Have you ever heard of the invisible champion? Why should "champions" be "invisible"?
The so-called invisible champion refers to the invisible world champion enterprise in the basic parts (components), basic materials, industrial software and industrial Internet basic fields of manufacturing industry.
"Invisibility" refers to the main product parts (components), materials or software of an enterprise, which are invisible inside the end products, which are not easily found and cause concern.
"Champion" means the invisible world champion (or the top three in the world).
The invisible champion is the world class "the super giant.".
The concept comes from Hermann Simon, a famous German economist and manager, who believes that the invisible champion should have three standards: (1) the top three companies in the world or the first company on a continent（ 2) Companies with turnover less than EUR 5billion（ 3) It's not a well-known company.
China Vice President China China Machinery Research Institute one belt, one road Entrepreneur Summit in Xuyi, Jiangsu recently, the national manufacturing power construction strategy advisory committee member, the former vice president of China Machinery Research Institute, and the director of the manufacturing Research Institute of the Chinese Academy of engineering, Qu Xian Ming, have pointed out that China has become the world's largest manufacturing country, but not a manufacturing power. "In 2018, It is a weak country of quality and brand. China lacks a group of world famous brands which represent excellent quality. This is the main bottleneck to be solved in made in China 2025, and it is an important task to cultivate the world invisible champion enterprises!
At the scene, he gave many examples of "invisible champions", such as Yinchuan small giant Machine Tool Co., Ltd., a sole proprietorship company of Mazak, the world's top two machine tool factory. This is a company that emphasizes the spirit of craftsmanship, and all key positions of workers will be sent to Japanese factories for 3 months and meticulous training; All CNC systems and functional parts are all high-quality products, and successfully create this super brand.
Haiyan Hengfeng is a private enterprise famous for the complex tools such as broach. Chen Errong, founder, has been struggling hard for more than 20 years, and has always adhered to the principle of quality first. Their motto is "to be a user, to be good at its work, to benefit its tools, to change and advance, to be satisfied for a long time and to create a famous brand". Hengfeng produced a super gear broach with a length of 3 meters and a diameter of 350 mm. It is the first in China and rare in the world, and is called "king of knives". It is already a real "champion".
When the stamping material in precision stamping is soft and magnetic adsorption material, the larger the size of the blanking step hole of the punch die is, it is easy to induce the lateral friction resistance, which eventually leads to the blanking hole blockage.
When stamping low melting point soft thin materials, such as copper, aluminum, etc., stamping will make the punching wastes which are separated at high speed and stacked together quickly, and melt into each other on the blanking surface. The punching wastes are no longer in the state of separation, but melt into a strip and discharge downward. When the cutting edge is designed with a hollow stepped hole, the strip waste separated from the constraint of the effective cutting edge wall will have a bending space in the enlarged stepped hole. The bending is caused by the different friction coefficient around the cutting edge wall, and the different friction coefficient is caused by the uneven gap between the punch and die assembly, and the inconsistent finish of the processing around the cutting edge wall of the die, When the bending head of the strip waste contacts the wall of the expanded step hole, the unilateral friction resistance will cause the strip waste to produce transverse distortion and deformation, further leading to the upsetting deformation of the strip waste in the step hole until the whole blanking hole is filled.
When the stamping object is magnetic adsorption material, when the die enlarges the size of the blanking step hole, the punching waste under high-speed stamping will be absorbed to the hole wall when rolling and falling in the enlarged step hole due to the influence of the magnetic adsorption force that the die does not demagnetize after grinding, and will gradually pile up to form a mutual shelving phenomenon of overlapping in the step hole, Increasing the transverse force of the punching waste, accumulating the friction between the punching waste and the wall of the stepped hole, finally affecting the normal fall of the punching waste, resulting in the blockage of the whole blanking hole.
There are two reasons for blanking hole blockage in stamping processing.
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