4M Process Introduction

GM 4M变更教程

1. What is 4M change4M = Man + Machine + Material + Method

Any change for the 4 aspects in suppliers should be reported out as 4M change. If the change follow GM formal process, such as EWO change procedure, or BTAB procedure, then no need follow 4M process

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GM 4M变更教程

2. 4M Change Process

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GM 4M变更教程

3. 4M Change ItemsMan Operator change

- Process/line: change more than 30%- Special process: key operator change

Temporary operator due to sudden accident Shift change

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GM 4M变更教程

3. 4M Change ItemsMachine New, replacement or modification for a facility

New/replacement for an inspection facility Product produced after the tooling has been inactive for volume production for 6 months or more A thorough overhaul of existing tooling or equipment Lay-out change of facility

Change trouble tooling to temporary tooling

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GM 4M变更教程

3. 4M Change ItemsMaterial Material change

Change of subcontractor for part or material Change the grade, color and combination ratio of material

Change the identification(Paint, label, marking, etc.) Change cleaner and anti-corrosive agent Change the packing(Protection cap, packing method and rack)

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GM 4M变更教程

3. 4M Change ItemsMethod Change process flow and operation method - Manual <=> Automatic - Baseline of processing standard and setting method - Spot welding <=> Arc welding Change process parameter - Operation standard and control standard - Change the forming temperature Change, delete, add and integrate the sequence of process flow

Production from tooling and equipment transferred to a different plant location or from an additional plant location Add/delete the cleaning operationGM Confidential

GM 4M变更教程

4. Important Things About 4M Change Make sure any change happens in supplier, which will have impact on parts or process, is reported out All 4M changes need to be approved by customers before implementation PTR is required if the change has potential impact on vehicle assembly

Clear “Break Point” shall be set up to identify parts with 4M change

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