A liquid-filled part upset forming die

Abstract

The application discloses a kind of parts liquid upsetting forming die, the mould includes: outer mould assembly, blank, inner mould assembly and drive assembly, wherein, the outer mould assembly includes: first die and second die directly opposite, the center of the first die and the second die forms internal pressure cavity structure;The blank is placed in the internal pressure cavity structure;The inner mould assembly includes a pair of oppositely arranged side die and locking piece, the locking piece is arranged in the inner cavity of the blank, the side die can extrude the locking piece along the inner cavity, to make the internal shaping of the blank;The drive assembly is connected with the first die and the second die, to drive the first die and the second die to make the external shaping of the blank.The application can improve the accuracy of the part after correction and the service performance of the part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal hollow member shape correction, in particular to a part liquid-filled upsetting forming die. BACKGROUND

[0002] With the rapid development of aerospace, the demand for high-performance lightweight integral hollow members is increasing. However, the integral hollow member has complex characteristics of thin-walled special-shaped geometry, which leads to great manufacturing difficulty, complex process, and often causes serious machining deformation, making it difficult to ensure manufacturing precision. Therefore, a special shape correction process is usually arranged.

[0003] In engineering, the forming precision of the member is generally improved by process compensation and deformation correction. Process compensation is to apply a compensation amount to the die in the opposite direction of the springback deformation in advance, so that the shape of the workpiece after springback is exactly the same as the designed shape. However, compensation control method is mainly used in the case of fully understanding the material performance and simple workpiece. For new materials such as high-strength plates and aluminum alloy plates, or when the shape of the workpiece changes, the compensation data needs to be re-accumulated. For complex structural parts, the deformation in the forming process is irregular, so it is impossible to correct the forming shape by compensation to meet the requirement of improving the shape precision. Deformation correction refers to a process method that restores the size and shape of the deformed part or blank to the design precision requirement by external load or energy input without removing or adding materials. In actual industrial production, shape correction is an effective method to improve the forming precision of the member.

[0004] According to the working principle and the form of the applied load, the traditional correction method is mainly divided into mechanical correction, heating correction and cold correction. These correction methods inevitably introduce surface tensile stress when correcting the workpiece, which seriously affects the service performance of the workpiece. SUMMARY

[0005] The technical problem solved by the present application is to overcome the shortcomings of the prior art and provide a part liquid-filled upsetting forming die.

[0006] The technical solution of the present application is:

[0007] The present application provides a part liquid-filled upsetting forming die, the die comprises an outer die assembly, a blank, an inner die assembly and a driving assembly, wherein,

[0008] The outer die assembly comprises a first die and a second die facing each other, and the centers of the first die and the second die form an inner pressure cavity structure;

[0009] The blank is placed in the inner pressure cavity structure;

[0010] The inner mold assembly comprises a pair of oppositely arranged side molds and a locking member arranged in the inner cavity of the blank, and the side molds can extrude the locking member along the inner cavity to form the inside of the blank;

[0011] The driving assembly is connected with the first mold and the second mold to drive the first mold and the second mold to form the outside of the blank.

[0012] Optionally, the side mold comprises a mold plate,

[0013] The center of the mold plate is formed with a ring-shaped pressing plate, and the blank is in contact with the end face of the ring-shaped pressing plate;

[0014] The inner cavity of the ring-shaped pressing plate is provided with a gas cylinder, the fixed end of the gas cylinder is fixedly connected with the end face of the mold plate, the movable end of the gas cylinder is fixedly connected with a first pressing block, and the two sides of the first pressing block are provided with first grooves;

[0015] The first pressing block is movably connected with a group of second pressing blocks through the first grooves;

[0016] The second pressing block is arranged in the inner cavity region of the ring-shaped pressing plate, and the inner cavity region of the ring-shaped pressing plate is provided with a group of symmetrically arranged fourth pressing blocks corresponding to the positions of the second pressing blocks, and the second pressing block is installed in cooperation with the locking member;

[0017] The top surface and the bottom surface of the first pressing block are provided with a group of third pressing blocks, the third pressing blocks are arranged at the end face of the ring-shaped pressing plate, and the shapes of the third pressing blocks are adapted to the shapes of the first pressing block and the second pressing block.

