Method for producing industrial pure titanium wire by high speed wire production line

Abstract

The application provides a method for producing industrial pure titanium wire by a high-speed wire production line, and compared with the prior art, the application combines the characteristics of industrial pure titanium metal, provides a suitable heating process, and solves the problems of bending blanks and heating uniformity in the heating process; the application combines the characteristics of industrial pure titanium metal, provides a rolling process, especially a cooling process, and solves the problems of strip running caused by uneven cooling in the rolling process; the application combines the characteristics of industrial pure titanium metal, provides a rolling process, and realizes stable batch production of industrial pure titanium wire; the application combines the characteristics of industrial pure titanium metal, provides a Stelmor cooling and conveying process, and guarantees the uniformity of the organization and the stability of the performance of the industrial pure titanium wire. The application solves the technical problem of steel-titanium co-line production, provides a method for economically producing industrial pure titanium wire, does not need to additionally increase equipment investment and transformation cost, and realizes efficient and high-quality batch production.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of metal processing, and particularly relates to a method for producing industrial pure titanium wire by using a high-speed wire production line. BACKGROUND

[0002] Titanium metal is an important metal material developed in the 1950s, and is praised as "modern metal", "strategic metal", "ocean metal", "space metal", "biological metal", "intelligent metal", and is called land, sea and air metal. It is widely used in national defense industry and civil industries such as petroleum, chemical industry, metallurgy, electric power, transportation, medical treatment, ocean, environmental protection, building, sports and tourism and leisure. In 2020, the global titanium production was about 163,000 tons, of which China produced 97,000 tons, maintaining a sustained growth trend.

[0003] At present, industrial pure titanium wire is generally produced by using a segmented multi-pass heating rolling method, but it cannot realize large-diameter heavy weight (the weight of a single roll of wire is generally not more than 10 Kg), and the rolling quality is poor, the cost is high, and the production efficiency is low. Due to the relatively small amount of titanium, the investment cost of a new special titanium rolling production line is high, and the input-output ratio is low. Therefore, in order to efficiently and low-cost produce large-diameter heavy titanium and titanium alloy wire, the high-speed wire production line for rolling steel wire rod is used for industrial pure titanium production, and steel-titanium co-line production is realized, which is a new development trend of industrial pure titanium wire production.

[0004] At present, some research work has been carried out on titanium and titanium alloy bars and T-shaped steel, but most of the work is still in the laboratory research stage. For example, Mao Feilong, Shuai Meirong, Qin Jianping and others published an article in "Hot Working Technology", which focuses on rolling Φ6mm and Φ12mm TC4 titanium alloy bars by using an eight-stand Y-shaped rolling mill; Zhu Yanchun published a master's thesis, which focuses on using finite element software to study the design and simulation of the rolling process hole system of titanium alloy bar and wire; Zhao Yuxian published a master's thesis, which focuses on the cold drawing process of TC4 titanium alloy bar and wire.

[0005] In addition, in the aspect of patents, there are some reports on the production of titanium and titanium alloy profiles (T-shaped, U-shaped, Z-shaped, L-shaped, bar, wire, seamless steel pipe), but there is no report on the rolling of titanium and titanium alloy wire by using a high-speed wire production line.

[0006] The patent document with publication number CN 104028553 A and title "A method for producing TC4 titanium alloy bar and wire by using high-speed continuous rolling mill" published on September 10, 2014 discloses a method for producing TC4 titanium alloy bar and wire by using high-speed continuous rolling mill. The method uses a step-by-step heating furnace to heat the billet, and through high-speed continuous rolling mill for initial rolling, pre-precision rolling, precision rolling, wire drawing, air cooling and coil collecting, the TC4 titanium alloy forged square billet is made into TC4 titanium alloy bar and wire product. On the basis of the original method for producing TC4 titanium alloy bar and wire by high-speed continuous rolling mill, the target line type, roundness and surface hot-rolled bar and wire can be obtained through a single rolling process without intermediate annealing, which shortens the production process, improves the quality, yield and material rate of the bar and wire, and also reduces the production cost of TC4 titanium alloy bar and wire. However, the disclosed method is for producing TC4 titanium alloy bar and wire by high-speed continuous rolling mill, and the heating temperature and cooling during rolling are different from those of industrial pure titanium wire rolling, and the rolling speed is higher than that of pure titanium rolling, the workpiece temperature rises greatly, resulting in large temperature difference between the core and the surface, and causing uneven organization defects.

