What is the difference between pull nad push manufacturing processes?

Hello madamico-ga and thanks for your question.


"Push" and "pull" manufacturing are terms of art used by "lean
manufacturing" practitioners.

A good introduction to lean manufacturing,and all its major terms, can
be found at:

http://www.scodanibbio.com/site/access/lmintro.html

The third bullet on the page introduces push and pull:

The "push" and "pull" productive methods (--> read more about)

Clicking on the "read more about" will take you to an in-depth
description with illustrations of the diffeences:
------------------------------

THE PUSH AND PULL PRODUCTIVE METHODS 

In a push production method, workpieces manufactured by a previous
process are transferred ("forced transfer") to the next process
irrespective of its readiness to receive and process those workpieces.
This normally generates WIP - work in progress.

It is well possible and normal that several batches of workpieces
produced by different previous processes "pile-up" and queue before
being processed by the downstream process.

Consequently, there is a time gap and an associated "localisation"
problem between two consecutive production processes.

Because of this, manufacturing planning becomes very sophisticated and
requires specialised tools such as RVP - Required Volume Planning,
MRP1 - Materials Requirement Planning, MRP2 - Manufacturing Resources
Planning, and the like.


In a pull production method, next process down "pulls" from the
previous process just what needed, only when needed, and in the
quantity needed.
Nothing happens upstream unless something happens downstream.

The value-chain principle is fully implemented: there is a
supplier-client relationship between upstream and downstream
processes.

Production planning is simpler, immediate, fit for human beings. 

-------------------------------

I hope this is the information you need, but if anything here requires
elaboration, just let me know by posting a Request for Clarification,
and I'll be glad to assist you further.


search strategy:  Google search for "lean manufacturing" "push and
pull"