CN116274798A - Manufacturing method for forging titanium alloy cast ingot - Google Patents
Manufacturing method for forging titanium alloy cast ingot Download PDFInfo
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- CN116274798A CN116274798A CN202310279369.XA CN202310279369A CN116274798A CN 116274798 A CN116274798 A CN 116274798A CN 202310279369 A CN202310279369 A CN 202310279369A CN 116274798 A CN116274798 A CN 116274798A
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- 238000005242 forging Methods 0.000 title claims abstract description 373
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims description 125
- 238000004321 preservation Methods 0.000 claims description 47
- 239000011521 glass Substances 0.000 claims description 19
- 229920000742 Cotton Polymers 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 abstract description 13
- 239000003795 chemical substances by application Substances 0.000 description 17
- 239000011248 coating agent Substances 0.000 description 15
- 238000000576 coating method Methods 0.000 description 15
- 238000001816 cooling Methods 0.000 description 15
- 238000005096 rolling process Methods 0.000 description 6
- 238000011143 downstream manufacturing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 229910000905 alloy phase Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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Abstract
The invention relates to a manufacturing method for forging a titanium alloy ingot, which comprises five forging processes of fires, wherein the forging fires and single forging ratio of blanks are reasonably arranged, so that the ingot blank can be forged into a titanium alloy forging stock meeting the use requirement, and the forging process can be completed only by five fires, thereby effectively reducing the production cost of the titanium alloy forging stock, reducing the loss of raw materials, saving energy sources and working hours and improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of forging and blank making of titanium alloy ingots, in particular to a manufacturing method for forging a titanium alloy ingot instead.
Background
The Ti-6Al-4V (TC 4) titanium alloy forged circle is an important raw material for manufacturing an aeroengine, and the material not only can meet the characteristics of high specific strength and light weight of aeroproducts on the material, but also has excellent comprehensive mechanical property and processability, and has been widely applied to the aeronautical field.
The titanium alloy forging stock is forged by the titanium alloy ingot blank, the process of forging the titanium alloy ingot in the prior art is mostly completed by seven to nine fires, the forging of more fires causes the increase of raw material loss, and the waste of energy and working hours is generated, thereby the production cost is improved, and the production efficiency is low.
Disclosure of Invention
The applicant provides a reasonable manufacturing method for forging titanium alloy ingot, aiming at the defects in the prior art, by reasonably arranging the forging heat and single forging ratio of the ingot, the ingot can be forged into a titanium alloy forging stock meeting the use requirement, and the forging process can be completed only by five heats, so that the production cost of the titanium alloy forging stock is effectively reduced, the loss of raw materials is reduced, the energy and the working hour are saved, and the production efficiency is improved.
The technical scheme adopted by the invention is as follows:
a manufacturing method for forging titanium alloy cast ingots comprises the following steps:
putting a blank of a titanium alloy ingot into heating equipment for heating;
forging a blank at a high temperature of 1050-1250 ℃ by first forging, wherein the final forging temperature is greater than or equal to 800 ℃, and after the blank is discharged from a furnace, performing two upsetting and two drawing, wherein the first upsetting forging ratio is greater than or equal to 2.0, the subsequent single upsetting forging ratio is 1.8, and when the blank is forged, the used tool is required to be preheated to 300 ℃, and when the blank is discharged from the furnace for forging, both end surfaces are covered with heat-insulating cotton;
forging a blank at 950-1100 ℃ for the second time, wherein the final forging temperature is greater than or equal to 800 ℃, the blank is subjected to two upsetting and two drawing after being discharged from a furnace, the single upsetting-drawing forging ratio is greater than 1.5, the used tool is required to be preheated to 300 ℃ during forging, and heat-insulating cotton is covered on two end surfaces during discharging and forging of the blank;
Forging at 1000-1200 ℃ for the third fire time, wherein the final forging temperature is more than or equal to 800 ℃, and the blank is subjected to two upsetting and two drawing after being discharged from the furnace, wherein each single forging ratio is 1.6;
forging the blank at 850-950 ℃ for the fourth time, wherein the final forging temperature is greater than or equal to 800 ℃, and the blank is subjected to two upsetting and two drawing after being discharged from the furnace, wherein each single forging ratio is 1.6;
forging the blank at 850-950 ℃ for the fifth fire time, wherein the final forging temperature is greater than or equal to 8-00 ℃, performing three upsetting four drawing after the blank is discharged from the furnace, controlling the single forging ratio within 1.6, and finally drawing the blank to a corresponding size according to the use requirement.
