A ball head structure and a multi-point forming die

Abstract

This utility model relates to the field of multi-point forming mold technology, and particularly to a ball-head structure and a multi-point forming mold, aiming to solve the problem of insufficient forming contour accuracy in existing multi-point forming molds. The ball-head structure provided by this utility model includes a ball-head assembly and a base, with the ball-head assembly and base connected by a ball joint. The ball-head assembly includes a fixed pressure head and a movable pressure head. The base drives the ball-head assembly to apply pressure to the sheet metal using the fixed and movable pressure heads. Multiple movable pressure heads are evenly distributed around the axis of the fixed pressure head and configured to move along their own axes. During the forming process, as forming pressure is applied, the movable pressure heads can freely extend and retract under the action of forming force and elastic force of the elastic element, thereby changing the form of fitting a curved surface using multiple line segments in the existing technical solution to a form of fitting a curved surface using multiple points. This increases the flexibility of the ball-head structure in adjusting the spatial curved surface shape locally, improving forming accuracy.

Description

Technical Field

[0001] This utility model relates to the field of multi-point forming mold technology, and in particular to a ball head structure and a multi-point forming mold. Background Technology

[0002] In modern industrial manufacturing, sheet metal bending and stamping processes are widely used in the manufacture of large metal structural components such as pressure vessels, automobiles, ships, and aircraft shells. As a key processing technology, sheet metal forming processes directly determine the forming quality and production efficiency of these large metal structures.

[0003] Current mainstream sheet metal forming technologies primarily rely on various presses and molds to achieve curved surface forming. Typically, each type of curved sheet requires one or more sets of molds to complete the surface forming, resulting in low efficiency and high cost. The moldless multi-point forming device for sheet metal (publication number: CN2548792Y) proposes a moldless multi-point flexible forming technology that constructs a flexible forming surface with dynamic shaping capabilities through a regularly arranged cluster of height-adjustable punch units. This achieves flexible reconstruction of the mold surface based on a discrete punch group, significantly improving the processing efficiency of curved sheet metal components. The multi-point forming technology allows a single set of molds to form various smooth spatial curved surfaces, greatly improving mold compatibility and reducing mold opening costs. However, the essence of this technology is to fit spatial curves with multiple line segments, which has certain defects in the accuracy of the forming contour, especially when the size of the single-point lifting column is large or the curvature of the spatial curved surface is large. Utility Model Content

[0004] The purpose of this invention is to provide a ball head structure and a multi-point forming mold to solve the problem of insufficient forming contour accuracy of existing multi-point forming molds.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A ball joint structure includes a ball joint assembly and a base, wherein the ball joint assembly is ball-jointed to the base;

[0007] The ball head assembly includes a fixed pressure head and a movable pressure head, and the base drives the ball head assembly to apply pressure to the plate by the fixed pressure head and the movable pressure head;

[0008] The multiple movable pressure heads are evenly distributed around the axis of the fixed pressure head and configured to move along their own axial direction.

[0009] Furthermore, the ball head assembly also includes an elastic element for applying a thrust to the movable pressure head, so that the movable pressure head applies pressure to the plate.

[0010] Furthermore, the ball joint assembly also includes a mounting plate and a chassis, with the mounting plate connected to the chassis;

[0011] The fixed pressure head is inserted into the mounting plate and connected to the chassis;

[0012] The movable pressure head is inserted into the mounting plate and slidably connected to the mounting plate;

[0013] One end of the elastic element abuts against the chassis, and the other end abuts against the movable pressure head.

[0014] Furthermore, the ball head assembly also includes a guide post, one end of which is connected to the chassis, and the other end is inserted into the movable pressure head and slidably connected to the movable pressure head;

[0015] The elastic element is fitted onto the guide post.

[0016] Furthermore, the ball joint assembly also includes an arc-shaped pad and a positioning pin;

[0017] The arc-shaped pad is disposed between the mounting plate and the chassis, and the positioning pin is simultaneously inserted into the arc-shaped pad, the mounting plate, and the chassis.

[0018] Furthermore, the ball joint assembly also includes a hemispherical seat, which is connected to the chassis and ball-jointed to the base.