[0007] The patent document with publication number CN 113000599 A and title "A production method of high-efficiency rolled titanium alloy wire rod" published on June 22, 2021 discloses a production method of high-efficiency rolled titanium alloy wire rod, which comprises the following steps: 1) heating the titanium alloy billet to 800-1000℃ and maintaining for 120-210min; 2) heating the titanium alloy billet for 6 passes of rough rolling, 6 passes of medium rolling and 6 passes of pre-precision rolling, controlling the rolling temperature to be 780-980℃ and the rolling speed to be 1-40m / s; 3) performing 5 passes of precision rolling on the rolled piece, controlling the rolling temperature to be 700-950℃ and the rolling speed to be 40-120m / s; 4) drawing the precision-rolled material into a titanium loose coil, controlling the drawing temperature to be 600-850℃; 5) naturally cooling the titanium loose coil to a coil collecting temperature of 450-550℃, then sending the titanium loose coil to a coil collecting drum for coil collecting and air cooling to room temperature to obtain a titanium alloy wire rod. The method saves time and reduces cost, and is simple to operate, and the obtained titanium wire rod has good surface quality and few defects. The invention is a production method of titanium alloy wire rod, and the heating of the titanium alloy billet is completed in an electric heating furnace, which has low heating efficiency and poor heating uniformity, and low production capacity. In addition, the invention uses a 150x150mm 2 titanium alloy billet to roll a titanium alloy wire rod with a diameter of 7-15mm through 6 passes of rough rolling, 6 passes of medium rolling, 6 passes of pre-precision rolling and 5 passes of precision rolling, which is not suitable for industrial pure titanium rolling because of large single-pass deformation and large deformation resistance of pure titanium.

[0008] CN 103008340 A, entitled A titanium and titanium alloy wire hot continuous rolling production line and production process, published on April 3, 2013, is composed of a heating furnace, a horizontal two-roller rough rolling mill unit, a high-rigidity short-stress line longitudinal two-roller intermediate rolling mill unit, a high-rigidity short-stress line longitudinal two-roller pre-precision rolling mill unit, a Morgan type precision rolling mill unit, and a low-speed active line coil collecting cylinder, which are connected longitudinally in sequence to form a titanium and titanium alloy wire longitudinal rolling production line, and a low-speed continuous rolling process is adopted to reduce the deformation heat generated by the deformation resistance during rolling, ensure the internal organization and performance of the rolled piece, and directly produce qualified wire rods. The present application can roll all specifications of titanium and titanium alloy wire rods with a diameter of φ6.5-φ14.5 mm, realize the production of high-precision and large-coil-weight titanium and titanium alloy wire rods, and has high production efficiency and low production cost. The present application is mainly a low-speed continuous rolling method for titanium and titanium alloy, and does not consider how to control the rolling mill cooling water during rolling and the problem of controlling the cooling of the wire rod after wire drawing. SUMMARY

[0009] The present application aims to provide a method for producing industrial pure titanium wire rods on a high-speed wire rod production line, which rolls industrial pure titanium wire rods on a high-speed wire rod production line for rolling steel wire rods, realizes steel-titanium co-line production, solves the problems of bending and rolling deviation during heating, and can mass-produce industrial pure titanium wire rods with high efficiency and high quality without additional equipment investment and modification costs.

[0010] The specific technical solutions of the present application are as follows:

[0011] A method for producing industrial pure titanium wire rods on a high-speed wire rod production line, comprising the following steps:

[0012] 1) heating industrial pure titanium billets in a walking beam furnace;

[0013] 2) rolling and wire drawing after heating;

[0014] 3) obtaining industrial pure titanium wire rods through a Stelmor scattered coil conveying line.

[0015] In step 1), the industrial pure titanium billets are heated in a walking beam furnace, specifically: the air excess coefficient of the furnace is controlled to be 1.03-1.10, the furnace pressure is controlled to be 5-10 Pa; the preheating section temperature is controlled to be 700-800℃, the heating section temperature is controlled to be 820-870℃, and the soaking section temperature is controlled to be 800-850℃; the industrial pure titanium billets are heated in the furnace for 180min-240min, and the soaking time is ≥60min.

[0016] The industrial pure titanium billet is heated in the walking beam heating furnace. Since titanium is easy to oxidize, the air excess coefficient of the heating furnace is controlled to be 1.03-1.10 and the furnace pressure is 5-10 Pa during heating to avoid serious oxidation. The thermal conductivity of titanium is 15.24 W / (m.K), which is about 1 / 5 of that of iron. In order to ensure the uniform heating of the titanium billet, the heating time is much longer than that of the steel billet, and the soaking time is greater than or equal to 60 min. The final rolling temperature of the rolled industrial pure titanium wire must be limited within a certain range. In order to ensure the smooth rolling and spinning, the heating temperature of the titanium billet is appropriately increased, that is, the heat capacity of the titanium billet is increased, and the final rolling temperature is increased, which is a key process factor for the smooth rolling of the industrial pure titanium. However, when the temperature of the titanium billet exceeds the transformation point (880-890℃), the oxidation of the billet will be intensified, and the formed oxide scale is difficult to remove. Therefore, the temperature of the preheating section is controlled to be 700-800℃, the temperature of the heating section is controlled to be 820-870℃, and the temperature of the soaking section is controlled to be 800-850℃.

[0017] In step 2), when the industrial pure titanium wire is rolled, the diameter of 6.5mm-7mm specification is rolled by 26 or 28 frames, the diameter of 8mm-9mm specification is rolled by 24 or 26 frames, the diameter of 10mm-11mm specification is rolled by 22 or 24 frames, and the diameter of 12mm-14.5mm specification is rolled by 20 or 22 frames.

