High-elasticity workpiece stretch bending forming device and method
Through the stretching and bending forming device combining a segmented bottom mold and a locking mold, combined with the pre-stretching and rebound compensation steps, the serious rebound problem of high-elastic materials rebound during the stretching and bending forming process is solved, and high-precision plastic deformation control and molding accuracy are achieved.
Patent Information
- Application Number
- CN202510676704.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2025-07-08
AI Technical Summary
The existing stretching and bending forming devices are difficult to accurately control the plastic deformation ratio of high elastic materials, resulting in severe rebound after the mold is unloaded, difficult to accurately control the shape and size, and difficult to accurately predict the rebound compensation amount.
An innovative combination of segmented bottom molds and locking molds and bending mold components is adopted, combining pre-stretching and rebound compensation steps, precise plastic deformation of high elastic materials is achieved by adjusting screws and folding parts, ensuring that the material does not rebound during the plastic deformation process.
It realizes high-precision plastic deformation control, reduces equipment failure rate and maintenance costs, improves molding accuracy and production efficiency, and is suitable for aerospace and precision instrument fields.
Smart Images
Figure CN120268864A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of metal stretch forming, and particularly to a stretch-bending forming device and method for high-elasticity workpieces. Background Art
[0002] Due to their excellent mechanical properties and elastic characteristics, elastic materials can recover their initial dimensions after withstanding impacts, vibrations, or alternating loads, and are widely used in high-end fields such as aerospace and high-end equipment manufacturing to manufacture elastic components such as shaft tips, torsion bars, and spring sheets.
[0003] In the prior art, when processing elastic components with specific bending angles and shape structures, bending forming is a common method, including processes such as press bending, stretch bending, and roll bending. Among them, stretch bending has become an important option for processing complex-shaped elastic components because it can effectively reduce springback and improve forming accuracy. However, the stretch-bending forming technology for high-elasticity components faces many bottlenecks. On the one hand, its bending deformation amount is small, and the deformation process goes through elastic, elastic-plastic, and plastic stages, with the elastic deformation accounting for up to 80%. As a result, it is difficult for the blank to undergo sufficient plastic deformation, and the springback after die unloading is severe, making it difficult to precisely control the shape and size. On the other hand, it is difficult to accurately predict the springback compensation amount. Although increasing the deformation amount can alleviate springback, if the compensation amount is too small, the dimensions do not meet the standards, and if it is too large, defects such as cracking are likely to occur. It can be seen that it is particularly important to control the ratio of elastic deformation to plastic deformation during the deformation process of high-elasticity materials. However, the existing stretch-bending forming devices have complex structures and are difficult to actively apply a pre-stretch deformation amount, and cannot accurately regulate the elastic-plastic deformation ratio of the material.
[0004] Therefore, the prior art can no longer meet the high-precision and high-quality processing requirements of high-elasticity components, and there is an urgent need to develop new stretch-bending forming devices and methods to break through technical problems. Summary of the Invention
[0005] The purpose of this application is to provide a stretch-bending forming device and method for high-elasticity workpieces to solve the problems in the prior art, such as insufficient plastic deformation amount during stretch bending and large springback after die unloading, resulting in difficult precise control of the dimensional accuracy of components.
[0006] The embodiments of this application can be realized through the following technical solutions: A stretch-bending forming device for high-elasticity workpieces, comprising: A segmented bottom die extending along the X direction and positioned on the side of the support base. One side of the segmented bottom die is provided with a die, and there is a cavity for accommodating the workpiece between the die and the bottom die; The mold includes a locking mold and a stretch-bending mold assembly. One end of the locking mold is fixedly connected to one section of the bottom mold and is also fixedly connected to the support base. The other end is rotatably connected to the stretch-bending mold assembly. The hinge point of the locking mold and the stretch-bending mold assembly corresponds to the segmented position of the segmented bottom mold. The free end of the stretch-bending mold assembly is fixedly connected to the other section of the bottom mold. Both ends of the workpiece are fixedly connected to the two sections of the bottom mold respectively. The free end of the stretch-bending mold assembly has a stretching displacement freedom along the X direction relative to the locking mold, and a rotational displacement freedom with the hinge point as the rotation center.
