CN103397289A - Preparation method of TC4ELI titanium alloy bar - Google Patents
Preparation method of TC4ELI titanium alloy bar Download PDFInfo
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Abstract
The invention provides a preparation method of a TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 15mm-90mm. The invention also provides a preparation method of the TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) rolling; (5) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 8mm-15mm. The preparation method is simple in process, strong in repeatability and suitable for large-scale industrial production; the TC4ELI titanium alloy bar prepared by adopting the preparation method is uniform and fine in structure, high in microscopic structure level and excellent in mechanical property.
Description
Technical field
The invention belongs to the titanium alloy material technical field, be specifically related to a kind of preparation method of TC4ELI titanium alloy rod bar.
Background technology
At present, mainly adopt in the world TC4 titanium alloy (being Ti6Al4V) and TC4ELI titanium alloy (being Ti6Al4VELI) to prepare joint class and wound class orthopaedics implantation instrument, as aspects such as joint prosthesis, intramedullary needle, bone screw, tooth root implantation, Patella, hip joint and acetabular bones, especially low gap TC4ELI titanium alloy is most widely used.The microstructure that generally meets Srgery grafting titanium alloy material product requirement is A1 level～A9 level, and wherein the A1 level is organized the most tiny.In addition, research is found to organize the volume fraction of medium axle α phase more, and crystal grain is more tiny, and the TC4ELI alloy biomechanical property of acquisition is better, and this is also the target that pursue in medical TC4ELI alloy research and development field.
And the application of China biological medical titanium alloy TC4ELI and exploitation integral level are not high, the technique of commercial scale production is unstable, mainly owing to adopting conventional forging complete processing, its forging temperature is too high, the machining deformation amount is less, the forging mode is chosen improper and later stage straightening temperature and crossed high factor, cause the Φ that obtains 8mm～Φ 90mm TC4ELI titanium alloy rod bar not only microstructure thinning and aspect of performance batch less stable, also less Deng axle α phase volume fraction, crystal grain is not broken, and equi-axed crystal is thick.Simultaneously, the industrialization manufacturing procedure complexity of TC4ELI titanium alloy rod bar commonly used, with high costs, be difficult to the medical grade starting material that provide low-cost, high-quality.
Therefore, final purpose of the present invention is to improve uniform crystal particles and the mechanical property of TC4ELI titanium alloy rod bar, concrete grammar is to adopt the main process of optimizing or improving the medical grade bar, the acquisition equiaxed structure is even, the alloy bar material of grain refining, and this is also that the significant problem that solves is badly in need of in present TC4ELI titanium alloy field.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method of TC4ELI titanium alloy rod bar for above-mentioned the deficiencies in the prior art.Utilize the uniform crystal particles of TC4ELI titanium alloy rod bar prepared by the method tiny, the microstructure grading is high, good mechanical performance.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of TC4ELI titanium alloy rod bar, it is characterized in that, and the method comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described cogging is forged and is divided into 2～4 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃～200 ℃ of beta transformation point; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 410mm～1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm～550mm;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 100 ℃～120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃～35 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃～35 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 95mm～150mm;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain the work in-process bar; Described precision fork is divided into 1～2 fire and completes, and the initial forging temperature of every fire time precision fork is 850 ℃～960 ℃; Described work in-process bar is cylindrical bar, and its cross-sectional shape is 15mm～90mm;
Step 4, the bar of work in-process described in step 3 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 15mm～90mm.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the equipment of flat-die forging described in step 2 is air hammer, steam driven hammer or water pressure engine.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, upsetting pull described in step 2 is forged to radially cross upsetting pull and forges.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, it is characterized in that, in the final forging temperature that in the final forging temperature that in step 1, time cogging of every fire is forged, step 2, time upsetting pull of every fire is forged and step 3, the final forging temperature of every fire time precision fork all is not less than 700 ℃.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the temperature of anneal described in step 4 is 710 ℃～750 ℃, and the time of described anneal is 50min～80min; The temperature of described aligning is 400 ℃～500 ℃.