[0019] Furthermore, a first magnet is provided on the hemispherical base, and a second magnet is provided on the base;

[0020] The first magnet and the second magnet attract each other.

[0021] Furthermore, the axis of the fixed pressure head is parallel to the axis of the movable pressure head.

[0022] Furthermore, the elastic element is configured as a disc spring or a compression spring.

[0023] In another aspect, this utility model proposes a multi-point forming mold, including the ball head structure as described above.

[0024] Based on the above technical solutions, the technical effects achieved by this utility model are as follows:

[0025] The ball head structure provided by this utility model includes a ball head assembly and a base, with the ball head assembly and the base connected by a ball joint; the ball head assembly includes a fixed pressure head and a movable pressure head, and the base drives the ball head assembly to apply pressure to the plate by the fixed pressure head and the movable pressure head; multiple movable pressure heads are evenly distributed around the axis of the fixed pressure head and are configured to be able to move along their own axis.

[0026] The ball head structure provided by this utility model is provided with a fixed pressure head and multiple movable pressure balls. The fixed pressure head applies pressure to the plate to drive the plate to form, and the movable pressure heads assist the fixed pressure head in applying pressure to the plate to improve the accuracy of the forming contour.

[0027] Specifically, the fixed pressure head is used to fit the overall shape of the spatial curved surface, while the movable pressure head adjusts the local curved surface shape within a single point size range. During the forming process, as forming pressure is applied, the movable pressure head can freely extend and retract under the action of forming force and elastic force of the elastic component. This changes the form of fitting the curved surface using multiple line segments in the existing technical solution to the form of fitting the curved surface using multiple points, thereby increasing the flexibility of the ball head structure in adjusting the spatial curved surface shape locally.

[0028] Therefore, the ball joint structure provided by this utility model can solve the problems of low fitting accuracy and poor forming quality of multi-point forming molds when the single-point size is large or the curvature of the spatial surface is large. The telescopic adjustment characteristics of the movable pressure head and the universal steering characteristics of the ball joint structure complement each other, greatly increasing the flexibility of multi-point forming molds for spatial curved surface shaping and improving forming quality. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the ball head structure provided in an embodiment of the present utility model;

[0031] Figure 2 This is a cross-sectional schematic diagram of the ball head structure provided in an embodiment of the present utility model.

[0032] Icons: 100, Ball head assembly; 110, Fixed pressure head; 120, Movable pressure head; 130, Elastic element; 140, Mounting plate; 150, Chassis; 160, Guide post; 170, Arc-shaped pad; 180, Locating pin; 190, Hemispherical seat; 191, First magnet;

[0033] 200. Base; 210. Second magnet. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] Multi-point forming molds use multiple line segments to fit spatial curves, which has certain defects in the accuracy of the forming contour. This defect is more pronounced when the size of the single-point lifting column is large or the curvature of the spatial surface is large.

[0038] During sheet metal forming, the ball heads of the multi-point forming mold can swing freely with the applied pressure, thus better conforming to the metal sheet and forming a smooth spatial curved surface structure. Because the top of the ball head has a fixed shape—either a plane or a small-curvature surface—this characteristic limits the deformation of the sheet metal when each ball head presses against the surface, resulting in the sheet retaining the shape of the ball head's top. The deformation of the material pressed by multiple ball heads cannot be coordinated, meaning the spatial curved surface can only be formed by fitting multiple line segments. When the ball head size is large or the curvature of the spatial curved surface is large, the fitting accuracy inevitably decreases, thus affecting the forming quality of the curved surface.

[0039] In view of this, the present invention provides a ball joint structure, including a ball joint assembly 100 and a base 200, wherein the ball joint assembly 100 and the base 200 are ball-jointed; the ball joint assembly 100 includes a fixed pressure head 110 and a movable pressure head 120, and the base 200 drives the ball joint assembly 100 to apply pressure to the plate by the fixed pressure head 110 and the movable pressure head 120; a plurality of movable pressure heads 120 are evenly distributed around the axis of the fixed pressure head 110 and configured to be able to move along their own axial direction.

[0040] The ball head structure provided by this utility model is provided with a fixed pressure head 110 and multiple movable pressure balls. The fixed pressure head 110 applies pressure to the plate to drive the plate to form, and the movable pressure head 120 assists the fixed pressure head 110 in applying pressure to the plate to improve the accuracy of the forming contour.

