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VSM Symbols

Symbols used to create a Lean Value Stream Map (VSM) using the VSM symbols
by

Mike Abney

on 2 May 2010

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Transcript of VSM Symbols

This icon represents the “pushing” of material from one process to the next process. Push means that a process produces something regardless of the immediate needs of the downstream process. Push Arrow Supermarkets connect to downstream processes with this "Pull" icon that indicates physical removal. Material Pull Go See Gathering of information through visual means. This icon goes under other icons that have significant information/data required for analyzing and observing the system. Typical information placed in a Data Box underneath FACTORY icons is the frequency of shipping during any shift, material handling information, transfer batch size, demand quantity per period, etc. Data Box 1 Data Box 2 This icon is a tool to batch kanbans in order to level the production volume and mix over a period of time Load Leveling These icons show inventory between two processes. While mapping the current state, the amount of inventory can be approximated by a quick count, and that amount is noted beneath the triangle. If there is more than one inventory accumulation, use an icon for each.
This icon also represents storage for raw materials and finished goods.
or This icon represents the Supplier when in the upper left, the usual starting point for material flow.
The customer is represented when placed in the upper right, the usual end point for material flow.
Inventory Customer/Supplier This symbol indicates that multiple processes are integrated in a manufacturing workcell. such cells usually process a limited family of similar products or a single product. Product moves from process step to process step in small batches or single pieces. Workcell These icons are used to highlight improvement needs and plan kaizen workshops at specific processes that are critical to achieving the Future State Map of the value stream. Kaizen Burst This wiggle arrow represents electronic flow such as electronic data interchange (EDI), the Internet, Intranets, LANs (local area network), WANs (wide area network). You may indicate the frequency of information/data interchange, the type of media used ex. fax, phone, etc. and the type of data exchanged. Electronic Info Scheduling using MRP/ERP or other centralized systems. MRP/ERP A straight, thin arrow shows general flow of information from memos, reports, or conversation. Frequency and other notes may be relevant. Manual Info A location where kanban signals reside for pickup. Often used with two-card systems to exchange withdrawal and production kanban. Kanban Post This icon represents an operator. It shows the number of operators required to process the VSM family at a particular workstation. Operator This icon represents a pull system that gives instruction to subassembly processes to produce a predetermined type and quantity of product, typically one unit, without using a supermarket. This icon triggers production of a pre-defined number of parts. It signals a supplying process to provide parts to a downstream process. Sequenced Pull Production Kanban This box represents a central production scheduling or control department, person or operation. Production Control This is a process operation, department or workcenter that other value stream families share. Estimate the number of operators required for the Value Stream being mapped, not the number of operators required for processing all products. Shared Process This icon is a process, operation, machine or department, through which material flows. Typically, to avoid unwieldy mapping of every single processing step, it represents one department with a continuous, internal fixed flow path.
In the case of assembly with several connected workstations, even if some WIP inventory accumulates between machines (or stations), the entire line would show as a single box. If there are separate operations, where one is disconnected from the next, inventory between and batch transfers, then use multiple boxes.
Other useful or potentially useful information. Other This icon represents verbal or personal information flow. Verbal Information This icon is used whenever the on-hand inventory levels in the supermarket between two processes drops to a trigger or minimum point. When a Triangle Kanban arrives at a supplying process, it signals a changeover and production of a predetermined batch size of the part noted on the Kanban. It is also referred as “one-per-batch” kanban. Signal Kanban This icon represents an inventory “hedge” (or safety stock) against problems such as downtime, to protect the system against sudden fluctuations in customer orders or system failures. Notice that the icon is closed on all sides. It is intended as a temporary, not a permanent storage of stock; thus; there should be a clearly-stated management policy on when such inventory should be used. Safety Stock This icon represents movement of raw materials from suppliers to the Receiving dock/s of the factory. Or, the movement of finished goods from the Shipping dock/s of the factory to the customers Shipments This icon represents a card or device that instructs a material handler to transfer parts from a supermarket to the receiving process. The material handler (or operator) goes to the supermarket and withdraws the necessary items. Withdrawal Kanban This is an inventory “supermarket” (kanban stockpoint). Like a supermarket, a small inventory is available and one or more downstream customers come to the supermarket to pick out what they need. The upstream workcenter then replenishes stocks as required.
When continuous flow is impractical, and the upstream process must operate in batch mode, a supermarket reduces overproduction and limits total inventory.
Process Typical information in a Data Box underneath MANUFACTURING PROCESS icons: · C/T (Cycle Time) - time (in seconds) that elapses between one part coming off the process to the next part coming off, · C/O (Changeover Time) - time to switch from producing one product on the process to another · Uptime- percentage time that the machine is available for processing · EPE (a measure of production rate/s) - Acronym stands for "Every Part Every___". · Number of operators - use OPERATOR icon inside process boxes · Number of product variations · Available Capacity · Scrap rate · Transfer batch size (based on process batch size and material transfer rate) Supermarket Shipments from suppliers or to customers using external transport. External Shipment Before... Before... After Leaning it out...
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