CN118122770A - Titanium and titanium alloy rod and wire composite production process and production line - Google Patents
Titanium and titanium alloy rod and wire composite production process and production line Download PDFInfo
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- CN118122770A CN118122770A CN202410558101.4A CN202410558101A CN118122770A CN 118122770 A CN118122770 A CN 118122770A CN 202410558101 A CN202410558101 A CN 202410558101A CN 118122770 A CN118122770 A CN 118122770A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 110
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000010936 titanium Substances 0.000 title claims abstract description 101
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 282
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 98
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 229910001339 C alloy Inorganic materials 0.000 claims description 26
- 238000004513 sizing Methods 0.000 claims description 23
- 238000005520 cutting process Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 8
- 229910001299 Cm alloy Inorganic materials 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 230000009194 climbing Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010008 shearing Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
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- 239000002184 metal Substances 0.000 description 3
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- 238000012856 packing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention discloses a titanium and titanium alloy rod and wire composite production process and production line, wherein a heating furnace, a conveying roller way I, a two-roller type high-strength short stress line roughing mill set, a conveying roller way II, a No. 1 flying shear, a first-stage two-roller type high-strength short stress line middle mill set, a No. 2 flying shear, a second-stage two-roller type high-strength short stress line middle mill set, a vertical loop I, a cantilever type heavy-duty roll collar pre-finishing mill set, a vertical loop II, a bar diameter measuring instrument, pinch rollers I and No. 3 flying shears and a steel divider are connected in sequence longitudinally to divide the production line into a titanium and titanium alloy wire production line; the whole production line of the rod and wire is controlled by a computer system, the control level is advanced, and the automation degree is high; the rolling line adopts the typical special bar and wire compound production process that rolling pieces are separated from the thick rolling mill set and the middle rolling mill set and are continuously rolled in other rolling mill sets, thereby realizing the whole-line torsion-free, micro-tension or tension-free rolling and ensuring the high precision and high quality of products.
Description
Technical Field
The invention belongs to the technical field of industrial rod and wire production, and particularly relates to a titanium and titanium alloy rod and wire composite production process and production line.
Background
Titanium and titanium alloy are important structural metals developed in the middle of the 20 th century, have the characteristics of low density, high specific strength, high temperature resistance, low temperature resistance, acid and alkali corrosion resistance, no magnetism, small linear expansion coefficient, good damping property, good biocompatibility and the like, and are widely applied to the fields of aviation, aerospace, medicine, sports, electric power, petrochemical industry, metallurgy and the like, and are called as a third metal growing up after steel and aluminum; at present, the research of titanium alloy is going to the high performance and low cost, but the titanium alloy rolling technology is not mature, and the product is difficult to meet the requirements of the high-end market.
At present, titanium and titanium alloy rods and wires are respectively rolled by a three-roller Y-type continuous rolling mill at home, and the method has the defects that the method depends on the three-roller Y-type continuous rolling mill, is not suitable for being used on a traditional hot continuous rolling mill unit, and the obtained rod blank has smaller size, small product specification range and low coil single weight; the reason is that: the unique atomic structure and crystal structure of titanium and titanium alloy lead to difficult deformation and difficult processing in the process, and the existing process technology generally adopts sectional type multi-firing heating to roll titanium and titanium alloy wires, but cannot realize large disc weight, and has poor rolling quality, high cost and low production efficiency; and the thermal conductivity of titanium and titanium alloy is extremely poor, deformation heat generated by deformation resistance is not easy to be transmitted, particularly when high-strength and high-temperature titanium alloy is rolled, overheat tissues are extremely easy to appear in the metal, so that the phenomena of overheat and non-uniformity of tissues of rolled pieces are easy to appear, the internal tissues and performances of the rolled pieces cannot be ensured, and qualified products are difficult to obtain.
Disclosure of Invention
The invention aims to provide a titanium and titanium alloy rod and wire composite production process and production line, which realize simultaneous continuous rolling of titanium and titanium alloy rods and wires, ensure internal tissues and performances of rolled pieces and directly produce qualified products.
In order to achieve the above purpose, the present invention provides the following technical solutions: a titanium and titanium alloy rod and wire composite production line is characterized in that a heating furnace, a conveying roller way I, a two-roller type high-strength short stress line roughing mill unit, a conveying roller way II, a No.1 flying shear, a first-stage two-roller type high-strength short stress line middle mill unit, a No. 2 flying shear, a second-stage two-roller type high-strength short stress line middle mill unit, a vertical loop I, a cantilever type heavy-duty roll collar pre-finishing mill unit, a vertical loop II, a bar diameter measuring instrument, pinch rollers I, a No. 3 flying shear and a steel divider are sequentially connected in a longitudinal direction to divide the production line into a titanium and titanium alloy wire production line; titanium and titanium alloy bar production line;
The titanium and titanium alloy wire production line comprises a climbing roller way, a horizontal loop, a clamping shear before finish rolling, a cantilever type heavy-duty roll collar finishing mill unit, a reducing mill unit, a sizing mill unit, a wire diameter measuring instrument, a pinch roll II and a coiling machine II which are connected in sequence in the longitudinal direction;
The titanium and titanium alloy bar production line comprises a conveying roller way III, a straightener, a cooling bed and bundling and collecting equipment which are connected in sequence longitudinally.
As a preferred embodiment of the invention, the method further comprises the step of introducing the rolled stock directly through the steel distributor into the accident coil collecting zone of the temporary coiler i in the event of a steel stacking accident in the finishing train.
