CN112371776A - Vacuum thermal sizing die and method for engine support case - Google Patents
Vacuum thermal sizing die and method for engine support case Download PDFInfo
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- CN112371776A CN112371776A CN202011140327.0A CN202011140327A CN112371776A CN 112371776 A CN112371776 A CN 112371776A CN 202011140327 A CN202011140327 A CN 202011140327A CN 112371776 A CN112371776 A CN 112371776A
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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
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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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
- B21D53/00—Making other particular articles
- B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
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Abstract
The invention discloses a vacuum hot-sizing die and a method for an engine supporting case. During shape correction, a welded supporting casing is installed on a shaft assembly, an outer installation edge of a lower installation edge of a casing body is placed on the upper surface of a circular ring on the outer side of a boss of a lower circular disc, the inner surface of an inner installation edge of the lower installation edge of the casing body is positioned on the outer side of the lower circular disc of the shaft assembly and the outer surface of an inner correction ring of the lower installation edge, an installation edge in the casing body is positioned on the outer side of the installation edge shape correction ring in the casing body, a shape correction tire is inserted into a circular groove formed by the outer circular ring and the inner circular ring, a wedge block penetrates through a notch on the shape correction tire and the shaft assembly and is knocked until the wedge block cannot move, and finally, an upper end surface shape correction ring and an upper. The invention effectively solves the problem that the multi-layer thin-wall complex structure of the supporting case containing a plurality of welding seams deforms after welding, and ensures the requirements of the subsequent processing on the dimensional precision and the position precision.
Description
Technical Field
The invention belongs to the technical field of aeroengine processing and welding heat treatment shape correction, and particularly relates to a vacuum heat shape correction die and method for a titanium alloy engine support casing after welding.
Background
The turbofan engine supporting casing is an annular assembly (shown in figures 1 and 2) formed by combining and welding multiple layers of thin-wall parts, is formed by welding 60 parts, is complex in structure, has 104 welding seams with different shapes and positions, and is mainly made of TA15, TC2 and the like. Because of many welding seams and complex structure, the support casing has serious deformation after welding, and can not meet the requirements of subsequent internal and external installation dimensional tolerance and position degree.
Disclosure of Invention
The invention aims to provide a vacuum thermal shape correction die and a method for a welded supporting casing, which can effectively control the problem of welding deformation of a multi-layer thin-wall complex structure of the supporting casing by performing thermal treatment shape correction on a welded part.
The invention provides a post-welding vacuum thermal correction mold and a using method thereof by utilizing the characteristic of high-temperature softening of titanium alloy and according to the principle of expansion with heat and contraction with cold of materials, so that the welding deformation of a multi-layer complex structure of a supporting case is effectively controlled, and the subsequent processing requirements of parts are ensured.
The technical scheme of the invention is as follows:
the vacuum hot-sizing die for the engine supporting case comprises a shaft assembly, a sizing tire, an upper end surface sizing ring, an upper mounting edge sizing ring and a wedge block;
the shaft assembly is a disc type welding assembly and comprises a central shaft, a lower disc, an inner calibration ring at the lower mounting edge of the casing body of the casing, an inner calibration ring at the mounting edge of the casing body of the casing, an outer circular ring and an inner circular ring;
the lower disc is a circular ring with a boss, the lower disc is positioned at the lower end of the central shaft, the boss of the lower disc is positioned on the inner surface of the outer mounting edge of the lower mounting edge of the casing body, and the size of the boss is a1 times of the inner diameter of the outer mounting edge of the lower mounting edge of the casing body;
the inner diameter of the inner mounting edge of the lower mounting edge of the casing is a2 times of the inner diameter of the inner mounting edge of the lower mounting edge of the casing;
