Would you please help me to see why my two ring molds are broken?

The machine is Zhengchang 508, and the ring die that blew up a piece from the middle is made of alloy steel. It takes less than a month to check that there is no iron. The cracked one is stainless steel, it has been used 3 times, and no iron has been detected. The compression ratio is all 1:5. Attachments: you need to log in to download or view attachments. No account number? Registration-I feel the quality is not good! -what year was the 508 produced? Your photo angle is not good, and you still lack a picture from the inside out. It is not good to comment on DLG at 13:32 on 2009-9-7. Also, why is your carbon steel die blackened so much? -which manufacturer is the ring mold from? It is better to use the ring mold from a big manufacturer. For example: Zhengchang, Muyang, Shende-forgings may have cracks,-is it a widened ring die? -I have seen it once before. The first one is badly clogged and the ring die is not out of stock. The pressure is concentrated in the shedding place, if the material and heat treatment are not good, it will make the ring die gather strength in some weak place and cause the shedding locally! Shunxi added the following at 21:01 on 2009-9-7. The second one is for many reasons, so I won't list them one by one. I think there are two reasons: one is that there is something wrong with the forgings, the other is that the ring die is too thin-the equipment is Zhengchang. Is the mold Zhengchang, too? -whether a certain plane is not smooth enough, resulting in material blockage. And increase the pressure in the plugging area, so that the ring mold, burst crack? -I've learned that I don't know much about the production equipment! -is your model 508 or 508D, please? This has also happened in our 508D. The explanation given by Zhengchang Company is that we did not use the original mold (too expensive to afford it! )