High-stock roughing of hot or backup rolls
Separate the roughing stage from finishing. An Integral Brazed CBN insert is intended to address the higher impact exposure associated with interrupted engagement and variable stock conditions.
High-chromium cast iron, high-chromium steel, and alloy cast steel rolls hardened to HRC58–64 place demanding requirements on hard-turning tools. Interrupted cutting around roll shoulders, extended OD passes, wear-related dimensional drift, and groove-forming loads can each require a different insert capability.
UHD, the brand of Henan UHD Ultrahard Tools Co., Ltd, provides a process-layered CBN insert approach for roll manufacturing and roll refurbishment. Rather than relying on one insert type across every operation, the solution aligns CBN insert structure with the load, accuracy, and surface-quality requirements of each machining stage.
Typical workpieces include hot rolls, cold rolls, backup rolls, and straightening rolls. Critical features may include the roll body OD, journals, end faces, shoulder radii, lubrication grooves, locating grooves, and relief grooves. After heat treatment, these components combine high hardness with localized variations in cutting conditions.
Shoulder radii, joining marks, and non-uniform surface structures may create impact loads that concentrate stress at the cutting edge and increase the risk of edge chipping.
Long roll-body passes demand stable wear resistance across the effective cutting edge. Accelerated wear can lead to frequent insert changes and dimensional variation.
Finishing quality is influenced by edge condition, wear behavior, thermal stability, and the rigidity of the complete toolholding and machine system.
The objective is to match the insert to the operation instead of forcing a single grade or geometry to cover roughing, finishing, long-pass turning, and groove forming. This helps machining teams make clearer decisions around impact resistance, predictable wear, final roll-surface quality, and feature accuracy.
Selection principle: roughing prioritizes resistance to impact and fluctuating stock removal; finishing prioritizes consistent wear and surface quality; ultra-precision operations prioritize edge consistency; long OD passes prioritize usable cutting-edge length and wear life; groove operations require a dedicated profile and load-bearing structure.
| Machining stage | Recommended UHD CBN insert series | Typical roll features | Primary selection focus |
|---|---|---|---|
| Rough turning | Integral Brazed CBN Insert Series | Roll body OD, journals, shoulder radii | Stable material removal under interrupted cutting, stock variation, and impact load |
| Finish turning | Coated CBN Insert | Batch roll-body finishing | Wear consistency, thermal stability, and repeatable surface condition |
| Ultra-precision turning | Solid CBN Insert Series | Cold rolls and precision straightening rolls | Cutting-edge consistency for final geometric and surface-quality control |
| Long-distance OD turning | Full Face CBN Insert Series | Extra-long roll-body external diameters | Wear resistance and a cutting-edge configuration suited to long continuous passes |
| Groove forming | CBN Grooving Insert Series | Lubrication, locating, and relief grooves | Groove-profile control, concentrated-load stability, and chip evacuation |
Separate the roughing stage from finishing. An Integral Brazed CBN insert is intended to address the higher impact exposure associated with interrupted engagement and variable stock conditions.
For operations where cylindrical form and surface consistency are important, a Coated CBN insert provides a finishing-oriented option focused on stable wear behavior.
Solid CBN inserts can be considered for final machining of cold rolls or precision straightening rolls where a stable cutting edge is central to repeatable finishing results.
For long roll bodies, Full Face CBN inserts offer a dedicated route for managing sustained wear exposure and reducing interruptions associated with insert replacement.
Dedicated CBN grooving inserts support groove-specific machining where profile definition, edge reliability, and chip control should be evaluated as a separate operation.
Effective hard turning depends on more than insert material alone. UHD supports a selection workflow that considers the roll material and hardness, machining allowance, interrupted or continuous cutting condition, feature geometry, machine and clamping rigidity, and required final quality.
For HRC58–64 high-chromium roll hard turning, the practical objective is stable material removal in roughing, controlled wear in finishing, reliable final surface quality in precision machining, and dedicated support for long OD and groove operations. UHD combines CBN insert series with customized-tool capability and technical guidance to help roll manufacturers and machining facilities build a process suited to their actual operating conditions.
Tell us your workpiece, quantity, and tooling requirement. Our team will reply with a practical solution.
