| 摘要 |
PURPOSE:To improve lubricity and corrosion resistance of cans by specifying a combination of a surface roughness of steel plates before working with a surface roughness of a punch to be used in working. CONSTITUTION:A forming is performed under the combination of a surface roughness of steel plates before the forming being <=0.4mum Ra with a surface roughness of a punch to be used in ironing being <=0.2mum Ra. A good coating percentage of tin, etc. applied to the surface of steel plates is maintained after the forming, so that a highest corrosion resistance and lubricity by coating is provided by the above method.
|
