CN108723162B - Method for forming tangential non-closed variable cross-section tubular part by fluid pressure induction - Google Patents
Method for forming tangential non-closed variable cross-section tubular part by fluid pressure induction Download PDFInfo
- Publication number
- CN108723162B CN108723162B CN201710569573.XA CN201710569573A CN108723162B CN 108723162 B CN108723162 B CN 108723162B CN 201710569573 A CN201710569573 A CN 201710569573A CN 108723162 B CN108723162 B CN 108723162B
- Authority
- CN
- China
- Prior art keywords
- push head
- tube blank
- forming
- fluid pressure
- blank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 69
- 239000012530 fluid Substances 0.000 title claims abstract description 53
- 230000006698 induction Effects 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 238000005452 bending Methods 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 229920006255 plastic film Polymers 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 230000001502 supplementing effect Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000006052 feed supplement Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/045—Closing or sealing means
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to a method for forming a tangential non-closed variable cross-section tubular part by fluid pressure induction, and provides a novel forming process method and an original blank state for the tangential non-closed tubular part with a variable cross-section complex structure in the field of aerospace. Firstly, aiming at tangential non-closed tubular parts, selecting a plate and then bending to form a tubular blank with lap margins, wherein a rubber sealing sleeve is arranged inside the tubular blank to realize sealing. Moving the push head at the characteristic part difficult to form to a position with a certain distance from the outer surface of the tube blank, and applying fluid pressure to realize local reverse material gathering; and then, the fluid pressure is continuously pressurized, the left and right side push heads continue to feed the supplementary material to the middle part along the axial direction, the side push head at the position of the characteristic difficult to form retreats and is always in contact with the blank, and the small-characteristic shaping and the final forming of the characteristic difficult to deform are realized. The forming method has the characteristics of wide material applicability range, high part forming precision, high part structure complexity, small equipment tonnage, few die tools, production cost saving and the like.
Description
Technical Field
The invention belongs to the technical field of internal high-pressure forming, and particularly relates to a method for forming a tangential non-closed variable-cross-section tubular part by fluid pressure induction.
Background
The light structure is one of the main means for saving fuel and reducing exhaust emission of vehicles such as automobiles, airplanes and the like. Structural functional members with special purposes usually adopt hollow variable cross-section components, so that the mass can be reduced and the strength of materials can be fully utilized. The internal high pressure forming is an advanced manufacturing technology which takes a pipe as a blank and forms the pipe into a required shape under the combined action of internal pressure and axial feed supplement. The inner high-pressure forming part replaces solid with hollow, equal section with variable section and welding section with closed section, and has 15-30% less mass than that of punching and welding part and greatly raised rigidity and fatigue strength. These have led to the widespread use of internal high pressure forming techniques for forming tubular parts having complex, varying cross-sections.
The essence of internal high-pressure forming is that the closed thin shell is changed into a shell with a complex shape from a cylindrical shell through various intermediate shape changes and plastic deformation under the action of internal pressure, and the plastic deformation in the internal high-pressure forming process is very complex because the contact sequence of the intermediate shape changes and a die is influenced by factors such as a loading path, friction and the like. Compared with the traditional stamping and welding process, the internal high-pressure forming process has the main advantages that: (1) the weight is reduced and the material is saved. The hollow shaft parts can be reduced by 40-50%, and some parts can reach 75%; (2) the number of parts and dies is reduced, and the die cost is reduced. The inner high-pressure forming part generally only needs one set of die, and most stamping parts need a plurality of sets of dies; (3) the subsequent machining and assembling welding amount can be reduced, and the production efficiency is improved; (4) strength and rigidity are improved; (5) the production cost is reduced.
The internal high-pressure forming pipe fittings are all welded whole pipes which are sealed tangentially, however, in the aerospace field, due to the requirements of special working environments, the appearance structures of some structural functional parts are complex, for example, the tubular parts are tangentially unclosed, have certain lap margins and have complex structures with variable cross sections. Because the tangential non-closure of the part causes the selection of the blank to be limited, the whole pipe is selected to be welded for internal high-pressure forming, and auxiliary processes such as cutting and the like are needed in the later period, thereby influencing the shape precision and the size precision of the formed part characteristics; the plate is selected, the position precision of each local feature and the shape precision of a final product are difficult to guarantee by utilizing the traditional punching and welding process, and a plurality of working procedures are needed for forming small features of each part by the punching process, so that the working procedures are complicated, the tonnage of equipment is large, and the production cost is high. The limitations of the conventional forming process also limit the design and development of aerospace structural members with more complex structures. Because the radial dimension of local characteristics on different sections is larger, the deformation is large, the forming difficulty is large, and the requirement on the radial flow of materials is uniform, the traditional internal high-pressure forming is utilized, and even though the axial material supplement is sufficient, the forming is difficult to be in place.
