Automatic device for improving riveting strength of aluminum material

Abstract

The utility model discloses an automatic device for improving the riveting strength of an aluminum material. Comprising a positioning tool table, a fixing frame arranged on one side of the positioning tool table, a C-shaped clamp block arranged on the fixing frame, a rivet pressing upper die and a rivet pressing lower die which are arranged at the upper end and the lower end of the C-shaped clamp block respectively, a servo power cylinder arranged on the rivet pressing upper die, and an automatic nail feeding device arranged in the C-shaped clamp block. And the screw detection sensor is arranged on the C-shaped clamp block below the automatic nail feeding device. The utility model has the effects that the strength and the stability are improved, and the operation is easy.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing and processing, and in particular to an automatic device for improving the riveting strength of aluminum materials. Background Technology

[0002] Lightweighting of automobiles is a crucial way to achieve energy conservation and emission reduction, and it plays a significant role in promoting the development of green transportation. Energy conservation and emission reduction drive the trend towards lightweighting, and the penetration rate of aluminum lightweighting is continuously increasing. Aluminum alloy is one of the commonly used lightweight materials, with lower density and better energy absorption compared to steel, but it is more expensive and has a more complex joining process. The development of automotive lightweighting technology is particularly critical. Tesla, a new energy vehicle manufacturer, has already achieved an aluminum alloy ratio of 20% or more in its vehicle body, with some high-end Tesla models having an even higher ratio. Other car brands, such as the Audi A8, NIO ES8, and Chery eQ1, have even adopted all-aluminum bodies. Many emerging domestic car brands are also pursuing automotive lightweighting and the trend towards aluminum alloy bodies. Our company undertook the left / right front door outer waistline reinforcement plate assemblies and left / right rear door outer waistline reinforcement plate assemblies for the XPeng G9 and XPeng X9, which use an aluminum pressing and riveting process, significantly different from traditional welding processes. Manual pressing and riveting requires a high level of skill from the operators, and the technique makes it difficult to ensure the balance of the support surfaces of the parts. Aluminum riveting places high demands on the clearance fit and perpendicularity between the parts and the screw. Unstable riveting strength can easily lead to screw detachment, causing serious quality issues. Currently, the industry lacks guidance on the compatibility of the part's hole structure with the riveting screw for aluminum riveting. The impact of the part's hole structure and the fit clearance range on riveting strength and stability is still being explored. Currently, production mainly uses manual riveting. Manual riveting lacks a balanced support surface for the parts and relies heavily on the operator's skill. For example, using a simple handheld clamp made by referring to traditional welding techniques on softer aluminum materials carries the risk of part deformation, and the lack of planar positioning makes it ineffective in balancing the support surface. Manual riveting relies on operators regularly cleaning the riveting mold according to standard operating frequencies. This only ensures the quality of parts produced immediately after cleaning; accumulated aluminum shavings during production can still cause damage to some parts, posing a certain quality control risk. Therefore, current aluminum riveting screws are prone to falling off, necessitating improvements in their strength to ensure that peeling torque, breaking torque, and push-out force meet vehicle assembly standards and market vehicle durability requirements. During manual riveting, inconsistent handling techniques lead to deviations in the perpendicularity of the riveting screw to the part, resulting in unstable push-out force, peeling torque, and breaking torque after riveting. Utility Model Content

[0003] In view of the above problems, the purpose of this utility model is to provide an automatic device for improving the strength and stability of aluminum riveting and for easy operation.

[0004] To achieve the above objectives, this utility model provides an automatic device for improving the riveting strength of aluminum materials, comprising a positioning fixture, a fixing frame provided on one side of the positioning fixture, a C-shaped clamp block provided on the fixing frame, an upper riveting die and a lower riveting die provided at the upper and lower ends of the C-shaped clamp block respectively, a servo power cylinder provided on the upper riveting die, an automatic screw feeding device provided inside the C-shaped clamp block, and a screw detection sensor provided on the C-shaped clamp block below the automatic screw feeding device.

[0005] In some implementations, an automatic nail feeder connected to an automatic nail feeding device is provided on one side of the positioning fixture table.

[0006] In some implementations, a quality monitor connected to a screw detection sensor is provided on one side of the positioning fixture.