As a further improvement of the above technical scheme:
the first firing step is as follows:
after heating equipment is heated to 750 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and erecting, upsetting and shaping the blank by using the forging equipment, wherein the upsetting and forging ratio is 1.8;
turning the blank by 90 degrees, drawing the blank by using forging equipment, upsetting and drawing the forging ratio to be 1.8, chamfering the blank after drawing, and returning the blank to the furnace for heat preservation for 120min;
Taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the upsetting-pulling forging ratio is 1.8;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, upsetting and drawing the forging ratio to be 1.8, chamfering edges of the blank and flattening two end faces after drawing.
The second firing step is as follows:
after heating equipment is heated to 750 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the electric furnace, and using forging equipment to erect the blank for upsetting and shaping, wherein the upsetting ratio is more than 1.5;
then turning the blank by 90 degrees, using forging equipment to draw the blank, upsetting the blank to forge the blank to have a ratio greater than 1.5, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
then taking out the blank, and using forging equipment to erect the blank for upsetting, wherein the upsetting ratio is more than 1.5;
turning the blank by 90 degrees, drawing the blank by using forging equipment, upsetting the blank to forge the blank to have a ratio greater than 1.5, chamfering the blank edges and flattening the two end surfaces after drawing.
The third forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, drawing the blank by using forging equipment, and chamfering the blank edge with a single forging ratio of 1.6.
The fourth forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
Then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, and chamfering the blank edge after drawing.
The fifth forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
then turning the blank by 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, and chamfering the blank after drawing;
Then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, shaping and drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank edge after drawing, and returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
then taking the blank out of the heating equipment, and using the forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, and shaping and drawing the blank to the corresponding size according to the subsequent processing requirement.
The temperature of the blank needs to be strictly controlled in the whole forging process, and if the temperature of the blank is lower than the final forging temperature, the blank needs to be sent back to the heating equipment in time for heat preservation.
The blank needs to be pressed down at a constant speed during upsetting, the upsetting speed is 15mm/s-25mm/s, and tools used in the forging process need to be preheated to 250-400 ℃ in advance.
In the forging process, if cracks appear on the surface of the blank, the blank needs to be air-cooled and then repaired.
Before the blank is put into the heating equipment, sharp corners at two ends of the blank are rounded, and high-temperature glass agent needs to be smeared on the surface before the blank is put into the heating equipment.
The beneficial effects of the invention are as follows:
the invention is compact and reasonable, and convenient to operate, and can forge the ingot blank into the titanium alloy forging stock meeting the use requirement by reasonably arranging the forging firing time and single forging ratio of the blank, and the forging process can be completed only by five firing times, thereby effectively reducing the production cost of the titanium alloy forging stock, reducing the loss of raw materials, saving energy sources and working hours and improving the production efficiency.
The invention also has the following advantages:
(1) According to the invention, by reasonably controlling the upsetting speed of the forging equipment and the temperature of the tool used in the forging process, the risk of cracking and warping of the blank in the upsetting process is reduced.
(2) According to the invention, by strictly controlling the temperature of the blank, when the temperature of the blank is lower than the final forging temperature, the blank is returned to the heating equipment for heat preservation, so that the forging quality and the forging blank quality are ensured.
(3) According to the invention, the blank can be shaped and upsetted at the fifth firing time according to the subsequent use requirement to match the required size of the downstream process, so that the processing steps of the downstream process are reduced, and the production efficiency of the downstream process is improved.
(4) The forging stock manufactured by the invention is used for blanking production, the subsequent products can ensure flaw detection and metallographic structure of the products, the subsequent products can be free from upsetting and drawing, the loss of raw materials and the production period are reduced, and the production efficiency is improved.
Drawings
Fig. 1 is a graph showing the temperature rise during five-fire forging in the second embodiment of the present invention.
Fig. 2 is a graph showing the temperature rise during five-fire forging in the third embodiment of the present invention.
Fig. 3 is a golden phase diagram of a blank under a metallographic microscope at 100 times after the second hot forging in the third embodiment of the present invention.
Fig. 4 is a diagram of a second alloy phase of a blank under a metallographic microscope at 100 x after the second hot forging in the third embodiment of the present invention.
Fig. 5 is a diagram of a third alloy phase of a blank under a metallographic microscope at 100 x after the second hot forging in the third embodiment of the present invention.
Fig. 6 is a diagram of a fourth gold phase of a blank under a metallographic microscope at 100 x after the second hot forging in the third embodiment of the present invention.
