Take the portable fire extinguisher cylinder (as shown in Figure 1) as an example to explain the principles of reverse drawing used in the production of deep cylindrical parts with a height greater than twice the diameter (h > 2d). This includes the selection of the manufacturing process, determination of key parameters, mold structure formulas, and lubrication methods. The details are thoroughly discussed below.
1. Process Analysis
Based on product standards, process requirements, material welding performance, and cost considerations, the workpiece is best manufactured using a drawing process. The selected material is St12 steel plate, which follows the German standard DIN 1623 and is available domestically from companies like Baosteel and WISCO. This low-carbon cold-rolled steel offers excellent formability and welding characteristics, making it ideal for deep drawing applications. Key mechanical properties of the material are summarized in Table 1.
(1) Determination of Blank Size and Deep Drawing Process
According to the "Stamping Design Manual," the trimming margin for this part is set at 10 mm. This ensures sufficient material for the forming process while minimizing waste. The blank size is calculated based on the final dimensions of the cylinder and the expected deformation during drawing.
For more detailed information, please refer to the attached document or the article titled "Metal Processing (Hot Processing)" published in Issue 19, 2013. The article provides additional insights into the design and optimization of deep drawing processes, including recommendations for die geometry, lubricant application, and process control measures to ensure high-quality output and reduce tool wear.
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