Abstract. In the literature, authors have made contributions in the area of partially
compliant slider-crank (rocker) mechanisms possessing rigid joints that may
cause backlash inherently. On contrary, fully compliant mechanisms offer no
backlash which is a valuable property for the cases where high precision is
required. In this paper, we proposed a fully compliant slider-crank
mechanism that performs large stroke. Kinematic performance of the mechanism
is investigated analytically. Dimensions of the mechanism are optimized to
obtain maximum translational output, while keeping deflections of flexible
hinges equal to each other and as small as possible. A design table
displaying stroke, axis drift of the output segment, and critical stresses
of compliant segments are presented. As an example, a compliant mechanism is
designed by using rigid body replacement technique. Then, via nonlinear
finite element analysis technique, analytical results are verified. Finally,
a prototype is built to compare output stroke and axis drift with analytical
approaches. The results of experiments verified that the theoretical
approaches are consistent.
In this article, a novel fully compliant spherical four-bar mechanism is introduced and its generalized design methodology is proposed. The original fully compliant mechanism lies on a plane at the free position (undeflected position); therefore, it has the advantages of ease of manufacturing, minimized parts, and no backlash. First, the mobility conditions of the mechanism are obtained. The dimensions of the mechanism are optimally calculated for maximum output rotation, while keeping the deflection of flexural hinges at an acceptable range. Using an optimization method, design tables are prepared to display the relationship between arc lengths and corresponding deflections of flexural hinges. Input–output torque relationship and stresses at compliant segments are obtained analytically. A mechanism dimensioned by this novel design method is analyzed by a finite element analysis method, and the analytical results are verified. Finally, the mechanism is manufactured and it is ensured that the deflections of the compliant segments are consistent with the theoretical results.
Üç boyutlu yazıcılar yeni bir üretim metodu olarak endüstride birçok alanda kullanılmaktadır. Esnek mekanizma üretiminde de bu yöntemin kullanımı gün geçtikçe yaygınlaşmaktadır. Bu çalışmada üç boyutlu yazıcıların üretim etkinliğinin arttırılması ve bu yöntemin ileriki çalışmalarda esnek mekanizmalara da uygulanabilmesi amaçlanmıştır. Üretim hızının arttırılarak daha yüksek mukavemetlerde numunelerin elde edilmesi amacıyla testler düzenlenmiştir. Bu amaçla farklı doluluk oranlarında, gyroid geometri kullanılarak test numuneleri hazırlanmıştır. %10, %20, %40 ve %60 doluluk oranlarındaki numunelerin üretim hızları kaydedilmiştir. Her numuneden, beşer adet reçine emdirilmiş ve emdirilmemiş test numuneleri hazırlanmıştır; çekme ve eğilme testleri bu numuneler kullanılarak gerçekleştirilmiştir. Elde edilen sonuçlar düzenlenerek dayanım, üretim süresi ve üretim maliyeti açısından karşılaştırılmıştır.
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