[0018] Optionally, the locking member comprises an outer plate and a fifth pressing block, the number of the outer plate is two, and the two outer plates are arranged on the two sides of the fifth pressing block respectively;

[0019] The two ends of the outer plate are respectively formed with a plurality of insertion blocks, the insertion blocks are inserted into the insertion grooves arranged at the end face of the second pressing block, and there is a movable gap between the insertion blocks and the insertion grooves;

[0020] After the fifth pressing block is extruded and expanded, the outer plate moves along the movable gap to realize the internal forming of the blank.

[0021] Optionally, the third pressing block, the fourth pressing block and the fifth pressing block are all made of high molecular compound.

[0022] Optionally, the two sides of the first pressing block are inclined inclined surfaces;

[0023] The matching end faces of the second pressing block and the first block are adapted inclined inclined surfaces.

[0024] Optionally, when an inner groove is formed in the end face of the blank towards the inside, the end face of the annular pressing plate is formed with a fixing protrusion, and the position of the fixing protrusion corresponds to the position of the inner groove;

[0025] An injection hole is formed in the fixing protrusion and extends into the mold plate, and is connected with an injection machine to fill the inner cavity with high pressure liquid through the injection machine.

[0026] Optionally, the driving assembly comprises a pressing machine,

[0027] The pressing machine extrudes the upper mold and the lower mold through two corresponding upper and lower pads.

[0028] The two pads are respectively installed with the upper mold and the lower mold through threads.

[0029] Optionally, a fixing block is installed on the side mold to fixedly connect the side mold with the pad.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] The embodiment of the present application can solve the problem of part precision correction of double-layer hollow components, reduce the precision requirement of magnesium-aluminum alloy extruded parts, improve the complexity of extruded parts, and achieve the purpose of improving the precision of parts after correction and the service performance of parts. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A structure diagram of a part liquid-filled upset forming die is provided for the embodiment of the present application;

[0033] Figure 2 A side view diagram of a side mold is provided for the embodiment of the present application;

[0034] Figure 3 A diagram of a side mold and a locking part is provided for the embodiment of the present application;

[0035] Figure 4 A diagram of internal connection of a side mold and a locking part is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0036] Embodiment one

[0037] Referring to Figure 1 , a structure diagram of a part liquid-filled upset forming die is provided for the embodiment of the present application, as Figure 1 shown, the part liquid-filled upset forming die can include an outer mold assembly, a blank, an inner mold assembly and a driving assembly, wherein,

[0038] The outer mold assembly comprises a first mold 1 and a second mold 2 which are opposite to each other, and the centers of the first mold 1 and the second mold 2 form an inner pressure cavity structure.

[0039] The blank is placed in the inner pressure cavity structure;

[0040] The inner mold assembly comprises a pair of opposite side molds 3 and locking members which are arranged in the inner cavity of the blank, and the side molds 3 can extrude the locking members along the inner cavity to form the inside of the blank;

[0041] The driving assembly is connected with the first mold 1 and the second mold 2 to drive the first mold 1 and the second mold 2 to form the outside of the blank.

[0042] In a specific implementation of the embodiment of the present application, the side mold 3 comprises a mold plate,

[0043] The center of the mold plate is formed with an annular pressing plate, and the blank is in contact with the end surface of the annular pressing plate;

[0044] The inner cavity center of the annular pressing plate is provided with a gas cylinder, the fixed end of the gas cylinder is fixedly connected with the end surface of the mold plate, the movable end of the gas cylinder is fixedly connected with a first pressing block, and the two sides of the first pressing block are provided with first grooves;

[0045] The first pressing block is movably connected with a group of second pressing blocks through the first grooves;

[0046] The second pressing blocks are arranged in the inner cavity region of the annular pressing plate, and the inner cavity region of the annular pressing plate is provided with a group of symmetrically arranged fourth pressing blocks which correspond to the positions of the second pressing blocks, and the second pressing blocks are cooperatively arranged with the locking members;

[0047] The top surface and the bottom surface of the first pressing block are provided with a group of third pressing blocks which are arranged at the end surface of the annular pressing plate and are adapted to the shapes of the first pressing block and the second pressing block.

[0048] The structure of the side mold can be as shown in Figure 2 .