The invention also discloses a composite production process of the titanium and titanium alloy rods and wires, which comprises the following steps:
step one: heating phi 100 pure titanium and titanium alloy blanks in a heating furnace, and preserving heat;
Step two: feeding the round blank heated in the first step into a two-roller high-strength short stress line roughing mill unit through a conveying roller way I at a speed less than or equal to 1.0 m/s;
Step three: the blank heated in the second step is sent into a two-roller high-strength short stress line roughing mill set, the rolling speed is 0.5-1.4 m/s, the rolling is carried out for 4-6 times, and the pass extension coefficient is 1.2-1.5; the final rolling temperature of the rolled piece is as follows: pure titanium is 700-900 ℃, and titanium alloy is 800-1050 ℃;
Step four: the blank processed in the third step is sent into a rolling mill set in a two-roller high-strength short stress line through a conveying roller way II, and the conveying roller way II is provided with a heat preservation device;
Step five: cutting the blank processed in the fourth step to 50-100 mm end to end, and then feeding the blank into a rolling mill set in a first-stage two-roller high-strength short stress line for rolling;
step six: cutting the blank processed in the fifth step into 50-100 mm ends, and then feeding the blank into a second-stage second-roller type high-strength short stress line rolling mill unit for rolling;
Step seven: the blank processed in the step six is sent into a cantilever heavy-duty roll collar pre-finishing mill unit, the rolling speed is 2.1-5.0 m/s, the rolling is carried out for 2 times, and the pass extension coefficient is as follows: 1.1 to 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium at 700-900 ℃ and titanium alloy at 750-1050 ℃;
Step eight: the rolled piece processed in the seventh step is fed into a cantilever heavy-duty roll collar pre-finishing mill set after 50-100 mm of end and tail cutting;
step nine: cutting the rolled piece conveyed in the step eight by clamping and shearing before horizontal looper and finish rolling into a cantilever type heavy-duty roll collar finishing mill unit;
Step ten: the rolled piece processed in the step nine is sent into a reducing mill unit and a sizing mill unit, the rolling speed is 6.5-18.0 m/s, the rolling is carried out for 2-4 times, and the pass extension coefficient is 1.1-1.3; the final rolling temperature of the rolled piece is as follows: pure titanium at 700-900 ℃ and titanium alloy at 750-1050 ℃;
Step eleven: coiling and collecting the rolled piece processed in the step ten into a finished product coil through a coiling machine II to obtain a titanium and titanium alloy wire finished product;
step twelve: feeding the bar stock processed in the step six into a straightener through a conveying roller way III;
step thirteen: straightening the bar materials conveyed in the step twelve;
Step fourteen: and (3) cooling the bar stock subjected to the thirteenth processing to finally obtain the finished products of the titanium and titanium alloy bars.
In the first step, the heating temperature of the pure titanium blank is 700-950 ℃ and the heating temperature of the titanium alloy blank is 800-1050 ℃.
In the fourth step, the high-strength and high-strength two-roll type rolling mill set is fed into the short stress line at a speed of 0.5-1.4 m/s through a conveying roller way II.
In the fifth step, the rolling speed is 0.55-1.5 m/s, the rolling is 2-6 times, and the pass extension coefficient is 1.1-1.4; the final rolling temperature of the rolled piece is as follows: pure titanium 750-900 deg.c and titanium alloy 750-1050 deg.c.
In the sixth step, the rolling speed is 1.27-3.0 m/s, the rolling is 2-6 times, and the pass extension coefficient is 1.1-1.4; the final rolling temperature of the rolled piece is as follows: pure titanium 750-900 deg.c and titanium alloy 750-1050 deg.c.
In the ninth step, the finish rolling process adopts a plurality of finishing mill sets connected in series to perform multi-pass rolling, the rolling speed is 6.0-16.5 m/s, the rolling is 2-8 passes, and the pass extension coefficient is as follows: 1.1 to 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium at 700-900 deg.c and titanium alloy at 750-1050 deg.c.
Compared with the prior art, the invention has the beneficial effects that:
The whole production line of the rod and wire is controlled by a computer system, the control level is advanced, and the automation degree is high; the rolling line adopts the typical special bar and wire compound production process that rolling pieces are separated from the thick rolling mill set and the middle rolling mill set and are continuously rolled in other rolling mill sets, thereby realizing the whole-line torsion-free, micro-tension or tension-free rolling and ensuring the high precision and high quality of products; because the wire production line is equipped with the reducing sizing mill, the pass system for producing all specifications of products is greatly simplified, the repeated use time of the same rolling procedure is long, the number of times of roll replacement is minimized, the production efficiency is high, the production characteristics of small batch and multiple varieties of special steel are better met, and the method has the advantages of high efficiency, good quality, low cost, strong controllability and the like;
the whole rolling process adopts one-time heating, uniformly heats in a heating furnace, controls the tapping temperature according to different brands of titanium and titanium alloy, and has high heating efficiency;
the hot continuous rolling line adopts a process of controlling rolling and controlled cooling after rolling, and controls the temperature of rolled pieces at each stage in the production process, so that the structure and performance of products can be effectively improved, and products with uniform structure and qualified performance can be obtained; the roughing mill train, the middle mill train, the pre-finishing mill train, the reducing mill train and the sizing mill train are all provided with intermediate devices, so that the temperature of a rolled piece can be controlled;
the rigidity of the rolling mill is high, the end face change can be automatically compensated, the dimension of a rolled piece is stable, and the rolling mill can also perform heat engine rolling and low-temperature rolling, so that the smooth running of controlled rolling is ensured;
The rolling pass can be adjusted in a larger range on the premise of ensuring strict tolerance, and rolling with any specification can be carried out, so that wires with various sizes in the range of rolling mill products can be produced, and the spare amount of rollers can be reduced;
the rolling variety is multiple, the specification range is wide, the commonality of the hole pattern system is strong, one set of hole patterns can adapt to pure titanium and titanium alloy, and the spare amount of a front rolling mill and a roller can be reduced;
the quality of a single coil can reach more than 300kg, the dimensional deviation of the product is small, the surface quality is good, the peeling amount of mechanical processing can be reduced, the consumption of raw materials for mechanical processing is reduced, and therefore the production efficiency and the yield are high.
