Influence of cutting clearance and punch geometry on the stress state in small punch test

Otroshi, Mortaza; Meschut, Gerson

doi:10.1016/j.engfailanal.2022.106183

Cited by 5 publications

(2 citation statements)

References 50 publications

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“…Therefore, a suitable head punch design, an optimized clearance and a new punch guiding solution are important to reduce the tool wear. The work of Otroshi et al [9] also shows the importance of the punch geometry and the clearance of the common wear mechanisms. However, depending on the respective wear of the punch, the resulting quality of the cutting surface of the punched parts changes.…”

Section: Introductionmentioning

confidence: 98%

Punching of Ultra-High-Strength Spring Strips: Evolution of Cutting Edge Radius up to 1,000,000 Strokes for Three Punch Materials

Winter

Richter

Galiev

et al. 2022

JMMP

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Punching of ultra-high-strength spring steel causes critical stresses in the tools. Pronounced wear and even spontaneous failure may occur. Wear of the punches influences the quality of the cutting surfaces of the blanked parts, which is predominantly determined by the cutting edge radius. The radius differs with an increasing number of strokes depending on the punch material. However, there are no studies characterizing the influence of the cutting edge radius on the cutting surface quality on an industrial scale, i.e., considering a very high number of strokes. In the presented study, punches made of high-speed steel, powder metallurgical steel and carbide were used to punch the ultra-high-strength steel 1.4310 (Rm = 1824 MPa) up to 1,000,000 strokes. The experiments were stopped at defined number of strokes, the punches were removed, nondestructively characterized regarding cutting edge radius and wear and reinstalled. It turned out that the radius differed significantly over the number of strokes and, further, varied depending on the punch material. Remarkably, the most low-cost material, precisely the high-speed steel, showed the smallest cutting edge radius of 16 µm and brought the parts with the best cutting surface quality (more than 30% burnish zone) after the maximum number of strokes. The results indicate clearly that the cutting edge radius develops differently for each regarded material and at different number of strokes. Therefore, it is of utmost importance to perform wear tests on different numbers of strokes under industrial conditions. With the knowledge gained, it will be possible to design optimized punches with lower costs and increased lifetime.

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Section: Introductionmentioning

confidence: 98%

Punching of Ultra-High-Strength Spring Strips: Evolution of Cutting Edge Radius up to 1,000,000 Strokes for Three Punch Materials

Winter

Richter

Galiev

et al. 2022

JMMP

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“…In the shear cutting process, the punch movement pushes the material downward, creating rollover and burnish regions due to plastic deformation. The process continues until a crack initiates, and its propagation separates the material into two parts [16]. As a result, burr and fracture regions of the cut edge are created.…”

Section: Introductionmentioning

confidence: 99%

Initiation and growth of edge cracks after shear cutting of dual-phase steel

Khalilabad

Perdahcioglu

Atzema

et al. 2023

Int J Adv Manuf Technol

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Dual-phase steels suffer from low edge ductility, which limits their formability. In this study, an in-plane bending test is used to investigate the initiation and evolution of edge cracks. The edges of samples were prepared by shear cutting and afterwards further deformed by the in-plane bending test. Void distribution and non-uniform plastic deformation were explored with the help of scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) analysis and microhardness measurement in different regions of the material edge. The extent of micro-cracks was revealed by microcomputed tomography (µCT) scan. The result shows that the blanking process creates inhomogeneous void distribution in the thickness direction. As the deformation increases during the subsequent in-plane bending test, the micro-cracks initiate at the burr region and grow towards the rollover region. Once they entirely pass the thickness of the material, they grow further, away from the edge. High roughness, plastic deformation, and void volume fraction were observed at the burr region, triggering crack initiation. The in-plane bending test successfully distinguished the dominant mechanism behind edge cracking.

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A review of selected small specimen test techniques for identifying deformation and failure properties of metallic materials

et al. 2022

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Influence of cutting clearance and punch geometry on the stress state in small punch test

Cited by 5 publications

References 50 publications

Punching of Ultra-High-Strength Spring Strips: Evolution of Cutting Edge Radius up to 1,000,000 Strokes for Three Punch Materials

Punching of Ultra-High-Strength Spring Strips: Evolution of Cutting Edge Radius up to 1,000,000 Strokes for Three Punch Materials

Initiation and growth of edge cracks after shear cutting of dual-phase steel

A review of selected small specimen test techniques for identifying deformation and failure properties of metallic materials

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