the mounting edge shape correcting ring in the casing is welded above the inner shape correcting ring at the lower mounting edge of the casing, the outer diameter of the mounting edge shape correcting ring in the casing is positioned on the inner surface of the mounting edge in the casing, and the size of the mounting edge shape correcting ring is a3 times of the inner diameter of the mounting edge in the casing;
the outer circular ring and the inner circular ring are two annular parts on the outer side of the lower disc, and a plurality of first notches which are uniformly distributed and used for the wedge blocks to pass through are formed in the outer circular ring and the inner circular ring;
the shape correcting tire is a conical cylindrical part, the shape of the conical cylinder is consistent with the shape of the inner surface of the front mounting edge, the size of the conical cylinder is a4 times of the size of the inner surface of the front mounting edge, a plurality of uniformly distributed avoiding grooves for supporting plates are formed in the lower surface of the shape correcting tire, the lower end of the shape correcting tire is inserted into a ring groove formed by the outer ring and the inner ring, a second notch for a wedge block to pass through is formed in the lower surface of the shape correcting tire, and the wedge block passes through the outer ring, the inner ring and the shape correcting tire;
the upper end surface calibration ring is an annular part, the lower end surface of the upper end surface calibration ring is provided with an installation edge calibration boss on the casing body and an installation edge calibration boss for the flow divider, the installation edge calibration bosses are respectively positioned on the inner side of the installation edge on the casing body and the inner side of the installation edge of the flow divider, and the sizes of the installation edge calibration boss and the installation edge calibration boss are respectively a5 times the inner diameters of the installation edge on the casing body and the installation edge of the flow divider;
the upper mounting side sizing ring is a shaft part, the inner diameter of the upper mounting side sizing ring is larger than or equal to the outer diameter of a central shaft of the shaft assembly, the outer diameter of the upper mounting side sizing ring is positioned on the inner side of the upper mounting side, and the size of the outer diameter of the upper mounting side sizing ring is a6 times of the inner diameter of the upper mounting side;
wherein a1, a2, a3, a4, a5 and a6 are scaling coefficients which are calculated according to the linear expansion coefficients of the die material and the titanium alloy at the setting temperature.
Further, the shaft assembly, the sizing tire, the upper end surface sizing ring and the upper mounting edge sizing ring are all made of 1Cr18N9 Ti.
Further, an eyebolt is installed at the upper end of the sizing tire, and an eyebolt is installed on the upper surface of the sizing ring at the upper end surface.
The vacuum thermal sizing method for the engine support casing adopts the vacuum thermal sizing die and comprises the following steps:
step one, mounting a welded supporting casing on a shaft assembly, placing an outer mounting edge of a lower mounting edge of a casing on the upper surface of a circular ring outside a boss of a lower disc, placing an inner surface of an outer mounting edge of the lower mounting edge of the casing on the outer side of the boss of the lower disc of the shaft assembly, placing an inner surface of an inner mounting edge of the lower mounting edge of the casing on the outer side of an inner correction ring of the shaft assembly, and placing a mounting edge in the casing on the outer side of the mounting edge correction ring in the casing; inserting the sizing tire into a ring groove formed by the outer ring and the inner ring, penetrating the wedge block through a second notch of the sizing tire and a first notch of the shaft assembly, and knocking the wedge block inwards until the wedge block cannot move; an upper end surface calibration ring and an upper mounting edge calibration ring are respectively mounted along the axial direction of the shaft assembly;
step two, putting the mounted parts and the mold into a vacuum furnace together, and closing a furnace door after the parts are properly placed and no pollutants are left on the surfaces of the parts and the hearth;
vacuumizing, starting heating when the vacuum degree is smaller than a set value, preserving heat for a period of time when the vacuum degree is heated to a set temperature, cooling along with the furnace, and discharging;
and step four, after the part and the die are completely cooled, detaching the upper end surface correcting ring, the upper mounting edge correcting ring and the correcting molding die, and taking out the part.
