CN113926905B - Superplastic forming die and forming method for variable-section titanium alloy shell part - Google Patents
Superplastic forming die and forming method for variable-section titanium alloy shell part Download PDFInfo
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- CN113926905B CN113926905B CN202111236144.3A CN202111236144A CN113926905B CN 113926905 B CN113926905 B CN 113926905B CN 202111236144 A CN202111236144 A CN 202111236144A CN 113926905 B CN113926905 B CN 113926905B
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 24
- 239000007921 spray Substances 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 11
- 238000000465 moulding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Classifications
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/053—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure characterised by the material of the blanks
- B21D26/055—Blanks having super-plastic properties
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A variable cross-section titanium alloy housing part superplastic forming die, comprising: a forming male die and a forming female die; the forming male die is provided with a male die surface, and the forming female die is provided with a female die surface; a pressure cavity is arranged in the molded surface of the male die, an air inlet hole is arranged on the forming male die and communicated with the pressure cavity, and an air inlet pipe is arranged on the air inlet hole; and an exhaust hole is arranged at the bottom of the forming female die and extends upwards to the molded surface of the female die. When superplastic forming is carried out, a closed pressure space is formed between the blank and a pressure cavity on the molded surface of the male die, after the blank is heated to superplastic temperature, the blank generates superplastic deformation under the action of gas pressure, the blank is completely attached to the molded surface of the female die to obtain a front shell half part of the spray pipe II section, and the front shell half parts of the two spray pipe II sections are welded to obtain a front shell part of the spray pipe II section.
Description
Technical Field
The invention relates to the technical field of aeroengine part forming processing, in particular to a superplastic forming die and a forming method for a variable-section titanium alloy shell part.
Background
The front shell part (structure shown in figures 1 and 2) of the jet pipe II section of the aero-engine is formed by a variable-section titanium alloy sheet metal part with one end being a circle and the other end being an ellipse, wherein the major axis of the ellipse is larger than the diameter of the circle, and the minor axis of the ellipse is smaller than the diameter of the circle; the technical conditions of the parts require no more than 2 longitudinal welds along the bus.
The titanium alloy part is difficult to form at normal temperature due to strong toughness, high viscosity, poor moisture and heat conduction, small elastic modulus and strong chemical affinity at normal temperature, and the forming precision is not high. The part is formed by adopting the traditional thermoforming method, and the shape correction can not be realized due to the variable cross-section structural characteristics of the part, so that the part meeting the product precision requirement can not be obtained.
Disclosure of Invention
The invention mainly aims to provide a superplastic forming die and a forming method for a variable-section titanium alloy shell part, and aims to solve the technical problems.
In order to achieve the above purpose, the invention provides a superplastic forming die for a variable cross-section titanium alloy shell part, which comprises: a forming male die and a forming female die; the forming male die is provided with a male die surface, and the forming female die is provided with a female die surface; a pressure cavity is arranged in the molded surface of the male die, an air inlet hole is arranged on the forming male die and communicated with the pressure cavity, and an air inlet pipe is arranged on the air inlet hole; and an exhaust hole is arranged at the bottom of the forming female die and extends upwards to the molded surface of the female die.
Preferably, the die surface comprises a first area and second areas at the front side and the rear side of the first area; the shape of the first area is consistent with the shape of the front shell half part of the second section of the spray pipe, and the second area is in smooth transition with the first area; the clearance between the male die profile and the female die profile is 1.0-1.1 times of the thickness of the half part of the front shell of the jet pipe II section.
Preferably, the second areas on the front side and the rear side of the first area are respectively provided with a rib groove; the rib is arranged on the molded surface of the male die; the left and right ends of the rib grooves at the two sides of the first area extend to the top surface of the forming female die and are connected to form a seal ring; ear plates are arranged on the left side and the right side of the forming male die, and two ends of an upper rib of the male die surface extend to the lower surfaces of the ear plates on the two sides of the forming male die and are connected to form a seal ring; the rib grooves correspond to the positions of the ribs.
Preferably, the exhaust hole is positioned between the edges of the two sides of the first area and the rib groove.
