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TECH FRONT


Precision & Repeatability for Challenging Workholding Applications


At Hydra-Lock, we continue to develop our workholding technologies, engineering industry’s best chucks and arbors while providing application support to meet the increasing demands of the high-tech aerospace industry. Among our many innovations are solid- and split- steel expanding sleeve designs, and the Conform-A® technology for the highest expansion and capability to hold thin-walled and out-of-round components, while averaging center, and without rounding.


type of pressure-coolant reamer. By the same chief-engineer author as TP58PUB23, from Star Cutter Co. (www.starcutter. com; Farmington Hills, MI), the paper describes the develop- ment of multifluted tool designs for the most efficient produc- tion and gundrilling processes combined with pressure-cool- ant reaming processes for efficient and low-cost production of precision long, short and stepped holes in parts. Papers TP66PUB26 and TP67PUB3 offer insights into the


effects of pulsating coolant pressures in oil-hole drills. There was a substantial increase in the metal removal rate compared with steady flow, dammed-up chips were eliminated and high- er feed rates helped chip removal. The 1967 paper provided a progress report on more than 300 installations of a “jet pulser” pump system on machines processing a variety of materials. TP67PUB207 briefly outlines how advances in coolant techniques such as the application of vapor coolant and pul- sating coolant contributed to the wider use of the coolant-hole drill. A prototype oil-hole (coolant-fed) drill press for experimen- tal drilling with drills up to ½" (12.7-mm) diameter is described in TP70PUB64. Instrumentation, drill point configuration, cool- ant, drilling technique and hole condition are covered.


Research Honor Highlights Holemaking In June, the 2015 NAMRI/SME S.M. Wu Research Imple- mentation Award will recognize Dr. John S. Agapiou of General Motors R&D (Warren, MI) for patented and commercialized innovative holemaking tools to reduce the number of passes required to drill and finish complex bores in powertrain com- ponents. The four-flute and modified three-flute solid carbide drills were invented and developed with the sole purpose to produce top-quality bores in one or two passes as opposed to the traditional three to six passes, with sizable savings in cycle time, investment cost, tooling and maintenance. The Wu Award highlights research was presented at an annual North American Manufacturing Research Conference (NAMRC) that has been implemented in industry with signifi- cant impact. Agapiou’s paper, “An Evaluation of Advanced Drill Body and Point Geometries in Drilling Cast Iron,” was presented at NAMRC in 1991. TechFront is edited by Senior Editors Patrick Waurzyniak, pwaurzyniak@sme.org, and Ellen Kehoe, ekehoe@sme.org.


Originators and developers of Hydraulic Chucking


More than 100 papers in SME’s knowledge collection focus on aspects of holemaking, including applications of EDM/ECM, laser and ultrasonic techniques. SME Technical Papers (coded as TP…PUB…) and search options for the collection are available at http://tinyurl.com/SearchTPs.


www.hydralock.com 44 AdvancedManufacturing.org | April 2015


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