CN113070406B - Flexible die applied to creep age forming and creep age forming method - Google Patents
Flexible die applied to creep age forming and creep age forming method Download PDFInfo
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- CN113070406B CN113070406B CN202110524871.3A CN202110524871A CN113070406B CN 113070406 B CN113070406 B CN 113070406B CN 202110524871 A CN202110524871 A CN 202110524871A CN 113070406 B CN113070406 B CN 113070406B
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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
- B21D37/10—Die sets; Pillar guides
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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
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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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
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Abstract
The invention discloses a flexible die applied to creep age forming, which comprises a blank holder strip, unit bodies, side walls, a fixing plate, hydraulic cylinders, a base, a bracket, a hydraulic control system and hydraulic oil connecting pipes, wherein the bracket and a plurality of hydraulic cylinders distributed in a dot matrix form are arranged on the base; the upper surface of the spherical end is a spherical curved surface, and the top of the surface of the spherical end forms a mold profile; the hydraulic control system adjusts the change of the mold surface by controlling the lifting of a piston in a hydraulic cylinder. The invention also provides a creep age forming method based on the flexible die. The invention solves the problem that the molding surface and even the mould are frequently replaced when the components with different curvatures are formed.
Description
Technical Field
The invention belongs to the technical field of creep age forming of aluminum alloy components, and particularly relates to a flexible die applied to creep age forming and a creep age forming method.
Background
The Creep Age Forming (CAF) technology is a novel metal plate Forming method developed for realizing the high-performance and precise Forming collaborative manufacturing of large-scale integral wallboard components, and has high Forming precision. The design of the existing creep aging forming die is more complicated: after the die profile is determined, since the rebound amount of the unloaded member is large, the rebound amount needs to be predicted and compensated to the die profile to obtain the desired target member shape. The prediction of the springback amount and the compensation optimization of the molded surface of the forming tool are always the key problems of the creep age forming technology. On the basis of such complicated and time-consuming mold design, in the face of different curvature members or due to the change of resilience caused by temperature or materials, the molded surface or even the mold needs to be frequently replaced, so that the mold is low in applicability, high in cost and low in production efficiency.
Patent document CN201911157801.8 discloses a creep age forming method based on mechanical loading, which comprises the following steps: firstly, a plate to be formed is placed on a mould; secondly, firstly, applying load to the upper surface of the plate to be formed through a main hydraulic cylinder and a loading hydraulic cylinder to deform the plate to be formed until the lower surface of the plate to be formed is tightly attached to the upper surface of a mould-shaped plate, and then fixing the part to be formed and the mould profile through a cover plate; thirdly, placing the workpiece to be formed and the die into an autoclave, heating to the aging temperature and preserving heat; and fourthly, cooling to room temperature, and unloading to obtain a creep age-formed product. However, the method has the defects that manual adjustment is needed, the labor cost is increased, and the adjustment precision is not easy to guarantee; in addition, the molding surface of the composite material belongs to block adjustment, and is not suitable for molding large double-curvature components; in order to make the component tightly fit with the molded surface, the loading device is adjusted by a hydraulic cylinder, so that the device is complex and the cost is increased.
Therefore, it is necessary to design a new mold for creep age forming.
Disclosure of Invention
The invention aims to provide a flexible die applied to creep age forming, which solves the problems of low die applicability, high cost and low production efficiency caused by the fact that the conventional creep age forming die provided in the background art needs to frequently replace a molded surface and even a die due to the fact that the conventional creep age forming die faces different curvature members or the resilience amount changes caused by temperature or materials.
In order to achieve the aim, the invention provides a flexible die applied to creep age forming, which comprises a blank holder strip, a unit body, side walls, a fixed plate, a hydraulic cylinder, a base, a bracket, a hydraulic control system and a hydraulic oil connecting pipe,
the bracket and the hydraulic cylinders distributed in a dot matrix form are arranged on the base, the bracket is arranged on the periphery of the hydraulic cylinders, four side walls are enclosed into a rectangle and are vertically arranged on the bracket, the fixing plate is horizontally arranged on the bracket, a through hole corresponding to the position of the hydraulic cylinder is formed in the fixing plate, the unit body comprises a unit body main body and a spherical end, the unit body main body penetrates through the through hole formed in the fixing plate in a matching manner, the lower end of the unit body main body is connected with a piston of the hydraulic cylinder, and blank pressing strips are arranged on the four side walls and are used for fixing the component; the upper part of the unit body main body is detachably connected with the spherical end, the upper surface of the spherical end is a spherical curved surface, and the top of the surface of the spherical end distributed in a dot matrix form forms a mold surface contacted with a member; the hydraulic control system positioned outside the autoclave controls the lifting of a piston in a hydraulic cylinder in the autoclave through a hydraulic oil connecting pipe penetrating through the autoclave so as to adjust the change of the mold surface formed by the surface of the spherical end.
