is between 12 and 15 degrees;
in the finish rolling, the inclination angle of the groove side wall of the finish rolling mill is between 9 and 12 degrees;
in the middle rolling and the finish rolling, the opening degree of an inlet guide at the rolling mill is between 120mm and 135 mm.
In one embodiment, the bell mouth length of the inlet guide at the mill is between 200mm and 210mm during both the intermediate and finish rolling.
In one embodiment, the medium rolling comprises the following steps:
s1: first middle rolling
Pushing the incoming square steel into a first oval hole type rolling mill to perform first medium rolling, wherein the rolling reduction is 39-42 mm, and rolling the incoming square steel into oval blanks in each pass, namely finishing the first medium rolling;
s2: second middle rolling
Pushing the oval blank formed by the first intermediate rolling into a first round hole type rolling mill for second intermediate rolling, wherein the rolling reduction is 39-42 mm, and rolling the oval blank formed by the first intermediate rolling into a round blank in each pass, namely finishing the second intermediate rolling;
the medium rolling comprises the following steps:
s3: third middle rolling
Pushing the round blank formed by the second middle rolling into a second oval hole type rolling mill for third middle rolling, wherein the rolling reduction is 68-72 mm, and rolling the round blank formed by the second middle rolling into an oval blank in each pass, namely finishing the third middle rolling;
s4: fourth middle rolling
Pushing the oval blank formed by the third intermediate rolling into a second round hole type rolling mill to perform fourth intermediate rolling, wherein the rolling reduction is 73-77 mm per pass, and rolling the oval blank formed by the third intermediate rolling into a round blank, namely finishing the fourth intermediate rolling;
s5: fifth middle rolling
Pushing the round blank formed by the fourth intermediate rolling into a third elliptical hole type rolling mill to perform fifth intermediate rolling, wherein the rolling reduction is 48-52 mm per pass, and rolling the round blank formed by the fourth intermediate rolling into an elliptical blank with the size, namely finishing the fifth intermediate rolling;
s6: sixth middle rolling
Pushing the oval blank formed by the fifth intermediate rolling into a third round hole type rolling mill to perform sixth intermediate rolling, wherein the rolling reduction is 53-57 mm per pass, and rolling the oval blank formed by the fifth intermediate rolling into a round blank, namely finishing the sixth intermediate rolling;
s7: first shearing
Shearing the head and the tail of the sixth medium-rolling round blank;
in one embodiment, the finish rolling comprises the steps of:
s8: first finish rolling
Pushing the round blank with the head and the tail cut off in the sixth medium rolling into a fourth oval hole type rolling mill for first finish rolling, wherein the rolling reduction is 29-31 mm, and the round blank with the head and the tail cut off in the sixth medium rolling is rolled into an oval blank in each pass, namely the first finish rolling is completed;
s9: second finish rolling
Pushing the oval blank formed by the first finish rolling into a fourth round hole type rolling mill for second finish rolling, wherein the rolling reduction is 29-31 mm per pass, and rolling the oval blank formed by the first finish rolling into a round blank, namely finishing the second finish rolling;
s10: finish rolling for the third time
Pushing the round blank formed by the secondary finish rolling into a fifth oval hole type rolling mill for carrying out the third finish rolling, wherein the rolling reduction is 24.5-25.5 mm per pass, and rolling the round blank formed by the secondary finish rolling into an oval blank, namely finishing the third finish rolling;
s11: fourth finish rolling
Pushing the oval blank formed by the third finish rolling into a fifth round hole type rolling mill to carry out the fourth finish rolling, wherein the rolling reduction is 9.5-10.5 mm per pass, and rolling the oval blank formed by the third finish rolling into a round blank, namely finishing the fourth finish rolling.
In one embodiment, in steps S1 to S6, the roll diameters of the oval hole rolling mill and the circular hole rolling mill are both 800 mm;
in steps S8 to S11, the roll diameters of the oval hole rolling mill and the circular hole rolling mill are both 610 mm.
In one embodiment, the velocity of the product is between 0.25m/S and 0.9m/S in steps S1-S6;
in steps S8 to S11, the speed of the product is between 1.0m/S and 1.75 m/S.
In one embodiment, in steps S1-S6 and steps S8-S11, each deformation pass elongation coefficient is between 1.1 and 1.4.
In one embodiment, the angle of the upset of the blank between passes is 90 degrees in steps S1-S6 and steps S8-S11.
