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and orifices for hybrid fluid bearings similar to that of aerostatic journal bearings [19]

Some commercially available machines are automated even to the point that they are able to shuttle boards into the press, pick and place connectors, select a connector-appropriate pressing tool and supporting tool anvil, rotate the tools to the proper orientation, and press multiple connectors sequentially on a single board or multiple nested boards. There are several ways to control the press-fit process. Methods and merits of each are discussed in the remainder of this chapter, but first a more detailed review of the mechanics of the press-fit process is in order.

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Press tool and support plate are fabricated to match connector requirements and PCA layout. The PCA is placed on the press-fit tooling fixture support plate. The operator manually places the connector into the appropriate plated through-holes in the PWB. The ram and tool are aligned to the connector to be pressed. When press-fit connector leads are forced into PWB plated through-holes during a pressing cycle, there is a characteristic fingerprint of force versus vertical distance traveled for each connector and PWB type.The various events and slopes that comprise the fingerprint are shown in Fig. 49.10. As pressing progresses, connector leads are forced into the plated through-holes and the compliant section of its pins deform elastically, then plastically. Continued resistance is encountered due to the friction of the collapsed pins sliding along the PTH barrel walls. Another inflection in the plot occurs where the connector fully seats against the PWB. Further force affects little or no change in distance and the press cycle ceases. Were the cycle to continue, damage to the PWB would result.

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FIGURE 49.10 Force versus distance plot of a press-fit cycle. Inflection points and regions are as follows: (a) initial force is applied to the press-fit connector; (b) the compliant section of the pin collapses; (c) the pin collapse is complete; (d) the pin slides along PTH barrel wall, creating friction; (e) the connector is fully seated; (f) continued pressing makes little change in press distance. The pressing cycle is complete.

For best results, a method that allows real-time measurement and control of the pressing process is preferred and is available on today s commercial presses. There are four commonly used pressing routines, but only three take advantage of force-sensing, distance-sensing, or real-time feedback control of the connector press. Connector complexity and equipment availability dictate press-fit assembly methodology.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Hamrock, BJ, Fundamentals of Fluid Film Lubrication, McGraw Hill, 1999 Funk and Wagnalls, New Encyclopedia, Bearings, Volume 3, 2002 Powell, JW, Design of Aerostatic Bearings, The Machinery Publishing Co Ltd, 1970 Shigley, JE and Mischke, CR, Mechanical Engineering Design, McGraw Hill, 2001 El-Tayeb, N, Journal Bearings, Faculty of Engineering and Technology, Multimedia University, Melaka, Malaysia Wilcock, DF and Booser, ER, Bearing Design and Application, McGraw Hill Book Company, 1957 Barwell, FT, Bearing Systems: Principles and Practice, Oxford University Press, 1979 East Med Yacht Company>2005 [online] Slocum, AH, Precision Machine Design, Prentice Hall, 1992 SPG Media Limited Deep Blue-Pipelay Vessel, <http://wwwship-technologycom> 2005 SKF Aeroengine SKF The Knowledge Engineering Company, <http://investorsskfcom/annual2001/ 012_knowledge_companyphp> Machine Tool Design Handbook, Central Machine Tool Institute, 1978 Juvinall, RC and Marshek, KM, Fundamentals of Machine Component Design, John Wiley and Sons, 2000 Mott, RL, Machine Elements in Mechanical Design, Macmillan Publishers, New York, 1992 Pethybridge, G, Plain Bearing Options for Pumps, Waukesha Bearings, 2002

Uncontrolled Pressing This was the most prevalent technique for a long time, but it rapidly lost ground to more sophisticated pressing methods, as described later in this section. It commonly relies on an arbor press and human muscle to force the press-fit connector into the PWB. There is neither force sensing nor speed control. It is the least reliable way to press connectors into PWBs and is not recommended for complex connectors or fragile PWBs. If too high a ram speed is used on a delicate connector, its pins may buckle. This method may not provide enough force for some high-lead count connectors. Although this type of pressing is discouraged, it may be adequate for low lead-count, coarse-pitch connectors in noncritical assemblies.As with any press routine, a suitable support fixture must be used beneath the board to keep the assembly from breaking or flexing. It should incorporate support to counter the forces of the ram, and relieved areas to accept protrusion of press-pins below the bottom side of the board and clearances for bottomside components as shown in Fig. 49.11.

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