A forming device and forming method for a transfer type corrugated deformation strengthened metal sheet

Abstract

The present invention provides a forming device and a forming method for a transfer type corrugated deformation strengthened metal sheet. In the forming device, the fixed end of the positioning and transmission assembly is fixedly connected to the die holder, and a deformation die and a flattening assembly are respectively arranged at the installation ends of the positioning and transmission assembly. The cross-section of the forming part in the bending die is a structure with horizontal straight lines at both ends and alternating corrugated arcs in the middle; the cross-section of the forming part in the flattening die is a straight line structure. The specific steps of the forming method are as follows: install the deformation die; place the deformed sheet into the limiting frame and perform the bending process, the flattening process and the rolling process in sequence; if a metal sheet with a large anisotropy is required, a conventional limited die pressing deformation process can be carried out; if a metal sheet with no obvious anisotropy is required, a cross-limited die pressing deformation process is carried out. The present invention can increase the effective number of deformation passes while ensuring the strain accumulation efficiency, which is beneficial to obtaining more uniform strain accumulation and obtaining a sheet with better comprehensive performance.

Description

Technical Field

[0001] The present invention relates to the field of sheet metal processing and preparation, and particularly to a forming device and a forming method for a transfer type corrugated deformation strengthened metal sheet. Background Art

[0002] Severe plastic deformation (SPD) process is a typical "top-down" method for preparing high-performance metal materials. By applying severe plastic deformation to metal materials, a large amount of strain is accumulated, thereby achieving the purpose of grain refinement. After severe plastic deformation, the grain size of metal materials can be refined to the micron level, sub-micron level or nano level, which can significantly improve the physical, chemical and mechanical properties of the materials. Typical SPD processes for metal sheets include accumulative roll bonding, high strain rate rolling, equal channel angular pressing, repeated bending and straightening, constrained groove pressing (CGP), etc. The CGP process has a wide range of applications and can be produced almost without changing the size of the metal blank. It has low requirements for equipment and working environment and is an ideal SPD method for preparing large-volume metal sheets at present.

[0003] In the prior art, the CGP process is mostly completed by using flat-tooth dies. The prepared sheets have high strength and hardness, but the plasticity and surface quality often have great losses. The flat-tooth die has sharp edges, which are likely to damage the surface of the specimen. At the same time, the connection between the bending and flattening processes mostly relies on manual methods, with low efficiency and potential safety hazards. In addition, due to the influence of factors such as springback during the deformation process, it is not conducive to the strain accumulation of the deformed specimen in the current pass, nor to the flatness of the deformed specimen. The decrease in the flatness of the specimen after deformation not only affects the positioning of the specimen bending deformation in the next pass, but also causes a deviation between the actual strain accumulation and distribution and the theory.

[0004] Therefore, developing a CGP forming device for corrugated deformation strengthened metal sheets, realizing continuous production of the CGP process, and proposing a CGP deformation process to promote uniform accumulation of equivalent strain are of great significance for improving the efficiency of the CGP process, improving the surface quality of materials, ensuring the accuracy of the connection of each step of the CGP process, and obtaining CGP sheets with better comprehensive performance. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the present invention provides a forming device and a forming method for a transfer type corrugated deformation strengthened metal sheet. Through the combination of bevel gear sets and gear racks in the positioning and transmission components, the deformation die located on the workbench is driven to move along the dovetail groove guide rail to the limiting frame station. With the assistance of the pressing block, the deformed sheet is alternately subjected to bending deformation and flattening deformation, so as to complete the die pressing deformation of the conventional path or the die pressing deformation of the 90° cross path. The corrugated circular teeth in the bending die can effectively reduce the damage to the surface of the specimen. By introducing the strain mechanism of small strain and multiple passes, while ensuring the strain accumulation efficiency, the effective number of deformation passes is increased, the surface quality of the sheet after deformation is improved, and a sheet with better comprehensive performance and the optimal deformation passes suitable for the sheet are obtained.

[0006] The present invention provides a forming device for a transfer type corrugated deformation strengthened metal sheet, which includes a die holder, a positioning and transmission assembly, a deformation die and a flattening assembly. The fixed end of the positioning and transmission assembly is fixedly connected to the die holder, and the installation ends of the positioning and transmission assembly are respectively provided with a deformation die and a flattening assembly. The die holder includes an upper die base, a lower die base, guide columns and guide sleeves. The first installation end of the upper die base is fixedly connected to the first end of the guide sleeve, the first installation end of the lower die base is fixedly connected to the first end of the guide column, and the second end of the guide sleeve is slidably connected to the second end of the guide column. The deformation die includes a bending die and a flattening die. The bending die includes an upper bending die and a lower bending die, and the flattening die includes an upper flattening die and a lower flattening die. The positioning and transmission assembly includes a dovetail groove guide rail, a workbench, a rack, a positioner, a reduction motor, a transmission shaft, a bracket, bevel gears, spur gears, a pressing block and a limiting frame. The first installation ends of the upper dovetail groove guide rail and the lower dovetail groove guide rail are respectively fixedly connected to the second installation ends of the upper die base and the lower die base. The first ends of the upper workbench and the lower workbench are slidably connected to the second installation ends of the upper dovetail groove guide rail and the lower dovetail groove guide rail respectively through splines. The second ends of the upper workbench and the lower workbench are respectively connected to the deformation die. The third ends of the upper workbench and the lower workbench are respectively fixedly connected to an upper rack and a lower rack. The installation end of the bracket is connected to the third installation end of the lower die base. The housing of the reduction motor is connected to the fixed end of the bracket. The output end of the reduction motor is connected to the axis of the driving bevel gear. The first end of the transmission shaft is connected to the axis of the driven bevel gear. The driving bevel gear meshes with the driven bevel gear. The second end of the transmission shaft sequentially passes through the through holes of the upper die base and the upper dovetail groove guide rail and is connected to the third installation end of the lower dovetail groove guide rail. The third installation end and the fourth installation end of the transmission shaft are respectively connected to the axes of the driving spur gear and the driven spur gear. The driving spur gear and the driven spur gear respectively mesh with the lower rack and the upper rack. Positioners are respectively arranged at the positioning ends of the upper dovetail groove guide rail and the lower dovetail groove guide rail. The first end of the limiting frame is connected to the fourth installation end of the lower dovetail groove guide rail. The fixed end of the pressing block is connected to the third installation end of the upper dovetail groove guide rail. The flattening assembly includes a roller, a push plate, a guide plate, a clamp and a small hydraulic cylinder. The roller is connected to the first end of the push plate. The second end of the push plate is connected to the first end of the guide plate. The second end of the guide plate is connected to the second end of the upper workbench. The small hydraulic cylinder is fixedly connected to the installation end of the pressing block through a clamp.

