China 
Africa 
Explore chapters and articles related to this topic
POLCA–The New Material Control and Replenishment System for QRM
Published in Rajan Suri, John Burke, Quick Response Manufacturing, 2020
Each customer order to CFP is served by using the appropriate combination of cells needed to print, fabricate, and assemble that order. Orders can have different demands within the cells too: The punching requirements for an order for large plates with lots of holes may use a lot of time on a CNC turret punch in F3 and not much time on the shear, while another order for small plates may have very little punching time but take a lot of time for shearing. In addition, some large plates may need to be sheared first before they can fit on some of the punches, while small plates may need to be punched first and then sheared.
Optimum design and analysis of a novel planar eight-bar linkage mechanism
Published in Mechanics Based Design of Structures and Machines, 2023
Recep Halicioglu, Assylbek Jomartov, Moldir Kuatova
Another alternative to press manufacturing has been the development of different mechanisms to achieve the desired motion gain. These mechanisms have been also driven by a servo motor for flexibility. Soong (2014) developed two types of 1DOF seven-bar geared linkage mechanisms consisted of a slider-crank mechanism or scotch yoke mechanism. In his study, one input cycle was corresponding to two output cycles. Disadvantages of the scotch yoke are the rapid wear of the slot in the yoke and sinusoidal slider motion having a higher forming acceleration. Pennock and Israr (2009) carried out a kinematic analysis and a kinematic synthesis of an adjustable six-bar linkage proposed as a variable-speed transmission mechanism. They tried an angular dwell without slider. He et al. (2010) introduced a turret punch press with an eccentric-toggle mechanism driven by a servomotor for a dwell motion. But a sinusoidal slider motion was obtained without a servo motor. Bai, Gao, and Guo (2011) proposed a design method based on the combination of the dual screw actuation unit, the parallel mechanism with kinematic redundancy, and the toggle mechanism with the symmetric arrangement where screws were driven by multi-servomotors. Losses are likely to be high due to the screw drive and the complexity of the toggle mechanism. Also, lower speed capacity can be considered as a disadvantage of the screw actuations in presses. Halicioglu, Dulger, and Bozdana (2014) conducted a study on the kinematics of a slider-crank mechanism by using Matlab/Simulink platform. They showed that it was possible to extend motion scenarios for the slider with servo inputs. Jomartov et al. studied on the implementation of the four-class kinematic chain to synthesize the crank press mechanism (Jomartov and Tuleshov 2018, 2019; Jomartov et al. 2019; Tuleshov, Jomartov, and Kuatova 2019). Liu et al. (2019) proposed a synthesis strategy for four-bar, six-bar, and eight-bar linkages for a rectilinear movement task and compared the resulting performances of the designs. There are different types of linkage mechanisms in the literature, and they have some disadvantages, such as inability to produce long dwell motion without servo motor or increase in complexity and losses. In addition, since force is transmitted to the slider from a single point in most mechanisms, the unbalanced slider and nonuniformly distributed force affect the forming precision and quality.