Drawings
FIG. 1 is a process floor plan of a production line of the present invention;
FIG. 2 is an oval hole pattern of a rolling mill train of the present invention;
FIG. 3 is a circular bore pattern of a rolling mill train of the present invention;
In the figure: 1. a heating furnace; 2. a conveying roller way I; 3. two-roller high-strength short stress line roughing mill unit; 4. a conveying roller way II; 5. 1# flying shears; 6. the first stage two-roller high-strength short stress line middle rolling mill set; 7. 2# flying shears; 8. the second stage is a rolling mill set in a second-stage two-roller high-strength short stress line; 9. a vertical loop I; 10. a cantilever heavy duty roll collar pre-finishing mill train; 11. a loop II is erected; 12. a bar calliper; 13. pinch roll I; 14. 3# flying shears; 15. a steel separator; 16. a coiling machine I; 17. climbing a roller way; 18. a horizontal loop; 19. cutting off before finish rolling; 20. a cantilever heavy duty roll collar finishing mill train; 21. a reducing mill unit; 22. sizing mill units; 23. a wire gauge; 24. pinch roll II; 25. a coiling machine II; 26. a conveying roller way III; 27. a straightener; 28. cooling bed, bundling collecting device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-3, in a first embodiment of the present invention, a titanium and titanium alloy rod and wire composite production line is provided, wherein a heating furnace 1, a conveying roller way i 2, a two-roller type high-strength short stress line roughing mill set 3, a conveying roller way ii 4, a 1# flying shear 5, a rolling mill set 6 in a first stage two-roller type high-strength short stress line, a 2# flying shear 7, a rolling mill set 8 in a second stage two-roller type high-strength short stress line, a vertical loop i 9, a cantilever type heavy-duty roll collar pre-finishing mill set 10, a vertical loop ii 11, a rod calliper 12, pinch rollers i 13, a 3# flying shear 14 and a steel divider 15 are sequentially connected in a longitudinal direction to divide the production line into a titanium and titanium alloy wire production line; titanium and titanium alloy bar production line;
the titanium and titanium alloy wire production line comprises a climbing roller way 17, a horizontal loop 18, a clamping shear 19 before finish rolling, a cantilever type heavy-duty roll collar finishing mill unit 20, a reducing mill unit 21, a sizing mill unit 22, a wire diameter measuring instrument 23, a pinch roll II 24 and a coiling machine II 25 which are connected in sequence in the longitudinal direction;
The titanium and titanium alloy bar production line comprises a conveying roller way III 26, a straightener 27, a cooling bed and a bundling and collecting device 28 which are connected in sequence longitudinally.
In this embodiment, it is preferable to further include an accident coil collecting area for introducing the rolled product directly through the separator 15 into the temporary coiler i 16 when a steel stacking accident occurs in the finishing mill train.
A composite production process of titanium and titanium alloy rods and wires comprises the following steps:
Step one: heating phi 100 pure titanium and titanium alloy blanks in a heating furnace 1, and preserving heat for 1h; wherein the heating temperature of the pure titanium blank is 700 ℃, and the heating temperature of the titanium alloy blank is 800 ℃;
step two: feeding the round blank heated in the first step into a two-roller high-strength short stress line roughing mill unit 3 through a conveying roller way I2 at a speed less than or equal to 1.0 m/s;
step three: the blank heated in the second step is sent into a two-roller high-strength short stress line roughing mill set 3, the rolling speed is 0.5m/s, 4 passes are performed, and the pass extension coefficient is 1.2; the final rolling temperature of the rolled piece is as follows: pure titanium 700 ℃ and titanium alloy 800 ℃;
Step four: feeding the blanks processed in the third step into a rolling mill set in a two-roller type high-strength short stress line at a speed of 0.5m/s through a conveying roller way II 4, wherein the conveying roller way II 4 is provided with a heat preservation device;
step five: cutting the blank processed in the fourth step for 50mm from the end to the tail, and then feeding the blank into a rolling mill set 6 in a first-stage two-roller high-strength short stress line for rolling; the rolling speed is 0.55m/s, the rolling is carried out for 2 times, and the pass extension coefficient is 1.1; the final rolling temperature of the rolled piece is as follows: pure titanium 750 ℃, titanium alloy 750 ℃;
Step six: cutting the blank processed in the fifth step for 50mm end to end, and then feeding the blank into a rolling mill set 8 in a second-stage high-strength short stress line for rolling; the rolling speed is 1.27m/s, the rolling is carried out for 2 times, and the pass extension coefficient is 1.1; the final rolling temperature of the rolled piece is as follows: pure titanium 750 ℃, titanium alloy 750 ℃;
step seven: the blank processed in the step six is sent into a cantilever heavy-duty roll collar pre-finishing mill unit 10, the rolling speed is 2.1m/s, the rolling is carried out for 2 passes, and the pass extension coefficient is as follows: 1.1; the final rolling temperature of the rolled piece is as follows: pure titanium 700 ℃ and titanium alloy 750 ℃;
step eight: the rolled piece processed in the step seven is sent into a cantilever heavy-duty roll collar pre-finishing mill set 10 after 50mm of end and tail cutting;
Step nine: conveying the rolled piece conveyed in the step eight into a cantilever type heavy-duty roll collar finishing mill unit 20 through a horizontal loop 18 and a clamping shear 19 before finish rolling; the finish rolling process adopts a plurality of finishing mill sets connected in series to carry out multi-pass rolling, the rolling speed is 6.0m/s, the rolling is carried out for 2 passes, and the pass extension coefficient is as follows: 1.1; the final rolling temperature of the rolled piece is as follows: pure titanium 700 ℃ and titanium alloy 750 ℃;
Step ten: the rolled piece processed in the step nine is sent to a reducing mill unit 21 and a sizing mill unit 22, the rolling speed is 6.5m/s, the rolling is carried out for 2 times, and the pass extension coefficient is 1.1; the final rolling temperature of the rolled piece is as follows: pure titanium 700 ℃ and titanium alloy 750 ℃;
Step eleven: coiling and collecting the rolled piece processed in the step ten into a finished wire coil through a coiling machine II 25 to obtain titanium and titanium alloy wire finished products;
Step twelve: the bar stock processed in the step six is sent into a straightener 27 through a conveying roller way III 26;
step thirteen: straightening the bar materials conveyed in the step twelve;
Step fourteen: and (3) cooling the bar stock subjected to the thirteenth processing to finally obtain the finished products of the titanium and titanium alloy bars.
