Under the premise of similar alloy composition, the internal structure of Tool steel determines the performance of the steel. A netizen asked in the live broadcast two days ago, what kind of tool steel is good for stamping the stator and rotor of silicon steel and DC01 with a material thickness of 0.5-1.0mm? Now using SKH-9 high-speed steel, there are pull marks on the surface of the stator.
0.5mm-1.0mm thick silicon steel and DC01 iron material may appear soft, but silicon steel has orientation and is prone to sticking. Scratches on the product are usually caused by the adhesion and wear of the adhesive material. SKH-9 is a universal high-speed steel of the W6Mo5Cr4V2 series, with a hardness of 62-64HRC. It is a tungsten high vanadium material with high hardness and excellent wear resistance. However, segregation is an unavoidable defect in ordinary melted high-speed steel, and there are numerous microscopic cracks in the structure that are invisible to the naked eye. This is the root cause of mold sticking and scratches.
At this time, it is necessary to choose advanced process materials for powder metallurgy, because after powder metallurgy, high-speed steel can avoid the segregation problem that ordinary cast high-speed steel cannot avoid. Its steel has no directionality, and no matter how it is cut, it will not affect its use. At the same time, it also avoids microscopic cracks that are invisible to the naked eye, thus avoiding the defects of adhesive scratches and improving the anti cracking performance.
At the same time, the advanced technology of powder metallurgy can significantly increase the carbon and vanadium content of mold steel, and the wear resistance will also be improved accordingly. The grain size has also been refined and the strength has been improved. Fine grain strengthening is the most ideal strengthening method for metal materials. The carbon content determines quenching hardness, and the higher the carbon content, the higher the hardness.
The carbon content of PM23 is 1.3%, the vanadium V content is 3.0%, and the tungsten W content is 6.0%. The carbon and vanadium contents are higher than those of SKH-9, and the total type of carbides is more and more wear-resistant. It is also an advanced process of powder metallurgy, which makes the carbide morphology of PM23 very good, with a fine dispersed distribution, which is the most ideal organizational state. Its wear resistance and strength are simultaneously improved. This is the most ideal method of fine grain strengthening, which cannot be achieved by ordinary cast high-speed steel.
Stamping stator and rotor, SKH-9 mold, stator surface overlapping and with pull marks, you should think of using powder metallurgy for high-speed steel PM23.
A customer has given me feedback that Yuhui PM23 is really useful for making small punch heads with sharp corners. Originally, we used hard alloy YG15, which either broke corners or had a whole piece broken. We made 0.5mm silicon steel sheet material with a punching speed of 250 times. Yuhui PM23 punched 3 million times without any wear and tear problems, which is great!
The reason why Yuhui PM23 has such good performance is that it avoids fine cracks after advanced powder metallurgy technology, making the steel homogeneous. In addition, the alloy has a high total amount and hardness, and the microstructure is in an ideal state of fine grain strengthening. It not only improves wear resistance but also ensures high strength, making the mold have both high hardness and high impact toughness.
As the netizen mentioned, stamping 0.5-1.0 rotors and stators, now using SKH-9 high-speed steel, is prone to folding and scratching problems. I recommend using PM23 powder high-speed steel, which can ensure high toughness and prevent corner cracking problems; Not sticky and won’t scratch; At the same time, it has high hardness and high abrasion resistance, which meets the performance requirements of the mold. This ensures the service life of the mold and avoids folding and scratching problems, making it the most ideal material selection.
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I am Wu Dejian, the king of mold steel, from Yuhui Mold Steel in Dongguan. Yuhui Mold 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 steel selection and application, and help you pay less tuition fees. Wu Dejian’s mold steel, the chief of staff of the user, buys everything he has used!