[0007] Preferably, the cross-section of the forming part in the upper bending die and the lower bending die is a structure with horizontal straight lines at both ends and alternating corrugated arcs in the middle; the cross-section of the forming part in the upper flattening die and the lower flattening die is a straight line structure.

[0008] Preferably, in the corrugated arc structure of the bending die, the arcs have the same size, and the length difference between the two horizontal straight lines at both ends is 1 / 4 of the wavelength in the corrugated arc structure to achieve staggered die pressing, and adjacent arcs and straight lines are tangent to each other.

[0009] Preferably, the positioner includes a guide block, a first spring, a first screw and a positioning block. A stepped hole is provided inside the guide block. The first spring and the first screw are respectively located in the stepped hole. The first screw passes through the first spring and is connected to the first end of the positioning block, and the second end of the positioning block is located in the trapezoidal groove of the workbench.

[0010] Preferably, it further includes an ultrasonic vibration assembly, which includes an ultrasonic generator, a transducer and a horn. The horn is a horn with a uniform cross-section and uniform rod. The first end of the horn is connected to the second end of the limiting frame, and the second end of the horn is connected to the ultrasonic generator through the transducer.

[0011] Preferably, the limiting frame, the second spring and the second screw form an auxiliary limiting assembly.

[0012] In the second aspect of the present invention, a forming method for a transfer type corrugated deformation strengthened metal sheet is provided. The specific implementation steps are as follows:

[0013] S1. Alternately install the bending die and the flattening die in the deformation die on the workbench:

[0014] S11. Fix the upper bending die and the lower bending die in the first set of bending dies to the first square grooves of the upper workbench and the lower workbench respectively;

[0015] S12. Taking the first set of bending dies as a reference, first rotate the second set of bending dies 180° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the second set of bending dies to the third square grooves of the upper workbench and the lower workbench respectively;

[0016] S13. Taking the second set of bending dies as a reference, first rotate the third set of bending dies 180° along the normal direction of its own plane, then rotate the third set of bending dies 180° along its transverse direction, and finally fix the upper bending die and the lower bending die in the third set of bending dies to the fifth square grooves of the upper workbench and the lower workbench respectively;

[0017] S14. Taking the third set of bending dies as a reference, first rotate the fourth set of bending dies 180° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the fourth set of bending dies to the seventh square grooves of the upper workbench and the lower workbench respectively;

[0018] S15. Fix the upper flattening die and the lower flattening die in the first, second, third, and fourth sets of flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench and the lower workbench respectively;

[0019] S16. Fix the rolling flat component to the ninth square groove of the upper workbench, fix the corresponding flattening lower die to the ninth square groove of the lower workbench, and place the deformed sheet into the limiting frame;

[0020] S2. Perform die pressing deformation on the deformed sheet along the conventional path:

[0021] S21. Start the reduction motor to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the first set of deformation dies moves to the working position corresponding to the limiting frame, stop and position it through the locator, and stop the reduction motor;

[0022] S22. Use the upper die holder to drive the bending upper die and the pressing block to perform bending deformation on the deformed sheet located on the limiting frame. Ensure that the periphery of the deformed specimen is in a constrained state during the bending deformation, and the upper die holder returns to its original position after deformation;

[0023] S23. Start the reduction motor to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the second set of deformation dies moves to the working position corresponding to the limiting frame, stop and position it through the locator, and stop the reduction motor;

[0024] S24. Use the upper die holder to drive the flattening upper die and the pressing block to perform flattening deformation on the deformed sheet located on the limiting frame. Ensure that the periphery of the deformed specimen is in a constrained state during the flattening deformation, and the upper die holder returns to its original position after deformation;

[0025] S25. Complete the 2nd - 4th bending and flattening processes using the same operation to complete 2 passes of die pressing deformation along the conventional path;

[0026] S26. After each pass or a given number of passes of die pressing deformation along the conventional path, start the reduction motor to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the rolling flat component moves to the working position corresponding to the limiting frame, stop the reduction motor;

[0027] S27. Drive the pressing block to descend through the upper die holder. When the rolling flat component contacts the deformed sheet located on the limiting frame, stop and start the small hydraulic cylinder to make the push plate reciprocate along the guide rail, thereby realizing the rolling flat of the deformed sheet by the rollers. The upper die holder returns to its original position after deformation;

[0028] S28. Repeat steps S21 - S27 to complete multiple passes of die pressing deformation along the conventional path.

[0029] In the third aspect of the present invention, a forming method for a transfer - type corrugated - deformed strengthened metal sheet is provided. The specific implementation steps are as follows:

[0030] S1. Alternately install the bending die and the flattening die in the deforming die on the first set of workbenches:

[0031] S11. Fix the upper bending die and the lower bending die in the first set of bending dies to the first square grooves of the upper workbench and the lower workbench respectively;

[0032] S12. Taking the first set of bending dies as a reference, first rotate the second set of bending dies 90° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the second set of bending dies to the third square grooves of the upper workbench and the lower workbench respectively;

[0033] S13. Taking the second set of bending dies as a reference, first rotate the third set of bending dies 90° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the third set of bending dies to the fifth square grooves of the upper workbench and the lower workbench respectively;

[0034] S14. Taking the third set of bending dies as a reference, first rotate the fourth set of bending dies 90° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the fourth set of bending dies to the seventh square grooves of the upper workbench and the lower workbench respectively;