[0018] The rolling includes rough rolling, intermediate rolling, pre-precision rolling and precision rolling, and the rolling process cooling is as follows: the cooling water of the rough rolling and intermediate rolling mill rollers is closed, the cooling water of the rollers is opened every two titanium material rolling gaps, and the cooling water is closed during rolling and circulated repeatedly. The cooling water of the water cooling section before and after the precision rolling mill is all closed.

[0019] When the industrial pure titanium wire is rolled, the temperature control is as follows: the breakdown rolling mill rolling temperature is 750℃-800℃; the temperature before precision rolling is 800℃-850℃, and the spinning temperature is 770-820℃;

[0020] When the industrial pure titanium wire is rolled, the rolling speed is 20-70m / s, and the rolling speed needs to meet the formula V 钛 =A×V 钢 ×T 精 ÷T 转 , the calculated value is rounded, V 钛 is the rolling speed, the unit is m / s; A is the conversion factor of the rolled industrial pure titanium and the rolled steel, the value range is 0.85-0.9, V 钢 is the speed of the high-speed wire rod mill when rolling the steel billet, the unit is m / s, and the rolling speed of the steel is different for each specification and is known; T 精 is the precision rolling temperature, the unit is ℃, that is, the temperature before rolling is 800℃-850℃; T 转The transition point temperature of pure titanium is 882°C.

[0021] Rolling speed V 钛 In the calculation according to the above formula, the numerical value under the above unit condition is substituted to calculate.

[0022] In rolling, since the yield ratio (σ 0.2 / σ b ) of titanium is high, generally between 0.70-0.95, the plastic deformation is poor and the deformation resistance is large during forming, and the elastic modulus of titanium (106.4 GPa at normal temperature) is relatively low, so it is difficult to process and form titanium, and therefore, as many rolling passes as possible are selected and small single-pass deformation is adopted during rolling of pure titanium. For the diameter of 6.5mm-7mm, 26 or 28 passes are adopted, for the diameter of 8mm-9mm, 24 or 26 passes are adopted, for the diameter of 10mm-11mm, 22 or 24 passes are adopted, and for the diameter of 12mm-14.5mm, 20 or 22 passes are adopted. The rolling process is cooled. Since the thermal conductivity of titanium is small, the heat transfer from the core to the surface of the rolled piece is slow during titanium rolling, and therefore the surface temperature decreases very quickly, and the surface temperature is too low, which easily leads to poor surface elongation of the rolled piece and surface defects. Therefore, during rolling of titanium, the cooling water of the rough rolling and intermediate rolling mill groups is turned off, and the cooling water for cooling the rolls is turned on every two titanium rolling gaps, and is turned off during rolling, and is recycled. The cooling water of the water cooling section before and after the finishing mill is turned off completely and is used as a guide groove. Since the plastic deformation is poor and the deformation resistance is large during forming of titanium, and the processing and forming are difficult, the rolling speed is reduced during rolling, and the rolling speed is controlled according to different specifications, which is 20-70m / s. The rolling speed needs to meet the formula V=A×V 钢 ×T 精 ÷T 转 , the calculated value is rounded, V 钛 is the rolling speed, the unit is m / s; A is the conversion factor of rolling industrial pure titanium and rolling steel, the value range is 0.85-0.9, A is related to the size of the specification, the larger value is taken for large specification, and the smaller value is taken for small specification; V 钢 is the speed of high-speed wire rod mill rolling billet, the unit is m / s; T 精 is the finishing temperature, the unit is °C; T 转 is the transition point temperature of pure titanium, the unit is °C, the value of industrial pure titanium is 882°C.

[0023] After the wire drawing in step 3), the industrial pure titanium wire is transported on the Stelmor conveying line without turning on the fan and is air cooled. Since the thermal conductivity of pure titanium is small, in order to ensure the uniformity of the organization on the cross section of the titanium wire, the air cooling mode is adopted after wire drawing, and the Stelmor fan is turned off completely.

[0024] The industrial pure titanium wire in step 3) is controlled in conveying speed when passing through the Stelmor conveying line: the conveying speed V1 of the first section is controlled between 0.4-0.8 m / s, and the conveying speed of each subsequent section is faster than the previous section by B times of the speed of the first section, i.e. the conveying speed V of each section of the Stelmor is V n+1 = V n +B×V1; n is the nth section of transportation, V n represents the nth section of transportation speed, in m / s, V n+1 is the (n+1)th section of transportation speed; in m / s, B is the transportation speed increasing coefficient, and the value range is 0.05-0.15, which is related to the size of the specification, and a larger value is taken for a large specification and a smaller value is taken for a small specification.

