CN111906498A - Processing method of TA18 titanium alloy seamless pipe for bicycle frame - Google Patents
Processing method of TA18 titanium alloy seamless pipe for bicycle frame Download PDFInfo
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- CN111906498A CN111906498A CN202010550360.4A CN202010550360A CN111906498A CN 111906498 A CN111906498 A CN 111906498A CN 202010550360 A CN202010550360 A CN 202010550360A CN 111906498 A CN111906498 A CN 111906498A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
Abstract
The invention discloses a processing method of a TA18 titanium alloy seamless pipe for a bicycle frame, which comprises the following steps: (1) preparing a cast ingot; (2) preparing a bar blank; (3) preparing a tube blank; (4) selecting the specification of the tube blank; (5) surface treatment of the extruded tube blank; (6) cogging and cold rolling the tube blank; (7) rolling intermediate products and finished pipes; (8) annealing the intermediate product pipe; (9) surface finishing and processing of intermediate products and finished products; (10) annealing the finished product; (11) pickling a finished product; (12) flaw detection of the finished pipe; (13) inspecting the quality of a finished pipe, wherein the size of a bar blank prepared from the bar blank is as follows: phi 215-phi 220mm and phi 151-phi 155 mm. The TA18 alloy pipe prepared by the processing method of the TA18 titanium alloy seamless pipe for the bicycle frame can be used for preparing the bicycle frame, has the advantages of good surface quality, high dimensional precision, stable performance, good matching property of technological property and mechanical property, and the yield of the subsequently prepared bicycle frame can reach more than 98%.
Description
Technical Field
The invention relates to the technical field related to titanium alloy seamless pipe processing, in particular to a processing method of a TA18 titanium alloy seamless pipe for a bicycle frame.
Background
The titanium alloy material has light weight, high strength, good elasticity, and excellent impact resistance, fatigue resistance and corrosion resistance. Bicycles, particularly racing bicycles and the like, are required to be light in weight, good in rigidity and good in impact resistance because the light in weight can increase the speed and reduce physical strength consumption when they move over long distances; the frame with good rigidity is beneficial to the conversion of driving force and improves the operating performance; the vehicle frame with good shock absorption can better alleviate the shock from the ground, thereby relieving the fatigue of a driver. At present, the titanium alloy material widely used for the vehicle frame is TA18 (namely Gr9) alloy, has good formability and corrosion resistance, and has high yield strength, good process plasticity and excellent welding performance, such as:
the Chinese patent CN 108149066A discloses a novel titanium alloy Ti421 pipe for a bicycle and a processing method thereof, the invention solves the technical problem that the cold rolling processing deformation of the titanium alloy pipe with medium strength is easy to crack and is difficult to process, the strength is properly reduced on the basis of the TC4 alloy, but the plasticity is greatly improved, and the preparation cost is reduced. Compared with the written invention, although the application fields are the same, the strength levels of the two are different, the strength level of the tube material of the written invention is about 600MPa, and the strength level of the tube material of the written invention is more than 820 MPa;
chinese patent CN 107513638A discloses a method for preparing a high-strength titanium alloy pipe, which adopts a new alloy formula, realizes reasonable matching of strength index and plasticity index by adding alloy elements (Ti-43 novel titanium alloy) such as Al, V, Fe and the like with specific components, and produces the high-strength titanium alloy thin-wall pipe by cold rolling deformation. The strength of the novel alloy pipe produced by the invention is improved by 30% compared with that of TA18 pipe, and the novel alloy pipe can be used for bicycle frames. Compared with the invention written at this time, the invention aims to improve the strength of the pipe and enable the pipe to have high strength, and the invention written at this time aims to improve the comprehensive performance of the pipe, so that the control ranges of cold rolling parameters in the production process are different;
chinese patent CN 101451631A discloses a titanium alloy pipe special for petroleum exploration and a preparation process thereof, the invention has the advantages that the prepared pipe has high strength, high pressure resistance and long service life, but specific rolling process and straightening technology are not specified in the above technology. Compared with the invention written at this time, the finished pipes prepared by the two methods have different purposes, so the specific preparation process parameters are different;
chinese patent CN 1718798A discloses a formula and a process of a high-performance titanium alloy pipe, the formula of the invention is simpler, the performance of the prepared pipe is reliable, only lower processing temperature is needed after secondary annealing, the energy consumption is low, and the product precision is high. However, the patent does not specify a specific cold rolling process, a surface treatment method and a straightening technology;
chinese patent CN 109234555A discloses a method for preparing a small-caliber TA18 titanium alloy seamless pipe, and the method has the advantages of simple preparation process, short time consumption and effective cost saving. Compared with the invention written at this time, the invention only aims at the preparation of TA18 alloy pipes with small specification (the diameter is less than 25mm), and does not mention the specific performance indexes of the finished pipes.