Disclosure of Invention
The invention aims to solve the problems and provides a method for forming a tangential non-closed variable cross-section tubular part by fluid pressure induction.
In order to achieve the above object, the present invention provides a method for fluid pressure-induced forming of a tangential non-closed variable cross-section tubular part, comprising the following steps in sequence:
1) the die cavities of the upper die and the lower die are cleaned, so that the die cavities are clean, and impurities such as fine particles in the die cavities are prevented from being embedded into the outer surface of the blank under the action of fluid pressure in the bulging process, and the surface quality of parts is seriously reduced. Meanwhile, the sheet is rolled into a cylinder shape, certain lap allowance is controlled, and the problem that parts cannot be formed or the forming size cannot meet the required requirements due to the fact that materials cannot be supplemented timely due to the fact that the materials flow in the circumferential direction in the bulging process is avoided.
2) The sealing rubber sleeve is placed into the tube blank, the outer diameter of the sealing rubber sleeve is consistent with the inner diameter of the tube blank, an assembly structure is formed, and the sealing rubber sleeve is prevented from being separated from the tube blank in the forming process and losing the sealing effect of the sealing rubber sleeve. Then the tube blank is placed into a lower die cavity, and an upper die moves downwards to be closed with a lower die. The left push head and the right push head are respectively connected with two side push oil cylinders, and the side push oil cylinders perform feed motion to drive the left push head and the right push head to respectively move towards the middle part along the axis of the tube blank. The push head is in interference fit with the combination of the tube blank and the rubber sealing sleeve, so that the connection and sealing between the push head and the tube blank are realized, and the separation of the push head and the tube blank in the bulging process is prevented, so that the experiment fails.
3) The upper push head and the lower push head are respectively connected with two side push oil cylinders, the side push oil cylinders drive the upper push head and the lower push head to move to a position which is away from the surface of the tube blank by a certain distance along a straight line through feeding motion, and the position is determined according to local reverse material gathering quantity of the part deformation-resistant characteristic.
4) The fluid medium flows into the tube blank through the oil through pipe in the right push head, and uniformly distributed internal pressure is applied to the inner surface of the tube blank through an optimized loading path. In the bulging process, the left pushing head and the right pushing head continue to move towards the middle part along the axis of the tube blank, so that the axial material feeding amount is increased, and the circumferential material deformation is supplemented. In order to fully realize local reverse material gathering at the characteristic part difficult to deform and ensure the subsequent requirement on the shape precision of parts, the fluid pressure cannot be too small; while preventing excessive pressure, excessive blank material flows into the gap between the mold and the upper and lower push heads to cause material accumulation and wrinkling, so that the final fluid medium pressure at this stage is determined to be P1。
5) In a fluidPressure P1Under the action, the small features on the pipe fitting are not deformed sufficiently, the film is not completely pasted, the fluid pressure needs to be increased, and the high-pressure shaping is realized. Meanwhile, the upper and lower push heads respectively realize backward movement, so that the characteristic of difficult forming is ensured to be fully formed. The left and right pushing heads continue to move towards the middle part, the axial feed of the tube blank is converted into circumferential feed supplement, and the transfer of different parts of the material is realized. In the stage, the loading path of the fluid medium needs to be reasonably matched with the retreating movement tracks of the upper and lower push heads, and the forming speed of the material at the part with the characteristic of difficult deformation is ensured to be moderate. Meanwhile, the upper and lower push heads need to be always in a state of being in contact with the tube blank in the retreating process, and the requirement on the shape precision of the characteristic of difficult deformation is ensured. Finally, the final fluid pressure at this stage reaches P2(P2＞P1) The effect of full deformation of the high-pressure shaping small characteristic and the local hard deformation characteristic is achieved.
6) And finally, relieving the pressure of the system, retreating the left and right push heads, retreating the upper and lower push heads, separating the upper and lower dies, taking out the parts, taking out the rubber sealing sleeve, cleaning the parts, and performing subsequent machining.
