Advanced finishing strategies for hardened tool steels

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00387975" target="_blank" >RIV/68407700:21220/25:00387975 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Advanced finishing strategies for hardened tool steels

Popis výsledku v původním jazyce

High demands for precision and mirror-like surfaces in mold manufacturing have led to the development of advanced finishing strategies for hardened tool steels. This paper investigates the potential of precision milling using cubic boron nitride (CBN) and polycrystalline diamond (PCD) tools for achieving ultra-smooth surfaces while minimizing manual polishing. A comprehensive experimental study was conducted on maraging steel Böhler W720 VMR (54 HRC), evaluating the influence of feed rate and depth of cut on surface roughness. While CBN tools enabled the attainment of Ra values below 30 nm, mirror finishes required additional finishing processes. Various supplemental technologies including manual, orbital, electrochemical, and CNC-based PCD polishing were compared in terms of surface quality and process efficiency. The most cost-effective approach was found to be CBN milling under productive conditions followed by manual or orbital polishing, yielding sub-5 nm roughness on planar surfaces. PCD polishing proved effective in reducing longitudinal roughness but did not consistently achieve a reflective surface due to machine kinematic limitations. The findings provide practical guidelines for selecting and combining finishing strategies to optimize both surface quality and production cost in hardened tool steel applications.

Název v anglickém jazyce

Advanced finishing strategies for hardened tool steels

Popis výsledku anglicky

High demands for precision and mirror-like surfaces in mold manufacturing have led to the development of advanced finishing strategies for hardened tool steels. This paper investigates the potential of precision milling using cubic boron nitride (CBN) and polycrystalline diamond (PCD) tools for achieving ultra-smooth surfaces while minimizing manual polishing. A comprehensive experimental study was conducted on maraging steel Böhler W720 VMR (54 HRC), evaluating the influence of feed rate and depth of cut on surface roughness. While CBN tools enabled the attainment of Ra values below 30 nm, mirror finishes required additional finishing processes. Various supplemental technologies including manual, orbital, electrochemical, and CNC-based PCD polishing were compared in terms of surface quality and process efficiency. The most cost-effective approach was found to be CBN milling under productive conditions followed by manual or orbital polishing, yielding sub-5 nm roughness on planar surfaces. PCD polishing proved effective in reducing longitudinal roughness but did not consistently achieve a reflective surface due to machine kinematic limitations. The findings provide practical guidelines for selecting and combining finishing strategies to optimize both surface quality and production cost in hardened tool steel applications.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Technological Forum2025

ISBN

978-80-87583-57-9

ISSN

—

e-ISSN

—

Počet stran výsledku

8

Strana od-do

110-117

Název nakladatele

Ing. Jan Kudláček

Místo vydání

Jaroměř

Místo konání akce

Herbertov

Datum konání akce

24. 6. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—