[0035] S15. Fix the upper flattening die and the lower flattening die in the first, second, third, and fourth sets of flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench and the lower workbench respectively;

[0036] S16. Fix the rolling and flattening assembly to the ninth square groove of the upper workbench, fix the corresponding flattening lower die to the ninth square groove of the lower workbench, and place the deformed sheet into the limiting frame;

[0037] S2. Alternately install the bending die and the flattening die in the deforming die on the second set of workbenches:

[0038] S21. Taking the fourth set of bending dies on the first set of workbenches as a reference, first rotate the first set of bending dies 90° along the normal direction of its own plane, then rotate the first set of bending dies 180° along its transverse direction, and finally fix the upper bending die and the lower bending die in the first set of bending dies to the first square grooves of the upper workbench and the lower workbench respectively;

[0039] S22. Taking the first set of bending dies as a reference, first rotate the second set of bending dies 90° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the second set of bending dies to the third square grooves of the upper workbench and the lower workbench respectively;

[0040] S23. With the second bending die as the reference, first rotate the third bending die 90° along the normal direction of its own plane, and then fixedly connect the upper bending die and the lower bending die in the third bending die to the fifth square groove of the upper workbench and the lower workbench respectively;

[0041] S24. With the third bending die as the reference, first rotate the fourth bending die 90° along the normal direction of its own plane, and then fixedly connect the upper bending die and the lower bending die in the fourth bending die to the seventh square groove of the upper workbench and the lower workbench respectively;

[0042] S25. Respectively fixedly connect the upper flattening die and the lower flattening die in the first, second, third, and fourth flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench and the lower workbench respectively;

[0043] S26. Fix the rolling and flattening assembly to the ninth square groove of the upper workbench, fix the corresponding flattening lower die to the ninth square groove of the lower workbench, and place the deformed sheet into the limiting frame;

[0044] S3. Perform 90° cross-path die pressing deformation on the deformed sheet:

[0045] S31. Use the first workbench to perform the first pass of 90° cross-path die pressing deformation on the deformed sheet;

[0046] S32. Use the second workbench to perform the second pass of 90° cross-path die pressing deformation on the deformed sheet obtained in S31;

[0047] S33. Repeat steps S31 - S32 to complete multiple passes of 90° cross-path die pressing deformation.

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] 1. The present invention provides a waveform circular tooth CGP forming device. Compared with the flat tooth CGP die, there is no sharp edge, which can effectively reduce the damage to the surface of the specimen; during each bending deformation, there is no obvious distinction between the deformed area and the non-deformed area. The sheet material undergoes periodic continuous plastic deformation in the circular arc area of the die, which is beneficial to the coordination of deformation and at the same time reduces the deformation resistance.

[0050] 2. During the conventional die pressing deformation of the present invention, adjacent bending dies are placed staggeredly by rotating 180° along the normal direction of their planes, so that the severely deformed area and the gently deformed area are completely swapped during the front and back deformations of the sheet material, which helps the uniform accumulation of strain in the transverse direction of the sheet material.

[0051] 3. When the 90° cross-molding deformation of the present invention is carried out, the bending dies separated by one time are placed staggeredly by rotating 180° along the normal direction of the plane, so as to ensure that the severely deformed area and the gently deformed area are completely swapped during the front and back deformations of the sheet, so that the strain is evenly accumulated both transversely and longitudinally on the sheet.

[0052] 4. After each pass of deformation is completed, the present invention makes the stress states on both sides of the deformed specimen tend to be consistent by swapping the upper and lower dies, which is also beneficial to the uniform accumulation of strain.

[0053] 5. The single-pass strain accumulation amount of the present invention is small. Through the strain introduction mechanism of small strain and multiple passes, while ensuring the strain accumulation efficiency, the effective number of passes of deformation is increased, which is beneficial to obtaining more uniform strain accumulation, improving the surface quality of the deformed sheet, and obtaining a sheet with better comprehensive performance and the optimal number of deformation passes suitable for the sheet.

[0054] 6. The present invention uses an ultrasonic vibration device to assist in deformation, reduces the springback during the deformation process, ensures the accurate accumulation of equivalent strain, and improves the surface quality of the CGP sheet.

[0055] 7. The present invention can realize various different forms of molding deformation processes, and can prepare fine-grained metal sheets with anisotropy or no obvious anisotropy and better comprehensive mechanical properties.

[0056] 8. The structure of the present invention is reasonable and has a wide application range. Under constrained conditions, the asymmetric bending die and the flattening die are automatically alternated to press the sheet material, so that it undergoes repeated plastic deformation, thereby accumulating a large amount of uniform strain and realizing the refinement of grains. Brief Description of the Drawings

[0057] Figure 1 is the overall axonometric view of a forming device for a transfer-type corrugated deformation strengthened metal sheet of the present invention;

[0058] Figure 2 is the overall front view sectional view of a forming device for a transfer-type corrugated deformation strengthened metal sheet of the present invention;

[0059] Figure 3 is the A-A sectional view of a forming device for a transfer-type corrugated deformation strengthened metal sheet of the present invention;

[0060] Figure 4 is the B-B sectional view of a forming device for a transfer-type corrugated deformation strengthened metal sheet of the present invention;

[0061] Figure 5 is the C-C sectional view of a forming device for a transfer-type corrugated deformation strengthened metal sheet of the present invention;

[0062] Figure 6D cross-sectional view of a forming device for a transfer type corrugated deformation strengthened metal sheet according to the present invention;

[0063] Figure 7 E cross-sectional view of a forming device for a transfer type corrugated deformation strengthened metal sheet according to the present invention;

[0064] Figure 8 Flow chart of conventional path die pressing deformation in a forming method for a transfer type corrugated deformation strengthened metal sheet according to the present invention;

[0065] Figure 9 Flow chart of 90° cross-path die pressing deformation in a forming method for a transfer type corrugated deformation strengthened metal sheet according to the present invention;

[0066] Figure 10 Process schematic diagram of pressing and bending with a 1 / 4 wavelength offset in a forming method for a transfer type corrugated deformation strengthened metal sheet according to the present invention.

