CN114393052A - Production method of L-shaped inequilateral titanium alloy profile - Google Patents
Production method of L-shaped inequilateral titanium alloy profile Download PDFInfo
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- CN114393052A CN114393052A CN202210037929.6A CN202210037929A CN114393052A CN 114393052 A CN114393052 A CN 114393052A CN 202210037929 A CN202210037929 A CN 202210037929A CN 114393052 A CN114393052 A CN 114393052A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 43
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000012856 packing Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 22
- 238000000137 annealing Methods 0.000 claims description 21
- 239000002253 acid Substances 0.000 claims description 16
- 238000005488 sandblasting Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002161 passivation Methods 0.000 claims description 11
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- 238000005554 pickling Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims 1
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 23
- 239000011148 porous material Substances 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000001035 drying Methods 0.000 description 7
- 238000004321 preservation Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000012858 packaging process Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a production method of an L-shaped inequilateral titanium alloy profile. The production method of the L-shaped inequilateral titanium alloy section comprises the following steps: s1, selecting raw materials; s2, preheating the raw material, and rolling the raw material into inequilateral profiles by a phi 365 longitudinal 7-tandem mill train in a continuous pass mode after heating; s3, straightening the inequilateral section rolled and formed in the step S2 by tension; s4, cooling the inequilateral section bar processed in the step S3, and then carrying out fixed-length blanking processing; s5 performs a group packing process on the inequilateral profiles processed in step S4. According to the production method of the L-shaped inequilateral titanium alloy section, the rolled section can meet all performance indexes of important industries such as aviation, weapons, nuclear power and the like, the production process is simple and controllable, the yield of finished products can reach more than 88%, the main rolling mill runs in a full-automatic mode without manual operation, and important conditions of low cost and large-scale production are achieved.
Description
Technical Field
The invention relates to the field of section bar production, in particular to a production method of an L-shaped inequilateral titanium alloy section bar.
Background
With the continuous development and progress of society, the urgent needs of fields such as aviation, aerospace, electric power, weapons, maritime work equipment and chemical industry in the manufacturing industry for titanium alloy section bar products adopt an intelligent manufacturing method to replace the traditional manual production mode, break through the traditional manufacturing mode of titanium alloy section bars, and improve the production efficiency and the section bar quality, so that the method is very urgent.
At present, the hot-calendering processing of titanium alloy equilateral section bars in China still belongs to a starting stage, the traditional production mode is divided into two modes, the first mode is that titanium plates are bent, a bending machine is used for bending and processing the titanium alloy equilateral section bars into 90-degree right-angle unequal-sided section bars, the mode easily causes that the materials at right-angle parts are broken, the plate waste is overlarge in angle or slightly small, the precision cannot be controlled, the length of finished products is limited by the edge of the bending machine, and the R angle of the finished bent section bar products without meat supplement filling cannot meet the material application requirements.
The second one is extrusion molding by using an extruder, the extruded section has extremely high requirements on the power, load pressure and hole type grinding tool of the extrusion equipment, the extruded finished product is in a twist shape, the thickness allowance is increased to about 40 percent, only 3 to 4 meters of single length can be produced at home at present, the yield of the finished product is less than 60 percent, the waste is extremely high, and the requirement of the market on the section is far from being met.
Therefore, it is necessary to provide a method for producing an L-shaped inequilateral titanium alloy profile to solve the above technical problems.
Disclosure of Invention
The invention provides a production method of an L-shaped inequilateral titanium alloy profile, which solves the problem that the yield of inequilateral profiles needs to be further improved.
In order to solve the technical problem, the production method of the L-shaped inequilateral titanium alloy section provided by the invention comprises the following steps: s1, selecting raw materials;
s2, preheating the raw material, and rolling the raw material into inequilateral profiles by a phi 365 longitudinal 7-tandem mill train in a continuous pass mode after heating;
s3, straightening the inequilateral section rolled and formed in the step S2 by tension;
s4, cooling the inequilateral section bar processed in the step S3, and then carrying out fixed-length blanking processing;
s5, performing group packing processing on the inequilateral profiles processed in the step S4;
s6 stress relief annealing treatment is carried out on the inequilateral section bar processed in the step S5;
s7, performing sand blasting treatment on the inequilateral section subjected to stress relief annealing treatment in the step S6 by using a pass type sand blasting machine, and cleaning a surface oxide scale;
s8, carrying out acid cleaning passivation treatment on the surface of the inequilateral profile subjected to sand blasting treatment in the step S7;
s9, carrying out flaw detection on the inequilateral section subjected to acid cleaning and passivation treatment in the step S8 by using an ultrasonic flaw detector.