[0007] Furthermore, the stretch-bending mold assembly includes a folding page component, a stretch-bending mold, and an adjusting screw. One side of the stretch-bending mold is fixedly connected to the other section of the bottom mold, and the other side is fixedly connected with two first positioning platforms and a second positioning platform extending along the Y direction. One end of the adjusting screw passes through the first positioning platform along the X direction and is in threaded connection and cooperation with the first positioning platform. One end of the folding page component is rotatably connected to the locking mold, and the other end extends to the side of the stretch-bending mold and passes through the limiting hole on the second positioning platform along the X direction and abuts against the end of the adjusting screw.
[0008] Furthermore, the support base is a frame that penetrates along the X direction. Its side along the Y axis perpendicular to the X axis is open, and a baffle is provided on the other side. The upper and lower edges of the baffle are vertically connected with an upper limiting plate and a lower limiting plate extending towards the open side to form a guide rail groove extending along the X direction.
[0009] Furthermore, one end of the folding page component is rotatably connected to the locking mold through a pin shaft vertically arranged along the Z direction. The upper and lower limiting plates of the baffle are both provided with first positioning holes vertically penetrating along the Z direction. One end of the pin shaft is connected to the folding page component and the end of the locking mold through the first positioning hole.
[0010] Furthermore, one end of the locking mold for cooperating with the folding page component extends along the X direction to insert into the notch at the end of the folding page component, forming a shaping convex part. The end face of the shaping convex part is an arc surface or a spherical surface. The arc surface or the spherical surface extends along the bending path direction when the folding page component rotates around the pin shaft and protrudes towards the rotation direction of the folding page component.
[0011] Furthermore, the folding page component includes a movable page part and a column cylinder part. One end of the movable page part is hinged to the locking mold, and the other end is assembled on the side face of the end face of the stretch-bending mold and is vertically connected to the column cylinder part. The column cylinder part passes through the limiting hole on the second positioning platform along the X direction and abuts against the end of the adjusting screw through a ball. The column cylinder part and the end of the adjusting screw are both adapted to the surface of the ball.
[0012] Furthermore, the locking die and the bending die are both provided with positioning connection holes. The bending die is provided with a plurality of positioning connection holes arranged along the X direction. The positioning bolt passes through the positioning connection holes to be positioned and connected with the workpiece in the cavity.
[0013] Furthermore, it also includes a base plate, the support seat is installed on the base plate, and the base plate is provided with a rotation center of the pin shaft and a center line of the bending die as a reference datum. Marking parts are set on the plate surface of the base plate for different angular positions around the rotation center to mark different angular positions.
[0014] The present application also provides a method for stretching and bending a high elastic workpiece, which uses the stretching and bending device as described above to stretch and bend the workpiece at different angles and with curved surface structures, including the following steps: First, the connection position between the adjusting screw and the first positioning platform is adjusted by rotation to drive the bending die to stretch to a preset length position along the X direction away from the locking die; Then, taking the hinge point of the locking die and the bending die assembly as the rotation center, one section of the bottom die with freedom is rotated to a preset angle position.
[0015] Furthermore, it also includes a bending rebound compensation step, in which springback compensation is performed when the bending exceeds the required bending angle during the forming process; the mold is unloaded, the completed workpiece is taken out, and the bending angle of the completed workpiece is compared with the expected angle value. If there is a deviation between the actual bending angle and the expected angle value, a bending compensation load is applied to the workpiece again according to the deviation value.
[0016] The embodiments of the present application provide a high elastic workpiece stretch bending forming device and method which have at least the following beneficial effects: This device achieves precise plastic deformation of highly elastic materials through an innovative combination of a segmented bottom die, a locking die, and a stretch-bending die assembly. First, the segmented bottom die is designed to correspond to the hinge point position, and with the bidirectional freedom of the free end of the stretch-bending die, it can perform continuous operations of pre-stretching and stretch-bending deformation on the workpiece, accurately control the elastic-plastic deformation ratio of the material, and make it plastically deform while retaining its high elastic properties, greatly improving the applicability of the product in aerospace, precision instruments and other fields. Secondly, the simple mechanical structure design reduces the use of complex transmission components, reduces equipment failure rate and maintenance costs, and improves the accuracy of plastic deformation. The bending angle error can be controlled within ±0.5°, and the surface roughness reaches Ra≤1.6, which is significantly better than traditional molding processes. In addition, the device is easy to operate and has high production efficiency. It can quickly switch the processing of workpieces of different specifications and effectively meet diversified production needs.
