A steel plate curved surface forming device

Abstract

This invention discloses a steel plate curved surface forming device, comprising two sets of reconfigurable molds arranged vertically and vertically. Each reconfigurable mold includes a support assembly and a flexible interface. Several support assemblies include a lead screw, a positioning sleeve, and a rotating component. One end of the lead screw is connected to one end of the positioning sleeve. The rotating component includes an inner sphere, an outer sphere, and a connecting column for connecting the inner and outer spheres. An inner cavity is provided at the other end of the positioning sleeve, with the inner sphere located within the cavity and in contact with its bottom. A groove is formed on the top surface of the outer sphere, and sliding tracks communicating with the groove are formed on both sides of the outer sphere. An arc-shaped sliding plate is provided within the groove, in contact with and sliding relative to the groove. The flexible interface is fixedly connected to the top surface of the arc-shaped sliding plate by flat-head bolts. This invention, while meeting the accuracy requirements for forming curved surfaces, can significantly reduce the number of support assemblies and improve the stability of the support assemblies during cold-pressing and bending of steel plates.

Description

TECHNICAL FIELD

[0001] The application relates to a steel plate curved surface forming device and belongs to the technical field of curved surface forming devices. BACKGROUND

[0002] A reconfigurable mold forming method forms a three-dimensional surface as a forming surface by controlling the positioning of each screw rod of a screw rod array. This method can quickly form various curved profiles when used for product modeling. In order to eliminate or reduce the concave / convex marks or wrinkles on the surface of the product and achieve a smoother and more uniform product, the current patent technology generally adopts a rotatable screw rod head and a flexible interface method.

[0003] Chinese patent CN110918790B discloses a reconfigurable mold and its assembly, which cites an American patent (patent name: a device for sheet metal forming, publication number US4212188), a Chinese patent (patent name: square type pressure head adjustable active mold plate curved surface forming device, application number CN200910014794.6) in the background art and points out the shortcomings of the two existing technologies and provides a solution. The technical solution adopted is as follows:

[0004] A reconfigurable mold and its assembly, comprising a support assembly, a flexible interface and a three-dimensional scanner; wherein the support assembly comprises a screw rod, a sliding assembly, a spherical hinge assembly and a flat head bolt; the sliding assembly comprises a sliding rail, a sliding block and a sliding block bearing; the spherical hinge assembly comprises a hinge lower part and a hinge upper part; the upper end of the screw rod is provided with a rotating assembly or the spherical hinge assembly; the flexible interface is fixedly connected with the hinge upper part or the sliding block through the flat head bolt; and the three-dimensional scanner is installed directly above the flexible interface.

[0005] On the one hand, the flexible interface and the support assembly are fixed in the vertical direction, and the support assembly can drive the flexible interface to move up and down in the vertical direction; on the other hand, the flexible interface connection point and the support assembly are allowed to freely slide and rotate, greatly reducing / eliminating the friction between them, further reducing / eliminating the internal force of the flexible interface and the lateral external force of the screw rod, and improving the service life of the flexible interface and the screw rod; in addition, by adopting the screw rod positioning-three-dimensional scanning feedback-adjusting positioning mode, the number of support assemblies can be greatly reduced on the basis of meeting the control accuracy of the forming surface, and the control difficulty and control cost of the support assembly are reduced.

[0006] The support assembly provided by this invention requires the use of a long, narrow slide rail so that the tension of the flexible interface can drive the slider to slide along the slide rail and then drive the spherical hinge assembly or the flexible interface to move. However, the long, narrow slide rail is not conducive to the formation of the curved surface of the flexible interface, and multiple adjustments are required to match the three-dimensional curved surface formed by the flexible interface with the target interface. It is even more inadequate for the forming requirements of some plates with high curvature requirements. In addition, setting too many transition components at the end of the lead screw is not conducive to the cold bending forming of the plate. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a steel plate curved surface forming device that, while meeting the accuracy requirements for forming curved surfaces, can significantly reduce the number of support assemblies and improve the stability of the support assemblies during cold pressing and bending of steel plates.

