Kayar baský plakalý artýmlý sac þekillendirme yöntemiyle þekillendirilen Erdemir 7136 sacýnýn geri esneme davranýþýnýn araþtýrýlmasý

Artýmlý þekillendirme yöntemi ile kalýp imalatýna ihtiyaç duyulmadan hýzlý ve düþük maliyetli prototip parça üretimi yapýlabilmektedir. Ancak bu yöntemdeki en önemli sorunlardan bir tanesi üretilen parçalarýn geometrik doðruluðudur. Geometriksel hatanýn en büyük kaynaðý ise geri esneme olayýdýr. Bu çalýþmada, kayar baský plakalý artýmlý sac þekillendirme metodu kullanýlarak 1 mm kalýnlýðýndaki Erdemir 7136 sacý þekillendirilmiþtir. Klemp sýkma (sacý tutma) basýncý, artým miktarý, form takým çapý ve ilerleme hýzý parametrelerinin geri esnemeye olan etkileri araþtýrýlmýþtýr. Araþtýrma neticesinde geri esneme açýsýnýn takým çapý arttýkça büyüdüðü, ilerleme hýzý ve artým miktarýnýn artmasý ile düþtüðü tespit edilmiþtir. Çalýþma kapsamýnda optimum parametre deðerleri 5.8776 bar klemp sýkma basýncý, 1500 mm/dk ilerleme hýzý, 0.75 mm artým miktarý ve 5 mm takým çapý olarak belirlenmiþtir.

Investigation of the springback behavior of Erdemir 7136 sheet formed by rolling blank holder incremental sheet forming method

Rapid and low-cost prototype parts can be produced without the need for mold production with incremental forming method. One of the most important problems in this method is the geometry accuracy of the products produced. The biggest source of the geometric error is the springback event. In this study, Erdemir 7136 sheet with a thickness of 1 mm was formed by using rolling blank holder incremental sheet forming method. The effects of holding pressure, increment, tool diameter and feedrate parameters on springback were investigated. As a result of the research, it was found that the springback angle increased with increasing of form tool diameter and decreased with increasing of feedrate and increment. The optimal conditions for springback are determined as 5.8776 bar holding pressure, 1500.0 mm/min feedrate, 0.75 mm increment and 5 mm tool diameter.