The invention provides a method for forming tangential non-closed variable cross-section tubular parts by fluid pressure induction, which takes a plate material as a raw material, and performs a fluid hydraulic bulging process after pipe coiling, and is essentially the combination of plate hydraulic forming and high-pressure forming in a pipe. The material selection range is wider for forming tangential closed tubular parts or non-closed tubular parts with lap margins, and the material selection range can be that a flat blank is directly rolled and bent into a tubular blank with lap margins, or the flat blank is rolled and bent and then welded into a tangential closed tube blank, or a tube blank finished product. The method utilizes a forming method of high pressure in the pipe fitting, overcomes the defects of large equipment tonnage, multiple processing procedures, complex die tooling and the like in the traditional process of combining stamping forming and bending, can realize the forming of complex parts through different stations in one set of die, saves the production cost and improves the working efficiency. Based on the size of the tube blank and the final size of deformation, theoretical analysis shows that the local deformation characteristic is difficult to form, the deformation far exceeds the maximum elongation of the material, the local reverse material gathering increases the material storage at the position of the deformation characteristic, the axial feeding of the material is converted into the circumferential filling of a mold cavity along with the movement of the left and right push heads in the bulging process, the material transfer at different positions is sequentially filled, and the possibility is provided for the production and trial production of variable-section tubular parts with more complex structures.
According to the method for forming the tangential non-closed variable-cross-section tubular part by fluid pressure induction, the final forming can be completed by using a set of die tooling, the multi-step positioning problem in the process of forming the tangential non-closed pipe fitting by combining traditional stamping forming with bending is reduced, the accumulation of shape errors caused by positioning of part characteristics is reduced, the positioning is performed once, and the requirement on the shape accuracy and the requirement on the size accuracy of a product are met. The rubber sealing sleeve is used for isolating the pipe fitting from high-pressure fluid, the assembly form of the rubber sealing sleeve and the pipe fitting is simple, the operation and the replacement are easy, and the production cost is reduced. The sectional shape and the motion trail of the side pushing head at the position difficult to deform are controlled, so that local difficult-to-form characteristics of different shapes and deformation amounts can be obtained, and the diversity of products with complex sectional characteristics is increased. The method has wide application prospect in the manufacturing of complex components in the fields of aerospace, automobiles, national defense industry and the like, particularly in the aspects of forming, shaping and the like of complex components with small characteristics and difficult deformation characteristics.
Drawings
FIG. 1 is a schematic diagram of the principle of the method for forming a tangential non-closed variable cross-section tubular part by fluid pressure induction provided by the invention.
FIG. 2 is a schematic diagram of a reverse material gathering stage of a local hard-forming feature by using the method for forming a tangential non-closed variable-cross-section tubular part by fluid pressure induction provided by the invention.
FIG. 3 is a schematic diagram of the process of high-pressure shaping small features and full bulging difficult-to-form features by using the method for forming tangential non-closed variable cross-section tubular parts by fluid pressure induction provided by the invention.
FIG. 4 shows a sheet blank of a tangential non-closed variable cross-section tubular part and the direction of pipe coiling.
Fig. 5 shows the shape of the tube blank placed in the mould cavity.
FIG. 6 is an axial view of a tangential non-closed variable cross-section tubular part.
In the figure: 1-rubber sealing sleeve, 2-left push head, 3-lower die, 4-lower push head, 5-non-sealing tube blank, 6-fluid medium, 7-oil through hole channel, 8-right push head, 9-upper die and 10-upper push head.
Detailed Description
The method for forming the tangential non-closed variable cross-section tubular part by fluid pressure induction provided by the invention is described in detail by combining the accompanying drawings and specific embodiments.
As shown in fig. 1-6, the present invention provides a method for fluid pressure-induced forming of a tangential non-closed variable cross-section tubular part, comprising the following steps in sequence:
1) and the cavities of the upper die 9 and the lower die 3 are cleaned, so that the cleaning of the cavities of the dies is ensured, and impurities such as fine particles in the cavities are prevented from being embedded into the outer surface of the blank under the action of fluid pressure in the bulging process, so that the surface quality of parts is seriously reduced. Meanwhile, the sheet 5 is rolled into a cylinder shape, certain lap allowance is controlled, and the problem that parts cannot be formed or the forming size cannot meet the required requirements due to the fact that materials cannot be supplemented timely due to the fact that the materials flow in the circumferential direction in the bulging process is solved.
