The purpose of using lubricants in the drawing process and how to use lubricants correctly?

What is the purpose of lubrication in the drawing process? The purpose of lubricating the drawing blank is as follows: 1) Reduce the friction between the material and the die, thereby reducing the drawing force. Experience has shown that there is lubricant and no lubrication. Compared with the agent, the drawing force can be reduced by about 30%. 2) With lubricant, large deformation can be achieved during deep drawing, which reduces the number of deep drawing passes. The drawn part is also easy to remove from the mold. 3) The lubricant protects the mold surface and cools the mold, thereby improving the life of the mold; the lubricant has a protective effect on the surface quality of the workpiece, thereby protecting the quality of the metal stamping parts. What are the requirements for the lubricant used in deep drawing parts? How to use the lubricant correctly? The requirements for the lubricant used in deep drawing are: 1) It can form a certain thickness of a high-strength oil film to withstand higher pressure. 2) Good adhesion. 3) Easy to remove from the surface of the workpiece. 4) It is more convenient to mix, use, store and transport. 5) No corrosion on the surface of the mold and workpiece. 6) Non-toxic, stable chemical properties. Pay attention to the lubrication of a single blank before drawing: 1) It is not necessary to coat the entire surface of the blank with lubricant. 2) Lubricant is only applied to the place in contact with the die, and applied once every few days. 3) It is not allowed to apply lubricant on the surface of the punch and the blank that is in contact with the punch, because this will cause the blank to slide along the surface of the punch, causing extension and thinning. 4) When the thin material is first drawn, it is not necessary to apply lubricant to the blank, because the lubricant reduces the friction between the flange and the mold, and promotes the formation of wrinkles. At this time, it can only be applied to the circle of the cavity of the cavity. Corner. 5) In the last deep drawing, you only need to apply lubricant to the outer surface of the drawn part or the cavity of the cavity. 6) The blanks or materials that have been coated with lubricant should be careful not to stain them, otherwise it will damage the drawing parts and stamping dies. Previous post: What are the preparatory work to be done after receiving an order for metal stamping parts?