Riveting device for multi-stage control of riveting deformation of aluminum alloy structural part

Abstract

The utility model relates to the technical field of riveting, in particular to a multi-stage riveting deformation control pressing rivet device for an aluminum alloy structural part, which comprises a first-stage pre-pressing module, a second-stage riveting head shape pressing module and a bottom frame, compared with a conventional rivet pressing process, the synchronous pre-pressing mechanism is arranged in the rivet pressing process, the pressing mechanism adopts a two-stage pressing mode, local plastic deformation and accumulated plastic deformation of the aluminum alloy structural part are controlled respectively, and overall rivet pressing deformation of the structural part is effectively restrained; the equipment automatically returns to the initial position after riveting, and the whole process is simple, continuous and stable.

Description

Technical Field

[0001] The utility model relates to the technical field of riveting, in particular to a riveting press device for multi-level control of riveting deformation of aluminum alloy structural parts. Background Technique

[0002] Due to the advantages of high specific strength, low density, and large weight reduction potential of aluminum alloy materials, they are currently widely used in the lightweight field of new energy electric vehicles, such as automotive components like battery housings, vehicle bodies, automotive chassis, wheels, and anti-collision beams. In the automotive manufacturing industry, the riveting press connection technology effectively improves the strength, rigidity, and production efficiency of riveted joints by quickly generating plastic deformation between connecting parts, especially suitable for aluminum alloy materials with excellent plasticity. Therefore, the riveting press technology has always been favored in the field of new energy electric vehicles. However, due to the low strength and rigidity of aluminum alloy, local plastic deformation is prone to occur during conventional riveting, and the riveting heads and riveting dies used are restricted by the product structure and volume, making it difficult to achieve the effect of suppressing riveting deformation by simply optimizing their structures. For automotive structural parts, there are up to thousands of riveting press connection requirements. Limited by multiple processing conditions, local plastic deformation is prone to form a cumulative plastic deformation effect in a specific direction. Thus, on the one hand, it is easy to cause overall deformation of the product, and on the other hand, it is easy to cause large residual stresses in the structural parts, greatly increasing the risk of product failure. Therefore, it is necessary for us to develop a device for controlling the riveting deformation of aluminum alloy structural parts used in new energy vehicles, thereby improving the processing accuracy of products. Content of the Utility Model

[0003] The purpose of the utility model is to provide a riveting press device for multi-level control of riveting deformation of aluminum alloy structural parts, which is used to control the local and cumulative plastic deformation of aluminum alloy structural parts used in new energy vehicles and effectively suppresses the overall riveting deformation of the structural parts.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A riveting device for multi-stage control of riveting deformation of an aluminum alloy structural part, comprising a primary pre-pressing module, a secondary rivet head forming module and a chassis; the primary pre-pressing module is installed on the chassis; the chassis is composed of a base and a support plate; the primary pre-pressing module includes a lower die fixing plate, a guide post spring, a guide post, an upper die fixing plate, a linear bearing, a limit block, a lower shaping die, and a pressing block module; the lower die fixing plate is installed on the support plate, and the lower shaping die is installed on the lower die fixing plate; there are two symmetrically arranged guide posts, the lower ends are fixed to the lower die fixing plate by threads, the upper ends are provided with limit blocks, the linear bearing is installed on the upper die fixing plate, and the upper die fixing plate and the guide posts can slide relatively up and down through the linear bearing. A guide post spring is sleeved on the guide post, and the upper end of the guide post spring abuts against the lower plane of the upper die fixing plate and is limited by the limit block; there are two pressing block modules, both of which are installed on the upper die fixing plate; the secondary rivet head forming module includes a hollow sleeve, a forming sleeve pre-tightening spring, a forming sleeve, and a rivet head; the upper part of the rivet head penetrates into the inner cavity of the hollow sleeve, and the upper end abuts against the top end of the inner cavity and is fixed with a fixing bolt; the forming sleeve is hooked to the step on the rivet head through a step and is arranged in a hole on the upper die fixing plate and can move up and down in the hole; the forming sleeve pre-tightening spring is arranged above the forming sleeve.

[0006] For the above-mentioned riveting device for multi-stage control of riveting deformation of an aluminum alloy structural part, the pressing block module includes a support column, a pressing block spring, and a pressing block body; there are four support columns, and the upper ends are fastened to the upper die fixing plate by threads; the pressing block body is in a cuboid shape, and circular grooves are provided on both the upper and lower surfaces. The lower ends of the support columns sink into the lower grooves and are positioned by the steps at the lower ends of the support columns. The pressing block body can move up and down along the support columns; the lower end of the pressing block spring sinks into the upper groove of the pressing block body, and the upper end abuts against the top end of the inner cavity on the upper die fixing plate.

