CN107952872B - Hydraulic auxiliary incremental forming device and method based on adjustable flexible multi-support - Google Patents
Hydraulic auxiliary incremental forming device and method based on adjustable flexible multi-support Download PDFInfo
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- CN107952872B CN107952872B CN201711297209.9A CN201711297209A CN107952872B CN 107952872 B CN107952872 B CN 107952872B CN 201711297209 A CN201711297209 A CN 201711297209A CN 107952872 B CN107952872 B CN 107952872B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/005—Incremental shaping or bending, e.g. stepwise moving a shaping tool along the surface of the workpiece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
Abstract
The invention discloses a hydraulic auxiliary incremental forming device and method based on adjustable flexible multi-support, which solves the problem that the processing of a complex-profile large-forming-angle plate cannot be realized in the prior art, has the advantages of delaying cracking, simulating wrinkling, improving forming performance and the like, and adopts the following scheme: the hydraulic auxiliary incremental forming device based on the adjustable flexible multi-support comprises a support base, wherein an adjustable upright post is arranged on the periphery of the support base, the support base and the adjustable upright post form a forming cavity, and flowable liquid with set volume and set pressure is filled in the forming cavity; the plate forming clamp is detachably connected with the adjustable upright post and used for fixing the end part of the plate; the adjustable support is arranged in the forming cavity, the bottom is fixed with the support base, the top is contacted with the sealing top die and supports the plate, and a plurality of plates are arranged; the forming tool head is arranged on the upper surface of the forming cavity; and the controller is connected with the adjustable supports, is used for controlling the height of each adjustable support, controls the forming of the sheet material and is connected with the forming tool head.
Description
Technical Field
The invention relates to the technical field of complex curved surface forming of plates, in particular to a hydraulic auxiliary incremental forming device and method based on adjustable flexibility and multiple supports.
Background
The progressive forming process is a flexible dieless forming technology, and is rapidly developed based on the idea of "layered manufacturing" of rapid prototyping technology. At present, progressive forming is divided into two main forms of single-point and double-point, the double-point progressive forming can be used for forming complex geometric shapes, but the manufacturing of a bottom die still needs to consume large manpower and financial resources, and the processing needs of one-die multi-use or single-die multi-shape and the like cannot be realized, so that the increasingly personalized demands of audiences and enterprises cannot be met.
In the existing progressive forming technology, multi-directional stress exists in the forming of complex shapes, particularly in the positions with larger forming angles and shape change, and the tool head is influenced by multiple loading, so that the phenomena of thinning, increasing, low plasticity, poor forming performance, cracking, wrinkling and the like are easily generated.
The liquid has the characteristics of fluidity, incompressibility, flow lubricity and the like, and the forming performance of the formed part can be greatly improved under the action of liquid pressure, so that the formed part with higher quality is obtained, but the shape of the formed part is simpler at present, and the part with a complex curved surface and a complex configuration cannot be produced.
Because the existing hydraulic auxiliary incremental forming technology lacks a rigid concave-convex variable support, the tool head can only move along the track on the same horizontal plane, and can not form a three-dimensional curvature variable curved surface, particularly a concave-convex multi-variable three-dimensional curved surface and a curved surface with a larger forming angle in the same plane, and meanwhile, the forming of a smaller convex table and a smaller concave table variable curved surface in a local range can not be completed, so that the technology can not meet the personalized requirements of users; in addition, the technology cannot ensure the sealing requirement of liquid in the forming cavity when not being processed; in addition, in order to form a variable curved surface structure in the prior art, the plate is deformed by means of the pressure difference of an upper pressure head hydraulic cylinder and a lower pressure head hydraulic cylinder, but in the forming method, the plate is extruded between the upper pressure head and the lower pressure head to deform along with the change of the pressure difference of the upper pressure head and the lower pressure head, a workpiece is easy to generate an indentation generated by the extrusion of the upper pressure head and the lower pressure head, and the forming surface quality and the forming performance of a formed part are greatly influenced; moreover, the upper pressure head and the lower pressure head are simultaneously changed by the same amplitude, the control difficulty is high, the sheet is easy to generate dislocation and slippage, and the forming limit is greatly restricted due to one-step forming, so that the forming defect is easy to generate; and because of the structural characteristics of upper and lower pressure heads such as size limitation, the formation of large-angle shape and the formation of concave-convex deformation surfaces in a local range cannot be realized.