Chinese patent CN 102909237A discloses a preparation method of a TA18 thick-wall pipe, which comprises ingot casting, forging, pipe blank preparation, surface treatment, rolling and straightening, wherein the production is carried out by adopting 1-3 passes of two-roller cold rolling, the surface quality is improved by adopting an internal boring and external polishing mode, and the straightness is ensured by adopting hot straightening. The invention can greatly shorten the product period, improve the surface quality and ensure the product straightness. Compared with the written invention, the invention adopts 500-600 ℃ hot straightening to ensure the straightness, which can cause the oxidation of the pipe to influence the surface quality, and the invention adopts cold straightening, so that the surface quality of the prepared finished pipe is superior to that of the invention.
Chinese patent CN 102974645A discloses a preparation process of a high-precision TA18 titanium alloy tube, which comprises the following steps: (1) preparing materials; (2) smelting; (3) performing repeated upsetting to form a titanium alloy bar blank; (4) rough rolling and finish rolling; (5) and (6) annealing. The TA18 alloy pipe produced by the method has the advantages of high yield, low production cost, high smoothness and high use value. Compared with the written invention, the invention mainly aims at the pipes with larger specifications, and the finish is mainly improved by finish rolling, but the invention utilizes the modes of finish rolling and polishing to improve the surface quality, and the surface quality of the finished product is superior to that of the pipe prepared by the invention.
Chinese patent CN 102389900A discloses a high-precision machining method of a TA18 aviation titanium tube, which comprises the following steps: 1. straightening the tube blank; 2. uniformly coating chlorinated paraffin-52 on the inner wall of the tube blank, filling a first mandrel into the tube blank, and rolling the tube blank into a required semi-finished tube; 3. taking out the first core rod in the semi-finished pipe, smearing chlorinated paraffin-52, then putting into the second core rod, and rolling into a pipe with the required size; 4. and repeating the step 3 for multiple times to obtain the TA18 aviation titanium pipe. The invention is realized by a cold rolling process, and has simple and feasible technology, lower cost and high dimensional precision. Compared with the written invention, the invention mainly prepares the high-strength (the tensile strength is more than or equal to 862MPa, the yield strength is more than or equal to 724MPa) pipe, and does not refer to specific cold rolling parameters and annealing process.
Chinese patent CN 105986144A discloses a titanium alloy TA18 seamless tube and a preparation method thereof, wherein the method comprises 9 modes of producing the TA18 seamless tube, such as hot perforation, hot rolling, hot perforation, cold rolling, hot perforation, hot rolling, hot top tube rolling, hot perforation, machine heating, hot extrusion, hot rolling, hot extrusion, cold rolling, hot extrusion, pipe jacking rolling, hot extrusion and machine heating, and the like, and the prepared tube has finer crystal grains and more compact structure. Compared with the tube prepared by the invention written at this time, the tube prepared by the invention has high strength (Rm is more than or equal to 900MPa), low plasticity (elongation after fracture is 10-15%), and different performance from the tube prepared by the invention written at this time.
