CN112792271A - 7050 alloy forging production process - Google Patents
7050 alloy forging production process Download PDFInfo
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- CN112792271A CN112792271A CN202011533596.3A CN202011533596A CN112792271A CN 112792271 A CN112792271 A CN 112792271A CN 202011533596 A CN202011533596 A CN 202011533596A CN 112792271 A CN112792271 A CN 112792271A
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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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- 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
- B21J5/002—Hybrid process, e.g. forging following casting
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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
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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Abstract
The invention discloses a production process of 7050 alloy forgings, which comprises the following steps: obtaining an ingot; heating the tool, the mold and the ingot; forging the cast ingot, wherein the forging starting temperature of the cast ingot is 410-440 ℃, and the final forging temperature is more than or equal to 350 ℃; forging and squaring the cast ingot to obtain a blank; returning the blank after forging and striking to a furnace for heating, wherein the constant temperature of the heating furnace is 400-460 ℃; when the finish forging temperature of the blank is more than or equal to 390 ℃, discharging the blank out of the furnace after the assembly of the drawing die is finished; when the finish forging temperature of the blank is 350-390 ℃, the heat preservation time of the blank is more than or equal to 60 min; when the finish forging temperature of the blank is less than or equal to 350 ℃, the heat preservation time of the blank is more than or equal to 300 min; and the time for returning the blank to the furnace is less than or equal to 1800 min; carrying out a drawing process and a straightening process on the blank heated by returning to the furnace; the blank is machined to a target size. According to the process provided by the invention, the 7050 alloy forging can be forged and produced by heating, forging, drawing and straightening the cast ingot, and the performance requirements of the forging in subsequent processing are met.
Description
Technical Field
The invention relates to the field of 7050 alloy forging production, in particular to a production process of 7050 alloy forging.
Background
The 7050 alloy forging with the ultra-large specification is an important aerospace part, and the alloy state of the forging is as follows: 7050H112, the forging has large and complex shape and size, and the requirement on the comprehensive performance of the forging is high.
In the prior art, the process production of the 7050 alloy forging with the oversized specification generally only depends on a machining forming mode, the conical ring forging with a specific size and shape is obtained by machining, and due to the complex machining process and high cost, the machining cost of the existing 7050 alloy forging with the oversized specification is extremely high, and the performance of the existing 7050 alloy forging with the oversized specification cannot meet the requirements of technical protocols.
Therefore, how to effectively improve the performance of 7050 alloy forgings is a technical problem to be solved by those skilled in the art at present.
Disclosure of Invention
The invention aims to provide a production process of a 7050 alloy forging, which is used for improving the comprehensive performance of the 7050 alloy forging and meeting the use requirement.
In order to achieve the purpose, the invention provides the following technical scheme:
a production process of a 7050 alloy forging comprises the following steps:
step S1: obtaining an ingot;
step S2: heating the tool, the mold and the ingot;
step S3: forging the cast ingot, wherein the forging temperature of the cast ingot is 410-440 ℃, and the finish forging temperature is more than or equal to 350 ℃;
step S4: forging and squaring the cast ingot to obtain a blank;
step S5: returning the blank after forging and striking to a furnace for heating, wherein the constant temperature of the heating furnace is 400-460 ℃; when the finish forging temperature of the blank is more than or equal to 390 ℃, discharging the blank out of the furnace after the assembly of the drawing die is finished; when the finish forging temperature of the blank is 350-390 ℃, the heat preservation time of the blank is more than or equal to 60 min; when the finish forging temperature of the blank is less than or equal to 350 ℃, the heat preservation time of the blank is more than or equal to 300 min; and the time for returning the blank to the furnace for heating is less than or equal to 1800 min;
step S6: carrying out a drawing process and a straightening process on the blank heated by returning to the furnace;
step S7: and machining the blank machine to a target size.
Preferably, after the step S7, the method further includes the steps of:
carrying out ultrasonic flaw detection on the blank; and cutting the test block.
Preferably, the step S2 includes:
heating the drawing anvil to a fixed temperature of 450 +/-20 ℃ for more than or equal to 8 hours; heating the middle flat anvil and the restraint drawing die to a constant temperature of 450 +/-20 ℃ for more than or equal to 16 hours.