In a specific embodiment, the lower end of the unit body is detachably connected with a piston of a hydraulic cylinder; the lower extreme of pneumatic cylinder can be dismantled and set up on the base, and both sides are provided with the flange about the pneumatic cylinder, and all are equipped with the oil through hole on the flange of upper and lower both sides, are connected with different hydraulic oil takeover respectively.
In a specific embodiment, the flexible die applied to creep age forming further comprises a displacement sensor, wherein the displacement sensor is used for sensing the displacement distance of the unit body and transmitting the sensing data to the hydraulic control system through a lead.
In a specific embodiment, the edge pressing strip is L-shaped, one edge is pressed on the component, and the other edge is arranged on the side surface of the side wall; the four blank pressing strips are respectively arranged at the right angles of the rectangle surrounded by the four side walls.
In a specific embodiment, an internal threaded hole is formed above the unit body, an external threaded rod matched with the internal threaded hole is arranged below the spherical end head, and the upper part of the unit body is connected with the spherical end head through threads; the four side walls comprise two long side walls and two short side walls which are symmetrically arranged, and the bottoms of the four side walls are connected with the four edges of the fixing plate; the hydraulic cylinder is arranged on the base through a bolt.
In a specific embodiment, the diameter of the spherical end is 90-126 mm, and the distance between two adjacent unit bodies is 250-350 mm.
In a specific embodiment, each hydraulic cylinder is provided with a separate hydraulic circuit for realizing independent control.
In a specific embodiment, the hydraulic control system comprises a fixed-displacement hydraulic pump and a variable-displacement hydraulic pump, and the variable-displacement hydraulic pump is adjusted according to the overflow loss to reduce the overflow loss generated when the flow is reduced.
The invention also provides a creep aging forming method based on the flexible die, which adopts any one of the flexible die applied to creep aging forming; the method comprises the following specific steps:
firstly simulating the deformation process of the component, inputting relevant data of a component deformation curve in a hydraulic control system according to a simulation result, then controlling the uppermost ends of the surfaces of all spherical end heads and four side walls to be in the same horizontal plane, then placing the component to be processed on a mould profile formed by all the spherical end heads, fixing the component on the mould profile through a blank holder strip, then installing an air-permeable felt, a sealing glue and a vacuum bag, placing the component into a hot-pressing tank after the component is installed, and connecting a hydraulic cylinder with a hydraulic oil connecting pipe; after the autoclave is started to load, the unit bodies are controlled to lift along with the deformation of the component, and the movement process of the unit bodies and the deformation of the component keep synchronous interlocking control, so that the flexible adjustment of the molded surface of the mold is realized.
In one specific embodiment, the hydraulic control circuit flow adjustment method is as follows:
A. hydraulic oil is pumped by the double pumps and flows to the four-way reversing valve under the action of the one-way valve, the four-way reversing valve receives a flow curve signal input by a computer, a valve channel is adjusted under the action of the internal electromagnet, the flow direction is changed, and the unit body is changed in ascending and descending; when the lifting mechanism is lifted, the hydraulic cylinder enters and exits from the bottom, and when the lifting mechanism is lowered, the hydraulic cylinder enters and exits from the top;
B. hydraulic oil flows to the hydraulic cylinder through the four-way valve, flows into the hydraulic cylinder through the one-way valve and flows out of the regulating valve on the way, the opening degree of the outlet regulating valve is controlled to regulate the outlet flow of the hydraulic cylinder, so that the lifting speed of the unit body is controlled, after the displacement of the measured unit body reaches the final required position, the outlet regulating valve is closed, a loop enters a pressure maintaining state, and the unit body is static;
C. the opening of the regulating valve realizes independent negative feedback regulation among all branches according to the flow curve of the input control end and the measured value of a flow sensor arranged at the outlet of the throttle valve, and the opening of the regulating valve is continuously regulated to obtain the required outlet flow so as to correspond to the required speed of the movement of the unit body;
D. in order to reduce frequent fluctuation of the control valve, a valve opening control part of the hydraulic control system adopts PI control, and control gain is small, so that the control gain is close to pure integral control, namely, integral time is small enough.