[0049] Referring to Figure 2 , a schematic view of a side view of the side mold provided by the embodiment of the present application is shown, as shown in Figure 2As shown, the side mold 3 comprises a mold plate 31; a ring-shaped pressing plate 32 is formed in the center of the mold plate 31; the blank 4 abuts against the end face of the ring-shaped pressing plate 32; a gas cylinder 33 is arranged in the inner cavity of the ring-shaped pressing plate 32; the fixed end of the gas cylinder 33 is fixedly connected with the end face of the mold plate 31; the movable end of the gas cylinder 33 is fixedly connected with a first pressing block 34; a first groove 35 is formed on the two sides of the first pressing block 34, and a group of second pressing blocks 36 are slidably connected through the first groove; the second pressing blocks 36 are arranged in the inner cavity region of the ring-shaped pressing plate 32, and a group of fourth pressing blocks 38 are symmetrically arranged in the inner cavity region of the ring-shaped pressing plate 32; the fourth pressing blocks 38 correspond to the positions of the second pressing blocks 36; the second pressing blocks 36 are installed in cooperation with the locking members;

[0050] The top surface and the bottom surface of the first pressing block 34 are further provided with a group of polyurethane 37, which can be compressed to provide pressure; the polyurethane 37 is arranged at the end face of the ring-shaped pressing plate 32, and is adapted in shape to the first pressing block 34 and the second pressing block 36.

[0051] The mold plate 31 is adapted in size to the upper mold 1 and the lower mold 2, so that no large gap is generated during extrusion of the press.

[0052] The ring-shaped pressing plate 32 is arranged in the middle of the extrusion end face of the mold plate 31, and is used for supporting and sealing the end face of the blank 4, and fixing the blank 4.

[0053] The gas cylinder 33 can drive the first pressing block 34 to realize extension and retraction, thereby realizing switching between two states in the blank 4 forming process.

[0054] The inner cross section of the first groove 35 is a trapezoidal structure, and the cooperation surface of the first pressing block 34 and the second pressing block 35 is an inclined surface with respect to the vertical plane, so that the second pressing block 35 moves in a direction perpendicular to the movement direction of the first pressing block 34 during the extrusion process, thereby forming an internal support and a shape correction reference of the part.

[0055] When the end face of the blank 4 is provided with an inner groove, the end face of the ring-shaped pressing plate 32 is formed with a fixed protrusion 39; the fixed protrusion 39 corresponds to the position of the inner groove; an injection hole is formed in the fixed protrusion 39; the injection hole extends into the mold plate 31, and is connected with an injection machine 9; the injection machine 9 is used for filling high-pressure liquid into the inner groove.

[0056] In another specific implementation manner of the embodiment of the present application, the locking member comprises: an outer plate and a fifth pressing block; the number of the outer plate is 2, and the two outer plates are respectively arranged on the two sides of the fifth pressing block;

[0057] The two ends of the outer plate are respectively formed with a plurality of plug-in blocks, the plug-in blocks are inserted into the plug-in grooves formed in the end face of the second pressing block, and there is a movable gap between the plug-in blocks and the plug-in grooves;

[0058] The fifth pressing block is extruded and expanded, and the outer plate moves along the movable gap to realize internal forming of the blank.

[0059] As shown in Figure 3 The fifth pressing block 51 and the outer surface of the polyurethane 37 are both provided with a second groove.

[0060] The locking member comprises the outer plate 5 and the fifth pressing block 51, the outer plate 5 is provided with two plates and is arranged on the two sides of the fifth pressing block 51 respectively, the two ends of the outer plate 5 are respectively formed with a plurality of plug-in blocks 52, the plug-in blocks 52 are inserted into the plug-in grooves arranged on the end surface of the second pressing block 36, the plug-in blocks 52 have a movable gap in the plug-in grooves, and the outer plate 5 moves along the movable gap after the fifth pressing block 51 is extruded and expanded, so that internal forming of the blank 4 is realized.

[0061] The fifth pressing block 51, the polyurethane 37 and the fourth pressing block 38 are all made of a high molecular compound.

[0062] The fifth pressing block 51, the polyurethane 37 and the fourth pressing block 38 are all made of polyurethane, and the polyurethane can be deformed and expanded in a high-pressure state due to its own characteristics.