Thus, new research designs for hydraulically assisted incremental forming devices based on adjustable flexible multi-support are needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a hydraulic auxiliary incremental forming device based on adjustable flexible multi-support, which is provided with a composite support system combining hydraulic prop adjustable hard support and hydraulic pressure flexible support, wherein the hard support comprises a plurality of groups of support posts, various complex curved surfaces are formed by adjusting the support heights at different positions and the heights of the adjustable stand columns, the instability phenomena such as cracking, wrinkling and the like are avoided, and the forming performance is improved.
The specific scheme of the hydraulic auxiliary progressive forming device based on the adjustable flexible multi-support is as follows:
a hydraulically assisted incremental forming device based on adjustable flexible multi-support, comprising:
the periphery of the support base is provided with an adjustable upright post, the support base and the adjustable upright post form a forming cavity, and flowable liquid with set volume and set pressure is filled in the forming cavity;
the plate forming clamp is detachably connected with the adjustable upright post and used for fixing the end part of the plate;
the adjustable support is arranged in the forming cavity, the bottom of the adjustable support is fixed with the support base, the top sealing top die contacts and supports the plates, two end parts of the sealing top die are arranged at the top of the adjustable upright post, the sealing top die and the plates are fixed through the plate forming clamp so as to avoid direct contact between liquid and the plates, and the adjustable support is provided with a plurality of adjustable supports;
the forming tool head is arranged on the upper surface of the forming cavity;
and the controller is connected with the adjustable supports, is used for controlling the height of each adjustable support, controls the forming of the sheet material and is connected with the forming tool head.
According to the device, various complex curved surfaces are formed by adjusting the supporting heights of different positions and the heights of the vertical columns of the forming cavity, the residual forming cavity is filled with liquid, the forming quality of the key positions and the positions where forming defects are easy to occur is improved, the instability phenomena such as cracking and wrinkling are solved, and the forming performance is improved.
Further, in order to realize automatic control, the controller is connected with the adjustable upright post and used for controlling the height of the adjustable upright post.
Further, the adjustable supports are provided with a plurality of groups, two adjacent groups are set at intervals, each group is provided with at least one, the optimal scheme is that 9 adjustable supports are arranged in each group, the 9 adjustable supports are arranged in three rows and three columns, each group of two adjacent adjustable supports are arranged in close proximity, the whole forming device is provided with 25 groups of adjustable support modules, 25 groups of 5 rows and 5 columns are arranged, the two adjacent groups of the interval setting distances are uniformly distributed at the bottom of the forming cavity, the heights of the adjustable supports are adjusted according to the needs, three-dimensional multi-concave-convex change can be realized in different local ranges, meanwhile, smaller bulges and smaller concave-table variable curved surfaces can be formed in the same local range, when the height of the middle adjustable support is highest, the middle of a complex convex curved surface can be formed, and when the height of the middle adjustable support is lower, the middle of the complex concave-convex curved surface can be formed.
Further, adjustable support includes hydraulic sleeve, sets up the hydraulic stem in the hydraulic sleeve, and hydraulic stem bottom sets up return spring, through return spring's setting, when requiring the hydraulic stem to rise, because the effect of spring force, can make the hydraulic stem rise more steadily, when requiring the hydraulic stem to descend, with the help of spring return force effect, realizes the quick return of adjustable support.
Further, the plate forming clamp is annular, a cavity for accommodating the end part of the plate is formed between the end part of the plate forming die and the top of the adjustable upright post, and the plate forming clamp is fixedly connected with the adjustable upright post through a fastener such as a bolt.
