An Examination Of Fracture Splitting Parameters Of Crackable Connecting Rods

Abstract

Kırarak ayırma, otomobil motorlarında kullanılan biyel kollarının üretiminde son yıllarda geliştirilen modern bir metoddur. Bilinen yöntemlerle karşılaştırıldığı zaman bu yöntemin avantajları oldukça fazladır. Bu metot üretim proseslerini azaltır, alet ve ekipman yatırımını azaltır, daha az enerji kullanılmasını sağlar. Sonuç olarak, toplam üretim maliyetinde % 25 gibi önemli bir oranda tasarruf sağlar. Ayrıca yüksek kalite ve hassasiyette biyel üretimi sağlanır. Kırarak ayırma yöntemi çok ilgi çekmiş, halen teknolojik olarak bir çok modelde kullanılmaktadır. Bu makalede C70S6 çeliğinden yapılmış biyel kolu darbeli yük ile kırılarak kırma parametreleri incelenmiş, kırılan yüzeylerin optik ve SEM analizleri yapılmıştır. Yük ve hız parametreleri incelenmiş olup, uniform dağılan darbeli kuvvet etkisi ile başlangıç çentiğinin gevrek-klevaj kırılma tipine neden olduğu sonucuna varılmış, iç yapının bu gevrek kırılmaya neden olduğu ve tokluğu azalttığı sonucuna varılmıştır.

Kinematics and dynamzics simulation and reliability analysis of crank and connecting rod mechanism of single cylinder four-stroke internal combustion engine

“…The results show that the probability distribution of stress on the connecting rod is close to the normal distribution, so the stress on the connecting rod in the working process can be regarded as the normal distribution.The material of connecting rod is 35CrMo, and the yield strength limit is 35CrMo. According to reference [11,12], the standard deviation of material strength is as follows: The reliability is 0.999999 obtained from literature [13]. The connecting rod has high reliability and safety, and can meet the working requirements.…”

Heat treatment effects to the fracture splitting parameters of C70S6 connecting rod

“…The fracture parameters and microstructures have been examined by author and his colleagues in detail re-cently [7,8]. Liming [13].…”

“…7 C70S6 con-rod before fracture test Fig. 8 A schematic view for fracture splitting process [8] The fracture tests have been executed con-rods separately and a perfect brittle fracture has been obtained. Perfect fracture has to ensure some parameters; these are:…”

“…In detail, for crackable connecting rods as far as strength is desired but also toughness is not much allowed for fracture splitting property, theoretically upper bainite could be a perfect choice for crackable connecting rods, also there is no technological use of bainite in crackable connecting rods. The author has proved perfect fracture for upper bainite in his Ph.D. thesis [4]. The parameters for perfect fracture is explained in detail at chapter 2.2.…”

Effect of Different Microstructures on the Performance of Air-Cooled Forging Steel 46MnVS5 Fracture Splitting Connecting Rod

“…Normal microstructures of C70S6, 36MnVS4, 46MnVS5 are ferrite+pearlite. Z. Ozdemir et al [10] discussed performance of martensite and tempered martensite of C70S6 for splitting fracture, to confirm possibility of thatmicrostructures using in splitting fracture. This study compared different microstructures and discussed whether these microstructures can meet fracture and using performances.…”