Compared with the prior art, the invention has the following beneficial effects:
the flexible die applied to creep age forming solves the problem that the molded surface and even the die need to be frequently replaced when different curvature members are formed.
The flexible die applied to creep age forming can self-compensate the springback amount by changing the displacement of the unit bodies, adapt to the influence of the change of temperature or materials on the springback amount and improve the forming precision.
The flexible die applied to creep age forming is a dot-matrix flexible die, is conveniently used for forming large-scale double-curvature components, the molded surface of the die is flexible and adjustable, and the unit bodies are hydraulically driven and form linkage with the component deformation process.
The die profile can be subjected to height adjustment according to a forming simulation result by controlling the unit bodies in the forming process, can adapt to the change of the rebound quantity, and can adjust and compensate the rebound quantity in time within a certain range; meanwhile, the method is suitable for forming components with different curvatures, and the application range of the die is expanded. The ascending and descending of the unit body of the invention are simple compared with mechanical transmission through hydraulic transmission, thereby avoiding the overload condition of the machine. In the creep aging forming process, the forming component and the molded surface of the die are always attached, so that the possible instability of the component in the past creep aging forming due to suspension loading is avoided.
According to the simulation result, the hydraulic control system has an independent loop for realizing independent control on each unit body, and is convenient to adjust.
The hydraulic circuit of the invention adopts double-pump drive and is divided into a fixed displacement pump and a variable displacement pump, wherein the variable displacement pump is adjusted according to the size of overflow loss, so that the overflow loss generated in the process of low flow is reduced.
The opening of the flow regulating valve realizes independent negative feedback regulation according to input data and a flow sensor measuring value, and a control system adopts proportional-integral control, so that the control function can eliminate residual difference in time. The control between each unit body is relatively independent, and in actual operation, the replacement and maintenance can be carried out quickly and conveniently.
The vacuum bag is combined with the real-time adjusting unit body for pressurization, so that a complex manual process that a plurality of loading bolts are screwed on the upper part to ensure the fit of the molded surface is omitted; meanwhile, the profile curvature is automatically adjusted hydraulically, a forming plate does not need to be replaced, and the precision is higher.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is a schematic half-section view of one embodiment of the present invention;
FIG. 3 is a schematic structural view of an unmounted component and a binder strip according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a hydraulic control system according to one embodiment of the present invention.
Wherein, 1, a blank holder strip; 2. a side wall; 3. a bracket; 4. a hydraulic cylinder; 5. a hydraulic oil connecting pipe; 6. a base; 7. a fixing plate; 8. a unit body; 9. a component.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1
The invention relates to a flexible die applied to creep age forming, which comprises a blank holder strip 1, a unit body 8, a side wall 2, a fixed plate 7, a hydraulic cylinder 4, a base 6, a bracket 3, a hydraulic control system and a hydraulic oil connecting pipe 5,
the bracket 3 and the hydraulic cylinders 4 distributed in a dot matrix form are all arranged on the base 6, the bracket 3 is arranged on the periphery of the hydraulic cylinders 4, the four side walls 2 are enclosed into a rectangle and are erected on the bracket 3, the fixing plate 7 is horizontally arranged on the bracket 3, through holes corresponding to the positions of the hydraulic cylinders 4 are formed in the fixing plate 7, each unit body 8 comprises a unit body main body and a spherical end, the unit body main bodies penetrate through the through holes formed in the fixing plate 7 in a matching mode, the lower end of each unit body main body is connected with a piston of each hydraulic cylinder 4, and the blank pressing strips 1 are arranged on the four side walls 2 and used for fixing the component 9; the upper part of the unit body main body is detachably connected with the spherical end, the upper surface of the spherical end is a spherical curved surface, and the top of the surface of the spherical end distributed in a dot matrix form forms a mold surface contacted with a member;
the hydraulic control system positioned outside the autoclave controls the lifting of a piston in a hydraulic cylinder 4 in the autoclave through a hydraulic oil connecting pipe 5 penetrating through the autoclave so as to adjust the change of the mold surface formed by the surface of the spherical end.