[0025] The titanium wire rolled by the finishing rolling is scattered in a coiled shape on the Stelmor conveying roller way by the wire drawing machine, and is conveyed to the coil collecting station by the conveying roller way to collect the coil. The lap joint point appears on the conveying roller way, the cooling speed at the point is smaller than that at other positions, and thus the temperature difference appears on the coil. In order to reduce the temperature difference, the conveying speed of each section of the Stelmor is controlled, and each subsequent section is faster than the previous section, so as to continuously spread the coil and reduce the temperature difference by changing the lap joint point through the speed difference of each section. At the same time, the conveying speed of the Stelmor is controlled to control the temperature of the collected coil. Since the heat conduction speed of the pure titanium is small, and the air cooling speed is also slower than that of the steel, a lower conveying speed of the Stelmor is adopted. The conveying speed V1 of the first section of the Stelmor is controlled between 0.4-0.8 m / s, and the conveying speed of each subsequent section is faster than the previous section by B times of the speed of the first section, i.e. the conveying speed V of each section of the Stelmor is V n+1 = V n +B×V1.

[0026] After the 150 mm×150 mm×L pure titanium square billet is heated in the walking beam heating furnace, it is sequentially passed through 8 rough rolling mill groups, a flying shear for cutting head / tail, 6 medium rolling mill groups, 4 pre-finishing rolling mill groups, a flying shear for cutting head, a water cooling section, 10 non-twist finishing rolling mill groups, a water cooling section, a wire drawing machine, a Stelmor coil spreading conveying line, a coil collecting station, a coil turning station, a P / F conveying line, and a bundling station, to obtain the industrial pure titanium wire or steel wire.

[0027] The industrial pure titanium wire includes pure titanium with the specifications of TA1, TA2, TA3, TA4, TA5, TA6, TA7, TA8, TA9, TA10, TA13, TA15, and TA18.

[0028] The diameter of the industrial pure titanium wire is Ф6.5-Ф14.5 mm.

[0029] The industrial pure titanium wire produced by the production method has no surface defects, and the allowable deviation of the size is: for 6.5mm≤diameter of the industrial pure titanium wire≤10.0mm, the allowable deviation of the diameter is ±0.25mm, and the non-circularity is ≤0.4mm; for 10.0mm≤diameter of the industrial pure titanium wire≤14.5mm, the allowable deviation of the diameter is ±0.30mm, and the non-circularity is ≤0.48mm.

[0030] Compared with the prior art, the industrial pure titanium wire is rolled on the high-speed wire production line, the steel-titanium co-line production is realized, the industrial pure titanium wire can be produced in large quantities and high quality, the technical problem of the steel-titanium co-line production is solved, a method for economically producing the industrial pure titanium wire is provided, and no additional equipment investment and modification cost is needed. Moreover, the suitable heating process is provided according to the metal characteristics of the industrial pure titanium, the problems such as bending of the blank and uneven heating in the heating process are solved, the rolling process is provided according to the metal characteristics of the industrial pure titanium, especially the cooling process, the problems such as wire breakage caused by uneven cooling in the rolling process are solved, the rolling process is provided according to the metal characteristics of the industrial pure titanium, and the stable batch production of the industrial pure titanium wire is realized, the Stelmor cooling and conveying process is provided according to the metal characteristics of the industrial pure titanium, and the uniform structure and stable performance of the industrial pure titanium wire are ensured. Moreover, the production method is suitable for TA1, TA2, TA3, TA4, TA5, TA6, TA7, TA8, TA9, TA10, TA13, TA15 and TA18, and the specific properties of the industrial pure titanium material and the unique properties of the hot working process are realized, the high-efficiency and high-quality batch production is realized, the original high-speed wire production line can be used, almost no investment is needed, and the economy is strong. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a process flow diagram of the application. DETAILED DESCRIPTION

[0032] The specific embodiments of the application are further described in detail by comparing with the drawings and the description of the embodiments, the purpose is to help the skilled in the art to have more complete, accurate and deep understanding of the concept and technology of the application, and to help its implementation.

[0033] As Figure 1As shown, the industrial pure titanium wire produced by each embodiment of the present application has a production process of industrial pure titanium square billet→step beam heating furnace 1 heating→8-arch rough rolling mill set 2 rolling→flying shear 3 head and tail cutting→6-arch intermediate rolling mill set 4 rolling→4-arch pre-precision rolling mill set 5 rolling→flying shear 6 head cutting→water cooling section 7 passing (without opening cooling water, using as guide groove)→10-arch precision rolling mill set 8 rolling→water cooling section 9 passing (without opening cooling water, using as guide groove)→wire bar coiler 10 coiling→Stelmor loose coil conveying line 11 conveying and control cooling→coiling collecting 12→coil turning 13→P / F conveying line 14 conveying→bundling 15→warehousing. The total number of rolling mills used is 28, and the number of times required is determined according to the rolling pass of different specifications according to the present application.

[0034] The process parameters of the specific embodiments are as follows:

[0035] Embodiment 1

[0036] A method for producing industrial pure titanium wire by a high-speed wire production line, with a brand of TA1 and a specification of diameter Ф10 mm, has the following production procedures:

[0037] 1) Billet preparation: 150×150 mm 2 The square billet has a length of 12 m and no obvious cracks, scabs, pits or other defects on the surface;

[0038] 2) Heating: heating in a step beam heating furnace, with an air excess coefficient of 1.06, a furnace pressure of 7 Pa, a preheating temperature of 730-780℃, a heating temperature of 840-860℃, a soaking temperature of 810-840℃, a soaking time of 87 min, and a time in the furnace of 201 min, and then the billet is conveyed to the rolling mill area by a conveying roller.