Preferably, in the step S1, a titanium alloy strip blank is selected as the raw material, and the size is δ 30 × 70 × 4000 mm.
Preferably, in the step S2, the blank is preheated to 930-950 ℃ by using a box electric furnace, and the size of the produced inequilateral profile is δ 4 × 50 × 32 × 24000 mm.
Preferably, the tension straightening processing in step S3 is performed by using the residual temperature of the rolled material in step S2, and the rolled material is conveyed to an on-line roller tension straightening machine through a roller way to be subjected to tension straightening.
Preferably, the material to be tension-straightened in the sizing blanking process in the step S4 is cooled and then is subjected to length sizing blanking by a band saw machine, and the size after blanking is δ 4 × 50 × 32 × 6000 mm.
Preferably, the group packaging process in step S5 uses a side-by-side back-attaching method to package about 250 pieces per package in 5 rows.
Preferably, in the step S6, the stress relief annealing treatment is performed by loading the packaged section into a pit annealing furnace and performing stress relief annealing at a temperature of 750 ℃.
Preferably, the straightness of the annealed section after unpacking reaches 1 mm/m.
Preferably, in the step S8, during the pickling and passivation treatment, the sandblasted section is placed in an acid tank for pickling and passivation, wherein the acid solution ratio is 15% nitric acid, 5% hydrofluoric acid, and the balance water, and the surface is pickled to silver gray.
Preferably, the flaw detection standard in the flaw detection processing in step S9 is class a, the medium is water, the flaw detection is qualified and finished product, and the flaw detection is unqualified and waste product.
Compared with the prior art, the production method of the L-shaped inequilateral titanium alloy section provided by the invention has the following beneficial effects:
the invention provides a method for producing an L-shaped inequilateral titanium alloy section, the rolled section can meet all performance indexes of key industries such as aviation, weapons, electric power, maritime work equipment and the like, the production process is simple and controllable, the yield of finished products can reach more than 88%, the main rolling mill runs in a full-automatic mode without manual operation, and the important conditions of low cost and large-scale production are achieved.
Drawings
FIG. 1 is a sectional view of a prepared section bar of the production method of the L-shaped inequilateral titanium alloy section bar provided by the invention;
FIG. 2 is a K1 pore pattern provided by the present invention;
FIG. 3 is a K2 pore pattern provided by the present invention;
FIG. 4 is a K3 pore pattern provided by the present invention;
FIG. 5 is a K4 pore pattern provided by the present invention;
FIG. 6 is a K5 pore pattern provided by the present invention;
FIG. 7 is a K6 pore pattern provided by the present invention;
FIG. 8 is a K7 pore pattern provided by the present invention;
FIG. 9 is a three-dimensional view of a transfer device used for transferring the preheated raw material in the method for producing the L-shaped inequilateral titanium alloy section bar;
FIG. 10 is a schematic view of the construction of the portion of the insulating cover shown in FIG. 9;
fig. 11 is a schematic structural view of the heat retaining cover shown in fig. 10 in a use state.
Reference numbers in the figures:
1. a support frame 11, a traveling wheel set 12 and a pushing handrail;
2. a limiting sliding shaft 21 and a fixed disc;
3. a heat-preserving cover;
4. a telescoping member;
5. a support table;
6. and a limiting sliding block.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10 and fig. 11 in combination, wherein fig. 1 is a sectional view of a prepared section bar of the method for producing an L-shaped inequilateral titanium alloy section bar according to the present invention; FIG. 2 is a K1 pore pattern provided by the present invention; FIG. 3 is a K2 pore pattern provided by the present invention; FIG. 4 is a K3 pore pattern provided by the present invention; FIG. 5 is a K4 pore pattern provided by the present invention; FIG. 6 is a K5 pore pattern provided by the present invention; FIG. 7 is a K6 pore pattern provided by the present invention; FIG. 8 is a K7 pore pattern provided by the present invention; FIG. 9 is a three-dimensional view of a transfer device used for transferring the preheated raw material in the method for producing the L-shaped inequilateral titanium alloy section bar; FIG. 10 is a schematic view of the construction of the portion of the insulating cover shown in FIG. 9; fig. 11 is a schematic structural view of the heat retaining cover shown in fig. 10 in a use state.
