What does data for this category look like?
Typical data for this category comes from stamping workshops at automotive panel, household appliance sheet metal, and hardware component enterprises. Daily documents include stamping work instructions, material utilization rate sheets, mold inspection sheets, first/last piece records, dimensional inspection reports, and mold change records. Data sources include steel coil labels and quality certificates, punch and feeder operation data, mold management systems, MES systems, and coordinate measuring machine or fixture inspection data. Updates trigger when coil material, batch, or mold change operations occur. Each mold change or batch of materials uses a separate set of document records. Documents contain semi-structured tables, structured parameter records, and operation step text. Fields include mold number, blank holder force parameters, material grade, inspection dimensions, and more. There is no unified fixed full-text format.
What constraints do these characteristics impose on the document parsing and chunking stage?
Document characteristics in stamping and sheet metal forming scenarios create multiple constraints for parsing and chunking. First, semi-structured tables such as mold inspection sheets and material utilization rate sheets hold batch parameters. Chunking using fixed character counts will split parameter groups, preventing subsequent Q&A from linking complete information. Second, documents update frequently and have clear linked scenarios. Mold change records must bind to corresponding mold inspection records, so chunking must retain contextual connections. Third, documents from multiple sources have large format differences. These include standard PDFs exported from systems, and non-standard documents converted from scanned files. Parsing tools must support field extraction across different formats. Finally, errors directly impact production stability. Missing key parameters during chunking may make subsequent maintenance Q&A unable to provide accurate guidance.
How to configure settings
The following configurations are based on FastGPT v4.17.0 feature logic:
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Adapts to the semi-structured paragraph length of stamping work instructions and inspection records, avoiding splitting continuous parameters and operation steps |
chunkSplitter | Split by title + paragraph | Matches the hierarchical structure of stamping documents, retaining the association between titles and corresponding content for work instructions and inspection reports |
customPdfParse | Enable structured parsing mode | Extracts table fields from mold inspection sheets and dimensional inspection reports, avoiding splitting table content into scattered text |
UPLOAD_FILE_MAX_SIZE | 1000 MB | Meets the upload requirements for large-volume PDF files such as batch historical mold change records and multi-batch inspection reports |
PARSE_FILE_TIMEOUT_SECONDS | 600 seconds | Addresses time requirements for batch parsing of multiple documents, preventing mid-parsing timeouts for large files |
chunkSettingMode | Manual configuration | Adjust chunking parameters separately for different document types (such as work instructions vs. inspection reports) to optimize parsing results |
Three common configuration mistakes
- Phenomenon: After uploading a PDF of a stamping workshop's mold inspection sheet, direct chunking results show missing table fields and messy paragraph splicing. Cause: The structured parsing mode of
customPdfParseis not enabled, splitting semi-structured tables into scattered text and failing to retain complete parameter groups. - Phenomenon: When uploading a single stamping historical inspection report PDF larger than 500 MB, the parsing progress reaches 90% and prompts that the offset is out of range. Cause: The
UPLOAD_FILE_MAX_SIZEparameter is not adjusted, exceeding the system's default file size limit and causing parsing to interrupt. - Phenomenon: Uploading a mold change record via API versus directly uploading the same file via the platform results in inconsistent chunk content and quantity. Cause: The
chunkSettingModeconfiguration is not unified, and default chunking parameters differ between the API and platform, leading to mismatched chunking logic.
How to verify correct configuration
- Upload a single typical stamping document such as a mold inspection sheet, check if parsed chunks retain table fields and hierarchical titles, and verify structured parsing effects.
- Upload batch historical mold change record PDFs, confirm parsing progress completes fully with no offset out of range errors.
- Compare chunk results of the same document uploaded via API and the platform, confirm consistency in chunking logic and content.
- Adjust the
chunkSizeparameter, re-upload a stamping work instruction, check if paragraph splitting meets expectations, and optimize parameter values as needed.
The values provided are common starting points and should be measured against the reader's own samples.