Production process flow and control original data → Original data inspection → Original data pre-treatment → Ingredients → Ingredients inspection → Vacuum induction smelting → Quick-cool ingots → Semi-finished product inspection → Heat treatment → Coarse crushing → Powder making → Screening → Post-treatment → Vacuum or Nitrogen-filled packaging → Finished product inspection → Product
A: Exercise:
1) Process requirements information suppliers supply material sheets, and the QC department must also conduct tests, and the processing of the ingredient and impurity content satisfies the process requirements is put into the warehouse for backup.
2) The important thing in material pretreatment is to eradicate the pollutants and oxide layers on the surface of the original data to ensure the cleanliness of the original data.
3) The ingredients should be supplemented with the burning of certain volatile elements such as rare earths and manganese according to different situations and according to the prescribed goals.
4) Vacuum induction melting must be filled with argon at a vacuum of 0.1Pa, and the metals of each component are melted into an alloy at a high temperature of 1300℃, and the ingots are quickly cooled to obtain an alloy with fine grains and uniform structure.
B: Semi-finished product: There are three aspects to check semi-finished product:
1) Appearance: The appearance of the alloy should have a metallic luster without obvious oxidation and discoloration, and the alloy structure should be uniform and fine, without looseness or impurities;
2) Chemical composition: The chemical composition of the alloy should be consistent with the planned composition;
3) Electrochemical capacity: It should meet the company's specifications, otherwise it cannot be transferred.
C: Heat treatment:
A vacuum heat treatment furnace is used, and then argon is charged for maintenance after vacuuming. The heat treatment process is important to homogenize and stabilize the product (eliminate internal stress), ensure the flat platform pressure of the alloy, outstanding uniformity and outstanding cycle life characteristics. Focus on ensuring temperature and vacuum, and performing oxygen content measurement.
D: The entire process of alloy coarse crushing, powder making and packaging is carried out under argon maintenance to ensure that the alloy has very low oxygen content. There are four aspects to inspect finished products
1) Appearance: No discoloration and oxidation on the outside, no agglomeration on the outside
2) The physical properties, particle size distribution, and loose-fitting ratio are in line with company specifications;
3) Chemical characteristics: the composition and impurity content of the alloy powder and the PCT curve of the alloy meet the company's specifications;
4) Electrochemical properties: the electrochemical capacity, charge and discharge characteristics, cycle life, high current pulse discharge characteristics and temperature characteristics of the alloy. The inner packaging of the product is a vacuum double-layer packaging of nylon composite plastic bags, and the whole box is filled with nitrogen-filled plastic bags. The outer box is: carton.
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