[0017] In summary, the present application can pre-stretch and stretch-bend the workpiece. Through pre-stretching, the high-elasticity material enters the yield stage first, ensuring sufficient plastic deformation during the stretch-bending process, effectively suppressing the springback of the material, and still retaining the high-elasticity characteristics of the material after forming. It has the advantages of simple structure and high precision of plastic deformation. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a schematic diagram of the overall structure of a stretch-bending forming device for a high-elasticity workpiece of the present application; Figure 2 is a schematic exploded view of the bottom die and the die; Figure 3 is a schematic diagram of the overall structure of the support base in the present application; Figure 4 is a schematic diagram of the overall structure of the locking die in the present application; Figure 5 is a schematic diagram of the overall structure of the folding page component in the present application.
[0019] Reference Numerals in the Drawings 1 - bottom die; 2 - support base; 21 - baffle; 22 - upper limit plate; 23 - lower limit plate; 3 - locking die; 31 - shaping convex part; 4 - stretch-bending die assembly; 41 - folding page component; 411 - hinge part; 4111 - first end face; 4112 - second end face; 412 - cylindrical part; 42 - stretch-bending die; 421 - first positioning table; 422 - second positioning table; 43 - adjusting screw; 5 - pin shaft; 6 - ball; 7 - bottom plate; 71 - marking part; 110 - positioning connection hole. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] Hereinafter, the present application will be further described based on the preferred embodiments with reference to the drawings.
[0021] In addition, for the convenience of understanding, various components in the drawings are enlarged or reduced, but this is not intended to limit the protection scope of the present application.
[0022] Singular terms also include plural meanings, and vice versa.
[0023] In the description of the embodiments of the present application, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the products of the embodiments of the present application are usually placed during use, it is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, in the description of the present application, in order to distinguish different units, terms such as first and second are used in this specification, but these are not restricted by the manufacturing order and cannot be construed as indicating or implying relative importance. In the detailed description and claims of the present application, their names may be different.
[0024] The terms used in this specification are for the purpose of describing the embodiments of the present application, but are not intended to limit the present application. It should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "connected", "connected to" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be specifically understood.
[0025] For the convenience of description, two directions perpendicular to each other in the horizontal plane in the figure are respectively defined as the X direction and the Y direction, and the third direction perpendicular to the XY plane is the Z direction, and this is used as an example for description.
[0026] Figure 1 is a schematic diagram of the overall structure of a high-elasticity workpiece stretch-bending forming device of the present application, Figure 2 is a schematic diagram of a disassembled state of the bottom die and the die. As Figure 1 , Figure 2 shown, a high-elasticity workpiece stretch-bending forming device includes a segmented bottom die 1 extending along the X direction and positioned on the side of the support base 2. A die is arranged on one side of the segmented bottom die 1. There is a cavity for accommodating the workpiece between the die and the bottom die 1; the die includes a locking die 3 and a stretch-bending die assembly 4. One end of the locking die 3 is fixedly connected to one section of the bottom die 1, and the other end is rotatably connected to the stretch-bending die assembly 4. The hinge point of the locking die 3 and the stretch-bending die assembly 4 corresponds to the segmented position of the segmented bottom die 1, so that the workpiece in the bottom die 1 can adapt to the movement trajectory and force change of the die at this position; Further, the free end of the stretch-bending die assembly 4 is fixedly connected to the other section of the bottom die 1, and both ends of the workpiece are fixedly connected to the two sections of the bottom die 1 respectively. The free end of the stretch-bending die assembly 4 has a stretching displacement degree of freedom along the X direction relative to the locking die 3, and a rotational displacement degree of freedom with the hinge point as the rotation center.