Chinese patent CN 101934302A discloses a method for preparing a seamless titanium alloy pipe for an aircraft engine, which comprises the following steps: (1) smelting a titanium sponge ingot to introduce interstitial elements as little as possible; (2) heating the cast ingot to perform cogging forging with large deformation amount, and eliminating residual stress; (3) cogging and rolling with large deformation to refine grains; (4) annealing at lower temperature to control the growth of crystal grains. The alloy pipe produced by the invention (which is pure titanium from the aspect of component proportion) can meet the mechanical and technological properties required by materials for aircraft engines. Compared with the invention written at this time, the invention is mainly applied to aircraft engines, and the pipe material written at this time is mainly applied to vehicle frames, and the specific processing methods of the two and the performance indexes required by the finished pipe material are different due to different application fields.
Therefore, the existing TA18 alloy tube has poor surface quality, low dimensional precision and poor matching property of process performance and mechanical property, cracks are easy to appear in the forming process due to multi-pass drawing in the frame preparation, and stable batch production cannot be realized, so that the processing method of the TA18 titanium alloy seamless tube for the bicycle frame is provided, and the problems provided in the method are solved conveniently.
Disclosure of Invention
The invention aims to provide a processing method of a TA18 titanium alloy seamless pipe for a bicycle frame, which aims to solve the problems that most TA18 alloy pipes in the background technology have poor surface quality, low dimensional precision and poor matching of process performance and mechanical performance, cracks are easy to appear in the process of forming due to multi-pass drawing in the process of preparing the bicycle frame, and stable batch production cannot be realized.
In order to achieve the purpose, the invention provides the following technical scheme: a processing method of a TA18 titanium alloy seamless pipe for a bicycle frame comprises the following steps:
(1) preparing a cast ingot;
(2) preparing a bar blank;
(3) preparing a tube blank;
(4) selecting the specification of the tube blank;
(5) surface treatment of the extruded tube blank;
(6) cogging and cold rolling the tube blank;
(7) rolling intermediate products and finished pipes;
(8) annealing the intermediate product pipe;
(9) surface finishing and processing of intermediate products and finished products;
(10) annealing the finished product;
(11) pickling a finished product;
(12) flaw detection of the finished pipe;
(13) and (5) inspecting the quality of the finished pipe.
Preferably, the components of the ingot in the ingot preparation are as follows: sponge titanium and aluminum vanadium alloy are adopted to carry out batching and electrode block pressing according to the proportion of (Al is more than or equal to 2.5 percent and less than or equal to 3.0 percent, V is more than or equal to 1.5 percent and less than or equal to 2.5 percent, C is less than or equal to 0.05 percent, N is less than or equal to 0.03 percent, H is less than or equal to 0.015 percent, O is less than or equal to 0.12 percent, Fe is less than or equal to 0.30 percent, and the balance is Ti), the electrode block is combined and welded to prepare a primary electrode, and then vacuum consumable arc melting is carried out for.
Preferably, the size of the bar blank prepared by the bar blank is as follows: phi 215-phi 220mm and phi 151-phi 155mm, the addition of the machine-added peeling control unilateral machine is 2-5 mm, the flaw detection level reaches above A level, and the tissue is uniform.
Preferably, the preparation of the tube blank refers to drilling a deep hole drill for the optical rod blank, finely boring the inner wall of the tube blank, coating the inner part and the outer part by adopting double-sheath, heating at 860-920 ℃ for 1.5-2 h, respectively extruding the tube blank to a tube blank with a larger specification of phi 80-85 (+ -1) x (9-13) +/-1 mm and a tube blank with a smaller specification of phi 50-55 (+ -1) x (7-11) +/-0.8 mm, and finally removing the coated metal on the surface of the tube blank by an acid pickling method or an electrolytic method.
Preferably, the intermediate and finished pipe rolling refers to small pipe rolling, wherein:
tube rolling refers to: the intermediate product pipe is subjected to cold rolling by a 2-4-pass two-roller rolling mill, the pass processing rate is controlled to be 40% -60%, and the pass Q value (the ratio of the wall reduction rate to the diameter reduction rate) is controlled to be 1-1.5; and then cold rolling by a 1-2-pass multi-roll mill, wherein the pass processing rate is 30-40%, and the unilateral clearance between the core rod and the inner wall of the material is controlled to be 0.3-0.5 mm.
