Today I met a boss, he is stamping 1.3 mm 50 steel soft steel strip, 2.5 diameter punch pin, can only stamping 1-20,000 times, either the head collapse, or the R angle transition directly fractured.
There are also some bow-shaped flat punching knives, which are also head layered fractures. The molds are all prepared by the mold factory, with a hardness of HRC60-62, and the specific material is not clear. Want to know what kind of die steel is used to make it not easy to break? [Yuhui Mould Steel Huang Zipeng's Diary No. 786]
50 steel refers to the carbon content of about 0.5% of the carbon carbon steel, thickness of 1.3 mm, belongs to the thin plate soft material stamping conditions, in fact, the requirements for die steel is not high, most of the cold work die steel can be used.
At present, punching needles and flat punching knives are prone to cracking, and the hardness should be about HRC60, if you want to use die steel with good toughness, it is recommended to use 8566 die steel and 8566 reinforced type.
The toughness of 8566 die steel is 4 times that of high speed steel SKH-9 and 2 times that of D2.
In the range of hardness in the use of HRC58-60, the crack resistance of 8566 die steel is better than DC53, high-speed steel SKH-51, and even powder high-speed steel ASP23, and the toughness of punches and punches is very good.
At present, the smallest 8566 die steel has a diameter of 3.3, 4.3, 5.3 and so on.
If you want to rough work and then come back for heat treatment, you can also do it, we have arranged 8566 mold steel with the same material furnace to do it, using vacuum heat + ultra-cryogenic process treatment. Pictures of these are the 8566 punches that are returned to prepare for heat treatment.
If you want to make a flat punch knife, because the thinnest part of the boss's flat punch knife also has a thickness of 4 mm, which is not small, you can consider using 8566 to strengthen the type.
The anti-chipping performance of 8566 reinforced type is twice that of DC53, and the hardness can reach HRC60-62. The 8566 reinforced type has a high carbon content, so the hardness can be made higher.
At present, we do sheet hard material stamping, such as 301 stainless steel hard steel strip stamping, 65 manganese steel quenching steel strip stamping, to have high hardness and toughness, there are more bosses with 8566 reinforcement.
Because the 8566 reinforced type only has plates and no round steel, it is more suitable to be punches and flat punches.
There was also a boss who made a flat punch knife with a similar structure before, which was 1.4 mm 65 manganese steel, and DC53 and high-speed steel SKH-9 were used for punching knives.
I am Huang Zipeng, from Liaobu, Dongguan. Yuhui die steel, 3 of the world's top 500 are in use, Kyocera has purchased for 7 consecutive years.
If the boss in front of the screen also has a similar 1.3mm 50 steel soft steel strip punching needle and flat punching knife cracking conditions, you can also come to Yuhui die steel Huang Zipeng to try it.