Preferably, a lightening hole is provided in the forming punch.
Preferably, an exhaust groove is arranged on the bottom plane of the forming female die, and the exhaust hole is communicated with the exhaust groove.
Preferably, a baffle is arranged on the front surface of the forming female die; when the forming male die and the forming female die are assembled, the baffle plate is blocked on the front end face of the forming male die.
Preferably, lifting bolts are respectively arranged on the forming male die and the forming female die.
The invention also provides a superplastic forming method of the variable-section titanium alloy shell part, which adopts the superplastic forming die of the variable-section titanium alloy shell part and comprises the following steps:
step S1: preparing a blank: the blank comprises a cone part and a flange edge, and the blank preparation steps are as follows: calculating the size of a plate according to the expansion size of the half part of the front shell of the spray pipe II section and the machining allowance, blanking by adopting the plate to obtain a fan-shaped rough material, rolling and bending the fan-shaped rough material to form a cone part, and bending to form a flange edge;
step S2: coating a protective layer and a graphite layer: coating Ti-1# protective layers on the upper and lower surfaces of the blank, the upper punch profile of the superplastic forming die, the die profile, the top surface of the forming die and the lower surface of the upper lug plate of the forming die, and then coating stone ink solution lubricant after drying, and naturally drying at room temperature;
step S3: superplastic forming: the method comprises the steps of installing a superplastic forming die on a hot press workbench, butting an air pipe of the hot press with an air inlet pipe of the die, heating hot press equipment and the superplastic forming die to a first set temperature, placing blank materials into the superplastic forming die and preserving heat, placing flange edges of the blank materials on the top surface of a forming female die, placing the rest part of a conical cylinder part on the blank materials on a second area of a female die molded surface, closing a die of a forming male die and the forming female die to compress the blank materials after the blank materials are heated to the first set temperature, filling argon into the air inlet pipe and preserving pressure, taking out parts when the temperature is reduced to the second set temperature, and naturally cooling to obtain semi-formed parts;
step S4: cleaning the semi-formed part obtained in the step S3 to remove graphite; and (3) carrying out linear cutting after scribing to obtain a front shell half part of the jet pipe II section, and welding the front shell half parts of the two jet pipe II sections to obtain the front shell part of the jet pipe II section.
Preferably, in the step S1, a TA15 plate is adopted for blanking; in the step S3, the first set temperature is 800-1000 ℃, and the second set temperature is 400-700 ℃; the welding mode in the step S4 is laser welding.
Compared with the prior art, the invention has the following beneficial effects:
(1) When the superplastic forming die provided by the invention is used for superplastic forming, a closed pressure space is formed between the blank and the pressure cavity on the molded surface of the male die, after the blank is heated to superplastic temperature, the blank is subjected to superplastic deformation under the action of gas pressure, and is completely attached to the molded surface of the female die to obtain a front shell half part of a spray pipe II section, and the two front shell half parts of the spray pipe II section are welded to obtain the front shell part of the spray pipe II section.
