A world leading manufacturer of pellet dies
GUN DRILLING
ANDRITZ pioneered this technique in the early 1980s.
ANDRITZ profits from decades of practical experience and has invested heavily in perfecting the process of manufacturing highly specialized products. As well as producing key components for our own range of pellet mills, ANDRITZ also produces pellet dies for other pellet mill makes and models, thus setting the standard in the industry for products.
MANUFACTURING PROCESS
Every tiny part of the die has, at some stage, been pro- duced with a single machining operation. A mid-sized die with 4 mm holes will have as many as 10,000 holes. Add to that a countersink and a counter-bore, and the result will be 30,000 machining operations, each one conforming to the accuracy of the pattern. After drilling and tapping bolt holes, milling keyways, turning up the basic shape of the die blank, cleaning, drying, vacuum hardening, tempering and finally finishing to the fitting sizes, the entire produc- tion of the die has gone through nearly 40,000 separate machining, processing, and handling operations.
MATERIALS
ANDRITZ offers a variety of chrome steel alloys. By varying the content of vanadium, chromium, manga-nese nickel, and carbon, we can select a material that suits every individual requirement for a wide range of operating environments.
PRECISION MACHINING
With our technical support, customers take great care in specifying size, shape, and pattern of the required die holes. We meticulously follow these instructions and manufacture the dies with accuracy and repeatability on the basis of an automated production process.
HEAT TREATMENT
Our experienced operators establish heat treatment programs for dies going into vacuum hardening ovens.
The heat treatment process is of utmost importance as it guarantees the product uniformity.
ANDRITZ has invested substantially in the most modern hardening technology to produce a long-life and high- performance die
Cornerstones of our quality-assured product range
RAW MATERIALS
Selected high-quality steels with fine grain structures give high strength and durability.
AUTOMATED COUNTERSINK
Carefully following the drill pattern, the countersink is machined into the die track. Countersink sizes are selected to increase the pelleting performance.
GUN DRILLING
A fast and accurate process for producing highly polished extrusion holes. ANDRITZ pioneered this tech- nique in the early 1980s and now produces the finest pelleting dies in the world by optimizing drilling speed and controlling lubricants.
WASHING AND POLISHING
Oil, moisture, and machining burrs are removed from the die surface prior to the heat treatment.
MACHINING
CNC machining centers programmed with die dimen- sions for all pellet mill makes and models machine the basic shape of the die with precision accuracy.
VACUUM HARDENING
A hard-wearing surface in the holes will maximize the life of the die. Air is removed to create an inert envi- ronment. The die is heated in stages controlled by a microprocessor up to a temperature of 1,010 °C, and the steel becomes a hard molecular structure as a result of this process.
FINISHING AND FINAL INSPECTION
Quality-assured systems monitor the product throughout the entire manufacturing process. In the final stage, and as the die is machined to fit the pellet mill perfectly, a check is conducted to ensure that the product conforms to the original specifications. The dies are then packed and prepared for dispatch to all parts of the world.
Original spare parts and service support
ROLL SHELLS
ANDRITZ roll shells, available in several patterns, are designed to match the excellent performance of its dies. Roll shells operate under extremely harsh con- ditions. Therefore, it is vital that the dimensions are accurate and the hardening process is of the high- est standard. ANDRITZ will assess your needs and help select the correct design for the application.
BEATERS
Profiled and hardened on our premises, the beaters have established an excellent, worth-the-money rep- utation. Now in the third generation of steels, beat-ers combine good wear resistance properties with strength and durability. ANDRITZ manufactures beaters of any size or shape to fit all hammer mill models.