The present invention also provides the preparation method of another TC4ELI titanium alloy rod bar, it is characterized in that, the method comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described cogging is forged and is divided into 2～4 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃～200 ℃ of beta transformation point; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 410mm～1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm～550mm;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 100 ℃～120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃～35 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃～35 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 95mm～150mm;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described precision fork is divided into two fire and completes, and wherein the initial forging temperature of the first fire time precision fork is 900 ℃～960 ℃, and the initial forging temperature of the second fire time precision fork is 850 ℃～930 ℃; Described smart forging rod billet is the cylindrical bar base, and its diameter of section is 25mm～40mm;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to smart forging rod billet described in step 3, after air cooling, obtain the work in-process bar; It is 750 ℃～780 ℃ that the beginning of described rolling is rolled temperature, and described work in-process bar is cylindrical bar, and its diameter of section is 8mm～15mm;
Step 5, the bar of work in-process described in step 4 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 8mm～15mm.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the equipment of flat-die forging described in step 2 is air hammer, steam driven hammer or water pressure engine.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, upsetting pull described in step 2 is forged to radially cross upsetting pull and forges.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, it is characterized in that, in the final forging temperature that in the final forging temperature that in step 1, time cogging of every fire is forged, step 2, time upsetting pull of every fire is forged, step 3, the finishing temperature of rolling described in the final forging temperature of every fire time precision fork and step 4 all is not less than 700 ℃.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the temperature of anneal described in step 5 is 710 ℃～750 ℃, and the time of described anneal is 50min～80min; The temperature of described aligning is 400 ℃～500 ℃.
The present invention compared with prior art has the following advantages:
1, the present invention carries out large quantity research discovery by the resistance to deformation to the TC4ELI titanium alloy material, the initial forging temperature of cogging forging, upsetting pull forging and precision fork is higher, the resistance to deformation of TC4ELI titanium alloy material is less, more easily forge moulding, but the too high meeting of initial forging temperature causes the plasticity of TC4ELI titanium alloy material and descends, and causes because being out of shape in a large number and fracture or heat cracking occur; If initial forging temperature, near the fusing point of TC4ELI titanium alloy, can significantly reduce and very easily fracture due to the grain-boundary strength of TC4ELI titanium alloy material.In addition, owing to forging the main heat that produces in deformation process by the TC4ELI titanium alloy material, remain self temperature, final forging temperature is lower, viscous deformation is larger to organizing role, heap the crystal grain degree of crushing higher, but final forging temperature is too low, can make the TC4ELI titanium alloy material because plasticity is too low, produce a large amount of crackles.Therefore the present invention is by large quantity research, final optimization pass goes out rational initial forging temperature of each forging stage and final forging temperature, the TC4ELI titanium alloy material can kept under the condition of suitable plasticity heaping the crystal grain fragmentation, and in the crystal grain fragmentation, be conducive to generate the axle α such as a large amount of and reach mutually a small amount of nascent strip α phase, reduce simultaneously the generation of crackle;
2, the present invention finds by large quantity research, the forging times number of cogging forging, upsetting pull forging and precision fork and forging deformation amount for the interior tissue of improving the TC4ELI titanium alloy material, to reduce its ununiformity be vital.Increase along with the forging deformation amount, the ununiformity of TC4ELI titanium alloy material interior tissue lowers, but this attenuating speed tends towards stability along with the increase of forging deformation amount, the forging deformation amount increases, can make the crystal grain fragmentation more even, but deflection is excessive, can bring series of problems again, as low in economic efficiency, production cycle prolongation, oxidation defect and crackle obviously, degradation etc.Therefore, the present invention by forging the forging times in stage and the optimal control of forging deformation amount to each, make under the prerequisite that guarantees quality product, reduce to add showing tremendous enthusiasm time and the forging number of times as far as possible, final design goes out the preparation method of the rational TC4ELI titanium alloy rod bar of science, made TC4ELI titanium alloy rod bar homogeneous microstructure is tiny, good mechanical performance.
3, selecting suitable forging mode and forging equipment is one of the present invention's important content of improving TC4ELI titanium alloy material performance.Utilizing quick forging machine to carry out that cogging forges can broken bulk tissue, and can improve banded structure; On flat-die forging equipment, carry out the upsetting pull forging and not only make the tissue on forging surface be uniformly distributed, can also make the tissue of forging height of center line of segragation move on to skin, thereby make the segregation situation at forging middle part improve.The forging mode that the present invention preferably adopts radially cross upsetting pull to forge, make the forging centre portions have high segregation and organize and more easily move to outer surface, thereby can guarantee effectively that homogeneous microstructure is tiny, guarantees the superior in quality of TC4ELI titanium alloy rod bar.