Fig. 7 is a graph showing the temperature rise during five-fire forging in the fourth embodiment of the present invention.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
Embodiment one:
a manufacturing method for forging titanium alloy cast ingots comprises the following steps:
putting a blank of a titanium alloy ingot into heating equipment for heating;
forging a blank at a high temperature of 1050-1250 ℃ by adopting first firing, wherein the final forging temperature is greater than or equal to 800 ℃, and after the blank is discharged from a furnace, performing two upsetting and two drawing, wherein the first upsetting forging ratio is greater than or equal to 2.0, the subsequent single upsetting forging ratio is 1.8, the used tool is required to be preheated to 300 ℃ during forging, and the two end surfaces of the blank are covered with heat-insulating cotton during discharging and forging;
forging a blank at 950-1100 ℃ for the second time, wherein the final forging temperature is greater than or equal to 800 ℃, the blank is subjected to two upsetting and two drawing after being discharged from a furnace, the single upsetting-drawing forging ratio is greater than 1.5, the used tool is required to be preheated to 300 ℃ during forging, and heat-insulating cotton is covered on two end surfaces during discharging and forging of the blank;
Forging at 1000-1200 ℃ for the third fire time, wherein the final forging temperature is more than or equal to 800 ℃, and the blank is subjected to two upsetting and two drawing after being discharged from the furnace, wherein each single forging ratio is 1.6;
forging the blank at 850-950 ℃ for the fourth time, wherein the final forging temperature is greater than or equal to 800 ℃, and the blank is subjected to two upsetting and two drawing after being discharged from the furnace, wherein each single forging ratio is 1.6;
forging the blank at 850-950 ℃ for the fifth firing time, wherein the final forging temperature is greater than or equal to 800 ℃, performing three upsetting four drawing on the blank after discharging, controlling the single forging ratio within 1.6, and finally drawing the blank to a corresponding size according to the use requirement.
The first firing step is as follows:
after heating equipment is heated to 750 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and erecting, upsetting and shaping the blank by using the forging equipment, wherein the upsetting and forging ratio is 1.8;
turning the blank by 90 degrees, drawing the blank by using forging equipment, upsetting and drawing the forging ratio to be 1.8, chamfering the blank after drawing, and returning the blank to the furnace for heat preservation for 120min;
Taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the upsetting-pulling forging ratio is 1.8;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, upsetting and drawing the forging ratio to be 1.8, chamfering edges of the blank and flattening two end faces after drawing.
The second firing step is as follows:
after heating equipment is heated to 750 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the electric furnace, and using forging equipment to erect the blank for upsetting and shaping, wherein the upsetting ratio is more than 1.5;
then turning the blank by 90 degrees, using forging equipment to draw the blank, upsetting the blank to forge the blank to have a ratio greater than 1.5, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
then taking out the blank, and using forging equipment to erect the blank for upsetting, wherein the upsetting ratio is more than 1.5;
turning the blank by 90 degrees, drawing the blank by using forging equipment, upsetting the blank to forge the blank to have a ratio greater than 1.5, chamfering the blank edges and flattening the two end surfaces after drawing.
The third forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, drawing the blank by using forging equipment, and chamfering the blank edge with a single forging ratio of 1.6.
The fourth forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
Then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, and chamfering the blank edge after drawing.
The fifth forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
then turning the blank by 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, and chamfering the blank after drawing;
Then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, shaping and drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank edge after drawing, and returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
then taking the blank out of the heating equipment, and using the forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, and shaping and drawing the blank to the corresponding size according to the subsequent processing requirement.
The temperature of the blank needs to be strictly controlled in the whole forging process, and if the temperature of the blank is lower than the final forging temperature, the blank needs to be sent back to the heating equipment in time for heat preservation.
The blank needs to be pressed down at a constant speed during upsetting, the upsetting speed is 15mm/s-25mm/s, and tools used in the forging process need to be preheated to 250-400 ℃ in advance.
In the forging process, if cracks appear on the surface of the blank, the blank needs to be air-cooled and then repaired.
Before the blank is put into the heating equipment, sharp corners at two ends of the blank are rounded, and high-temperature glass agent needs to be smeared on the surface before the blank is put into the heating equipment. The high-temperature glass cement can enable the blank to be heated uniformly, and the risk of cracking of the blank is reduced.
The embodiment provides a reasonable manufacturing method for forging the titanium alloy cast ingot, and the forging process can be completed only by five fires through reasonably setting the forging temperature and the heat preservation time, so that the loss of raw materials is reduced, the working time is saved, and the production cost is greatly reduced.