The pass system of the rolling mill may employ a conventional shaped pass, with the following shaped pass system being further preferred: rough rolling, middle rolling, pre-finish rolling, reducing and sizing rolling into a hole pattern system with oval-round orderly and alternately arranged; through the design of the hole pattern system, the rolled piece can be stably converted from one section to another section, so that local stress caused by severe uneven deformation is avoided, and the split of the rolled piece is reduced; no sharp edges and corners exist, the rolled piece is cooled uniformly, and the generation of cracks is reduced; the surface oxide skin of the rolled piece can be removed easily;
According to the research on the physical and chemical characteristics of titanium and titanium alloy materials, the key parameters such as heating temperature, rolling speed, rolling tension, hole pattern matching and the like are optimized, and titanium alloy rod and wire products with the diameter of 15mm, single-weight wire coil (more than 300 kg), small diameter deviation, good surface quality, good roundness and uniform tissue performance are rapidly and efficiently produced on a hot continuous rolling unit;
by controlling the heating system, the initial rolling temperature, the rolling speed and the hole pattern, the titanium and titanium alloy blank is rolled into titanium and titanium alloy wires with all specifications of phi 5.5-phi 6.5mm, phi 8-phi 14mm and titanium alloy bars with all specifications of phi 15-phi 50mm after being subjected to shearing, cooling and wire-spinning coiling processes.
The invention can be carried out by adopting conventional equipment in the field, and can also be produced by adopting a traditional hot continuous rolling production line; the following describes key equipment such as rolling mill, flying shears, loopers, pinch rolls, coiling machine and the like in the production line:
a. Rolling mill: the total line comprises 30 rolling mills, namely 6 roughing mill units, 10 middle mill units, 2 pre-finishing mill units, 8 finishing mill units and 4 reducing and stabilizing mill units; the front 16 rolling mills are all 'darniy' rolling mills and are arranged in a flat-overpass mode, and a direct current speed regulating motor is used for independent transmission; micro-tension rolling is carried out between rolling mills No. 1-No. 13 and No. 16-No. 17, and loop rolling is carried out between rolling mills No. 14-No. 16 and No. 17-No. 19; the rear 12 rolling mills are overhead 45-degree cantilever heavy-duty roll collar rolling mills, all are in centralized transmission, direct-current speed regulating motors are adopted, all the products with the specification of phi 5.5-phi 14mm are produced from reducing sizing mill units, and the maximum rolling speed is 20m/s; all specifications of products of the bar with the diameter of phi 15-phi 50mm are discharged from the middle rolling mill, and the maximum rolling speed is 2m/s;
a1, the wire production line realizes whole-line torsion-free, micro-tension or tension-free rolling, and ensures high precision and high quality of products; because the wire production line is provided with the reducing sizing mill, the pass system for producing all-specification products is greatly simplified, the repeated use time of the same rolling procedure is long, the number of times of roll replacement is minimized, the production efficiency is high, and the production characteristics of small batch and multiple varieties of special steel are better satisfied;
a2, adopting a low-speed continuous rolling process in a bar production line, reducing deformation heat generated by deformation resistance in rolling, ensuring internal tissues and performances of rolled pieces, and directly producing qualified bars; the invention can roll titanium and titanium alloy bars with all specifications of phi 15-phi 50mm, realizes the production of high-precision and large-single-weight titanium and titanium alloy bars, and has high production efficiency and low production cost;
the main technical parameters of the rolling mill are shown in the following table
B. Flying shears: the whole line is provided with 3 flying shears, the No. 1 flying shears are positioned between rough rolling and middle rolling, and the head and tail of a rolled piece are cut off after rough rolling, the tail of the rolled piece is cut off, the rolled piece is easy to enter and roll between the middle rolling mill units, and the rolled piece is cut off in case of accidents; the No. 2 flying shears are arranged between the middle rolling mill units, and the middle rolling mill 1 is cut into a head, a tail and a broken; the head and the tail of the rolled piece are cut off, so that the rolled piece can enter a middle rolling 2 machine set for rolling, and the rolled piece is cut off when in accident; the 3# flying shears are arranged behind the pre-finishing mill unit and are used for doubling and segmenting rolled pieces;
c. a loop: 3 vertical loops and 1 horizontal loop are arranged on the whole line; 2 vertical loops are arranged between the No. 14 rolling mill and the No. 16 rolling mill, and 1 vertical loop is arranged between the No. 17 rolling mill and the No. 18 rolling mill; 1 horizontal loopers are arranged between the 18# rolling mill and the 19# rolling mill; the loop can keep no tension or micro tension between the frames and provide a certain buffer space for the accumulation of rolled pieces;
d. Pinch rolls: the front pinch roll of the flying shear is used for maintaining tension between the flying shear and the rolling mill set, feeding the flying shear, accelerating or decelerating the tail of a rolled piece and controlling the tail to form; during normal operation, the pinch roll runs for a long time, and the speed of the pinch roll is set according to the rolling process requirement;
f. coiling machine: the production efficiency and the working quality are higher; the tension can be automatically controlled, and the product quality is ensured; the on-line packing and free cutting can be realized; the automatic control device has the advantages of high automation degree, simplicity in operation, convenience in maintenance and the like; the precision is high, and the coiling machine is suitable for coiling various materials.