The upper surface of the spherical end is in spherical curved surface and is in smooth contact with the component, so that the surface smoothness of the component is not influenced by the molded surface of the mold. The bracket 3 is bent to be in a hand shape, supports the side wall and the fixed plate 7, and provides space for the hydraulic cylinder 4 and the hydraulic oil connecting pipe 5 below the fixed plate 7. The through holes arranged on the hydraulic cylinder 4, the unit bodies 8 and the fixing plate 7 are uniformly distributed in the horizontal plane with the quantity of M multiplied by N in the longitudinal and transverse directions. The longitudinal and transverse uniformity in the horizontal plane of 9 × 9 is preferable. The movement speed of the unit body 8 is adjusted by controlling the flow of the hydraulic oil channel of the hydraulic oil connecting pipe 5, and the interlocking control of the movement of the unit body 8 and the deformation of the component is realized. The hydraulic oil connecting pipe 5 is connected with a flow regulating valve, and flow regulation is realized through the opening of the regulating valve, so that the speed of each unit body is independently controlled. The through holes arranged on the fixed plate 7 have a certain positioning function on the movement of the unit bodies 8.
The lower end of the unit body main body is detachably connected with a piston of the hydraulic cylinder 4; the lower extreme of pneumatic cylinder 4 can be dismantled and set up on base 6, and both sides are provided with the flange about pneumatic cylinder 4, and all are equipped with the oil through hole on the flange of upper and lower both sides, are connected with different hydraulic oil takeover 5 respectively. The lower end of the unit body main body is arranged into a step shape and is sleeved and fixed with a piston of the hydraulic cylinder 4 through a bolt group.
The flexible die applied to creep aging forming further comprises a displacement sensor, and the displacement sensor is used for sensing the displacement distance of the unit body 8 and transmitting sensing data to a hydraulic control system through a lead.
The edge pressing strip 1 is L-shaped, one edge is pressed on the component 9, and the other edge is arranged on the side surface of the side wall 2; the four blank pressing strips 1 are respectively arranged at the right angle of the rectangle formed by the four side walls 2. The blank holder strip 1 is L-shaped and is arranged around the upper part of the component to position the component, so that the component is prevented from moving in the forming process.
An internal threaded hole is formed above the unit body, an external threaded rod matched with the internal threaded hole is arranged below the spherical end head, and the upper part of the unit body is connected with the spherical end head through threads; the four side walls 2 comprise two long side walls and two short side walls which are symmetrically arranged, and the bottoms of the four side walls 2 are connected with the four sides of the fixing plate 7; the hydraulic cylinder 4 is arranged on the base 6 through bolts. The four side walls 2 and the fixed plate 7 are connected with each other to form a square space.
The diameter of the spherical end is 90-126 mm, and the distance between two adjacent unit bodies 8 is 250-350 mm.
Each hydraulic cylinder 4 is provided with an independent hydraulic circuit to realize independent control.
The hydraulic control system comprises a quantitative hydraulic pump and a variable hydraulic pump, wherein the variable hydraulic pump is adjusted according to the overflow loss, and the overflow loss generated when the flow is reduced. The variable displacement hydraulic pump assists in a movement with a large acceleration at the initial stage of forming. The moving speed of the unit body 8 in the initial stage of creep age forming is high, the flow required by the system is high, the flow in the later stage becomes very low, the overflow quantity of the variable hydraulic pump is measured according to the flow sensor 3 in the low-speed stage in the later stage, and the variable hydraulic pump is adjusted after exceeding a certain value, so that the overflow loss is reduced, and the energy-saving effect is realized.
The invention also provides a creep aging forming method based on the flexible die, which adopts any one of the flexible die applied to creep aging forming; the method comprises the following specific steps:
firstly simulating the deformation process of a component, inputting relevant data of a component deformation curve in a hydraulic control system according to a simulation result, then controlling the uppermost ends of the surfaces of all spherical end heads and four side walls 2 to be in the same horizontal plane, then placing the component to be processed on a mould profile formed by all the spherical end heads, fixing the component on the mould profile through a blank holder 1, then installing an air-permeable felt, a sealing glue and a vacuum bag, placing the component into a hot-pressing tank after the component is installed, and connecting a hydraulic cylinder 4 with a hydraulic oil connecting pipe 5; after the autoclave is started to load, the unit bodies are controlled to lift along with the deformation of the component, and the movement process of the unit bodies and the deformation of the component keep synchronous interlocking control, so that the flexible adjustment of the molded surface of the mold is realized.
