Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping Parts
Stamping dies perform two functions in the hot stamping process of body-in-white components. Firstly, they form the steel sheet into the desired shape and, secondly, they quench the steel at a cooling rate that leads to hardening by means of the austenite-γ to martensite transformation. Th...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-05-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/8/6/385 |
| _version_ | 1811238515639320576 |
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| author | Maider Muro Garikoitz Artola Anton Gorriño Carlos Angulo |
| author_facet | Maider Muro Garikoitz Artola Anton Gorriño Carlos Angulo |
| author_sort | Maider Muro |
| collection | DOAJ |
| description | Stamping dies perform two functions in the hot stamping process of body-in-white components. Firstly, they form the steel sheet into the desired shape and, secondly, they quench the steel at a cooling rate that leads to hardening by means of the austenite-γ to martensite transformation. This microstructural change implies a volume expansion that should lead to a force peak in the press, which has yet to be detected in industrial practice. In this study, a set of hot stamping laboratory tests were performed on instrumented Al–Si-coated 22MnB5 steel flat formats to analyze the effect of the stamping pressure on the detection of the expected peak. Plotting the sheet temperature and pressure curves against time allowed us to identify and understand the conditions in which the force peak can be detected. These conditions occurred most favorably when the stamping pressure is below 5 MPa. It is thus possible to determine the exact moment at which the complete hardening transformation occurs by monitoring the local pressing force of the tool in areas where the pressure exerted on the metal format is below 5 MPa. This information can be applied to optimize the time needed to open the dies in terms of the complete martensitic transformation. |
| first_indexed | 2024-04-12T12:43:02Z |
| format | Article |
| id | doaj.art-7d1683c81c2c4d49895c3f1492f877dc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-12T12:43:02Z |
| publishDate | 2018-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-7d1683c81c2c4d49895c3f1492f877dc2022-12-22T03:32:43ZengMDPI AGMetals2075-47012018-05-018638510.3390/met8060385met8060385Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping PartsMaider Muro0Garikoitz Artola1Anton Gorriño2Carlos Angulo3Metallurgy Research Centre IK4 AZTERLAN, Aliendalde Auzunea 6, 48200 Durango, SpainMetallurgy Research Centre IK4 AZTERLAN, Aliendalde Auzunea 6, 48200 Durango, SpainDepartment of Mechanical Engineering, University of the Basque Country (UPV/EHU), Plaza Ingeniero Torres Quevedo 1, 48013 Bilbao, SpainDepartment of Mechanical Engineering, University of the Basque Country (UPV/EHU), Plaza Ingeniero Torres Quevedo 1, 48013 Bilbao, SpainStamping dies perform two functions in the hot stamping process of body-in-white components. Firstly, they form the steel sheet into the desired shape and, secondly, they quench the steel at a cooling rate that leads to hardening by means of the austenite-γ to martensite transformation. This microstructural change implies a volume expansion that should lead to a force peak in the press, which has yet to be detected in industrial practice. In this study, a set of hot stamping laboratory tests were performed on instrumented Al–Si-coated 22MnB5 steel flat formats to analyze the effect of the stamping pressure on the detection of the expected peak. Plotting the sheet temperature and pressure curves against time allowed us to identify and understand the conditions in which the force peak can be detected. These conditions occurred most favorably when the stamping pressure is below 5 MPa. It is thus possible to determine the exact moment at which the complete hardening transformation occurs by monitoring the local pressing force of the tool in areas where the pressure exerted on the metal format is below 5 MPa. This information can be applied to optimize the time needed to open the dies in terms of the complete martensitic transformation.http://www.mdpi.com/2075-4701/8/6/385hot stampingpress hardeningmartensitic expansionforce peakcycle time |
| spellingShingle | Maider Muro Garikoitz Artola Anton Gorriño Carlos Angulo Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping Parts Metals hot stamping press hardening martensitic expansion force peak cycle time |
| title | Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping Parts |
| title_full | Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping Parts |
| title_fullStr | Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping Parts |
| title_full_unstemmed | Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping Parts |
| title_short | Effect of the Martensitic Transformation on the Stamping Force and Cycle Time of Hot Stamping Parts |
| title_sort | effect of the martensitic transformation on the stamping force and cycle time of hot stamping parts |
| topic | hot stamping press hardening martensitic expansion force peak cycle time |
| url | http://www.mdpi.com/2075-4701/8/6/385 |
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