CN112247483A - 2195 aluminum-lithium alloy special-shaped cross section structure and spinning method thereof - Google Patents
2195 aluminum-lithium alloy special-shaped cross section structure and spinning method thereof Download PDFInfo
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- CN112247483A CN112247483A CN202011042319.2A CN202011042319A CN112247483A CN 112247483 A CN112247483 A CN 112247483A CN 202011042319 A CN202011042319 A CN 202011042319A CN 112247483 A CN112247483 A CN 112247483A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention provides a 2195 aluminum lithium alloy special-shaped cross section structure and a spinning method thereof, wherein the special-shaped cross section structure is characterized in that a curved surface flanging structure is arranged in the central area of a spatial smooth molded surface, the flanging molded surface is of a curve fitting structure, the top diameter is 240mm, and the molded surface precision requirement is high. The method realizes the integrated forming of the special-shaped structure hot spinning of the 2195 aluminum lithium material by controlling the deformation of each pass to be 10.5-15.5 percent through circulating hot strong spinning forming, quenching, shape correction, machining and artificial aging, and the deformation is gradually reduced in a gradient manner, and the rotating speed of a main shaft is 25 rpm/min. The method breaks through the two-time forming scheme that the smooth molded surface is firstly drawn by the rigid die and then the special-shaped structure is formed by local flanging in the traditional forming process of the special-shaped structure, remarkably reduces the scrapping risk caused by cracks in the rigid die drawing and flanging process, creates a hot spinning integrated forming idea, realizes the forming of a new material special-shaped structure, and lays a foundation for the application of a new material engineering.
Description
Technical Field
The invention belongs to the field of aerospace parts, and particularly relates to a 2195 aluminum lithium alloy special-shaped cross section structure and a spinning method thereof.
Background
With the progress of aerospace industry, novel rockets are developed towards light weight and high performance, and new requirements are provided for material performance and key structure reliability in order to effectively reduce the structural mass and obviously increase the effective load. 2195 Al-Li alloy as one new kind of alloy has low density, high strength, high specific modulus, excellent anticorrosive performance, low temperature performance and other features, and is one of ideal structural materials with wide application foreground in aerospace field. Many key components of the rocket fuel storage tank are large-size thin-wall complex structures, and are 2195 aluminum lithium alloy special-shaped cross section structures, the product has two sections of cross section characteristics of AB and BC, the inner surface of the AB section is a space smooth profile, the BC section is a space complex curvature cross section, the rocket fuel storage tank belongs to a special-shaped structure, the requirements on the mechanical property and the profile precision of the product are high, and the forming quality of the components directly determines the reliability of the rocket body structure. The 2195 aluminum-lithium alloy is adopted for the novel rocket-developed special-shaped section component, and the 2195 aluminum-lithium alloy belongs to a novel material, so that the forming performance of the 2195 aluminum-lithium alloy is not supported by complete data, and the shaping of the 2195 aluminum-lithium alloy is relatively low and the problem of the accompanied anisotropy is a key difficulty in manufacturing the novel storage tank which needs to be broken through urgently. The traditional forming of the component generally adopts two sets of drawing dies, firstly a smooth molded surface is formed by drawing by a hydraulic machine, and then the special-shaped structural characteristics are formed by drawing independently, so that the manufacturing period and the die cost are large, and the requirements of new model development are not met. Comprehensive analysis shows that the special-shaped section structure belongs to a revolving body structure and has the feasibility of adopting spinning forming. However, aiming at the special-shaped structural characteristics, the joint of the flange and the conical wall is easy to generate stacking, the extension resistance of the material at the local convex hole characteristic is large, and the spinning resistance is easy to cause the fracture problem. Meanwhile, the spinning experience and the reference technical data of the novel material special-shaped structure are less. Therefore, the spinning forming technology of the 2195 aluminum lithium alloy special-shaped structure is broken through, the spinning and heat treatment experiences of the special-shaped structure are accumulated, and the method is of great importance for realizing the engineering application of a new material on a key component of the storage tank and promoting the development of new models.