[0007] For the above-mentioned riveting device for multi-stage control of riveting deformation of an aluminum alloy structural part, the elastic coefficients of the guide post spring, the forming sleeve pre-tightening spring, and the pressing block spring are different, and they are all rectangular springs.

[0008] The utility model has the following advantages:

[0009] Compared with the conventional riveting process, the utility model is provided with a synchronous pre-pressing mechanism during the riveting process. This pressing mechanism adopts a two-stage pressing method, which respectively controls the local and cumulative plastic deformation of the aluminum alloy structural part, effectively suppressing the overall riveting deformation of the structural part; after riveting, the equipment automatically returns to the initial position, and the whole process is simple, continuous and stable. Description of the Drawings

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0011] Figure 2This is a schematic perspective view of the upper die fixing plate not shown in the present utility model;

[0012] Figure 3 This is the main view of the partial cross-section of the present utility model;

[0013] Each label in the figure is respectively represented as: 111, lower die fixing plate, 112, guide post spring, 113, guide post, 114, upper die fixing plate, 115, linear bearing, 116, limit block, 117, aluminum alloy structural member, 118, lower shaping die, 119, press block module, 211, hollow sleeve, 212, pre-tightening spring of the forming sleeve, 213, forming sleeve, 214, riveting head, 215, fixing bolt, 31, base, 32, support plate, 120, support column, 121, press block spring, 122, press block body. Specific embodiments

[0014] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0015] A riveting device for multi-level control of riveting deformation of an aluminum alloy structural member of the present utility model includes a primary pre-pressing module, a secondary riveting head forming module, and a chassis. The primary pre-pressing module is installed on the workbench of the hydraulic riveting equipment through symmetric support plates 32, and the secondary riveting head forming module is installed on the primary pre-pressing module.

[0016] For a riveting device for multi-level control of riveting deformation of an aluminum alloy structural member of the present utility model, a set of symmetric spring guide modules is provided in the primary pre-pressing module. Among them, two guide posts 113 respectively pass through the linear bearing 115 with a flange, the upper die fixing plate 114, and the rectangular spring 112, and the lower ends are fixed to the lower die fixing plate 111. Press block modules 119 and lower shaping dies (118) are respectively provided on the upper die fixing plate 114 and the lower die fixing plate 111 for pre-pressing the flange edges of the aluminum alloy structural member 117. The center lines of the two press block bodies 122 are located in the same plane and are symmetrically distributed along the length direction of the upper die fixing plate 114. A set of spring link structures is provided in the secondary riveting head forming module. Among them, the cylindrical riveting head 214 with a step respectively passes through the bottom forming sleeve 213 and the pre-tightening spring 212 of the forming sleeve, and is connected to the hollow sleeve 211 through the fixing bolt 215.

[0017] A riveting device for multi - level control of riveting deformation of an aluminum alloy structural part of the present utility model. The pressing block module 119 includes a support column 120, a pressing block spring 121, and a pressing block body 122. There are four support columns 120, and the upper ends are fastened to the upper die fixing plate 114 by threads. The pressing block body 122 is in a cuboid shape, and circular grooves are provided on both the upper and lower surfaces. The lower ends of the support columns 120 sink into the lower grooves and are positioned by the steps at the lower ends of the support columns 120. The pressing block body 122 can move up and down along the support columns 120. The lower end of the pressing block spring 121 sinks into the upper groove of the pressing block body 122, and the upper end abuts against the top of the inner cavity of the upper die fixing plate 114.

[0018] A riveting device for multi - level control of riveting deformation of an aluminum alloy structural part of the present utility model has the following working principle: The hollow sleeve 211 is driven by the moving end of the riveting equipment to move downward, and then drives the upper die fixing plate 114 to move downward along the guiding shafts 113 on both sides. Subject to the resistance of the guiding column spring 112 outside the linear bearing 115, the moving speed is controllable. Along with the downward movement of the upper die fixing plate 114, the bottom of the pressing block body 122 first contacts the flange edge of the aluminum alloy structural part 117 placed on the lower shaping die 118. At this time, the pressing block spring 121 generates a pressing force, which is transmitted to the flange edge of the aluminum alloy structural part 117 through the lower shaping die 118. When the pressing block spring 121 is compressed to a predetermined compression amount, a preset pressing force is reached. By adjusting the pressing block spring 121, different pre - pressing forces can be obtained. In this way, not only the flange edge of the aluminum alloy structural part 117 is effectively pressed, but also the pre - pressing force is adjustable, realizing the first - level pre - pressing process.