Embodiment two:
the manufacturing method of forging the titanium alloy ingot provided in the first embodiment is used, the lower limit value of forging temperature parameters is selected, forging is performed on a titanium alloy ingot blank with the specification of phi 600 multiplied by 1560mm and the weight of 2000kg, a 4000T oil press is used as forging equipment, and an electric furnace is used as heating equipment;
as shown in fig. 1, the method comprises the following steps:
s1, putting a titanium alloy ingot blank into an electric furnace for heating;
s2, forging a blank at a high temperature of 1050 ℃ by adopting a first firing, wherein the final forging temperature is more than or equal to 800 ℃, and performing two upsetting and two drawing after the blank is discharged from a furnace, wherein the first upsetting forging ratio is more than or equal to 2.0, the subsequent single upsetting forging ratio is 1.8, the used tool is required to be preheated to 300 ℃ during forging, and heat-insulating cotton is covered on two end surfaces during the discharging and forging of the blank;
s2.1, coating a high-temperature glass agent on the surface of a blank before charging, after the electric furnace is heated to 750 ℃, placing the blank into the electric furnace, preserving heat for 80min, then quickly heating to a forging heating temperature along with the furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min, and in the embodiment, the first setting time is 250min;
S2.2, taking out the blank from the electric furnace, and vertically upsetting the blank to 800mm multiplied by 700mm (bottom side length multiplied by height) by using a 4000T oil press, wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s2.3, turning the blank over 90 degrees, drawing the blank to 600mm multiplied by 1230mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and then returning the blank to the furnace for heat preservation for 120min;
s2.4, taking out the blank, and using a 4000T oil press to vertically upsett the blank to 800mm multiplied by 700mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s2.5, turning the blank over for 90 degrees, drawing the blank to 600mm multiplied by 1150mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank side and flattening two end surfaces;
s2.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s3, forging a blank at 950 ℃ for the second time, wherein the final forging temperature is more than or equal to 800 ℃, and after the blank is discharged from the furnace, performing two upsetting and two drawing, wherein the single upsetting and drawing forging ratio is more than 1.5, the used tool is required to be preheated to 300 ℃ during forging, and the two end surfaces of the blank are covered with heat-insulating cotton during discharging and forging;
S3.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 100min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s3.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s3.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time, and in the embodiment, the second set time is 100min;
s3.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s3.5, turning the blank over for 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank side and flattening two end surfaces;
S3.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s4, forging at 1000 ℃ for the third time, wherein the final forging temperature is more than or equal to 800 ℃, and after the blank is discharged from the furnace, two upsetting and two drawing are performed, wherein each single forging ratio is 1.6;
s4.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 80min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s4.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s4.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and returning the blank to the furnace for heat preservation for a second set time which is 100 minutes;
s4.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
S4.5, turning the blank by 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank;
s4.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s5, forging a blank at 850 ℃ for the fourth time, wherein the final forging temperature is more than or equal to 800 ℃, and performing two upsetting and two drawing after the blank is discharged from a furnace, wherein each single forging ratio is 1.6;
s5.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 80min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s5.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s5.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and returning the blank to the furnace for heat preservation for a second set time which is 100 minutes;
s5.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
S5.5, turning the blank by 90 degrees, drawing the blank to 630mm multiplied by 1110mm (bottom side length multiplied by height) by using a 4000T oil press, and chamfering the blank;
s5.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s6, forging a blank at 850 ℃ and over 800 ℃ in a fifth fire time, performing three upsetting four drawing after the blank is discharged from a furnace, controlling the single forging ratio within 1.6, and finally drawing the blank to a corresponding size according to the use requirement;
s6.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 100min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s6.2, taking out the blank from the electric furnace, and vertically upsetting the blank to 800mm multiplied by 700mm (bottom side length multiplied by height) by using a 4000T oil press, wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s6.3, turning the blank by 90 degrees, drawing the blank to 630mm multiplied by 1110mm (bottom side length multiplied by height) by using a 4000T oil press, and chamfering the blank;
s6.4, using a 4000T oil press to vertically upset the blank to 800mm multiplied by 700mm (bottom side length multiplied by height), and upsetting the blank at a constant speed during upsetting, wherein the upsetting speed is 15mm/s-25mm/s;
S6.5, turning the blank for 90 degrees, rolling and drawing the blank to be phi 630mm multiplied by 1110mm by using a 4000T oil press, chamfering the edge of the blank, and returning the blank to the furnace for heat preservation for a second set time of 100 minutes;
s6.6, taking out the blank from the electric furnace, and using 4000T oil press to vertically upsett the blank to phi 800mm multiplied by 700mm, wherein the blank is upset at a constant speed, and the upsetting speed is 15mm/s-25mm/s
S6.7, turning the blank for 90 degrees, and rolling and drawing the blank to phi 500mm multiplied by 2260mm according to the subsequent processing requirements;
s6.8, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling.
After forging with five fires, the titanium alloy ingot blank is forged into a forged circle meeting the subsequent processing requirement, the forged circle is directly molded after upsetting and punching and is annealed at 750 ℃ to obtain the raw material meeting the use requirement, and the physical and chemical data of the raw material are as follows:
| tensile strength/Mpa (greater than or equal to 896) | Yield strength/Mpa (not less than 827) | Elongation A/% (. Gtoreq.10) | Shrinkage Z/% (. Gtoreq.25) |
| 912 | 850 | 10.5 | 32 |
| 923 | 885 | 13.0 | 40 |
As can be seen from the above table, after the forging process provided by the present embodiment, the ingot blank can be forged into a forging stock that meets the use requirements.