[0063] The fifth pressing block 51 and the outer plate 5 are separated from the center and are arranged as two blocks.

[0064] In another specific implementation manner of the embodiment of the present application, the two sides of the first pressing block are inclined inclined surfaces;

[0065] The matching end surfaces of the second pressing block and the first block are adapted inclined inclined surfaces.

[0066] As shown in Figure 3 The two sides of the first pressing block 34 are inclined inclined surfaces, and the matching end surfaces of the second pressing block 36 and the first pressing block 34 are also inclined inclined surfaces.

[0067] In another specific implementation manner of the embodiment of the present application, when an inner groove is arranged on the end surface of the blank towards the inner side, the end surface of the annular pressing plate is formed with a fixed protrusion, and the position of the fixed protrusion corresponds to the position of the inner groove;

[0068] The fixed protrusion is provided with a liquid injection hole, the liquid injection hole extends into the mold plate and is connected with a liquid injection machine, so that the inner groove is filled with high liquid pressure through the liquid injection machine.

[0069] In another specific implementation manner of the embodiment of the present application, the driving assembly comprises a pressing machine,

[0070] The pressing machine extrudes the upper mold and the lower mold through two pad plates arranged in correspondence with each other in up and down directions.

[0071] The two pad plates are respectively installed with the upper mold and the lower mold through threads.

[0072] As shown in Figure 2 and Figure 3 The driving assembly comprises a press 6; the press 6 extrudes the upper die 1 and the lower die 2 through two corresponding upper and lower pads 7; the pads 7 are threadedly installed with the upper die 1 and the lower die 2.

[0073] Further, the press 6 serves as an external driving source to apply pressure to the side die 3, the upper die 1 and the lower die 2 to form the blank 4.

[0074] In another specific implementation of the embodiment of the present application, the side die is installed with a fixing block to fixedly connect the side die with the pad.

[0075] As shown in Figure 4 The side die 3 is further installed with a fixing block 8 to fixedly connect the side die 3 with the pad 7.

[0076] In one embodiment of the present application, the fixing block 8 is used to move the side die 3, the upper die 1 and the lower die 2 apart during the transportation and transfer of the whole device; and is used for fixing during the transportation.

[0077] Further, the fixing block 8 is removed during the stamping process.

[0078] In one embodiment of the present application, the air cylinder 33 is a nitrogen cylinder.

[0079] In one embodiment of the present application, the inner pressure cavity formed by the upper die 1 and the lower die 2 is formed with a plurality of recesses finally formed.

[0080] In one embodiment of the present application, the fourth pressing block 38 is fixedly installed on the die plate 31.

[0081] The forming process of the blank 4 in the present application is as follows: the blank 4 is placed on the inner pressure cavity of the lower die 2; the locking member is placed in the inner cavity of the blank 4; the two side dies 3 are inserted into the two side ports of the inner cavity of the blank 4;

[0082] Further, the cylinder 33 drives the first pressing block 34 to move horizontally into the blank 4; the first pressing block 34 slides forward through the first groove 35 and the second pressing block 35; at this time, the fourth pressing block 38 on the template 31 abuts against the second pressing block 35, and simultaneously pushes the second pressing block 35 to move in a direction perpendicular to the movement direction of the first pressing block 34 in the extrusion process, thereby forming an internal support and a shape correction reference of the part; meanwhile, the annular pressing plate 32 pushes the two polyurethane 37 to move forward; until the second pressing block 35 abuts against the polyurethane 37 and the fifth pressing block 51 simultaneously, and the plug-in block 52 is inserted into the plug-in groove of the second pressing block 35; at this time, the press 6 (only the press plate is drawn in the figure) continues to apply pressure, the upper die 1 and the lower die 2 are closed, so that the fifth pressing block 51 and the polyurethane 37 are deformed to expand and deform to the upper and lower surfaces, thereby exerting force on the top surface and the bottom surface of the inner cavity of the blank 4 to make the fifth pressing block 51 and the polyurethane 37 adhere to the inner cavity of the blank 4.

