Abstract
Effect of pretreatment by shotblasting to workpieces before lubricating of a non-chemical conversion lubricant in cold forging was examined by making several surfaces with different topographies, using wet shotblasting. Backward-cup extrusion test estimated the performance of the pretreatment. This test provides extremely large surface expansion to bring severe tribological conditions. After the tests, the insides of the cup-like workpieces were observed with scanning electron microscope and surface-analyzed energy dispersive X-ray spectroscopy to measure the distributive amount of the lubricant on the workpiece. The pretreated surface resulting large aspect ratio (Ra / RSm) raised the potential of lubrication performance. Especially, the surface treated with angular shaped media indicated higher potential to improve anti-galling performance.
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