Disclosure of Invention
In view of the above, the invention aims to provide a 2195 aluminum lithium alloy special-shaped section structure and a spinning method thereof, which adopt an integral spinning forming method to replace the original forming method requiring two working procedures, and save the production period and the manufacturing cost.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a2195 Al-Li alloy special-shaped section structure and a spinning method thereof comprise the following steps:
s1, preparing a blank; after the blank preparation is finished, arranging a pin positioning hole in the center of the blank;
s2, debugging a spinning device; clamping the spinning die by using a numerical control spinning machine, correcting the runout of the spinning die by using a dial indicator, clamping a blank after the correction is finished, and spinning the blank by using a main shaft of the numerical control spinning machine;
s3, carrying out hot spinning forming on the blank, wherein the minimum thickness of the workpiece after hot spinning forming is not less than 11 mm; one end of a large circle of the formed workpiece is defined as a large end, and one end of a small circle of the formed workpiece is defined as a small end;
a) heating the mould by using a spray gun, then locally heating the deformation area of the blank by using the flame of the spray gun,
b) molding the special-shaped section structure, and selecting 30-pass circulating heat forced rotation and circulating heat common rotation for molding; spinning path: the forward spinning is adopted for 1-10 times, and the forward spinning and the reverse spinning are adopted for 11-30 times in a staggered manner;
c) continuously selecting a 15-pass circulating thermal forced spinning process for the workpiece formed in the step b), forming a smooth profile structure, and adopting a normal spinning process in the whole process;
s4, quenching; after spinning, the strength is improved by adopting a quenching process, a quenching tool is manufactured in a matching way, and the quenching deformation can be effectively controlled by adopting a circumferential allowance bundling method; an aluminum alloy quenching furnace is adopted for quenching, the opening of the workpiece is placed downwards on a quenching clamp base, and the workpiece is tightly pressed and then quenched;
s5: aiming at the deformation condition of the workpiece after quenching in the S4, a numerical control spinning machine is adopted for spinning and shape correction, a multi-pass hot common spinning process is adopted, the wall thickness is not reduced in the shape correction process, and the heating temperature is controlled within 300 ℃;
s6: machining the inner surface, selecting a numerical control lathe sleeper as machining equipment, fixing the large end of the workpiece subjected to the sizing in S5 on a flange plate, and clamping the large end of the workpiece to machine the inner surface of the workpiece; detecting the wall thickness by using a thickness gauge, and performing coloring inspection on the processed surface, wherein no crack is required;
s7: machining the outer profile, continuously machining the outer profile of the machined workpiece of the inner profile by using a numerical control lathe carriage, clamping a turning mould, and sleeving the workpiece on the lathe mould for machining; detecting the wall thickness by using a thickness gauge, and after the processing is finished, carrying out coloring inspection on the processed surface, wherein the coloring area is required to be more than 95%;
s8: and (4) artificial aging, namely performing aging treatment by using an aluminum alloy air circulating furnace.
Furthermore, the blank in the S1 is in a circular structure with the diameter of phi 1380mm, the thickness of the blank is 16mm, and the diameter of the pin positioning hole is 6-phi 25 mm.
Further, S2 shows that the runout of the spinning die is not more than 0.1mm, and the number of revolutions of the main shaft of the numerical control spinning machine during spinning processing is 30 rmp.
Further, in step S3, the specific parameters of the process test are as follows,
(1) the heating temperature of the spray gun to the spinning die is 50-100 ℃, and the heating temperature of the spray gun to the local deformation area of the blank is 360-400 ℃;
(2) the deformation of each pass in the step b) is 10.5 to 15.5 percent and is gradually reduced in a gradient manner; the axial feeding speed is 200mm/min, and the rotating speed of the main shaft is 25 rpm/min; the pressing amount of each pass is 0.8-1.3mm/rpm, the attack angle of the spinning wheel is 15 degrees, and R20-R30 is selected as the radius of the fillet of the spinning wheel to prevent the local bulge of the material at the front edge of the spinning wheel from being too high;
(3) the deformation of each pass in the step c) is 15.5-20.5%, the deformation is gradually reduced in a gradient manner, the axial feeding speed is 300mm/min, and the rotating speed of the main shaft is 30 rpm/min. The pressing amount of each pass is 1.5-2 mm/rpm. In order to prevent the rotary wheel from being over-high in local material bulge at the front edge, the radius of the circular bead of the rotary wheel is selected from R20-R30;
(4) the diameter of the large end of the workpiece is 1380mm, the diameter of the small end is 239.5mm, and the height of the workpiece is 164 mm.
