Grain refining processing method of titanium alloy tube blank for spinning

Abstract

The invention relates to the technical field of grain refinement processing, and discloses a grain refinement processing method of a titanium alloy pipe blank for spinning, which comprises the following specific process steps: S1, precise blank selection and pretreatment: selecting a titanium alloy cast ingot with low impurities and uniform components, deeply removing surface oxide skin and inclusions through a mechanical polishing and acid pickling composite means, and carrying out fine grinding on the titanium alloy cast ingot; the purity of the blank is ensured; s2, intelligently regulating and controlling multi-pass hot forging, specifically, an intelligent temperature control system is introduced, the temperature of a heating furnace is monitored in real time and precisely regulated and controlled, and it is ensured that the pipe blank is rapidly transferred to forging equipment when the pipe blank is heated to 1000 DEG C; s3, efficient channel extrusion co-processing is conducted, specifically, advanced equipment integrating heating and extrusion is adopted, and the pipe blank is seamlessly connected with the extrusion process under the precise heat preservation condition at the temperature of 925 DEG C; the corner of the die is optimized to 105 degrees, and the metal bears uniform and high-strength shearing force when flowing through the channel in cooperation with the parameter setting of the extrusion ratio of 5; s4, performing ultrasonic-rolling integrated processing; and S5, performing precise circulating heat treatment strengthening.

Description

Technical Field

[0001] The invention relates to the technical field of grain refinement, in particular to a grain refinement processing method for a titanium alloy tube blank for spinning. Background Art

[0002] With the rapid development of cutting-edge fields such as aerospace, high-end chemical industry and marine equipment, the demand for high-performance titanium alloy pipes has soared. There are many limitations in the traditional titanium alloy tube processing technology: ordinary annealing is difficult to completely eliminate the residual stress of the ingot, which makes subsequent processing prone to cracking and deformation; the deformation control during hot forging is rough, often resulting in uneven grain size and large fluctuations in the mechanical properties of the tube; conventional extrusion cannot make the metal evenly stressed, and the refinement effect is poor; rolling is prone to surface defects, reducing the yield rate; and the overall process consistency is poor, the production efficiency is low, and it is difficult to meet the high-end manufacturing industry's stringent requirements for high precision and high performance of materials. Industrial upgrading is imminent. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a method for refining the crystallization of titanium alloy tube billets for spinning, which has the advantages of improving the grain refining effect, ultra-high dimensional accuracy and surface quality, etc., and solves the problems that conventional extrusion cannot make the metal evenly stressed and the refining effect is poor; rolling is prone to surface defects and reduces the yield rate; and the overall process has poor consistency and low production efficiency, making it difficult to meet the high-end manufacturing industry's requirements for high-precision materials.

[0004] (II) Technical solution In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for fine grain processing of titanium alloy tube blanks for spinning, comprising the following specific process steps: S1 accurate blank selection and pretreatment: selecting titanium alloy ingots with low impurities and uniform composition, and deeply removing surface oxide scale and inclusions through mechanical grinding and pickling composite means to ensure the purity of the blank; S2 intelligent control of multi-pass hot forging: the introduction of intelligent temperature control system monitors and accurately controls the temperature of the heating furnace in real time to ensure that the tube billet is quickly transferred to the forging equipment when heated to 1000°C; S3 High-efficiency channel extrusion collaborative processing: using advanced equipment with integrated heating and extrusion, the tube billet seamlessly connects the extrusion process under precise heat preservation at 925°C; the die angle is optimized to 105°, and with the parameter setting of extrusion ratio 5, the metal is subjected to uniform and high-strength shear force when flowing through the channel; S4 Ultrasonic-rolling integrated processing: Upgrade the ultrasonic vibration and rolling equipment linkage system to achieve a stable output of 25kHz frequency and 4kW power, ensuring that the ultrasonic vibration is precisely synchronized with the rolling action; S5 precision cycle heat treatment enhancement: relying on the intelligent heat treatment production line, accurately execute the process of "first 800°C insulation for 1.2 hours, air cooling, then 650°C insulation for 2.5 hours, and slow cooling with the furnace".