2) The sealing rubber sleeve 1 is placed into the tube blank 5, the outer diameter of the sealing rubber sleeve 1 is consistent with the inner diameter of the tube blank 5, and a plastic film is wound outside the tube blank 5 in an auxiliary mode to form an assembly structure, so that the sealing rubber sleeve 1 is prevented from being separated from the tube blank in the forming process and losing the sealing effect of the sealing rubber sleeve 1. Then the tube blank 5 is placed into the cavity of the lower die 3, and the upper die 9 moves downwards to be closed with the lower die 3, so that the tube blank 5 is positioned in the closed die cavity. The left push head 2 and the right push head 8 are respectively connected with two side push oil cylinders, and the side push oil cylinders perform feed motion to drive the left push head and the right push head to respectively move towards the middle part along the axis of the tube blank 5. The head processing of left side pushing head 2 and right pushing head 8 has helicitic texture, and left side pushing head 2 and right pushing head 8 adopt interference fit with the assembly of pipe 5 and rubber seal sleeve 1, have realized being connected and sealed between pushing head and the pipe, prevent the separation from of bulging in-process pushing head and pipe, the experiment failure.
3) The upper push head 10 and the lower push head 4 are respectively connected with two side push oil cylinders, the side push oil cylinders drive the upper push head 10 and the lower push head 4 to move to a position which is a certain distance away from the surface of the tube blank 5 along a straight line through feeding motion, and the position is determined according to local reverse material gathering quantity of the part deformation-resistant characteristic.
4) The fluid medium 6 flows into the tube blank 5 through the oil through-channel 7 in the right push head 8, and applies a uniform internal pressure P to the inner surface of the tube blank 5 with an optimized loading path. The tube blank 5 moves along the circumferential direction under the fluid pressure P to fill the cavity, and the forming of the variable cross-section structure is realized. In the bulging process, the left push head 2 and the right push head 8 continue to move towards the middle part along the axis of the tube blank 5, so that the axial material feeding amount is increased, and the circumferential material deformation is supplemented. In order to fully realize local reverse material gathering at the characteristic part difficult to deform and ensure the subsequent requirement on the shape precision of parts, the fluid pressure cannot be too small; while preventing excessive pressure, excessive blank material flows into the gap between the mold and the push heads to cause material accumulation and wrinkling, so that the final fluid pressure at this stage is determined as P1。
5) At fluid pressure P1Under the action, the small features on the pipe fitting are not deformed sufficiently, the film is not completely pasted, the fluid pressure needs to be increased, and the high-pressure shaping is realized. Meanwhile, the upper push head 10 and the lower push head 4 respectively realize backward movement, and the characteristic of difficult forming is ensured to be fully formed. The left and right push heads continue to move towards the middle part, the axial feed of the tube blank 5 is converted into circumferential feed supplement, and the transfer of different parts of materials is realized. In this stage, the loading path of the fluid medium needs to be reasonably matched with the retreating movement tracks of the upper pushing head 10 and the lower pushing head 4, so that the material deformation speed at the part with the characteristic of difficult deformation is moderate, and the defects of overlarge bulging quantity, cracking, insufficient bulging quantity, uneven deformation and the like are prevented. Meanwhile, the upper push head 10 and the lower push head 4 need to be always in contact with the tube blank 5 in the process of retreating, the appearance precision requirement of the characteristic of difficult deformation is ensured, and finally the fluid pressure reaches P2(P2＞P1) The effect of full deformation of the high-pressure shaping small characteristic and the local hard deformation characteristic is achieved.
6) And finally, releasing the pressure of the system, retreating the left push head 2 and the right push head 8, retreating the upper push head 10 and the lower push head 4, separating the upper die and the lower die, taking out the part, taking out the rubber sealing sleeve 1, cleaning the part, and performing subsequent machining.