Further, in the step S4, the quenching transfer time is not more than 15S, the quenching medium is water, the solid solution temperature is 520 ℃, and the solid solution heat preservation time is 60 min.
Further, in the step S6, the large end of the workpiece is fixed on the flange plate, the parallel end face is not more than 0.2mm, the small end of the workpiece is clamped, the small end jump is not more than 0.2mm, after the inner shape surface is machined, the diameter of the large end is 1380.5mm +/-0.5 mm, the size of the small end is 239.5mm +/-0.5 mm, and the total height is 164 mm;
and the subsequent machining allowance of the outer surface is ensured to be more than 5mm, the wall thickness is detected, and the detection point with the thinnest wall thickness is not less than 10.5 mm.
Furthermore, in step S7, the runout of the big end and the small end is not more than 0.03mm, and the diameter of the big end of the workpiece is equal to the diameter of the big end after the external shape is machined
Diameter of small end
The total height of the workpiece is 164mm, and the final wall thickness is ensured to be 5.5mm +/-0.15; the thickness meter detects the wall thickness, and the detection point with the thinnest wall thickness is not less than 5.5 mm.
Further, in the step S8, an aluminum alloy air circulation furnace is adopted for artificial aging, a flat furnace loading mode is adopted, the aging temperature is 190 ℃, and the aging heat preservation time is 18 h.
Compared with the prior art, the 2195 aluminum lithium alloy special-shaped section structure and the spinning method thereof have the following advantages:
(1) the invention creates the 2195 aluminum lithium alloy special-shaped cross section structure and the spinning method thereof, breaks through the difficulty in developing a novel rocket key component, and adopts a hot spinning forming device, an optimized spinning process and a heat treatment process to realize the integral spinning forming of the 2195 aluminum lithium alloy special-shaped cross section structure.
(2) Compared with the traditional method of drawing and deep forming by rigid dies with two working procedures, the method greatly saves the manufacturing cost of the die, shortens the processing period of the product and obviously reduces the scrap risk caused by the cracks in the flanging working procedure of the product. The method accumulates valuable experience for forming the special-shaped structure of the new material and lays a foundation for accelerating the implementation of engineering application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a schematic diagram of forming a spinning workpiece according to an embodiment of the present invention.
Description of reference numerals:
1. a workpiece; 2. an AB section; 3. and a BC section.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A2195 Al-Li alloy special-shaped section structure and a spinning method thereof are shown in figure 1, and comprise the following steps:
s1, preparing a blank; considering the process allowance, the diameter extends by 50mm along the circumferential direction, the diameter is used as the clamping process allowance for controlling the subsequent heat treatment deformation, the subsequent allowance is also used for cutting the body test piece, the blank is synchronously prepared with a pin positioning hole, and the pin positioning hole is used for aligning and positioning with a pin hole on the end face of the core mold and is also used as a water through hole during the subsequent quenching.