[0039] 3) Rolling pass: 24 passes.

[0040] 4) Rolling cooling: the lubricating water and cooling water of the rough rolling mill set and the intermediate rolling mill set are closed, the cooling water is opened to cool the rolls between every two titanium material rolling gaps, and the rolling is closed and circulated repeatedly; the breakdown rolling temperature is 780℃, the temperature before precision rolling is 830℃ (T 精 =830℃), the rolling pass of each pass is executed according to the rolling pass, and the cooling water of the water cooling section before and after the precision rolling is closed.

[0041] 5) Rolling speed: the rolling speed V 钢 of the steel with a specification of 10 mm is 42 m / s, A is 0.9, and the rolling speed needs to satisfy the formula V 钛 =A×V 钢 ×T 精 ÷T 转 , T 精 =830℃, and T 转 =882℃; the rolling speed V 钛35.57 m / s, rounding to 35 m / s;

[0042] 6) Wire laying: the wire laying machine lays the coil, wire laying temperature 785-815°C;

[0043] 7) Loose coil transport and cooling: the first section of the transport roller bed has a speed VI of 0.60 m / s, the transport speed increase coefficient B is 0.10, the Stelmor cooling fan is turned off, the Stelmor transport speed V n+1 = V n +B x VI;

[0044] 8) Coil gathering: the coil gathering machine gathers the coil;

[0045] 9) Coil turning: the coil turning machine turns the coil;

[0046] 10) Transport: the P / F line transports to the position of the baling machine.

[0047] 11) Baling: the baling machine bales.

[0048] 12) Inspection: artificial inspection of the surface quality of the product, shearing of the head and tail, sampling, and storage of the qualified product.

[0049] The production method successfully produces a titanium wire of Ф10 mm specification on a high-speed wire production line, without surface defects, with an outer dimension deviation of -0.15-0.20 mm, and an out-of-roundness of 0.35 mm. The tensile strength R m of the product is 353 MPa, the non-proportional elongation strength R P0.2 is 242 MPa, and the elongation after fracture A is 39%.

[0050] Example 2

[0051] A method for producing an industrial pure titanium wire on a high-speed wire production line, with a TA2 brand and a Ф8 mm specification, the production procedure being as follows:

[0052] 1) Billet preparation: 150 x 150 mm 2 square billet length 12 m, without obvious cracks, scabs, pits, and other defects on the surface;

[0053] 2) Heating: heating in a walking beam furnace, air excess coefficient 1.05, furnace pressure 8 Pa, preheating temperature 740-785°C, heating temperature 835-855°C, soaking temperature 815-850°C, soaking time 95 min, time in the furnace 215 min, then the billet is transported to the rolling mill area by a conveying roller bed.

[0054] 3) Rolling passes: 26 passes.

[0055] 4) Rolling cooling: Turn off the lubricating water and cooling water of the roughing mill and intermediate mill. Turn on the cooling water to cool the rolls between every two titanium rolling passes, and turn it off during rolling. Repeat this cycle. The rolling temperature of the billet mill is 790℃ and the temperature before finishing rolling is 835℃. The rolling pass pattern of each pass shall be implemented according to the rolling pass pattern. Turn off the cooling water in the water-cooled section before and after finishing rolling.

[0056] 5) Rolling speed: The rolling speed V for 8mm steel specifications 钢 The rolling speed is 63 m / s, A is taken as 0.88, and the rolling speed must satisfy the formula V. 钛 =A×V×T 精 ÷T 转 T 精 =835℃, T 转 =882℃; Calculate the rolling speed V 钛 The value is 52.48 m / s, rounded down to 52 m / s.

[0057] 6) Spinning: Spinning machine cloth ring, spinning temperature 785-815℃;

[0058] 7) Loose Roll Conveying and Cooling: The first section of the conveyor roller conveyor has a speed V1 of 0.55 m / s, and the conveying speed enhancement coefficient B is 0.10. The Steyrmo cooling fan is turned off. The conveying speeds V in each section of the Steyrmo conveyor are as follows: n+1 =V n +B×V1;

[0059] 8) Roll collection: Roll collection machine collects rolls;

[0060] 9) Tilting: Tilting the rolls using a tilting machine;

[0061] 10) Transportation: P / F line transport to the baler location.

[0062] 11) Bundling: Bundling with a bundling machine.

[0063] 12) Inspection: Manually inspect the surface quality of the product, cut off the head and tail, take samples, and put qualified products into the warehouse.

[0064] This production method successfully produced Ф8mm industrial pure titanium wire on a high-speed wire rod production line. The wire was free of surface defects, with dimensional deviations of -0.10-0.25mm and a roundness of 0.30mm. The tensile strength R of the product was [not specified]. m 356 MPa, non-proportional elongation strength R P0.2 =234MPa, elongation after fracture A =41%.

