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| Effects of Material Properties and Punch Tip Radius on Spring-Forward in 90�� V Bending Processes |
| Dilipak Hakan1,��zdemir Mustafa2,Sarikaya Murat3 |
1. Manufacturing Department, Technology Faculty, Gazi University, Ankara 06500, Turkey
2. Mechanical Education, Institute of Science and Technology, Gazi University, Ankara 06500, Turkey
3. Machine and Metal Technology Department, Vocational High School, Sinop University, Sinop 57000, Turkey |
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Abstract Bending process is one of the most significant fields of application of sheet metal die. Sheet metals are exposed to some spring-back or spring-forward depending on elastic deformation following bending process. S235JR (1��0038) materials having a thickness of 4 mm were bent with 90�� punches having 5 different tip radiuses. The bending process was carried out by making the punch waited on the material for 30 s (30 s wait bending) and by removing the punch without waiting (direct bending). Specimens were prepared in three forms as non-heat-treated, normalized and tempered. At the same time, all experiments were performed at a deformation speed of 25 mm/min. As a result, it was determined that as punch tip radius increased, the amount of spring-forward decreased. Although normalizing process applied to specimens increased the amount of spring-forward, tempering process decreased it. The amount of spring-forward was decreased in 30 s wait bending process.
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Received: 21 June 2012
Published: 14 October 2013
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2013, Vol. 20 