Preferably, the step S2 further includes:
heating the cast ingots by a shared heating furnace, wherein the distance between the cast ingots or the blanks is more than or equal to 200mm, the distance between the cast ingots or the blanks and the furnace doors at two ends is more than or equal to 500mm, and the distance between the cast ingots or the blanks and the effective heating area on the side surface is more than or equal to 100 mm; heating to a constant temperature of 430 +/-20 ℃; the heat preservation time of the cast ingot is more than or equal to 840 minutes and less than 2520 minutes; the shortest heat preservation time of the second heating of the blank is calculated according to the actual thickness of mm multiplied by 1 minute/mm, and the longest heat preservation time is calculated according to the actual thickness of mm multiplied by 3 minutes/mm.
Preferably, the step S6 includes:
after a 2200 drawing anvil and a constraint drawing die are assembled on a 1 ten thousand ton oil press, drawing the blank; the forging temperature of the blank is 390-440 ℃, and the finish forging temperature is more than or equal to 350 ℃ after the drawing is finished; the using temperature of the die is 250-420 ℃.
Preferably, the step S6 further includes:
and (3) straightening the blank after assembling a set of middle flat anvils on a 3 ten thousand ton press, wherein the straightening temperature is more than or equal to 300 ℃.
Preferably, the length of the cast ingot after face milling is 2000 +/-20 mm, the width is 1390 +/-20 mm, and the height is 420 +/-20 mm; the step S4 includes:
marking an A surface, a B surface and a C surface on the ingot, wherein the A surface is vertical to the height direction, the B surface is vertical to the width direction, and the C surface is vertical to the length direction;
the height from the upsetting C surface to the C surface is 900-920mm, and the pressing speed is less than or equal to 5 mm/s; the height from the upsetting surface A to the surface A is 600-620 mm; the height from the upsetting surface B to the surface B is 900-920mm, and the pressing speed is less than or equal to 5 mm/s; the height from the upsetting C surface to the C surface is 1000-1020 mm; the height from the upsetting surface A to the surface A is 550-570 mm; the height from the upset surface B to the surface B is 1200-1220 mm; the height from the upsetting C surface to the C surface is 1550 +/-30 mm; the height from the upset surface B to the surface B is 1200-1210 mm.
Preferably, the step S6 includes:
adopting double-sided symmetrical drawing, and aligning and drawing a drawing anvil and a restraining and drawing die; the length direction of the blank is drawn out to 150-.
Preferably, the step S6 further includes:
and straightening the blank, wherein the rolling reduction is less than or equal to 5mm, and the warping is less than or equal to 5 mm.
Preferably, the step S7 includes:
measuring and recording the size of the blank before machining, and uniformly removing machining allowance in the width direction and the height direction by adopting symmetrical machining; machining the blank to 140-145mm in height, 1300-1305mm in width and 5 or more in upper and lower plane cleanliness.
The production process of the 7050 alloy forging provided by the invention comprises the following steps: step S1: obtaining an ingot; step S2: heating the tool, the mold and the ingot; step S3: forging the cast ingot, wherein the forging temperature of the cast ingot is 410-440 ℃, and the finish forging temperature is more than or equal to 350 ℃; step S4: forging and squaring the cast ingot to obtain a blank; step S5: returning the blank after forging and striking to a furnace for heating, wherein the constant temperature of the heating furnace is 400-460 ℃; when the finish forging temperature of the blank is more than or equal to 390 ℃, discharging the blank out of the furnace after the assembly of the drawing die is finished; when the finish forging temperature of the blank is 350-390 ℃, the heat preservation time of the blank is more than or equal to 60 min; when the finish forging temperature of the blank is less than or equal to 350 ℃, the heat preservation time of the blank is more than or equal to 300 min; and the time for returning the blank to the furnace for heating is less than or equal to 1800 min; step S6: carrying out a drawing process and a straightening process on the blank heated by returning to the furnace; step S7: and machining the blank machine to a target size. According to the production process of the 7050 alloy forging, the cast ingot is subjected to heating, forging, drawing and straightening processes, so that the 7050 alloy forging can be forged and produced, and the performance requirements of the forging in subsequent processing are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of one embodiment of a production process of a 7050 alloy forging provided by the invention;
FIG. 2-1 is a front view of a heating furnace used in the 7050 alloy forging production process provided by the present invention;
FIG. 2-2 is a side view of a heating furnace used in the 7050 alloy forging production process provided by the present invention;
FIG. 3 is a schematic view of furnace charging of a heating furnace used in the production process of 7050 alloy forgings provided by the invention;
FIG. 4 is a process diagram of forging and squaring in the production process of 7050 alloy forgings provided by the invention;
FIG. 5 is a drawing process diagram of a 7050 alloy forging production process according to the present invention;
FIG. 6 is a saw cutting view of a forging in the production process of 7050 alloy forgings provided by the invention;
wherein: and 1, ingot casting.
