China
Africa
Explore chapters and articles related to this topic
Computer-Integrated Assem bly for Cost Effective Developments
Published in Cornelius Leondes, Computer-Integrated Manufacturing, 2019
Rinaldo C. Michelini, Gabriella M. Acaccia, Massimo Callegari, Rezia M. Molfino, Roberto P. Razzoli
Continuous motion or indexing transfer cannot generally provide proper adaptivity to deal with secondary flows and duty-cycle variability along the principal material flow. The secondary material flows are represented by the feeding of items to be joined to the workpiece. This parts feeding requires the (elemental) functions of procurement, store up, singling, orientation, dispatch, and escapment. Small size parts are processed by vibratory bowl feeders with horizontal or vertical forwarding. Assorted parts are conveniently fed on trays; belts or AGV transportation systems are used for the tray dispatching and an important aspect covers parts orientation and setting on the trays. A more elaborated solution uses parts kits and suitable kit fixtures separately fixed at suitable storing and sorting stations.
Additional Topics and Case Histories
Published in Lewis H. Bell, Douglas H. Bell, Industrial Noise Control, 2017
Lewis H. Bell, Douglas H. Bell
Basically, the feeder bowl consists of a cylindrical bowl with a spiral track attached inside of the bowl. The bowl is coupled through leaf springs to an electromagnetic base exciter unit. The angular vibratory motion of the bowl then causes the parts, generally small, to move, or, in a sense, to march, in an almost military fashion up the spiral tract to the exit ramp. The major source of noise is the part-to-bowl and part-to-part impact. The noise is broadband in spectral character with peak levels typically in the range of 2000 to 10,000 Hz. Shown in Fig. 14.7 is an actual octave band spectral analysis of the noise from a small vibrator bowl with the microphone located at approximately 1 m.
Introduction and Background
Published in Haym Benaroya, Mark Nagurka, Seon Han, Mechanical Vibration, 2017
Haym Benaroya, Mark Nagurka, Seon Han
Vibratory Feeding and Finishing Parts orienting31 is often important in automation systems. In many mechanized production processes, parts produced by one machine are dropped randomly into a bin and then must be oriented properly before being fed into another machine for further processing or assembly. For small parts one of the most common ways to accomplish this task is to use a vibratory feeder. Vibratory bowl feeders32 exploit vibration in a positive way to orient and sort parts.
Experimental study on combustion characteristics of a CI engine runs on a renewable fuel
Published in International Journal of Ambient Energy, 2022
P. Niklesh Reddy, Naseem Khayum, Santosh Kumar Paruvada, Abhijeet Killol, S. Murugan
In this experiment, three different bowl-in pistons were used namely bowl-in piston, IB piston, and SGIB piston. The bowl-in piston which is used in this investigation is shown in Figure 5(a,b). The diameter of the bowl in the piston is 52 mm and depth is 26 mm. The second piston used in this study was IB piston which is shown in Figure 6(a,b). On the surface of the bowl-in piston, four micro drilled holes were made. They were symmetrically located as shown in the figure. The diameter of the hole is 3 mm and depth is 5 mm in each hole. The holes are at a depth of 20 mm and at an angle of 50.29° from the top of the piston surface. The airflow motion in the combustion chamber due to IB piston is tumble flow. The third piston used in this study was SGIB piston which was made from IB piston is shown in Figure 7(a,b).
Effect of turbulence and multiple injection strategies on homogeneous charge compression ignition (HCCI) diesel engines – a review
Published in International Journal of Ambient Energy, 2022
Kavati Venkateswarlu, Konijeti Ramakrishna
The conclusions drawn from this work can be as follows. Higher turbulence and increased charge velocity with increasing swirl result in increased heat transfer to the walls, which lower the peak pressures and temperatures and can reduce the NOx and CO2 emissions. Multi chambered pistons can enhance the effect of turbulence for better mixing and combustion. Moreover, combustion rate is lower for high-swirl pistons when compared to that of low swirl case resulting in low combustion efficiency. The bowl diameter also plays an important role in inducing the swirl. Lower diameter bowls cause higher swirl when compared to higher bowl diameter case. The high-swirl piston, when compared to the low swirl piston, produces longer delay in SOC and a dwindling in the peak value of HRR.
Performance and combustion characteristics of a retrofitted CNG engine under various piston-top shapes and compression ratios
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Anh Tuan Le, Dang Quoc Tran, Thanh Tam Tran, Anh Tuan Hoang, Van Viet Pham
Three options of pistons with different bowl-in-piston chambers, were combined with two different values of compression ratio (11.5:1 and 12.5:1). Schematic of the piston-top, piston parameters, and shapes of bowl-in-piston chamber are presented in Figure 2. There are three cases of the piston-tops, which consist of PS1 (concentric bowl-in-piston, CR = 11.5:1 with 66 mm bowl diameter, 19 mm bowl depth), PS2 (concentric bowl-in-piston, CR = 12.5:1 with 61.5 mm bowl diameter, 19 mm bowl depth), PS3 (eccentric bowl-in-piston, CR = 12.5:1 with 61.5 mm bowl diameter, 19 mm bowl depth). In other words, there are two different compression ratios of 11.5:1 and 12.5:1 (PS1 vs. PS2), and two options of piston-top geometries including concentric and eccentric ones (PS2 vs. PS3).