[0067] Main reference numerals:

[0068] Lower die base 1, lower dovetail groove guide 2, lower workbench 3, lower rack 4, upper workbench 5, upper rack 6, upper dovetail groove guide 7, upper die base 8, bracket 9, reduction motor 10, driving bevel gear 11, transmission shaft 12, driven bevel gear 13, end cover 14, guide sleeve 15, guide post 16, bending upper die 17, bending lower die 18, flattening upper die 19, flattening lower die 20, guide block 21, pressing block 22, small hydraulic cylinder 23, limiting frame 24, amplitude-changing rod 25, driven spur gear 26, driving spur gear 27, positioning block 28, clamp 29, roller 30, push plate 31, guide plate 32, insert strip 33. Detailed implementation manners

[0069] To elaborate on the technical content, structural features, achieved objectives and effects of the present invention, the following will be described in detail with reference to the accompanying drawings of the specification.

[0070] A forming device for a transfer type corrugated deformation strengthened metal sheet, as shown in Figure 1 、 Figure 2 and Figure 3 shown, which includes a die set, a positioning and transmission assembly, a deformation die, a rolling and flattening assembly, an ultrasonic vibration assembly and an auxiliary limiting assembly. The fixed end of the positioning and transmission assembly is fixedly connected to the die set, and the installation ends of the positioning and transmission assembly are respectively provided with a deformation die and a rolling and flattening assembly.

[0071] The die set, as shown in Figure 1 and Figure 2As shown in the figure, it includes an upper die base 8, a lower die base 1, guide posts 16 and guide sleeves 15. The first mounting end of the upper die base 8 is fixedly connected to the first end of the guide sleeve 15, the first mounting end of the lower die base 1 is fixedly connected to the first end of the guide post 16, and the second end of the guide sleeve 15 is slidably connected to the second end of the guide post 16.

[0072] A deforming die, which includes a bending die and a flattening die. The bending die includes a bending upper die 17 and a bending lower die 18. The flattening die includes a flattening upper die 19 and a flattening lower die 20.

[0073] Specifically, the cross-section of the forming part in the bending upper die 17 and the bending lower die 18 is a structure with horizontal straight lines at both ends and alternating corrugated arcs in the middle; the cross-section of the forming part in the flattening upper die 19 and the flattening lower die 20 is a straight-line structure. Moreover, in the corrugated arc structure of the bending die, the sizes of the arcs are the same, the length difference between the horizontal straight lines at both ends is 1 / 4 of the wavelength in the corrugated arc structure, and adjacent arcs and straight lines are tangent to each other.

[0074] The positioning and transmission assembly, as Figure 1 and Figure 4 shown in the figure, includes a lower dovetail groove guide 2, an upper dovetail groove guide 7, an upper workbench 5, a lower workbench 3, a lower rack 4, an upper rack 6, a positioner, a reduction motor 10, a transmission shaft 12, a bracket 9, a driving bevel gear 11, a driven bevel gear 13, an end cover 14, a driven spur gear 26, a driving spur gear 27, a pressing block 22 and a limiting frame 24; the transmission shaft 12 is a stepped shaft, with splines provided on the upper part, and the transmission shaft 12 can freely pass through the through holes reserved on the upper die base 8 and the upper dovetail groove guide 7; a square groove for installing the deforming die is provided at the second end of the workbench. According to the requirements of the deforming process, the deforming dies in a specific arrangement order can be respectively fixed in the corresponding square grooves by screws, and the outer shape of the pressing block 22 is n-shaped.

[0075] Preferably, the limiting frame 24, the second spring and the second screw form an auxiliary limiting assembly. The limiting frame 24 is of a stepped type and can carry the sheet to be deformed. At the same time, stepped through holes with large holes at the bottom and small holes at the top are correspondingly provided around the limiting frame 24. Blind holes with a smooth hole at the outer end and a threaded hole inside are provided at the corresponding positions of the lower dovetail groove guide 2. The first end of the second spring is connected to the stepped hole of the limiting frame 24, the second end of the second spring is connected to the smooth hole of the lower dovetail groove guide 2, and the second screw passes through the limiting frame 24 and the second spring in sequence and is connected to the threaded hole of the lower dovetail groove guide 2.

[0076] The first mounting ends of the upper dovetail groove guide rail 7 and the lower dovetail groove guide rail 2 are fixedly connected to the second mounting ends of the upper die holder 8 and the lower die holder 1 respectively through pins and screws. The first ends of the upper workbench 5 and the lower workbench 3 are slidably connected to the second mounting ends of the upper dovetail groove guide rail 7 and the lower dovetail groove guide rail 2 respectively through the gib strips 33. The gib strips 33 can keep a proper gap between the workbench and the dovetail groove guide rail during sliding, thereby improving the sliding accuracy of the workbench and ensuring the service life of the dovetail groove guide rail. The second ends of the upper workbench 5 and the lower workbench 3 are respectively connected to the deforming die or the flattening assembly. The third ends of the upper workbench 5 and the lower workbench 3 are fixedly connected to the upper rack 6 and the lower rack 4 respectively. The positioning ends of the upper workbench 5 and the lower workbench 3 are respectively provided with trapezoidal grooves for positioning, and the trapezoidal grooves are communicated by shallower strip-shaped grooves.