In one embodiment, the method further comprises the step of S12: second shearing;
and shearing the round blank formed by the fourth finish rolling according to the required length to obtain the round steel with the required multiple length.
In one embodiment, the method further comprises the step of S13: finishing;
and finishing the round steel subjected to the secondary shearing multiple length segmentation.
In conclusion, the invention has the following beneficial effects:
firstly, in the middle rolling, the inclination angle of the groove side wall of the middle rolling mill is between 12 and 15 degrees; in the finish rolling, the inclination angle of the groove side wall of the finish rolling mill is between 9 and 12 degrees; the inclination angle of the hole type of the rolling mill is matched with the opening degree (between 120mm and 135 mm) of the inlet guide at the rolling mill; the inclination angle of the hole shape of the rolling mill is matched with the length (between 200mm and 210 mm) of the bell mouth of the inlet guide at the position of the rolling mill, incoming materials (steel to be rolled or steel billets) of the previous rolling procedure better pass through the hole in the rolling mill, the collision between the incoming materials (the steel to be rolled or the steel billets) of the previous rolling procedure and the inner hole of the rolling mill is reduced, the abrasion of finished steel rolling in the rolling process is reduced, and the quality of the rolled finished steel is improved.
Secondly, crushing coarse grains in the incoming square steel into fine and uniform fine grains through six times of medium rolling and four times of finish rolling, so that the grains in the round steel formed after rolling are closely and compactly arranged together; the original air holes or shrinkage cavities in the square steel are extruded and disappear after being subjected to intermediate rolling and finish rolling, so that the internal structure of round steel formed after being rolled is tighter, and the strength of the steel is improved.
By performing six middle rolling and four finish rolling on the incoming square steel, brittle impurities such as carbon, phosphorus and the like in the square steel are rolled and crushed, and plastic impurities such as manganese, tungsten and the like in the square steel are rolled into a fiber structure, so that the toughness of the round steel formed after rolling is greatly improved.
Therefore, through six times of middle rolling and four times of finish rolling, the finished round steel product formed after rolling has high quality, low carbon content and obviously improved mechanical properties such as strength, toughness, machinability and the like. The rolled round steel can better meet the market demand of higher and higher quality requirement.
Thirdly, in steps S1 to S6 and S8 to S11, the opening degree of the inlet guide of the oval hole type rolling mill and the inlet guide of the round hole type rolling mill are both 120mm to 135mm, and the bell mouth length of the inlet guide is both 200mm to 210 mm; therefore, when round steel with similar diameter is produced, such as round steel with the diameter of 80-100 mm, the guide at the inlet of the rolling mill does not need to be replaced, and the round steel can be produced by the shared guide. The time for replacing the guide is greatly reduced, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present 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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of the steps of a round steel rolling process for optimizing guide configuration provided by the invention;
FIG. 2 is a schematic view of the change of the profile of the cross section of a billet of a round steel rolling process with an optimized guide configuration provided by the invention;
fig. 3 is a schematic view of a guide structure of an optimized guide configuration provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Example 1
See fig. 1-3
This example shows a rolling process for producing phi 80 round steel. The method specifically comprises the following steps:
s1: the first intermediate rolling, namely pushing incoming materials with the square steel size of 205mm multiplied by 205mm into a first oval hole type rolling mill for first intermediate rolling, wherein the rolling reduction is 40mm, and each pass rolls the incoming materials with the size of 205mm multiplied by 205mm into blanks with the size of 164mm multiplied by 221mm, namely finishing the first intermediate rolling; the diameter of the roller of the rolling mill in the middle rolling is 800mm, the value of the roller between two adjacent rollers is 8.0mm, the elongation coefficient of each deformation pass is 1.26, the rolling speed is 0.27m/s, and the area of the rolled piece is 33413mm2；
