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What're good brands of electric injection molding machines

The critical parts of the question will be (1) "What are you typically going to run on the machine?"; (2) "Why do you want electric?, and, as a subset of (2), (3) would be "What part of the machine do you want to be electric? e.g. clamp, injection, ejection, nozzle contact force. What about hydraulic core pulls--will you need those?"

Different manufacturers take different approaches. Ball screws for major axes are very popular, but they are also limited in both speed and longevity, in part because of the single point of contact of the balls with their races. Planetary gear systems are much stronger, can be much faster and are much longer lasting. Tiebarless platens give great access to the molding area, but continue to have issues with mold alignment. Electric machines may, or may not, be any cleaner than well-maintained hydraulic machines, it depends on the form of the electric drive--direct drive is much cleaner than belt driven. Using hydraulic force for nozzle contact is a much better way to do things--hydraulics are designed to statically "push" on something; a servo motor is designed to move very precisely, pushing on something is not its strong suite. A careful analysis needs to be done on all these questions, unless your customer says, "I want you to do this on an electric machine," then the point is probably moot.

There have been several popular suppliers, let me add one more to the list for your investigation: Arburg. They make the whole gamut of machines, from all-electric in every axis, to hybrids of every description, to fully hydraulic machines; from simple horizontal "standard" machines to vertical and multi-shot and multi-material. It might be worthwhile to sit down with someone from them and see if any of their offerings meet your needs.

When considering an electric machine and each manufacturers claimed advantages, consider the reason for the design and review the patents associated with electric versus hydraulic. Roboshot and Milacron pioneered early electric designs and most others followed by designing around existing IP. Pick the application, performance, long term reliability and reputation on electric machine performance separating hydraulic reputation.

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