Preference is given toAnd (3) annealing the intermediate product pipe: annealing by adopting a vacuum annealing furnace, wherein the annealing temperature is 700-750 ℃, the heat preservation time is 60-180 min, and the vacuum degree of the annealing furnace is not lower than 3 multiplied by 10-2Pa。
Preferably, the finished product is annealed: annealing by using a vacuum annealing furnace, wherein the annealing temperature is 700-750 ℃, the heat preservation time is 60-90 min, and the vacuum degree of the annealing furnace is not lower than 5 multiplied by 10-2Pa。
Preferably, the requirements of the finished product acid washing are that the surface of the finished product pipe after acid washing is clean and bright, no oil dirt and impurities exist, acid washing pockmarks cannot appear, and water stains on the surface after water washing are wiped or blown dry in time.
Preferably, the dimensional accuracy, performance detection and surface quality required by the quality of the finished pipe respectively refer to:
dimensional accuracy: the tolerance of the outer diameter can reach D +/-0.1 mm, and the tolerance precision of the wall thickness can reach + 10% tmm (D is the outer diameter, t is the wall thickness);
room temperature mechanical property, surface roughness is less than or equal to 0.3 mu m; rm with the tensile strength of 520MPa or more and 600MPa or less, Rp0.2 with the yield strength of 420MPa or more and 500MPa or less, the elongation after fracture is more than or equal to 30 percent, Rp0.2 with the yield strength of 420MPa or more and 500MPa or less, and the elongation after fracture is more than or equal to 30 percent;
hardness of the finished product: the hardness is controlled to be 180-220 HV 1;
flaring rate: the flaring rate of the finished pipe is more than or equal to 40 percent;
surface quality: the finished pipe is clean and free of impurities, the inner surface and the outer surface of the pipe are free of scratches or scratches, the scratch depth is not more than 0.1mm, no visible harmful defects such as pits, folds, cracks, needle holes, peeling, bulges, wavy lines and the like exist, and the end part of the pipe is smooth and free of burrs.
Compared with the prior art, the invention has the beneficial effects that: according to the processing method of the TA18 titanium alloy seamless pipe for the bicycle frame, the size precision of the prepared pipe can reach 10% t, the comprehensive performance is excellent, the hardness of the finished pipe is controlled to be 180-220 HV1, the surface quality is good and the like by blending alloy components, selecting pipe blank specifications and controlling tolerance, controlling pass processing rate and Q value, and regulating and controlling a microstructure by a surface treatment process and heat treatment;
the TA18 alloy pipe prepared by proportioning the components of an ingot blank, forging with multiple times, preparing the pipe blank, cold rolling with two rollers and multiple rollers, surface treatment and annealing of an intermediate product pipe and ultrasonic flaw detection has the advantages of high dimensional precision, good surface quality, good matching of process performance (mainly flaring and flattening) and mechanical performance, stable batch production and capability of meeting the requirement that the yield of subsequent frame preparation reaches more than 98 percent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides a technical scheme that: a processing method of a TA18 titanium alloy seamless pipe for a bicycle frame comprises the following steps:
(1) preparing a cast ingot;
(2) preparing a bar blank;
(3) preparing a tube blank;
(4) selecting the specification of the tube blank;
(5) surface treatment of the extruded tube blank;
(6) cogging and cold rolling the tube blank;
(7) rolling intermediate products and finished pipes;
(8) annealing the intermediate product pipe;
(9) surface finishing and processing of intermediate products and finished products;
(10) annealing the finished product;
(11) pickling a finished product;
(12) flaw detection of the finished pipe;
(13) and (5) inspecting the quality of the finished pipe.
Furthermore, the components of the ingot in the ingot preparation are as follows: sponge titanium and aluminum vanadium alloy are adopted to carry out batching and electrode block pressing according to the proportion of (Al is more than or equal to 2.5 percent and less than or equal to 3.0 percent, V is more than or equal to 1.5 percent and less than or equal to 2.5 percent, C is less than or equal to 0.05 percent, N is less than or equal to 0.03 percent, H is less than or equal to 0.015 percent, O is less than or equal to 0.12 percent, Fe is less than or equal to 0.30 percent, and the balance is Ti), the electrode block is combined and welded to prepare a primary electrode, and then vacuum consumable arc melting is carried out for.