The process parameters of the production line are described below:
a heating
The original blank for producing pure titanium and titanium alloy rods and wires is a forged round blank with chemical components meeting the requirements of calibrated brands and milled surfaces, and the blank size is phi 100mm multiplied by 6000mm;
technical parameters of heating the blank by the heating furnace:
heating the blank in a heating furnace at the following temperature: pure titanium: 700-950 ℃; titanium alloy: the temperature is 800-1050 ℃ and the heat preservation time is 1-3.5 h;
b rolling
B1 Rolling in roughing train
The blanks heated by the heating furnace are sent into a No. 1 rack of a roughing mill set by a conveying roller way I, and the conveying speed of the blanks on the conveying roller way I is matched with the linear speed of the roughing No. 1 rack; the speed of the roller is controlled by a motor;
According to the rolling process flow, continuous torsion-free and micro-tension rolling is carried out on 4-6 frames of the roughing mill, all the rolling mills are independently driven by a direct current speed regulating motor, the frames can be replaced integrally, and the replacement of pass of the rollers is convenient to assemble and disassemble; the rolling speed range of the roughing mill is 0.5-1.4 m/s;
the pass system of the roughing mill train comprises the following steps in sequence: ellipse- & gt circle; the pass elongation coefficient is 1.2-1.5; the final rolling temperature of the rolled piece is controlled as follows: pure titanium is 700-900 ℃, and titanium alloy is 800-1050 ℃;
After the last frame of the roughing mill, the rolled piece is conveyed to the middle mill for rolling by a conveying roller way II after being subjected to head and tail shearing by No. 1 fly shears for 50-100 mm, and a heat preservation device is arranged on the conveying roller way II, so that the temperature difference between the head and the tail of the rolled piece is reduced, and meanwhile, the surface temperature drop is reduced;
b2 Rolling in a middling train
The conveying roller way II between the middle rolling mill set and the roughing rolling mill set is long, so that the continuous rolling relation is not established; continuous torsion-free micro-tension rolling is adopted on 1-6 frames of the middle rolling mill unit 1, a No. 2 flying shear is arranged behind the 6 th frame of the middle rolling mill unit 1, rolled pieces enter the 7-10 frames of the middle rolling mill unit 2 after being subjected to head cutting and tail cutting by 50-100 mm, all rolling mills are independently driven by a direct current speed regulating motor, the frames can be integrally replaced, the rollers are convenient to assemble and disassemble to replace pass patterns, the rolling speed range of the middle rolling mill unit 1 is 0.55-1.5 m/s, and the rolling speed range of the middle rolling mill unit 2 is 1.27-3.0 m/s;
the hole pattern system of the middle rolling mill unit 1 is as follows: ellipse- & gt circle; the pass elongation coefficient is 1.1-1.4; the final rolling temperature of the rolled piece is controlled as follows: pure titanium is 750-900 ℃, and titanium alloy is 750-1050 ℃; the hole pattern system of the middle rolling mill unit 2 is as follows: ellipse- & gt circle; the pass elongation coefficient is 1.1-1.4; the final rolling temperature of the rolled piece is controlled as follows: pure titanium is 750-900 ℃, and titanium alloy is 750-1050 ℃;
the flying shears 2# arranged between the middle rolling mill units are also called accident shears, and once a steel stacking accident occurs in or after the pre-finishing rolling mill units, the flying shears are immediately started to cut off rolled pieces and prevent subsequent rolled pieces from continuously entering;
b3 Rolling in a pre-finishing train
A continuous rolling relation is established between the middle rolling mill set and the pre-finishing rolling mill set, 1 vertical loopers are additionally arranged between 2 racks of the pre-finishing rolling mill set, and continuous torsion-free micro-tension rolling is adopted; all rolling mills are independently driven by a direct current speed regulating motor, and a cantilever rolling mill is arranged on a 2-rack of a pre-finishing rolling mill set through a flat standing 90 DEG, and is a roll box insertion mechanism, so that a roll replacement pass is convenient to assemble and disassemble; the rolling speed range of the pre-finishing mill is 2.1-5.0 m/s;
The pass system of the pre-finishing mill train comprises the following steps in sequence: ellipse-circle; the pass elongation coefficient is 1.1-1.3; the final rolling temperature of the rolled piece is controlled as follows: pure titanium is 700-900 ℃, and titanium alloy is 750-1050 ℃;
After the pre-finishing mill set, 1) conveying the wire rod-rolled piece to the finishing mill set for rolling after passing through a 3# flying shear head (tail cutting) for 50-100 mm, wherein a water cooling device and a heat preservation cover are arranged on a roller way to control the temperature of the rolled piece entering the finishing mill set so as to realize controlled cooling and controlled rolling; 2) The bar material-rolled piece is sent into a straightener and a cooling bed through a conveying roller way III after being fixed in length by 3# flying shears;
