How to Design Dies for Carbide Tooling

Introduction

Carbide dies require different design considerations than steel dies. Proper design maximizes carbide performance and prevents premature failure.

Generous Radii

Carbide is brittle, so sharp internal corners are stress concentrators. Use generous radii wherever possible to distribute stresses and prevent crack initiation.

Uniform Wall Thickness

Avoid abrupt section changes. Uniform wall thickness ensures even sintering and prevents stress concentrations during operation.

Adequate Support

Carbide should be fully supported in a steel retainer. Avoid point loading or unsupported spans. Steel backup rings contain expansion and prevent fracture.

Clamping Design

Use uniform clamping pressure. Avoid over-tightening bolts, which can crack carbide. Design clamping surfaces that distribute force evenly.

Grinding Access

Design for manufacturability. Ensure all surfaces can be ground or EDM accessible. Features that cannot be reached during manufacturing increase cost and lead time.

Conclusion

Good carbide die design accounts for the material properties of hardness and brittleness. Generous radii, uniform sections, adequate support, and proper clamping ensure reliable tooling.

References

GB/T 7714: GUPTA R, SONG J. Powder metallurgy processing and mechanical properties of cemented tungsten carbide composites[J]. International Journal of Refractory Metals and Hard Materials, 2020, 91: 105246.

APA 7th: Gupta, R., & Song, J. (2020). Powder metallurgy processing and mechanical properties of cemented tungsten carbide composites.

MLA 9th: Gupta, R., and J. Song. "Powder Metallurgy Processing and Mechanical Properties of Cemented Tungsten Carbide Composites."