S2: second middle rolling, pushing the blank with the size of 164mm multiplied by 221mm formed by the first middle rolling into a first round hole type rolling mill for second middle rolling, wherein the rolling reduction is 40mm, and the blank with the size of 164mm multiplied by 221mm is rolled into the blank with the size of 180mm multiplied by 180mm in each pass, namely the second middle rolling is completed; this middle rolling millThe diameter of the rolling rod is 800mm, the value of the roller between two adjacent rolling rods is 7.0mm, the elongation coefficient of each deformation pass is 1.31, the rolling speed is 0.36m/s, and the area of a rolled piece is 25432mm2；
S3: third middle rolling, pushing the blank with the size of 180mm multiplied by 180mm formed by the second middle rolling into a second oval hole type rolling mill for third middle rolling, wherein the rolling reduction is 70mm per pass, and rolling the blank with the size of 180mm multiplied by 180mm into the blank with the size of 112mm multiplied by 214.7mm, namely finishing the third middle rolling; the diameter of the roller of the rolling mill in the middle rolling at this time is 800mm, the value of the roller between two adjacent rollers is 10.8mm, the elongation coefficient of each deformation pass is 1.23, the rolling speed is 0.44m/s, and the area of a rolled piece is 20659mm2；
S4: fourth intermediate rolling, pushing the blank with the size of 112mm multiplied by 214.7mm formed in the third intermediate rolling into a second round hole type rolling mill for fourth intermediate rolling, wherein the rolling reduction is 75mm per pass, and rolling the blank with the size of 112mm multiplied by 214.7mm into the blank with the size of 140mm multiplied by 139.6mm, namely finishing the fourth intermediate rolling; the diameter of the roller of the rolling mill in the middle rolling at this time is 800mm, the value of the roller between two adjacent rollers is 10.0mm, the elongation coefficient of each deformation pass is 1.35, the rolling speed is 0.59m/s, and the area of the rolled piece is 15345mm2；
S5: fifth middle rolling, pushing the blank with the size of 140mm multiplied by 139.6mm formed in the fourth middle rolling into a third oval hole type rolling mill for fifth middle rolling, wherein the rolling reduction is 50mm per pass, and rolling the blank with the size of 140mm multiplied by 139.6mm into the blank with the size of 90mm multiplied by 167.3mm, namely finishing the fifth middle rolling; the diameter of the roller of the rolling mill in the middle rolling is 800mm, the value of the roller between two adjacent rollers is 10.9mm, the elongation coefficient of each deformation pass is 1.26, the rolling speed is 0.74m/s, and the area of the rolled piece is 12226mm2；
S6: sixth intermediate rolling, namely pushing the blank with the size of 90mm multiplied by 167.3mm formed in the fifth intermediate rolling into a third round hole type rolling mill for sixth intermediate rolling, wherein the rolling reduction is 55mm per pass, and the blank with the size of 90mm multiplied by 167.3mm is rolled into the blank with the size of 113mm multiplied by 112.8mm, namely the sixth intermediate rolling is completed; the diameter of the roller of the middle rolling mill is 800mm, and two adjacent rollsThe value of the roll between the rolls was 13.0mm, the elongation coefficient per deformation pass was 1.22, the rolling speed was 0.9m/s, and the rolled piece area was 10006mm2；
S7: first shearing
Shearing the head and the tail of the round blank with the sixth medium rolling size of 113mm multiplied by 112.8 mm; the billet in the first shearing is bitten and the portion of the billet having defects at the head and tail is cut off.
S8: a first finish rolling step, wherein the blanks with the size of 113mm multiplied by 112.8mm formed in the first shearing step are pushed into a fourth oval hole type rolling mill for first finish rolling, the reduction is 30mm, and the blanks with the size of 113mm multiplied by 112.8mm are rolled into blanks with the size of 84mm multiplied by 125.7mm in each pass, so that the first finish rolling step is completed; the diameter of the roller of the rolling mill in the finish rolling is 610mm, the value of the roller between two adjacent rollers is 20.3mm, the elongation coefficient of each deformation pass is 1.12, the rolling speed is 1.01m/s, and the area of a rolled piece is 8931mm2；
S9: a second finish rolling, pushing the blank with the size of 84mm multiplied by 125.7mm formed in the first finish rolling into a fourth round hole type rolling mill for second finish rolling, wherein the reduction is 30mm, and the blank with the size of 84mm multiplied by 125.7mm is rolled into a blank with the size of 95.5mm multiplied by 95.5mm per pass, namely the second finish rolling is completed; the diameter of the roller of the rolling mill in the finish rolling is 610mm, the value of the roller between two adjacent rollers is 6.5mm, the elongation coefficient of each deformation pass is 1.25, the rolling speed is 1.26m/s, and the area of a rolled piece is 7157mm2；
