Value Stream Mapping

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  • Topic: Value stream mapping, Lean manufacturing, Business process mapping
  • Pages : 15 (4257 words )
  • Download(s) : 326
  • Published : December 30, 2012
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Table of Contents
1.1.What is Value Stream Mapping (VSM)1
1.2.When to use Value Stream Maps2
2.1.VSM Line Conventions4
2.2.VSM Symbol And Definition6
2.2.1.VSM Process Icons6
2.2.2.VSM Material Icons7
2.2.3.VSM Information Icons8
2.2.4.VSM Miscellaneous Icons9
3.1Objective of Using Value Stream Mapping10
3.2Designing Flow of Value Stream Mapping11
3.2.1.Current State Value Stream Mapping (CSVSM)12
3.2.2.Future State Value Stream Mapping (FSVSM)17

2.1. What is Value Stream Mapping (VSM)
Value Stream Mapping (VSM) is a visualization tool oriented to the Toyota version of Lean Manufacturing (Toyota Production System). It helps to understand and streamline work processes using the tools and techniques of Lean Manufacturing. The primary objective of VSM is to identify and demonstrate the flow of process to decrease a waste. VSM also can aid engineers, management, suppliers to recognize the waste and eliminate it. Waste is not value added for a company. It needs to be eliminated to reduce cost and improve the company business. This VSM is primarily to eliminate the 7 waste that occurred in the company such as overproduction, waiting, transport, inappropriate processing, unnecessary inventory, unnecessary motion, and defects. As the focus of the value stream includes the complete value adding (and non-value adding) process, from conception of requirement back through to raw material source and back again to the consumer’s receipt of product, there is a clear need to extend this internal waste removal to the complete supply chain. This waste can be eliminated when the VSM is constructed. The VSM will have all details needed to overcome this waste. In addition, the Mapping contains the cycle time (CT), down time, in-process inventory, material moves, information flow paths, order quantity, lead time, stock available and many more. This Mapping will show the travel of the product from the supplier to the customer. This will assist the company to manage the process of the product efficiently towards the future desire state without the waste. Through Value Stream Mapping, a team of employees can map the current state from customer back to raw material including all steps, both value-added and non-value-added, and develop a future state vision to act as a blueprint for Lean activities. The Future State often represents a significant change compared to the way the company currently operates. The VSM team will develop an implementation strategy to make the Future State a reality. The most urgent needs will be addressed first, and can typically be accomplished in a very short time frame with the appropriate resources applied.

2.2. When to use Value Stream Maps
There is no mapping techniques that fits every situation and purpose in the industry but the VSM techniques is the best application to such high-volume, low variety product that mixes with few components and subassemblies and dedicated equipment. Table 1 : Application of VSM

| Applies| May Not Apply|
Volume| High-Volumes| Low volumes may be problematic|
Variety| Low variety| High variety|
Equipments| Dedicated equipments| Multiple shared equipments| Routings| Simple routings| Complex routings|
Components| Few| Many parts & sub-assemblies|
Strategy| Toyota Production System| Non-Toyota & Variations of Toyota|

1. Volume – the VSM is the best for the high volume production because the low volume often is associated with erratic demand, complex routings and shared equipment that are often problematic.

2. Variety – the variety process will make the Value Stream Maps become clumsy and complex. But there are situation where there are high variety from...
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