[0041] Specifically, the fixed pressure head 110 is used to fit the overall shape of the spatial curved surface, while the movable pressure head 120 adjusts the local curved surface shape within a single point size range. During the forming process, as the forming pressure is applied, the movable pressure head 120 can freely extend and retract under the action of the forming force and the elastic force of the elastic element 130, thereby changing the form of fitting the curved surface using multiple line segments in the existing technical solution to the form of fitting the curved surface using multiple points, thus increasing the flexibility of the ball head structure in adjusting the spatial curved surface shape locally.

[0042] Therefore, the ball joint structure provided by this utility model can solve the problems of low fitting accuracy and poor forming quality of multi-point forming molds when the single-point size is large or the curvature of the spatial surface is large. The telescopic adjustment characteristics of the movable pressure head 120 and the universal steering characteristics of the ball joint structure complement each other, greatly increasing the flexibility of multi-point forming molds in adapting to spatial curved surface shapes and improving forming quality.

[0043] It should be noted that simply increasing the number of ball-head structures based on existing technology cannot achieve the effect of the ball-head structure provided in this embodiment. This is because increasing the number of ball-head structures increases the density of ball-head structures per unit area. Firstly, this can lead to insufficient strength in a single ball-head structure, making it difficult to provide adequate support, and even causing deformation during use. Secondly, existing technology does not have sufficient remaining space in actual production to increase the number of ball-head structures.

[0044] The following combination Figure 1 , Figure 2 The structure and shape of the ball head structure provided in this embodiment will be described in detail:

[0045] In an optional embodiment, the ball head assembly 100 further includes an elastic element 130, which applies a thrust to the movable pressure head 120 to apply pressure to the plate. Specifically, the elastic element 130 is configured as a disc spring or a compression spring.

[0046] In this embodiment, the ends of both the fixed pressure head 110 and the movable pressure head 120 that contact the sheet material are spherical. The fixed pressure head 110 and the movable pressure head 120 form a curved or flat surface that contacts the sheet material through point contact points, which can be adjusted by the elastic element 130, thereby better adapting to the shape changes of the sheet material.

[0047] In an optional embodiment, the ball head assembly 100 further includes a mounting plate 140 and a base 150, with the mounting plate 140 connected to the base 150. A fixed pressure head 110 is inserted into the mounting plate 140 and connected to the base 150; a movable pressure head 120 is inserted into the mounting plate 140 and slidably connected to it; and an elastic member 130 abuts against the base 150 at one end and against the movable pressure head 120 at the other end. Specifically, the fixed pressure head 110 can be fixedly connected to the base 150 by integral molding, screw connection, welding, etc. The mounting plate 140 is provided with a through hole for the fixed pressure head 110 and the movable pressure head 120 to pass through. The elastic member 130 applies a thrust to the movable pressure head 120 to cause the movable pressure head 120 to tend to move away from the base 150.

[0048] In an optional embodiment, the ball head assembly 100 further includes a guide post 160. One end of the guide post 160 is connected to the chassis 150, and the other end is inserted into and slidably connected to the movable pressure head 120. The elastic element 130 is fitted onto the guide post 160. Specifically, the guide post 160 is connected to the chassis 150 by screws. The guide post 160 and the mounting plate 140 together ensure the stability of the movable ball head when it moves along its own axis. At the same time, the guide post 160 is used to ensure the stability of the elastic element 130 during deformation so as to provide a stable thrust to the movable pressure head 120.

[0049] In an optional embodiment, the ball joint assembly 100 further includes an arc-shaped pad 170 and a positioning pin 180. The arc-shaped pad 170 is disposed between the mounting plate 140 and the base 150 to adjust the distance between the mounting plate 140 and the base 150 and to facilitate the assembly and disassembly of the ball joint assembly 100. Specifically, multiple arc-shaped pads 170 are evenly distributed around the axis of the base 150. The positioning pin 180 is simultaneously inserted into the arc-shaped pad 170, the mounting plate 140, and the base 150 to achieve positioning among the three, which are connected by screws.