S10: a third finish rolling, namely pushing the blank with the size of 95.5mm multiplied by 95.5mm formed by the second finish rolling into a fifth oval hole type rolling mill for carrying out the third finish rolling, wherein the reduction is 25mm, and the blank with the size of 95.5mm multiplied by 95.5mm is rolled into the blank with the size of 70.7mm multiplied by 107.4mm per pass, namely finishing the third finish rolling; the diameter of the roller of the rolling mill in the finish rolling is 610mm, the value of the roller between two adjacent rollers is 4.4mm, the elongation coefficient of each deformation pass is 1.19, the rolling speed is 1.5m/s, and the area of a rolled piece is 6011mm2；
S11: a fourth finish rolling of pushing the billet of 70.7mm × 107.4mm in size formed in the third finish rolling into a fifth circleAnd (3) carrying out a fourth finish rolling by using a hole type rolling mill, wherein the rolling reduction is 10mm, and each pass is used for rolling the blank with the size of 70.7mm multiplied by 107.4mm into a primary finished product round steel with the size of 80mm multiplied by 80mm, namely, the fourth finish rolling is completed. The diameter of the roller of the rolling mill in the finish rolling is 610mm, the value of the roller between two adjacent rollers is 5.0mm, the elongation coefficient of each deformation pass is 1.17, the rolling speed is 1.75m/s, and the area of a rolled piece is 5150mm2。
Crushing coarse grains in incoming square steel with the size of 205mm multiplied by 205mm into fine and uniform fine particles through six times of medium rolling and four times of finish rolling, so that the grains in round steel with the diameter of about 80mm formed after rolling are closely and compactly arranged together; the original air holes or shrinkage cavities in the square steel with the size of 205mm multiplied by 205mm are extruded and disappear after the middle rolling and the finish rolling, so that the internal structure of the round steel with the diameter of 80mm formed after rolling is tighter, and the strength of the round steel with the diameter of 80mm is improved.
A billet having a cross section of 425mm × 320mm was roughly rolled by an uncoiler to obtain an intermediate billet having a size of 205mm × 205 mm.
By subjecting an incoming square steel having a size of 205mm x 205mm to six medium and four finish rolling, brittle impurities such as carbon, phosphorus, etc. in the square steel having a size of 205mm x 205mm are rolled to be crushed, while plastic impurities such as manganese, tungsten, etc. in the square steel having a size of 205mm x 205mm are rolled to be a fibrous structure, so that the toughness of the round steel of phi 80mm formed after rolling is greatly improved.
In the middle rolling, the inclination angle of the groove side wall of the middle rolling mill is between 12 and 15 degrees; in the finish rolling, the inclination angle of the groove side wall of the finish rolling mill is between 9 and 12 degrees; the inclination angle of the hole type of the rolling mill is matched with the opening degree (between 120mm and 135 mm) of the inlet guide at the rolling mill; the inclination angle of the hole shape of the rolling mill is matched with the length (between 200mm and 210 mm) of the bell mouth of the inlet guide at the position of the rolling mill, incoming materials (steel to be rolled or steel billets) of the previous rolling procedure better pass through the hole in the rolling mill, the collision between the incoming materials (the steel to be rolled or the steel billets) of the previous rolling procedure and the inner hole of the rolling mill is reduced, the abrasion of finished steel rolling in the rolling process is reduced, and the quality of the rolled finished steel is improved.
In addition, through six times of medium rolling and four times of finish rolling, the finished product of the rolled round steel is high in quality, low in carbon content, and remarkably improved in mechanical properties such as strength, toughness and machinability, so that the rolled round steel can better meet the market demand of higher and higher quality requirements.
In steps S1 to S6, the roll diameters of the oval hole rolling mill and the circular hole rolling mill are both 800 mm; in steps S8 to S11, the roll diameters of the oval hole rolling mill and the circular hole rolling mill are both 610 mm. In steps S1 to S6, the speed of the rolled product is between 0.25m/S and 0.9 m/S; in steps S8 to S11, the speed of the product is between 1.0m/S and 1.75 m/S. In steps S1 to S6 and steps S8 to S11, each deformation pass elongation coefficient is between 1.1 and 1.4. In steps S1 to S6 and steps S8 to S11, the angle of the turn-over of the blank is 90 degrees between passes.
Further comprising S12: second shearing; and shearing the round blank formed by the fourth finish rolling according to the required length to obtain the round steel with the required multiple length. Further comprising S13: finishing; and finishing the round steel after the multiple length segmentation. And the precision of the finished round steel is higher through finishing.
