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Effective way for conwip line process

Dear Community,

 

i'm facing a design problem with my model; i'm doing a study on conwip (constant work in process) and i simply need to pack an amount of MUs, 10 for example, in a box with a card and make it flows through the whole process.

The key point is that the 10 MUs, that at the beginning of the process were in the box, flows in that specified box for the whole production chain.

Of course the model is complex and in one specific department, for some reason i still have to understand, some MUs are placed in the next box.

So the question is: which is the more effective way, with simtalk, to be sure that the MUs starting from one box will be at the end of the process in the same box?

I was thinking about copying the contentslist of the box into an user defined attribute of the box itself but it seems complicated.

Thanks for your help.

6 REPLIES

Re: Effective way for conwip line process

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor
you could marry the box with the parts (e.g. if you create the parts in the box, write the object links into a list or a table inside the box).
Than you can check or search the right box, if you have some operations, where you remove the parts from the box (e.g. quality check, rework...) and put them later back into the box.
Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Effective way for conwip line process

Dear Steffen,

 

i've tried some solution but i'm not fully convinced. i'll try to explain which is my problem.Assy.pngConwip process

In the image you can see the 3 inline process that creates the problem: the ConWIP box (red line, see upper right corner for info) arrive in "Legatura" frame on "DismLegatura" process and here the ConWIP box are sent to the frame "Slegatura" and the 99 single MUs (yellow line, see upper right corner for info) are sent to "Legatura_buffer" until "Assembly_Fibbia"; in this station 12 single MUs of the same type are packed into a chassis (blue line, see upper right corner for info) and sent to the next frame "Galvanica".

Then they are sent to "Slegatura" frame and in "Slegatura" station the 12 MUs are unpacked from the chassis (that follow the blue arrow) and goes until "AssySlegatura" where they are packed again in the original box where they came from.

Here is the problem; sometimes some products have faster process and they are packed in a box that not belong to them.

So the question is: which is the most effective way, with simtalk, to pack the box with the same MUs?

Thank you so much.

 

 

Re: Effective way for conwip line process

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor
the same answer, marry them, make a list in the container with the parts (only for check) and make a user defined attribute in the part (container) and assign the container to the part, at the end store the containers for loading e.g. in a store and move the parts to @.container, the last part of the container moves the container to the next station, very easy
Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Effective way for conwip line process

Dear Steffen,

 

after some efforts i've found a way to make it work using the last part to move the container.

Unfortunately another logical software problem arise; in attach you'll find two files: the first one, named 09.02.18 - model (W) without failure, is working and if you start it you can see that everything is flowing.

However, to make it work, i had to deactivate the failure on the CNC machine in the frame CNC because, with failure on, some MUs can be delayed for the failure itself and some of them, not the last one of the lot, can be delayed compared to the MU of last lot.

To be more clear see the image below:MUs.png

Because of the CNC failure some MUs can came after the last lot's MU and therefore not loaded into the container so i cannot use only the information of the last MU to move the container away.

This is the question: considering that i have to use the failure to model the real world of the factory how can i move the container away if the last (numerical) MU of the lot, that can be or not the last of the lot itself, has to be loaded on the container?  

 

 

Re: Effective way for conwip line process

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

can you check the quantity of the lot? So you don't need for the last one, wait for the part that is completing the quantity

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Effective way for conwip line process

Dear Steffen,

 

that was the solution i came across to; i've the possibility so i will follow that way.

Thank you