11.Differences between drawing process and polishing process?
1). The wire drawing process is to carry out a new step of texture processing on the finished metal surface, change the original mechanical texture or surface defects, and make a regular and relatively uniform new texture. Common ones are pinstripe network and circle network. However, the polishing process is to polish the metal surface, making the surface of the workpiece completely flat, without any flaws, and looking like a mirror. The surface of the car has been polished, which makes the car reflect and glare in the sunlight. Polishing can make the workpiece as new. 2). The drawing process is repeated movement on the equipment, through which the surface texture of the workpiece is processed. Only by polishing and moving repeatedly in the mold can we achieve the desired results. The polishing process is to move the workpiece arbitrarily on a flat polishing machine to polish an absolutely smooth surface. Use 360-degree motion without dead angle to create a flawless plane. There are many differences between the two principles, and there are also huge differences in actual operation. 3). The drawing process requires different dies and professional process equipment. Polishing equipment required by polishing process is complex, different polishing equipment is required for polishing objects with different materials, and polishing angles are different, so polishing facilities need to be replaced to achieve the effect. Polishing reproduction is more complicated than drawing. Before the wire drawing process, it can be polished to create a good wire drawing environment for the workpiece surface. In this way, the effect of the workpiece produced by wire drawing will be better.
22.What are the factors affecting the polishing performance of stainless steel?
1)Surface defects of raw materials. Such as scratches, pitting, pickling, etc. 2) Material problems of raw materials. If the hardness is too low, it will not be polished easily, and orange peel will easily appear on the surface during deep drawing. 3) After deep drawing, small black spots will appear on the surface of the area with great deformation.
33.Will the antirust ability of steel pipe surface be reduced after polishing ?
1). If polished manually (mechanically), the antirust performance of steel pipe surface will decrease. Iron powder and impurities adsorbed on the surface are easy to react with air oxidation. Thereby causing rust. 2). If electrolytic polishing (electrochemical polishing) is used, the antirust performance of steel pipe surface will be improved. After electrolytic polishing, a negative chromium layer will be formed on the surface of the workpiece. It can prevent rust and corrosion.