Processing and heat treatment process of three-piece can sealing head

In the three-piece can production and beverage canning production process, the sealing quality directly affects the appearance of the can body and the shelf life of the contents, and the quality of the rolling head as a wearing part directly affects the quality of the sealing. .
The rolling head differs depending on the type of the sealing machine. The machining accuracy, in particular the shape and position tolerance, is very high. Poor processing accuracy will affect the quality of the seal, and it will also affect the service life of the parts such as the roller that is associated with it. Long-term work will affect the accuracy of the sealer itself.
In the long-term production practice and work of our company, we have come up with a set of suitable machining and heat treatment processes for the sealing head of the sealing machine:
(a) Material selection:
First, use 9Cr18 high-carbon high-chromium stainless bearing steel, so that it can not only ensure the hardenability and hardenability, but also guarantee the corrosion resistance in the beverage production and filling. The rolling head is as follows:



(b) Mechanical processing:
Except for the allowance of 0.2mm left in the dimension of the figure A, the rest of the finishing work, especially the connecting thread, must ensure the accuracy requirements and roughness requirements specified in the drawings in order to facilitate smooth installation.
(C) heat treatment process:
The heat treatment was carried out. The high-frequency heat was applied to the part A of Fig. A and heated to 880 degrees. Immediately, the oil was cooled, and then placed in a 150-degree furnace and kept in air for 60 minutes. The craft curve is as follows:
(d) To quench the outer part of part A to the specified size:
Due to the high-frequency local heating quenching process, the threads and other parts are heated and deformed to a small extent, ensuring the accuracy of the original size processing. At the same time, the screw thread of the rolling head is not quenched and the hardness is low, and biting will not occur with the screw thread of the sealing head of the sealing machine. This protects the accuracy of the sealing machine. In addition, the heating time of the working part is short, and the oxidative decarburization phenomenon is extremely slight, which ensures that the working hardness of the working part is more than HRc62, prolonging the service life of the rolling head.
After several years of practice, it has been proved that such a rolling head can completely replace the original imported rolling head, and the price is less than 20% of the imported rolling head, which is worthy of application and promotion in the actual production.

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