Recent development of improved clinching process

Clinching technologies have better performance in joining different sheet materials. However, the protuberance and mechanical behaviors of clinched joints have always been needed to be improved. In this paper, a new clinching method, named two-strokes attening clinching (TFC) process, was proposed to improve the mechanical behaviors of joints and atten the protuberance. Mechanical testing including tension shearing tests were employed under quasi-static conditions to evaluate the different mechanical behaviors between TFC and conventional clinched joints. The in uences of the different forming forces on mechanical response of these joints were studied. The static strength, energy absorption, material ow and failure modes of TFC and conventional clinched joints were investigated comparatively. The experimental results demonstrated that the tension-shear strength of TFC clinched joints was increased by 30.3% compared with conventional clinched joints at the forming force of 30 kN. Furthermore, the material ow analysis showed that the thickness and interlock of TFC clinched joints were increased by 79% and 45.9%, respectively. The energy absorption of TFC clinched joint was increased by 82%. In addition, the TFC process did not change the failure mode of clinched joints, and the failure mode of all clinched joints was neck fracture.

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“…Furthermore, the energy absorptions of TFC and conventional clinched joints were compared in this article. 4 Results And Discussion…”

Section: Static Strength Testsmentioning

confidence: 99%

“…are widely adopted in manufacturing industries. These lightweight materials have almost replaced the use of steel in car bodies [1][2][3][4]. The connection methods of these materials have been studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Joining thin-walled structures without protuberance by two-strokes flattening clinching process

Peng

Chen

et al. 2021

Int J Adv Manuf Technol

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“…[3][4][5][6][7] However, relatively low joint strength is restricted the usability of the MC process. Peng et al 8 reviewed the latest advances of technologies on the development of clinching tools and processes to expand the application range of clinching technologies.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the tensile shear strength for joining low-ductility aluminium to high-strength steel by using electrically-assisted mechanical clinching (EAMC)

Barimani-Varandi

Aghchai

2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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The present work studied the enhancement of the tensile shear strength for joining AA6061-T6 aluminium to galvanized DP590 steel via electrically-assisted mechanical clinching (EAMC) using an integrated 2D FE model. To defeat the difficulties of joining low-ductility aluminium alloy to high-strength steel, the electroplastic effect obtained from the electrically-assisted process was applied to enhance the clinch-ability. For this purpose, the results of experiments performed by the chamfering punches with and without electrically-assisted pre-heating were compared. Joint cross-section, failure load, failure mode, fracture displacement, material flow, and failure mechanism were assessed in order to study the failure behaviour. The results showed that the joints clinched at the EAMC condition failed with the dominant dimpled mechanism observed on the fracture surface of AA6061 side, achieved from the athermal effect of the electroplasticity. Besides, these joints were strengthened 32% with a much more fracture displacement around 20% compared with non-electrically-assisted pre-heating.

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“…Mechanical clinching is a cold joining process of sheets by local hemming with a punch and die without a screw or a rivet. The recent developments in the improved clinching processes have been reviewed [27]. The production cost of mechanical clinching with that of the self-pierce riveting was compared [28], and mechanical clinching is useful for joining automobile body panels because of low running costs.…”

Section: Introductionmentioning

confidence: 99%

“…It is not easy to join this sheet configuration including one thin soft aluminium alloy sheet and two thin hard steel sheets by self-pierce riveting and mechanical clinching because of the small thickness ratio, the high flow stress with the low ductility of steel and the large difference of flow stresses. reviewed [27]. The production cost of mechanical clinching with that of the self-pierce riveting was compared [28], and mechanical clinching is useful for joining automobile body panels because of low running costs.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Clinching and Self-Pierce Riveting of Thin Three Sheets of 5000 Series Aluminium Alloy and 980 MPa Grade Cold Rolled Ultra-High Strength Steel

et al. 2020

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One thin 5000 series aluminium alloy sheet and two thin 980 MPa grade cold rolled ultra-high strength steel sheets were joined by self-pierce riveting and mechanical clinching processes. The joinabilities for a combination of the aluminium and steel sheets in both processes were investigated for different die shapes in the experiment and finite element simulation. In self-pierce riveting, the three sheets were successfully joined for both combinations of the upper and lower aluminium alloy sheets by optimizing the shapes of a die and rivet. In mechanical clinching, the three sheets were successfully joined by an optimum die for the configuration of the upper aluminium alloy sheet. On the other hand, the three sheets for the configuration of the lower aluminium alloy sheet were not joined even by optimizing the die shape in the both finite element simulation and experiment, because the material flow of the steel sheets was insufficient to form the two interlocks. The tension-shear loads for the clinched and riveted sheets with the adhesive were almost the same, because the load for the adhesive was the highest. In the cross-tension test, however, the load by the adhesive was comparatively small.

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Recent development of improved clinching process

Cited by 71 publications

References 110 publications

Joining thin-walled structures without protuberance by two-strokes flattening clinching process

Joining thin-walled structures without protuberance by two-strokes flattening clinching process

Enhancement of the tensile shear strength for joining low-ductility aluminium to high-strength steel by using electrically-assisted mechanical clinching (EAMC)

Mechanical Clinching and Self-Pierce Riveting of Thin Three Sheets of 5000 Series Aluminium Alloy and 980 MPa Grade Cold Rolled Ultra-High Strength Steel

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