In steps S1 to S6 and steps S8 to S11, the openings d1 of the inlet guides of the oval hole rolling mill and the circular hole rolling mill are both 120mm to 135mm, and the bell mouth length d2 of the inlet guides is both 200mm to 210 mm; therefore, when round steel with similar diameter is produced, such as round steel with the diameter of 80mm, the size width of the incoming material is 114 mm; if need produce phi 85mm round steel, the size width of supplied materials is 119mm, satisfies the demand of producing phi 85mm round steel completely, consequently need not change the guide. The guide at the inlet of the rolling mill does not need to be replaced, and the rolling mill can be produced by the shared guide. The time for replacing the guide is greatly reduced, and the production efficiency is improved.
Example 2
See fig. 1-3
This example shows a rolling process for producing round bars of 90mm diameter. The method specifically comprises the following steps:
s1: the first medium rolling, the square steel size is 205mm multiplied by 2Pushing the incoming material with the thickness of 05mm into a first oval hole type rolling mill to perform first medium rolling, wherein the rolling reduction is 40mm, and rolling the incoming material with the size of 205mm multiplied by 205mm into a blank with the size of 164mm multiplied by 221mm in each pass, namely finishing the first medium rolling; the diameter of the roller of the rolling mill in the middle rolling is 800mm, the value of the roller between two adjacent rollers is 8.0mm, the elongation coefficient of each deformation pass is 1.26, the rolling speed is 0.27m/s, and the area of the rolled piece is 33413mm2；
S2: second middle rolling, pushing the blank with the size of 164mm multiplied by 221mm formed by the first middle rolling into a first round hole type rolling mill for second middle rolling, wherein the rolling reduction is 40mm, and the blank with the size of 164mm multiplied by 221mm is rolled into the blank with the size of 180mm multiplied by 180mm in each pass, namely the second middle rolling is completed; the diameter of the roller of the rolling mill in the middle rolling is 800mm, the value of the roller between two adjacent rollers is 7.0mm, the elongation coefficient of each deformation pass is 1.31, the rolling speed is 0.36m/s, and the area of a rolled piece is 25432mm2；
S3: third middle rolling, pushing the blank with the size of 180mm multiplied by 180mm formed by the second middle rolling into a second oval hole type rolling mill for third middle rolling, wherein the rolling reduction is 70mm per pass, and rolling the blank with the size of 180mm multiplied by 180mm into the blank with the size of 112mm multiplied by 214.7mm, namely finishing the third middle rolling; the diameter of the roller of the rolling mill in the middle rolling at this time is 800mm, the value of the roller between two adjacent rollers is 10.8mm, the elongation coefficient of each deformation pass is 1.23, the rolling speed is 0.44m/s, and the area of a rolled piece is 20659mm2；
S4: fourth intermediate rolling, pushing the blank with the size of 112mm multiplied by 214.7mm formed in the third intermediate rolling into a second round hole type rolling mill for fourth intermediate rolling, wherein the rolling reduction is 75mm per pass, and rolling the blank with the size of 112mm multiplied by 214.7mm into the blank with the size of 140mm multiplied by 139.6mm, namely finishing the fourth intermediate rolling; the diameter of the roller of the rolling mill in the middle rolling at this time is 800mm, the value of the roller between two adjacent rollers is 10.0mm, the elongation coefficient of each deformation pass is 1.35, the rolling speed is 0.6m/s, and the area of the rolled piece is 15345mm2；
S5: fifth middle rolling, pushing the blank with the size of 140mm 139.6mm formed in the fourth middle rolling into a third oval hole type rolling mill for fifth middle rollingRolling, wherein the rolling reduction is 50mm, and the blank with the size of 140mm multiplied by 139.6mm is rolled into the blank with the size of 90mm multiplied by 167.3mm in each pass, namely finishing the fifth intermediate rolling; the diameter of the roller of the rolling mill in the middle rolling is 800mm, the value of the roller between two adjacent rollers is 10.9mm, the elongation coefficient of each deformation pass is 1.26, the rolling speed is 0.75m/s, and the area of the rolled piece is 12226mm2；
S6: sixth intermediate rolling, namely pushing the blank with the size of 90mm multiplied by 167.3mm formed in the fifth intermediate rolling into a third round hole type rolling mill for sixth intermediate rolling, wherein the rolling reduction is 55mm per pass, and the blank with the size of 90mm multiplied by 167.3mm is rolled into the blank with the size of 114mm multiplied by 113.98mm, namely the sixth intermediate rolling is completed; the diameter of the roller of the rolling mill in the middle rolling is 800mm, the value of the roller between two adjacent rollers is 9.0mm, the elongation coefficient of each deformation pass is 1.2, the rolling speed is 0.9m/s, and the area of the rolled piece is 10200mm2；
S7: first shearing
Shearing the head and the tail of the round blank which is subjected to the sixth middle rolling and has the size of 114mm multiplied by 113.98 mm; the billet in the first shearing is bitten and the portion of the billet having defects at the head and tail is cut off.