[0077] The mounting end of the bracket 9 is fixedly connected to the protruding area and the side wall of the lower die holder 1 through screws. The housing of the reduction motor 10 is connected to the fixed end of the bracket 9 through screws. The output end of the reduction motor 10 is connected to the axis of the driving bevel gear 11. The transmission shaft 12 is vertically installed and realizes rotary motion through the bearings arranged at the lower dovetail groove guide rail 2 and the bracket 9, and is radially positioned through the bearing end cover 14. The first end of the transmission shaft 12 is connected to the axis of the driven bevel gear 13. The driving bevel gear 11 and the driven bevel gear 13 are meshed. The second end of the transmission shaft 12 sequentially passes through the through holes of the upper die holder 8, the upper dovetail groove guide rail 7 and is connected to the third mounting end of the lower dovetail groove guide rail 2. The third mounting end of the transmission shaft 12 is connected to the axis of the driving spur gear 27. The driven spur gear 26 is rotatably connected to the flange fixed on the upper dovetail groove guide rail 7 through a bearing. A spline groove is opened at the inner port of the driven spur gear 26 and is matched with the spline at the fourth mounting end of the transmission shaft 12 to realize rotational or sliding connection. The driving spur gear 27 and the driven spur gear 26 are respectively meshed with the lower rack 4 and the upper rack 6. Positioners are respectively arranged at the positioning ends of the upper dovetail groove guide rail 7 and the lower dovetail groove guide rail 2. The first end of the limiting frame 24 is connected to the fourth mounting end of the lower dovetail groove guide rail 2. The fixed end of the pressing block 22 is connected to the third mounting end of the upper dovetail groove guide rail 7. The pressing blocks 22 are symmetrically distributed on both sides of the upper dovetail groove guide rail 7. During work, the limiting frame 24 continuously descends under the action of the pressing block 22, but always ensures that the periphery of the deformed specimen is in a constrained state until the die is closed to complete the deformation of the sheet.

[0078] Specifically, the positioner, such as Figure 7As shown, it includes a guide block 21, a first spring, a first screw, and a positioning block 28. The inside of the guide block 21 is provided with a stepped hole with a large hole facing inwards and a small hole facing outwards. The positioning block 28 is provided with a threaded blind hole. The first end of the first spring is placed inside the large hole of the guide block 21, the second end of the first spring abuts against the first end of the positioning block 28, and the first screw sequentially passes through the guide block 21 and is screwed into the threaded hole of the positioning block 28. The first spring is always in a compressed state. The second end of the positioning block 28 is of a trapezoidal structure and is located in the trapezoidal groove of the workbench. During operation, the front end of the positioning block 28 is inserted into the trapezoidal groove on the side wall of the workbench for stopping and positioning.

[0079] During operation, the driving bevel gear 11 at the output end of the reduction motor 10 drives the driven bevel gear 13 on the transmission shaft 12 to rotate, thereby driving the driven spur gear 26 and the driving spur gear 27 to rotate, and further driving the meshing transmission of the upper rack 6 and the lower rack 4. Finally, the upper workbench 5 and the lower workbench 3 slide synchronously on the upper dovetail groove guide 7 and the lower dovetail groove guide 2 respectively. The trapezoidal grooves on the side walls of the upper workbench 5 and the lower workbench 3 cooperate with the positioners fixed on the upper dovetail groove guide 7 and the lower dovetail groove guide 2 respectively to achieve positioning and stopping. At the same time, when the force on the workbench in the guide direction is large enough, the spring in the positioner is further compressed, the positioning block 28 withdraws from the trapezoidal groove, and the positioning block 28 slides relatively in the strip-shaped groove on the side wall of the workbench to ensure the directional sliding of the workbench until the positioning block 28 is inserted into the next trapezoidal groove for another stopping and positioning, and then the reduction motor 10 also stops rotating. The trapezoidal grooves on the side walls of the workbench are coated with lubricating oil to ensure the smooth operation of the positioning device and reduce the wear of the corresponding contact surfaces.

[0080] The flattening assembly, as Figure 5 and Figure 6 shown, includes a roller 30, a push plate 31, a guide plate 32, a clamp 29, and a small hydraulic cylinder 23. The outer shape of the clamp 29 is C-shaped. The roller 30 is connected to the first end of the push plate 31, the second end of the push plate 31 is connected to the first end of the guide plate 32, the second end of the guide plate 32 is connected to the second end of the upper workbench 5, and the small hydraulic cylinder 23 is fixedly connected to the installation end of the clamp 29 and the pressing block 22.

[0081] Specifically, the roller 30 realizes rotary motion through the bearings on both sides of the push plate 31. The rotation axis of the roller 30 is parallel to the plane of the lower workbench 3. The push plate 31 slides in the preset guide rail of the guide plate 32. The small hydraulic cylinders 23 are arranged diagonally on both sides of the push plate 31. The two small hydraulic cylinders 23 alternately push the push plate 31 to make the push plate 31 reciprocate along the guide rail, and finally realize the flattening of the plate.

[0082] The ultrasonic vibration assembly, as Figure 1 and Figure 5As shown in the figure, it includes an ultrasonic generator, a transducer, and a horn 25. The horn 25 is a horn with a uniform cross-section and a uniform rod. The first end of the horn 25 is connected to the counterbore at the second end of the limiting frame 24 through a thread. The second end of the horn 25 is connected to the ultrasonic generator through the transducer. During operation, turn on the power button of the ultrasonic generator. The transducer converts the high-frequency electrical signal into mechanical vibration, and the mechanical vibration is transmitted to the limiting frame 24 through the energy-gathering effect of the horn, so that the deformed specimen obtains a large excitation vibration stress to achieve ultrasonic-assisted deformation.

[0083] The following further describes a forming device and a forming method for a transfer-type corrugated deformation-strengthened metal sheet according to the present invention in conjunction with embodiments:

[0084] A forming method for a transfer-type corrugated deformation-strengthened metal sheet according to the present invention includes two methods: conventional path die pressing deformation and 90° cross-path die pressing deformation. According to the differences in the set forming processes, the corresponding die arrangements are matched, and continuous production is realized according to the workstations.

