Friction Self-Piercing Riveting (F-SPR) of AA6061-T6 to AZ31B

Li, Yongbing; Wei, Zeyu; Li, Yating; Wang, Zhaozhao; Zhu, Xiaogang

doi:10.1115/imece2013-64212

Cited by 6 publications

(5 citation statements)

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“…In addition to the development of new rivet geometries, a flexibilisation of the process can also be achieved by modifying the process kinematics. For example, due to a rotation of the rivet at high speed and the resulting plastification of the punch-sided joining part, semi-tubular self-piercing riveting can be used to join brittle materials [7]. Using double-sided self-piercing riveting (DSSPR) allows the formation of a planar joint by mechanical joining processes.…”

Section: Introductionmentioning

confidence: 99%

Determining the properties of multi-range semi-tubular self-piercing riveted joints

Kappe

Wituschek

Bobbert

et al. 2022

Prod. Eng. Res. Devel.

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By applying a variety of strategies, including both the development of new drive concepts as well as the use of lightweight constructions, it is intended to meet the climate targets set by the Paris Agreement. Multi-material design is often used when applying lightweight constructions, especially in the mobility sector. Herby, various materials with different properties are combined to well adapt the structure to the application of force in order to reduce weight. For example, this can result in the combined use of (high-strength) steel and aluminium. However, the increasing number of materials used and the number of resulting joints has led to the development of a number of different joining processes. These can only be used to a limited extent for joining multi-material joints and are usually inflexible facing changing boundary conditions. Examples of further difficulties affecting the established processes are metallurgical incompatibilities, which particularly pose difficulties for the use of thermal joining processes. A frequently used mechanical joining process is self-piercing riveting. Due to its high load-bearing capacities, a wide range of application and high process robustness it is often used when joining of dissimilar material is required. However, in case of self-piercing riveting used, the increasing number of multi-material joints and material-thickness combinations leads to the need of a large number of rivet-die-combinations to adapt the joining process to the respective joining task. Since the joining system cannot react to these changes, a tool change or an adjustment of the system is necessary, which leads to a reduction in efficiency and extended process times. To increase flexibility and process efficiency, new, versatile joining technologies are needed that can be adapted to changing boundary conditions. One possibility for this is the use of multi-range capable semi-tubular self-piercing rivets, which are inserted into the joint by using a new joining system with extended punch-sided actuator technology. The increased actuator technology enables the rivet to be set by an inner punch and subsequently to form a rivet head by embossing with an outer punch. All punch movements can be controlled independently of each other, enabling adaptive adjustment of the process parameters. Depending on the rivet geometry used, rivet head formation by the outer punch can be performed both with and without head deformation. The rivet without head deformation consists of a tubular shape with ring grooves in the rivet head area. Using the outer punch, punch-sided material is formed into the ring grooves creating an interlock in the head area of the rivet. The rivet with head deformation is designed differently. It is modified to enable subsequent forming to the respective thickness of the joint by forming the protrusion of the rivet head onto the punch-sided joining part. In the study presented here, the joining process of the versatile self-piercing riveting is presented, analysed and the property profile of the joints is determined on the basis of various material-thickness combinations. Here, both the characteristic parameters of the joints and the joint load-bearing capacities are determined. Finally the property profiles are compared with conventionally manufactured joints in order to identify potential for improvement.

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Section: Introductionmentioning

confidence: 99%

Determining the properties of multi-range semi-tubular self-piercing riveted joints

Kappe

Wituschek

Bobbert

et al. 2022

Prod. Eng. Res. Devel.

View full text Add to dashboard Cite

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“…Several works have focused on the extension of the process limits of the SPR process [4]. These focus either on the rivet geometry [5] or the process kinematics [6]. Also the combination of rivet geometry and kinematics were investigated as shown in [7].…”

Section: Self-piercing Rivetingmentioning

confidence: 99%

Influence of local heat treatment of rivets on the joint formation of a versatile joining process

Kappe,

Bobbert,

Meschut

2024

IOP Conf. Ser.: Mater. Sci. Eng.

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An efficient lightweight construction method is the combination of different materials in order to adapt the structure to the applied load. To join these multi-material structures mechanical joining technologies are applied. However, the rigid tooling systems cannot be adjusted to changing boundary conditions which is why new, versatile joining technologies are required. In the versatile self-piercing riveting (V-SPR) process presented in [1] different material combination are joined by using a multi-range capable rivet. The rivet head is formed onto the respective thickness of the joint by an outer punch. In order to punch thru the upper sheet a great rivet hardness is required whereas a lower hardness is required for the subsequent forming of the rivet head. To achieve a combination of these requirements, this study investigates a local heat treatment of the rivet. The aim is to determine the feasibility of such a heat treatment as well as to investigate the influence on the joint formation.

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“…A modification of the system kinematics can also increase the versatility of the joining process, as tool changes can be reduced or joining processes can be adapted to a new joining task by the changed kinematic. Li et al (2013) presented a friction self-piercing riveting (F-SPR) process, which offers the possibility of extending the application limits, especially for brittle materials, by using completely new process kinematics. Here, the rivet is rotated at high speed during the joining process, resulting in plastification of the punchsided joining part (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of cracks can thus be prevented. Through the plastification of the parts to be joined, the process combines the solid-state joining mechanisms of friction stir spot welding and the mechanical joining mechanism of semi-tubular self-piercing riveting [8].…”

Section: Introductionmentioning

confidence: 99%

Joining of multi-material structures using a versatile self-piercing riveting process

Kappe

Wituschek

Bobbert

et al. 2022

Prod. Eng. Res. Devel.

View full text Add to dashboard Cite

Due to the increasing use of multi-material constructions and the resulting material incompatibilities, mechanical joining technologies are gaining in importance. The reasons for this are the variety of joining possibilities as well as high load-bearing capacities. However, the currently rigid tooling systems cannot react to changing boundary conditions, such as changed sheet thicknesses or strength. For this reason, a large number of specialised joining processes have been developed to expand the range of applications. Using a versatile self-piercing riveting process, multi-material structures are joined in this paper. In this process, a modified tool actuator technology is combined with multi-range capable auxiliary joining parts. The multi-range capability of the rivets is achieved by forming the rivet head onto the respective thickness of the joining part combination without creating a tooling set-up effort. The joints are investigated both experimentally on the basis of joint formation and load-bearing capacity tests as well as by means of numerical simulation. It turned out that all the joints examined could be manufactured according to the defined standards. The load-bearing capacities of the joints are comparable to those of conventionally joined joints. In some cases the joint fails prematurely, which is why lower energy absorptions are obtained. However, the maximum forces achieved are higher than those of conventional joints. Especially in the case of high-strength materials arranged on the die side, the interlock formation is low. In addition, the use of die-sided sheets requires a large deformation of the rivet head protrusion, which leads to an increase in stress and, as a result, to damage if the rivet head. However, a negative influence on the joint load-bearing capacity could be excluded.

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Friction Self-Piercing Riveting (F-SPR) of AA6061-T6 to AZ31B

Cited by 6 publications

References 0 publications

Determining the properties of multi-range semi-tubular self-piercing riveted joints

Determining the properties of multi-range semi-tubular self-piercing riveted joints

Influence of local heat treatment of rivets on the joint formation of a versatile joining process

Joining of multi-material structures using a versatile self-piercing riveting process

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