[0019] After the first - level pre - pressing process is completed, the riveting equipment provides a greater downward pressure, continues to drive the hollow sleeve 211 to move downward, causes the pressing block spring 121 to further contract, drives the secondary riveting head forming module to continue moving downward until the forming sleeve 213 contacts the upper surface of the aluminum alloy structural part 117. Subsequently, the forming sleeve pre - tightening spring 212 connected to the forming sleeve 213 begins to contract, prompting the forming sleeve 213 to gradually press the upper surface area of the aluminum alloy structural part 117, realizing the secondary pressing of the local area around the riveting.

[0020] The continuous downward pressing of the first - level pre - pressing module and the secondary riveting head module drives the riveting head 214 to press down and tighten the riveting nut. After the hydraulic cylinder of the riveting equipment reaches the set pressure value, the moving end of the riveting equipment slowly lifts upward. Subsequently, the secondary riveting head module and the first - level pre - pressing module are depressurized successively, and the forming sleeve pre - tightening spring 212 and the pressing block spring 121 rebound, driving the forming sleeve 213 and the pressing block body 122 to return to the initial position. The upper die fixing plate 114 rises to the initial position along with the rebound of the guiding column spring 112.

[0021] Driven by the riveting equipment, through the setting of springs with different spring constants, the continuous actions of the primary pressing die pre-compression, the secondary riveting head pressing, the riveting, and the recovery process are successfully achieved, effectively controlling the plastic deformation generated during the riveting process.

[0022] Switch the riveting position of the aluminum alloy structural part 117, repeat the above steps, and finally achieve effective control of the overall plastic deformation of the aluminum alloy structural part.

Claims

1. A riveting device for controlling the riveting deformation of aluminum alloy structural parts at multiple levels, characterized in that: It comprises a primary pre-pressing module, a secondary rivet head pressing module and a base frame; the primary pre-pressing module is mounted on the base frame; the base frame is composed of a base (31) and a support plate (32); the primary pre-pressing module comprises a lower die fixing plate (111), a guide column spring (112), a guide column (113), an upper die fixing plate (114), a linear bearing (115), a limit block (116), a lower shaping die (118), and a pressing block module (119); The lower die fixing plate (111) is mounted on the support plate (32), and the lower shaping die (118) is mounted on the lower die fixing plate (111); two guide columns (113) are symmetrically arranged, the lower ends of which are fixed to the lower die fixing plate (111) by threads, and the upper ends are provided with limit blocks (116); the linear bearings (115) are mounted on the upper die fixing plate (114), and the upper die fixing plate (114) and the guide columns (113) can be relatively moved by the linear bearings (115). The guide column (113) slides up and down, and a guide column spring (112) is sleeved on the guide column (113). The upper end of the guide column spring (112) presses against the lower plane of the upper die fixing plate (114) and is limited by a limit block (116); two pressure block modules (119) are provided, both of which are installed on the upper die fixing plate (114); the secondary rivet head pressing module comprises a hollow sleeve (211), a pressing sleeve preload spring (212), a pressing sleeve (213), A rivet head (214); the upper portion of the rivet head (214) is inserted into the inner cavity of the hollow sleeve (211), the upper end of the rivet head (214) is pressed against the top of the inner cavity, and is fixed using a fixing bolt (215); the pressing sleeve (213) is hooked together with the step on the rivet head (214) through a step, and is arranged in a hole on the upper mold fixing plate (114), and can move up and down in the hole; the pressing sleeve preload spring (212) is arranged above the pressing sleeve (213).

2. The riveting device for multi-stage controlled riveting deformation of aluminum alloy structural parts according to claim 1 is characterized in that: The pressing block module (119) comprises a support column (120), a pressing block spring (121), and a pressing block body (122); four support columns (120) are provided, and the upper ends are fastened to the upper mold fixing plate (114) by means of threads; the pressing block body (122) is in the shape of a rectangular parallelepiped, and circular grooves are provided on the upper and lower surfaces; the lower end of the support column (120) is sunk into the lower groove, and is positioned by means of a step at the lower end of the support column (120); the pressing block body (122) can move up and down along the support column (120); the lower end of the pressing block spring (121) is sunk into the upper groove of the pressing block body (122), and the upper end is pressed against the top of the upper inner cavity of the upper mold fixing plate (114).

3. The riveting device for multi-stage controlled riveting deformation of aluminum alloy structural parts according to claim 1 is characterized in that: The guide column spring (112), the compression sleeve preload spring (212), and the pressure block spring (121) have different elastic coefficients and are all rectangular springs.

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