[0027] It should be noted that the free end of the stretch-bending die assembly 4 is the end far from the hinge point of the stretch-bending die assembly 4.
[0028] In some preferred embodiments, the stretch-bending die assembly 4 is a split structure connected by a tension pushing component along the X direction. The tension pushing component can be a structural member such as a spring or a lead screw, so that the two split structural members of the stretch-bending die assembly 4 can move away from each other along the X direction under the action of force to stretch the workpiece fixed in the cavity.
[0029] In some preferred embodiments, the stretch-bending die assembly 4 includes a folding page component 41, a stretch-bending die 42, and an adjusting screw 43. One side of the stretch-bending die 42 is fixedly connected to the other section of the bottom die 1, and the other side is fixedly connected with two first positioning platforms 421 and second positioning platforms 422 extending along the Y direction. One end of the adjusting screw 43 passes through the first positioning platform 421 along the X direction and is in threaded connection and cooperation with the first positioning platform 421. One end of the folding page component 41 is rotatably connected to the locking die 3, and the other end extends to the side of the stretch-bending die 42 and passes through the limiting hole on the second positioning platform 422 along the X direction and abuts against the end of the adjusting screw 43.
[0030] When stretch-bending forming is required, rotate and adjust the connection position between the adjusting screw 43 and the first positioning platform 421 to drive the stretch-bending die 42 or the locking die 3 to stretch away from the locking die 3 along the X direction to a preset length position. Then, with the hinge point of the locking die 3 and the stretch-bending die assembly 4 as the rotation center, rotate any section of the bottom die 1 to a preset angle position.
[0031] Through the above settings, by only changing the fixed position of the workpiece in the bottom die 1, the relative position between the workpiece and the rotation center of the die can be adjusted, which can meet the processing requirements of workpieces with different shapes, sizes and bending requirements, effectively improve the versatility and adaptability of the product, reduce the situation of frequently replacing the die or adjusting the die structure due to workpiece differences, and reduce the production cost. On the other hand, by adopting the process method of stretching first and then bending, the workpiece can cross its elastic stage. At this time, the internal stress state of the material changes. When bending subsequently, since the workpiece has left the elastic deformation range, the internal residual stress is not sufficient to drive it to undergo elastic recovery, thus ensuring the bending forming effect.
[0032] In some preferred embodiments, such asFigure 3 As shown, the support base 2 is a frame that penetrates along the X direction. One side of it along the Y-axis direction is open, and a baffle 21 is provided on the other side. The upper and lower edges of the baffle 21 are vertically connected with an upper limit plate 22 and a lower limit plate 23 that extend towards the open side to form a guide rail groove extending along the X direction, so that the segmented bottom die 1 connected in the support base 2 can only displace along the X direction and can rotate around the above rotation center in the XY plane towards the side away from the baffle 21.
[0033] Furthermore, one end of the folding page component 41 is rotatably connected to the locking die 3 through a pin shaft 5 vertically arranged along the Z direction. The upper and lower limit plates of the baffle 21 are both provided with first positioning holes 221 that vertically penetrate along the Z direction. One end of the pin shaft 5 is connected to the ends of the folding page component 41 and the locking die 3 through the first positioning holes 221, which is used to fix the position of the rotation center and cooperate with the support base 2 to realize the relative rotational displacement of the segmented bottom die 1 in the XY plane.
[0034] In some preferred embodiments, as Figure 4 shown, the locking die 3 is fixedly connected to the support base 2. A section of the bottom die 1 connected to the bending die 42 has a rotational freedom. One end of the locking die 3 for cooperating with the folding page component 41 extends along the X direction to insert into the notch at the end of the folding page component 41 to form a shaping protrusion 31. The end face of the shaping protrusion 31 is an arc surface or a spherical surface. The arc surface or the spherical surface extends along the bending path direction when the folding page component 41 rotates around the pin shaft 5 and protrudes towards the rotation direction of the folding page component 41, which is used to fit the bending trajectory of the workpiece, reduce interference and distortion, avoid stress concentration, and greatly improve the bending accuracy and forming quality of the workpiece.