(2) The rib is arranged on the forming male die, the rib groove is arranged on the forming female die, and the rib groove tightly press blank materials and play a role in sealing when the dies are assembled, so that the sealing performance of the superplastic forming die is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a nozzle II section front housing part;
FIG. 2 is a cross-sectional view of the nozzle II section forward housing part taken along line A-A of FIG. 1;
FIG. 3 is a schematic perspective view of a superplastic forming die for a variable cross-section titanium alloy shell part, provided by the invention;
FIG. 4 is a front view of a superplastic forming die for a variable cross-section titanium alloy shell part provided by the invention;
FIG. 5 is a schematic view of the structure of the forming punch of the present invention;
FIG. 6 is a schematic view of the structure of a forming die according to the present invention;
FIG. 7 is a cross-sectional view taken along line B-B of FIG. 4;
FIG. 8 is a cross-sectional view taken along line C-C of FIG. 4
FIG. 9 is a front view of the nozzle II section front housing half piece;
FIG. 10 is a left side view of the front housing half of the nozzle section II;
FIG. 11 is a front view of a blank according to the present invention;
FIG. 12 is a right side view of the blank of the present invention;
FIG. 13 is a top view of a blank according to the present invention;
FIG. 14 is a front view of a semi-formed part of the present invention;
FIG. 15 is a cross-sectional view taken along line D-D of FIG. 14;
FIG. 16 is a top view of a semi-formed part according to the present invention;
reference numerals illustrate: 1-a front shell part of a spray pipe II section; 2-the front shell of the spray pipe II section is divided into half parts; 3-blank; 31-a cone section; 32-flange edges; 4-semi-formed part-; 100-forming a male die; 101-a male die profile; 102-a pressure chamber; 103-an air inlet hole; 104-an air inlet pipe; 105-tendons; 106-lightening holes; 107-earplates; 200-forming a female die; 201-a female die profile; 2011-first region; 2012-a second region; 202-an exhaust hole; 203-rib grooves; 204-an exhaust slot; 300-baffle; 400-lifting bolt.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
As shown in fig. 1, a schematic structural diagram of a front housing part 1 of a spray pipe section ii is shown, the part is a variable-section titanium alloy sheet metal part with one end being a circle and the other end being an ellipse, the major axis of the ellipse is larger than the diameter of the circle, and the short axis of the ellipse is smaller than the diameter of the circle, namely, the positive end of the part in the X direction is a circle, the negative end of the part in the X direction is an ellipse, and the part gradually transits from the ellipse to the circle along the X direction; the material of the front shell part 1 of the jet pipe II section is TA15.
As shown in fig. 9 and 10, the schematic structural diagram of the front casing half part 2 of the nozzle ii is shown, the front casing half part 2 of the nozzle ii is a half part of the front casing part 1 of the nozzle ii which is divided into two parts along the symmetry plane where the major axis of the ellipse is located, the positive end of the X direction is semicircular, the negative end of the X direction is semi-elliptical, and the front casing half part 2 of the nozzle ii has a semi-elliptical shape along the X direction and gradually transitions to semicircular.
As shown in fig. 11 to 13, the blank 3 of the present invention is schematically structured, and the blank 3 includes a half-cone-shaped cone portion 31 and flange edges 32 on both sides of the cone portion 31.
Fig. 1 to 8 show a specific embodiment of a superplastic forming mold for a variable-section titanium alloy shell part, where the superplastic forming mold includes: a forming punch 100 and a forming die 200; a punch profile 101 is provided on the forming punch 100, and a die profile 201 is provided on the forming die 200; a pressure cavity 102 is arranged in the male die molded surface 101, an air inlet 103 is arranged on the forming male die 100 and communicated with the pressure cavity 102, and an air inlet pipe 105 is arranged on the air inlet 103; an air vent 202 is provided in the bottom of the forming die 200, said air vent 202 extending up to said die profile 201.
In this embodiment, as shown in fig. 5 and 6, the die surface 201 includes a first area 2011, and second areas 2012 on both front and rear sides of the first area 2011; the shape of the first area 2011 is consistent with that of the front shell half part of the section II of the spray pipe, and the second area 2012 is in smooth transition with the first area 2011; the gap between the male die profile 101 and the female die profile 201 is 1.0-1.1 times of the thickness of the half part of the front shell of the second section of the spray pipe, in this embodiment, the materials of the forming male die 100 and the forming female die 200 are Ni7N, and the scaling factors are calculated according to the linear expansion coefficients of the die materials and TA15, and the scaling factors of the female die profile 201 and the male die profile 101 are 0.8-1.0.