[0007] In some implementations, a control cabinet is located below the quality monitor.

[0008] In some embodiments, a first positioning platform with six supporting door waistline reinforcing plates is provided on the positioning fixture located on the side of the upper and lower riveting dies; and a second positioning platform with 16 supporting door waistline reinforcing plates is arranged sequentially on the positioning fixture located away from the upper and lower riveting dies.

[0009] In some implementations, the height of the first positioning platform is 120mm; the height of the second positioning platform is 60mm.

[0010] In some implementations, a spring positioning pin is provided on the positioning fixture.

[0011] In some implementations, an air blowing pipe connected to an air pipe is provided on the outer edge of the positioning fixture.

[0012] The beneficial effects of this utility model are improved strength and stability, and ease of operation. Practical verification allows for direct consideration of the die punching structure and stamping process sequence. The tolerance range for the fit between the hole diameter and the screw can be tightened during design. This is beneficial for ensuring the strength and stability of the riveting screw during mass production. It avoids batch parts failing to meet standard requirements due to improper design, leading to batch scrapping of parts and vehicle quality accidents caused by screw detachment. The universal tooling table can match the riveting production of similar left / right and front / rear door waistlines, improving equipment uptime. This tooling table has high stability and is simple and easy to operate, with low dependence on operator proficiency and professional skills. It significantly reduces personnel training time and quality control risks. Furthermore, regarding the part flanging structure and fit clearance: Previously, the fit clearance of parts with planar punching and conical flanging was poor, resulting in large fluctuations in riveting strength. Adjusting the riveting equipment parameters had significant limitations, and the improvement in riveting strength was not significant. Based on different riveting structures and comparative analysis of multiple sets of experiments, it was ultimately determined that right-angle riveting offers relatively better improvement in riveting strength and stability, with a relative increase in thrust strength of 600-1300N. Manual riveting requires high operator skills and techniques, and the quality of manual riveting is inconsistent. Therefore, a universal tooling table was designed in conjunction with automated riveting, using compression spring positioning pins to balance the support surface and distribute force more evenly. This makes the riveting process more convenient and simple, and the riveting strength more stable. Previously, the riveting mold was cleaned periodically according to standard operating frequencies, but this could not guarantee the quality of each riveting operation, and accumulated aluminum shavings still caused damage to parts, posing a certain quality control risk in the process. By using an automated riveting equipment with a linked air blowing device, air is blown onto the surface of the riveting mold after each riveting operation, reducing the adhesion of burrs and aluminum shavings to parts during the riveting process, extending the life of the riveting mold, and reducing surface damage to parts. This achieves improved strength and stability, as well as ease of operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] The utility model will now be described in further detail with reference to the accompanying drawings.

[0015] like Figure 1As shown, an automatic device for improving the riveting strength of aluminum materials includes a positioning fixture 1, a fixing frame 2 on one side of the positioning fixture 1, a C-shaped clamping block 3 on the fixing frame 2, an upper riveting die 4 and a lower riveting die 5 respectively on the upper and lower ends of the C-shaped clamping block 3, a servo power cylinder 6 on the upper riveting die 4, an automatic nail feeding device 7 inside the C-shaped clamping block 3, and a screw detection sensor on the C-shaped clamping block 3 below the automatic nail feeding device 7. An automatic nail feeder 9 connected to the automatic nail feeding device 7 is provided on one side of the positioning fixture 1. A quality monitor 8 connected to the screw detection sensor 8 is provided on one side of the positioning fixture 1. A control cabinet 12 is provided below the quality monitor 8. On the positioning fixture 1 located on one side of the upper and lower riveting molds 4 and 5, there are six first positioning platforms 10 supporting the door waistline reinforcement plates; on the positioning fixture 1 located away from the upper and lower riveting molds 4 and 5, there are 16 second positioning platforms 11 arranged sequentially to support the door waistline reinforcement plates. The height of the first positioning platform 10 is 120mm; the height of the second positioning platform 11 is 60mm. In use, based on the height difference of the outer waistline reinforcement plates, two specifications of positioning platforms are designed: the positioning platforms closer to the riveting molds are 120mm high, with 6 platforms; the positioning platforms further away from the riveting molds are 60mm high, with 16 platforms. This is suitable for the riveting process of all door waistline reinforcement plates. Combined with the telescopic nature of the spring positioning pins, it is used to balance the contact surface height of the support surface of the parts and ensure uniform force distribution, as well as the perpendicularity of the screw to the parts, eliminating the need for manual adjustment each time. The positioning fixture 1 is equipped with spring positioning pins. The compression spring screw has a diameter of 5mm and a height of 70mm. The compression spring is made of SUS304-WPB stainless steel with a wire diameter of 0.7mm x 10mm x 50mm. An air blowing pipe is installed on the outer edge of the positioning fixture 1, connected to an air hose. This air blowing pipe is linked to the riveting equipment, performing air cleaning on the mold surface with each riveting operation to prevent damage caused by aluminum shavings and burrs.

