What the data for this category looks like
Daily documents for stamping and sheet metal forming scenarios include stamping work instructions, material utilization rate sheets, mold inspection logs, first/last piece records, dimensional inspection reports, and die change records. Data sources include steel coil labels and quality certificates, press and feeder operation data, mold management systems, MES systems, and coordinate measuring machine or fixture inspection data. Update frequency aligns with production batches. Corresponding documents are generated for each coil of material, each batch of workpieces, and each die change. Documents contain fixed fields such as mold model, blank holder force value, sheet thickness, and inspection dimensions. Most units are millimeters and tons.
What constraints these characteristics impose on document parsing and chunking
Multi-source heterogeneous data sources and high-frequency updates require document parsing to adapt to different production document formats, and avoid missing cross-system associated field information. Fixed-field and unit-based document structures require chunking to retain complete parameter combinations for a single production batch, and avoid splitting critical process data. High-volume, frequently generated documents require parsing and chunking workflows to support rapid processing, and avoid errors in subsequent links caused by timeouts or improper chunking. Structural differences across document types require parsing rules to be flexibly adjusted, to match the format characteristics of work instructions, inspection reports, and other production documents.
How to Set Configurations
The following configurations are based on FastGPT v4.17.0:
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Adapts to the field length of process parameters and batch records in stamping process documents, and avoids splitting complete parameter combinations for a single production batch |
chunkSplitter | Split by paragraph + table block | Corresponds to structured content in mold inspection logs and die change records, and preserves the relational integrity of data within tables |
customPdfParse | Enable structured parsing mode | Adapts to fixed-layout PDFs such as steel coil labels and quality certificates, and accurately extracts fixed fields such as steel grade and sheet thickness |
PARSE_FILE_TIMEOUT_SECONDS | 120 seconds | Addresses the time required for multi-system data integration during batch document parsing, and avoids interruptions due to timeout during parsing |
UPLOAD_FILE_MAX_SIZE | 500 MB | Adapts to the common size of individual stamping process documents, and avoids upload failures caused by oversized files |
chunkSettingMode | Manual configuration | Flexibly adjust chunking rules for different document types such as work instructions and inspection reports |
Three Common Misconfigurations
- After uploading a material utilization rate sheet, only the header is captured with no data rows. Cause: Structured table parsing mode for
customPdfParseis not enabled. The default general parsing cannot recognize the fixed column structure of stamping industry tables. - After uploading a stamping work instruction, the parsing node shows timeout and no response. Cause: The
PARSE_FILE_TIMEOUT_SECONDSparameter is not adjusted. The default value is insufficient for processing documents with cross-system associated data. - Fields from adjacent die change records are split into different chunks after chunking. Cause: The
chunkSizesetting is too small, splitting the complete parameter combination for a single batch of die changes.
How to Verify the Configuration is Correct
- Upload a single mold inspection log, and check if parsed chunks retain complete fields including inspection date, mold number, and wear amount.
- Upload a batch of die change record documents, and confirm that parsing time does not exceed the set value of
PARSE_FILE_TIMEOUT_SECONDS. - Verify that under structured parsing mode, steel grade and thickness fields from steel coil quality certificates are accurately extracted.
- After adjusting
chunkSize, check that process parameters for the same batch are not split into different chunks.
The values provided are common starting points and should be measured against the reader's own samples.