CN115647181A - Cold forming method for flexible medium of large-diameter titanium alloy inner U-shaped inner ring - Google Patents
Cold forming method for flexible medium of large-diameter titanium alloy inner U-shaped inner ring Download PDFInfo
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- CN115647181A CN115647181A CN202211355264.XA CN202211355264A CN115647181A CN 115647181 A CN115647181 A CN 115647181A CN 202211355264 A CN202211355264 A CN 202211355264A CN 115647181 A CN115647181 A CN 115647181A
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Abstract
The invention discloses a cold forming method of a flexible medium of a large-diameter titanium alloy inner U-shaped inner ring, which comprises the following steps: designing a forming scheme; step two: designing a processing flow; step three: installing a mould; step four: forming and processing; step five: measuring three coordinates; step six: turning; the invention adopts semisolid, flowable, high molecular polymer with certain speed sensitivity and higher viscosity, namely viscous medium, as a soft male die for forming, and forms a product meeting the size requirement. The invention has the advantages of low mold manufacturing cost, simple operation process, short processing period, strong conversion capability of adapting to the change of product requirements and the like, and can meet the requirements of high efficiency, high quality and low cost.
Description
Technical Field
The invention relates to the technical field of manufacturing of aero-engines, in particular to a cold forming method for a flexible medium of a large-diameter titanium alloy inner U-shaped inner ring.
Background
The inner ring of the booster-stage stator of the aero-engine is made of a titanium alloy TA1 plate with the thickness of 1.0mm, the structure of a part is shown in figures 1 and 2, the section of the part is in a U shape with an inward notch, the maximum diameter is 818mm, the diameters of upper and lower ports are smaller than the diameter of an intermediate profile, the conventional steel die cold forming method cannot be realized due to the large elastic modulus and high yield ratio of the titanium alloy at room temperature, and a common whole ring forming die cannot be taken out due to the limitation of the structure of the part, so that the conventional forming process adopts a process of distinguishing hot forming, welding and hot forming, and the specific processing process flow is as follows: the method comprises the following steps of laser four-section fan-ring-shaped blank, roll bending, graphite coating, thermoforming by a thermoforming machine to form 1/4 arc sections, washing, graphite removal, corrosion, linear cutting, welding 4 1/4 arc sections into a whole ring, fine grinding of welding seams, stress relaxation thermoforming and turning. The process has long processing period and high manufacturing cost, and the die has short service life after repeated heating and cooling and needs to be repaired or replaced frequently.
Disclosure of Invention
In order to solve the technical problems, a cold forming method of a large-diameter titanium alloy inner U-shaped inner ring flexible medium is provided, and the specific technical scheme is as follows:
a cold forming method for a large-diameter titanium alloy inner U-shaped inner ring flexible medium comprises the following steps:
the method comprises the following steps: design of forming scheme
Combining the size and the shape of the part, and providing a titanium alloy TA1 conical cylinder according to the forming principle and the characteristics of a viscous medium;
step two: design of process flow
A processing process flow of viscous medium cold forming is provided by combining a titanium alloy inner U-shaped inner ring structure:
(1) Blank preparation
(1) Processing a TA1 plate with the thickness of 1mm into two fan-shaped blocks by using a laser cutting machine;
(2) adopting a roll bending machine to divide the two fan-shaped blocks into two semi-conical cylinders;
(3) welding the two semi-conical cylinders into a conical cylinder by adopting an automatic argon arc welding machine;
(4) polishing the welding line to be level with the base body;
(5) annealing treatment is carried out by adopting a vacuum heat treatment furnace;
(2) Blank design
Combining the part structure, and designing the structure and the size of a blank for forming;
(3) Design of forming die
Designing a viscous medium forming die;
step three: mounting die
(1) The medium cylinder is arranged on a lower platform of the four-column hydraulic press, the position of the medium cylinder body corresponds to that of the ejector rod, so that the ejector rod can move up and down along the cylinder body, and the outer diameter of the ejector rod is precisely matched with the inner diameter of the cylinder body to play a role in sealing viscous media;
(2) Mounting a forming die on a lower platform of a four-column hydraulic press, wherein a medium cylinder body is positioned in inner holes of a lower base plate and a cushion block, and the upper end face of the cylinder body is ensured to be precisely attached to the lower end face of a core die;
(3) Placing the titanium alloy conical barrel blank into the upper end surface of the lower backing plate along the molded surface of the 4-concave die;
(4) Placing the core mold with the sealing ring on the upper end surface of the lower backing plate;
(5) The plug is placed in the center of the lower end face of the upper base plate and is fixedly connected with the upper base plate through 2M 18 bolts, and the upper base plate is placed above the mold and is fixedly connected with the core mold through 6M 18 hexagon socket head cap bolts.