S2, debugging a spinning device; clamping the spinning die by using a numerical control spinning machine, correcting the runout of the spinning die by using a dial indicator, clamping a blank after the correction is finished, and spinning the blank by using a main shaft of the numerical control spinning machine;
s3, carrying out hot spinning forming on the blank, wherein the minimum thickness of the workpiece 1 after hot spinning forming is not less than 11 mm; one end of a big circle of the formed workpiece 1 is defined as a big end, and one end of a small circle of the formed workpiece 1 is defined as a small end;
a) heating the die by using a spray gun, then locally heating the deformation area of the blank by using the flame of the spray gun, and ensuring continuous heating in the spinning process;
b) as shown in fig. 1, during the molding of the BC special-shaped section structure, stacking is easy to occur at the joint of the flange and the conical wall, and 30-pass cycle thermal forced spinning and cycle thermal normal spinning molding is selected for reducing the extension resistance of the material at the local characteristic position and solving the problem of breakage caused by excessive spinning resistance at the position; spinning path: the forward spinning is adopted for 1-10 times, and the forward spinning and the reverse spinning are adopted for 11-30 times in a staggered manner; spinning the central area of the blank to form a preset special-shaped curved surface structure, and performing diameter reduction by multiple-pass general spinning and then multiple-pass strong-spinning die pasting;
c) aiming at the workpiece 1 formed in the step b), continuously selecting a 15-pass circulating thermal forced spinning process to form an AB section 2 smooth profile structure, and adopting a forward spinning process in the whole process as shown in figure 1;
s4, quenching; after spinning, the strength is improved by adopting a quenching process, a quenching tool is manufactured in a matching way, and the quenching deformation can be effectively controlled by adopting a circumferential allowance bundling method; an aluminum alloy quenching furnace is adopted for quenching, the opening part of the workpiece 1 is downwards placed on a quenching clamp base, and the workpiece is tightly pressed and then quenched;
s5: aiming at the deformation condition of the workpiece 1 after quenching in the S4, a numerical control spinning machine is adopted for spinning and shape correction, a multi-pass hot common spinning process is adopted, the wall thickness is not reduced in the shape correction process, and the heating temperature is controlled within 300 ℃;
s6: machining the inner shape surface, selecting a numerical control lathe horizontal lathe as machining equipment, fixing the large end of the workpiece 1 subjected to shape correction in S5 on a flange plate, and clamping the large end of the workpiece 1 to machine the inner shape surface of the workpiece 1; detecting the wall thickness by using a thickness gauge, and performing coloring inspection on the processed surface, wherein no crack is required;
s7: machining an outer shape surface, continuously machining the outer shape surface of the workpiece 1 machined by the inner shape surface by using a numerical control lathe horizontal lathe, clamping a turning mould, and sleeving the workpiece 1 on the lathe mould for machining; detecting the wall thickness by using a thickness gauge, and after the processing is finished, carrying out coloring inspection on the processed surface, wherein the coloring area is required to be more than 95%;
s8: and (4) artificial aging, namely performing aging treatment by using an aluminum alloy air circulating furnace.
S1, the blank is in a circular structure with the diameter of 1380mm, the thickness of the blank is 16mm, and the diameter of the pin positioning hole is 6-phi 25 mm.
S2 the jumping of the spinning mould is not more than 0.1mm, the revolution of the main shaft of the numerical control spinning machine is 30rmp during spinning processing.
In step S3, the specific parameters of the process test are as follows,
(1) the heating temperature of the spray gun to the spinning die is 50-100 ℃, and the heating temperature of the spray gun to the local deformation area of the blank is 360-400 ℃;
(2) the deformation of each pass in the step b) is 10.5 to 15.5 percent and is gradually reduced in a gradient manner; the axial feeding speed is 200mm/min, and the rotating speed of the main shaft is 25 rpm/min; the pressing amount of each pass is 0.8-1.3mm/rpm, the attack angle of the spinning wheel is 15 degrees, and R20-R30 is selected as the radius of the fillet of the spinning wheel to prevent the local bulge of the material at the front edge of the spinning wheel from being too high;
(3) the deformation of each pass in the step c) is 15.5-20.5%, the deformation is gradually reduced in a gradient manner, the axial feeding speed is 300mm/min, and the rotating speed of the main shaft is 30 rpm/min. The pressing amount of each pass is 1.5-2 mm/rpm. In order to prevent the rotary wheel from being over-high in local material bulge at the front edge, the radius of the circular bead of the rotary wheel is selected from R20-R30;
(4) the diameter of the large end of the workpiece 1 is 1380mm, the diameter of the small end is 239.5mm, and the height of the workpiece 1 is 164 mm.
In step S4, since the 2195 aluminum-lithium alloy is a new material, a heat treatment system is formulated according to previous groceries, and in order to ensure usability and save energy consumption, the heat treatment process is formulated as follows: the quenching transfer time is not more than 15s, the quenching medium is water, the solid solution temperature is 520 ℃, and the solid solution heat preservation time is 60 min;
step S6, fixing the big end of the workpiece 1 on a flange plate, ensuring that the parallel end face is not more than 0.2mm, clamping the small end of the workpiece 1, ensuring that the small end jumps not more than 0.2mm, after machining the inner shape face, the diameter of the big end is 1380.5mm +/-0.5 mm, the size of the small end is 239.5mm +/-0.5 mm, and the total height is 164 mm;
and the subsequent machining allowance of the outer surface is ensured to be more than 5mm, the wall thickness is detected, and the detection point with the thinnest wall thickness is not less than 10.5 mm.