In the embodiment, taking a titanium alloy cast ingot with phi 600 multiplied by 1560mm as an example, the manufacturing method provided in the first embodiment is used, and the lower limit parameters in the parameter range provided in the first embodiment are used, so that the forged titanium alloy forged round meets the subsequent use requirements, and the lower limit parameters provided by the invention are proved to be reasonable.
Embodiment III:
the difference between the embodiment and the embodiment two is that the forging is performed by using the intermediate value of the forging temperature parameter;
as shown in fig. 2, the method comprises the following steps:
s1, putting a titanium alloy ingot blank into an electric furnace for heating;
s2, forging a blank at 1150 ℃ with a high temperature of 800 ℃ or more, discharging the blank, and then performing two upsetting and two drawing, wherein the first upsetting ratio is 2.0 or more, the subsequent single upsetting ratio is 1.8, the used tool is required to be preheated to 300 ℃ during forging, and the two end surfaces of the blank are covered with heat-insulating cotton during discharging and forging;
s2.1, coating a high-temperature glass agent on the surface of a blank before charging, after the electric furnace is heated to 750 ℃, placing the blank into the electric furnace, preserving heat for 80min, then quickly heating to a forging heating temperature along with the furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min, and in the embodiment, the first setting time is 250min;
S2.2, taking out the blank from the electric furnace, and vertically upsetting the blank to 800mm multiplied by 700mm (bottom side length multiplied by height) by using a 4000T oil press, wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s2.3, turning the blank over 90 degrees, drawing the blank to 600mm multiplied by 1230mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and then returning the blank to the furnace for heat preservation for 120min;
s2.4, taking out the blank, and using a 4000T oil press to vertically upsett the blank to 800mm multiplied by 700mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s2.5, turning the blank over for 90 degrees, drawing the blank to 600mm multiplied by 1150mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank side and flattening two end surfaces;
s2.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s3, forging a blank at 1000 ℃ for the second time, wherein the final forging temperature is more than or equal to 800 ℃, and after the blank is discharged from the furnace, performing two upsetting and two drawing, wherein the single upsetting and drawing forging ratio is more than 1.5, the used tool is required to be preheated to 300 ℃ during forging, and the two end surfaces of the blank are covered with heat-insulating cotton during discharging and forging;
S3.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 100min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s3.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s3.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time, and in the embodiment, the second set time is 100min;
s3.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s3.5, turning the blank over for 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank side and flattening two end surfaces;
S3.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s4, forging at 1100 ℃ for the third time, wherein the final forging temperature is more than or equal to 800 ℃, and after the blank is discharged from the furnace, two upsetting and two drawing are performed, wherein each single forging ratio is 1.6;
s4.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 80min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s4.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s4.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and returning the blank to the furnace for heat preservation for a second set time which is 100 minutes;
s4.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
S4.5, turning the blank by 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank;
s4.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s5, forging a blank at 900 ℃ for the fourth time, wherein the final forging temperature is more than or equal to 800 ℃, and after the blank is discharged from the furnace, two upsetting and two drawing are performed, wherein each single forging ratio is 1.6;
s5.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 80min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s5.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s5.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and returning the blank to the furnace for heat preservation for a second set time which is 100 minutes;
s5.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
S5.5, turning the blank by 90 degrees, drawing the blank to 630mm multiplied by 1110mm (bottom side length multiplied by height) by using a 4000T oil press, and chamfering the blank;
s5.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s6, forging a blank at 900 ℃ and over 800 ℃ in a fifth forging mode, performing three upsetting four drawing after the blank is discharged from a furnace, controlling the single forging ratio within 1.6, and finally drawing the blank to a corresponding size according to the use requirement;
s6.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 100min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s6.2, taking out the blank from the electric furnace, and vertically upsetting the blank to 800mm multiplied by 700mm (bottom side length multiplied by height) by using a 4000T oil press, wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s6.3, turning the blank by 90 degrees, drawing the blank to 630mm multiplied by 1110mm (bottom side length multiplied by height) by using a 4000T oil press, and chamfering the blank;
s6.4, using a 4000T oil press to vertically upset the blank to 800mm multiplied by 700mm (bottom side length multiplied by height), and upsetting the blank at a constant speed during upsetting, wherein the upsetting speed is 15mm/s-25mm/s;
S6.5, turning the blank for 90 degrees, rolling and drawing the blank to be phi 630mm multiplied by 1110mm by using a 4000T oil press, chamfering the edge of the blank, and returning the blank to the furnace for heat preservation for a second set time of 100 minutes;
s6.6, taking out the blank from the electric furnace, and using 4000T oil press to vertically upsett the blank to phi 800mm multiplied by 700mm, wherein the blank is upset at a constant speed, and the upsetting speed is 15mm/s-25mm/s
S6.7, turning the blank for 90 degrees, and rolling and drawing the blank to phi 500mm multiplied by 2260mm according to the subsequent processing requirements;
s6.8, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling.
