The controls on some of those smaller injection moulders was pretty sophisticated even back in the day.
The shot control was the critical thing, assuming it has a proportional hydraulic control valve on the ram. It was and still is very common to run a pressure vs position curve on the ram as it injects to fill the mold properly. And at some point the control mode would be switched to a pressure control mode at the end of the stroke to pack the mold full. A fast PLC can do it. I suppose it could also be done with a LCNC and a bunch of time. The barrel temp control usually has a number of zones and uses electric heater bands and a thermocouple for each zone. The ram position sensor on those older machines is usually a Temposonics type sensor. A lot of them had the driver hardware built right into the controller boards to drive the Temposonics position sensor. If you are lucky there is a standalone Temposonics interface board that puts out 0-10VDC. I've worked on several injection molding machines. Dave On 9/22/2015 7:15 PM, John Thornton wrote: > I'd say the smallest touch panel you could get would be twice the price > of a good PC... > > On 9/22/2015 12:25 PM, Karlsson & Wang wrote: >>> Hi Sven. >>> It is a small machine but in any case I suggest to you to use a plc in >>> stead on LCNC. >>> I mean it is possibile to do it even with LCNC but will be much difficult. >>> I did many injection molding machine retrofit (the electric and Electronic >>> and software part) and a plc+hmi is the much confortable solution. >>> Realtime is needed as per machine cycle control (you have to be >>> deterministic for a precise and reliable control). >>> A 10ms task can be acceptable. >>> I personally made a hw and sw package with Schneider Electric plc M258 and >>> hmi Magelis GTO 10"" touch screen plus a software Application that I >>> personally developed. >>> But if you have time to spend and less money you cam try LCNC + MODBUS IO . >>> ;-) >> I would say HMIs are quite exensive comparted to slightly outdated PC, what >> do you say about that? >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