b4 Rolling in finishing train
The continuous rolling relation is established between the pre-finishing mill unit and the finishing mill unit, rolled pieces are fed into the cantilever type heavy-duty roll collar finishing mill unit through a climbing roller way, a horizontal loop and clamping and shearing before finish rolling, 8 finishing mills connected in series are adopted for multi-pass rolling in the finish rolling process, a top-crossing 45-degree high-rigidity rolling mill is adopted, the rolling mill is subjected to reversing and centralized transmission through a spiral bevel gear through a motor, and the whole-line torsion-free rolling is realized; each side of the single finishing mill is sequentially connected through a coupling between rolling mills, and the rolling speed is 6.0-16.5 m/s;
The pass system of the finishing mill unit comprises the following parts in sequence: ellipse- & gt circle- & gt ellipse- & gt circle; the elongation coefficient is: 1.1 to 1.3; the final rolling temperature of the rolled piece is controlled as follows: pure titanium is 700-900 ℃, and titanium alloy is 750-1050 ℃;
After the last frame of the finishing mill unit, the finished product is sent to a reducing and sizing mill unit by a roller way, and a water cooling device is arranged on the roller way to control the temperature of the rolled piece entering the reducing and sizing mill unit so as to realize controlled cooling and controlled rolling;
b5 Rolling in a reducing and sizing mill
A continuous rolling relation is established between the finishing mill unit and the reducing sizing mill unit, and the frames of the reducing sizing mill units 1-4 adopt continuous torsion-free tension-free rolling; all rolling mills are independently driven by a direct current speed regulating motor, and the stand can be replaced integrally, so that the roll replacement pass can be assembled and disassembled conveniently. The rolling speed range of the reducing sizing mill unit is 6.5-18.0 m/s;
The hole pattern system of the reducing sizing mill unit comprises the following components in sequence: ellipse-circle; the elongation coefficient is: 1.1 to 1.3; the final rolling temperature of the rolled piece is controlled as follows: pure titanium is 700-900 ℃, and titanium alloy is 750-1050 ℃;
b6, hole pattern:
the front 18 rolling mill passes (ellipse- & gtcircle- & gtellipse- & gtcircle- & gt … … & oval-round-empty) +8-wire finishing mill (oval-round hole) +4-wire reduction sizing mill train (oval-circle).
The table below lists the relevant conditions of each frame hole pattern when rolling a titanium alloy wire with the diameter of 6.0mm
C. clamping, cooling, coiling and packing
C1, after the titanium and titanium alloy wires come out of a wire reducing and sizing mill unit, collecting the wires into a coil through a coiling machine, and then placing the coil into a slow cooling tank (carrying out water quenching treatment); immediately cooling in a water cooling section consisting of a multi-stage water tank, and then feeding the cooled water section into a wire laying machine by a pinch roll, wherein the speed of the pinch roll is generally 3% -5% higher than the outlet speed of a wire rolling mill unit, and when wires with different specifications are clamped, the clamping speed of the tail parts of the wires is different; the tail part of the rolled piece is clamped and conveyed at a reduced speed when the small-size rolled piece is clamped and conveyed, so that the speed rising phenomenon of the small-size rolled piece out of a wire rolling mill unit is overcome, and the coiling stability is ensured; when clamping large-size rolled pieces, the tail part is clamped at a high speed so as to push the tail part of the wire rod to form a loop smoothly;
c2, conveying the titanium and titanium alloy bars to a straightener and a cooling bed through a steel separator by a conveying roller way III, conveying the bars to a transverse moving rack, and finally placing the bars on a collecting rack;
d. Surface inspection and bundling
The titanium and titanium alloy rod and wire rolling mill products have large single weight, so the products are weighed in a single piece, and are weighed by using an electronic scale on a modern automatic production line, and the tags are automatically recorded, accumulated and marked; the label is manually bound and hung on the end of the coil/bar to be used as a delivery mark and for production statistics;
sampling on the rolled stock in order to detect the mechanical properties and texture of the rolled stock and to control the quality of the finished rolled stock;
e. product dimensional accuracy
Through detection, rolling titanium and titanium alloy rods and wires: 1) The wire rod product accords with the allowable deviation of the size, the appearance, the weight and the diameter of the hot-rolled wire rod specified in the GB/T14981-2009 standard; 2) The bar product meets the allowable deviation of the diameter, the section and the size of the bar specified in the GB/T1499.2-2007 standard.