As shown in fig. 3-6, the gold phase diagram of the blank under a metallographic microscope 100 times after the second hot forging meets the 00 grade of GB/T-6394 evaluation;
after forging with five fires, the titanium alloy ingot blank is forged into a forged circle meeting the subsequent processing requirement, the forged circle is directly molded after upsetting and punching and is annealed at 750 ℃ to obtain the raw material meeting the use requirement, and the physical and chemical data of the raw material are as follows:
| tensile strength/Mpa (greater than or equal to 896) | Yield strength/Mpa (not less than 827) | Elongation A/% (. Gtoreq.10) | Shrinkage Z/% (. Gtoreq.25) |
| 943 | 915 | 14.5 | 45 |
| 960 | 924 | 13.5 | 49 |
As can be seen from the above table and fig. 3 to 6, after the forging process provided in this embodiment, the ingot blank can be forged into a forging stock meeting the use requirement, and the physicochemical parameters of the forging stock are significantly enhanced as compared with the second embodiment by using the intermediate value of the forging temperature parameter.
In the embodiment, taking a titanium alloy ingot with phi 600 multiplied by 1560mm as an example, the manufacturing method provided in the first embodiment is used for reasonably setting process parameters according to the actual specification of a titanium alloy ingot blank, so that the number of fires is saved, the ingot forging process can be completed only by five fires, the forged circle meeting the use requirement is obtained, the processing steps of downstream processes can be reduced, the production efficiency is improved, and the production cost is greatly reduced.
Embodiment four:
the difference between the embodiment and the embodiment two is that the forging is performed by using the upper limit value of the forging temperature parameter;
as shown in fig. 7, the method comprises the following steps:
s1, putting a titanium alloy ingot blank into an electric furnace for heating;
s2, forging a blank at a high temperature of 1250 ℃ and at a final forging temperature of 800 ℃ or more, and performing two upsetting and two drawing after the blank is discharged from a furnace, wherein the first upsetting forging ratio is 2.0 or more, the subsequent single upsetting forging ratio is 1.8, the used tool is required to be preheated to 300 ℃ during forging, and heat-insulating cotton is covered on two end surfaces during discharging and forging of the blank;
S2.1, coating a high-temperature glass agent on the surface of a blank before charging, after the electric furnace is heated to 750 ℃, placing the blank into the electric furnace, preserving heat for 80min, then quickly heating to a forging heating temperature along with the furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min, and in the embodiment, the first setting time is 250min;
s2.2, taking out the blank from the electric furnace, and vertically upsetting the blank to 800mm multiplied by 700mm (bottom side length multiplied by height) by using a 4000T oil press, wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s2.3, turning the blank over 90 degrees, drawing the blank to 600mm multiplied by 1230mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and then returning the blank to the furnace for heat preservation for 120min;
s2.4, taking out the blank, and using a 4000T oil press to vertically upsett the blank to 800mm multiplied by 700mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s2.5, turning the blank over for 90 degrees, drawing the blank to 600mm multiplied by 1150mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank side and flattening two end surfaces;
S2.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s3, forging a blank at 1100 ℃ for the second time, wherein the final forging temperature is more than or equal to 800 ℃, and after the blank is discharged from the furnace, performing two upsetting and two drawing, wherein the single upsetting and drawing forging ratio is more than 1.5, the used tool is required to be preheated to 300 ℃ during forging, and the two end surfaces of the blank are covered with heat-insulating cotton during discharging and forging;
s3.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 100min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s3.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s3.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time, and in the embodiment, the second set time is 100min;
S3.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s3.5, turning the blank over for 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank side and flattening two end surfaces;
s3.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s4, forging at 1200 ℃ for the third fire time, wherein the final forging temperature is more than or equal to 800 ℃, and after the blank is discharged from the furnace, two upsetting and two drawing are performed, wherein each single forging ratio is 1.6;
s4.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 80min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s4.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s4.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and returning the blank to the furnace for heat preservation for a second set time which is 100 minutes;