4, the present invention is when preparing diameter of section and be the small-sized bar of 8mm～15mm, how fiery upsetting pull technology is combined with the rolling technique of aximal deformation value, effective fragmentation crystal grain, effectively eliminate the distortion dead band to organizing conforming impact, be conducive to improve the homogeneity of structure of TC4ELI titanium alloy rod bar, make its microstructure thinning degree compare with similar specification product and improved at least 1～2 rank.
5, the present invention adopts the lesser temps of 400 ℃～500 ℃ to align, and can effectively prevent growing up of crystal grain, guarantees the evenly tiny of tissue.
6, adopt TC4ELI titanium alloy rod bar prepared by the present invention etc. axle α phase volume fraction reach more than 70%, without lamella α phase boundling, generate, wait axle α crystal grain tiny evenly.Adopt TC4ELI titanium alloy rod bar and similar products at home and abroad prepared by the present invention to compare, its at unit elongation greater than 14%, relative reduction in area greater than 45% basis on, tensile strength is 989MPa～1152MPa, yield strength is 908MPa～1093MPa, microstructure is rated A1～A3 level, and the ultrasonic inspection rank is high.In addition, this TC4ELI titanium alloy rod bar has good biocompatibility, machinability and high erosion resistance, can be conveniently for the making of medicine equipment.
7, process window of the present invention is wide, and homogeneity of structure is easy to control, and batch stability improves greatly, product strength, toughness and plasticity good match.
8, preparation technology of the present invention is simple, and is repeatable strong, is suitable for large-scale industrial production.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
Embodiment 1
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 640mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 300mm; Described cogging is forged and is divided into 2 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 150 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 110 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 30 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 30 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 110mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 20mm; Described precision fork is divided into 2 fire and completes, wherein the initial forging temperature of the first fire time precision fork is 950 ℃, in the middle of after the first fire time precision fork, to be transformed into diameter of section be the cylindrical of 60mm to forging stock, the initial forging temperature of the second fire time precision fork is 880 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, the bar of work in-process described in step 3 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; The temperature of described aligning is 450 ℃, and the temperature of described anneal is 720 ℃, and the time of described anneal is 60min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 20mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 2
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 410mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm; Described cogging is forged and is divided into 3 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 180 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 35 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 35 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 95mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is steam driven hammer; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 15mm; Described precision fork is divided into 2 fire and completes, wherein the initial forging temperature of the first fire time precision fork is 930 ℃, in the middle of after the first fire time precision fork, to be transformed into diameter of section be the cylindrical of 50mm to forging stock, the initial forging temperature of the second fire time precision fork is 850 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, the bar of work in-process described in step 3 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; The temperature of described aligning is 480 ℃, and the temperature of described anneal is 710 ℃, and the time of described anneal is 50min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 15mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 3
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 950mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 480mm; Described cogging is forged and is divided into 2 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 200 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 125mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is water pressure engine; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 32mm; Described precision fork is divided into 2 fire and completes, wherein the initial forging temperature of the first fire time precision fork is 960 ℃, in the middle of after the first fire time precision fork, to be transformed into diameter of section be 68mm to forging stock, the initial forging temperature of the second fire time precision fork is 870 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, the bar of work in-process described in step 3 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; The temperature of described aligning is 500 ℃, and the temperature of described anneal is 720 ℃, and the time of described anneal is 70min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is the circle of 32mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 4
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 950mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 480mm; Described cogging is forged and is divided into 4 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 170 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 100 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 135mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 80mm; Described precision fork is divided into 1 fire and completes, and the initial forging temperature of described precision fork is 90 ℃, and the final forging temperature of described precision fork is not less than 700 ℃;
Step 4, the bar of work in-process described in step 3 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; The temperature of described aligning is 450 ℃, and the temperature of described anneal is 730 ℃, and the time of described anneal is 80min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 80mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 5
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 550mm; Described cogging is forged and is divided into 4 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 130 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 150mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is steam driven hammer; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 90mm; Described precision fork is divided into 1 fire and completes, and the initial forging temperature of described precision fork is 910 ℃, and the final forging temperature of described precision fork is not less than 700 ℃;
Step 4, the bar of work in-process described in step 3 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; The temperature of described aligning is 420 ℃, and the temperature of described anneal is 750 ℃, and the time of described anneal is 70min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 90mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 6