Claims (6)
1. A method for forming tangential non-closed variable cross-section tubular parts by fluid pressure induction, which is characterized by comprising the following steps: the method for forming the tangential non-closed variable cross-section tubular part by fluid pressure induction comprises the following steps in sequence:
1) cleaning the cavities of the upper die (9) and the lower die (3), ensuring the cleanness of the cavities of the dies, preventing impurities such as fine particles and the like in the cavities from being embedded into the outer surface of a blank under the action of fluid pressure in the bulging process, seriously reducing the surface quality of a part, simultaneously rolling the plate (5) into a cylinder shape, controlling certain scrap allowance, and preventing the part from being incapable of being formed or the forming size from meeting the required requirements due to the fact that materials cannot be supplemented in time because of the circumferential flowing of the materials in the bulging process;
2) the method comprises the steps of putting a sealed rubber sleeve (1) into a tube blank (5), keeping the outer diameter of the sealed rubber sleeve (1) consistent with the inner diameter of the tube blank (5), winding a plastic film outside the tube blank (5) in an auxiliary mode to form an assembly structure, preventing the tube blank (5) from being separated from the plastic film and losing the sealing effect of the sealed rubber sleeve (1) in the forming process, putting the tube blank (5) into a cavity of a lower die (3), enabling an upper die (9) to move downwards to be closed with the lower die (3) to enable the tube blank (5) to be located in the sealed die cavity, respectively connecting a left push head (2) and a right push head (8) with two side push cylinders, respectively, enabling the side push cylinders to move in a feeding mode to drive the left push head and the right push head to move towards the middle along the axis of the tube blank (5), processing the head portions of the left push head (2) and the right push head (8) to be provided with thread structures, and enabling a combination body of the tube blank (5, the connection and the sealing between the push head and the tube blank are realized, and the separation of the push head and the tube blank in the bulging process is prevented;
3) the upper push head (10) and the lower push head (4) are respectively connected with two side push oil cylinders, the side push oil cylinders drive the upper push head (10) and the lower push head (4) to move to a position which is a certain distance away from the surface of the tube blank (5) along a straight line through feeding movement, and the position is determined according to the local reverse material gathering amount of the part difficult deformation characteristic;
4) a fluid medium (6) flows into the tube blank (5) through an oil passage (7) in the right push head (8), an internal pressure P which is uniformly distributed is applied to the inner surface of the tube blank (5) through an optimized loading path, the tube blank (5) moves along the circumferential direction under the fluid pressure P to fill a cavity, the forming of a variable cross-section structure is realized, in the bulging process, the left push head (2) and the right push head (8) continue to move towards the middle part along the axis of the tube blank (5), the axial material feeding amount is increased, the circumferential material deformation is supplemented, in order to fully realize the local reverse material gathering at the characteristic of difficult deformation, the subsequent part appearance precision requirement is ensured, and the fluid pressure cannot be too small; while preventing excessive pressure, excessive blank material flows into the gap between the mold and the push heads to cause material accumulation and wrinkling, so that the final fluid pressure at this stage is determined as P1；
5) At fluid pressure P1Under the action, small characteristic deformation on the pipe fitting is insufficient, the pipe fitting is not completely attached with a die, fluid pressure needs to be increased to realize high-pressure shaping, the upper push head (10) and the lower push head (4) respectively realize backward movement to ensure that the characteristic difficult to form is fully formed, the left push head and the right push head continuously move towards the middle part to convert axial feeding of the pipe blank (5) into circumferential material supplementing to realize transfer of different parts of materials, in the stage, a loading path of a fluid medium needs to be reasonably matched with backward movement tracks of the upper push head (10) and the lower push head (4), the deformation speed of the materials at the characteristic difficult to deform is ensured to be moderate, the defects of overlarge bulging amount, cracking or insufficient bulging amount, uneven deformation and the like are prevented, meanwhile, the upper push head (10) and the lower push head (4) need to be always kept in a state of being in contact with the pipe blank (5) in the backward movement process, and the requirement on the, final fluid pressure reaches P2，P2＞P1The effect of full deformation of the high-pressure shaping small characteristic and the local hard deformation characteristic is realized;
6) and finally, releasing the pressure of the system, retreating the left push head (2) and the right push head (8), retreating the upper push head (10) and the lower push head (4), separating the upper die from the lower die, taking out the parts, taking out the rubber sealing sleeve (1), cleaning the parts, and performing subsequent machining.
2. The method of fluid pressure induced forming of a tangential non-closed variable cross section tubular part according to claim 1, characterized in that: the method utilizes the high-pressure fluid medium to form the tubular part with the deformed cross section and the complex structure, overcomes the defects of large tonnage of equipment, multiple processing procedures, complex die tooling and the like in the traditional process of combining stamping forming and bending forming of the part, can realize the forming of the complex part through different stations in one set of die, saves the production cost and improves the working efficiency.
