Bandsaw Cutting Superalloys
When band sawing softer alloys, the more economical high speed steel blades can be utilized. The machine must be set up to cut at much slower speeds to use the high speed steels. Some equipment does not have the capability to slow feed or speed as much as needed. Blades that are 1.5-2" wide or wider are recommended to provide a rigid set up.
Tungsten carbide blades can be utilized and can cut much faster, the trade off will be the number of cuts per hour vs. the higher cost of the blade. Tungsten Carbide tipped blades are required when cutting material with hardness over Rc 37.
Blade manufacturers sucessfully used:
Grinding should be performed submerged or flooded with water soluble coolant. This reduces the heat into the material, reducing the effect of thermal expansion into the wheel. Soft materials may be gummy and may cause the need for the wheel to be dressed more often (if the wheel is not soft enough).
Many of our materials are austenitic, and some are only slightly ferro-magnetic. When utilizing magnetic hold downs, be aware that other holding methods may be needed to hold hold these grades. Austenitic grades also have a propensity to push into the wheel, as the coefficient of thermal expansion is normally much greater than that of magnetic materials.
Non-magnetic methods of fixturing:
- The use of a magnetic vice, if a low profile, can be employed.
- Tack welding magnetic tabs to pieces.
- Double disk grind
Some aerospace grades do not allow grinding, as it can alter the properties of the material - especially if the material is already age hardenable or age hardened.
Leave a comment if you want more information.