[0065] Example 3

[0066] A method for producing industrial pure titanium wire of grade TA4 and specification Ф6.5mm using a high-speed wire rod production line, and the production process is as follows:

[0067] 1) Blank preparation: 150×150mm 2 The billet is 12m long and has no obvious cracks, scars, pits or other defects on its surface;

[0068] 2) Heating: Heating is carried out in a walking beam furnace with an excess air coefficient of 1.07, a furnace pressure of 5 Pa, a preheating temperature of 750-795℃, a heating temperature of 830-865℃, a soaking temperature of 805-845℃, a soaking time of 100 min, and a furnace time of 230 min. Then, the billet is transported to the rolling mill area by the conveyor rollers.

[0069] 3) Rolling passes: 28 passes.

[0070] 4) Rolling cooling: Turn off the lubricating water and cooling water of the roughing mill and intermediate mill. Turn on the cooling water to cool the rolls between every two titanium rolling passes, and turn it off during rolling. Repeat this cycle. The rolling temperature of the billet mill is 785℃ and the temperature before finishing rolling is 840℃. The rolling pass pattern of each pass shall be implemented according to the rolling pass pattern. Turn off the cooling water in the water-cooled section before and after finishing rolling.

[0071] 5) Rolling speed: The rolling speed V for 6.5mm specification steel 钢 The rolling speed is 82 m / s, A is taken as 0.86, and the rolling speed must satisfy the formula V. 钛 =A×V 钢 ×T 精 ÷T 转 T 精 =840℃, T 转 =882℃; Calculate the rolling speed V 钛 The value is 67.16 m / s, rounded down to 67 m / s.

[0072] 6) Spinning: Spinning machine cloth ring, spinning temperature 785-815℃;

[0073] 7) Loose Roll Conveying and Cooling: The first section of the conveyor roller conveyor has a speed V1 of 0.65 m / s, and the conveying speed enhancement coefficient B is 0.08. The Steyrmo cooling fan is turned off. The conveying speeds V in each section of the Steyrmo conveyor... n+1 =V n +B×V1;

[0074] 8) Roll collection: Roll collection machine collects rolls;

[0075] 9) Tilting: Tilting the rolls using a tilting machine;

[0076] 10) Transportation: P / F line transport to the baler location.

[0077] 11) Bundling: Bundling with a bundling machine.

[0078] 12) Inspection: manual inspection of the surface quality of the product, shearing head and tail, sampling, and storage of qualified products.

[0079] The production method successfully produced a titanium wire of size Ф6.5 on a high-speed wire production line, without surface defects, with an outer size deviation of -0.20-0.15 mm, and an out-of-roundness of 0.35 mm. The tensile strength R m of the product was 375 MPa, the non-proportional elongation strength R P0.2 was 258 MPa, and the elongation after fracture A was 39%.

[0080] Example 4

[0081] A method for producing industrial pure titanium wire on a high-speed wire production line, in which titanium wire is rolled on a high-speed wire production line, with a grade of TA8 and a size of Ф12.5 mm, and the production process is as follows:

[0082] 1) Billet preparation: 150x150 mm 2 square billet length of 12 m, without obvious cracks, scabs, pits, and other defects on the surface;

[0083] 2) Heating: heating in a walking beam furnace, with an air excess coefficient of 1.04, a furnace pressure of 7 Pa, a preheating temperature of 745-780°C, a heating temperature of 835-860°C, a soaking temperature of 810-845°C, and a soaking time of 89 min, with a time in the furnace of 195 min, and then the billet is transported to the rolling mill area by a conveying roller.

[0084] 3) Rolling passes: 22 passes.

[0085] 4) Rolling cooling: the rolling mill lubrication water and cooling water of the rough rolling mill group and the intermediate rolling mill group are closed, the cooling water is opened to cool the roller every two titanium material rolling gaps, and the circulation is repeated; the rolling temperature of the breakdown rolling mill is 795°C, and the temperature before finish rolling is 845°C, the rolling pass of each pass is executed according to the rolling pass, and the cooling water of the water cooling section before and after the finish rolling is closed.

[0086] 5) Rolling speed: the rolling speed V 钢 of the 12.5 mm size steel is 27 m / s, A is taken as 0.9, and the rolling speed needs to satisfy the formula V 钛 = A x V 钢 x T 精 ÷ T 转 , T 精 = 845°C, T 转 = 882°C; the rolling speed V 钛 is calculated as 23.28 m / s, and is taken as 23 m / s;

[0087] 6) Wire laying: the wire laying machine lays the coil, and the wire laying temperature is 770-810°C.

[0088] 7) Loose coil transport cooling: the first section of the transport roller V1 is 0.4 m / s, the transport speed promotion coefficient B is 0.12, and the Stelmor cooling fan is turned off; the transport speed V n+1 = V n +B x V1;

[0089] 8) Coil collection: the coil collector collects the coil;

[0090] 9) Coil turning: the coil turning machine turns the coil;

[0091] 10) Transport: the P / F line is transported to the position of the baling machine.

[0092] 11) Baling: the baling machine bales.