[0008] The technical solution adopted in this invention is as follows:

[0009] A steel plate curved surface forming device includes two sets of reconfigurable molds arranged correspondingly at the top and bottom, wherein the reconfigurable molds include:

[0010] A support assembly, comprising several such assemblies, includes a lead screw, a positioning sleeve, and a rotating assembly; one end of the lead screw is connected to one end of the positioning sleeve; the rotating assembly includes an inner sphere, an outer sphere, and a connecting post for connecting the inner sphere and the outer sphere; an inner cavity is provided at the other end of the positioning sleeve, the inner sphere is located in the inner cavity and fits against the bottom of the inner cavity; the connecting post passes through the top opening of the inner cavity and a rubber sleeve fitted on the connecting post located in the inner cavity fits against the side wall of the inner cavity; a groove is provided on the top surface of the outer sphere, and slideways communicating with the groove are provided on both sides of the outer sphere; an arc-shaped sliding plate is provided in the groove and fits against and slides relative to the groove; arc-shaped guide plates are provided on both sides of the arc-shaped sliding plate and extend into the corresponding slideways, the guide plates sliding in the corresponding slideways;

[0011] A flexible interface is fixedly connected to the top surface of an arc-shaped sliding plate by flat-head bolts;

[0012] The lead screw moves up and down by rotating the paired nuts, which drives the positioning sleeve and the rotating assembly at the end of the lead screw to move up and down synchronously. After the adjacent lead screws are raised and lowered to different heights, the internal stress of the flexible interface will cause the outer ball of the rotating assembly to shift and rotate, and the inner ball will shift and rotate in the inner cavity.

[0013] As a preferred embodiment of the present invention, the connecting column is recessed inward in the direction of column extension.

[0014] As a preferred embodiment of the present invention, a bolt hole is provided at the center of the top surface of the arc-shaped sliding plate, which is matched with a flat-head bolt.

[0015] As a preferred embodiment of the present invention, a rubber ring is provided outside the rotating column located on the outer side of the end of the positioning sleeve, and the rubber ring is fixed on the positioning sleeve.

[0016] The end of the positioning sleeve is provided with a countersunk groove for the insertion of the end of the lead screw, and a bearing is provided at the end of the lead screw and is embedded in the countersunk groove by interference fit.

[0017] As a preferred embodiment of the present invention, a three-dimensional scanner is also provided on one side of the two sets of reconfigurable molds arranged correspondingly above and below. The three-dimensional scanner scans the three-dimensional curved surface formed by the flexible interface and transmits the image data to the control center for comparison with the target curved surface data.

[0018] In a preferred embodiment of the present invention, the 3D scanner is mounted on a fixed frame, a longitudinal guide rail module is provided on the top extension direction of the fixed frame, a lateral telescopic device is provided on the slide of the longitudinal guide rail module toward the gap between the two reconfigurable molds, a U-shaped fixed frame is provided at the end of the lateral telescopic device, and the 3D scanner is provided above and below the fixed frame.

[0019] The beneficial effects of this invention are as follows:

[0020] By using a support assembly to move the flexible interface up and down vertically, and by using a positioning sleeve and a rotating component to allow free offset and rotation between the connection point of the flexible interface and the support assembly, the internal force of the flexible interface can be reduced, the service life of the flexible interface can be improved, and the number of support assemblies can be significantly reduced while meeting the control accuracy of the formed curved surface.

[0021] The structure of the rotating assembly can accommodate the forming requirements of more sheet materials with high curvature requirements, and can improve the stability of the support assembly during cold bending of steel plates. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the reconfigurable module.

[0023] Figure 2 A schematic diagram of the structure supporting the connection between the composite and flexible interfaces;

[0024] Figure 3 A schematic diagram of the supporting structure;

[0025] Figure 4 This is a schematic diagram of the sleeve end structure;

[0026] Figure 5 This is a schematic diagram of the structure at the 3D scanner location. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1-5 As shown: This embodiment is a steel plate curved surface forming device, including two sets of reconfigurable molds arranged correspondingly at the top and bottom. The reconfigurable molds include a support assembly 1 and a flexible interface 2.

