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Mold materials technology research and development facing the revolution

Number of visits: Date:Nov 22,2016

  [network] HC hardware with the development of industry of our country mould, quantity, quality, variety and performance of die materials proposed higher and update requirements, mold materials market has also been rapid development. According to the international mould and hardware plastic industry suppliers association deputy secretary general Luo Baihui, mold material scope is very wide, from general carbon structural steel, alloy structural steel, carbon tool steel, alloy tool steel, high-speed tool steel, stainless steel, maraging steel and hard alloy, difficult to molten alloy, high temperature alloy, non iron metals can be used, which is mainly belongs to the alloy tool steel mold steel. At present, the output of the alloy tool steel in China has been in the front row of the world, among which the alloy die steel is about 100 thousand tons. China Die & mold industry each year, the total amount of die materials is 300 thousand -40 million tons, of which the alloy die steel is 130 thousand -15 million tons.

  International Mould and hardware Plastic Industry Suppliers Association Professional Committee of steel expert consultants Guang Chao Li said that at present domestic die steel with high quality is relatively small, demanding a considerable part of the die steels need after vacuum refining and electroslag remelting, to ensure the material of high purity, high relative density, higher to, and by electro slag remelting of die steel for the share is very small. Die steel market is about 80% is black round bar, users get the material will change their forging restructuring, the utilization rate of materials is low, production cycle length, can not adapt to the needs of the modern mold manufacturing industry.

  Alternative technology of traditional steel

  Shenzhen City Granville Special Steel Co., Ltd. research and development of new, efficient ts4 mold copper alloy material casting, degree of hardness can reach HRC38-45, without heat treatment, easy manufacture and processing, low friction coefficient and in the alloy join wear element, make originally wear-resistant copper alloy wear resistance even further improve, particularly suitable for the need of drawing die. In the mold manufacturing costs, material costs often account for only about 20% of the cost of the mold, but the efficiency in the use of mould of mould industry competition is competition, rather than to mold material low price to win, so for the demanding long-life die, in the selection of mold materials often need to strive for excellence. For example, the carbide uneven degree of Cr12MoV Grade 5-6 steel manufacturing drawing die, the service life is often less than 10 thousand; while the use of TS4 copper alloy die casting tensile modulus, the service life of up to 70 thousand or more. This is because the thermal conductivity of ts4 copper alloy mold material, and can guarantee the uniform temperature distribution in the die, not by local high temperature so as to make the mould crack, nor the tensile surface of products appear cold welding marks and wrinkle removal, which can shorten the opening time, improve the service life of the mould, and improve the production efficiency and product quality. Now ts4 copper alloy mold material has been successfully should be used for stainless steel sheet metal drawing die, aluminum alloy die-casting mold, plastic injection mold, copper alloy gravity casting and low pressure die casting mold, glass bottle manufacturing mode, will replace the traditional mold steel and cast iron, called die materials in the field of a revolution.

  Metal materials, laser surface strengthening technology can be used for surface strengthening of metallic materials, solve the overall reinforcement and other surface strengthening method is difficult to overcome the contradictions; can also be used for surface modification of metallic materials, the low grade materials of high performance surface. The technology of laser surface hardening is a new way to reduce the cost of die manufacture.

  1, cold work as a mold material replacement technology

  Cold work die requires material with strength, toughness, wear resistance, fatigue resistance and resistance to bite. Cold work die used in high carbon steel, low alloy steel or cast iron by laser transformation hardening instead of the traditional process of high grade material, widely used in space technology. Although the cold working die is widely used in the high alloy steel has unique wear resistance effects of carbides, but laser phase transformation strengthening due to dispersion strengthening, strengthening the distortion, machining process and heat treatment process without oxidation decarbonization and etc. strong working layer, can make up for the high alloy steel with carbide wear-resistant effect. So the technology of laser hardening is flexible and can be widely used in the field of material substitution technology. The working temperature of the plastic mold has the same material substitution technology space as the cold working die under 350 centigrade.

  2, hot work as a mold material replacement technology

  In addition to the requirements of hot mold materials with strength, toughness, wear resistance, resistance to fatigue and resistance to the performance of resistance, the red hardness and resistance to tempering properties have special requirements. High temperature resistance and low material cannot replace the laser transformation strengthening of high alloy steel. The mould manufacturing technology and laser cladding can be made of carbon steel, low alloy steel or cast iron with high temperature performance. The working temperature of the plastic mold can be used as the same material substitution technology for hot work at more than 400.

  3, cast iron mold

  The strengthening potential of the cast iron mold depends on whether the matrix structure is pearlite or not. If the matrix organization has too many ferrite, will reduce the hardness of the material, so the material instead of the cast iron mold to enhance the potential for strengthening the target. Based on the national standard, the graphite cast iron need to select more than QT600, compacted graphite cast iron need to choose RT380 above, gray cast iron need to choose HT200 above grade. At present, there are a large number of HT150 molds in the market, and the effect of phase transformation hardening is not good.

  4, gear and die remanufacturing technology

  In gear or die damage or defect parts using laser cladding process cladding specific alloy material, make it with the matrix metal materials form a good metallurgical combination, this kind of repair processing not only to teeth

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