Detailed Description
The core of the invention is to provide a production process of 7050 alloy forgings, which is used for improving the comprehensive performance of 7050 alloy forgings and meeting the use requirements.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 6, fig. 1 is a flowchart of an embodiment of a production process of a 7050 alloy forging according to the present invention; FIG. 2-1 is a front view of a heating furnace used in the 7050 alloy forging production process provided by the present invention; FIG. 2-2 is a side view of a heating furnace used in the 7050 alloy forging production process provided by the present invention; FIG. 3 is a schematic view of furnace charging of a heating furnace used in the production process of 7050 alloy forgings provided by the invention; FIG. 4 is a process diagram of forging and squaring in the production process of 7050 alloy forgings provided by the invention; FIG. 5 is a drawing process diagram of a 7050 alloy forging production process according to the present invention; FIG. 6 is a saw cutting drawing of a forging in the production process of 7050 alloy forgings provided by the invention.
In the embodiment, the production process of the 7050 alloy forging comprises the following steps:
step S1: obtaining an ingot;
step S2: heating the tool, the mold and the ingot;
step S3: forging the cast ingot, wherein the forging starting temperature of the cast ingot is 410-440 ℃, and the final forging temperature is more than or equal to 350 ℃; the using temperature of the die is 250-420 ℃;
step S4: forging and squaring the cast ingot to obtain a blank;
step S5: returning the blank after forging and striking to a furnace for heating, wherein the constant temperature of the heating furnace is 400-460 ℃; when the finish forging temperature of the blank is more than or equal to 390 ℃, discharging the blank out of the furnace after the assembly of the drawing die is finished; when the finish forging temperature of the blank is 350-390 ℃, the heat preservation time of the blank is more than or equal to 60 min; when the finish forging temperature of the blank is less than or equal to 350 ℃, the heat preservation time of the blank is more than or equal to 300 min; and the time for returning the blank to the furnace is less than or equal to 1800 min;
step S6: carrying out a drawing process and a straightening process on the blank heated by returning to the furnace;
step S7: the blank is machined to a target size.
According to the production process of the 7050 alloy forging, the cast ingot is subjected to heating, forging, drawing and straightening processes, so that the 7050 alloy forging can be forged and produced, and the performance requirements of the forging in subsequent processing are met.
In addition to the above embodiments, the method further includes, after step S7:
carrying out ultrasonic flaw detection on the blank; and cutting the test block.
In addition to the above embodiments, step S2 includes:
heating the drawing anvil to a constant temperature of 450 +/-20 ℃, preferably 450 ℃, and the heating time is more than or equal to 8 hours; the flat anvil and the restraint drawing die are heated to 450 +/-20 ℃, preferably 450 ℃ for more than or equal to 16 hours.
In addition to the above embodiments, step S2 further includes:
as shown in fig. 2-1 and fig. 2-2, a shared heating furnace is adopted to heat the cast ingots, the space between the cast ingots or the blanks is more than or equal to 200mm, the distance between the cast ingots or the blanks and the furnace doors at two ends is more than or equal to 500mm, and the distance between the cast ingots or the blanks and the effective heating zone at the side surface is more than or equal to 100 mm; heating to a constant temperature of 430 +/-20 ℃; the heat preservation time of the cast ingot is more than or equal to 840 minutes and less than 2520 minutes; the shortest heat preservation time of the second heating of the blank is calculated according to the actual thickness of mm multiplied by 1 minute/mm, and the longest heat preservation time is calculated according to the actual thickness of mm multiplied by 3 minutes/mm.
In addition to the above embodiments, step S6 includes:
after a 2200 drawing anvil and a constraint drawing die are assembled on a 1 ten thousand ton oil press, drawing a blank; the forging temperature of the blank is 390-440 ℃, and the finish forging temperature is more than or equal to 350 ℃ after the drawing is finished; the using temperature of the die is 250-420 ℃.
In addition to the above embodiments, step S6 further includes:
after a set of middle flat anvils are assembled on a 3 ten thousand ton press, the blank is straightened, and the straightening temperature is more than or equal to 300 ℃. Then, imprinting is performed: alloy, batch, melting times and part number, marking T on the original end surface of the cast ingot with a mark T at the gate end, and recording transfer time.