[0050] In an optional embodiment, the ball joint assembly 100 further includes a hemispherical seat 190, which is connected to the chassis 150 and ball-jointed to the base 200. Specifically, the hemispherical seat 190 is connected to the chassis 150 by screws.

[0051] Furthermore, a first magnet 191 is provided on the hemispherical seat 190, and a second magnet 210 is provided on the base 200. Both the first magnet 191 and the second magnet 210 are fixed by screws. The first magnet 191 and the second magnet 210 attract each other to achieve the connection between the hemispherical seat 190 and the ball joint assembly 100 and ensure the flexibility of the ball joint connection.

[0052] In an optional embodiment, the axis of the fixed pressure head 110 is parallel to the axis of the movable pressure head 120. Obviously, the axis of the fixed pressure head 110 and the axis of the movable pressure head 120 may not be parallel, and they may form a certain angle, but this arrangement will reduce the normal pressure exerted by the movable pressure head 120 on the plate.

[0053] In this embodiment, the structure of the ball head consists of eight movable pressure heads 120 and one fixed pressure head 110. The movable pressure heads 120 can move along their own axis to achieve telescopic adjustment, which increases the flexibility of the mold to adapt to spatial curved surface shapes within a single point local area.

[0054] Meanwhile, the telescopic adjustment characteristics of the single-point local moving pressure head 120, combined with the universal steering characteristics of the ball joint structure, further increases the flexibility of the multi-point forming mold in adapting to spatial curved surface modeling and improves the forming quality.

[0055] Based on the ball head structure provided in this embodiment, a multi-point forming mold is proposed, including the ball head structure as described above.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ball-head structure, characterized in that, It includes a ball joint assembly (100) and a base (200), wherein the ball joint assembly (100) is ball-jointed to the base (200); The ball head assembly (100) includes a fixed pressure head (110) and a movable pressure head (120). The base (200) drives the ball head assembly (100) to apply pressure to the plate by the fixed pressure head (110) and the movable pressure head (120). The plurality of movable pressure heads (120) are evenly distributed around the axis of the fixed pressure head (110) and configured to be able to move along their own axial direction.

2. The ball-head structure according to claim 1, characterized in that, The ball head assembly (100) also includes an elastic element (130) for applying a thrust to the movable pressure head (120) to apply pressure to the plate.

3. The ball-head structure according to claim 2, characterized in that, The ball joint assembly (100) also includes a mounting plate (140) and a chassis (150), the mounting plate (140) being connected to the chassis (150); The fixed pressure head (110) is inserted into the mounting plate (140) and connected to the chassis (150); The movable pressure head (120) is inserted into the mounting plate (140) and slidably connected to the mounting plate (140); One end of the elastic element (130) abuts against the chassis (150), and the other end abuts against the movable pressure head (120).

4. The ball-head structure according to claim 3, characterized in that, The ball head assembly (100) also includes a guide post (160), one end of which is connected to the chassis (150), and the other end is inserted into the movable pressure head (120) and slidably connected to the movable pressure head (120); The elastic element (130) is fitted onto the guide post (160).

5. The ball-head structure according to claim 4, characterized in that, The ball head assembly (100) also includes an arc-shaped pad (170) and a locating pin (180). The arc-shaped pad (170) is disposed between the mounting plate (140) and the chassis (150), and the positioning pin (180) is simultaneously inserted into the arc-shaped pad (170), the mounting plate (140) and the chassis (150).

6. The ball-head structure according to claim 5, characterized in that, The ball joint assembly (100) also includes a hemispherical seat (190) which is connected to the chassis (150) and ball-jointed to the base (200).

7. The ball-head structure according to claim 6, characterized in that, A first magnet (191) is provided on the hemispherical base (190), and a second magnet (210) is provided on the base (200). The first magnet (191) and the second magnet (210) attract each other.

8. The ball-head structure according to any one of claims 1-7, characterized in that, The axis of the fixed pressure head (110) is parallel to the axis of the movable pressure head (120).

9. The ball-head structure according to any one of claims 2-7, characterized in that, The elastic element (130) is configured as a disc spring or a compression spring.

10. A multi-point forming mold, characterized in that, Includes the ball-head structure as described in any one of claims 1-9.

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