The component is placed above the molded surface of the die in the creep age forming process, the blank holder strip is placed above the component and used for fixing the component, and the surfaces of the spherical ends above all the unit bodies are in contact with the component to play a supporting role.
After the vacuum bag is sealed, the vacuum bag enters an autoclave to be loaded, the component begins to deform, and in the process, the unit body moves in accordance with the deformation of the component according to the simulation deformation result of the component. In the process, the surface of the spherical end above the unit body is always contacted with the member, so that the problem of forming defects caused by suspended loading of the member is avoided; the problem of vacuum bag retraction does not occur. The movement of the unit bodies is controlled by a hydraulic cylinder at the lower part, and the molded surface of the die can be adjusted at any time. And finally, after the required deformation is achieved, the hydraulic circuit enters a pressure maintaining state, the unit body is static, and after creep aging forming is finished, the component is unloaded and rebounds to obtain the required molded surface.
The flow regulating method of the hydraulic control loop comprises the following steps:
A. hydraulic oil is pumped by the double pumps and flows to the four-way reversing valve under the action of the one-way valve, the four-way reversing valve receives a flow curve signal input by a computer, a valve channel is adjusted under the action of the internal electromagnet, the flow direction is changed, and the unit body is changed in ascending and descending; when the lifting mechanism is lifted, the hydraulic cylinder enters and exits from the bottom, and when the lifting mechanism is lowered, the hydraulic cylinder enters and exits from the top;
B. hydraulic oil flows to the hydraulic cylinder through the four-way valve, flows into the hydraulic cylinder through the one-way valve and flows out of the regulating valve on the way, and the opening degree of the outlet regulating valve is controlled to regulate the outlet flow of the hydraulic cylinder, so that the lifting speed of a piston, namely the unit body, is controlled, when the displacement of the measured unit body reaches the final required position, the outlet regulating valve is closed, a loop enters a pressure maintaining state, and the unit body is static;
C. the opening of the regulating valve realizes independent negative feedback regulation among all branches according to the flow curve of the input control end and the measured value of the flow sensor arranged at the outlet of the throttle valve, and the opening of the regulating valve is continuously regulated to obtain the required outlet flow (corresponding to the movement speed of the unit body).
D. In order to reduce the frequent fluctuation of the control valve, the valve opening control part of the hydraulic control system adopts PI control, and the control gain is small, so that the control gain is close to pure integral control, namely the integral time is small enough.
In fig. 4, the difference between the left branch and the right branch is that the unit body connected with the left branch rises in the forming process, so that the rising speed and the falling speed need to be controlled, and the upper pipeline interface and the lower pipeline interface of the hydraulic cylinder are both connected with regulating valves; and only descending motion exists in the forming process of the unit body connected with the right branch, so that only the lower pipeline interface of the hydraulic cylinder is connected with the regulating valve.