S8: a first finish rolling step, wherein the blanks with the size of 114mm multiplied by 113.98mm formed in the first shearing step are pushed into a fourth oval hole type rolling mill for first finish rolling, the reduction is 30mm, and the blanks with the size of 114mm multiplied by 113.98mm are rolled into blanks with the size of 81mm multiplied by 123.89mm in each pass, namely the first finish rolling step is completed; the diameter of the roller of the rolling mill in the finish rolling is 610mm, the value of the roller between two adjacent rollers is 13.7mm, the elongation coefficient of each deformation pass is 1.29, the rolling speed is 1.16m/s, and the area of a rolled piece is 7877mm2；
S9: a second finish rolling, pushing the blank with the size of 81mm multiplied by 123.89mm formed in the first finish rolling into a fourth round hole type rolling mill for second finish rolling, wherein the reduction is 30mm, and the blank with the size of 81mm multiplied by 123.89mm is rolled into a blank with the size of 91.2mm multiplied by 91.14mm per pass, namely, the second finish rolling is completed; the diameter of the roller of the rolling mill in the finish rolling is 610mm, the value of the roller between two adjacent rollers is 5.1mm, and each deformation pass is extendedThe coefficient is 1.21, the rolling speed is 1.4m/s, and the area of a rolled piece is 6525mm2。
Crushing coarse grains in incoming square steel with the size of 205mm multiplied by 205mm into fine and uniform fine particles through six times of medium rolling and two times of finish rolling, so that the grains in round steel with the diameter of about 90mm formed after rolling are closely and compactly arranged together; original air holes or shrinkage cavities in square steel with the size of 205mm multiplied by 205mm are extruded and disappear after medium rolling and finish rolling, so that the internal structure of round steel with the diameter of 90mm formed after rolling is tighter, and the strength of the round steel with the diameter of 90mm is improved.
A billet having a cross section of 425mm × 320mm was roughly rolled by an uncoiler to obtain an intermediate billet having a size of 205mm × 205 mm.
By subjecting an incoming square steel having a size of 205mm x 205mm to six medium and four finish rolling, brittle impurities such as carbon, phosphorus, etc. in the square steel having a size of 205mm x 205mm are rolled to be crushed, while plastic impurities such as manganese, tungsten, etc. in the square steel having a size of 205mm x 205mm are rolled to be a fiber structure, so that the toughness of the round steel having a diameter of 90mm formed after rolling is greatly improved.