3. The method of fluid pressure induced forming of a tangential non-closed variable cross section tubular part according to claim 1, characterized in that: based on the initial tangential dimension of the tube blank and the final dimensions of each deformed section, theoretical analysis shows that the local deformation difficult characteristic has the deformation far exceeding the maximum elongation of the material, the local reverse material gathering increases the material storage at the position of the deformation difficult characteristic, the process of filling the die cavity along the radial direction by the axial feeding of the material is realized along with the movement of the left pushing head and the right pushing head in the bulging process, different structural cavities are sequentially filled, and the possibility is provided for the production and trial production of variable-section tubular parts with more complex structures.
4. The method of fluid pressure induced forming of a tangential non-closed variable cross section tubular part according to claim 1, characterized in that: according to the method for forming the tangential non-closed variable-cross-section tubular part by fluid pressure induction, the final part can be formed by using a set of die tooling, the problem of multiple positioning in the process of forming the tangential non-closed tubular part by the traditional composite process of stamping forming and bending is solved, the accumulation of shape errors caused by positioning of functional characteristics and structural characteristics of the part is reduced, the part is positioned once, and the requirements on the appearance precision and the size precision of the product are met.
5. The method of fluid pressure induced forming of a tangential non-closed variable cross section tubular part according to claim 1, characterized in that: the rubber sealing sleeve is used for isolating the tube blank from a high-pressure fluid medium, the rubber sealing sleeve is placed into the rolled tube blank, the plastic film is used for wrapping the outer side of the tube blank so as to assemble the tube blank and the tube blank together, the fixation of the tube blank and the tube blank is realized, the assembly form of the rubber sealing sleeve and the tube blank is simple, the operation is easy, the price of the rubber sealing sleeve is low, the replacement is easy, and the production cost is reduced.
6. The method of fluid pressure induced forming of a tangential non-closed variable cross section tubular part according to claim 1, characterized in that: the sectional shape and the motion trail of the side pushing head at the position difficult to deform are controlled, so that local difficult-to-form characteristics of different shapes and deformation amounts can be obtained, and the diversity of products with complex sectional characteristics is increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710569573.XA CN108723162B (en) | 2017-07-13 | 2017-07-13 | Method for forming tangential non-closed variable cross-section tubular part by fluid pressure induction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710569573.XA CN108723162B (en) | 2017-07-13 | 2017-07-13 | Method for forming tangential non-closed variable cross-section tubular part by fluid pressure induction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108723162A CN108723162A (en) | 2018-11-02 |
| CN108723162B true CN108723162B (en) | 2021-01-19 |
Family
ID=63940314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710569573.XA Expired - Fee Related CN108723162B (en) | 2017-07-13 | 2017-07-13 | Method for forming tangential non-closed variable cross-section tubular part by fluid pressure induction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108723162B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109894508A (en) * | 2019-03-08 | 2019-06-18 | 苏州事达同泰汽车零部件有限公司 | The interior high-pressure molding technique of thin-wall pipe |
| CN110976608A (en) * | 2019-12-02 | 2020-04-10 | 隆昌山川精密焊管有限责任公司 | Pipe beam internal high-pressure forming method |
| CN111168407B (en) * | 2020-01-13 | 2021-06-22 | 大连理工大学 | Integrated manufacturing method of high-temperature-resistant thin-wall component by laying metal foil tape for blank making |
| CN111531014A (en) * | 2020-05-25 | 2020-08-14 | 广东思豪内高压科技有限公司 | Pulse type hydro-mechanical deep drawing device and method for complex curved surface thin-wall part |
| CN112756473B (en) * | 2020-12-17 | 2023-02-17 | 重庆虎溪电机工业有限责任公司 | Method for making copper thin-wall skeleton |
| CN113020391B (en) * | 2021-03-04 | 2022-05-03 | 北京航空航天大学 | Ultrahigh-pressure forming method and device for high-temperature alloy fluid medium |