Optionally, in the third step, heating is started when the vacuum degree is less than 1.33Pa, the heating temperature is 565 +/-15 ℃, the temperature is kept for 150-180 min, and when the temperature is cooled to below 400 ℃ along with the furnace, argon is filled to 150 ℃, and the furnace is taken out for cooling
Compared with the prior art, the invention provides the mold and the method for vacuum thermal correction of the welded supporting casing, and the mold controls a plurality of mounting edges inside and outside the supporting casing during vacuum thermal treatment, so that the problem of deformation of the welded parts with the multilayer thin-wall complex structure after welding is effectively solved, and the requirements of subsequent processing on dimensional precision and position precision are met.
Drawings
FIG. 1 is a schematic view of a support case construction;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of a vacuum thermal sizing die of the present invention;
FIG. 4 is a schematic view of the shaft assembly construction of the present invention;
FIG. 5 is a schematic view of the diverter assembly.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.
The structure of the supporting casing required to be shaped in the embodiment is shown in fig. 1 and fig. 2: the supporting casing mainly comprises a casing body 1, an upper mounting edge 2, a front mounting edge 3, a support plate 4, a switching pipe 5 and a flow divider 6. The supporting casing shell 1 is a thin-wall conical cylindrical part with a lower mounting edge, the lower mounting edge is provided with an inner mounting edge and an outer mounting edge, the upper mounting edge 2 is welded on the upper end surface of the supporting casing shell 1 in a welding mode, and the front mounting edge 3 is an assembly formed by welding the upper mounting edge and the lower mounting edge with the thin-wall conical cylinder and is positioned on the outer ring of the supporting casing shell 1; the 10 support plates 4 are of a streamline hollow welding structure, the support plates 4 penetrate through the front mounting edge 3 and the conical surface of the supporting casing 1 to be respectively welded with the front mounting edge 3 and the supporting casing 1 to form a component, the 10 support plates 4 are uniformly distributed along the circumferential direction and are numbered as A1, A2, A3, A4, A5, A6, A7, A8, A9 and A10 support plates according to the clockwise direction, the inner sides of the A1, A4, A5 and A9 support plates are closed, adapter tubes 5 are arranged in the inner cavities of the A2, A3, A6, A7, A8 and A10 support plates, the adapter tubes 5 are provided with belts, and penetrate through the left end face and the right end face of the support plate and are connected with the left end face and the right end; as shown in fig. 2 and 5, the flow divider 6 is a welded part and is formed by welding a thin-wall annular part with a V-shaped section and a flow divider mounting edge, and the lower end face of the flow divider 6 is provided with 10 cut notches which are uniformly distributed, inserted on 10 support plates 4 and connected with the support plates 4 in a welding mode.
The mold for hot shape correction after welding of the support casing is shown in fig. 3 and 4 and mainly comprises a shaft assembly 7, a shape correction tire 8, an upper end surface correction ring 9, an upper mounting edge correction ring 10 and a wedge block 11.
The shaft assembly 7 is a disc-type welded assembly, the material is 1Cr18N9Ti, and the shaft assembly 7 mainly comprises a central shaft 7a, a lower disc 7b, an inner calibrating ring 7c arranged on the lower mounting edge of the casing body, an inner calibrating ring 7d arranged in the casing body, an outer circular ring 7e and an inner circular ring 7 f. The lower disc 7b is a circular ring with a boss, is positioned on the lower end face of the central shaft 7a and is connected with the central shaft 7a in a welding mode, and the boss of the lower disc 7b is positioned on the inner surface of the outer mounting edge of the lower mounting edge of the casing body 1 and has the size a times of the inner diameter of the outer mounting edge