Further, the bar stock is prepared into the bar stock with the following sizes: phi 215-phi 220mm and phi 151-phi 155mm, the addition of the machine-added peeling control unilateral machine is 2-5 mm, the flaw detection level reaches above A level, and the tissue is uniform.
Further, the preparation of the tube blank refers to drilling the optical rod blank by using a deep hole drill, finely boring the inner wall of the tube blank, coating the inner part and the outer part by adopting double-sheathing, heating at 860-920 ℃ for 1.5-2 h, respectively extruding the tube blank to a tube blank with a larger specification of phi 80-85 (+ -1) x (9-13) +/-1 mm and a tube blank with a smaller specification of phi 50-55 (+ -1) x (7-11) +/-0.8 mm, and finally removing the coated metal on the surface of the tube blank by using an acid pickling method or an electrolytic method.
Further, intermediate and finished pipe rolling refers to small pipe rolling, wherein:
tube rolling refers to: the intermediate product pipe is subjected to cold rolling by a 2-4-pass two-roller rolling mill, the pass processing rate is controlled to be 40% -60%, and the pass Q value (the ratio of the wall reduction rate to the diameter reduction rate) is controlled to be 1-1.5; and then cold rolling by a 1-2-pass multi-roll mill, wherein the pass processing rate is 30-40%, and the unilateral clearance between the core rod and the inner wall of the material is controlled to be 0.3-0.5 mm.
Further, annealing the intermediate product pipe: annealing by adopting a vacuum annealing furnace, wherein the annealing temperature is 700-750 ℃, the heat preservation time is 60-180 min, and the vacuum degree of the annealing furnace is not lower than 3 multiplied by 10-2Pa。
Further, annealing the finished product: annealing by using a vacuum annealing furnace, wherein the annealing temperature is 700-750 ℃, the heat preservation time is 60-90 min, and the vacuum degree of the annealing furnace is not lower than 5 multiplied by 10-2Pa。
Furthermore, the requirements of the finished product acid washing are that the surface of the finished product pipe after acid washing is clean and bright, no oil stain or impurity exists, acid washing pockmarks cannot appear, and water stains on the surface after water washing are wiped or blown dry in time.
Furthermore, the dimensional accuracy, performance detection and surface quality required by the quality of the finished pipe respectively refer to:
dimensional accuracy: the tolerance of the outer diameter can reach D +/-0.1 mm, and the tolerance precision of the wall thickness can reach + 10% tmm (D is the outer diameter, t is the wall thickness);
room temperature mechanical property, surface roughness is less than or equal to 0.3 mu m; rm with the tensile strength of 520MPa or more and 600MPa or less, Rp0.2 with the yield strength of 420MPa or more and 500MPa or less, the elongation after fracture is more than or equal to 30 percent, Rp0.2 with the yield strength of 420MPa or more and 500MPa or less, and the elongation after fracture is more than or equal to 30 percent;
hardness of the finished product: the hardness is controlled to be 180-220 HV 1;
flaring rate: the flaring rate of the finished pipe is more than or equal to 40 percent;
surface quality: the finished pipe is clean and free of impurities, the inner surface and the outer surface of the pipe are free of scratches or scratches, the scratch depth is not more than 0.1mm, no visible harmful defects such as pits, folds, cracks, needle holes, peeling, bulges, wavy lines and the like exist, and the end part of the pipe is smooth and free of burrs.
Furthermore, the specification of the tube blank is selected as follows: the production of large tubes adopts large-specification tube blanks, and the production of small tubes adopts small tube blanks.
Further, surface treatment of the extruded tube blank: performing surface treatment on the prepared extruded tube blank or the tube blank subjected to cogging rolling for one pass, and boring the inner wall of the tube blank, wherein the boring amount of a single side is 0.3-1 mm, so that the inner wall is ensured to have no visible defects; peeling or scraping the outer surface, wherein the peeling amount or the scraping amount on one side is 0.3-1.5 mm.