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 640mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 300mm; Described cogging is forged and is divided into 3 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 150 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 110 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 30 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 30 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and its length of side is 110mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is the cylindrical bar base, and its diameter of section is 25mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 900 ℃, in the middle of after the first fire time precision fork, to be transformed into diameter of section be the cylindrical of 60mm to forging stock, the initial forging temperature of the second fire time precision fork is 850 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to smart forging rod billet described in step 3, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 10mm; It is 780 ℃ that the beginning of described rolling is rolled temperature, and the finishing temperature of described rolling is not less than 700 ℃;
Step 5, the bar of work in-process described in step 4 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 10mm; 730 ℃ of the temperature of described anneal, the time of described anneal is 70min, the temperature of described aligning is 480 ℃.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 7
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 720mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 400mm; Described cogging is forged and is divided into 2 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 35 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 35 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and its length of side is 120mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is steam driven hammer; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is the cylindrical bar base, and its diameter of section is 30mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 950 ℃, in the middle of after the first fire time precision fork, to be transformed into diameter of section be the cylindrical of 65mm to forging stock, the initial forging temperature of the second fire time precision fork is 920 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to smart forging rod billet described in step 3, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 13mm; It is 760 ℃ that the beginning of described rolling is rolled temperature, and the finishing temperature of described rolling is not less than 700 ℃;
Step 5, the bar of work in-process described in step 4 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 13mm; The temperature of described anneal is 710 ℃, and the time of described anneal is 60min, and the temperature of described aligning is 450 ℃.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 8
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 410mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 260mm; Described cogging is forged and is divided into 2 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 200 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 35 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 35 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and its length of side is 95mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is water pressure engine; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is the cylindrical bar base, and its diameter of section is 25mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 900 ℃, in the middle of after the first fire time precision fork, forge that to be transformed into diameter of section be the cylindrical of 58mm, the initial forging temperature of the second fire time precision fork is 850 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to smart forging rod billet described in step 3, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 8mm; It is 750 ℃ that the beginning of described rolling is rolled temperature, and the finishing temperature of described rolling is not less than 700 ℃;
Step 5, the bar of work in-process described in step 4 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 8mm; The temperature of described anneal is 710 ℃, and the time of described anneal is 80min, and the temperature of described aligning is 400 ℃.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 9
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 1020mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 550mm; Described cogging is forged totally 4 fire and is completed, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃ of beta transformation point, and the final forging temperature that time cogging of every fire is forged all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and its length of side is 150mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is the cylindrical bar base, and its diameter of section is 40mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 960 ℃, in the middle of after the first precision fork, the cross-sectional shape of forging stock is that diameter is the circle of 70mm, the initial forging temperature of the second fire time precision fork is 930 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to smart forging rod billet described in step 3, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 15mm; It is 780 ℃ that the beginning of described rolling is rolled temperature, and the finishing temperature of described rolling is not less than 700 ℃;
Step 5, the bar of work in-process described in step 4 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 15mm; The temperature of described anneal is 750 ℃, and the time of described anneal is 50min, and the temperature of described aligning is 400 ℃.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
Embodiment 10
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 950mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 480mm; Described cogging is forged and is divided into 3 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 200 ℃ of beta transformation point, and the final forging temperature of the inferior cogging forging of every fire all is not less than 700 ℃;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, wherein the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 100 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and its length of side is 135mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is water pressure engine; Described upsetting pull is forged and is preferably radially cross upsetting pull, and the upsetting pull of described radially cross refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulling vertically again; The final forging temperature that time upsetting pull of every fire is forged all is not less than 700 ℃;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is the cylindrical bar base, and its diameter of section is 32mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 900 ℃, in the middle of after the first fire time precision fork, forge that to be transformed into diameter of section be the cylindrical of 65mm, the initial forging temperature of the second fire time precision fork is 850 ℃, and the final forging temperature of every fire time precision fork all is not less than 700 ℃;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to smart forging rod billet described in step 3, after air cooling, obtain the work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 13.5mm; It is 750 ℃ that the beginning of described rolling is rolled temperature, and the finishing temperature of described rolling is not less than 700 ℃;
Step 5, the bar of work in-process described in step 4 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 13.5mm; The temperature of described anneal is 710 ℃, and the time of described anneal is 80min, and the temperature of described aligning is 400 ℃.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in Table 1.
The performance test data of table 1 embodiment of the present invention 1 to 10TC4ELI titanium alloy rod bar
As shown in Table 1, the diameter of section specification of TC4ELI titanium alloy rod bar prepared by employing the present invention is 8mm～90mm, the tensile strength R under 25 ℃ of room temperature conditions
mFor 989MPa～1152MPa, yield strength R
AFor 908MPa～1093MPa, unit elongation A is 14%～17.5%, and relative reduction in area Z is 45%～53%, and microstructure is rated A1～A3 level, significantly is better than existing TC4ELI titanium alloy rod bar; TC4ELI titanium alloy rod bar excellent combination property prepared by the present invention is described thus.