[0093] 12) Inspection: the surface quality of the product is manually inspected, the head and tail are cut, sampling is performed, and the qualified product is stored.

[0094] Using the production method, the industrial pure titanium wire with a specification of Ф12.5 is successfully produced on the high-speed wire production line, without surface defects, with an outer size deviation of -0.15-0.20 mm, and an out-of-roundness of 0.30 mm. The tensile strength R m of the product is 360 MPa, the non-proportional elongation strength R P0.2 is 237 MPa, and the elongation A after breaking is 40%.

[0095] Comparative Example 1

[0096] A method for producing an industrial pure titanium wire on a high-speed wire production line, with a specification of Ф10 mm and a grade of TA1, includes the following production procedures:

[0097] 1) Billet preparation: 150 x 150 mm 2 square billet with a length of 12 m, without obvious cracks, scabs, pits, and other defects on the surface;

[0098] 2) Heating: heating in a walking beam furnace, with an air excess coefficient of 1.06, a furnace pressure of 7 Pa, a preheating temperature of 740-795℃, Heating temperature 915-960°C , Soaking temperature 880-920°C a soaking time of 125 min, and a time in the furnace of 225 min. The titanium billet is bent in the heating furnace, which causes the titanium billet to be unable to exit the heating furnace. The heating furnace is extinguished for 20 hours before the titanium billet is cleaned out of the heating furnace, which cannot be rolled and the rolling is interrupted.

[0099] Comparative Example 2

[0100] A method for producing an industrial pure titanium wire on a high-speed wire production line, with a specification of Ф10 mm and a grade of TA2, includes the following production procedures:

[0101] 1) Billet preparation: 150 x 150 mm2 The bloom has a length of 12 m, and no obvious cracks, scabs, pits and other defects on the surface;

[0102] 2) Heating: heating in a walking beam heating furnace, excess air coefficient 1.06, furnace pressure 7 Pa, preheating temperature 735-795℃, heating temperature 825-865℃, soaking temperature 810-845℃, soaking time: 113 min, time in the furnace 205 min, then the billet is transported to the rolling mill area by the conveying roller.

[0103] 3) Rolling passes: 24 passes.

[0104] 4) Rolling cooling: Rolling mill lubrication water and cooling water of rough rolling mill and intermediate rolling mill are normally opened The roughing mill rolling temperature is 790℃, Temperature before finish rolling 775°C The rolling pass of each pass is carried out according to the steel rolling pass, and the cooling water of the water cooling section before closing the finishing mill and after the finishing mill.

[0105] 5) Rolling speed: the rolling speed V 钢 of the 8 mm specification steel is 63 m / s, A is 0.88, and the rolling speed needs to meet the formula V 钛 = A x V 钢 x T 精 ÷ T 转 , T 精 = 775℃, T 转 = 882℃; the calculated rolling speed V 钛 is 48.71 m / s, and the integer is 48 m / s;

[0106] During the rolling process, the rolled piece has a strip running accident in the finishing mill, and the rolling is interrupted.

[0107] Comparative Example 3

[0108] A method for producing industrial pure titanium wire by a high-speed wire production line, the grade is TA1, and the specification is Ф6.5 mm, and the production process is as follows:

[0109] 1) Billet preparation: 150 x 150 mm 2 The bloom has a length of 12 m, and no obvious cracks, scabs, pits and other defects on the surface;

[0110] 2) Heating: heating in a walking beam heating furnace, excess air coefficient 1.08, furnace pressure 8 Pa, preheating temperature 730-785℃, heating temperature 825-865℃, soaking temperature 815-845℃, soaking time: 110 min, time in the furnace 223 min, then the billet is transported to the rolling mill area by the conveying roller.

[0111] 3) Rolling passes: 28 passes.

[0112] 4) Rolling Cooling: Shut down the lubricating and cooling water of the roughing and intermediate rolling mills. Open the cooling water to cool the rolls between every two titanium rolls, then close it during rolling, repeating this cycle. The rolling temperature of the billet mill is 785℃. Water cooling before finish rolling Segment water flow 58 m 3 / h, finishing temperature 785 °C The rolling pass pattern for each pass shall be executed in accordance with the rolling pass pattern, and the cooling water in the water-cooling section after finishing rolling shall be turned off.

[0113] 5) Rolling speed: The rolling speed V for 6.5mm specification steel 钢 The rolling speed is 82 m / s, A is taken as 0.86, and the rolling speed must satisfy the formula V. 钛 =A×V 钢 ×T 精 ÷T 转 T 精 =785℃, T 转 =882℃; Calculate the rolling speed V 钛 The value is 62.76 m / s, rounded down to 62 m / s.

[0114] 6) Spinning: The spinning machine produces fabric loops, with a spinning temperature of 755℃;

[0115] 7) Loose roll transport cooling: The first section of the transport roller conveyor has a speed V1 of 0.60 m / s, the transport speed enhancement coefficient B is 0.10, and the Stellmore cooling fan is turned off;

[0116] 8) Roll collection: Roll collection machine collects rolls;

[0117] 9) Tilting: Tilting the rolls using a tilting machine;

[0118] 10) Transportation: P / F line transport to the baler location.

