All Round Performance.
The complete Hermes programme
for centreless grinding
Cylindrical workpieces such as tubes, rods, pistons or rollers made of steel, chrome-plated steel, stainless steel, titanium, aluminium or special alloys are ground on centreless grinding machines.
The machining steps required for centreless grinding depend on the initial condition of workpieces, on processing and on the final quality desired. In addition to dry grinding, grinding is primarily performed "wet", generally under an emulsion. Grinding temperature is reduced in wet grinding, resulting in grinding which is gentle on the workpiece, increases the tool life of grinding belts and significantly reduces grinding dust and noise.
For centreless grinding, Hermes supplies high-performance quality abrasives for the complete process:
They are characterized by the following product benefits:
- High stock removal rates
- Long tool life
- Constant roughness values
- Consistent and in some cases extraordinary grinding patterns
Product line
Initial grinding
During initial grinding, rough surface structures, weld seams or faults in the workpiece surface are ground. These faults may be due to production or transport. Possible faults include scratches, scoring, cracks, markings, oxidation, geometrical deformation or contamination.
Coarse grit sizes (24 to 60) are primarily used in initial grinding. The primary characteristics of Hermes belts for initial grinding are a high degree of grain sharpness and high stock removal rates. All products are equipped with highly durable backings and can be used in both dry and wet grinding applications (resistant to water, emulsion and oil).
Hermes abrasive belt programme for initial centreless grinding:
RB 377 YX
RB 486 44 Z
CR 456 Z
RB 377 YX
Durable standard product with a very tear-resistant polyester/cotton mix cloth backing
more information …RB 484 44 Z
High-performance zirconia alumina grinding belt with a very heavy, stiff polyester backingmore information …RB 486 44 Z
High-performance zirconia alumina grinding belt with active ingredients for cool grinding and with a very heavy, stiff polyester backingmore information …CR 454 Z
High-performance ceramic grain grinding belt with a very heavy, stiff polyester backingmore information …CR 456 Z
High-performance ceramic grain grinding belt with active ingredients for cool grinding and with a very heavy, stiff polyester backing, especially suitable for dry grindingmore information …
Intermediate grinding and economic finishing
Initial grinding produces flawless surface structures on the workpiece. In intermediate grinding, the initially ground surfaces are refined further using grinding belts in the medium to fine grit range (80 to 400).
Hermes can supply you with abrasives specially developed for centreless grinding: MERCURIT and HERMESIT high-performance grinding belts. The special three-dimensional structure of the abrasive grain guarantees you extraordinary grinding benefits:
- Consistent surface structure and roughness values, throughout the tool life
- Homogeneous surface structures such as those required for good corrosion resistance, for example
- 3 to 5 times longer tool life compared to conventional grinding belts reduces grinding belt change time and machine down time as well as the costs of disposing of used grinding belts >>> improved economy of your grinding process
The "MERCURIT" principle
Hermes developed the MERCURIT® grinding belt system specifically for centreless applications. In combination with MERCURIT® RB 590 Y (already established in our market) Hermes now can offer a full programme for intermediate grinding and economic finishing and polishing of cylindrical workpieces with the development of the new MERCURIT® RB 598 Y silicon carbide grinding belt.
Both types of grinding belt are based on a compact structure of grain agglomerate (the “MERCURIT® principle”) in which a large number of abrasive grains in one bonding mixture form the agglomerate. During grinding, new layers of grain are constantly exposed, giving MERCURIT® grinding belts an extremely long service life for consistent surface structures and roughness depths throughout the entire tool life of the grinding belt.
The "HERMESIT" principle
Hermes HERMESIT grinding belts have special hollow spheres coated with grain which break down evenly during grinding, but simultaneously keep exposing new abrasive grain.
HERMESIT grinding belts produce an extraordinary grinding pattern, the so-called “HERMESIT finish”. We recommend use on centreless grinding machines at low (HERMESIT RB 545 X) to medium grinding pressures
(HERMESIT 535 Y or RB 545 Y) .
