The Importance of a Quality Traceability System
In 3D printing services, a quality traceability system is key infrastructure for ensuring product quality, enhancing customer trust, and responding to quality issues. A well-established traceability system can quickly identify the root cause of problems, clarify responsibility, and formulate improvement measures. It is an indispensable management tool for modern manufacturing service companies. This article systematically explains how to build a quality traceability system from four dimensions: batch management, node records, traceability links, and problem root-cause tracing.
Batch Coding Rule Design
Batch coding is the foundation of quality traceability and requires scientifically designed coding rules:
1. Coding Structure Design
A hierarchical coding structure is recommended:
- First layer: year and month (YYYYMM)
- Second layer: process type code (SLM/FDM/SLS, etc.)
- Third layer: material type code (such as Ti64/PA12/ABS, etc.)
- Fourth layer: batch serial number (three digits)
Example: 202608-SLM-Ti64-001 indicates the first batch of Ti64 material produced with the SLM process in August 2026
2. Batch Division Principles
- Powders/filaments of the same material and same batch are classified into the same batch
- Similar parts continuously produced on the same equipment are classified into the same batch
- Parts produced with the same process parameters are classified into the same batch
- Batch size control: metal printing no more than 10 kg per batch, plastic printing no more than 5 kg per batch
3. Identification Methods
| Location | Identification Method | Content |
|---|---|---|
| Raw material packaging | Self-adhesive label | Batch number, material grade, supplier, date |
| Printed parts | Laser marking / inkjet coding | Batch number-serial number, customer code |
| Process record sheet | Barcode / QR code | Batch number, process step, personnel, time |
| Inspection report | Electronic label | Batch number, inspection items, results |
Key Node Record System
1. Material Receiving Record
- Material batch number, supplier information
- Material certificates (material certificate, inspection report)
- Incoming inspection results (particle size distribution, oxygen content, etc.)
- Storage location and environmental condition records
2. Process Preparation Record
- Equipment number, status inspection record
- Process document version, parameter settings
- Raw material batch number, usage amount
- Operator, preparation time
3. Printing Process Record
- Printing start/end time
- Process monitoring data (temperature, oxygen concentration, powder spreading quality)
- Abnormal situations record (shutdowns, alarms, handling measures)
- Signatures of operator and monitoring personnel
4. Post-Processing Record
- Post-processing operation content
- Process parameters (temperature, time, pressure, etc.)
- Equipment number, operator
- Quality inspection results
5. Inspection Record
- Inspection items, inspection methods
- Inspection equipment number, calibration status
- Inspection results, determination conclusion
- Inspector, inspection date
6. Packaging and Shipping Record
- Packaging method, protective measures
- Shipping date, logistics information
- Customer receipt confirmation record
Methods for Establishing the Traceability Chain
1. Forward Traceability (from material to product)
Material batch → printing batch → part serial number → inspection record → shipping record
Purpose: when a raw material issue is found, quickly locate the affected parts and customers
2. Reverse Traceability (from product to material)
Part serial number → printing batch → process parameters → raw material batch → material certificate
Purpose: when a part has a quality issue, quickly locate the root cause
3. Traceability Information Management System
It is recommended to use an information-based management system:
- Barcode/QR code scanning input
- Automatic database linking
- Visual display of traceability paths
- Supports multi-dimensional query statistics
Methods for Root-Cause Analysis of Problems
1. Classification of Quality Issues
| Issue Type | Traceability Focus | Analysis Method |
|---|---|---|
| Dimensional out of tolerance | Process parameters, equipment status, measurement data | Parameter trend analysis, equipment capability analysis |
| Surface defects | Printing process, material condition, environmental conditions | Process data playback, material traceability |