Example 2
Referring to fig. 1-3, a second embodiment of the present invention is based on the previous embodiment, except that:
Step one: heating phi 100 pure titanium and titanium alloy blanks in a heating furnace 1, and preserving heat for 2.3 hours; wherein the heating temperature of the pure titanium blank is 820 ℃, and the heating temperature of the titanium alloy blank is 900 ℃;
step two: feeding the round blank heated in the first step into a two-roller high-strength short stress line roughing mill unit 3 through a conveying roller way I2 at a speed less than or equal to 1.0 m/s;
Step three: the blank heated in the second step is sent into a two-roller high-strength short stress line roughing mill unit 3, the rolling speed is 0.9m/s, the rolling is carried out for 5 times, and the pass extension coefficient is 1.4; the final rolling temperature of the rolled piece is as follows: pure titanium 800 ℃ and titanium alloy 900 ℃;
step four: feeding the blanks processed in the third step into a rolling mill set in a two-roller type high-strength short stress line at a speed of 0.9m/s through a conveying roller way II 4, wherein the conveying roller way II 4 is provided with a heat preservation device;
Step five: cutting the blank processed in the fourth step by 75mm from the end to the tail, and then feeding the blank into a rolling mill set 6 in a first-stage two-roller high-strength short stress line for rolling; the rolling speed is 1.0m/s, the rolling is carried out for 4 times, and the pass extension coefficient is 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium 825 ℃, titanium alloy 900 ℃;
Step six: cutting the blank processed in the fifth step by 80mm end to end, and then conveying the blank into a second-stage high-strength short-stress line rolling mill set 8 for rolling; the rolling speed is 2.3m/s, the rolling is carried out for 4 times, and the pass extension coefficient is 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium 825 ℃, titanium alloy 900 ℃;
step seven: the blank processed in the step six is sent into a cantilever heavy-duty roll collar pre-finishing mill unit 10, the rolling speed is 3.8m/s, the rolling is carried out for 2 passes, and the pass extension coefficient is as follows: 1.2; the final rolling temperature of the rolled piece is as follows: pure titanium 800 ℃ and titanium alloy 900 ℃;
Step eight: the rolled piece processed in the seventh step is fed into a cantilever heavy-duty roll collar pre-finishing mill set 10 after being subjected to end-to-end cutting by 75 mm;
Step nine: conveying the rolled piece conveyed in the step eight into a cantilever type heavy-duty roll collar finishing mill unit 20 through a horizontal loop 18 and a clamping shear 19 before finish rolling; the finish rolling process adopts a plurality of finishing mill sets connected in series to carry out multi-pass rolling, the rolling speed is 11m/s, the rolling is 5 passes, and the pass extension coefficient is: 1.2; the final rolling temperature of the rolled piece is as follows: pure titanium 800 ℃ and titanium alloy 900 ℃;
Step ten: the rolled piece processed in the step nine is sent to a reducing mill unit 21 and a sizing mill unit 22, the rolling speed is 12m/s, the rolling is carried out for 3 times, and the pass extension coefficient is 1.2; the final rolling temperature of the rolled piece is as follows: pure titanium 800 ℃ and titanium alloy 900 ℃.
Example 3
Referring to fig. 1-3, a third embodiment of the present invention is shown, which is based on the previous embodiment, except that:
Step one: heating phi 100 pure titanium and titanium alloy blanks in a heating furnace 1, and preserving heat for 3.5 hours; wherein the heating temperature of the pure titanium blank is 950 ℃ and the heating temperature of the titanium alloy blank is 1050 ℃;
step two: feeding the round blank heated in the first step into a two-roller high-strength short stress line roughing mill unit 3 through a conveying roller way I2 at a speed less than or equal to 1.0 m/s;
Step three: the blank heated in the second step is sent into a two-roller high-strength short stress line roughing mill unit 3, the rolling speed is 1.4m/s, the rolling is carried out for 6 times, and the pass extension coefficient is 1.5; the final rolling temperature of the rolled piece is as follows: pure titanium 900 ℃ and titanium alloy 1050 ℃;
step four: feeding the blanks processed in the third step into a rolling mill set in a two-roller type high-strength short stress line at a speed of 1.4m/s through a conveying roller way II 4, wherein the conveying roller way II 4 is provided with a heat preservation device;
Step five: cutting the blank processed in the fourth step by 100mm end to end, and then feeding the blank into a rolling mill set 6 in a first-stage two-roller high-strength short stress line for rolling; the rolling speed is 1.5m/s, the rolling is carried out for 6 times, and the pass extension coefficient is 1.4; the final rolling temperature of the rolled piece is as follows: pure titanium 900 ℃ and titanium alloy 1050 ℃;
Step six: cutting the blank processed in the fifth step for 100mm in length, and then feeding the blank into a rolling mill set 8 in a second-stage high-strength short stress line for rolling; the rolling speed is 3.0m/s, the rolling is carried out for 6 times, and the pass extension coefficient is 1.4; the final rolling temperature of the rolled piece is as follows: pure titanium 900 ℃ and titanium alloy 1050 ℃;
Step seven: the blank processed in the step six is sent into a cantilever heavy-duty roll collar pre-finishing mill unit 10, the rolling speed is 5.0m/s, the rolling is carried out for 2 passes, and the pass extension coefficient is as follows: 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium 900 ℃ and titanium alloy 1050 ℃;
step eight: the rolled piece processed in the step seven is fed into a cantilever heavy-duty roll collar pre-finishing mill set 10 after being subjected to head and tail cutting by 100 mm;
Step nine: conveying the rolled piece conveyed in the step eight into a cantilever type heavy-duty roll collar finishing mill unit 20 through a horizontal loop 18 and a clamping shear 19 before finish rolling; the finish rolling process adopts a plurality of finishing mill sets connected in series to carry out multi-pass rolling, the rolling speed is 16.5m/s, the rolling is 8 passes, and the pass extension coefficient is: 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium 900 ℃ and titanium alloy 1050 ℃;
step ten: the rolled piece processed in the step nine is sent to a reducing mill unit 21 and a sizing mill unit 22, the rolling speed is 18.0m/s, 4 passes are performed, and the pass extension coefficient is 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium 900 ℃ and titanium alloy 1050 ℃.