These abrasives can be used universally in dry and wet grinding (resistant to water, emulsion and oil).
Hermes abrasive belt programme for intermediate centreless grinding:
MERCURIT RB 590 Y
MERCURIT RB 598 Y
HERMESIT RB 545 Y
MERCURIT RB 590 Y
Special high-performance abrasive belt with aluminium oxide grain for wet grinding applications and for grinding at high grinding pressuresmore information ...- MERCURIT RB 598 Y
Special grinding belt with silicon carbide grain for finishing and polishing with centerless applications, especially suitable for grinding at low or moderate grinding pressures
more information ... HERMESIT RB 535 Y
Aluminium oxide abrasive belt for producing the bright matt HERMESIT-Finish at medium grinding pressuresmore information ...HERMESIT RB 545 Y
Silicon carbide abrasive belt for producing the bright HERMESIT-Finish at medium grinding pressuresmore information ...HERMESIT RB 545 X
Silicon carbide abrasive belt for producing the bright matt HERMESIT-Finish at low grinding pressuresmore information ...
Special Finishing
The finest possible surfaces with defined roughness values are a prerequisite for producing satinized surfaces, high-polish or so-called “mirror finishes”.
Defined surface qualities are also required for certain applications or downstream steps such as chromeplating or anodizing, for example.
Hermes supplies a variety of quality abrasives (grit 400 and finer) for this grinding step:
- Cork polishing belts
- webrax Abrasive web belts
- webrax Abrasive web convoluted wheels
- microlite wheels
Cork polishing belts
RB 515 X
Cork polishing belts allow "cushioned" grinding and produce a polishing effect as a result of the elastic particles of cork. These products are characterized by long tool life and can be used universally in dry and wet grinding (resistant to water, emulsion and oil).
RB 515 X
Cork polishing belt with silicon carbide abrasive grain for producing high-polish or "mirror-finish" surfaces with fine-structured patternmore information ...RB 515 Y
Very tear-resistant Cork polishing belt with silicon carbide abrasive grain for producing high-polish or "mirror-finish" surfaces with fine-structured patternmore information ...RB 525 X
Cork polishing belt with aluminium oxide abrasive grain for producing bright matt surfaces with fine-structured patternmore information ...RB 555 X
Cork polishing belt without abrasive grain for producing high-polish or "mirror-finish" surfacesmore information ...
webrax Abrasive web belts
webrax-AN 701 50
webrax-PN 721
webrax abrasive web belts are manufactured from special fibre web in combination with a cloth backing. The grain is firmly anchored in the web by a bond and is correspondingly durable. These abrasives can be used universally in dry and wet grinding (resistant to water, emulsion and oil).
webrax-AN 701 50
Abrasive web for structural grinding of stainless steelmore information ...webrax-PN 721
Abrasive web without abrasive graine for cleaning and polishing stainless steel surfacesmore information ...
webrax Abrasive web convoluted wheels
webrax-OA 710 GWS
The high interlayer strength of webrax Abrasive web convoluted wheels produces an optimum web finish. These abrasives can be used universally in dry and wet grinding (resistant to water, emulsion and oil).
webrax-OA 710 GWS
Abrasive web convoluted wheel with aluminium oxide abrasive grain for producing bright matt surfacesmore information ...webrax-OS 715 GWS
Abrasive web convoluted wheel with silicon carbide abrasive grain for producing bright surfaces, finer surface pattern in comparison to webrax-OA 710 GWSmore information ...
microlite Polishing wheels
microlite Polishing wheels
Hermes microlite wheels are elastic and their outstanding adaptability makes them especially suitable for fine-grinding whilst meeting the most stringent standards with regard to brightness and fineness of workpiece surfaces ("mirror-finish").
A polyurethane-based bond incorporating silicon carbide grain is foamed by special processes to form microlite wheels of varying elasticity. In many cases, the use of microlite wheels when fine-grinding allows working steps to be saved and increases the productivity and economy of your process.
In addition to use in dry-grinding, microlite wheels are resistant to water, emulsion and oil and can therefore also be used in wet grinding.
