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Assembly in two steps with PickAndPlace

Hello everyone,

I have a rather simple question, which I still coulnd`t find an answer for:

 

How can I realise an assembly in a specific order so that after the main part enters the assemby station first part A gets into the station (while part B can´t enter the station) and then when the main part and part A are in the station part B can enter.

 

Thanks!

7 REPLIES

Re: Assembly order

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor
the assemblyStation will wait for all parts in the assemblyList und move them to the station, after this the ProcTime starts. If you want to have a step-by-step assembly process, you could combine two AssemblyStations e.g. in a sub-frame.
Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Assembly order

 

I was trying to avoid using a sub-frame since that causes the material flow to get stuck when uing a pick-and-place robot. When using a normal assembly station I can make the robot stay at the assembly station so that this problem doesn't occure, but when using a network it seems to not work.

 

Is there a way to make the modell work with using a sub-frame?

(I have attached an example file.)

Re: Assembly order

Phenom
Phenom

@ Is there a way to make the modell work with using a sub-frame?

 

Yes (s.b. & attachment)

 

Please check the links to the frame and the assembly station parameters in your model.

 

Unbenannt.PNG

 

 

Re: Assembly order

Thanks for that suggestion. Unfortunately the problem is a bit more complex: The PickAndPlace that is connected to the two conveyors is handling the main part, that part A and parts B get assembled to.

 

(As explanation what is happening in reality: The PickAndPlace2 takes the main part from the conveyor and puts it into a assembly fixture, the PickAndPlace assembles part A, the PickAndPlace1 assembles part B and finally PickAndPlace2 takes the main part again an puts it back onto the conveyor system.)

 

Without using a sub-frame it's possible to make the third PickAnd Place to wait at the assembly station until something comes back. (Using the method:
if @.destination = XXXX then
  PickAndPlace2.setDestination( @.destination, true );
 else
  PickAndPlace2.setDestination( @.destination, false );
 end;
 
 print PickAndPlace2.getDestination;
))

 

But when using a sub-frame in order to realise an assembly of part A and part B in two seperate steps, this above mentioned method obviously doesn't work any more.

 

Maybe this is a bit too complex to model and I shoud just leave it as one assembly station, without using an sub-frame for a two step assembly. My hope was that there is a way to block the entrance of part B until part A is assembled. That indeed wouldn't be an accurate representation of reality, but at least consider the fact that part B cannot be assembled before part A.

 

 

Re: Assembly order

Phenom
Phenom

it is not too complex for plant simulation.

 

Unbenannt.PNG

Re: Assembly order

Thanks! Even though that doesn't handle the assembly in two seperate steps at least it controlls the assembly order.

Re: Assembly order

Phenom
Phenom

adding  another assembly station or increasing the CT  shoudn't be a problem for you