In the present embodiment, as shown in fig. 5 and 6, rib grooves 203 are respectively provided on the second regions 2012 on the front and rear sides of the first region 2011, and the distance between the rib grooves 203 and the edge of the first region 2011 in the X direction is 20mm; in addition, the area of the pressure chamber 102 projected on the XY plane is larger than the area of the first region 2011 projected on the XY plane, and the distance from the edge of the pressure chamber 102 on the punch surface 101 to the edge of the first region 2011 in the X direction is 15mm. Ribs 105 are provided on the punch profile 101; the left and right ends of the rib grooves 203 on the two sides of the first area 2011 extend to the top surface of the forming die 200 and are connected to form a seal ring shape; ear plates 107 are arranged on the left side and the right side of the forming male die 100, and two ends of an upper rib 105 of the male die surface 101 extend to the lower surfaces of the ear plates 107 on the two sides of the forming male die 100 and are connected to form a seal ring; the rib grooves 203 correspond to the positions of the ribs 105. When the blank 3 is subjected to superplastic forming, the flange 31 of the blank 3 is placed on the top surface of the forming die 200, the rest of the conical part 31 of the blank 3 is placed on the second region 2012 of the die surface 201, when the forming punch 100 and the forming die 200 are clamped, the lower surfaces of the lugs 107 on both sides of the forming punch 100 press the flange 31 of the blank 3 on the top surfaces on both sides of the forming die 200, and the rest of the conical part 31 of the blank 3 is pressed on the second region 2012 of the die surface 201 in the region outside the pressure cavity 102 on the punch surface 101, so that the pressure cavity 102 forms a closed pressure space through the structure of the cooperation of the rib grooves 203 and the ribs 105.
In this embodiment, as shown in fig. 6, the exhaust holes 202 are located at positions between the edges of the two sides of the first area 2011 and the rib groove 203, specifically, the number of the exhaust holes 202 is two, and the exhaust holes 202 are distributed along the X direction and located on two sides of the first area 2011, and the distance between the exhaust holes 202 and the edges of the first area 2011 is 10mm. The exhaust hole 202 is located outside the first area 2011, so that damage to the surface of the molded part caused by the exhaust hole 202 can be avoided.
In this embodiment, as shown in fig. 5, a lightening hole 106 is provided in the forming punch 100. The lightening holes 106 are provided for lightening the weight of the forming punch 100, facilitating the lifting movement of the mold.
In this embodiment, as shown in fig. 6, a vent groove 205 is provided on the bottom surface of the molding die 200, and the vent hole 202 is connected to the vent groove 205.
In this embodiment, as shown in fig. 1 and 2, a baffle 300 is disposed on the front surface of the molding die 100; when the forming punch 100 and the forming die 200 are clamped, the baffle 300 is abutted against the front end face of the forming punch 100, specifically, the baffle 300 is arranged on the end face of the semicircular end of the die surface 201, and the baffle 300 is arranged to position the forming punch 100 when clamping and position the blank 3 when placing the blank 3 because the die surface 201 takes a shape inclined downwards along the positive direction X.
In this embodiment, a lifting bolt 400 is provided on each of the molding punch 100 and the molding die 200. The provision of the lifting bolt 400 facilitates the lifting movement of the mold.
The invention also provides a superplastic forming method of the variable-section titanium alloy shell part, which adopts the superplastic forming die of the variable-section titanium alloy shell part and comprises the following steps:
step S1: preparing a blank 3: the blank 3 comprises a cone part 31 and a flange 32, and comprises the following steps: calculating the size of a plate according to the expansion size of the front shell half part 2 of the spray pipe II section and the machining allowance, blanking by adopting a TA15 plate to obtain a fan-shaped blank, rolling and bending the fan-shaped blank to form a cone part 31, and bending to form a flange edge 32;
step S2: coating a protective layer and a graphite layer: coating Ti-1# protective layers on the upper and lower surfaces of the blank 3, the upper punch profile 101, the die profile 201, the top surface of the forming die 200 and the lower surface of the upper lug plate 107 of the forming punch 100 of a superplastic forming die, and then coating graphite solution lubricant after drying, and naturally drying at room temperature;
step S3: superplastic forming: the superplastic forming die is arranged on a working table of a hot press, an air pipe of the hot press is in butt joint with an air inlet pipe 103 of the die, the hot press equipment and the superplastic forming die are heated to a first set temperature of 800-1000 ℃, a blank 3 is placed in the superplastic forming die and is kept warm, a flange edge 31 of the blank 3 is placed on the top surface of a forming die 200, the rest part of a conical cylinder 31 on the blank 3 is placed on a second area 2012 of a die surface 201, after the blank 3 is heated to the first set temperature of 800-1000 ℃, the forming punch 100 and the forming die 200 are clamped to compress the blank 3, argon is filled into the air inlet pipe 103 and is kept pressure, the part is taken out when the temperature is lowered to a second set temperature of 400-700 ℃, and the semi-formed part 4 is obtained after natural cooling;