A production method of an L-shaped inequilateral titanium alloy profile comprises the following steps:
s1, selecting raw materials;
s2, preheating the raw material, and rolling the raw material into inequilateral profiles by a phi 365 longitudinal 7-tandem mill train in a continuous pass mode after heating;
s3, straightening the inequilateral section rolled and formed in the step S2 by tension;
s4, cooling the inequilateral section bar processed in the step S3, and then carrying out fixed-length blanking processing;
s5, performing group packing processing on the inequilateral profiles processed in the step S4;
s6 stress relief annealing treatment is carried out on the inequilateral section bar processed in the step S5;
s7, performing sand blasting treatment on the inequilateral section subjected to stress relief annealing treatment in the step S6 by using a pass type sand blasting machine, and cleaning a surface oxide scale;
s8, carrying out acid cleaning passivation treatment on the surface of the inequilateral profile subjected to sand blasting treatment in the step S7;
s9, carrying out flaw detection on the inequilateral section subjected to acid cleaning and passivation treatment in the step S8 by using an ultrasonic flaw detector.
In the step S1, a titanium alloy strip blank is selected when selecting the raw material, and the size is δ 30 × 70 × 4000 mm.
In the step S2, the blank is preheated to 930-950 ℃ by adopting a box type electric furnace, and the size of the produced inequilateral section is delta 4 multiplied by 50 multiplied by 32 multiplied by 24000 mm.
And in the tension straightening treatment in the step S3, the residual temperature of the material rolled in the step S2 is utilized, and the material is conveyed to an online roller type tension straightening machine through a roller way to be subjected to tension straightening.
And in the step S4, after the material after tension straightening is cooled during the fixed-length blanking process, performing length fixed-length blanking by using a band sawing machine, wherein the size of the blanked material is delta 4 multiplied by 50 multiplied by 32 multiplied by 6000 mm.
In the step S5, the group packaging process uses a side-by-side back-attaching method, wherein each bag has about 250 pieces and is arranged in 5 rows.
And in the step S6, stress relief annealing treatment is carried out, wherein the packaged section bar is put into a pit annealing furnace, and the temperature is 750 ℃ for stress relief annealing.
And the straightness of the annealed section bar after unpacking reaches 1 mm/m.
And in the step S8, during pickling and passivation, the section after sand blasting is placed in an acid tank for pickling and passivation, wherein the acid liquor comprises 15% of nitric acid, 5% of hydrofluoric acid and the balance of water, and the surface is pickled to silver gray.
And in the step S9, the standard of flaw detection is grade A, the medium is water, the qualified flaw detection is a finished product, and the unqualified flaw detection is a waste product.
By providing hot rolling and rolling processing technology, the semi-finished product of the section with the length of 24 meters per unit and the finished product of the section with the length of 6 meters per unit are produced, the yield of the finished product reaches over 88 percent, the surface of the section is glossy, and the section material has no cracks, slag inclusion, stable chemical components and standard mechanical properties.
Compared with the prior art, the production method of the L-shaped inequilateral titanium alloy section provided by the invention has the following beneficial effects:
the rolled section can meet all performance indexes of important industries such as aviation, weaponry, electric power, marine equipment, nuclear power and the like, the production process is simple and controllable, the yield of finished products can reach over 88 percent, the main rolling mill runs in a full-automatic manner without manual operation, and the important conditions of low cost and large-scale production are achieved.
In L type inequilateral titanium alloy section bar production method, the blank after the raw materials preheat needs the manual work to heat after the transportation of coming out of the furnace, when going out of the furnace and transporting, needs to use L type inequilateral titanium alloy panel transfer apparatus, include:
the walking wheel set comprises a support frame 1, wherein a walking wheel set 11 is installed at the bottom of the support frame 1, and a pushing handrail 12 is installed at the top of the support frame 1;
the bottom of the limiting sliding shaft 2 is fixedly arranged at the top of the support frame 1, and the top end of the limiting sliding shaft 2 is fixedly provided with a fixed disc 21;
the top of the heat-preservation cover 3 is fixedly arranged at the bottom of the fixed disc 21;
the bottom of the telescopic piece 4 is fixedly arranged at the top of the support frame 1;
the bottom of the support table 5 is fixedly arranged at the output end of the telescopic piece 4;
and the surface of the limiting sliding block 6 is fixedly arranged on the outer surface of the supporting table 5.