Step four: shaping process
(1) Starting an upper platform of the four-column hydraulic press, and providing a mold closing force by an equipment main slide block, wherein the size of the mold closing force is 820 tons;
(2) Starting the equipment ejection cylinder to apply viscous medium pressure, wherein the pressure of the viscous medium is 90MPa; when the pressure of the viscous medium reaches 90MPa, unloading the pressure of the viscous medium; meanwhile, the main slide block moves upwards, and the core mold is taken out through the backing plate;
(3) Checking the blank fitting stroke degree through an R gauge, and taking out the test piece when the minimum fillet radius of the test piece reaches R3; if the relevant size is not reached, repeating the above actions and increasing the pressure of the viscous medium appropriately;
step five: three-coordinate measurement
Measuring the size of the stator inner ring by using a three-coordinate measuring machine;
step six: turning process
And machining the upper and lower rabbets of the formed stator inner ring to final sizes by adopting a lathe.
The preferred scheme of the cold forming method for the flexible medium of the large-diameter titanium alloy inner U-shaped inner ring is that in the second step (3), the viscous medium forming die comprises a plug, an upper base plate, a core die, a female die, a jacket, a lower base plate and a cushion block;
the cushion block is arranged at the lower end of the lower base plate, the size of the cushion block is consistent with that of an inner hole of the lower base plate, and the cushion block and the inner hole of the lower base plate are symmetrically arranged up and down to form a cavity;
the outer sleeve is sleeved on the outer side of the female die and arranged on the lower backing plate;
an upper platform of the four-column hydraulic machine is tightly pressed on the upper surface of the upper base plate;
a concave platform is arranged in the center of the core mold, and a flow channel structure arranged in the core mold is communicated with the concave platform;
the core mold is connected to the lower surface of the upper base plate, and the concave table is clamped in the center of the upper base plate;
the plug is installed in a groove reserved in the lower surface of the upper base plate and the core mold through a screw, and the plug is matched with the core mold flow passage;
a groove is arranged in the core mold;
the groove is sealed by a YX-shaped section sealing ring;
the medium cylinder is arranged in a cavity formed by the centers of the cushion block and the lower cushion plate,
the lower end face of the medium cylinder is jacked up through a jacking rod of the hydraulic machine, so that the viscous medium in the medium cylinder is jacked up, the viscous medium in the medium cylinder is jacked into a flow channel of the core mold through the sealing and jacking of the plug, the pressure of the viscous medium is further transmitted to the blank, the blank is expanded to the molded surface of the female mold by the viscous medium, and the part is formed.
The invention has the beneficial effects that:
the invention has been applied to finish the forming trial production of 4 booster-level zero-order stator inner rings, the height tolerance of the formed parts is within 0.2mm, the dimensional tolerance of three main diameters is within 0.8mm, the fillet radius reaches R3, and the design requirements of the parts are met.
Compared with the traditional titanium alloy hot forming process, the invention greatly shortens the processing time, reduces the processing cost and prolongs the service life of the die. The method has the advantages of simple operation process, strong conversion capability of adapting to the change of product requirements and the like, can meet the requirements of low cost and high quality of sheet metal parts with various types, small batches and complex shapes, and has wide application prospect in aeroengines and gas turbines.
Drawings
FIG. 1 is a schematic view of a part structure;
FIG. 2 is a schematic cross-sectional view of a part;
FIG. 3 is a schematic view of a forming scheme;
FIG. 4 is a schematic view of a forming die;
FIG. 5 is a schematic view of the axial groove dimensions for the YX seal ring;
FIG. 6 is a schematic view of a mandrel configuration;
fig. 7 is a schematic view of the construction of the media cylinder.
In the figure: 1-plug, 2-upper backing plate, 3-core mould, 4-concave mould, 5-coat, 6-lower backing plate, 7-cushion block, 8-cavity and 9-groove.
Detailed Description
The invention will be described in more detail with reference to the following embodiments in conjunction with fig. 1-7.
Example 1
A cold forming method for a large-diameter titanium alloy inner U-shaped inner ring flexible medium comprises the following steps:
the method comprises the following steps: design of forming scheme
Combining the size and the shape of the part, and providing a titanium alloy TA1 conical cylinder according to the forming principle and the characteristics of a viscous medium;
step two: design of process flow
A processing process flow of viscous medium cold forming is provided by combining a titanium alloy inner U-shaped inner ring structure:
(1) Blank preparation
(1) Processing a TA1 plate with the thickness of 1mm into two fan-shaped blocks by using a laser cutting machine;
(2) adopting a roll bending machine to divide the two fan-shaped blocks into two semi-conical cylinders;
(3) welding the two semi-conical cylinders into a conical cylinder by adopting an automatic argon arc welding machine;
(4) polishing the welding line to be level with the base body;
(5) annealing treatment is carried out by adopting a vacuum heat treatment furnace;
by adopting the viscous medium as the flexible male die, the abrasion of the die is reduced, and the service life of the die is prolonged.