Further, cogging and cold rolling of the tube blank: cogging by adopting a two-roller cold rolling pipe mill, pass processing rate is less than or equal to 40%, and feeding amount is 1-3 mm.
Surface quality of the finished pipe the following detailed description of the embodiments of the present invention is given with reference to examples. It should be understood that the examples are intended to illustrate the invention and are not intended to limit the invention. The scope and core content of the invention are to be determined by the claims.
Example 1 was carried out:
TA18 titanium alloy phi 39 multiplied by 1.4mm pipe rolling process:
the extruded tube blank is phi 84 multiplied by 11mm → phi 70 multiplied by 7mm → phi 54 multiplied by 4mm → phi 42 multiplied by 2.5mm → phi 39 multiplied by 1.4 mm;
annealing of intermediate products and finished products: annealing the intermediate product at 750 deg.C for 90 min; the annealing temperature of the finished product is 750 ℃, and the heat preservation time is 60 min.
Surface treatment: performing external-skimming and internal-boring on the pass of phi 70 multiplied by 7mm, wherein the unilateral boring amount is 0.3mm, and the skimming amount is 0.8 mm; and carrying out secondary boring treatment on the phi 42 multiplied by 2.5mm passes, wherein the unilateral boring amount is 0.25 mm.
The performance of the finished product is as follows: the roughness of the outer surface is 0.2 mu m, and the roughness of the inner surface is 0.3 mu m; the tensile strength Rm is 589MPa, the yield Rp0.2 is 445MPa, and the elongation is 32 percent at room temperature.
Hardness (HV 1): transverse 192 and longitudinal 202. The flaring rate reaches 60 percent.
The yield of the subsequently prepared frame reaches 98.3 percent.
Example 2 was carried out: TA18 titanium alloy phi 19 multiplied by 0.9mm pipe rolling process:
the extruded tube blank is phi 55 multiplied by 9mm → phi 40 multiplied by 6mm → phi 28 multiplied by 3mm → phi 21 multiplied by 1.5mm → phi 19 multiplied by 0.9 mm;
annealing of intermediate products and finished products: annealing the intermediate product at 750 deg.C for 60 min; the annealing temperature of the finished product is 700 ℃, and the heat preservation time is 90 min.
Surface treatment: performing external-skimming and internal-boring on phi 55 multiplied by 9mm passes, wherein the single-side boring amount is 0.5mm, and the skimming amount is 0.8 mm; and carrying out secondary boring treatment on the pass of phi 28 multiplied by 3mm, wherein the unilateral boring amount is 0.2 mm.
The performance of the finished product is as follows: the roughness of the outer surface is 0.2 mu m, and the roughness of the inner surface is 0.3 mu m; tensile strength Rm at room temperature is 592MPa, yield Rp0.2 is 482MPa, and elongation is 34.5%.
Hardness (HV 1): transverse 198 and longitudinal 210. The flaring rate reaches 40 percent.
The yield of the subsequently prepared frame reaches 98 percent.
Example 3 of implementation: TA18 titanium alloy phi 38.1 multiplied by 1.3mm pipe rolling process:
the cross piercing pipe blank is phi 84 multiplied by 11mm → phi 70 multiplied by 7mm → phi 54 multiplied by 4mm → phi 41 multiplied by 2mm → phi 38.1 multiplied by 1.3 mm;
annealing of intermediate products and finished products: annealing the intermediate product at 750 deg.C for 180 min; the annealing temperature of the finished product is 730 ℃, and the heat preservation time is 90 min.
Surface treatment: carrying out external scalping on the surface of a pass with the diameter of phi 84 multiplied by 11mm, wherein the scalping amount is 1.0 mm; boring in a pass of phi 70 multiplied by 7mm, wherein the unilateral boring amount is 1 mm; and carrying out secondary boring treatment on a pass with the diameter of 54 multiplied by 4mm, wherein the unilateral boring amount is 0.4 mm.