The walking wheel set 11 adopts a universal wheel structure and provides support for the walking of equipment, so that the whole walking and positioning of the support frame 1 are facilitated, and the stable transfer and adjustment of the blanks arranged above the support table 5 are facilitated;
the telescopic part 4 adopts a hydraulic telescopic cylinder, and is provided with hydraulic control equipment during use, the hydraulic control equipment adopts the prior art, is provided and installed at the bottom of the support frame 1 and is used for lifting regulation and control of the output end of the telescopic part 4, the support table 5 is conveniently and synchronously driven to carry out lifting regulation during the telescopic regulation of the output end of the telescopic part 4, and a mounting groove is formed above the support table 5 and is used for supporting and storing heated blanks;
the outer surface of the supporting table 5 is matched with the inner surface of the heat-insulating cover 3, and the supporting table 5 can be stably adjusted to the inside of the heat-insulating cover 3 when being adjusted up and down, so that the blank arranged above the supporting table 5 is conveniently lifted to the inside of the heat-insulating cover 3, the blank in the transportation process is conveniently subjected to heat-insulating treatment, the influence of the external environment on the blank after the temperature is raised is reduced, and the loss of the temperature of the blank in the transportation process is reduced;
drive brace table 5 through extensible member 4 and move down and adjust when getting the material, brace table 5 drives the blank and breaks away from the inside of heat preservation cover 3 to the convenience is got the material to the piece blank after transporting.
The surface of the limiting slide block 6 is connected with the surface of the limiting slide shaft 2 in a sliding mode, and support and limiting are provided for the lifting slide of the limiting slide block 6, so that the stability of the supporting table 5 during lifting adjustment is guaranteed.
When the heat preservation device is used, the heated blank is manually clamped to the position above the supporting table 5 in an opening state, the blank is kept to be positioned above the supporting table 5, the extensible part 4 is started, the extensible part 4 drives the supporting table 5 to move upwards, the supporting table 5 drives the heated blank to move towards the inside of the heat preservation cover 3, and after the blank moves to the inside of the heat preservation cover 3, the extensible part is closed, so that the stability in operation is guaranteed, the blank is prevented from falling off on one hand, the heat preservation effect is realized on the transported blank on the other hand, and the heat loss is reduced;
after transporting, start extensible member 4, extensible member 4 drives brace table 5 downstream, and brace table 5 drives the blank downstream above that for the blank breaks away from the inside of heat preservation cover 3, closes extensible member 4, and the artifical blank of transporting is got the material and is shifted over to the inside of automatic roll table after can.
Example 1:
a production method of an L-shaped inequilateral titanium alloy profile comprises the following production steps:
1. the raw material is a titanium alloy strip blank with a titanium alloy mark TA15, and the size is delta 30 multiplied by 70 multiplied by 4000 mm;
2. heating the blank to 950 ℃ by a box-type electric furnace, transferring the blank into an automatic roller way by adopting a manual discharging mode, continuously passing through a phi 365 tandem continuous rolling mill, sequentially passing through K7-K6-K5-K4-K3-K2-K1 hole patterns for rolling, and forming an L-shaped inequilateral section with the length of delta 4 multiplied by 50 multiplied by 24000mm at one step, wherein the working speed of the rolling mill is 5.5 m/s;
3. roller diameter proportioning mode table:
| serial number | Pass name | Diameter of upper roll mm | Diameter of lower roller mm | Speed of the |
| 1 | K7 | Φ360 | Φ360 | Concentric |
| 2 | K6 | Φ360 | Φ360 | Concentric |
| 3 | K5 | Φ360 | Φ360 | Concentric |
| 4 | K4 | Φ360 | Φ360 | Concentric |
| 5 | K3 | Φ360 | Φ345 | Concentric |
| 6 | K2 | Φ345 | Φ360 | Concentric different speeds |
| 7 | K1 | Φ360 | Φ345 | Concentric different speeds |
。
The working speed of the rolling mill is 5.5 m/s, and by using the arrangement mode of the rollers, the straightening force is applied to the blank among the K3, K2 and K1 hole patterns due to different speeds of the rollers when the blank is subjected to hot rolling plastic deformation, so that the straightness of the rolled section can reach within 2 mm/m.
4. Sawing into pieces with length of 6 m/piece by a band sawing machine, packaging by using a side-by-side back-attaching method, wherein about 250 pieces are packaged, 5 rows are arranged side by side, two pieces of steel plate strips with diameter of 20 steel screws and delta of 30mm are externally used for bundling the packaged pieces in a # -shape, the packaged pieces are fastened by steel nuts, 5 bundles of steel plates in a # -shape are bundled, and the interval between every two bundles of steel plates is 1 m.