[0085] In the conventional path die pressing deformation, 4 sets of bending dies and 4 sets of flattening dies are respectively taken. As Figure 8 and Figure 10 shown, the specific implementation steps of the conventional path die pressing deformation are as follows:

[0086] S1. Alternately install the bending die and the flattening die in the deformation die on the workbench:

[0087] S11. Fix the upper bending die 17 and the lower bending die 18 in the first set of bending dies to the first square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0088] S12. Taking the first set of bending dies as a reference, first rotate the second set of bending dies 180° along the normal direction of its own plane, and then fix the upper bending die 17 and the lower bending die 18 in the second set of bending dies to the third square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0089] S13. Taking the second set of bending dies as a reference, first rotate the third set of bending dies 180° along the normal direction of its own plane, then rotate the third set of bending dies 180° along its transverse direction (i.e., realizing the replacement of the upper and lower bending dies), and finally fix the upper bending die 17 and the lower bending die 18 in the third set of bending dies to the fifth square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0090] S14. Taking the third set of bending dies as a reference, first rotate the fourth set of bending dies 180° along the normal direction of its own plane, and then fix the upper bending die 17 and the lower bending die 18 in the fourth set of bending dies to the seventh square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0091] S15. Respectively fix the upper flattening die 19 and the lower flattening die 20 in the first set, second set, third set, and fourth set of flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0092] S16. Fix the rolling and flattening assembly to the ninth square groove of the upper workbench 5, fix the corresponding flattening lower die to the ninth square groove of the lower workbench 3, and place the deformed sheet into the limiting frame 24.

[0093] S2. Perform die pressing deformation on the deformed sheet along the conventional path:

[0094] S21. Start the reduction motor 10 to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the first set of deformation dies moves to the working position corresponding to the limiting frame 24, stop and position it through the locator, and stop the reduction motor 10.

[0095] S22. Use the upper die base 8 to drive the bending upper die 17 and the pressing block 22 to continuously move downward. After the limiting frame 24 contacts the pressing block 22, they move downward together to perform bending deformation on the deformed sheet located on the limiting frame 24. During the bending deformation process, ensure that the four sides of the deformed specimen are in a constrained state. After the bending deformation of the die closing sheet is completed, the upper die base 8 drives the bending upper die 17 and the pressing block 22 to reset, and the limiting frame 24 resets under the action of the second spring.

[0096] S23. Start the reduction motor 10 to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the second set of deformation dies moves to the working position corresponding to the limiting frame 24, stop and position it through the locator, and stop the reduction motor 10.

[0097] S24. Use the upper die base 8 to drive the flattening upper die 19 and the pressing block 22 to continuously move downward. After the limiting frame 24 contacts the pressing block 22, they move downward together to perform flattening deformation on the deformed sheet located on the limiting frame 24. During the flattening deformation process, ensure that the four sides of the deformed specimen are in a constrained state. After the flattening deformation of the die closing sheet is completed, the upper die base 8 drives the flattening upper die 19 and the pressing block 22 to reset, and the limiting frame 24 resets under the action of the second spring.

[0098] S25. Complete the 2nd - 4th bending and flattening processes with the same operation to complete 2 passes of die pressing deformation along the conventional path.

[0099] S26. After each pass or a given number of passes of die pressing deformation along the conventional path, start the reduction motor 10 to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the rolling and flattening assembly moves to the working position corresponding to the limiting frame 24, stop and position it through the locator, and stop the reduction motor 10.

[0100] S27. Drive the pressure block 22 to move downward through the upper die holder 8. Stop the movement after the upper surface of the deformed specimen is flush with the upper end surface of the limiting frame 24. Subsequently, alternately start the small hydraulic cylinder 23 to make the push plate 31 reciprocate along the guide rail, so as to realize the rolling flat of the deformed plate by the rollers 30. At the same time, during the above deformation process, the ultrasonic vibration assembly can be selectively started for ultrasonic-assisted deformation.

[0101] S28. Repeat steps S21 - S27 to complete multi-pass conventional path die pressing deformation.

[0102] In the 90° cross-path die pressing deformation, eight sets of bending dies and eight sets of flattening dies are respectively taken. As Figure 9 and Figure 10 shown, the specific implementation steps of the 90° cross-path die pressing deformation are as follows:

[0103] S1. Alternately install the bending dies and flattening dies in the deformation die on the first set of workbenches:

[0104] S11. Fix the upper bending die 17 and the lower bending die 18 in the first set of bending dies to the first square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0105] S12. Taking the first set of bending dies as a reference, first rotate the second set of bending dies 90° along the normal direction of its own plane, and then fix the upper bending die 17 and the lower bending die 18 in the second set of bending dies to the third square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0106] S13. Taking the second set of bending dies as a reference, first rotate the third set of bending dies 90° along the normal direction of its own plane, and then fix the upper bending die 17 and the lower bending die 18 in the third set of bending dies to the fifth square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0107] S14. Taking the third set of bending dies as a reference, first rotate the fourth set of bending dies 90° along the normal direction of its own plane, and then fix the upper bending die 17 and the lower bending die 18 in the fourth set of bending dies to the seventh square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0108] S15. Fix the upper flattening die 19 and the lower flattening die 20 in the first, second, third, and fourth sets of flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0109] S16. Fix the rolling flat assembly to the ninth square groove of the upper workbench 5, fix the corresponding flattening lower die to the ninth square groove of the lower workbench 3, and place the deformed plate into the limiting frame 24.

[0110] S2. Alternately install the bending dies and flattening dies in the deformation die on the second set of workbenches:

[0111] S21. Taking the fourth bending die on the first workbench as a reference, first rotate the first bending die 90° along the normal direction of its own plane, then rotate the first bending die 180° along its transverse direction (i.e., realizing the replacement of the upper and lower bending dies), and finally fixedly connect the upper bending die 17 and the lower bending die 18 in the first bending die to the first square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0112] S22. Taking the first bending die as a reference, first rotate the second bending die 90° along the normal direction of its own plane, and then fixedly connect the upper bending die 17 and the lower bending die 18 in the second bending die to the third square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0113] S23. Taking the second bending die as a reference, first rotate the third bending die 90° along the normal direction of its own plane, and then fixedly connect the upper bending die 17 and the lower bending die 18 in the third bending die to the fifth square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0114] S24. Taking the third bending die as a reference, first rotate the fourth bending die 90° along the normal direction of its own plane, and then fixedly connect the upper bending die 17 and the lower bending die 18 in the fourth bending die to the seventh square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0115] S25. Respectively fixedly connect the upper flattening die 19 and the lower flattening die 20 in the first, second, third, and fourth flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench 5 and the lower workbench 3 respectively.