In step S7, the runout of the big end and the small end is not more than 0.03mm, and the diameter of the big end of the workpiece 1 is equal to that of the machined external surface
Diameter of small end
The total height of the workpiece 1 is 164mm, and the final wall thickness is ensured to be 5.5mm +/-0.15; the thickness meter detects the wall thickness, and the detection point with the thinnest wall thickness is not less than 5.5 mm.
In the step S8, an aluminum alloy air circulation furnace is adopted for artificial aging, a flat furnace loading mode is adopted, the aging temperature is 190 ℃, and the aging heat preservation time is 18 h.
A2195 Al-Li alloy special-shaped cross section structure and a spinning method thereof have the following progressive effects: the spinning scheme breaks through the difficult problem of development of a novel rocket key component, adopts a hot spinning forming scheme, an optimized spinning process and a heat treatment process aiming at a special-shaped structure of the 2195 aluminum lithium alloy, realizes the integral spinning forming of the special-shaped section structure of the 2195 aluminum lithium alloy, and compared with the traditional method that the component needs two processes of rigid die deep drawing forming, the method greatly saves the manufacturing cost of a die, shortens the processing period of a product, and obviously reduces the scrapping risk caused by the cracks in the flanging process of the product; the method accumulates valuable experience for forming the special-shaped structure of the new material and lays a foundation for accelerating the implementation of engineering application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (8)
1. A2195 Al-Li alloy special-shaped section structure and a spinning method thereof are characterized by comprising the following steps:
s1, preparing a blank; after the blank preparation is finished, arranging a pin positioning hole in the center of the blank;
s2, debugging a spinning device; clamping the spinning die by using a numerical control spinning machine, correcting the runout of the spinning die by using a dial indicator, clamping a blank after the correction is finished, and spinning the blank by using a main shaft of the numerical control spinning machine;
s3, carrying out hot spinning forming on the blank, wherein the minimum thickness of the workpiece after hot spinning forming is not less than 11 mm; one end of a large circle of the formed workpiece is defined as a large end, and one end of a small circle of the formed workpiece is defined as a small end;
a) heating the mould by using a spray gun, then locally heating the deformation area of the blank by using the flame of the spray gun,
b) molding the special-shaped section structure, and selecting 30-pass circulating heat forced rotation and circulating heat common rotation for molding; spinning path: the forward spinning is adopted for 1-10 times, and the forward spinning and the reverse spinning are adopted for 11-30 times in a staggered manner;
c) continuously selecting a 15-pass circulating thermal forced spinning process for the workpiece formed in the step b), forming a smooth profile structure, and adopting a normal spinning process in the whole process;
s4, quenching; after spinning, the strength is improved by adopting a quenching process, a quenching tool is manufactured in a matching way, and the quenching deformation can be effectively controlled by adopting a circumferential allowance bundling method; an aluminum alloy quenching furnace is adopted for quenching, the opening of the workpiece is placed downwards on a quenching clamp base, and the workpiece is tightly pressed and then quenched;
s5: aiming at the deformation condition of the workpiece after quenching in the S4, a numerical control spinning machine is adopted for spinning and shape correction, a multi-pass hot common spinning process is adopted, the wall thickness is not reduced in the shape correction process, and the heating temperature is controlled within 300 ℃;
s6: machining the inner surface, selecting a numerical control lathe sleeper as machining equipment, fixing the large end of the workpiece subjected to the sizing in S5 on a flange plate, and clamping the large end of the workpiece to machine the inner surface of the workpiece; detecting the wall thickness by using a thickness gauge, and performing coloring inspection on the processed surface, wherein no crack is required;
s7: machining the outer profile, continuously machining the outer profile of the machined workpiece of the inner profile by using a numerical control lathe carriage, clamping a turning mould, and sleeving the workpiece on the lathe mould for machining; detecting the wall thickness by using a thickness gauge, and after the processing is finished, carrying out coloring inspection on the processed surface, wherein the coloring area is required to be more than 95%;
s8: and (4) artificial aging, namely performing aging treatment by using an aluminum alloy air circulating furnace.