[0119] 11) Bundling: Bundling with a bundling machine.

[0120] 12) Inspection: Manually inspect the surface quality of the product, cut off the head and tail, take samples, and put qualified products into the warehouse.

[0121] This production method successfully produced Ф6.5 specification industrial pure titanium wire on a high-speed wire rod production line. The wire exhibited severe surface scaling defects, caused by low surface temperature and low surface elongation during the finishing rolling process. Dimensional deviation: -0.20-0.25mm, out-of-roundness 0.43mm. The tensile strength R of the product... m 390 MPa, non-proportional elongation strength R P0.2 =283MPa, elongation after fracture A =33%.

Claims

1. A method for producing an industrial pure titanium wire by a high speed wire production line, characterized in that, The method for producing industrial pure titanium wire by the high-speed wire production line comprises the following steps: 1) heating the industrial pure titanium billet in a walking beam heating furnace; the air excess coefficient is 1.03-1.10, the furnace pressure is 5-10 Pa; the preheating section temperature is controlled to be 700-800 DEG C, the heating section temperature is 820-870 DEG C, and the soaking section temperature is 800-850 DEG C; 2) after heating, rolling and wire drawing; 3) passing through the Stelmor scattered coil conveying line to obtain the industrial pure titanium wire; In step 1), the industrial pure titanium billet is heated for 180 min-240 min, wherein the soaking time is greater than or equal to 60 min; In the step 2), the rolling of the industrial pure titanium wire rod comprises rough rolling, intermediate rolling, pre-precision rolling and precision rolling, and the rolling process cooling is as follows: the cooling water of the rough rolling and intermediate rolling mill is closed, the cooling water of the cooling roller is opened every two titanium material rolling gaps, and the rolling is closed in circulation; the cooling water of the front and rear water cooling sections of the precision rolling mill is all closed, and is used as a guide groove; when the industrial pure titanium wire rod is rolled, the temperature control is as follows: the rolling temperature of the blooming mill is 750-800 DEG C; the temperature before the precision rolling is 800-850 DEG C, and the wire drawing temperature is 770-820 DEG C; the rolling speed is 20-70 m / s; the rolling speed needs to satisfy the formula V 钛 =A×V 钢 ×T 精 ÷T 转 , the calculated value is rounded, V 钛 is the rolling speed, the unit is m / s; A is the conversion coefficient of the rolling industrial pure titanium and the rolling steel, the value range is 0.85-0.9, V 钢 is the speed of the high-speed wire rod mill when rolling the steel billet, the unit is m / s; T 精 is the precision rolling temperature, the unit is DEG C; T 转 is the pure titanium transformation point temperature, the unit is DEG C, and the value of the industrial pure titanium is 882 DEG C; The industrial pure titanium wire in step 3) is controlled at a conveying speed when passing through the Stelmor conveying line: the conveying speed V1 of the first section is controlled at 0.4-0.8 m / s, and the conveying speed of each subsequent section is B times faster than the speed of the previous section, i.e. the conveying speed Vn of each section of the Stelmor is Vn=Vn+1+B×V1; n is the nth section of transportation, Vn represents the nth section of transportation speed, with units of m / s, Vn+1 is the n+1 section of transportation speed; units of m / s, and B is a transportation speed increasing coefficient, with a value range of 0.05-0.

15. n+1 n n+1 ​​​ 2. The method of producing an industrial pure titanium wire according to claim 1, wherein In step 2), when the industrial pure titanium wire is rolled, the 26 or 28-arch rolling is adopted for the diameter of 6.5 mm-7 mm, the 24 or 26-arch rolling is adopted for the diameter of 8 mm-9 mm, the 22 or 24-arch rolling is adopted for the diameter of 10 mm-11 mm, and the 20 or 22-arch rolling is adopted for the diameter of 12 mm-14.5 mm.

3. The method of claim 1, wherein the high speed wire production line produces a commercial pure titanium wire. In step 3), after the wire drawing, the industrial pure titanium wire is not blown by the fan when passing through the Stelmor conveying line, and is air-cooled.

4. The method of claim 1, wherein the high speed wire production line produces a commercial pure titanium wire. The industrial pure titanium wire comprises pure titanium with the grades of TA1, TA2, TA3, TA4, TA5, TA6, TA7, TA8, TA9, TA10, TA13, TA15 and TA18; and the diameter of the industrial pure titanium wire is Ф6.5-Ф14.5 mm.

5. The method of producing an industrial pure titanium wire according to claim 1 or 4, wherein The allowable deviation of the wire produced by the method is that for the industrial pure titanium wire with the diameter of 6.5 mm≤10.0 mm, the diameter allowable deviation is ±0.25 mm, and the out-of-roundness is less than or equal to 0.4 mm; and for the industrial pure titanium wire with the diameter of 10.0 mm≤14.5 mm, the diameter allowable deviation is ±0.30 mm, and the out-of-roundness is less than or equal to 0.48 mm.

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