[0005] Preferably, the S1 precision blank selection and pretreatment: after being cut into tube blanks of precise size, they are placed in a high-precision vacuum annealing furnace and annealed at a constant temperature of 850°C for 2.5 hours, with precise temperature control to eliminate residual stress and make the internal lattice structure of the blank regular.

[0006] Preferably, the S2 intelligently controls multiple hot forging passes: the deformation amount of the first forging pass is set to 18% according to the characteristics of the billet, and then with the help of big data analysis, the deformation amount is fine-tuned between 12% and 15% pass by pass, and the cumulative deformation amount is stabilized at 65%. The whole process follows the principle of "fewer blows and more forging", so that the grains are fully broken and evenly refined under multiple small impacts, thereby stimulating efficient dynamic recrystallization.

[0007] Preferably, the S3 high-efficiency channel extrusion collaborative treatment: on this basis, high-pressure inert gas is introduced to assist, enhance metal fluidity, promote full sliding and rotation of grain boundaries, refine grains to below 8μm, and simultaneously improve the density of the organizational structure.

[0008] Preferably, the S4 ultrasonic-rolling integrated processing: the vibration wave propagates evenly inside the metal, forming a coupling effect with the rolling stress, effectively reducing the deformation resistance by 30%, accelerating the annihilation of dislocations, greatly reducing surface microcracks, and improving the surface smoothness of the pipe.

[0009] Preferably, the S5 precision cycle heat treatment strengthening: utilizes the temperature and time data collected in real time for feedback adjustment, fully utilizes the phase change law, induces the precipitation of fine crystal nuclei, stabilizes the effect of grain refinement, comprehensively optimizes the strength, toughness and corrosion resistance of the titanium alloy tube blank, and meets the stringent requirements of high-end spinning technology.

[0010] (III) Beneficial effects Compared with the prior art, the present invention provides a method for fine grain processing of titanium alloy tube blank for spinning, which has the following beneficial effects: 1. The method for fine graining of titanium alloy tube billets for spinning has excellent grain refining effect: after precise coordinated processing of multiple links, the grain size of the titanium alloy tube billet is stably controlled below 8μm, and the fine and uniform grain structure significantly improves the strength and toughness of the material, with the yield strength increased by 20% - 30%, and the elongation increased by 15% - 20%, laying a solid foundation for the stable service of the tube under complex working conditions.

[0011] 2. The method for fine graining of titanium alloy tube billets for spinning can achieve ultra-high dimensional accuracy and surface quality: all-round control of processes such as billet pretreatment and ultrasonic-rolling integration can make the diameter tolerance of the tube billet accurate to ±0.1mm and the surface roughness Ra as low as below 0.8μm, which greatly reduces the subsequent spinning processing allowance, reduces costs, and meets the requirements of precision manufacturing.

[0012] 3. The method for fine-graining the titanium alloy tube billet for spinning significantly improves processing efficiency: intelligent control runs through the entire process, each link is seamlessly connected, and the production cycle is shortened by 30% - 40% compared with the traditional process, which efficiently meets the delivery of batch orders and enhances the company's market competitiveness; the equipment idle and debugging time is greatly compressed, and the energy utilization rate is increased by 25% - 35%.