5. And (4) stress relief annealing, namely loading the packaged section into a pit annealing furnace, heating to 750 ℃, stress relief annealing, keeping the temperature for 2 hours, discharging when the section is cooled to about 150 ℃ along with the furnace, and discharging and unpacking the section to obtain the straightness of 1 mm/m.
6. And (4) sand blasting by a through type sand blasting machine to clean the surface oxide skin.
7. Pickling and passivating the surface, namely pickling and passivating the sand-blasted section in an acid tank, wherein the acid liquor comprises 15 percent of nitric acid, 5 percent of hydrofluoric acid and the balance of water, soaking for about 15 minutes to show that the section is pickled to be silver gray, then washing the section by using clear water, and drying the section in a drying chamber at the room temperature of 60 ℃;
8. flaw detection is carried out by an ultrasonic flaw detector, the standard is grade A, the medium is water, the flaw detection is qualified and finished products are obtained, the flaw detection is unqualified and the finished products are waste products, and the finished products are placed in a drying room with the room temperature of 60 ℃ for drying after the flaw detection is finished;
9. after the processing by the production mode, an actual measurement value table of the mechanical properties of the L-shaped inequilateral profile finished product with the diameter of delta 4 multiplied by 50 multiplied by 32mm is obtained;
10. the dimensional thickness tolerance of the section bar meets +/-0.1 mm, the surface of the section bar is glossy, no crack, no inclusion, uniform tissue and no segregation, and the ultrasonic flaw detection meets the A-level standard.
Example 2:
a production method of an L-shaped inequilateral titanium alloy profile comprises the following production steps:
1. the raw material is titanium alloy plate strip blank with titanium alloy mark TC4, the size is delta 30 multiplied by 70 multiplied by 4000mm
2. Heating the blank to 930 ℃ by using a box type resistance furnace, transferring the blank into an automatic roller way by adopting a manual discharging mode, continuously rolling the blank by using a phi 365 tandem type continuous rolling mill in a pass-through mode, sequentially passing through K7-K6-K5-K4-K3-K2-K1 hole patterns for rolling, and forming the L-shaped inequilateral section with the length of delta 4 multiplied by 50 multiplied by 24000mm at one step, wherein the working speed of the rolling mill is 6 m/s.
3. Roller diameter proportioning mode table:
| serial number | Pass name | Diameter of upper roll mm | Diameter of lower roller mm | Speed of the |
| 1 | K7 | Φ360 | Φ360 | Concentric |
| 2 | K6 | Φ360 | Φ360 | Concentric |
| 3 | K5 | Φ360 | Φ360 | Concentric |
| 4 | K4 | Φ360 | Φ360 | Concentric |
| 5 | K3 | Φ360 | Φ345 | Concentric |
| 6 | K2 | Φ345 | Φ360 | Concentric different speeds |
| 7 | K1 | Φ360 | Φ345 | Concentric different speeds |
。
The working speed of the rolling mill is 6 m/s, the arrangement mode of the rollers is used, when the blank is subjected to hot rolling plastic deformation, the tension straightening force is applied to the blank among K3, K2 and K1 pass due to different speeds of the rollers, and the straightness of the rolled section can reach within 2 mm/m.
4. Sawing into pieces with length of 6 m/piece by a band sawing machine, packaging by using a side-by-side back-attaching method, wherein about 250 pieces are packaged, 5 rows are arranged side by side, two pieces of steel plate strips with diameter of 20 steel screws and delta of 30mm are externally used for bundling the packaged pieces in a # -shape, the packaged pieces are fastened by steel nuts, 5 bundles of steel plates in a # -shape are bundled, and the interval between every two bundles of steel plates is 1 m.
5. And (4) stress relief annealing, namely loading the packaged section into a pit annealing furnace, heating to 750 ℃, stress relief annealing, keeping the temperature for 2 hours, discharging when the section is cooled to about 150 ℃ along with the furnace, and discharging and unpacking the section to obtain the straightness of 1 mm/m.
6. And (4) sand blasting by a through type sand blasting machine to clean the surface oxide skin.
7. Pickling and passivating the surface, putting the section bar subjected to sand blasting into an acid tank for pickling and passivating, soaking the section bar in water for about 15 minutes, wherein the acid liquor comprises 15% of nitric acid, 5% of hydrofluoric acid and the balance of water, and the section bar is washed clean by clear water and then dried in a drying chamber at the room temperature of 60 ℃.
