A netizen asked in the 270th live broadcast room: What mold material should be used for stamping and bending 0.5mm thick stainless steel with fewer marks at the bending position?
Scratches at the bending position are caused by adhesive wear of the adhesive material. When choosing mold steel, you need to choose tool steel that has no segregation, no micro cracks, and good smelting quality. As long as the tool steel avoids micro cracks, there will be no adhesive wear of the adhesive material during punching and cutting friction. Based on past user experience, there have been successful cases of bending molds, so we recommend two types of mold steel.
The first one is 8566 anti collapse steel, because the anti collapse performance of 8566 die steel is four times that of high-speed steel SKH-9 and twice that of D2, with a hardness of 58-60HRC. It mainly solves the cracking problem that cannot be solved by high hardness mold steels such as D2, DC53, SKH-9, etc; Especially in stainless steel stamping, sharp corner stamping, narrow edge stamping, thick plate stamping, precision stamping molds and other conventional tool steels that cannot solve cracking, 8566 mold steel is used to solve it.
The reason why 8566 has such good anti cracking performance is not only because of its good alloy ratio, but also because of its good smelting quality. It is smelted using a critical gas electric slag furnace, with 4500 ton equipment for six sided forging, three forging and three pulling, avoiding microscopic cracks that are invisible to the naked eye, and thus avoiding adhesive wear caused by sticking materials. At the same time, its thermal conductivity is high, and the heat generated during stamping and scraping will be quickly dissipated. The parts and punch will not heat up, so there will be no adhesive wear of the adhesive material.
Mr. Chen is stamping and bending 1.5mm 430 stainless steel. When using DC53 punch for stamping 20 products, there will be a problem of sticking material on the punch. Once the punch sticks, the product will have scratches. After Mr. Chen found me, I recommended him to use 8566 anti collapse steel.
A few days later, Mr. Chen deliberately called to say that 8566 mold steel stamping 1.5mm 430 stainless steel is really useful. Previously, if 20 products were punched, they would stick to the mold. Now, using 8566 mold steel, 5000 products have been punched without any sticking problems with the punch, and the products punched out are also very beautiful. I didn’t expect 8566 to be so user-friendly, it’s really amazing.
The second recommendation is PM23 powder high-speed steel. The high-speed steel produced by advanced powder smelting technology has no structural segregation, eliminating microscopic cracks that are invisible to the naked eye, and there will be no sticking phenomenon during punching and cutting. In addition, the total amount of alloy produced by powder metallurgy is high, with a hardness of 64-66HRC and excellent wear resistance.
Mr. Liang is stamping and bending 0.9mm 304 stainless steel, and the inserts at the bending position are always worn out. At first, Cr12MoV was used, and later DC53 was used, both of which were prone to wear and tear, resulting in scratches on the bent products. After finding me later, I recommended him to use PM23 powder high-speed steel because the boss deliberately emphasized that as long as it is easy to use, the price is not a problem.
After a month, I followed up with Mr. Liang and the boss said: The PM23 you recommended is very useful, and the current inserts will not wear out. The mold has already stamped 50000 products. During the grinding process, I deliberately looked at the bent inserts, and there was no wear at all. It is very useful. Thank you for your good recommendation.
The netizen stamped 0.5mm stainless steel, and wanted to minimize scratches at the bending position. I would recommend using 8566 anti collapse steel as a priority. There are already successful cases, so you can use it with confidence. Its toughness is better than PM23, and the price is lower than PM23. The quality price advantage is obvious. If you have a large quantity of products, are willing to spend money, have small punch sizes, and do not use a lot of mold steel, then you can use PM23 powder high-speed steel. PM23 is not a problem except for its higher price.
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I am Wu Dejian, the king of mold steel, from Yuhui Tool Steel in Dongguan. Yuhui Tool Steel is used by three Fortune 500 companies and has been purchased by Kyocera for seven consecutive years. I have solved over 4000 problems in mold selection, production, and use for more than 4000 companies. If you are unsure about which material to use when choosing mold steel, or if you are currently using mold steel with a short lifespan, please feel free to contact me. I believe I can be your chief of staff in mold selection and application, and help you pay less tuition fees. Wu Dejian’s tool steel, the chief of staff of the user, buys everything he has used!