step S4: cleaning the semi-formed part 4 obtained in the step S3 to remove graphite; and (3) carrying out linear cutting after scribing to obtain a front shell half part 2 of the jet pipe II section, and carrying out laser welding on the two front shell half parts 2 of the jet pipe II section to obtain a front shell part 1 of the jet pipe II section.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (8)
1. The forming method of the variable-section titanium alloy shell part superplastic forming die is characterized in that the variable-section titanium alloy shell part superplastic forming die comprises the following steps: a forming male die (100) and a forming female die (200);
a male die profile (101) is arranged on the forming male die (100), and a female die profile (201) is arranged on the forming female die (200);
a pressure cavity (102) is arranged in the male die molded surface (101), an air inlet hole (103) is arranged on the forming male die (100) and communicated with the pressure cavity (102), and an air inlet pipe (105) is arranged on the air inlet hole (103);
an exhaust hole (202) is formed in the bottom of the forming female die (200), and the exhaust hole (202) extends upwards to the female die molded surface (201);
the female die profile (201) comprises a first area (2011) and second areas (2012) on the front side and the rear side of the first area (2011); the shape of the first area (2011) is consistent with that of the front shell half part of the section II of the spray pipe, and the second area (2012) is in smooth transition with the first area (2011); the gap between the male die molded surface (101) and the female die molded surface (201) is 1.0-1.1 times of the thickness of the front shell half part of the jet pipe II section;
ear plates (107) are arranged on the left side and the right side of the forming male die (100), and two ends of an upper rib (105) of the male die profile (101) extend to the lower surfaces of the ear plates (107) on the two sides of the forming male die (100) and are connected to form a seal ring;
the forming method of the superplastic forming die for the variable-section titanium alloy shell part comprises the following steps:
step S1: preparing a blank (3): the blank (3) comprises a cone part (31) and a flange (32), and the blank preparation steps are as follows: calculating the size of a plate according to the expansion size of the front shell half part (2) of the second section of the spray pipe and the machining allowance, blanking by adopting the plate to obtain a fan-shaped blank, rolling and bending the fan-shaped blank to form a cone section (31), and bending to form a flange edge (32);
step S2: coating a protective layer and a graphite layer: coating Ti-1# protective layers on the upper surface and the lower surface of a blank (3), as well as the upper punch profile (101), the female die profile (201), the top surface of a forming female die (200) and the lower surface of an upper lug plate (107) of the forming male die (100), coating graphite solution lubricant after drying, and naturally drying at room temperature;
step S3: superplastic forming: the superplastic forming die is arranged on a hot press working table, an air pipe of the hot press is in butt joint with an air inlet pipe (103) of the die, hot press equipment and the superplastic forming die are heated to a first set temperature, a blank (3) is placed in the superplastic forming die and is kept warm, a flange edge (31) of the blank (3) is placed on the top surface of a forming female die (200), the rest part of a conical cylinder part (31) on the blank (3) is placed on a second area (2012) of a female die molded surface (201), after the blank (3) is heated to the first set temperature, a forming male die (100) and a forming female die (200) are closed to compress the blank (3), argon is filled into the air inlet pipe (103) and is kept pressure, the part is taken out when the temperature is reduced to a second set temperature, and the semi-formed part (4) is obtained after natural cooling;
step S4: cleaning the semi-formed part (4) obtained in the step S3 to remove graphite; and (3) carrying out linear cutting after scribing to obtain a front shell half part (2) of the jet pipe II section, and welding the two front shell half parts (2) of the jet pipe II section to obtain a front shell part (1) of the jet pipe II section.
2. The method for forming the superplastic forming die for the variable-section titanium alloy shell part according to claim 1, wherein the method comprises the following steps: the second areas (2012) on the front side and the rear side of the first area (2011) are respectively provided with a rib groove (203); ribs (105) are arranged on the male die surface (101);
the left and right ends of the rib grooves (203) at the two sides of the first area (2011) extend to the top surface of the forming female die (200) and are connected to form a seal ring shape;
the rib grooves (203) correspond to the positions of the ribs (105).
