Description: The operation of small precision mechanisms such as timers, switches, or actuators depends on burr-free, sharp-edged component parts. Traditional methods of producing these near-perfect edges on miniature parts are costly and not as precise or repeatable as some piecepart designs require. By controlling the size of burrs produced in machining operations, burr removal costs can be lowered, and the repeatability of the resulting edges improved. This investigation sought to determine how machining variables influence burr size in end-milling operations. It was concluded that the low feed rates which are commonly used in precision miniature machining create larger burrs than do more conventional feedrates. Dull tools double the size of burrs. Increasing the radial depth of cut also increases burr size on many edges. A single end-milling cut can produce eight different burrs. Burr properties vary noticeably even along a single edge. Burrs in 1018 steel, 6061-T6 aluminum, 303 Se, and 17-4 PH stainless were typically 0.003 inch thick. Burr heights ranged from 0.0001 to 0.070 inch. Conceptual and mathematical descriptions of burr formation have been developed.
Date: September 1, 1976
Creator: Gillespie, L. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department