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工模具业
- Tools & Dies Industry
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The
main phenomena limiting the useful lifetime of tools are frictional wear and
thermal fatigue in case of hot-work tools. The cost of wear is very high and
comprises not only a shorter working life due to premature failure, but also
downtime required to replace the worn part or tool. Gas nitriding increases the
surface hardness, reduces the coefficient of friction and creates at the surface
a zone of high compressive stresses. Therefore it is well placed to improve the
performance of cutting tools, but also in particular the performance of hot-work
tools, such as forging and extrusion dies. Nitreg® nitriding with its precise
control of surface concentration of nitrogen allows to obtain reproducible
properties of treated parts, and so a consistently high performance.
Types of applications
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Aluminum die casting dies
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Aluminum die casting sleeves
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Aluminum extrusion dies
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Ejector pins
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Forging dies
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Forming dies
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Plastic extrusion screws & other
related tooling
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Press dies
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Tool holder
Nitriding properties required:
high wear resistance, impact strength, and resistance to softening, high
dimensional stability.
Case study –
Drop-hammer forging blocks, made of H11 steel.
Nitreg® nitriding allowed a 100% increase
of pieces forged per run over blocks only hardened and tempered to 44/46 HRC.
Hot forge press die for A-arm suspensions
manufactured from an H13 block with Eurekalloy 660 flood weld. With Nitreg®
nitriding added to quenching and tempering, the productivity per treated die
rose from 10,000-12,000 suspensions to 25,000 minimum. Not only was the overall
productivity doubled but machine time was reduced by half.
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