What the Data for This Category Looks Like
Core data for sheet metal cutting and bending originates from CAD/CAM software, order BOMs, sheet inventory systems, laser cutters, bending machines, and MES systems. Updates occur per order, daily production schedule, or each mold changeover. Daily documentation includes part unfolding drawings, CNC cutting programs, bending process cards, nesting planning diagrams, first-piece inspection records, and process flow cards. Data fields cover engineering parameters such as sheet thickness, bending coefficient, cutting size, and bending angle, with units primarily millimeters and degrees.
Constraints on Multi-turn Dialogue and Prompt Engineering
Multi-source, heterogeneous document formats require multi-turn dialogue to gradually clarify parameters, preventing process verification errors from inconsistent formatting. Frequently updated order and production data requires dialogue context to retain real-time linked BOM and inventory information, cutting down repeated input. For production models with multiple varieties and small batches, process parameters differ sharply across orders. The messages context must preserve historical questions and confirmation results to avoid mixing up bending compensation values for different parts. Additionally, the specialized nature of engineering data means prompts should guide breakdown of complex process problems and split multi-turn interaction steps.
How to Set Configurations
| Configuration Item | Recommended Setting | Rationale |
|---|---|---|
| Maximum Context Length | 8000–12000 characters | Matches the total length of sheet metal process documents and multi-turn questions, avoiding truncation of critical parameters such as bending coefficients and cutting sizes |
| Single Recap Count | Top 4 entries | Matches the number of process documents associated with a single order, avoiding retrieval of irrelevant data for multiple part varieties |
variables Variable Binding | Bind order BOM and sheet inventory variables | Links real-time production data sources, ensuring parameters called during dialogue match the current production task |
| Session Timeout | 300 seconds | Matches the rhythm of multi-turn interactions for process verification, preventing parameter loss from mid-interaction disconnection |
messages Context Retention | Retain the last 10 dialogue turns | Ensures confirmed parameters such as bending compensation and nesting planning are not lost during multi-turn interactions |
chatId Association Configuration | Bind the current session ID | Distinguishes process dialogues for different orders, avoiding parameter confusion |
Three Common Misconfigurations
- Symptom: Debug preview operates normally, but an error indicating no associated knowledge base data appears after official release. Cause: The production environment did not correctly bind the order BOM and production data sources corresponding to
variables, with only temporary variables configured in the preview environment. - Symptom: When entering long text containing unfolding drawing data, the dialogue returns truncated and incomplete process information. Cause: The maximum context length configuration was not adjusted, and the default threshold is insufficient to accommodate detailed parameters of sheet metal drawings.
- Symptom: The same bending coefficient parameter is repeatedly asked during multi-turn dialogue. Cause: The
messagescontext retention function was not enabled, and session parameters were reinitialized for each question.
How to Verify Proper Configuration
Under FastGPT v4.17.0, complete these verification steps:
- Input a description of a specific part’s unfolding drawing, confirm the dialogue retrieves the corresponding bending process card and nesting planning data.
- Switch between different order BOM variables, verify that displayed sheet inventory and cutting parameters update with the variable changes.
- Launch multiple consecutive questions, confirm the context linked to
chatIdis not cleared and historically confirmed parameters are retained. - Test the session timeout scenario, confirm multi-turn interactions initiated within 300 seconds are not automatically disconnected.
The values provided here are common starting points, and should be evaluated against the reader's own samples.