锌合金压铸小孔公差控制案例
XSD Precision engineering resource for Zinc Die Casting Small Hole Tolerance Control Case Study 5.95mm vs 5.90mm, covering TPMS buyer checks, validation points, sourcing.
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XSD Precision engineering resource for Zinc Die Casting Small Hole Tolerance Control Case Study 5.95mm vs 5.90mm, covering TPMS buyer checks, validation points, sourcing.
Tolerance Reality for Small Die Castings
| Material / Control Level | Realistic Production Tolerance | Engineering Meaning |
|---|---|---|
| Zinc alloy small parts | Around ±0.05mm for ordinary stable production | Realistic for normal mass production when the mold, machine and measurement system are stable. |
| Zinc alloy with good control | Around ±0.03mm | Requires better mold precision, stable mold temperature and stricter measurement discipline. |
| Zinc alloy high-precision target | Within ±0.02mm | Difficult. Usually requires high-precision mold inserts, stable thermal control, strict inspection, and sometimes post-machining or 100% sorting. |
| Aluminum alloy small parts | Around ±0.08-±0.15mm for ordinary stable production | Aluminum die casting has greater shrinkage and thermal variation, so long-term ±0.03mm control is difficult. |
Case Measurement
| Item | Measured Value | Interpretation |
|---|---|---|
| Sample hole size | 5.95mm | Reference size for comparison. |
| Cavity 1 raw casting | 5.95mm | Matches the sample dimension. |
| Cavity 2 raw casting | 5.90mm | 0.05mm smaller than cavity 1. |
| Cavity difference | 0.05mm | Acceptable for many 88T zinc die casting conditions, but worth correcting if this is a key assembly dimension. |
How to Judge the Cause
Correction Priorities
- Measure at least 30-50 pieces per cavity before cutting steel; separate data by cavity number.
- If the difference is stable, correct cavity 2 insert size or shutoff surface rather than adjusting the whole process.
- Check gate balance, runner pressure loss and local filling sequence if cavity 2 is both smaller and lighter.
- Check mold temperature at both cavities because a local temperature difference can change shrinkage and final hole size.
- Confirm measurement method, gauge repeatability and operator consistency before deciding mold correction amount.
- If the hole is a critical assembly feature, reserve post-machining, reaming or 100% sorting as the control plan.
Conclusion: for an 88T zinc die casting project, holding a 5.95mm small hole around ±0.05mm is realistic. If two cavities must be controlled within 0.02-0.03mm, the work should focus on cavity correction, runner balance and mold-temperature stability, not only machine parameter adjustment.
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