BASIC RULES FOR THE CORRECT USE OF DIES

1) Make sure that the rollers are correctly adjusted: the roller to die distance must be 0.2-0.3 mm. A bad roller setting can cause contact between rollers and die. This may cause “rollover” on the die holes - deformation and partial blockage of the holes.

2) A new die requires a running-in period. Start new dies progressively, at least for the first 20-40 minutes, so they warm up slowly. If problems are encountered during start up, operate the die for 20-40 minutes with a mix of bran, oil (2%) and abrasive powder (2%). When production is finished, only stop the die after running it on oats or maize.

3) When changing dies, carefully inspect the condition of the die seating surfaces and the fixing systems (i.e. collar, clamp or wear ring). N.B.: if the die is not properly fixed it can break.

4) If die “rollover” is found on the hole face, check that the wear ring (or clamping ring) of the die holder assembly has not gained excessive play. If this is the case, the rollers might may come into contact with the working surface of the die and damage it, laminating its surface and deforming the hole entrances (see rollover).

5) The die clamping rings should be checked every time a new die is mounted on the machine, especially for dies with large flanges. Experience shows that the majority of broken dies are caused by worn out or defective clamping rings. Dies running with a defective clamping ring can create strong vibrations, broken dies and a reduced die lifespan.

Inspecting the die:

  1. make sure that the material is evenly distributed across the whole working area
  2. make sure that all holes work to uniformly (opening clogged/closed holes if necessary)
  3. make sure that the hole inlets are not damaged by contact with the rollers or as a result of tramp metal. Restore the countersink of the holes if necessary.