New Approach for Versatile Self Piercing Riveting: Joining System and Auxiliary Part

Kappe, F.; Bobbert, Mathias; Meschut, Gerson

doi:10.4028/www.scientific.net/kem.883.3

Cited by 4 publications

(6 citation statements)

References 12 publications

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“…The concepts of the required multi-range capable rivets were presented in [11]. For this study, both rivet geometries were engineered in order to join combinations with sheetthickness combinations of up to 4 mm.…”

Section: Multi-range Capable Rivetsmentioning

confidence: 99%

“…The new rivet geometries are applied using a specially developed joining system. The tool concept for this joining system with extended tool-actuator technology has been presented and described in [11]. This system offers an increased punch-sided tool actuator technology, which enables the joining process described above.…”

Section: Joining Systemsmentioning

confidence: 99%

“…An adaptive adjustment of the joining process to changed boundary conditions is hereby made possible. The general feasibility of this joining technology was presented using a substitute model considering the head formation in [11]. The process sequence of this versatile self-piercing riveting process (V-SPR) is divided into a setting and a forming process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Multi-range Capable Rivetsmentioning

confidence: 99%

Section: Joining Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Kappe

Wituschek

Bobbert

et al. 2022

Prod. Eng. Res. Devel.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In an initial substitute model, which focused only on the rivet head geometry, it was possible to demonstrate the feasibility of the two rivet concepts presented above [16]. In this investigation, the entire joining process of the V-SPR process is now considered, which takes account of both the setting and the forming of the rivet head and thus enables the numerical analysis of the V-SPR process.…”

Section: Simulative Process Designmentioning

confidence: 99%

“…In order to represent the flow behaviour of the materials in the simulation, the flow curves were implemented. These were determined by compression test according to DIN 50106 and subsequently extrapolated using the Hocket-Sherby approach for the sheets [14] and rivet material [16].…”

Section: Simulative Process Designmentioning

confidence: 99%

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

Kappe

Wituschek

Bobbert

et al. 2022

Prod. Eng. Res. Devel.

Self Cite

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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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Determining the influence of different process parameters on the versatile self-piercing riveting process using numerical methods

Kappe

Zirngibl

Schleich

et al. 2022

Journal of Manufacturing Processes

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New Approach for Versatile Self Piercing Riveting: Joining System and Auxiliary Part

Cited by 4 publications

References 12 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

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

Determining the influence of different process parameters on the versatile self-piercing riveting process using numerical methods

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