Further, the inner side of the top of the adjustable upright post is provided with a groove, a cavity sealing top die is fixed in the groove, and the cavity sealing top die is made of rubber elastic materials, so that the cavity sealing top die can be changed along with the change of the adjustable support and the adjustable upright post according to the needs of different forming curved surfaces, the forming cavity is formed into a closed cavity when the cavity is not processed, the purity of liquid in the cavity is ensured, the service life is prolonged, and the abrasion of the top end of the adjustable support is reduced.
Further, a first hydraulic control unit is arranged in the support base and is connected with each adjustable support one by one.
Further, still set up the second hydraulic control unit in the support base, second hydraulic control unit and each adjustable stand one-to-one, first hydraulic control unit and second hydraulic control unit are connected with the hydraulic pump, the hydraulic pump passes through the pipeline and is connected with the cavity that takes shape, the hydraulic pump sets up the overflow valve, the second hydraulic control unit includes the governing valve, electromagnetism three-position cross H type switching-over valve and hydraulic lock, the hydraulic pump is connected with the adjustable stand with this through the governing valve, electromagnetism three-position cross H type switching-over valve and hydraulic lock, set up the third manometer between hydraulic pump and second hydraulic control unit, the entry and the exit of cavity that takes shape all set up the overflow valve, set up first manometer at the oil inlet, the oil-out sets up the second manometer.
The controller receives signals of the pressure gauges and controls actions of the hydraulic pump, the overflow valve, the first hydraulic control unit and the second hydraulic control unit.
In order to overcome the defects in the prior art, the invention also provides a complex curved surface forming method, and the hydraulic auxiliary incremental forming device based on the adjustable flexible multi-support is adopted.
Further, the use steps are as follows:
1) The plate is arranged on the surface of the forming cavity, and the end part is fixed by a plate forming clamp;
2) Forming a forming track to be input into a controller according to different client requirements by computer-aided manufacturing CAE;
3) According to the geometric shape of the target forming part, the controller controls the height of the adjustable supports, and the heights of different groups of adjustable supports are adjusted in different local ranges; in the same local range, the same group of adjustable support heights are also adaptively adjusted, and finally flexible support conforming to the target forming piece is realized;
4) The forming tool head is processed layer by layer along a preset track, and under the adjustable supporting effect, the forming of the whole and partial concave-convex multi-change large-angle three-dimensional curved surface of the same plate piece can be realized;
5) Along with the depth of processing, the height of the adjustable stand column is controlled by the controller to be reduced, and meanwhile, the height of each adjustable support and the pressure value of the forming cavity are adjusted by the controller according to the process requirement, so that the required large-angle forming limit is finally reached, and the required complex curved surface piece is formed.
The method can be used for manufacturing more regular parts such as hemispherical parts, and can be used for manufacturing personalized and complex parts such as concave-convex multiple-change three-dimensional curved surfaces in the same plane, small convex and small concave multiple-change curved surfaces in a local range, large-angle forming limit curved surfaces and the like.
Compared with the prior art, the invention has the beneficial effects that:
1) The device has the compound braced system that hydraulic prop rigid support and liquid flexible support combined together, through the setting of a plurality of adjustable supports, constitutes adjustable flexible support, and the adjustable stand in the shaping chamber outside has further increased the flexibility degree of shaping in addition, has improved the shaping scope of shaper under the maximum extent, can take shape the complicated panel spare that has concave-convex curved surface simultaneously.
2) By adding flowing liquid in the forming cavity, the forming quality of the existing incremental forming, especially the forming quality of the key position and the position easy to generate defects, is improved by the characteristics of incompressibility and flowing lubricity of the liquid, the destabilization phenomena of cracking, wrinkling and the like are avoided, the forming surface quality is improved, and the forming performance is improved.