The performance of the finished product is as follows: the roughness of the outer surface is 0.2 mu m, and the roughness of the inner surface is 0.3 mu m; the tensile strength Rm is 582MPa, the yield Rp0.2 is 450MPa, and the elongation is 35 percent at room temperature.
Hardness (HV 1): transverse 199, longitudinal 205.
The flaring rate reaches 60 percent.
The yield of the subsequently prepared frame reaches 98.5 percent.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the record of the specification, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted, and the content which is not described in detail in the specification belongs to the prior art known by the professional in the field.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A processing method of a TA18 titanium alloy seamless pipe for a bicycle frame comprises the following steps:
(1) preparing a cast ingot;
(2) preparing a bar blank;
(3) preparing a tube blank;
(4) selecting the specification of the tube blank;
(5) surface treatment of the extruded tube blank;
(6) cogging and cold rolling the tube blank;
(7) rolling intermediate products and finished pipes;
(8) annealing the intermediate product pipe;
(9) surface finishing and processing of intermediate products and finished products;
(10) annealing the finished product;
(11) pickling a finished product;
(12) flaw detection of the finished pipe;
(13) and (5) inspecting the quality of the finished pipe.
2. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: the components of the cast ingot in the preparation of the cast ingot are as follows: sponge titanium and aluminum vanadium alloy are adopted to carry out batching and electrode block pressing according to the proportion of (Al is more than or equal to 2.5 percent and less than or equal to 3.0 percent, V is more than or equal to 1.5 percent and less than or equal to 2.5 percent, C is less than or equal to 0.05 percent, N is less than or equal to 0.03 percent, H is less than or equal to 0.015 percent, O is less than or equal to 0.12 percent, Fe is less than or equal to 0.30 percent, and the balance is Ti), the electrode block is combined and welded to prepare a primary electrode, and then vacuum consumable arc melting is carried out for.
3. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: the sizes of the prepared bar billets are as follows: phi 215-phi 220mm and phi 151-phi 155mm, the addition of the machine-added peeling control unilateral machine is 2-5 mm, the flaw detection level reaches above A level, and the tissue is uniform.
4. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: the tube blank preparation refers to drilling a light bar blank by using a deep hole drill, finely boring the inner wall of the tube blank, coating the inner part and the outer part by adopting double-sheath, heating at 860-920 ℃ for 1.5-2 h, respectively extruding the tube blank to a tube blank with a larger specification of phi 80-85 (+ -1) x (9-13) +/-1 mm and a tube blank with a smaller specification of phi 50-55 (+ -1) x (7-11) +/-0.8 mm, and finally removing the coated metal on the surface of the tube blank by using an acid pickling method or an electrolytic method.
5. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: the intermediate product and finished product pipe rolling refers to small pipe rolling, wherein:
tube rolling refers to: the intermediate product pipe is subjected to cold rolling by a 2-4-pass two-roller rolling mill, the pass processing rate is controlled to be 40% -60%, and the pass Q value (the ratio of the wall reduction rate to the diameter reduction rate) is controlled to be 1-1.5; and then cold rolling by a 1-2-pass multi-roll mill, wherein the pass processing rate is 30-40%, and the unilateral clearance between the core rod and the inner wall of the material is controlled to be 0.3-0.5 mm.
6. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: annealing the intermediate product pipe: annealing by adopting a vacuum annealing furnace, wherein the annealing temperature is 700-750 ℃, the heat preservation time is 60-180 min, and the vacuum degree of the annealing furnace is not lower than 3 multiplied by 10-2Pa。
7. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: annealing the finished product: annealing by adopting a vacuum annealing furnace, wherein the annealing temperature is 700-750 ℃, the heat preservation time is 60-90 min, and the vacuum degree of the annealing furnace is not lower than 5 multiplied by 10-2Pa。
8. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: the requirements of the finished product acid washing are that the surface of the finished product pipe after acid washing is clean and bright, no oil stain or impurity exists, acid washing pockmarks cannot appear, and water stains on the surface after water washing are wiped or blown dry in time.