[0029] Several support assemblies 1 include a lead screw 3, a positioning sleeve 4, and a rotating assembly; one end of the lead screw 3 is connected to one end of the positioning sleeve 4; the rotating assembly includes an inner ball 5, an outer ball 6, and a connecting post 7 for connecting the inner ball 5 and the outer ball 6; an inner cavity 8 is provided at the other end of the positioning sleeve 4, the inner ball 5 is located in the inner cavity 8 and fits against the bottom of the inner cavity 8; the connecting post 7 is recessed inward in the direction of its extension, and the connecting post 7 passes through the top opening of the inner cavity 8 and is sleeved on the connecting post 7 located in the inner cavity 8. There is a rubber sleeve 9 that fits against the side wall of the inner cavity 8; a groove 10 is provided on the top surface of the outer sphere 6, and slide rails 11 connected to the groove 10 are provided on both sides of the outer sphere 6. An arc-shaped slide plate 12 is provided in the groove 10 and is fitted to the groove 10 and slides relative to it. Arc-shaped guide plates 13 extending into the corresponding side slide rails 11 are provided on both sides of the arc-shaped slide plate 12. The guide plates 13 slide in the corresponding slide rails 11. In practical applications, the support assembly 1 does not need to be arranged too densely to reduce the difficulty of control and the cost of the device.

[0030] The flexible interface 2 is fixedly connected to the top surface of the arc-shaped slide plate 12 by a flat-head bolt 14. A bolt hole is provided at the center of the top surface of the arc-shaped slide plate 12 to match the flat-head bolt 14.

[0031] The lead screw 3 moves up and down by rotating the paired nuts, which drives the positioning sleeve 4 at the end of the lead screw 3 and the rotating assembly to move up and down synchronously. After the adjacent lead screws 3 are raised and lowered to different heights, the internal stress of the flexible interface 2 will cause the outer ball 6 of the rotating assembly to shift and rotate, and the inner ball 5 will follow the shift and rotate in the inner cavity 8.

[0032] A rubber ring 15 is provided on the outside of the rotating column located on the outer side of the end of the positioning sleeve 4. The rubber ring 15 is fixed on the positioning sleeve 4. When the internal stress of the flexible interface 2 causes the outer ball 6 of the rotating component to shift and rotate, the connecting column 7 will squeeze the rubber ring 15, thereby providing a certain buffering effect.

[0033] The end of the positioning sleeve 4 is provided with a recess for the end of the lead screw 3 to be inserted. A bearing 16 is provided at the end of the lead screw 3 and is embedded in the recess through an interference fit. Through this structure, the positioning sleeve 4 can also rotate relative to the lead screw 3. When the internal stress of the flexible interface 2 causes the outer ball 6 of the rotating component to deflect and rotate, the positioning sleeve 4 can also be driven to rotate relative to it, thereby compensating for the rotation to a certain extent.

[0034] A 3D scanner 17 is also provided on one side of the two sets of reconfigurable molds that are set up correspondingly on the top and bottom. The 3D scanner 17 scans the 3D curved surface formed by the flexible interface 2 and transmits the image data to the control center for comparison with the target curved surface data.

[0035] The 3D scanner 17 is mounted on the fixed frame 18. A longitudinal guide rail module 19 is provided on the top extension direction of the fixed frame 18. A transverse telescopic device 20 is provided on the slide of the longitudinal guide rail module 19, which faces the gap between the two reconfigurable molds. A U-shaped fixed frame 21 is provided at the end of the transverse telescopic device 20. The 3D scanner 17 is provided above and below the fixed frame 21.

[0036] When a flat steel plate needs to be cold-bent, the graphic data of the three-dimensional curved surface is first imported into the control computer of this invention. The paired nuts are rotated, and the lead screw 3 is raised and lowered according to the graphic data. The connection points of the flexible interface 2 are raised and lowered. Due to the tension, the flexible interface 2 will pull the outer ball 6 to rotate. After the outer ball 6 abuts against the rubber ring 15, the flexible interface 2 will continue to pull the arc-shaped slide plate 12 to slide towards the lower point in the slide groove 10 until the connection point is adjusted to the appropriate position and the flexible interface 2 will not be twisted.