of the lower mounting edge of the casing body 1; the lower mounting edge inner calibration ring 7c of the casing is welded above the lower disc 7b, the outer diameter (namely the excircle surface) of the lower mounting edge inner calibration ring 7c of the casing is positioned on the inner surface of the inner mounting edge of the lower mounting edge of the casing 1, and the size of the outer mounting edge inner diameter is a times of the inner mounting edge inner diameter of the lower mounting edge of the casing 1; the mounting edge correcting ring 7d in the casing is welded above the mounting edge inner correcting ring 7c under the casing, the outer diameter (namely the outer circle surface) of the mounting edge correcting ring 7d in the casing is positioned on the inner surface of the mounting edge in the casing 1, and the size of the mounting edge correcting ring is a times of the inner diameter of the mounting edge in the casing 1; the outer circular ring 7e and the inner circular ring 7f form a pair of two annular parts welded on the outer side of the lower disc 7b, and 10 first notches which are uniformly distributed and used for the wedge blocks 11 to pass through are formed in the outer circular ring 7e and the inner circular ring 7 f;
the correction tyre 8 is a cone-shaped part made of 1Cr18N9Ti, the shape of the cone is consistent with the inner profile of the front mounting edge 3, the size of the cone is a times of the inner profile of the front mounting edge 3, the lower surface of the correction tire 8 is provided with 10 hiding grooves (the hiding grooves are not shown in figure 3, when the correction tire 8 is installed from top to bottom, because 10 supporting plates 4 are arranged between the inner ring and the outer ring of the supporting casing along the circumferential direction, in order to prevent the interference between the correction tire 8 and the supporting plates 4, the hiding grooves need to be opened), the lower end of the correction tire 8 is inserted into a ring groove formed by the outer ring 7e and the inner ring 7f, a second notch for the wedge block 11 to pass through is formed in the corresponding position of the lower surface of the sizing tire 8, the wedge block 11 passes through the outer ring 7e, the inner ring 7f and the sizing tire 8 to fix the sizing tire 8 and the shaft assembly 7, and a lifting bolt is installed at the upper end of the sizing tire 8 to facilitate hoisting;
the upper end face calibration ring 9 is an annular part, the material is 1Cr18N9Ti, the lower end face of the upper end face calibration ring 9 is provided with an installation side calibration boss on the casing shell 1 and an installation side calibration boss for the flow divider 6, the installation side calibration boss on the casing shell 1 is positioned on the inner side of the installation side of the casing shell 1, the installation side calibration boss for the flow divider 6 is positioned on the inner side of the installation side of the flow divider 6, the sizes of the installation side calibration boss are respectively a times of the inner diameters of the installation side of the casing shell 1 and the installation side of the flow divider 6, and the upper surface of the upper end face calibration ring 9 is also provided with a lifting ring bolt for facilitating hoisting;
the upper mounting side calibration ring 10 is a shaft part, the material is 1Cr18N9Ti, the inner diameter (i.e. inner hole) of the upper mounting side calibration ring 10 passes through the outer diameter (i.e. outer circle surface) of the central shaft 7a of the shaft assembly 7, the outer diameter (i.e. outer circle surface) of the upper mounting side calibration ring 10 is positioned on the inner side of the upper mounting side 2, and the size of the outer diameter (i.e. outer circle surface) is a times of the inner diameter of the upper.
And a is a scaling coefficient, the scaling coefficient is calculated according to the linear expansion coefficient of the die material 1Cr18N9Ti and the material linear expansion coefficient of the titanium alloy at the shape correcting temperature, and the value range of the calculated scaling coefficient a is 0.8-1.
