GRINDING
move workpieces to multiple sec- ondary machining process – each involving its own setup, clamping and risk of human error. Grinding is a popular and pro- ductive choice for machining high- pressure turbine blades and turbine vanes, which are the two primary components in the gas path of a jet engine, according to Marchand. “Typically, grinding is much more productive in terms of time and generates better surface fi nishes than the EDM process.” Today’s aerospace manufactur- ers face several challenges and look to grinding application experts such as United Grinding for help. “For our customers, advanced materials
Landis-Bryant RU2 ID/OD grinding system features a dual-slide arrangement in the Z axis that can accommodate multiple grinding spindles for precision part grinding applications.
and tough to hold parts have been the common hurdles to overcome,” said Marchand. “Advanced materials—such as titanium aluminide, ceramic-coatings or ceramic-matrix com- posites—when subjected to heat, have very low coeffi cients of heat transfer/poor thermal conductivity. While this is most benefi cial for jet engine performance, it creates a very dicey grinding situation. If grinding generates heat, it could then transfer into the part and cause a recast layer on the part or compromise the integrity of its base material.” Especially for processing delicate or complex shaped parts, many aerospace manufacturers come to United Grinding for turnkey workholding solutions. “These are proj- ects that they want us take ownership and responsibility for not only the grinding processes, but also all the associated workholding as well. A majority of such projects involve parts that are extremely diffi cult to clamp and hold due to thin walls or complex airfoil-type shapes. These parts are delicate, and workholding is a balancing act. The part has to be clamped rigidly enough so that it doesn’t move during grinding, but without overclamping to prevent any defl ec- tion or indentation in the part—all while trying to grind parts as quickly as possible. Often, we could easily double a customer’s process output, but the necessary workholding forces for more aggressive grinding would defl ect or dam- age the part. The grinding process itself and the workhold- ing are individual links in a chain, and the weakest of two will drive a process’s fi nal results,” said Marchand.
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AdvancedManufacturing.org | December 2016
ID/OD Grinder for High-Precision Part Production Systems for automotive production are designed with the ability to grind geometrically related features in a single clamping like the Landis-Bryant RU2 ID/OD grinding system introduced at IMTS by Fives Landis (Hagerstown, MD). Typical product applications include a wide range of parts requiring ultra-precision capabilities including applications in the fuel systems, valve train, drive train, bearing, medical, and aerospace industries. “A high-precision, multi-surface grinding system, the Landis-Bryant RU2 offers multi-slide possibilities in both the X and Z axes,” said Ron Wood, executive director business de- velopment at Fives Landis Corp. “With multiple work heads, wheel heads, and dressing systems, the machine provides fl exibility to grind several geometrically related features in a single chucking. The machine is ideal for process opera- tions such as bore, seat, and face of fuel injection nozzles, turbochargers, and shaft-type parts. With its standard and custom automation solutions, Landis-Bryant machines can be integrated into any production environment.” “The grinder’s dual-slide arrangement in Z axis can accom- modate up to six grinding spindles. It was specifi cally designed for the challenging requirements of fuel system components that require tight control over related features during grinding operations through a single handling,” said Wood. The Landis-Bryant RU2 ID/OD grinding system features granite epoxy bed that includes a thermal stability system to
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