[0035] In some preferred embodiments, the shape of the shaping protrusion 31 can be set as a complex shape such as an arc surface, a spherical surface or a multi-curved surface according to the shape expected by the bending surface of the workpiece, and the specific shape is not further limited here.
[0036] In some preferred embodiments, as Figure 5 shown, the folding page component 41 includes a movable page part 411. One end of the movable page part 411 is hinged to the locking die 3. The end face of the movable page part 411 facing the bending die 42 includes a first end face 4111 and a second end face 4112. There is an obtuse angle between the first end face 4111 and the second end face 4112. The first end face 4111 is in a beveled surface fit with the end face of the bending die 42, and the second end face 4112 is in a flat surface fit with the side surface of the bending die 42, which is used to not only closely fit the bending die 42 but also apply a reasonable force to it to ensure the smooth progress of the bending operation.
[0037] In some preferred embodiments, the folding page member 41 further includes a cylindrical portion 412. The other end of the loose-leaf portion 411 is perpendicularly connected to the cylindrical portion 412. The cylindrical portion 412 passes through the limiting hole on the second positioning table 422 along the X direction, and abuts against the end of the adjusting screw 43 through a ball 6, and is adapted to the surface of the ball 6. Compared with the force application method in which the cylindrical portion 412 directly contacts the end of the adjusting screw 43, the ball 6 increases the contact surface between the two, and can effectively disperse stress when transmitting the acting force, making the force application more uniform, stable and efficient.
[0038] In some preferred embodiments, the locking die 3 and the stretch-bending die 42 are both provided with positioning connection holes 110. Correspondingly, circular holes are also provided at both ends of the workpiece to be processed. Bolts pass through the positioning connection holes 110 and are connected to the circular holes of the workpiece to be processed for positioning the position of the workpiece in the cavity. Preferably, the stretch-bending die 42 is provided with a plurality of positioning connection holes 110 arranged along the X direction, which can be used for forming workpieces of different lengths, improving the plastic deformation limit of the workpiece by increasing the workpiece length, and avoiding defects such as cracking and breaking due to the stretch-bending deformation of the material exceeding the plastic deformation limit.
[0039] In some preferred embodiments, the locking die 3, the stretch-bending die 42 and the bottom die 1 are mutually cooperating concave and convex dies, and the concave-convex cooperating chamber is a cavity for accommodating the workpiece. The cross-sectional shape in the cavity can be adjusted according to the shape of the workpiece to be processed, and no further limitation is made here.
[0040] In some preferred embodiments, it further includes a bottom plate 7. The support base 2 is installed on the bottom plate 7. The bottom plate 7 is provided with a marking portion 71 around the rotation center at different angular positions on the plate surface of the bottom plate 7 with the rotation axis as the rotation center and the center line of the stretch-bending die 42 as the reference datum for marking different angular positions. The marking method of the marking portion 71 is punching or scribing. These marked positions are used to accurately indicate and measure the rotation angle position of the stretch-bending die 42 relative to the locking die 3.
[0041] In some preferred embodiments, the present application also provides a stretch-bending forming method for a high-elasticity workpiece, which uses the above-mentioned stretch-bending forming device to perform stretch-bending forming of different angles and arc surface structures, including the following steps: First, rotate and adjust the connection position between the adjusting screw 43 and the first positioning table 421 to drive the stretch-bending die 42 to stretch away from the locking die 3 along the X direction to a preset length position; Then, with the hinge point of the locking die 3 and the stretch-bending die assembly 4 as the rotation center, rotate one of the bottom dies 1 with freedom to a preset angle position.
[0042] In some preferred embodiments, it further includes a bending springback compensation step. During the forming process, overbending beyond the required bending angle is performed for springback compensation. After unloading the mold and taking out the machined workpiece, the bending angle of the machined workpiece is compared with the desired angle value. If there is a deviation between the actual bending angle and the desired angle value, a bending compensation load is applied to the workpiece again according to the deviation value.