The above, be only preferred embodiment of the present invention, not the present invention imposed any restrictions.Every any simple modification, change and equivalence of above embodiment being done according to the invention technical spirit changes, and all still belongs in the protection domain of technical solution of the present invention.
Claims (10)
1. the preparation method of a TC4ELI titanium alloy rod bar, is characterized in that, the method comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described cogging is forged and is divided into 2～4 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃～200 ℃ of beta transformation point; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 410mm～1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm～550mm;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 100 ℃～120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃～35 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃～35 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 95mm～150mm;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain the work in-process bar; Described precision fork is divided into 1～2 fire and completes, and the initial forging temperature of every fire time precision fork is 850 ℃～960 ℃; Described work in-process bar is cylindrical bar, and its diameter of section is 15mm～90mm;
Step 4, the bar of work in-process described in step 3 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 15mm～90mm.
2. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, is characterized in that, the equipment of flat-die forging described in step 2 is air hammer, steam driven hammer or water pressure engine.
3. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, is characterized in that, upsetting pull described in step 2 is forged to radially cross upsetting pull and forges.
4. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, it is characterized in that, in the final forging temperature that in the final forging temperature that in step 1, time cogging of every fire is forged, step 2, time upsetting pull of every fire is forged and step 3, the final forging temperature of every fire time precision fork all is not less than 700 ℃.
5. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, is characterized in that, the temperature of anneal described in step 4 is 710 ℃～750 ℃, and the time of described anneal is 50min～80min; The temperature of described aligning is 400 ℃～500 ℃.
6. the preparation method of a TC4ELI titanium alloy rod bar, is characterized in that, the method comprises the following steps:
Step 1, utilize quick forging machine to carry out the cogging forging to the TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described cogging is forged and is divided into 2～4 fiery inferior completing, and the initial forging temperature that time cogging of every fire is forged is above 100 ℃～200 ℃ of beta transformation point; Described TC4ELI titan alloy casting ingot is cylindrical ingot casting, and its diameter of section is 410mm～1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm～550mm;
Step 2, utilize flat-die forging equipment to carry out the upsetting pull forging to elementary forging stock described in step 1, forging stock in the middle of obtaining after water-cooled; Described upsetting pull is forged and is divided into 6 fiery inferior completing, the initial forging temperature of the 1st fiery time and the 2nd fiery time upsetting pull forging is above 100 ℃～120 ℃ of beta transformation point, with the initial forging temperature of the 4th fire time upsetting pull forging, be above 25 ℃～35 ℃ of beta transformation point the 3rd fiery time, the initial forging temperature of the 5th fiery time and the 6th fiery time upsetting pull forging is following 25 ℃～35 ℃ of beta transformation point; In the middle of described, the cross-sectional shape of forging stock is square, and the foursquare length of side is 95mm～150mm;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described precision fork is divided into two fire and completes, and wherein the initial forging temperature of the first fire time precision fork is 900 ℃～960 ℃, and the initial forging temperature of the second fire time precision fork is 850 ℃～930 ℃; Described smart forging rod billet is the cylindrical bar base, and its diameter of section is 25mm～40mm;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to smart forging rod billet described in step 3, after air cooling, obtain the work in-process bar; It is 750 ℃～780 ℃ that the beginning of described rolling is rolled temperature, and described work in-process bar is cylindrical bar, and its diameter of section is 8mm～15mm;
Step 5, the bar of work in-process described in step 4 is carried out to cutting to length, aligning and anneal successively, obtain the TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 8mm～15mm.
7. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 6, is characterized in that, the equipment of flat-die forging described in step 2 is air hammer, steam driven hammer or water pressure engine.
8. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 6, is characterized in that, upsetting pull described in step 2 is forged to radially cross upsetting pull and forges.
9. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 6, it is characterized in that, in the final forging temperature that in the final forging temperature that in step 1, time cogging of every fire is forged, step 2, time upsetting pull of every fire is forged, step 3, the finishing temperature of rolling described in the final forging temperature of every fire time precision fork and step 4 all is not less than 700 ℃.
10. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 6, is characterized in that, the temperature of anneal described in step 5 is 710 ℃～750 ℃, and the time of described anneal is 50min～80min; The temperature of described aligning is 400 ℃～500 ℃.
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