This document is compatible with FastGPT v4.17.0.
What the data for this category looks like
Documents for this category mainly come from steel coil labels and quality certificates, punch and feeder data, mold management systems, MES systems, coordinate measuring machine inspection data, and similar sources. Daily documents include stamping work instructions, material utilization rate tables, mold inspection logs, first/last piece records, dimensional inspection reports, mold change records, and similar items. Documents are updated per coil of material, per batch of materials, or each time a mold is changed. Most documents have structured tables and step-by-step process descriptions. Fields cover material grades, material thickness, mold numbers, blank holder force parameters, inspection dimensions, and similar items, with industry-standard unit identifiers.
What constraints these characteristics impose on document parsing and chunking
The update frequency of documents in this category is tightly bound to business batches. Chunking must match business units such as mold changes and material coils, to avoid splitting associated data across batches. Structured table documents, such as material utilization rate tables, must retain row and column correspondence, and must not split only by characters, which would cause field misalignment. Parsing time varies greatly between short documents, such as a single mold change record, and long documents, such as a full workshop monthly inspection log. Processing must be adapted for files of different lengths. At the same time, process description documents must retain continuous process logic, to avoid splitting associated content of key steps such as drawbead debugging and blank holder force adjustment, to ensure complete context during cross-review.
How to set configurations
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
chunkSize | 800–1200 characters | Matches the combined length of single process parameters and corresponding inspection results in stamping documents, to avoid splitting key process descriptions |
chunkSplitter | Custom separators + paragraph line breaks | Adapts to the step-by-step layout of stamping work instructions, retaining complete logic for individual processes |
customPdfParse | Enable table extraction mode | Accurately parse structured fields in material utilization rate tables and dimensional inspection reports |
PARSE_FILE_TIMEOUT_SECONDS | 300 seconds | Handles parsing of large documents including multiple batches of mold change records and full workshop inspection data |
UPLOAD_FILE_MAX_SIZE | 1000 MB | Adapts to large file uploads such as steel coil quality certificates and consecutive days of punch operation logs |
chunkSettingMode | Manual configuration mode | Flexibly adjust chunking rules for different document types (work instructions, inspection reports, mold change records) |
Three common mistakes
- Phenomenon: After setting
chunkSplitterto a custom separator, chunking results either merge multiple independent process paragraphs or split a single process description into multiple chunks. Cause: The segment markers actually used in stamping documents, such as mold change numbers and material coil batch numbers, are not matched, and relying only on generic line breaks causes the chunking logic to not match business units. - Phenomenon: An error is returned when processing stamping-related PDF documents after Docker deployment, with an error message containing
detail. Cause: Environment variables related tocustomPdfParseare not configured correctly, or the uploaded file exceeds theUPLOAD_FILE_MAX_SIZElimit, causing the parsing process to interrupt. - Phenomenon: Chunked content cannot be associated with the specific batch or mold source of the document. Cause: Structured data extraction mode is not enabled, causing traceability fields such as batch numbers and mold numbers in the document to not be fully retained in the chunked content.
How to confirm the configuration is correct
- Upload a single stamping work instruction PDF, check the chunking preview interface, and confirm that the complete description of a single process is not split or merged.
- Upload a material utilization rate table containing tables, check whether the chunked results retain complete table rows and corresponding values.
- Test uploading a single mold change record document of around 100 MB, confirm that the parsing time does not exceed the
PARSE_FILE_TIMEOUT_SECONDSsetting, and no timeout error occurs. - Verify that the chunked content includes business fields such as material coil grades and mold numbers, to ensure complete traceability information.
The values provided are common starting points and should be measured against the reader's own samples.