3. The method for forming the superplastic forming die for the variable-section titanium alloy shell part according to claim 2, wherein the method comprises the following steps: the exhaust hole (202) is positioned between the edges of the two sides of the first area (2011) and the rib groove (203).
4. The method for forming the superplastic forming die for the variable-section titanium alloy shell part according to claim 1, wherein the method comprises the following steps: a lightening hole (106) is provided in the forming punch (100).
5. The method for forming the superplastic forming die for the variable-section titanium alloy shell part according to claim 1, wherein the method comprises the following steps: an exhaust groove (205) is formed in the bottom plane of the forming female die (200), and the exhaust hole (202) is communicated with the exhaust groove (205).
6. The method for forming the superplastic forming die for the variable-section titanium alloy shell part according to claim 1, wherein the method comprises the following steps: a baffle (300) is arranged on the front surface of the forming female die (100); when the forming male die (100) and the forming female die (200) are clamped, the baffle plate (300) is abutted against the front end surface of the forming male die (100).
7. The method for forming the superplastic forming die for the variable-section titanium alloy shell part according to claim 1, wherein the method comprises the following steps: lifting bolts (400) are respectively arranged on the forming male die (100) and the forming female die (200).
8. The method for forming the superplastic forming die for the variable-section titanium alloy shell part according to claim 1, wherein the method comprises the following steps: in the step S1, a TA15 plate is adopted for blanking; in the step S3, the first set temperature is 800-1000 ℃, and the second set temperature is 400-700 ℃; the welding mode in the step S4 is laser welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111236144.3A CN113926905B (en) | 2021-10-22 | 2021-10-22 | Superplastic forming die and forming method for variable-section titanium alloy shell part |
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| BE819073A (en) * | 1973-08-23 | 1975-02-21 | SUPERPLASTIC ALLOY SHEET MOLDING PROCESS | |
| CN105344819A (en) * | 2015-11-27 | 2016-02-24 | 沈阳飞机工业（集团）有限公司 | Isothermal forming die of large-curvature titanium alloy covering part and forming method of isothermal forming die |
| CN107866458A (en) * | 2017-11-06 | 2018-04-03 | 北京航星机器制造有限公司 | A kind of change coefficient of friction realizes manufacturing process of the High temperature bulging from feed supplement |
| CN109201838A (en) * | 2017-11-24 | 2019-01-15 | 中国航空制造技术研究院 | A method of improving superplastic forming construction material performance |
| EP3461568A1 (en) * | 2017-09-29 | 2019-04-03 | Beijing Kohler Ltd. | A production method of bathroom hardware shells |
| CN111229948A (en) * | 2020-03-16 | 2020-06-05 | 沈阳飞机工业（集团）有限公司 | Superplastic forming die and method for large titanium alloy double-curvature angle part |
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| BE819073A (en) * | 1973-08-23 | 1975-02-21 | SUPERPLASTIC ALLOY SHEET MOLDING PROCESS | |
| CN105344819A (en) * | 2015-11-27 | 2016-02-24 | 沈阳飞机工业（集团）有限公司 | Isothermal forming die of large-curvature titanium alloy covering part and forming method of isothermal forming die |
| EP3461568A1 (en) * | 2017-09-29 | 2019-04-03 | Beijing Kohler Ltd. | A production method of bathroom hardware shells |
| CN107866458A (en) * | 2017-11-06 | 2018-04-03 | 北京航星机器制造有限公司 | A kind of change coefficient of friction realizes manufacturing process of the High temperature bulging from feed supplement |
| CN109201838A (en) * | 2017-11-24 | 2019-01-15 | 中国航空制造技术研究院 | A method of improving superplastic forming construction material performance |
| CN111229948A (en) * | 2020-03-16 | 2020-06-05 | 沈阳飞机工业（集团）有限公司 | Superplastic forming die and method for large titanium alloy double-curvature angle part |
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