Manufacturing Process Research Of Die

We mainly study the die which is the key part and main wearing part of pelletizer of pellet feed processing and manufacturing technical in this issue. In order to make a evolution of die, we adopt the research method which combines optimize method of experimentation design and Analytical Method of Finite Element ( FEM). Orthogonal experiment is also used in the trials design. We take the basic model die which is made by Jiangsu Muyang group to analyze the character of material ,heat treatment and cold processing technology.etc which affect the performance of die. For cold processing technology of die hole,we mainly study the working procedures of die hole drilling,and for Die hole roughness, hole Chamfering and counter bore processing. For heat treatment, we mainly study the affection from quenching temperature of vacumn heat treatmenter for die,The affection of backfire temperature for die hardness,the affection of vacumn quenching for Die hole roughness. and the affection of vacumn quenching and backfire for Die dimension. In the Analytical Method of Finite Element ( FEM),UG and ANSYS are adopted as Simulation circumstance, for the Die working life, we studied the aspects compression raito and mixed feed ,then obtain a series of parameteried average stress as the the evaluated indicator for die working life.The main research of ring-die heat treatment process is about vacuum furnace quench, impact to die hardness and strike tenacity through backfire temperature, impact to die hole coarseness by vacuum quench, impact to cooling and hardness of die by backfill air and heat treatment effect on die's dimension.The hardness will increase by 1～1.5 HRC when the quench temperature boost from 1030℃to 1050℃; while quench with a temperature of 1060℃, the hardness is high but strike tenacity is decreased distinctly. So the appropriate quench is 1040℃. To proof high hardness after backfire meanwhile to avoid the scope of temperature to make brittleness in quench, it is better to quench with a low temperature 200℃then the final performance hardness is between 52～55 HRC which can guarantee that die will not break and less wearing between hole and working face then the die's usage will be prolonged a lot. Vacuum quench will not affect hole's coarseness. In same loading, adding backfill air pressure will boost die's cooling and hardness. Compared with adding 1.3bar air, cooling time reduce by 23%, hardness increase 2～3HRC with 1.6 bar air. The bigger of backfill air, the faster of cooling and bigger distortion of die. Considering all the inspects, it is better to use 1.6 bar backfill air. Die will be decreased after heat treatment, but it can also be rising if backfill air is not big and slow cooling.In finite component analyses, UG, ANSYS is made as the imitate condition. To die's usage life, through analyses the different stress and stress hardness in even and uneven load it can supply reasonable project to resolve uneven wear.According to this subject We finally proposal the heat treatment processing technology standard of vacumn quenching and Die hole clod processing and engender the checking and accepting standard for die product. Above information will be a very good reference and application value for Die manufacturer and designers,and This is also experiment a significative trial for die study.