3) Through the built hydraulic control unit, the adjustable flexible support is effectively controlled, and meanwhile, the height of the adjustable upright post is synchronously changed along with the height of the forming tool head, so that progressive forming in a stretching state can be realized; controlling the pressure in the forming cavity to a certain value, and displaying the pressure value in real time for adjustment; the liquid in the forming cavity can be prevented from losing when the forming cavity is not processed, and the purity and long-term use of the liquid in the cavity can be ensured; the invention has positive significance for forming various plates with complex curved surface shapes, improving the forming performance, ensuring the surface quality of formed parts, reducing the damage to the formed parts and realizing personalized customized progressive forming.
4) The cavity sealing top die is arranged in the groove, and is made of rubber elastic materials, so that the cavity sealing top die can be changed along with the change of different forming curved surfaces, the cavity is formed into a closed cavity when the cavity is not processed under the change of the adjustable support and the adjustable stand column, the purity of liquid in the cavity is ensured, the service life is prolonged, and the wear of the top end of the adjustable support is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a layout of an adjustable support;
FIG. 3 is a schematic diagram of hydraulic control;
FIG. 4 is an example of a three-dimensional curved surface of a shaped overall relief variation;
fig. 5 is an example of a three-dimensional curved surface with a shaped local concave-convex variation.
In the figure, a support base-1; an electromagnetic three-position four-way H-shaped reversing valve-2; a hydraulic lock-3; a speed regulating valve-4; an overflow valve-5; pressure gauges 1-6; a proportional control valve-7; a pilot-operated pressure reducing valve-8; 2-9 of a pressure gauge; 3-10 of a pressure gauge; a hydraulic pump-11; an overflow valve-12; an adjustable column-13; forming a cavity-14; processing a plate material-15; a sheet forming jig-16; forming a tool head-17; a return spring-18; an adjustable support-19; a cavity sealing top die-20; a sealing ring-21; a bolt-22; washer-23.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As described in the background art, the present application provides a hydraulic auxiliary incremental forming device based on adjustable flexible multi-support in order to solve the above technical problems.
In an exemplary embodiment of the present application, as shown in fig. 1, an adjustable flexible multi-support based hydraulic assist incremental forming apparatus includes a support base, an adjustable column, an adjustable support, and a controller including a hydraulic control unit. The adjustable upright post 13 and the support base 1 are combined to form a forming cavity 14, the plate forming clamp 16 is tightly matched with the upper end of the adjustable upright post 13 at the edge of an opening of the forming cavity 14, a cavity sealing top die 20 is fixed in a groove on the upper end face of the adjustable upright post 13, and the forming cavity is ensured to be a closed cavity by means of a sealing ring 21; the processed plate 15 is fixed between the plate forming clamp 16 and the adjustable upright 13 by bolts 22 and washers 23, and is fixed by extrusion force to be in contact with the top die of the forming cavity 14. The liquid in the forming cavity 14 is controlled by a hydraulic control unit integrated in the support base 1 through the oil inlet B according to the forming needs and forming requirements of different customers 1 And oil outlet B 2 The forming chamber 14 pressure is regulated.
The cavity sealing top die 20 is made of flexible high-elasticity materials, can be changed along with the change of the adjustable support 19 and the adjustable upright post according to the needs of different forming curved surfaces, and forms a closed cavity with the forming cavity 14 when not processing, so that the purity of liquid in the cavity is ensured, the service life is prolonged, and the abrasion of the top end of the adjustable support is reduced.
The arrangement of the adjustable supports 19 is shown in figure 2, the elevation of each unit being controlled by means of a hydraulic control unit in the support base 1, through C 1 、C 2 、C 3 The pressure oil is injected into the oil inlet holes, and the height is stably raised under the action of spring force; through C 1 、C 2 、C 3 Returning oil, the lowering of each unit is quickly returned to the specified height by the spring return force of the return spring 18. The height adjustment of the adjustable upright post 13 is similar to that of the adjustable support 19 module, and the hydraulic control unit is used for controlling the oil port A 1 Oil inlet, oil port A 2 The oil outlet adjustable upright post comprises a cylinder, a stay bar is arranged in the cylinder, and the diameter of the bottom of the stay bar is larger than that of the middle upper sectionAn oil port A with diameter and arranged above the bottom of the stay bar is formed in the cylinder 1 Oil port A 2 The height of the adjustable upright post 13 is increased and arranged below the stay bar; when the hydraulic control unit controls the oil port A 2 Oil inlet, oil port A 1 The height of the adjustable upright 13 is reduced when oil is discharged.