In addition to the above embodiments, the cast ingot after face milling has a length of 2000 ± 20mm, a width of 1390 ± 20mm, and a height of 420 ± 20 mm; step S4 includes:
marking an A surface, a B surface and a C surface on the ingot, wherein the A surface is vertical to the height direction, the B surface is vertical to the width direction, and the C surface is vertical to the length direction;
the height from the upsetting C surface to the C surface is 900-920mm, and the pressing speed is less than or equal to 5 mm/s; the height from the upsetting surface A to the surface A is 600-620 mm; the height from the upsetting surface B to the surface B is 900-920mm, and the pressing speed is less than or equal to 5 mm/s; the height from the upsetting C surface to the C surface is 1000-1020 mm; the height from the upsetting surface A to the surface A is 550-570 mm; the height from the upset surface B to the surface B is 1200-1220 mm; the height from the upsetting C surface to the C surface is 1550 +/-30 mm; the height from the upset surface B to the surface B is 1200-1210 mm.
Further, before forging, according to fig. 4, a plane of an ingot (2000mm long × 1390mm wide) is marked with "a", a side surface is marked with "B", and an end facet is marked with "C"; the cast ingot with the mark T at the sprue gate end is marked with asphalt at the end face of the mark T before and after forging; forging and squaring: the anvil is flattened during the assembly of the 1 ten thousand tons of oil presses, and the forging and squaring process steps are required to be forged according to the table 1 and the figure 4; returning the blank to the furnace within 10 minutes after the forging is finished; imprinting: alloy, batch, melting times and part number, and stamping T on the original end surface of the cast ingot with a mark T at the gate end.
TABLE 1 forging Process
Specifically, the specification of the ingot is 450mm multiplied by 1420mm multiplied by 2000mm, the size after face milling is 420mm multiplied by 1390mm multiplied by 2000mm, the ingot is produced and detected according to the technical protocol requirement of Q/SWA J5074-2016 ingot, the quality of the ingot accords with a first-level oxidation film, the ingot is first-level loose, and the hydrogen content is less than or equal to 0.10 mu g/g; marking the ingot: alloy, heat of fusion, part number, gate end mark (T), check mark and record in card.
In addition to the above embodiments, as shown in fig. 5, step S6 includes:
adopting double-sided symmetrical drawing, and aligning and drawing a drawing anvil and a restraining and drawing die; the length direction of the blank is drawn to 150-.
In addition to the above embodiments, step S6 further includes:
straightening the blank, wherein the rolling reduction is less than or equal to 5mm, and the warping is less than or equal to 5 mm.
In addition to the above embodiments, step S7 includes:
measuring and recording the size of the blank before machining, and uniformly removing machining allowance in the width direction and the height direction by adopting symmetrical machining; machining the blank to 140-145mm in height, 1300-1305mm in width and 5 or more in upper and lower plane cleanliness. Checking and recording all marks of the forge piece in the card before machining; the mark comprises alloy, batch, melting times, part number, and T is marked on the original end face of the cast ingot with the mark T at the gate end.
Further, after step S7, the method further includes the steps of: carrying out ultrasonic flaw detection on the blank; and cutting the test block. Wherein, ultrasonic flaw detection: a1 # water immersion type ultrasonic flaw detection instrument of a rolling mill performs A-level and AA-level flaw detection on the upper and lower planes of a forging piece by a water immersion method according to GB/T6519 and a forging piece drawing. All flaw detection defects (including defects below class a) were recorded and identified, and defect and normal waveform patterns were provided for subsequent comparative studies. Sawing a test block: sawing is performed according to fig. 6, in mm, the print is printed on the lower right corner of the test block, and all the directions of the characters are printed according to fig. 6. Printing and photographing and then sawing.
By adopting the production process of the 7050 alloy forging provided by the invention, the obtained forging stock alloy is 7050H112, the size is 140mm multiplied by 1300mm multiplied by 4500mm, the technical condition is Q/SWA J5074-2016, and I-type parts.