The assembling and vacuum thermal shaping method of the vacuum thermal shaping mould and the parts of the supporting case comprises the following steps:
1. installing the welded supporting case on the shaft assembly 7, placing the outer installation edge of the lower installation edge of the case shell 1 on the upper surface of a circular ring outside a boss of a lower disc 7b, placing the inner surface of the outer installation edge of the lower installation edge of the case shell 1 on the outer side of the boss of the lower disc 7b of the shaft assembly 7, placing the inner surface of the inner installation edge of the lower installation edge of the case shell 1 on the outer side of an inner correction ring 7c of the shaft assembly 7, placing the installation edge of the case shell 1 on the outer side of an installation edge correction ring 7d in the case shell, and placing parts stably;
inserting the sizing tire 8 into the annular groove formed by the outer ring 7e and the inner ring 7f, paying attention to the fact that parts do not need to be touched during installation, enabling the wedge block 11 to penetrate through the second notch of the sizing tire 8 and the first notch of the shaft assembly 7, and knocking the wedge block 11 inwards by a hammer until the wedge block 11 cannot move;
an upper end surface calibration ring 9 and an upper mounting edge calibration ring 10 are respectively mounted along the axial direction of the shaft assembly 7 according to the positions shown in the figure;
2. putting the mounted parts and the mold into a vacuum furnace together, and closing the furnace door after the parts are properly placed and no pollutants are left on the surfaces of the parts and the hearth;
3. vacuumizing, starting heating when the vacuum degree is less than 1.33Pa, keeping the temperature at 565 +/-15 ℃, keeping the temperature for 150-180 min, cooling to below 400 ℃ along with the furnace, introducing argon to 150 ℃, discharging and cooling;
4. after the parts and the mold are completely cooled, the upper end surface calibration ring 9, the upper mounting edge calibration ring 10 and the calibration type tire 8 are disassembled, and the parts are taken out for inspection.
Claims (5)
1. Engine supporting machine casket vacuum thermal correction mould, its characterized in that: comprises a shaft assembly (7), a shape correcting tire (8), an upper end surface correcting ring (9), an upper mounting edge correcting ring (10) and a wedge-shaped block (11);
the shaft assembly (7) is a disc-type welding assembly and comprises a central shaft (7a), a lower disc (7b), an inner correcting ring (7c) arranged at the lower mounting edge of the casing body, an inner correcting ring (7d) arranged in the casing body, an outer ring (7e) and an inner ring (7 f);
the lower disc (7b) is a circular ring with a boss, the lower disc (7b) is positioned at the lower end of the central shaft (7a), the boss of the lower disc (7b) is positioned on the inner surface of the outer mounting edge of the lower mounting edge of the casing shell (1), and the size of the boss is a1 times of the inner diameter of the outer mounting edge of the lower mounting edge of the casing shell (1);
the inner adjusting ring (7c) of the lower mounting edge of the casing shell is arranged above the lower disc (7b), the outer diameter of the inner adjusting ring (7c) of the lower mounting edge of the casing shell is positioned on the inner surface of the inner mounting edge of the lower mounting edge of the casing shell (1), and the size of the inner adjusting ring is a2 times of the inner diameter of the inner mounting edge of the lower mounting edge of the casing shell (1);
a mounting edge correcting ring (7d) in the casing is welded above an inner correcting ring (7c) at the lower mounting edge of the casing, the outer diameter of the mounting edge correcting ring (7d) in the casing is positioned on the inner surface of the mounting edge in the casing (1), and the size of the mounting edge correcting ring is a3 times of the inner diameter of the mounting edge in the casing (1);
the outer circular ring (7e) and the inner circular ring (7f) are two annular parts on the outer side of the lower disc (7b), and a plurality of first notches which are uniformly distributed and used for the wedge-shaped blocks (11) to pass through are formed in the outer circular ring (7e) and the inner circular ring (7 f);
the shape correcting tire (8) is a conical cylindrical part, the shape of the conical cylinder is consistent with the inner profile of the front mounting edge (3), the size of the conical cylinder is a4 times of the inner profile of the front mounting edge (3), a plurality of uniformly distributed avoiding grooves for the support plate (4) are formed in the lower surface of the shape correcting tire (8), the lower end of the shape correcting tire (8) is inserted into a ring groove formed by the outer ring (7e) and the inner ring (7f), a second notch for the wedge block (11) to pass through is formed in the lower surface of the shape correcting tire (8), and the wedge block (11) passes through the outer ring (7e), the inner ring (7f) and the shape correcting tire (8);
the upper end surface calibration ring (9) is an annular part, the lower end surface of the upper end surface calibration ring (9) is provided with an installation side calibration boss on the casing shell (1) and an installation side calibration boss for the flow divider (6), the installation side calibration bosses are respectively positioned on the inner side of the installation side on the casing shell (1) and the inner side of the installation side of the flow divider (6), and the sizes of the installation side calibration bosses and the installation side calibration bosses are respectively a5 times of the inner diameters of the installation side on the casing shell (1) and the installation side of the flow divider (6);
the upper mounting side calibration ring (10) is a shaft part, the inner diameter of the upper mounting side calibration ring (10) is larger than or equal to the outer diameter of a central shaft (7a) of the shaft assembly (7), the outer diameter of the upper mounting side calibration ring (10) is positioned on the inner side of the upper mounting side (2), and the size of the outer diameter is a6 times of the inner diameter of the upper mounting side (2);
wherein a1, a2, a3, a4, a5 and a6 are scaling coefficients which are calculated according to the linear expansion coefficients of the die material and the titanium alloy at the setting temperature.