| CN114309229B (en) * | 2021-12-27 | 2022-12-02 | 中国科学院金属研究所 | Forming-punching-flanging integrated impact hydraulic forming die and method |
| CN114700388B (en) * | 2022-04-28 | 2023-09-08 | 太原理工大学 | Forming method for thin-wall multi-way composite pipe fitting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212619A (en) * | 2013-04-10 | 2013-07-24 | 宁波帕沃尔精密液压机械有限公司 | Variable-mold-clamping-force pipe internal high-pressure forming device and method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921792B (en) * | 2012-11-28 | 2014-08-13 | 哈尔滨工业大学 | Composite inner and outer hydraulic pressure forming method for high-branch height thin-wall three-way pipe |
| CN105921588B (en) * | 2016-06-03 | 2018-10-19 | 广东工业大学 | A kind of unilateral feeding manifold inside high-pressure forming method and device |
| CN105921586B (en) * | 2016-06-03 | 2017-08-25 | 广东工业大学 | Swollen combined shaping method is rolled in a kind of double branch pipe upsetting side by side |
| CN105921587B (en) * | 2016-06-03 | 2017-06-27 | 广东工业大学 | A kind of forming and machining method of three branch pipes side by side |
| CN106216481B (en) * | 2016-09-14 | 2018-01-26 | 哈尔滨工业大学 | A kind of big section difference odd-shaped cross section pipe fitting swelling pressure combined shaping method |
| CN106424293B (en) * | 2016-11-29 | 2018-07-13 | 桂林电子科技大学 | A kind of hydraulic shock building mortion and manufacturing process for metal thin wall pipe |
| CN106734495B (en) * | 2016-12-28 | 2018-05-01 | 柳州智臻智能机械有限公司 | A kind of forming high pressure in pipe method of Varied clearance |
-
2017
- 2017-07-13 CN CN201710569573.XA patent/CN108723162B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212619A (en) * | 2013-04-10 | 2013-07-24 | 宁波帕沃尔精密液压机械有限公司 | Variable-mold-clamping-force pipe internal high-pressure forming device and method |
Non-Patent Citations (2)
| Title |
|---|
| 管材充液成形技术在国内航空制造领域中的应用;杨建军等;《航空制造技术》;20150630;第100-102，107页 * |
| 薄壁件液压成形新技术;苑世剑等;《航空制造技术》;20081231;第26-28页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108723162A (en) | 2018-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108723162B (en) | Method for forming tangential non-closed variable cross-section tubular part by fluid pressure induction | |
| CN101537447B (en) | Pipe liquid filled shear bending and forming method | |
| CN1193839C (en) | Superplastic forming process of titanium alloy corrugated pipe | |
| CN103341515B (en) | Extrusion forming mould for annular ribs of magnesium alloy shell parts | |
| CN102228926A (en) | Liquid-charging and forming method of two-way pressurizing pipe | |
| CN103111564B (en) | A kind of precision rolling manufacturing process of bimetallic cylindrical member | |
| CN102179439B (en) | Thick-wall pipe hydroforming device | |
| CN108580622B (en) | Design method of in-mold radial extrusion forming process of I-shaped longitudinal rib ring piece | |
| CN101274347A (en) | Method for processing pipe body, method for producing oil cylinder device and oil cylinder device | |
| CN104741875B (en) | A kind of processing technology of axle tube | |
| CN110560544B (en) | Large-section-difference hollow structural member axial compression expansion forging process method | |
| CN105312372A (en) | Car auxiliary frame and forming method | |
| CN105598248A (en) | Device for increasing pipe wall thickness through internal high pressure forming and process thereof | |
| CN102091746B (en) | Compound molding process of integral automobile body metal stamping part | |
| CN102921791B (en) | Section-variable hollow component forming device and method | |
| CN106670249A (en) | Extruding-expanding molding method for rim provided with flange | |
| CN203791437U (en) | Internal high pressure forming pipe end face seal plug | |
| CN103212619A (en) | Variable-mold-clamping-force pipe internal high-pressure forming device and method | |
| CN103042087B (en) | Process and device for molding small-bore hydraulic bellows | |
| CN103586299A (en) | High-alloy steel flexible wheel blank warm-extrusion technology used for harmonic wave decelerator | |
| CN106670296A (en) | Internal high-pressure forming die for forming pipe fitting of step structure and forming method thereof | |
| CN107803423A (en) | A kind of shaped structure and manufacturing process for manufacturing lightweight automobile rim | |
| CN102921847B (en) | A kind of precision rolling manufacturing process of cylindrical member and device | |
| CN206215732U (en) | A kind of internal high pressure forming mould for shaping hierarchic structure pipe fitting | |
| CN104624771B (en) | A kind of device of the forming limit improving metal tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210119 |