Compared with the example 1, the diameter of the finished product is smaller than that of the example 1, so that the example 2 has less finish rolling for two times, but the mechanical properties such as strength, toughness and processability are still high, and the market demand of higher and higher quality requirements can be met. Since two finishing rolling steps are omitted as compared with example 1, the production cost is also lower than that of example 1.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A round steel rolling process with optimized guide configuration is used for producing round steel with phi 80mm to phi 100mm, sequentially comprises medium rolling and finish rolling, and is characterized in that,
in the middle rolling, the inclination angle of the groove side wall of the middle rolling mill is between 12 and 15 degrees;
in the finish rolling, the inclination angle of the groove side wall of the finish rolling mill is between 9 and 12 degrees;
in the middle rolling and finish rolling processes, the opening degree of an inlet guide at the rolling mill is 120mm to 135mm, and the bell mouth length of the inlet guide at the rolling mill is 200mm to 210 mm;
the medium rolling comprises the following steps:
s1: first middle rolling
Pushing the incoming square steel into a first oval hole type rolling mill to perform first medium rolling, wherein the rolling reduction is 39-42 mm, and rolling the incoming square steel into oval blanks in each pass, namely finishing the first medium rolling;
s2: second middle rolling
Pushing the oval blank formed by the first intermediate rolling into a first round hole type rolling mill for second intermediate rolling, wherein the rolling reduction is 39-42 mm, and rolling the oval blank formed by the first intermediate rolling into a round blank in each pass, namely finishing the second intermediate rolling;
s3: third middle rolling
Pushing the round blank formed by the second middle rolling into a second oval hole type rolling mill for third middle rolling, wherein the rolling reduction is 68-72 mm, and rolling the round blank formed by the second middle rolling into an oval blank in each pass, namely finishing the third middle rolling;
s4: fourth middle rolling
Pushing the oval blank formed by the third intermediate rolling into a second round hole type rolling mill to perform fourth intermediate rolling, wherein the rolling reduction is 73-77 mm per pass, and rolling the oval blank formed by the third intermediate rolling into a round blank, namely finishing the fourth intermediate rolling;
s5: fifth middle rolling
Pushing the round blank formed by the fourth intermediate rolling into a third oval hole type rolling mill for fifth intermediate rolling, wherein the rolling reduction is 48-52 mm per pass, and rolling the round blank formed by the fourth intermediate rolling into an oval blank, namely finishing the fifth intermediate rolling;
s6: sixth middle rolling
Pushing the oval blank formed by the fifth intermediate rolling into a third round hole type rolling mill to perform sixth intermediate rolling, wherein the rolling reduction is 53-57 mm per pass, and rolling the oval blank formed by the fifth intermediate rolling into a round blank, namely finishing the sixth intermediate rolling;
s7: first shearing
Shearing the head and the tail of the sixth medium-rolling round blank;
the finish rolling comprises the following steps:
s8: first finish rolling
Pushing the round blank with the head and the tail cut off in the sixth medium rolling into a fourth oval hole type rolling mill for first finish rolling, wherein the rolling reduction is 29-31 mm, and the round blank with the head and the tail cut off in the sixth medium rolling is rolled into an oval blank in each pass, namely the first finish rolling is completed;
s9: second finish rolling
Pushing the oval blank formed by the first finish rolling into a fourth round hole type rolling mill for second finish rolling, wherein the rolling reduction is 29-31 mm per pass, and rolling the oval blank formed by the first finish rolling into a round blank, namely finishing the second finish rolling;
s10: finish rolling for the third time
Pushing the round blank formed by the secondary finish rolling into a fifth oval hole type rolling mill for carrying out the third finish rolling, wherein the rolling reduction is 24.5-25.5 mm per pass, and rolling the round blank formed by the secondary finish rolling into an oval blank, namely finishing the third finish rolling;
s11: fourth finish rolling
Pushing the oval blank formed by the third finish rolling into a fifth round hole type rolling mill to carry out the fourth finish rolling, wherein the rolling reduction is 9.5-10.5 mm per pass, and rolling the oval blank formed by the third finish rolling into a round blank, namely finishing the fourth finish rolling.
2. Round steel rolling process with optimized guide and guard configuration according to claim 1,
in steps S1 to S6, the roll diameters of the oval rolling mill and the round rolling mill are both 800 mm;
in steps S8 to S11, the roll diameters of the oval rolling mill and the round rolling mill are both 610 mm.
3. Round steel rolling process with optimized guide and guard configuration according to claim 1,
in steps S1 to S6, the speed of the rolled product is between 0.25m/S and 0.9 m/S;
in steps S8 to S11, the speed of the product is between 1.0m/S and 1.75 m/S.
4. Round steel rolling process with optimized guide and guard configuration according to claim 2,
in steps S1 to S6 and steps S8 to S11, each deformation pass elongation coefficient is between 1.1 and 1.4.
5. Round steel rolling process with optimized guide and guard configuration according to claim 3,
in steps S1 to S6 and steps S8 to S11, the angle of the turn-over of the blank is 90 degrees between passes.
6. Round steel rolling process with optimized guide and guard configuration according to claim 1,
further comprising S12: second shearing;
and shearing the round blank formed by the fourth finish rolling according to the required length to obtain the round steel with the required multiple length.
7. Round steel rolling process with optimized guide and guard configuration according to claim 6,
further comprising S13: finishing;
and finishing the round steel subjected to the secondary shearing multiple length segmentation.
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| KR20040026873A (en) * | 2002-09-26 | 2004-04-01 | 주식회사 포스코 | A guide for finishing mill for wire rod |
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