The hydraulic control unit is shown in fig. 3. The hydraulic control unit is composed of a hydraulic pump 11 and an overflow valve 12 to form a power source for providing power for the whole hydraulic control system, and the oil pressure of a main oil way is displayed in real time by means of a third pressure gauge 10. The relief valve 12 protects against excessive oil pressure.
The hydraulic control unit mainly comprises three different control modules:
1. a first hydraulic control unit for controlling the adjustable supports 19, which is controlled by the proportional control valve 7, wherein the proportional valves 7 corresponding to each group of the adjustable supports 10 are arranged up and down, so as to realize different heights of different units, hydraulic oil is input through the hydraulic pump 11, and control oil with different pressures is conveyed into different oil ports, such as C 1 、C 2 、C 3 Thereby controlling different adjustable supporting units of different groups to reach different heights;
2. the second hydraulic control unit for controlling the adjustable upright post 13 comprises an electromagnetic three-position four-way H-shaped reversing valve 2, a hydraulic lock 3 and a speed regulating valve 4, wherein the adjustable upright post 13 requires synchronous operation, when a certain height is required, the liquid pressure value at the moment is determined, hydraulic oil is conveyed by the hydraulic pump 11, and enters an oil port A through an oil way and the speed regulating valve 4 via the electromagnetic three-position four-way H-shaped reversing valve 2 and the hydraulic lock 3 1 When the height reaches a certain level, the valve core of the electromagnetic three-position four-way H-shaped reversing valve 2 is set to be a middle position, the inlet and the outlet are closed, and the adjustable upright 13 is constantly fixed at the same level. The adjustable upright 13 can be precisely locked at any position by the aid of the hydraulic lock 3;
3. the hydraulic control unit for controlling the pressure in the forming cavity 14 comprises a pilot pressure reducing valve 8, an overflow valve 5, a first pressure gauge 6 and a second pressure gauge 9. By setting the pressure of the output port of the pilot pressure reducing valve 8, oil with certain pressure is input into the cavity, the second pressure gauge 9 displays the pressure value of the input end in real time, the value of the first pressure gauge 6 is set, when the pressure value is too low, the forming requirement cannot be met, the pressure of the forming cavity is improved by adjusting the overflow valve 5 and the pilot pressure reducing valve 8, and when the pressure is suddenly increased in the processing process, the pressure of the cavity is reduced by adjusting the overflow valve 5.
In the forming process, the processed plate 15 is firstly fixed between the plate forming clamp 16 and the adjustable upright post 13 to form a closed cavity. With the help of computer aided manufacturing CAE, forming tracks according to different customer requirements, obtaining specific heights of different units of an adjustable support 19 module, specific heights of an adjustable upright post 13 and specific pressure values of a forming cavity by means of a computer, respectively setting set values of an electromagnetic three-position four-way H-shaped reversing valve 2, a proportional control valve 7, a pilot type pressure reducing valve 8 and an overflow valve 5 according to the obtained pressure values, and respectively enabling different pressure oils to pass through an oil port A 2 、A 1 Input adjustable upright post 13 and oil passing port C 1 、C 2 、C 3 Input adjustable support 19 and through oil port B 1 、B 2 Is fed into the forming chamber 14. The change of the pressure value is observed in real time by means of the three pressure gauges 6, 9, 10 and is adjusted accordingly.