According to the invention, the die molded surface is adjusted by adopting the dot-matrix hydraulic unit, on one hand, the forming problem of a large double-curvature member is solved on the basis of the die molded surface, and the contact points of the unit body and the member are independently controlled, so that the forming precision is higher; on the other hand, the hydraulic cylinder is applied to the adjustment of the mold surface without adjusting the mold surface in advance, the lifting of the unit bodies and the deformation of the member are kept under real-time and interlocking control, the condition that the lower part of the member is tightly attached to the mold surface all the time is ensured, the problem of internal defects caused by unstable loading is solved under the condition that a loading device is not used, and the problem of vacuum bag shrinkage is avoided. The method can timely and conveniently carry out self-compensation on the resilience amount within a certain range, does not need repeated die repair, and adapts to the influence of the change of temperature or materials on the resilience amount; the molded surface and the die do not need to be replaced when facing components with different curvatures, the electromechanical liquid integration is realized, the labor cost is greatly reduced, and the forming period is shortened.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A flexible mold applied to creep aging forming is characterized by comprising a blank holder strip (1), unit bodies (8), side walls (2), a fixing plate (7), a hydraulic cylinder (4), a base (6), a bracket (3), a hydraulic control system and a hydraulic oil connecting pipe (5),
the bracket (3) and the hydraulic cylinders (4) distributed in a dot matrix manner are all arranged on the base (6), the bracket (3) is arranged on the periphery of the hydraulic cylinders (4), the four side walls (2) are enclosed into a rectangle and erected on the bracket (3), the fixing plate (7) is horizontally arranged on the bracket (3), through holes corresponding to the positions of the hydraulic cylinders (4) are formed in the fixing plate (7), the unit body (8) comprises a unit body and spherical end heads, the unit body is matched with and penetrates through the through holes formed in the fixing plate (7), the lower end of the unit body is connected with a piston of the hydraulic cylinder (4), and the edge pressing strips (1) are arranged on the four side walls (2) and used for fixing the component (9); the upper part of the unit body main body is detachably connected with the spherical end, the upper surface of the spherical end is a spherical curved surface, and the top of the surface of the spherical end distributed in a dot matrix form forms a mold surface contacted with a member; the hydraulic control system positioned outside the autoclave controls the lifting of a piston in a hydraulic cylinder (4) in the autoclave through a hydraulic oil connecting pipe (5) penetrating through the autoclave so as to adjust the change of the mold surface formed by the top of the surface of the spherical end.
2. The flexible mold for creep age forming according to claim 1, wherein the lower end of the unit body is detachably connected with the piston of the hydraulic cylinder (4); the lower end of the hydraulic cylinder (4) is detachably arranged on the base (6), flanges are arranged on the upper side and the lower side of the hydraulic cylinder (4), oil through holes are formed in the flanges on the upper side and the lower side, and the oil through holes are respectively connected with different hydraulic oil connecting pipes (5).
3. The flexible mold for creep age forming according to claim 1, further comprising a displacement sensor for sensing the displacement distance of the unit body (8) and transmitting the sensed data to the hydraulic control system through a wire.
4. Flexible mould for creep-age forming application according to claim 1, characterised in that the edge strip (1) is L-shaped, one edge pressing on the component (9) and the other edge being arranged on the side of the side wall (2); the four edge pressing strips (1) are respectively arranged at the right angles of the rectangle surrounded by the four side walls (2).
5. The flexible mold for creep age forming according to claim 1, wherein an internal threaded hole is provided above the unit body, an external threaded rod matched with the internal threaded hole is provided below the spherical end head, and the unit body is connected with the spherical end head through a thread; the four side walls (2) comprise two long side walls and two short side walls which are symmetrically arranged, and the bottoms of the four side walls (2) are connected with the four sides of the fixing plate (7); the hydraulic cylinder (4) is arranged on the base (6) through a bolt.
6. The flexible mold for creep age forming according to claim 1, wherein the diameter of the spherical end is 90-126 mm, and the distance between two adjacent unit bodies (8) is 250-350 mm.
7. Flexible die for creep age forming according to claim 1, characterised in that each hydraulic cylinder (4) has a separate hydraulic circuit for independent control.
8. The flexible mold for creep age forming as claimed in claim 1, wherein the hydraulic control system comprises a fixed displacement hydraulic pump and a variable displacement hydraulic pump, the variable displacement hydraulic pump is adjusted according to the overflow loss, and the overflow loss generated when the flow is reduced.
9. A creep age forming method based on a flexible die is characterized in that the flexible die applied to creep age forming is adopted in the creep age forming method based on the flexible die, and the creep age forming method is as claimed in any one of claims 1 to 8; the method comprises the following specific steps:
firstly simulating the deformation process of the component (9), inputting relevant data of a deformation curve of the component (9) in a hydraulic control system according to a simulation result, then controlling the uppermost ends of the surfaces of all spherical end heads and the top surfaces of four side walls (2) to be in the same horizontal plane, then placing the component (9) to be processed on a mould profile formed by all the spherical end heads, fixing the component (9) on the mould profile through a blank holder (1), then installing a felt, a sealing glue and a vacuum bag, placing the component into an autoclave after-installation, and connecting a hydraulic cylinder with a hydraulic oil connecting pipe (5); after the autoclave is started to load, the control unit body (8) is lifted along with the deformation of the component (9), and the movement process of the unit body and the deformation of the component keep synchronous interlocking control, so that the flexible adjustment of the molded surface of the mold is realized.