[0116] S26. Fix the rolling and flattening assembly to the ninth square groove of the upper workbench 5, fix the corresponding flattening lower die to the ninth square groove of the lower workbench 3, and place the deformed sheet into the limiting frame 24.

[0117] S3. Perform 90° cross-path die pressing deformation on the deformed sheet:

[0118] S31. Use the first workbench to perform die pressing and rolling and flattening operations on the deformed sheet, that is, the first-pass 90° cross-path die pressing deformation.

[0119] S32. Use the second workbench to perform die pressing and rolling and flattening operations on the deformed sheet obtained in S31, that is, the second-pass 90° cross-path die pressing deformation.

[0120] S33. Repeat steps S31 - S32 to complete multi-pass 90° cross-path die pressing deformation, and the ultrasonic vibration device can be selectively turned on for ultrasonic-assisted deformation during the deformation process.

[0121] The anisotropy of the metal sheet strengthened by the transfer-type conventional corrugation-limited die pressing deformation process is relatively large, while the metal sheet strengthened by the transfer-type 90° cross-corrugation-limited die pressing deformation process has no obvious anisotropy.

[0122] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A forming device for a transfer type corrugated deformation strengthened metal sheet, characterized in that, it includes a die holder, a positioning and transmission assembly, a deformation die and a flattening assembly. The fixed end of the positioning and transmission assembly is fixedly connected to the die holder, and the installation ends of the positioning and transmission assembly are respectively provided with a deformation die and a flattening assembly; The die holder includes an upper die base, a lower die base, guide columns and guide sleeves. The first installation end of the upper die base is fixedly connected to the first end of the guide sleeve, the first installation end of the lower die base is fixedly connected to the first end of the guide column, and the second end of the guide sleeve is slidably connected to the second end of the guide column; The deformation die includes a bending die and a flattening die. The bending die includes an upper bending die and a lower bending die, and the flattening die includes an upper flattening die and a lower flattening die; The positioning and transmission assembly includes dovetail groove guide rails, workbenches, racks, positioners, reduction motors, transmission shafts, brackets, bevel gears, spur gears, pressing blocks and limiting frames. The first installation ends of the upper dovetail groove guide rail and the lower dovetail groove guide rail are respectively fixedly connected to the second installation ends of the upper die base and the lower die base. The first ends of the upper workbench and the lower workbench are respectively slidably connected to the second installation ends of the upper dovetail groove guide rail and the lower dovetail groove guide rail through splines. The second ends of the upper workbench and the lower workbench are respectively connected to the deformation die. The third ends of the upper workbench and the lower workbench are respectively fixedly connected to the upper rack and the lower rack. The installation end of the bracket is connected to the third installation end of the lower die base. The housing of the reduction motor is connected to the fixed end of the bracket. The output end of the reduction motor is connected to the axis of the driving bevel gear. The first end of the transmission shaft is connected to the axis of the driven bevel gear. The driving bevel gear and the driven bevel gear are meshed. The second end of the transmission shaft sequentially passes through the through holes of the upper die base and the upper dovetail groove guide rail and is connected to the third installation end of the lower dovetail groove guide rail. The third installation end and the fourth installation end of the transmission shaft are respectively connected to the axes of the driving spur gear and the driven spur gear. The driving spur gear and the driven spur gear are respectively meshed with the lower rack and the upper rack. The positioning ends of the upper dovetail groove guide rail and the lower dovetail groove guide rail are respectively provided with positioners. The first end of the limiting frame is connected to the fourth installation end of the lower dovetail groove guide rail. The fixed end of the pressing block is connected to the third installation end of the upper dovetail groove guide rail; The flattening assembly includes a roller, a push plate, a guide plate, a clamp and a small hydraulic cylinder. The roller is connected to the first end of the push plate. The second end of the push plate is connected to the first end of the guide plate. The second end of the guide plate is connected to the second end of the upper workbench. The small hydraulic cylinder is fixedly connected to the installation end of the pressing block through a clamp; The cross-section of the forming part in the upper bending die and the lower bending die is a structure with horizontal straight lines at both ends and alternating corrugated arcs in the middle; The cross-section of the forming part in the upper flattening die and the lower flattening die is a straight line structure.

2. The forming device for a transfer type corrugated deformation strengthened metal sheet according to claim 1, characterized in that, In the corrugated arc structure of the bending die, the sizes of the arcs are the same, and the length difference between the two horizontal straight lines at both ends is 1 / 4 of the wavelength in the corrugated arc structure to achieve staggered die pressing, and adjacent arcs and straight lines are tangent to each other.

3. The forming device for a transfer type corrugated deformation strengthened metal sheet according to claim 1, characterized in that the positioner includes a guide block, a first spring, a first screw and a positioning block. A stepped hole is provided inside the guide block. The first spring and the first screw are respectively located in the stepped hole. The first screw passes through the first spring and is connected to the first end of the positioning block, and the second end of the positioning block is located in the trapezoidal groove of the workbench.

4. The forming device for a transfer type corrugated deformation strengthened metal sheet according to claim 1, characterized in that it further includes an ultrasonic vibration assembly, which includes an ultrasonic generator, a transducer and a horn. The horn is a horn with a uniform cross-section of a uniform rod. The first end of the horn is connected to the second end of the limiting frame, and the second end of the horn is connected to the ultrasonic generator through the transducer.

5. The forming device for a transfer type corrugated deformation strengthened metal sheet according to claim 1, characterized in that the limiting frame, the second spring and the second screw form an auxiliary limiting assembly.

