We all know how important the ring die is when we use the biomass pellet machine to make pellets. The cracking of the ring die will greatly affect the production efficiency. Today, let's talk about the material factors in the cause of ring die cracking. The ring die of the biomass pellet machine is made of high-strength alloy steel or stainless steel. It must have excellent strength, toughness, wear resistance, and fatigue resistance. However, when many manufacturers produce, the quality of raw materials is unstable, and the production process is not well controlled, so the material properties fluctuate. The material is uneven, and the stress distribution is uneven when the ring die is subjected to force. The weak parts are prone to stress concentration. Once the local stress exceeds the yield strength, it will plastically deform. After a long time, micro cracks will appear.
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