[0043] For example, if the desired bending angle is 90°, even if the bending angle of the workpiece is positioned at 90°, the actual bending angle of the workpiece is 85°, and the springback amount is estimated to be 5° according to the material properties, then the actual overbending angle is set to 95° for preliminary springback compensation.
[0044] Of course, an overbending load can also be applied during the first bending of the workpiece, that is, according to the estimated springback amount, an angle compensation amount is added to the bending angle of the workpiece, and re-bending after bending is a reliable means to make up for the error.
[0045] The stretch bending forming method will be described in detail below in combination with specific operation steps: S1: Process the initial sheet required for stretch bending forming. The two ends of the initial sheet are respectively provided with round holes for fixing.
[0046] To avoid insufficient machining length, the two ends of the initial sheet need to reserve a length for punching and fixing. The two ends of the blank are pre-punched before machining, and a lubricant is evenly applied to the surface of the blank (except for the two fixed parts).
[0047] S2: Install the bottom die 1 in the support seat 2, and position and install the initial sheet in the cavity between the bottom die 1 and the mold. Use screws to pass through the positioning connection holes 110 at both ends of the mold to fix the initial sheet in the cavity. S3: Turn the adjusting screw 43 to displace the stretch bending die 42 in the X direction away from the locking die 3, so as to apply a pre-tensile deformation amount to the initial sheet, and make the blank enter the plastic deformation stage to form a stretched workpiece. S4: Press the support seat and rotate a section of the bottom die 1 connected to the stretch bending die 42 at a certain speed, so that the stretched workpiece clamped between the stretch bending die 42 and the bottom die 1 rotates around the pin shaft for stretch bending forming to form a stretch bent workpiece. S5: When the stretch bending die 42 is rotated to a predetermined angle, place a dowel pin in the positioning hole on the bottom plate 7 to fix the position of the die. Then, remove the components of the device in sequence and take out the stretch bent workpiece for calibration test.
[0048] If the bending angle in the calibration test is within the error range, use a special fixture to fix the stretch bent workpiece, and then machine to cut off the parts punched at both ends of the stretch bent workpiece and the excess metal, and finally obtain a high-elasticity element with a specific structure.
[0049] If the bending angle of the proofreading test is within or outside the error range, reshaping is carried out again.
[0050] In some preferred embodiments, the initial sheet can be a flat plate or a thin plate with a certain curvature. If it has a curvature, pre-bending is required.
[0051] In some preferred embodiments, the initial sheet can be made of various metal materials with good elasticity, such as spring steel, elastic alloy, aluminum alloy, magnesium alloy, titanium alloy, etc.
[0052] The specific embodiments of the present application have been described in detail above. For those skilled in the art of this technology, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.
Claims
1. A high-elasticity workpiece stretch-bending forming device, characterized in that, Including: A segmented bottom die (1) extending along the X direction and located on the side of the support base (2). One side of the segmented bottom die (1) is provided with a mold, and there is a cavity for accommodating a workpiece between the mold and the bottom die (1). The mold includes a locking mold (3) and a stretch-bending mold assembly (4). One end of the locking mold (3) is fixedly connected to one section of the bottom die (1) and is fixedly connected to the support base (2), and the other end is rotatably connected to the stretch-bending mold assembly (4). The hinge point of the locking mold (3) and the stretch-bending mold assembly (4) corresponds to the segmented position of the segmented bottom die (1). The free end of the stretch-bending mold assembly (4) is fixedly connected to the other section of the bottom die (1). The two ends of the workpiece are respectively fixedly connected to the two sections of the bottom die (1). The free end of the stretch-bending mold assembly (4) has a stretching displacement freedom along the X direction relative to the locking mold (3) and a rotational displacement freedom with the hinge point as the rotation center.
