In the end, the lube will need to be removed and disposed of, including straight oil. It is best to keep the lubricant active for as long as possible. Regular skimming of tramp oil may prevent a cleaning problem down the road.ĭisposal has become almost as expensive in a European country. Many way oils are designed to stay on the ways, even with a detergent coolant, making them difficult to clean. The coolant should resist contamination by way hydraulic oils or tapping fluids. Platers and painters need to keep disposal costs down so they try to extend the cleaning baths’ use. A shop’s entire production could be lost or require extensive rework.Įase of cleaning and residue removal is important now more than ever. Requesting any lab testing or users experience is critical. Sometimes, it’s not possible to repair the damage because the plater has over-etched the parts, ruining tight tolerances. If it does do harm, the consequences appear when the parts are at the plater or the painter. The lubricant should do no harm to the materials and the required secondary operations or plating. If the lubricant helps provide the proper finish, then helps extend it or maintains it for the life of the tool, there is a basis to start with. If the shop floor is now meeting the minimum or have longer life, at least there is a benchmark to measure from. Tool manufacturers take great care preparing lists and expected life to provide a good idea of how long an insert will last at an expected surface finish. With this info, even different parts and materials can be compared. A simple list of tools used and operator notes as to why the tools needed to be changed helps in the determination. There are simple ways to monitor or document tools and surface finish. The lubricant should protect the surface, allowing a controlled non-harmful buildup or oxides keeping the materials natural cut color.Ĭonsider surface finish acceptable if it looks good. A fresh cut aluminum or steel part will build an oxidized surface as soon as it is exposed to oxygen. They not only prevent corrosion, but may prevent plating or anodizing. Some corrosion prevention chemicals classified as metal deactivators prevent chemical attack of the part surface and may need to be removed by sanding or some physical operation. A tapping fluid could cause the same plating problems. Silicone is not the only additive that causes havoc with post processes often done to machined parts. There are additives not normally used in the metalworking industry, such as silicone (often used in floor cleaners), but may show up in a coolant concentrate. Many plating shops are using the cleaning tanks way beyond the useful life to save money. Have parts come back from the plater or painter ruined because of some sort of chemical contamination or residue? The vendor always blames the shop, but the diagnostic requires some detective work. The lubricant should not harm the parts or metal being manufactured. The water or moisture can accumulate on other machine surfaces, causing what might be called “vapor rust.” A certain amount of rust inhibitor must evaporate with the moisture to prevent vapor rust. If there is too much capillary action, the way oil might be lifted from the ways, causing metal-to-metal contact and “stick/slip” motion. The chemical makeup must be elastomer friendly, with excellent corrosion inhibitors. Too much lubricity equals too much heat.įluids should do no harm to the machine, parts being manufactured or the operator. If the emulsion size is large, the lubricant might induce excess pressure. Tiny chips are produced, but the chip formation is not with a positive rake, and as the process engineer knows, the more negative the cut, the more heat will need to be removed. A grinding operation requires less lubricity, more cooling. Required in-use concentration is tied to the type of operation the lubricant is being asked to perform. Extremely low concentration use usually equates to expensive tank side additives and increased, in-use maintenance. A certain amount of turnover or required coolant additions helps keep low concentration additive up to the recommended dose. This accumulates more concentrated foreign matter. The tighter the disposal loop is, the better. This is intrinsically linked to the in-use maintenance program. Some products require tank-side additives, such as biocides, fungicides, lubricity additive and chemical water treatment, all of which can be an added.
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