[0013] 4. The method for fine-graining the titanium alloy billet for spinning. The finished product produced by this method has reliable performance stability: precise cyclic heat treatment stabilizes the microstructure, the corrosion resistance of the pipe is enhanced by 30% - 40%, and the high-temperature oxidation resistance is also significantly improved; the mechanical properties fluctuate little under complex stress and extreme environments, and the product defective rate is controlled within 2%, ensuring the safe operation of high-end equipment. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] The present invention provides a technical solution, specifically a method for fine-graining a titanium alloy tube blank for spinning, comprising the following specific process steps: S1 accurate blank selection and pretreatment: selecting titanium alloy ingots with low impurities and uniform composition, and deeply removing surface oxide scale and inclusions through mechanical grinding, pickling and other composite means to ensure the purity of the blank; Among them, after being cut into precise sizes, the tube billets are placed in a high-precision vacuum annealing furnace and annealed at a constant temperature of 850°C for 2.5 hours. The precise temperature control eliminates residual stress, makes the internal lattice structure of the billet regular, greatly improves the plastic deformation ability, and lays a good foundation for subsequent processing; S2 intelligent control of multi-pass hot forging: the introduction of intelligent temperature control system monitors and accurately controls the temperature of the heating furnace in real time to ensure that the tube billet is quickly transferred to the forging equipment when heated to 1000°C; The first forging process sets the deformation amount at 18% according to the characteristics of the blank. With the help of big data analysis, the deformation amount is fine-tuned between 12% and 15% in each process, and the cumulative deformation amount is stabilized at 65%. The whole process follows the principle of "fewer strikes and more forging", so that the grains are fully broken and evenly refined under multiple small impacts, stimulating efficient dynamic recrystallization; S3 High-efficiency equal channel extrusion collaborative processing: using advanced equipment with integrated heating and extrusion, the tube billet seamlessly connects the extrusion process under precise heat preservation at 925°C; the die angle is optimized to 105°, and with the parameter setting of extrusion ratio 5, the metal is subjected to uniform and high-strength shear force when flowing through the channel; On this basis, high-pressure inert gas is introduced to assist in enhancing metal fluidity, promoting full sliding and rotation of grain boundaries, refining grains to less than 8μm, and simultaneously improving the density of the organizational structure; S4 Ultrasonic-rolling integrated processing: Upgrade the ultrasonic vibration and rolling equipment linkage system to achieve a stable output of 25kHz frequency and 4kW power, ensuring that the ultrasonic vibration is precisely synchronized with the rolling action; Among them, the vibration wave propagates evenly inside the metal, forming a coupling effect with the rolling stress, effectively reducing the deformation resistance by 30%, accelerating the annihilation of dislocations, greatly reducing surface microcracks, and improving the surface smoothness of the pipe; S5 precision cycle heat treatment enhancement: relying on the intelligent heat treatment production line, accurately implement the process of "first 800°C insulation for 1.2 hours, air cooling, then 650°C insulation for 2.5 hours, slow cooling with the furnace"; Among them, the temperature and time data collected in real time are used for feedback adjustment, and the phase change law is fully utilized to induce the precipitation of fine crystal nuclei, consolidate the effect of grain refinement, and comprehensively optimize the strength, toughness and corrosion resistance of the titanium alloy tube billet to meet the stringent requirements of high-end spinning technology.

[0016] Furthermore, this method has an excellent grain refinement effect: after precise coordinated processing in multiple links, the grain size of the titanium alloy tube billet is stably controlled below 8μm. The fine and uniform grain structure significantly improves the material strength and toughness, with the yield strength increased by 20% - 30%, and the elongation increased by 15% - 20%, laying a solid foundation for the stable service of the tube under complex working conditions.

[0017] Furthermore, this method can achieve ultra-high dimensional accuracy and surface quality: all-round control of processes such as billet pretreatment and ultrasonic-rolling integration can make the diameter tolerance of the tube billet accurate to ±0.1mm and the surface roughness Ra as low as below 0.8μm, greatly reducing the subsequent spinning processing allowance, reducing costs, and meeting the requirements of precision manufacturing.

[0018] Furthermore, this method significantly improves processing efficiency: intelligent control runs through the entire process, each link is seamlessly connected, the production cycle is shortened by 30% - 40% compared with traditional processes, efficiently meeting batch order delivery and enhancing the company's market competitiveness; equipment idle and debugging time is greatly compressed, and energy utilization is increased by 25% - 35%.