2. The high-elasticity workpiece stretch-bending forming device according to claim 1, wherein: The stretch-bending mold assembly (4) includes a folding page component (41), a stretch-bending mold (42), and an adjusting screw (43). One side of the stretch-bending mold (42) is fixedly connected to the other section of the bottom die (1), and the other side is fixedly connected with two first positioning platforms (421) and a second positioning platform (422) extending along the Y direction. One end of the adjusting screw (43) passes through the first positioning platform (421) along the X direction and is in threaded connection with the first positioning platform (421). One end of the folding page component (41) is rotatably connected to the locking mold (3), and the other end extends to the side of the stretch-bending mold (42) and passes through the limiting hole on the second positioning platform (422) along the X direction and abuts against the end of the adjusting screw (43).
3. The high-elasticity workpiece stretch-bending forming device according to claim 2, wherein: The support base (2) is a frame penetrating along the X direction. Its side along the Y axis perpendicular to the X axis is open, and a baffle (21) is provided on the other side. The upper and lower edges of the baffle (21) are vertically connected with an upper limiting plate (22) and a lower limiting plate (23) extending towards the open side to form a guide rail groove extending along the X direction.
4. The high-elasticity workpiece stretch-bending forming device according to claim 3, wherein: One end of the folding page component (41) is rotatably connected to the locking mold (3) through a pin shaft (5) vertically arranged along the Z direction. The upper and lower limiting plates of the baffle (21) are both provided with first positioning holes (221) vertically penetrating along the Z direction. One end of the pin shaft (5) is connected to the ends of the folding page component (41) and the locking mold (3) through the first positioning holes (221).
5. The high-elasticity workpiece stretch-bending forming device according to claim 4, wherein: One end of the locking die (3) that is used to cooperate with the folding page component (41) extends along the X direction to the notch at the end of the folding page component (41) to form a shaping convex part (31). The end face of the shaping convex part (31) is an arc surface or a spherical surface. The arc surface or the spherical surface extends along the bending path direction when the folding page component (41) rotates around the pin shaft (5), and protrudes towards the rotation direction of the folding page component (41).
6. The high-elastic workpiece stretch-bending forming device according to claim 2, characterized in that: The folding page component (41) includes a hinge part (411) and a cylindrical part (412). One end of the hinge part (411) is hinged to the locking die (3), and the other end is assembled on the side face of the end face of the stretch-bending die (42) and is vertically connected to the cylindrical part (412). The cylindrical part (412) passes through the limit hole on the second positioning table (422) along the X direction and abuts against the end of the adjusting screw (43) through a ball (6). The cylindrical part (412) and the end of the adjusting screw (43) are both adapted to the surface of the ball (6).
7. The high-elastic workpiece stretch-bending forming device according to claim 2, characterized in that: The locking die (3) and the stretch-bending die (42) are both provided with positioning connection holes (110). The number of positioning connection holes (110) provided on the stretch-bending die (42) is several and is arranged along the X direction. The positioning bolts pass through the positioning connection holes (110) to be positioned and connected with the workpiece in the cavity.
8. The high-elastic workpiece stretch-bending forming device according to claim 4, characterized in that: It further includes a bottom plate (7). The support base (2) is installed on the bottom plate (7). Markings (71) are arranged at different angular positions around the rotation center on the plate surface of the bottom plate (7) with the pin shaft (5) as the rotation center and the center line of the stretch-bending die (42) as the reference datum to mark different angular positions.
9. A method for stretch-bending forming of a high-elasticity workpiece, which uses the stretch-bending forming device described in any one of claims 2 to 8 above to perform stretch-bending forming on the workpiece with different angles and arc surface structures, characterized in that, It includes the following steps: First, rotate and adjust the connection position of the adjusting screw (43) and the first positioning table (421) to drive the stretch-bending die (42) to stretch away from the locking die (3) along the X direction to a preset length position; Then, with the hinge point of the locking die (3) and the stretch-bending die assembly (4) as the rotation center, rotate one section of the bottom die (1) with freedom to a preset angular position.
10. The high-elastic workpiece stretch-bending forming method according to claim 9, characterized in that: It further includes a bending springback compensation step. During the forming process, over-bending beyond the required bending angle is performed for springback compensation; the die is unloaded, and the completed workpiece is taken out. The bending angle of the completed workpiece is compared with the expected angle value. If there is a deviation between the actual bending angle and the expected angle value, a bending compensation load is applied to the workpiece again according to the deviation value.