MoMas

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About MoMAS ® : Functions

 

MoMAS measures various process variables such as exit temperature, extrusion force, ram velocity etc. continuously and displays the runs of these variables in the current and previous cycles. Also displayed is information such as the extrusion time per billet, idle times between cycles and the mean and standard deviation of the exit temperature over cycles. MoMAS calculates the optimal input functions for iso-thermal extrusion employing measured and input data and displays these at the start of each cycle. The operator can select the run of the inputs proposed by MoMAS  or modify it.  Alternatively, he can switch on the fully automatic mode of operation.
MoMAS  offers a data base in which all process data including best recipes can be stored and retrieved. This includes the actual runs of extrusion rate and billet and profile tempe-rature for every extruded profile, besides the best values of process parameters corresponding to every order or die.

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MoMAS is provided with a language module which enables the language of display and dialog at the operator console to be set by selecting the desired language.

 

Choice of control input and modes of operation of MoMAS 


1. Ram velocity as control input
A billet temperature run is given as reference input to the furnace manually.
The billet temperature is measured before loading the billet into the container.
The optimal ram velocity is calculated using the measured billet temperature and
given as input to the velocity loop in PLC. The extrusion cycle is run by the PLC.

2. Ram velocity as control input with successive lowering of billet temperature
Extrusions are performed as above till the desired exit temperature is achieved.
The billet temperature is lowered by a pre-set value – say 5 C and the extrusions run.
The procedure is repeated till the allowed minimum billet temperature is reached.

3. Ram velocity and billet temperature as control input
A constant desired ram velocity is given by the operator. The billet temperature taper
run is calculated and given as reference input to the furnace temperature controls. The billet is heated and transported to the extruder.
The actual billet temperature is measured before introducing the billet into the container. The optimal ram velocity is calculated using the measured billet temperature and given as input to the velocity loop in PLC.