The production process of the 7050 alloy forging provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A production process of a 7050 alloy forging is characterized by comprising the following steps:
step S1: obtaining an ingot;
step S2: heating the tool, the mold and the ingot;
step S3: forging the cast ingot, wherein the forging temperature of the cast ingot is 410-440 ℃, and the finish forging temperature is more than or equal to 350 ℃;
step S4: forging and squaring the cast ingot to obtain a blank;
step S5: returning the blank after forging and striking to a furnace for heating, wherein the constant temperature of the heating furnace is 400-460 ℃; when the finish forging temperature of the blank is more than or equal to 390 ℃, discharging the blank out of the furnace after the assembly of the drawing die is finished; when the finish forging temperature of the blank is 350-390 ℃, the heat preservation time of the blank is more than or equal to 60 min; when the finish forging temperature of the blank is less than or equal to 350 ℃, the heat preservation time of the blank is more than or equal to 300 min; and the time for returning the blank to the furnace for heating is less than or equal to 1800 min;
step S6: carrying out a drawing process and a straightening process on the blank heated by returning to the furnace;
step S7: and machining the blank machine to a target size.
2. The production process of 7050 alloy forging according to claim 1, further comprising, after the step S7:
carrying out ultrasonic flaw detection on the blank; and cutting the test block.
3. The production process of 7050 alloy forging according to claim 1, wherein the step S2 includes:
heating the drawing anvil to a fixed temperature of 450 +/-20 ℃ for more than or equal to 8 hours; heating the middle flat anvil and the restraint drawing die to a constant temperature of 450 +/-20 ℃ for more than or equal to 16 hours.
4. The production process of 7050 alloy forging according to claim 3, wherein the step S2 further comprises:
heating the cast ingots by a shared heating furnace, wherein the distance between the cast ingots or the blanks is more than or equal to 200mm, the distance between the cast ingots or the blanks and the furnace doors at two ends is more than or equal to 500mm, and the distance between the cast ingots or the blanks and the effective heating area on the side surface is more than or equal to 100 mm; heating to a constant temperature of 430 +/-20 ℃; the heat preservation time of the cast ingot is more than or equal to 840 minutes and less than 2520 minutes; the shortest heat preservation time of the second heating of the blank is calculated according to the actual thickness of mm multiplied by 1 minute/mm, and the longest heat preservation time is calculated according to the actual thickness of mm multiplied by 3 minutes/mm.
5. The production process of 7050 alloy forging according to claim 1, wherein the step S6 includes:
after a 2200 drawing anvil and a constraint drawing die are assembled on a 1 ten thousand ton oil press, drawing the blank; the forging temperature of the blank is 390-440 ℃, and the finish forging temperature is more than or equal to 350 ℃ after the drawing is finished; the using temperature of the die is 250-420 ℃.
6. The production process of 7050 alloy forging according to claim 5, wherein the step S6 further comprises:
and (3) straightening the blank after assembling a set of middle flat anvils on a 3 ten thousand ton press, wherein the straightening temperature is more than or equal to 300 ℃.
7. The production process of a 7050 alloy forging according to any one of claims 1 to 6, wherein the ingot after face milling has a length of 2000 ± 20mm, a width of 1390 ± 20mm and a height of 420 ± 20 mm; the step S4 includes:
marking an A surface, a B surface and a C surface on the ingot, wherein the A surface is vertical to the height direction, the B surface is vertical to the width direction, and the C surface is vertical to the length direction;
the height from the upsetting C surface to the C surface is 900-920mm, and the pressing speed is less than or equal to 5 mm/s; the height from the upsetting surface A to the surface A is 600-620 mm; the height from the upsetting surface B to the surface B is 900-920mm, and the pressing speed is less than or equal to 5 mm/s; the height from the upsetting C surface to the C surface is 1000-1020 mm; the height from the upsetting surface A to the surface A is 550-570 mm; the height from the upset surface B to the surface B is 1200-1220 mm; the height from the upsetting C surface to the C surface is 1550 +/-30 mm; the height from the upset surface B to the surface B is 1200-1210 mm.
8. The production process of 7050 alloy forging according to claim 7, wherein the step S6 includes:
adopting double-sided symmetrical drawing, and aligning and drawing a drawing anvil and a restraining and drawing die; the length direction of the blank is drawn out to 150-.
9. The production process of 7050 alloy forging according to claim 8, wherein the step S6 further comprises:
and straightening the blank, wherein the rolling reduction is less than or equal to 5mm, and the warping is less than or equal to 5 mm.
10. The production process of 7050 alloy forging according to claim 9, wherein the step S7 includes:
measuring and recording the size of the blank before machining, and uniformly removing machining allowance in the width direction and the height direction by adopting symmetrical machining; machining the blank to 140-145mm in height, 1300-1305mm in width and 5 or more in upper and lower plane cleanliness.
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