[0037] The lifting and lowering of multiple lead screws 3 causes the flexible interface 2 of the two sets of reconfigurable molds to be stretched into a matching three-dimensional curved surface. Then, the lateral telescopic device 20 is activated to push the three-dimensional scanner 17 to move between the two sets of reconfigurable molds. Then, the three-dimensional scanner 17 and the longitudinal guide rail module 19 are activated. The slide of the longitudinal guide rail module 19 moves at a certain speed to scan the flexible interface 2 and transmit the scanned image data to the control computer for comparison with the target curved surface data.

[0038] If the error between the formed surface and the target surface meets the accuracy requirements, the formed surface is used as the mold; if the error between the formed surface and the target surface is greater than the accuracy requirements, the lead screw 3 is adjusted until the error between the surface formed by the flexible interface 2 and the current surface meets the accuracy requirements. Then the steel plate is placed between the two sets of molds, the hydraulic press is started, and the steel plate is cold-pressed and bent until the steel plate surface is formed.

[0039] The parts not disclosed in detail in this invention are all prior art. Prior art can be applied to this invention according to actual needs to achieve the desired technical effect.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A steel sheet camber forming apparatus characterized by comprising: The reconfigurable mold comprises two sets of reconfigurable molds arranged in correspondence with each other, and the reconfigurable mold comprises: The support assembly comprises a lead screw, a positioning sleeve and a rotating assembly; one end of the lead screw is connected with one end of the positioning sleeve; the rotating assembly comprises an embedded sphere, an outer sphere and a connecting column for connecting the embedded sphere and the outer sphere; the other end of the positioning sleeve is provided with an inner cavity, the embedded sphere is located in the inner cavity and is in close contact with the cavity bottom of the inner cavity; the connecting column penetrates through the top opening of the inner cavity and is provided with a rubber sleeve in close contact with the inner cavity sidewall on the connecting column located in the inner cavity; the top surface of the outer sphere is provided with a sliding groove, the outer sphere is provided with sliding channels in communication with the sliding groove on both sides, and an arc-shaped sliding plate is arranged in the sliding groove in close contact with the sliding groove and is arranged in opposite sliding; the arc-shaped guide plates extending into the corresponding sliding channels are arranged on both sides of the arc-shaped sliding plate, and the guide plates slide in the corresponding sliding channels; The flexible interface is fixedly connected with the top surface of the arc-shaped sliding plate through a flat head bolt; The lead screw rotates to make lifting movement through a matched nut, thereby driving the positioning sleeve at the end of the lead screw and the rotating assembly to synchronously make lifting movement; after adjacent lead screws are lifted to different heights, the internal stress of the flexible interface drives the outer sphere of the rotating assembly to deviate and rotate, and the embedded sphere deviates and rotates in the inner cavity.

2. The apparatus according to claim 1, wherein The column body of the connecting column is recessed inward along the length direction.

3. The apparatus according to claim 1, wherein A bolt hole is arranged at the center position of the top surface of the arc-shaped sliding plate and is matched with the flat head bolt.

4. The apparatus according to claim 1, wherein A rubber ring is arranged outside the rotating column at the end of the positioning sleeve, and the rubber ring is fixed on the positioning sleeve.

5. The apparatus according to claim 1, wherein The end of the positioning sleeve is provided with a sink groove for inserting the end of the lead screw, and a bearing is arranged at the end of the lead screw and is embedded in the sink groove through interference fit.

6. The apparatus according to claim 1, wherein A three-dimensional scanner is further arranged on one side of the two sets of reconfigurable molds arranged in correspondence with each other, the three-dimensional scanner scans a three-dimensional curved surface formed by the flexible interface, and transmits image data to a control center for comparison with target curved surface data.

7. A device for forming a curved surface of a steel sheet according to claim 6, wherein The three-dimensional scanner is arranged on a fixed frame, a longitudinal guide rail module is arranged on the top of the fixed frame along the length direction, a transverse telescopic device is arranged on the sliding table of the longitudinal guide rail module and faces the gap between the two reconfigurable molds, a fixed frame with a concave structure is arranged at the end of the transverse telescopic device, and the three-dimensional scanners are arranged above and below the fixed frame.

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