2. The engine support case vacuum thermal shaping mold of claim 1, wherein: the shaft assembly (7), the sizing tire (8), the upper end surface sizing ring (9) and the upper mounting edge sizing ring (10) are all made of 1Cr18N9 Ti.
3. The engine support case vacuum thermal shaping mold of claim 1, wherein: and the upper end of the shape correcting tire (8) is provided with a lifting bolt, and the upper surface of the upper end surface shape correcting ring (9) is provided with a lifting bolt.
4. A method of vacuum thermal profiling of an engine support case, using the vacuum thermal profiling mold of claim 1, 2 or 3, comprising the steps of:
step one, mounting a welded supporting casing on a shaft assembly (7), placing an outer mounting edge of a lower mounting edge of a casing (1) on the upper surface of a circular ring outside a boss of a lower disc (7b), placing an inner surface of the outer mounting edge of the lower mounting edge of the casing (1) on the outer side of the boss of the lower disc (7b) of the shaft assembly (7), placing an inner surface of an inner mounting edge of the lower mounting edge of the casing (1) on the outer side of an inner correcting ring (7c) of the shaft assembly (7), and placing a mounting edge in the casing (1) on the outer side of a mounting edge correcting ring (7d) in the casing; inserting the sizing tire (8) into a ring groove formed by the outer ring (7e) and the inner ring (7f), penetrating the wedge block (11) through a second notch of the sizing tire (8) and a first notch of the shaft assembly (7), and knocking the wedge block (11) inwards until the wedge block cannot move; an upper end surface calibration ring (9) and an upper mounting edge calibration ring (10) are respectively mounted along the axial direction of the shaft assembly (7);
step two, putting the mounted parts and the mold into a vacuum furnace together, and closing a furnace door after the parts are properly placed and no pollutants are left on the surfaces of the parts and the hearth;
vacuumizing, starting heating when the vacuum degree is smaller than a set value, preserving heat for a period of time when the vacuum degree is heated to a set temperature, cooling along with the furnace, and discharging;
and step four, after the part and the die are completely cooled, detaching the upper end surface correction ring (9), the upper mounting edge correction ring (10) and the correction molding die (8), and taking out the part.
5. The engine support case vacuum thermal profiling method of claim 4, wherein: and in the third step, heating is started when the vacuum degree is less than 1.33Pa, the heating temperature is 565 +/-15 ℃, the temperature is kept for 150-180 min, and when the temperature is cooled to be below 400 ℃ along with the furnace, argon is filled to 150 ℃, and the furnace is taken out for cooling.
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| CN202011140327.0A CN112371776B (en) | 2020-10-22 | 2020-10-22 | Vacuum thermal sizing die and method for engine support case |
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| CN202011140327.0A CN112371776B (en) | 2020-10-22 | 2020-10-22 | Vacuum thermal sizing die and method for engine support case |
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| CN112371776B CN112371776B (en) | 2023-03-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115070341A (en) * | 2022-06-22 | 2022-09-20 | 江苏图南合金股份有限公司 | Method for eliminating deformation of K4169 alloy aeroengine casing casting |
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