[0083] Further, due to the continuous pressure, and the mating surface of the first pressing block 34 and the second pressing block 35 is an inclined surface with the vertical plane; so that the second pressing block 35 moves outward along the first groove 35 with a trapezoidal structure of the inner cross section; at this time, the plug-in block 35 and the plug-in groove generate a side-to-side displacement, until abutting against the inner wall of the blank 4.

[0084] Further, at this time, due to the limit, the first pressing block 34 and the second pressing block 35 form an integral whole and no longer move relatively; the press 6 continues to apply pressure, causing the cylinder 33 to retract; the second pressing block 35 moves reversely to extrude the fourth pressing block 38 until the gap between the second pressing block 35 and the template 31 is minimized.

[0085] Further, the high-pressure liquid is injected into the groove of the blank 4 through the liquid injection machine 9, and the pressure is 4-6 MPa; the length of the final forming of the blank 4 is adjusted, so that the blank 4 finally produces plastic deformation.

[0086] The specific embodiments described in the present application can enable those skilled in the art to have a more comprehensive understanding of the present application, but in no way limit the present application. Therefore, those skilled in the art should understand that the present application can still be modified or replaced equivalently; and all technical solutions and improvements which do not deviate from the spirit and technical essence of the present application should be covered in the protection scope of the present application patent.

[0087] The contents not described in detail in the specification of the present application are the known technology of those skilled in the art.

Claims

1. A part upset forming die characterized by, The mold comprises an outer mold assembly, a blank, an inner mold assembly and a driving assembly, wherein, The outer mold assembly comprises a pair of upper and lower molds which are opposite to each other and the centers of which form an inner pressure cavity structure; The blank is placed in the inner pressure cavity structure; The inner mold assembly comprises a pair of opposite side molds and a locking piece which is arranged in the inner cavity of the blank and can be pressed by the side molds along the inner cavity to form the inside of the blank; The driving assembly is connected with the upper and lower molds to drive the upper and lower molds to form the outside of the blank; The side mold comprises a mold plate, The center of the mold plate is formed with a ring-shaped pressing plate, and the blank is in contact with the end face of the ring-shaped pressing plate; The inner cavity center of the ring-shaped pressing plate is provided with a gas cylinder, the fixed end of the gas cylinder is fixedly connected with the end face of the mold plate, the movable end of the gas cylinder is fixedly connected with a first pressing block, and the two sides of the first pressing block are provided with a first groove; The first pressing block is movably connected with a group of second pressing blocks through the first groove; The second pressing blocks are arranged in the inner cavity region of the ring-shaped pressing plate, and the inner cavity region of the ring-shaped pressing plate is provided with a group of symmetrically arranged fourth pressing blocks which correspond to the positions of the second pressing blocks, and the second pressing blocks are installed in cooperation with the locking piece; The top surface and the bottom surface of the first pressing block are provided with a group of third pressing blocks which are arranged at the end face of the ring-shaped pressing plate and are adapted to the shapes of the first pressing block and the second pressing blocks; The locking piece comprises an outer plate and a fifth pressing block, the number of the outer plates is two, and the two outer plates are arranged on the two sides of the fifth pressing block respectively; The two ends of the outer plate are respectively formed with a plurality of plug-in blocks which are inserted into plug-in grooves formed in the end face of the second pressing block, and there is a movable gap between the plug-in blocks and the plug-in grooves; After the fifth pressing block is extruded and expanded, the outer plate moves along the movable gap to realize the internal forming of the blank; The two sides of the first pressing block are inclined surfaces; The cooperation end faces of the second pressing blocks and the first pressing block are adapted inclined surfaces; The third pressing blocks and the fourth pressing blocks are made of polyurethane.

2. The mold of claim 1, wherein The fifth pressing block is made of a high molecular compound.

3. The mold of claim 1, wherein When an inner groove is formed in the end face of the blank towards the inner side, a fixed protrusion is formed on the end face of the ring-shaped pressing plate, and the position of the fixed protrusion corresponds to the position of the inner groove.

4. The mold of claim 1, wherein The driving assembly comprises a press, The press extrudes the upper and lower molds through two pad plates which are arranged in correspondence with each other; The two pad plates are respectively installed with the upper mold and the lower mold through threads.

5. The mold of claim 4, wherein, The side mold is provided with a fixed block to fixedly connect the side mold with the pad plate.

Images