After the pressure oil is input, the forming tool head 17 is processed layer by layer along a preset track, a first hydraulic control unit for controlling the adjustable supports 19 is controlled by the proportional control valves 7, the proportional valves 7 corresponding to each group of the adjustable supports 10 are arranged up and down, hydraulic oil is input through the hydraulic pump 11, and the control oil with different pressures is conveyed into different oil ports, such as C, through different proportional control valves 7 1 、C 2 、C 3 The height of the 25 groups of adjustable supports is changed, and different groups of adjustable supports have different heights in different local ranges; in the same local scope, the same group of adjustable supports can also adjust different heights, the forming tool head carries out layer-by-layer processing along a preset track, and under the action of an adjustable support die, the forming of the whole and local concave-convex multi-change large-angle three-dimensional curved surface parts of the same plate part can be realized.
With the deep processing, the height of the adjustable upright post 13 needs to be reduced, and at the moment, the electromagnetic three-position four-way H-shaped reversing valve 2 is adjusted to be positionedRight position, at this time through A 2 Inputting pressure oil A 1 The output pressure oil, the height of the adjustable column 13 will be reduced at this time. By means of the hydraulic lock 3, the adjustable column 13 can be lowered continuously with the continued penetration of the machining, eventually reaching the desired forming depth.
During processing, the forming cavity is filled with liquid, when the tool head moves along the track, the liquid is also supported on the plate, a reverse pressure P is formed with the forming force direction of the tool head, a multidirectional stress is formed at the height change position, and a certain protection effect is achieved on the local forming part.
In the forming process, the tool head moves according to a fixed track, the tool head is processed layer by track, the height of the adjustable stand column is adjusted, the depth limit during forming can be increased in a follow-up mode under the condition that the processing is gradually in depth, adjustment is convenient, and particularly for complex structural parts with raised structures, the processing precision can be better guaranteed, and the forming quality of a workpiece is improved. The tool head height is adjusted, so that the adjustment is heavy, and is not as light as the height adjustment of the adjustable upright post.
Accordingly, the forming is completed, and the required complex curved surface piece is formed.
Another exemplary embodiment of the present application is shown in fig. 4, in which an integrally concave-convex three-dimensional curvature curved surface is formed
1) The plate is arranged on the surface of the forming cavity, and the end part is fixed by a plate forming clamp;
2) Forming a forming track to be input into a controller according to different client requirements by computer-aided manufacturing CAE;
3) The controller controls the height of the adjustable support according to the target form geometry. Different sets of adjustable supports have different heights, within different local areas, fig. 4 illustrates an M-shaped member shape, achieving a flexible support conforming to the target form.
4) The forming tool head is processed layer by layer along a preset track, and the forming of the whole concave-convex multi-change large-angle three-dimensional curved surface part of the same plate part can be realized under the action of the adjustable supporting die.
5) Along with the depth of processing, the height of the adjustable stand column is controlled by the controller to be reduced, and meanwhile, the height of each adjustable support and the pressure value of the forming cavity are adjusted by the controller according to the process requirement, so that the required large-angle forming limit is finally reached, and the required complex curved surface piece is formed.
As shown in FIG. 5, another exemplary embodiment of the present application forms a partially concave-convex three-dimensional curvature curve
1) The plate is arranged on the surface of the forming cavity, and the end part is fixed by a plate forming clamp;
2) Forming a forming track to be input into a controller according to different client requirements by computer-aided manufacturing CAE;
3) The controller controls the height of the adjustable support according to the target form geometry. In the same local range, the same group of adjustable supports can also adjust at different heights so as to meet the geometric curved surface requirement of the local position, and fig. 5 is a view showing that the middle position has different local characteristics from the integral curved surface, and finally the flexible support conforming to the target formed piece is realized.
4) The forming tool head is processed layer by layer along a preset track, and the forming of the local concave-convex variable three-dimensional curved surface part of the same plate part can be realized under the action of the adjustable supporting die.