9. The processing method of the TA18 titanium alloy seamless tube for the bicycle frame as claimed in claim 1, wherein: the dimensional accuracy, performance detection and surface quality required by the quality of the finished pipe respectively refer to:
dimensional accuracy: the tolerance of the outer diameter can reach D +/-0.1 mm, and the tolerance precision of the wall thickness can reach + 10% tmm (D is the outer diameter, t is the wall thickness);
room temperature mechanical property, surface roughness is less than or equal to 0.3 mu m; rm with the tensile strength of 520MPa or more and 600MPa or less, Rp0.2 with the yield strength of 420MPa or more and 500MPa or less, the elongation after fracture is more than or equal to 30 percent, Rp0.2 with the yield strength of 420MPa or more and 500MPa or less, and the elongation after fracture is more than or equal to 30 percent;
hardness of the finished product: the hardness is controlled to be 180-220 HV 1;
flaring rate: the flaring rate of the finished pipe is more than or equal to 40 percent;
surface quality: the finished pipe is clean and free of impurities, the inner surface and the outer surface of the pipe are free of scratches or scratches, the scratch depth is not more than 0.1mm, no visible harmful defects such as pits, folds, cracks, needle holes, peeling, bulges, wavy lines and the like exist, and the end part of the pipe is smooth and free of burrs.
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| CN114193097A (en) * | 2021-12-15 | 2022-03-18 | 西部新锆核材料科技有限公司 | Processing method for improving ultrasonic flaw detection qualification rate of titanium alloy ultra-long seamless pipe |
| CN115502212A (en) * | 2022-08-31 | 2022-12-23 | 中国科学院金属研究所 | GH2150 alloy seamless tube for limit rod of aero-engine shock absorber and rolling method |
| CN116005036A (en) * | 2022-12-30 | 2023-04-25 | 宝武特冶钛金科技有限公司 | Medium-strength impact-resistant titanium alloy with yield strength of 800MPa and preparation method of extruded tube of medium-strength impact-resistant titanium alloy |
| CN116005089A (en) * | 2022-12-14 | 2023-04-25 | 陕西宏远航空锻造有限责任公司 | Method for preparing TA18 titanium alloy large-size bar with high flaw detection level by short process |
| CN116656994A (en) * | 2023-07-25 | 2023-08-29 | 成都先进金属材料产业技术研究院股份有限公司 | Method for improving shrinkage strain ratio of TA18 titanium alloy seamless tube and TA18 titanium alloy seamless tube |
| CN117548520A (en) * | 2024-01-12 | 2024-02-13 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy seamless tube and method for improving plasticity of thin-wall titanium alloy seamless tube |
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| CN112719199A (en) * | 2020-12-14 | 2021-04-30 | 江苏尚吉亨通新材料有限公司 | Preparation method of large-caliber titanium alloy thick-wall pipe |
| CN114193097A (en) * | 2021-12-15 | 2022-03-18 | 西部新锆核材料科技有限公司 | Processing method for improving ultrasonic flaw detection qualification rate of titanium alloy ultra-long seamless pipe |
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| CN115502212A (en) * | 2022-08-31 | 2022-12-23 | 中国科学院金属研究所 | GH2150 alloy seamless tube for limit rod of aero-engine shock absorber and rolling method |
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| CN116005089A (en) * | 2022-12-14 | 2023-04-25 | 陕西宏远航空锻造有限责任公司 | Method for preparing TA18 titanium alloy large-size bar with high flaw detection level by short process |
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| CN116656994A (en) * | 2023-07-25 | 2023-08-29 | 成都先进金属材料产业技术研究院股份有限公司 | Method for improving shrinkage strain ratio of TA18 titanium alloy seamless tube and TA18 titanium alloy seamless tube |
| CN116656994B (en) * | 2023-07-25 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Method for improving shrinkage strain ratio of TA18 titanium alloy seamless tube and TA18 titanium alloy seamless tube |
| CN117548520A (en) * | 2024-01-12 | 2024-02-13 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy seamless tube and method for improving plasticity of thin-wall titanium alloy seamless tube |
| CN117548520B (en) * | 2024-01-12 | 2024-04-19 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy seamless tube and method for improving plasticity of thin-wall titanium alloy seamless tube |
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