10. The flexible mold based creep age forming method of claim 9 wherein the hydraulic control circuit flow regulation method is as follows:
A. hydraulic oil is pumped by the double pumps and flows to the four-way reversing valve under the action of the one-way valve, the four-way reversing valve receives a flow curve signal input by a computer, a valve channel is adjusted under the action of the internal electromagnet, the flow direction is changed, and the unit body is changed in ascending and descending; when the lifting mechanism is lifted, the hydraulic cylinder enters and exits from the bottom, and when the lifting mechanism is lowered, the hydraulic cylinder enters and exits from the top;
B. hydraulic oil flows to the hydraulic cylinder through the four-way reversing valve, flows into the hydraulic cylinder through the one-way valve and flows out of the hydraulic cylinder through the regulating valve on the way, the opening degree of the regulating valve at the outlet is controlled to regulate the flow of the outlet of the hydraulic cylinder, so that the lifting speed of the unit body is controlled, after the displacement of the measured unit body reaches the final required position, the regulating valve at the outlet is closed, a loop enters a pressure maintaining state, and the unit body is static;
C. the opening of the regulating valve realizes independent negative feedback regulation among all branches according to the flow curve of the input control end and the measured value of a flow sensor arranged at the outlet of the throttle valve, and the opening of the regulating valve is continuously regulated to obtain the required outlet flow so as to correspond to the required speed of the movement of the unit body;
D. in order to reduce frequent fluctuation of the control valve, a valve opening control part of the hydraulic control system adopts PI control, and control gain is small, so that the control gain is close to pure integral control, namely, integral time is small enough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110524871.3A CN113070406B (en) | 2021-05-14 | 2021-05-14 | Flexible die applied to creep age forming and creep age forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110524871.3A CN113070406B (en) | 2021-05-14 | 2021-05-14 | Flexible die applied to creep age forming and creep age forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113070406A CN113070406A (en) | 2021-07-06 |
| CN113070406B true CN113070406B (en) | 2022-04-29 |
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| JPH10166056A (en) * | 1997-11-07 | 1998-06-23 | Kawasaki Heavy Ind Ltd | Spring back predicting method for age forming |
| CN102266887A (en) * | 2011-07-12 | 2011-12-07 | 中南大学 | Forming plate type mechanical load creep age-forming device |
| CN107335718A (en) * | 2017-08-23 | 2017-11-10 | 西北工业大学 | A kind of autoclave integral panel creep age forming flexible frock |
| CN107952872A (en) * | 2017-12-08 | 2018-04-24 | 山东大学 | Progressive molding device and method is aided in based on the hydraulic pressure that adjustable flexibility supports more |
| CN110405053A (en) * | 2019-08-05 | 2019-11-05 | 南京工程学院 | A kind of progressive molding auxiliary device for heat treating and its hot-working method |
| CN110883171A (en) * | 2019-12-24 | 2020-03-17 | 陈尧 | Special die equipment for creep age forming of aluminum alloy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070261463A1 (en) * | 2006-05-11 | 2007-11-15 | Rti International Metals, Inc. | Method and apparatus for creep forming of and relieving stress in an elongated metal bar |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10166056A (en) * | 1997-11-07 | 1998-06-23 | Kawasaki Heavy Ind Ltd | Spring back predicting method for age forming |
| CN102266887A (en) * | 2011-07-12 | 2011-12-07 | 中南大学 | Forming plate type mechanical load creep age-forming device |
| CN107335718A (en) * | 2017-08-23 | 2017-11-10 | 西北工业大学 | A kind of autoclave integral panel creep age forming flexible frock |
| CN107952872A (en) * | 2017-12-08 | 2018-04-24 | 山东大学 | Progressive molding device and method is aided in based on the hydraulic pressure that adjustable flexibility supports more |
| CN110405053A (en) * | 2019-08-05 | 2019-11-05 | 南京工程学院 | A kind of progressive molding auxiliary device for heat treating and its hot-working method |
| CN110883171A (en) * | 2019-12-24 | 2020-03-17 | 陈尧 | Special die equipment for creep age forming of aluminum alloy |
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| CN113070406A (en) | 2021-07-06 |
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