6. A forming method of the forming device for a transfer type corrugated deformation strengthened metal sheet according to any one of claims 1-5, characterized in that the specific implementation steps are as follows: S1. Alternately install the bending die and the flattening die in the deformation die on the workbench: S11. Fix the upper bending die and the lower bending die in the first set of bending dies to the first square grooves of the upper workbench and the lower workbench respectively; S12. Taking the first set of bending dies as a reference, first rotate the second set of bending dies 180° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the second set of bending dies to the third square grooves of the upper workbench and the lower workbench respectively; S13. Taking the second set of bending dies as a reference, first rotate the third set of bending dies 180° along the normal direction of its own plane, then rotate the third set of bending dies 180° along its transverse direction, and finally fix the upper bending die and the lower bending die in the third set of bending dies to the fifth square grooves of the upper workbench and the lower workbench respectively; S14. Taking the third set of bending dies as a reference, first rotate the fourth set of bending dies 180° along the normal direction of its own plane, and then fix the upper bending die and the lower bending die in the fourth set of bending dies to the seventh square grooves of the upper workbench and the lower workbench respectively; S15. Fix the upper flattening die and the lower flattening die in the first, second, third and fourth sets of flattening dies to the second, fourth, sixth and eighth square grooves of the upper workbench and the lower workbench respectively; S16. Fix the rolling and flattening assembly to the ninth square groove of the upper workbench, fix the corresponding flattening lower die to the ninth square groove of the lower workbench, and place the deformed sheet into the limiting frame; S2. Perform die pressing deformation on the deformed sheet along the conventional path: S21. Start the reduction motor to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the first set of deformation dies moves to the corresponding station of the limiting frame, stop and position it through the locator, and stop the reduction motor. S22. Use the upper die holder to drive the bending upper die and the pressing block to bend and deform the deformed sheet located on the limiting frame. During the bending deformation process, ensure that the periphery of the deformed specimen is in a constrained state. After deformation, the upper die holder resets. S23. Start the reduction motor to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the second set of deformation dies moves to the corresponding station of the limiting frame, stop and position it through the locator, and stop the reduction motor. S24. Use the upper die holder to drive the flattening upper die and the pressing block to flatten and deform the deformed sheet located on the limiting frame. During the flattening deformation process, ensure that the periphery of the deformed specimen is in a constrained state. After deformation, the upper die holder resets. S25. Complete the 2nd - 4th bending and flattening processes with the same operation to complete 2 passes of conventional path die pressing deformation. S26. After each pass of conventional path die pressing deformation or a given number of passes of conventional path die pressing deformation, start the reduction motor to make the workbench start to slide under the meshing drive of the spur gear and the rack. When the rolling flat assembly moves to the corresponding station of the limiting frame, stop the reduction motor. S27. Drive the pressing block to descend through the upper die holder. When the rolling flat assembly contacts the deformed sheet located on the limiting frame, stop and start the small hydraulic cylinder to make the push plate reciprocate along the guide rail, thereby realizing the rolling flat of the deformed sheet by the rollers. After deformation, the upper die holder resets. S28. Repeat steps S21 - S27 to complete multiple passes of conventional path die pressing deformation.

7. A forming method of a forming device for a transfer - type corrugated - deformed strengthened metal sheet according to any one of claims 1 - 5, characterized in that, the specific implementation steps are as follows: S1. Alternately install the bending die and the flattening die in the deformation die on the first set of workbench: S11. Fix the bending upper die and the bending lower die in the first set of bending die to the first square grooves of the upper workbench and the lower workbench respectively. S12. Taking the first set of bending die as a reference, first rotate the second set of bending die 90° along the normal direction of its own plane, and then fix the bending upper die and the bending lower die in the second set of bending die to the third square grooves of the upper workbench and the lower workbench respectively. S13. Taking the second set of bending die as a reference, first rotate the third set of bending die 90° along the normal direction of its own plane, and then fix the bending upper die and the bending lower die in the third set of bending die to the fifth square grooves of the upper workbench and the lower workbench respectively. S14. Taking the third set of bending die as a reference, first rotate the fourth set of bending die 90° along the normal direction of its own plane, and then fix the bending upper die and the bending lower die in the fourth set of bending die to the seventh square grooves of the upper workbench and the lower workbench respectively. S15. Fix the flattening upper die and the flattening lower die in the first, second, third, and fourth sets of flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench and the lower workbench respectively. S16. Fix the rolling and flattening component to the ninth square groove of the upper workbench, fix the corresponding flattening lower die to the ninth square groove of the lower workbench, and place the deformed sheet into the limiting frame. S2. Alternately install the bending die and the flattening die in the second set of workbenches in the deformation die: S21. Taking the fourth bending die on the first set of workbenches as a reference, first rotate the first bending die 90° along the normal direction of its own plane, then rotate the first bending die 180° along its transverse direction, and finally fix the bending upper die and the bending lower die in the first bending die to the first square grooves of the upper workbench and the lower workbench respectively. S22. Taking the first bending die as a reference, first rotate the second bending die 90° along the normal direction of its own plane, and then fix the bending upper die and the bending lower die in the second bending die to the third square grooves of the upper workbench and the lower workbench respectively. S23. Taking the second bending die as a reference, first rotate the third bending die 90° along the normal direction of its own plane, and then fix the bending upper die and the bending lower die in the third bending die to the fifth square grooves of the upper workbench and the lower workbench respectively. S24. Taking the third bending die as a reference, first rotate the fourth bending die 90° along the normal direction of its own plane, and then fix the bending upper die and the bending lower die in the fourth bending die to the seventh square grooves of the upper workbench and the lower workbench respectively. S25. Fix the flattening upper die and the flattening lower die in the first, second, third, and fourth flattening dies to the second, fourth, sixth, and eighth square grooves of the upper workbench and the lower workbench respectively. S26. Fix the rolling and flattening component to the ninth square groove of the upper workbench, fix the corresponding flattening lower die to the ninth square groove of the lower workbench, and place the deformed sheet into the limiting frame. S3. Perform 90° cross-path die pressing deformation on the deformed sheet: S31. Use the first set of workbenches to perform the first-pass 90° cross-path die pressing deformation on the deformed sheet. S32. Use the second set of workbenches to perform the second-pass 90° cross-path die pressing deformation on the deformed sheet obtained in S31. S33. Repeat steps S31 - S32 to complete multiple passes of 90° cross-path die pressing deformation.

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