(2) Blank design
Designing a blank structure and size for molding by combining a part structure; the blank is welded into a conical cylinder as shown in figure 5 by two TA1 plates, the minimum diameter of the conical cylinder is phi 729mm, the maximum diameter is phi 789mm, and the thickness is 1.0mm;
(3) Design of forming die
A viscous medium forming die is designed, as shown in fig. 5. The medium cylinder filled with viscous medium materials is placed in a cavity formed by two inner holes of a lower base plate 6 and a cushion block 7, a blank is placed between a core mold 3 and a female mold 4, the bottom surface of the small end of the blank is placed on the upper surface of the lower base plate 6, the upper surface of an upper base plate 2 is tightly pressed by an upper platform of a four-column hydraulic machine, the viscous medium in the medium cylinder is jacked up by utilizing the precise matching of a mandril of the four-column hydraulic machine and the medium cylinder, and the viscous medium in the medium cylinder is jacked into a flow channel of the core mold 3 through the sealing and jacking functions of a plug 1, so that the pressure of the viscous medium is transmitted to the blank, the blank is expanded to the molded surface of the female mold 4 by utilizing the viscous medium, the forming of parts is realized, and the quantity of the viscous medium required in the forming process is greatly reduced through the structural design of the flow channel of the core mold 3; further, in the molding process, in consideration of sealing against the viscous medium, a groove for a seal ring is provided in the core mold 3 as shown in fig. 6, and sealing is performed by a seal ring of a YX type cross section.
Step three: mounting die
(1) The medium cylinder is arranged on a lower platform of the four-column hydraulic press, the position of the medium cylinder body corresponds to that of the ejector rod, so that the ejector rod can move up and down along the cylinder body, and the outer diameter of the ejector rod is precisely matched with the inner diameter of the cylinder body to play a role in sealing viscous media;
(2) Mounting a forming die on a lower platform of a four-column hydraulic press, wherein a medium cylinder body is positioned in inner holes of a lower base plate and a cushion block, and the upper end face of the cylinder body is ensured to be precisely attached to the lower end face of a core die;
(3) Placing the titanium alloy conical barrel blank into the upper end surface of the lower backing plate along the molded surface of the 4-concave die;
(4) Placing the core mold with the sealing ring on the upper end surface of the lower backing plate;
(5) The plug is placed in the center of the lower end face of the upper base plate and is fixedly connected with the upper base plate through 2M 18 bolts, and the upper base plate is placed above the mold and is fixedly connected with the core mold through 6M 18 hexagon socket head cap bolts.
Step four: shaping process
(1) Starting an upper platform of the four-column hydraulic press, and providing a mold closing force by an equipment main slide block, wherein the mold closing force is 820 tons;
(2) Starting the equipment ejection cylinder to apply viscous medium pressure, wherein the pressure of the viscous medium is 90MPa; when the pressure of the viscous medium reaches 90MPa, unloading the pressure of the viscous medium; meanwhile, the main slide block moves upwards, and the core mold is taken out through the backing plate;
(3) Checking the blank die-attaching degree through an R gauge, and taking out the test piece when the minimum fillet radius of the test piece reaches R3; if the relevant size is not reached, repeating the above actions and increasing the pressure of the viscous medium appropriately;
step five: three-coordinate measurement
Measuring the size of the stator inner ring by using a three-coordinate measuring machine;
step six: turning process
And machining the upper and lower rabbets of the formed stator inner ring to final sizes by using a lathe.