5) Along with the depth of processing, the height of the adjustable stand column is controlled by the controller to be reduced, and meanwhile, the height of each adjustable support and the pressure value of the forming cavity are adjusted by the controller according to the process requirement, so that the required large-angle forming limit is finally reached, and the required complex curved surface piece is formed.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (8)
1. Hydraulically assisted incremental forming device based on adjustable flexible multi-support, comprising: the periphery of the support base is provided with an adjustable upright post, the support base and the adjustable upright post form a forming cavity, and flowable liquid with a set volume and a set pressure is filled in the forming cavity; the plate forming clamp is detachably connected with the adjustable upright post and used for fixing the end part of the plate; the adjustable supports are arranged in the forming cavity, the bottom is fixed with the support base, the top is contacted with the cavity sealing top die and supports the plate, and the adjustable supports are provided with a plurality of adjustable supports; the forming tool head is arranged on the upper surface of the forming cavity; the controller is connected with the adjustable supports and used for controlling the height of each adjustable support, controlling the forming of the sheet material and being connected with the forming tool head, and the controller is connected with the adjustable stand column and used for controlling the height of the adjustable stand column; the adjustable support is provided with a plurality of groups, two adjacent groups are arranged at intervals by a set distance, and each group is provided with at least one group.
2. The hydraulically assisted incremental forming apparatus of claim 1 wherein the adjustable support comprises a hydraulic sleeve having a hydraulic stem disposed therein and a return spring disposed at the bottom of the hydraulic stem.
3. The hydraulically assisted incremental forming apparatus of claim 1 wherein the sheet forming clamp is annular in shape and the sheet forming clamp ends and the adjustable post tops form a cavity for receiving the sheet ends.
4. The hydraulic auxiliary incremental forming device based on adjustable flexible multi-support according to claim 1, wherein a groove is formed in the inner side of the top of the adjustable upright post, a cavity sealing top die is fixed in the groove, and the cavity sealing top die is made of elastic materials.
5. The hydraulically assisted incremental forming apparatus of claim 1 wherein a first hydraulic control unit is disposed in the support base and is in one-to-one connection with each of the adjustable supports.
6. The hydraulic auxiliary incremental forming device based on adjustable flexible multi-support according to claim 5, wherein a second hydraulic control unit is further arranged in the support base and is connected with each adjustable upright one by one, the first hydraulic control unit is connected with a hydraulic pump, and the hydraulic pump is connected with the forming cavity through a pipeline.
7. A complex curved surface forming method, characterized in that a hydraulic auxiliary incremental forming device based on adjustable flexible multi-support according to any one of claims 1-6 is used.
8. The complex surface forming method as claimed in claim 7, wherein the steps of:
1) The plate is arranged on the surface of the forming cavity, and the end part is fixed by a plate forming clamp;
2) Forming a forming track to be input into a controller according to different client requirements by computer-aided manufacturing CAE;
3) According to the geometric shape of the target forming part, the controller controls the height of the adjustable supports, and the heights of different groups of adjustable supports are adjusted in different local ranges; in the same local range, the same group of adjustable support heights are also adaptively adjusted, and finally flexible support conforming to the target forming piece is realized;
4) The forming tool head is processed layer by layer along a preset track, and under the adjustable supporting effect, the three-dimensional curved surface forming of the whole and local concave-convex multiple-change large angle of the same plate can be realized;
5) Along with the depth of processing, the height of the adjustable stand column is controlled by the controller to be reduced, and meanwhile, the height of each adjustable support and the pressure value of the forming cavity are adjusted by the controller according to the process requirement, so that the required large-angle forming limit is finally reached, and the required complex curved surface piece is formed.
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| DE102018125869A1 (en) * | 2018-10-18 | 2020-04-23 | Bayerische Motoren Werke Aktiengesellschaft | Device for supporting at least one component |
| CN110405053A (en) * | 2019-08-05 | 2019-11-05 | 南京工程学院 | A kind of progressive molding auxiliary device for heat treating and its hot-working method |
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