Production Machining

MAY 2018

Production Machining - Your access to the precision machining industrial buyer.

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when honing soft materials ranging from stainless steel to low carbon steels. is may lead to serious and costly problems such as ruined honing tools and machine failure. When the lubricant film separating the mandrel and workpiece fails, the mandrel can weld to either the workpiece or the chips, leaving severe scratches on the mandrel and part, or worse—a broken tool. A common myth is that honing tools without guide shoes are immune to welding problems. This is not true, and in fact, it's a sure sign of a honing fluid problem. If the honing fluid fails, it will permit stone loading, where metal chips created by the cutting action of the honing stones stick to the stone surface. When stone loading occurs, there will be metal-to-metal contact and welding, with the same undesirable results as when using a honing tool with metal guide shoes. The cost of broken tools can quickly overtake the savings found with inferior honing fluids. e use of quality honing oil allows the use of higher honing pressures without experiencing welding of the tooling or workpiece chips. No matter what, reduction of friction in the honing process always improves the bottom line, whether it be cost/part, cycle time, abrasive consump- tion or any other measure of merit. Selecting the Right Honing Fluid ere is a honing fluid formulated for almost every material used in manufacturing, from aluminum to zirco- nium. Choices include petroleum or organic oil-based honing and superfinishing fluids and synthetic/semi- synthetic, water-based fluids. Selecting the right honing fluid is mostly application driven based on restrictions, the material being honed and the tooling used. e presence of restrictions or special requirements limit the available choice of honing oils. ere are special honing oil formulations that conform to Food and Drug Administration (FDA) and European Commission guidelines and regulations applicable to honing medical devices that will be implanted into the human body. Aerospace companies often have lists of approved honing oils used for honing critical parts. Vendors are required to use only honing oils on the approved list. There are special honing oils that conform to FDA and EC guidelines applicable to honing medical devices that are implanted into humans. Why Honing Oils Matter productionmachining.com :: 33

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