Mr. Gu asked: What kind of steel is used for punching needles that are both sharp and will not crack?

Mr. Gu asked: What kind of steel is used for punching needles that are both sharp and will not crack? Punch a 4.5mm hole on a 1mm thick pure nylon plastic product. The SKD61 punch needle purchased on Taobao is prone to breakage and may not be sharp when punched. The key is that the items purchased on Taobao are not known to be genuine or fake.

The most important thing when buying something is to feel at ease. Even if you can’t believe what you’re buying, how can you use it with peace of mind? Even if something goes wrong, you don’t know how to improve it. This is the most painful thing. Buying things is easy, trust is not easy, this is the current pain point.

Thin walled hollow punching needles with SKD61 are prone to breakage, which requires consideration of both toughness and strength. Punch 4.5mm holes on top of 1mm thick pure nylon. Nylon is not hard, so the punching needle does not need to be too hard. Instead, toughness should be prioritized.

SKD61 is a hot work tool steel made of 4Cr5MoSiV1, with a hardness of 50HRC and good toughness, but poor wear resistance. It is normal for it to wear easily now, but it is not wear-resistant enough and prone to breakage, indicating insufficient strength. Therefore, it is necessary to choose a die steel with a hardness of 56-60HRC and toughness. Considering all factors, I recommend 8566 anti collapse steel.

8566 tool steel is a proprietary anti collapse steel developed by Yuhui tool Steel, which mainly solves the problem of mold cracking; The anti cracking performance of 8566 is four times that of high-speed steel SKH-9 and twice that of D2, with a hardness of HRC58-60. It can solve the cracking problem that cannot be solved by high hardness mold steels such as D2, DC53, and SKH-9; Especially in harsh working conditions such as stainless steel stamping, sharp corner stamping, narrow edge stamping, stamping aperture smaller than plate thickness, and stamping ratio less than 1:1, the cracking that cannot be solved by conventional mold steel is solved by using 8566 anti collapse steel.

We have a customer who uses 8566 as a hollow punch to drill holes in car seats. Originally, SKH-9, DC53, and tungsten steel punches all had to break, but thin-walled hollow punches made with 8566 did not break.

This case is similar to Mr. Gu’s consultation and has reference value. Therefore, Mr. Gu punched a 4.5 hole in 1mm thick pure nylon. The SKD61 punching needle is prone to breakage and is not sharp when punched. We strongly recommend 8566 anti collapse steel.

The use of 8566 tool steel for punch cracking is a double-edged sword in both old and new societies.