What steel for the stamping mold doesn’t break the corner during mass production when the strip is 1.5T copper?
Stamping 1.5T copper strip, the product is copper plug, high speed stamping 250 times/minute, now use Cr12MoV mould steel, because there is a thin rib on the top of the product, so it is easy to crack /chipping, do you want to know what kind of mold steel to use can avoid chipping?
In fact, stamping this copper narrow strip with Cr12MoV should have problem of sticking copper
In order to resist the collapse of the narrow edge strip; and 250 times of high-speed punching, the mould steel to choose a very good abrasion resistance, to prevent the sticking issue, you have to choose no carbide segregation phenomenon for the steel,it prevents the occurrence of sticking material sticky wear and tear, the selection could divided into three directions.
1. For cost considerations, you can choose Cr8Mo2VSi, this kind of high toughness, wear-resistant cold working die steel. Such as DC53, Cr8Mo2VSi, 88, K340, the chipping resistance of these materials are much better than Cr12MoV, and the price are affordable, comparably cheaper.
2. If you are considering the anti-chipping and non-stick material, you can choose 8503 or 8566 , these two materials are without carbide segregation, they won’t stick material. Like 8503 performances 2 times better than DC53 in anti-chipping , the hardness is as good as HRC60-61, the wearing resistance is also enough. The 8566 is 4 times better than high-speed steel SKH-9, 2 times than D2 , it mainly solves the chipping issues that D2, DC53, SKH-9 can’t solve; particularly, such a narrow-edged and thick-strip punching, 8566 can be a good solution to the problem of chipping punches, and exponentially improve the work life of the mold
3. For the concern of wearing resistance, to choose high hardness materials, it is recommended that you use relatively good chipping performance of high-speed steel, such as SKH-51, its hardness can be achieved HRC62-64, because it is a tungsten-containing high-speed steel, but also with its high hardness, wear resistance is quite good.
Of course, because the products is narrow edged strip, in addition to considering wear resistance, we also have to consider the chipping resistance. If we are worried that the wear resistance of the mould is not enough, we can consider using HSS.
Of course! If you are using Cr12MoV mould steel, it’s a little too expensive so it wouldn’t be recommended unless it’s the compulsive request from the customer
So normally we can consider the price of the mold, life time, and the special structure of the parts, we need to put all conditions together, there is no “best material”,, but comparably the most suitable one!
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