[0019] Furthermore, the finished product produced by this method has reliable performance stability: precise cyclic heat treatment stabilizes the microstructure, the corrosion resistance of the pipe is enhanced by 30% - 40%, and the high-temperature oxidation resistance is also significantly improved; the mechanical properties fluctuate little under complex forces and extreme environments, and the product defective rate is controlled within 2%, ensuring the safe operation of high-end equipment. Although the embodiments of the present invention have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for fine graining of a titanium alloy tube for spinning, characterized in that: The process includes the following specific steps: S1 Precision Billet Selection and Pretreatment: Select titanium alloy ingots with low impurities and uniform composition, and use mechanical grinding and pickling to deeply remove surface oxide scale and inclusions to ensure the purity of the billet; S2 intelligent control of multi-pass hot forging: the introduction of intelligent temperature control system monitors and accurately controls the temperature of the heating furnace in real time to ensure that the tube billet is quickly transferred to the forging equipment when heated to 1000°C; S3 High-efficiency channel extrusion collaborative processing: using advanced equipment with integrated heating and extrusion, the tube billet seamlessly connects the extrusion process under precise heat preservation at 925°C; the die angle is optimized to 105°, and with the parameter setting of extrusion ratio 5, the metal is subjected to uniform and high-strength shear force when flowing through the channel; S4 Ultrasonic-rolling integrated processing: Upgrade the ultrasonic vibration and rolling equipment linkage system to achieve a stable output of 25kHz frequency and 4kW power, ensuring that the ultrasonic vibration is precisely synchronized with the rolling action; S5 precision cycle heat treatment enhancement: relying on the intelligent heat treatment production line, accurately implement the process of "first 800°C insulation for 1.2 hours, air cooling, then 650°C insulation for 2.5 hours, and slow cooling with the furnace".

2. The method for grain refinement of a titanium alloy tube blank for spinning according to claim 1, characterized in that: The S1 precision billet selection and pretreatment: After being cut into tube billets of precise size, they are placed in a high-precision vacuum annealing furnace and annealed at a constant temperature of 850°C for 2.5 hours. The residual stress is eliminated by precise temperature control to make the internal lattice structure of the billet regular.

3. The method for grain refinement of a titanium alloy tube for spinning according to claim 1, characterized in that: The S2 intelligently controls multiple hot forging passes: the first forging pass sets the deformation at 18% according to the characteristics of the billet, and subsequently, with the help of big data analysis, fine-tunes the deformation between 12% and 15% pass by pass, with the cumulative deformation stably reaching 65%. The whole process follows the principle of "fewer blows and more forging", allowing the grains to be fully broken and evenly refined under multiple small impacts, thereby stimulating efficient dynamic recrystallization.

4. The method for grain refinement of a titanium alloy tube blank for spinning according to claim 1, characterized in that: The S3 high-efficiency channel extrusion collaborative processing: on this basis, high-pressure inert gas assistance is introduced to enhance metal fluidity, promote full sliding and rotation of grain boundaries, refine grains to below 8μm, and simultaneously improve the density of the organizational structure.

5. The method for grain refinement of a titanium alloy tube blank for spinning according to claim 1, characterized in that: The S4 ultrasonic-rolling integrated processing: the vibration wave propagates evenly inside the metal, forming a coupling effect with the rolling stress, effectively reducing the deformation resistance by 30%, accelerating the annihilation of dislocations, greatly reducing surface microcracks, and improving the surface flatness of the pipe.

6. The method for grain refinement of a titanium alloy tube blank for spinning according to claim 1, characterized in that: The S5 precise cycle heat treatment strengthening: uses real-time collected temperature and time data feedback adjustment, fully utilizes the phase change law, induces the precipitation of fine crystal nuclei, stabilizes the effect of grain refinement, and comprehensively optimizes the strength, toughness and corrosion resistance of titanium alloy tube billets to meet the stringent requirements of high-end spinning processes.