2. A 2195 Al-Li alloy special-shaped cross-section structure and a spinning method thereof as claimed in claim 1, wherein: the blank in the S1 is in a circular structure with the diameter of phi 1380mm, the thickness of the blank is 16mm, and the diameter of the pin positioning hole is 6-phi 25 mm.
3. A 2195 Al-Li alloy special-shaped cross-section structure and a spinning method thereof as claimed in claim 1, wherein: s2 the jumping of the spinning mould is not more than 0.1mm, the revolution of the main shaft of the numerical control spinning machine is 30rmp during spinning processing.
4. A 2195 Al-Li alloy special-shaped cross-section structure and a spinning method thereof as claimed in claim 1, wherein: in step S3, the specific parameters of the process test are as follows,
(1) the heating temperature of the spray gun to the spinning die is 50-100 ℃, and the heating temperature of the spray gun to the local deformation area of the blank is 360-400 ℃;
(2) the deformation of each pass in the step b) is 10.5 to 15.5 percent and is gradually reduced in a gradient manner; the axial feeding speed is 200mm/min, and the rotating speed of the main shaft is 25 rpm/min; the pressing amount of each pass is 0.8-1.3mm/rpm, the attack angle of the spinning wheel is 15 degrees, and R20-R30 is selected as the radius of the fillet of the spinning wheel to prevent the local bulge of the material at the front edge of the spinning wheel from being too high;
(3) the deformation of each pass in the step c) is 15.5-20.5%, the deformation is gradually reduced in a gradient manner, the axial feeding speed is 300mm/min, and the rotating speed of the main shaft is 30 rpm/min. The pressing amount of each pass is 1.5-2 mm/rpm. In order to prevent the rotary wheel from being over-high in local material bulge at the front edge, the radius of the circular bead of the rotary wheel is selected from R20-R30;
(4) the diameter of the large end of the workpiece is 1380mm, the diameter of the small end is 239.5mm, and the height of the workpiece is 164 mm.
5. A 2195 Al-Li alloy special-shaped cross-section structure and a spinning method thereof as claimed in claim 1, wherein: in the step S4, the quenching transfer time is not more than 15S, the quenching medium is water, the solid solution temperature is 520 ℃, and the solid solution heat preservation time is 60 min.
6. A 2195 Al-Li alloy special-shaped cross-section structure and a spinning method thereof as claimed in claim 1, wherein: s6, fixing the big end of the workpiece on the flange plate, ensuring that the parallel end face is not more than 0.2mm, clamping the small end of the workpiece, ensuring that the small end jumps not more than 0.2mm, machining the inner shape face, wherein the diameter of the big end is 1380.5mm +/-0.5 mm, the size of the small end is 239.5mm +/-0.5 mm, and the total height is 164 mm;
and the subsequent machining allowance of the outer surface is ensured to be more than 5mm, the wall thickness is detected, and the detection point with the thinnest wall thickness is not less than 10.5 mm.
7. A 2195 Al-Li alloy special-shaped cross-section structure and a spinning method thereof as claimed in claim 1, wherein: in step S7, the runout of the big end and the small end is not more than 0.03mm, and the diameter of the big end of the workpiece is equal to or less than the diameter of the big end of the workpiece after the outer shape surface is machined
Diameter of small end
The total height of the workpiece is 164mm, and the final wall thickness is ensured to be 5.5mm +/-0.15; the thickness meter detects the wall thickness, and the detection point with the thinnest wall thickness is not less than 5.5 mm.
8. A 2195 Al-Li alloy special-shaped cross-section structure and a spinning method thereof as claimed in claim 1, wherein: in the step S8, an aluminum alloy air circulation furnace is adopted for artificial aging, a flat furnace loading mode is adopted, the aging temperature is 190 ℃, and the aging heat preservation time is 18 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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