8. And (3) flaw detection is carried out by using an ultrasonic flaw detector, the standard is grade A, the medium is water, the flaw detection is qualified and finished products are obtained, the flaw detection is unqualified and the finished products are waste products, and the finished products are placed into a drying room with the room temperature of 60 ℃ for drying after the flaw detection is finished.
9. After the processing by the production mode, the actual measurement value table of the mechanical property of the L-shaped inequilateral profile finished product with the diameter of delta 4 multiplied by 50 multiplied by 32mm is as follows:
10. the dimensional thickness tolerance of the section bar meets +/-0.1 mm, the surface of the section bar is glossy, no crack, no inclusion, uniform tissue and no segregation, and the ultrasonic flaw detection meets the A-level standard.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The production method of the L-shaped inequilateral titanium alloy profile is characterized by comprising the following steps of:
s1, selecting raw materials;
s2, preheating the raw material, and rolling the raw material into inequilateral profiles by a phi 365 longitudinal 7-tandem mill train in a continuous pass mode after heating;
s3, straightening the inequilateral section rolled and formed in the step S2 by tension;
s4, cooling the inequilateral section bar processed in the step S3, and then carrying out fixed-length blanking processing;
s5, performing group packing processing on the inequilateral profiles processed in the step S4;
s6 stress relief annealing treatment is carried out on the inequilateral section bar processed in the step S5;
s7, performing sand blasting treatment on the inequilateral section subjected to stress relief annealing treatment in the step S6 by using a pass type sand blasting machine, and cleaning a surface oxide scale;
s8, carrying out acid cleaning passivation treatment on the surface of the inequilateral profile subjected to sand blasting treatment in the step S7;
s9, carrying out flaw detection on the inequilateral section subjected to acid cleaning and passivation treatment in the step S8 by using an ultrasonic flaw detector.
2. The method for producing an L-shaped inequilateral titanium alloy profile according to claim 1, wherein the titanium alloy strip blank is selected as the raw material in the step S1, and the size of the titanium alloy strip blank is δ 30 × 70 × 4000 mm.
3. The method for producing the L-shaped inequilateral titanium alloy profiles according to claim 1, wherein the blank is preheated in step S2 by heating to 930-950 ℃ in a box-type electric furnace, and the rolled inequilateral profiles have dimensions δ 4 × 50 × 32 × 24000 mm.
4. The method for producing an L-shaped inequilateral titanium alloy profile according to claim 1, wherein the tension straightening treatment in step S3 is carried out by using the residual temperature of the rolled material in step S2, and the rolled material is conveyed to an on-line roller tension straightening machine through a roller way to be subjected to tension straightening.
5. The method for producing an L-shaped inequilateral titanium alloy profile according to claim 1, wherein the length of the material to be straightened is cut to length by a band saw machine after the material is cooled in the process of cutting to length in step S4, and the size of the cut material is δ 4 × 50 × 32 × 6000 mm.
6. The method for producing L-shaped inequilateral titanium alloy profiles according to claim 1, wherein the group packing in step S5 uses a side-by-side back-attached method, each pack comprises about 250 pieces, and 5 rows are arranged in parallel.
7. The method for producing an L-shaped inequilateral titanium alloy profile according to claim 1, wherein the stress relief annealing treatment in step S6 is carried out by loading the packaged profile into a pit annealing furnace and performing stress relief annealing at a temperature of 750 ℃.
8. The method for producing an L-shaped inequilateral titanium alloy profile according to claim 7, wherein the straightness of the annealed profile after unpacking reaches a straightness of 1 mm/m.
9. The method for producing an L-shaped inequilateral titanium alloy sectional material according to claim 1, wherein in the step S8, the sandblasted sectional material is placed in an acid bath for pickling and passivation, and the acid solution is prepared by pickling the surface of the sectional material to silver gray with 15% nitric acid, 5% hydrofluoric acid and the balance water.
10. The method for producing an L-shaped inequilateral titanium alloy sectional material according to claim 1, wherein the flaw detection standard in the flaw detection treatment in step S9 is class a, the medium is water, the flaw detection is qualified as a finished product, and the flaw detection is unqualified as a waste product.
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| CN103008341A (en) * | 2012-12-12 | 2013-04-03 | 宝钛集团有限公司 | Titanium and titanium alloy bar hot continuous rolling production line and production process |
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| WO2019060566A1 (en) * | 2017-09-21 | 2019-03-28 | Ati Properties Llc. | Method for producing straightened beta-titanium alloy elongated product forms |
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