While embodiments of the present invention have been shown and described in detail with reference to the foregoing detailed description, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A titanium and titanium alloy stick, wire rod composite production line, its characterized in that: the production line is divided into a titanium and titanium alloy wire production line by a heating furnace (1), a conveying roller way I (2), a two-roller type high-strength short stress line roughing mill unit (3), a conveying roller way II (4), a No. 1 flying shear (5), a first-stage two-roller type high-strength short stress line middle mill unit (6), a No. 2 flying shear (7), a second-stage two-roller type high-strength short stress line middle mill unit (8), a vertical loop I (9), a cantilever type heavy-duty roller ring pre-finishing mill unit (10), a vertical loop II (11), a bar calliper (12), a pinch roller I (13), a No. 3 flying shear (14) and a steel divider (15) which are connected in sequence; titanium and titanium alloy bar production line;
The titanium and titanium alloy wire production line comprises a climbing roller way (17), a horizontal loop (18), a front clamping shear (19), a cantilever type heavy-duty roll collar finishing mill unit (20), a reducing mill unit (21), a sizing mill unit (22), a wire diameter measuring instrument (23), a pinch roll II (24) and a coiling machine II (25) which are connected in sequence longitudinally;
The titanium and titanium alloy bar production line comprises a conveying roller way III (26), a straightener (27), a cooling bed and bundling and collecting equipment (28) which are connected in sequence longitudinally.
2. The titanium and titanium alloy rod and wire composite production line according to claim 1, wherein the production line comprises the following steps: further comprises an accident collecting area for guiding the rolled piece into the temporary coiling machine I (16) through the steel separator (15) when the steel stacking accident occurs in the finishing mill unit.
3. A composite production process of titanium and titanium alloy rods and wires is characterized in that: production process using the production line according to claim 1 or 2, the production process being as follows:
Step one: heating phi 100 pure titanium and titanium alloy blanks in a heating furnace (1), and preserving heat;
step two: feeding the round blank heated in the first step into a two-roller high-strength short stress line roughing mill unit (3) at a speed less than or equal to 1.0m/s through a conveying roller way I (2);
Step three: the blank heated in the second step is sent into a two-roller high-strength short stress line roughing mill unit (3), the rolling speed is 0.5-1.4 m/s, the rolling is carried out for 4-6 times, and the pass extension coefficient is 1.2-1.5; the final rolling temperature of the rolled piece is as follows: pure titanium is 700-900 ℃, and titanium alloy is 800-1050 ℃;
step four: the blank processed in the third step is sent into a rolling mill set in a two-roller high-strength short stress line through a conveying roller way II (4), and the conveying roller way II (4) is provided with a heat preservation device;
Step five: cutting the blank processed in the fourth step into 50-100 mm ends, and then feeding the blank into a rolling mill set (6) in a first-stage two-roller high-strength short stress line for rolling;
step six: cutting the blank processed in the fifth step into 50-100 mm ends, and then conveying the blank into a second-stage second-roller type high-strength short-stress line rolling mill unit (8) for rolling;
step seven: the blank processed in the step six is sent into a cantilever heavy-duty roll collar pre-finishing mill unit (10), the rolling speed is 2.1-5.0 m/s, the rolling is carried out for 2 times, and the pass extension coefficient is as follows: 1.1 to 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium at 700-900 ℃ and titanium alloy at 750-1050 ℃;
Step eight: the rolled piece processed in the seventh step is fed into a cantilever heavy-duty roll collar pre-finishing mill unit (10) after 50-100 mm of end and tail cutting;
Step nine: conveying the rolled piece conveyed in the step eight into a cantilever heavy-duty roll collar finishing mill unit (20) through a horizontal loop (18) and a clamping shear (19) before finish rolling;
Step ten: the rolled piece processed in the step nine is sent into a reducing mill unit (21) and a sizing mill unit (22), the rolling speed is 6.5-18.0 m/s, the rolling is carried out for 2-4 times, and the pass extension coefficient is 1.1-1.3; the final rolling temperature of the rolled piece is as follows: pure titanium at 700-900 ℃ and titanium alloy at 750-1050 ℃;
Step eleven: coiling and collecting the rolled piece processed in the step ten into a finished wire coil through a coiling machine II (25) to obtain titanium and titanium alloy wire finished products;
step twelve: the bar stock processed in the step six is sent into a straightener (27) through a conveying roller way III (26);
step thirteen: straightening the bar materials conveyed in the step twelve;
Step fourteen: and (3) cooling the bar stock subjected to the thirteenth processing to finally obtain the finished products of the titanium and titanium alloy bars.
4. A titanium and titanium alloy rod and wire composite production process according to claim 3, which is characterized in that: in the first step, the heating temperature of the pure titanium blank is 700-950 ℃, and the heating temperature of the titanium alloy blank is 800-1050 ℃.
5. A titanium and titanium alloy rod and wire composite production process according to claim 3, which is characterized in that: in the fourth step, the high-strength and short-stress rolling mill set is fed into a two-roll type high-strength and short-stress line through a conveying roller way II (4) at a speed of 0.5-1.4 m/s.
6. A titanium and titanium alloy rod and wire composite production process according to claim 3, which is characterized in that: in the fifth step, the rolling speed is 0.55-1.5 m/s, the rolling is carried out for 2-6 times, and the pass extension coefficient is 1.1-1.4; the final rolling temperature of the rolled piece is as follows: pure titanium 750-900 deg.c and titanium alloy 750-1050 deg.c.
7. A titanium and titanium alloy rod and wire composite production process according to claim 3, which is characterized in that: in the step six, the rolling speed is 1.27-3.0 m/s, the rolling is carried out for 2-6 times, and the pass extension coefficient is 1.1-1.4; the final rolling temperature of the rolled piece is as follows: pure titanium 750-900 deg.c and titanium alloy 750-1050 deg.c.
8. A titanium and titanium alloy rod and wire composite production process according to claim 3, which is characterized in that: in the step nine, the finish rolling process adopts a plurality of finishing mill sets connected in series to carry out multi-pass rolling, the rolling speed is 6.0-16.5 m/s, the rolling is carried out for 2-8 passes, and the pass extension coefficient is as follows: 1.1 to 1.3; the final rolling temperature of the rolled piece is as follows: pure titanium at 700-900 deg.c and titanium alloy at 750-1050 deg.c.
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