Claims (2)
1. A cold forming method for a flexible medium of a large-diameter titanium alloy inner U-shaped inner ring is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: design of forming scheme
Combining the size and the shape of the part, and providing a titanium alloy TA1 conical cylinder according to the forming principle and the characteristics of a viscous medium;
step two: design of process flow
A processing process flow of viscous medium cold forming is provided by combining a titanium alloy inner U-shaped inner ring structure:
(1) Blank preparation
(1) Processing a TA1 plate with the thickness of 1mm into two fan-shaped blocks by using a laser cutting machine;
(2) adopting a roll bending machine to divide the two fan-shaped blocks into two semi-conical cylinders;
(3) welding two semi-conical cylinders into a conical cylinder by adopting an automatic argon arc welding machine;
(4) polishing the welding line to be level with the base body;
(5) annealing treatment is carried out by adopting a vacuum heat treatment furnace;
(2) Blank design
Combining the part structure, and designing the structure and the size of a blank for forming;
(3) Design of forming die
Designing a viscous medium forming die;
step three: mounting die
(1) The medium cylinder is arranged on a lower platform of the four-column hydraulic press, the position of the medium cylinder body corresponds to that of the ejector rod, so that the ejector rod can move up and down along the cylinder body, and the outer diameter of the ejector rod is precisely matched with the inner diameter of the cylinder body to play a role in sealing viscous media;
(2) Placing the viscous medium into a medium cylinder and filling;
(3) Mounting a forming die on a lower platform of a four-column hydraulic press, wherein a medium cylinder body is positioned in inner holes of a lower base plate and a cushion block, and the upper end face of the cylinder body is ensured to be precisely attached to the lower end face of a core die;
(4) Placing the titanium alloy conical barrel blank into the upper end surface of the lower backing plate along the molded surface of the 4-concave die;
(5) Placing the core mold with the sealing ring on the upper end surface of the lower backing plate;
(6) The plug is placed in the center of the lower end face of the upper base plate and is fixedly connected with the upper base plate through 2M 18 bolts, and the upper base plate is placed above the mold and is fixedly connected with the core mold through 6M 18 hexagon socket head cap bolts.
Step four: shaping process
(1) Starting an upper platform of the four-column hydraulic press, and providing a mold closing force by an equipment main slide block, wherein the mold closing force is 820 tons;
(2) Starting a device ejecting cylinder to apply viscous medium pressure, wherein the pressure of the viscous medium is 90MPa; when the pressure of the viscous medium reaches 90MPa, unloading the pressure of the viscous medium; meanwhile, the main slide block moves upwards, and the core mold is taken out through the backing plate;
(3) Checking the blank die-attaching degree through an R gauge, and taking out the test piece when the minimum fillet radius of the test piece reaches R3; if the relevant size is not reached, repeating the above actions and increasing the pressure of the viscous medium appropriately;
step five: three-coordinate measurement
Measuring the size of the stator inner ring by using a three-coordinate measuring machine;
step six: turning process
And machining the upper and lower rabbets of the formed stator inner ring to final sizes by adopting a lathe.
2. The cold forming method for the flexible medium of the large-diameter titanium alloy inner U-shaped inner ring according to claim 1, wherein the cold forming method comprises the following steps: in the second step (3), the viscous medium forming die comprises a plug, an upper base plate, a core die, a concave die, a jacket, a lower base plate and a cushion block;
the cushion block is arranged at the lower end of the lower backing plate, the size of the inner hole of the cushion block is consistent with that of the inner hole of the lower backing plate, and the cushion block and the inner hole of the lower backing plate are arranged in an up-and-down alignment manner to form a cavity;
the outer sleeve is sleeved on the outer side of the female die and arranged on the lower base plate;
an upper platform of the four-column hydraulic machine is tightly pressed on the upper surface of the upper base plate;
a concave platform is arranged in the center of the core mold, and a flow passage structure arranged in the core mold is communicated with the concave platform;
the core mold is connected to the lower surface of the upper base plate, and the concave table is clamped in the center of the upper base plate;
the plug is installed in a groove reserved in the lower surface of the upper base plate and the core mold through a screw, and the plug is matched with the core mold flow passage;
a groove is arranged in the core mold;
the groove is sealed by a YX-shaped section sealing ring;
the medium cylinder is arranged in the cavity, the viscous medium in the medium cylinder is jacked up through the jacking and sealing of the plug, the viscous medium in the medium cylinder is jacked into the flow channel of the core mold, the pressure of the viscous medium is further transmitted to the blank, the blank is expanded to the molded surface of the female mold through the viscous medium, and therefore the forming of parts is achieved.
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| CN202211355264.XA CN115647181A (en) | 2022-11-01 | 2022-11-01 | Cold forming method for flexible medium of large-diameter titanium alloy inner U-shaped inner ring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116727476A (en) * | 2023-08-15 | 2023-09-12 | 中北大学 | Radial synchronous loading forming method for magnesium alloy tail wing |
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- 2022-11-01 CN CN202211355264.XA patent/CN115647181A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116727476A (en) * | 2023-08-15 | 2023-09-12 | 中北大学 | Radial synchronous loading forming method for magnesium alloy tail wing |
| CN116727476B (en) * | 2023-08-15 | 2023-11-07 | 中北大学 | Radial synchronous loading forming method for magnesium alloy tail wing |
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