Hot Cutting Circular Saw Blades
Extraordinary blade life – with the least tendency to crack!
BLECHER hot cutting circular saw blades are the specialists for the rough parting of hot steel items at above 700°C. Numerous particular processing methods and greatest care during manufacturing guarantee top performance at extra demanding requirements for the cutting of bars, billets, rails, sections, tubes and profiles. It is used with stationary sawing plants in hot rolling mills and extrusion lines and diameter up to 2,500mm.
Tooth forms
- 30°/30° pendulum tooth (standard)
- T18 special tooth with double radius
- 30°/30° pendulum tooth with flatland
- slant teeth
- forged teeth
Saw blade material:
BL60 is a BLECHER exclusive, unique material for best possible blade life at least possible tendency to cracking (for tooth tip hardened blades). Other materials with carbon content as given by the application (the Carbon content determines hardness = blade life and its tendency to crack by a large amount):
- 75 Cr 1 (1.2003) standard for smaller diameters, hardened and tempered all over, C = 0.78%
- BLECHER special steel grades BL50, BL55 and BL80 for all diameters, alloys optimized for long blade life and low addiction to cracking
Typical main dimensions
| Diameter mm | Kerf mm | Teeth | Tooth Spacing mm |
|---|---|---|---|
| 680 | 6 | 180 | 6,63 |
| 780 | 6 | 280 | 8,75 |
| 900 | 7 | 300 | 9,42 |
| 1000 | 8 | 260 | 12 |
| 1200 | 8 | 314 | 12 |
| 1600 | 10 | 500 | 10 |
| 1800 | 12 | 470 | 12 |
| 2000 | 12 | 524 | 12 |
| 2200 | 14 | 384 | 18 |
| 2500 | 16 | 436 | 18 |
Conditions of application:
- Vary with the machine used and workpieces to be cut
- Cutting speed: 110-150 m/s
- Feeding speed: approx. 1000-3000 mm2/s
- Cooling: high pressure cooling with water
Sawing machine:
Stationary horizontal cut-off-saws by e.g. Abbey Etna, Kocks, Mannesmann,Schloemann-Siemag, Danieli-Morgardshammar, Koch-HK, SMS-Meer, Wean United, etc.
Finish of side faces:
- Black rolled (standard) finish = side faces of saw blade not ground for moderate cutting clearance, BLECHER always balances also black rolled saw blades!
- flat ground finish = side faces of saw blade parallel ground upon customer request
- hollow ground and off-set finish: side faces are hollow ground, optionally off-set ground and balanced after flat grinding; for maximum cutting clearance, reduce burr forming and high cut quality
BLECHER QualitY Features
Application oriented selection of blade materialSpezielle Werkstoffauswahl
Material selection from a wide range of different alloys and characteristics for application dependent wear life, hardness, stability and toughness, e.g. 51Mn7mod., 75Cr1, 80CrV2, 73WCrMoV2-2, X155CrVMo12-1, S 6-5-2, BLECHER proprietary steel grades BL50, BL55 & BL60/BL80
100% Made in Germany
All materials used for BLECHER saw blades have been made in Germany
Individual tooth geometries
Tooth and cutting edge geometry optimized to each customer-specific application
Tempering with multiple annealing
Technically matured annealing processes with most advanced furnaces, for hardening and (where appropriate multiple) tempering
Cool Grinding
In-house developed “cool grinding” technology with most modern PLC controlled grinding machines reduce heat impact during processing and avoid unwanted residual stress
BLECHER flame hardening process
In-house developed flame hardening process anneals tooth tips to the highest possible hardness degree without embrittlement and by keeping the material´s toughness, tooth gullets remain without heat impact
Consistent documentation
Consistent documentation of all use materials, manufacturing steps and measuring results including from final inspection for each production job
Highest environmental standards
Technically matured annealing processes with most advanced furnaces, for hardening and (where appropriate multiple) tempering
BLECHER hammering process
A proprietary hammering and straightening process results in highest precision and smallest side run-out even across multiple service cycles
Thermal stress relieve
Blades are thermally stress relieved to eliminate uncontrollable and unwanted residual stresses from the material rolling process which potentially can create performance deviations during use
Thermochemical platings
Thermos-chemical platings and hard material coatings available for higher cutting speeds and reduced wear
Optimized tooth gullet radii
Milled teeth with consistent precision and tooth gullet radii optimized to virtually no cracking
BLECHER balancing process
Advanced balancing methods produce best possible true running results at high blade speeds for tools with non-parallel sides (hollow or bevel ground)
Controlled tensioning
Targeted, controlled, reproducible and application oriented blade tensioning guarantees straight cuts with no deviations even across numerous service cycles