Mold Maintenance & Repair

OCT 2016

Mold Maintenance & Repair

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4 Mold Maintenance & Repair F E AT U R E past workorders filed away in cabinets looking for repeated product or mold issues that cause ongoing defects and unscheduled mold stops. Some shops also don't take time to review the last shot, or take measurements of critical seals or tooling fits to proactively ward off problems. The depth or level of the PM is typically based on what someone thinks the mold needs. It is a subjective decision rather than one based on historical maintenance data. Because there are so many things that could stop production and/or cause product defects at any time, shops need to understand that reg- ular cleanings won't achieve every molder's True proactive maintenance involves understanding the issues that are stopping a mold from efficiently producing quality parts on time then developing a list of ongoing targets to post and assign. By Steve Johnson and Glenn Keith It seems like such a simple question with such an obvious answer, however, the wide range of opinions expressed during our mold maintenance training cours- es might surprise you. Common mechanical sense says of course preventive maintenance (PM) works. Why wouldn't it? So we additionally ask, What does it do for you? Does it eliminate prod- uct defects or mold breakdowns? Does it reduce maintenance and labor costs? Does it keep the OEM happy? The actual benefits of PM are not so clear. During our maintenance strategy discussions, we ask which attendees have a structured, adhered-to PM program in place. Typically, a few hands go up. Then we ask how many have a PM schedule that has been validated over time to be effective based on mold- and part-defect frequencies, corrective-action costs and cycles, or some form of odometer. Typically, no hands go up. Some shops have such schedules but agree that they have not been proven to be much more effective than a decent cleaning, and even that is a struggle to get accomplished on time. Still other shops run the mold until it breaks down or until the order is complete, and then perform PM. For most, scheduled PM occurs when a mold is stopped after a certain number of cycles or parts have been run, and then it is cleaned and greased. Seldom does anyone bother to scour Do Scheduled PMs Really Work?

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