ssssssssss - CHAPTER 2.0 PNEUMATICS _ 2.1 Learning Outcomes...

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CHAPTER 2.0 PNEUMATICS __________________________________________________________________ 2.1 Learning Outcomes At the end of this course, the students would be able to apply and appreciate the knowledge to: (1) Perform the safety and regulations apply in engineering workshop and/or laboratory. (2) Describe briefly about pneumatic control system. (3) Design the pneumatic circuit diagram and elements. (4) Correctly install components in the pneumatic, electro pneumatic, hydraulic and control system according to the given circuit diagrams. (5) Test runs the assembled system components base on the given circuit diagrams. 2.2 Pneumatics Theory A fluid power system is one that transmits and control energy through the use of pressurized liquid or gas. In Pneumatics, this power is air. This of course from the atmosphere and is reduced in volume by compression, thus increasing its pressure. Compressed air mainly used to do work by acting on a piston or vane. While this energy can be used in many facets of industry, the field of industrial pneumatics is considered here. The correct use of pneumatic control requires an adequate knowledge of pneumatic components and their function to ensure their integration into an efficient working system. Although electronic control using a programmable sequencer or other logic controller is currently specified, it is still necessary to know the function of the pneumatic components in this type of system. 2.2.1 What Can Pneumatics do? Operation of heavy or hot doors. Unloading of hoppers in building, steel making, mining and chemical industries. Forming operations of bending, drawing and flattening. Bottling and filling machines. Pneumatic robots. Component and material conveyor transfer. Air separation and vacuum lifting of thin sheets. Figure 2.1 show the application of pneumatic component at chip bonding process which consists of a vacuum unit.
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Figure 2.1: Chip Bonding. 2.2.2 The Advantages and Limitations of Pneumatic It has several operation modes; can be fully automated, manually operated and semi automated mode. It is clean, suitable for several processes which are very sensitive, especially for hazardous chemicals and electronic components. The equipments are very cheap compared to other methods. The accuracy of the end results is moderate. Reduce production time and cost – mass production. There is no other waste produced from the operating system except air. Compress is relatively insensitive to temperature fluctuation. This ensures reliable operation, even under extreme condition (depend on protection material). However, pneumatic technology also has their own limitations. Listed below are the limitations of pneumatic technology: Only clean air with lowest humidity is allowed to be in pneumatic system. So, compress air need good preparation to filter any kind of dirt and condensate. It is seldom to get uniform and constant piston speed with
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This note was uploaded on 10/17/2009 for the course MET 387 taught by Professor Dean during the Spring '09 term at Old Dominion.

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ssssssssss - CHAPTER 2.0 PNEUMATICS _ 2.1 Learning Outcomes...

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