Zhejiang stainless steel stamping processing, what are the analysis of stamping die drawing parts + 15 years of experience manufacturers

The technical staff in charge of the Zhejiang stainless steel stamping processing factory said about the product quality analysis of the stamping die drawing parts. The following Xiaoshuo will share with you based on many years of practical experience: During the product drawing process, the drawing parts will mainly appear these few Various problems: wrinkles, cracks, uneven thickness, surface scratches, shape distortion, springback, etc. Among these phenomena, wrinkling and cracking have the greatest impact on product quality. Products with these two problems must not be delivered and must be adjusted. Products with these two problems generally can only be scrapped, and customers will not need. 1. The problem of wrinkling During the stretching process, the surrounding edge part of the material loses stability due to excessive tangential stress, causing the product to form uneven wrinkles along the edge tangential direction, which is called wrinkling. When the wrinkling is severe, it will also make it difficult for the material to pass through the gap between the concave mold and the convex mold during the stretching process, increase the tensile deformation force, and even cause cracking. The occurrence of instability depends not only on the size of the tangential stress at the edge of the material, but also on the thickness of the stretched part. Generally speaking, it is better to use nitrogen gas spring or Uniglue for drawing molds, and it is less prone to wrinkles and cracks. why? Because the force of the nitrogen gas spring or Uniglue is generally more balanced, there will be no problem of uneven force. Nitrogen gas springs are better than Uniglu, because they are powerful and very balanced, but the price is many times more expensive than Uniglu. Many factories can’t afford it. Generally, only slightly larger factories have them. The money uses nitrogen gas springs. Youligu will shrink when it is used for a long time, and its strength will not be as great as before. You must replace it with a new one, but its price is much cheaper than that of a nitrogen gas spring. Blanking rings can be used to prevent wrinkling. In some places they are called blanking ribs. They all mean the same thing, that is, putting a circle of raised ribs around the material without affecting the subsequent processes of the product, commonly known as blanking ribs. , Press the material around, the advantage of this is that the stretched product will be fuller and can also prevent wrinkles. The blank holder force needs to be relatively adjusted during mold trial. Generally, the design is not so reasonable, and the height of the blank holder needs to be adjusted appropriately according to the output product. If the blank holder force is too large, the friction between the material, the die and the blank holder ring will increase, and the wall of the material will become thinner, or even crack; if the blank holder force is too small, it will not be able to effectively prevent wrinkles. . The second problem is tearing, which is often encountered in the stretching process. When the tensile stress on the wall of the cylinder exceeds the strength limit of the material, the product will crack, and the crack generally appears at the wall of the cylinder slightly above the round corner of the punch. The factors that affect the product's cracking are: the tensile properties of the material, the diameter and thickness of the material, the drawing coefficient, the fillet radius of the concave and convex mold, the blank holder force, the friction coefficient, etc. The radius of the rounded corners of the concave and convex molds is too small and too sharp, and it is easy to crack the product. The general method of repairing the mold is to find a way to enlarge the rounded corners, make the rounded corners a little smoother, and polish the corners. It is also possible to add oil during production, especially the special oil for stretching, which is very effective. When designing a stamping die, you can try to enlarge the rounded corners if the customer’s product requirements allow it. Don’t make it too sharp. Some designs are not well understood. The designed drawing die cracks very much during the trial. Awesome. When stretching, necessary lubrication is used, which is conducive to the smooth progress of the stretching process, and the thinning of the cylinder wall is improved. However, it must be noted that the lubricant can only be applied to the working surface of the concave mold, and the surface of the convex mold and the material must not be lubricated, because there is a favorable friction between the convex mold and the surface of the blank, which can prevent the material from sliding and pulling. Cracking and thinning. Hardware, 15 years of focus on Zhejiang stainless steel stamping processing, 5000 square meters production workshop, hundreds of precision processing and production equipment, more than 20 Ru0026D and design engineers, monthly processing capacity of 100+ sets of molds and daily production capacity of 3 million punching times, stamping accuracy can reach 0.01mm, 16 quality inspection layers are strictly controlled. It can quickly solve the urgent problem of time when choosing hardware stamping processing, solve the problem of stamping accuracy, and solve the problem of production quality. 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