[0016] In application, early product design and mold development can directly consider using a right-angled flanged hole structure for the riveting holes, and a fit clearance between 0 and +0.2mm. This avoids batch parts failing to meet standard requirements during mass production due to poor design, resulting in mass scrapping and waste of parts, as well as vehicle quality accidents caused by screw detachment. Combined with automatic riveting, a universal tooling table is designed, using compression spring positioning pins to balance the support surface and distribute force more evenly. The peeling torque is increased by 6-8 N·m, the breaking torque by 11-14 N·m, and the ejection force by 1300-1500 N, with the ejection force fluctuation range stabilized within 200 N. This also makes the riveting operation more convenient and simple, and the screw riveting strength more stable. An automatic air blowing device is added, blowing air onto the surface of the riveting die after each riveting operation, reducing the adhesion of burrs and aluminum chips to parts during the riveting process, extending the life of the riveting die to some extent, and reducing surface damage to parts.

[0017] The workpiece is manually placed on the shared positioning fixture, and the workpiece and screw detection sensors 8 are configured. The equipment cannot start if the workpiece and screw are not placed.

[0018] Start the equipment and complete the riveting of one screw in one stamping, and complete the riveting one by one;

[0019] Pressure and displacement values ​​are monitored to determine whether they meet the riveting quality setting requirements. If they do not meet the requirements, an alarm is triggered, and the pressure and displacement are displayed on the touch screen.

[0020] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. An automatic device for improving the riveting strength of aluminum materials, characterized in that, It includes a positioning fixture, a fixed frame on one side of the positioning fixture, a C-shaped clamp block on the fixed frame, an upper and lower riveting die on the upper and lower ends of the C-shaped clamp block respectively, a servo power cylinder on the upper riveting die, an automatic screw feeding device inside the C-shaped clamp block, and a screw detection sensor on the C-shaped clamp block below the automatic screw feeding device.

2. The automatic device for improving the riveting strength of aluminum materials according to claim 1, characterized in that, An automatic nail feeder connected to an automatic nail feeding device is provided on one side of the positioning fixture table.

3. An automatic device for improving the riveting strength of aluminum materials according to claim 1 or 2, characterized in that, A quality monitoring device connected to the screw detection sensor is installed on one side of the positioning fixture.

4. The automatic device for improving the riveting strength of aluminum materials according to claim 3, characterized in that, A control cabinet is installed below the quality monitoring device.

5. The automatic device for improving the riveting strength of aluminum materials according to claim 1, characterized in that, Six first positioning platforms supporting the door waistline reinforcing plate are provided on the positioning fixture table located on one side of the upper and lower riveting dies. Sixteen second positioning platforms supporting the door waistline reinforcement plate are arranged sequentially on the positioning fixture table on the side away from the upper and lower riveting dies.

6. The automatic device for improving the riveting strength of aluminum materials according to claim 5, characterized in that, The height of the first positioning platform is 120mm; the height of the second positioning platform is 60mm.

7. The automatic device for improving the riveting strength of aluminum materials according to claim 5, characterized in that, The positioning fixture is equipped with a spring positioning pin.

8. An automatic device for improving the riveting strength of aluminum materials according to claim 5, characterized in that, An air blowing pipe is provided on the outer edge of the positioning fixture table for connecting to an air pipe.

Images