S4.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s4.5, turning the blank by 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank;
s4.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s5, forging a blank at 950 ℃ for the fourth fire time, wherein the final forging temperature is more than or equal to 800 ℃, and performing two upsetting and two drawing after the blank is discharged from a furnace, wherein each single forging ratio is 1.6;
s5.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 80min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s5.2, taking out the blank from the electric furnace, and using a 4000T oil press to vertically upsetting the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s5.3, turning the blank over 90 degrees, drawing the blank to 650mm multiplied by 1050mm (bottom side length multiplied by height) by using a 4000T oil press, chamfering the blank, and returning the blank to the furnace for heat preservation for a second set time which is 100 minutes;
S5.4, taking out the blank, and using a 4000T oil press to vertically upset the blank to 830mm multiplied by 645mm (bottom side length multiplied by height), wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
s5.5, turning the blank by 90 degrees, drawing the blank to 630mm multiplied by 1110mm (bottom side length multiplied by height) by using a 4000T oil press, and chamfering the blank;
s5.6, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling;
s6, forging a blank at 950 ℃ for the fifth fire time, wherein the final forging temperature is more than or equal to 800 ℃, performing three upsetting four drawing after the blank is discharged from a furnace, controlling the single forging ratio within 1.6, and finally drawing the blank to a corresponding size according to the use requirement;
s6.1, coating a high-temperature glass agent on the surface of the blank before charging, placing the blank into an electric furnace after the electric furnace is heated to 800 ℃, preserving heat for 100min, and then quickly heating to a forging heating temperature along with the furnace, wherein the first set time of heat preservation is 250min;
s6.2, taking out the blank from the electric furnace, and vertically upsetting the blank to 800mm multiplied by 700mm (bottom side length multiplied by height) by using a 4000T oil press, wherein the blank is upset at a constant speed during upsetting, and the upsetting speed is 15mm/s-25mm/s;
S6.3, turning the blank by 90 degrees, drawing the blank to 630mm multiplied by 1110mm (bottom side length multiplied by height) by using a 4000T oil press, and chamfering the blank;
s6.4, using a 4000T oil press to vertically upset the blank to 800mm multiplied by 700mm (bottom side length multiplied by height), and upsetting the blank at a constant speed during upsetting, wherein the upsetting speed is 15mm/s-25mm/s;
s6.5, turning the blank for 90 degrees, rolling and drawing the blank to be phi 630mm multiplied by 1110mm by using a 4000T oil press, chamfering the edge of the blank, and returning the blank to the furnace for heat preservation for a second set time of 100 minutes;
s6.6, taking out the blank from the electric furnace, and using 4000T oil press to vertically upsett the blank to phi 800mm multiplied by 700mm, wherein the blank is upset at a constant speed, and the upsetting speed is 15mm/s-25mm/s
S6.7, turning the blank for 90 degrees, and rolling and drawing the blank to phi 500mm multiplied by 2260mm according to the subsequent processing requirements;
s6.8, in the forging process, if cracks appear on the surface of the blank, repairing the blank after air cooling.
After forging with five fires, the titanium alloy ingot blank is forged into a forged circle meeting the subsequent processing requirement, the forged circle is directly molded after upsetting and punching and is annealed at 750 ℃ to obtain the raw material meeting the use requirement, and the physical and chemical data of the raw material are as follows:
| Tensile strength/Mpa (greater than or equal to 896) | Yield strength/Mpa (not less than 827) | Elongation A/% (. Gtoreq.10) | Shrinkage Z/% (. Gtoreq.25) |
| 943 | 915 | 14.5 | 45 |
| 960 | 924 | 13.5 | 49 |
As can be seen from the above table, after the forging process provided by the present embodiment, the ingot blank can be forged into a forging stock meeting the use requirement, and the physical and chemical parameters of the forging stock are significantly enhanced in tensile strength and elongation as compared with the second embodiment by using the upper limit value of the forging temperature parameter.
In the embodiment, taking a titanium alloy cast ingot with phi 600 multiplied by 1560mm as an example, the manufacturing method provided by the first embodiment is used, and the upper limit parameter in the parameter range provided by the first embodiment is used, so that the forged titanium alloy forged round meets the subsequent use requirement, and the forging temperature parameter range provided by the invention is reasonable.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.
Claims (10)
1. A manufacturing method for forging titanium alloy cast ingots is characterized by comprising the following steps: the method comprises the following steps:
putting a blank of a titanium alloy ingot into heating equipment for heating;
forging a blank at a high temperature of 1050-1250 ℃ by first forging, wherein the final forging temperature is greater than or equal to 800 ℃, and after the blank is discharged from a furnace, performing two upsetting and two drawing, wherein the first upsetting forging ratio is greater than or equal to 2.0, the subsequent single upsetting forging ratio is 1.8, and when the blank is forged, the used tool is required to be preheated to 300 ℃, and when the blank is discharged from the furnace for forging, both end surfaces are covered with heat-insulating cotton;
Forging a blank at 950-1100 ℃ for the second time, wherein the final forging temperature is greater than or equal to 800 ℃, the blank is subjected to two upsetting and two drawing after being discharged from a furnace, the single upsetting-drawing forging ratio is greater than 1.5, the used tool is required to be preheated to 300 ℃ during forging, and heat-insulating cotton is covered on two end surfaces during discharging and forging of the blank;
forging at 1000-1200 ℃ for the third fire time, wherein the final forging temperature is more than or equal to 800 ℃, and the blank is subjected to two upsetting and two drawing after being discharged from the furnace, wherein each single forging ratio is 1.6;
forging the blank at 850-950 ℃ for the fourth time, wherein the final forging temperature is greater than or equal to 800 ℃, and the blank is subjected to two upsetting and two drawing after being discharged from the furnace, wherein each single forging ratio is 1.6;
forging the blank at 850-950 ℃ for the fifth fire time, wherein the final forging temperature is greater than or equal to 8-00 ℃, performing three upsetting four drawing after the blank is discharged from the furnace, controlling the single forging ratio within 1.6, and finally drawing the blank to a corresponding size according to the use requirement.
2. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: the first firing step is as follows:
after heating equipment is heated to 750 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
Then taking out the blank from the heating equipment, and erecting, upsetting and shaping the blank by using the forging equipment, wherein the upsetting and forging ratio is 1.8;
turning the blank by 90 degrees, drawing the blank by using forging equipment, upsetting and drawing the forging ratio to be 1.8, chamfering the blank after drawing, and returning the blank to the furnace for heat preservation for 120min;
taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the upsetting-pulling forging ratio is 1.8;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, upsetting and drawing the forging ratio to be 1.8, chamfering edges of the blank and flattening two end faces after drawing.
3. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: the second firing step is as follows:
after heating equipment is heated to 750 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the electric furnace, and using forging equipment to erect the blank for upsetting and shaping, wherein the upsetting ratio is more than 1.5;
then turning the blank by 90 degrees, using forging equipment to draw the blank, upsetting the blank to forge the blank to have a ratio greater than 1.5, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
Then taking out the blank, and using forging equipment to erect the blank for upsetting, wherein the upsetting ratio is more than 1.5;
turning the blank by 90 degrees, drawing the blank by using forging equipment, upsetting the blank to forge the blank to have a ratio greater than 1.5, chamfering the blank edges and flattening the two end surfaces after drawing.
4. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: the third forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, drawing the blank by using forging equipment, and chamfering the blank edge with a single forging ratio of 1.6.
5. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: the fourth forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
turning over the blank for 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank after drawing, and then returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
taking out the blank, and then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, and chamfering the blank edge after drawing.
6. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: the fifth forging step is as follows:
after heating equipment is heated to 800 ℃, placing the blank into the heating equipment, preserving heat for 60-120 min, then quickly heating to a forging heating temperature along with a furnace, preserving heat for a first set time, wherein the first set time is obtained by calculating the wall thickness of the blank: the wall thickness is multiplied by 0.4 to 0.6min;
Then taking out the blank from the heating equipment, and using the forging equipment to erect, upsetting and shape the blank, wherein the single forging ratio is 1.6;
then turning the blank by 90 degrees, drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, and chamfering the blank after drawing;
then using forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, shaping and drawing the blank by using forging equipment, wherein the single forging ratio is 1.6, chamfering the blank edge after drawing, and returning the blank to the furnace for heat preservation for a second set time, wherein the second set time is 1/3-1/2 of the first set time;
then taking the blank out of the heating equipment, and using the forging equipment to vertically upsett the blank, wherein the single forging ratio is 1.6;
turning the blank by 90 degrees, and shaping and drawing the blank to the corresponding size according to the subsequent processing requirement.
7. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: the temperature of the blank needs to be strictly controlled in the whole forging process, and if the temperature of the blank is lower than the final forging temperature, the blank needs to be sent back to the heating equipment in time for heat preservation.
8. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: the blank needs to be pressed down at a constant speed during upsetting, the upsetting speed is 15mm/s-25mm/s, and tools used in the forging process need to be preheated to 250-400 ℃ in advance.
9. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: in the forging process, if cracks appear on the surface of the blank, the blank needs to be air-cooled and then repaired.
10. The method for manufacturing the titanium alloy ingot by forging the ingot according to claim 1, wherein: before the blank is put into the heating equipment, sharp corners at two ends of the blank are rounded, and high-temperature glass agent needs to be smeared on the surface before the blank is put into the heating equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310279369.XA CN116274798A (en) | 2023-03-21 | 2023-03-21 | Manufacturing method for forging titanium alloy cast ingot |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310279369.XA CN116274798A (en) | 2023-03-21 | 2023-03-21 | Manufacturing method for forging titanium alloy cast ingot |
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