Casting mold vacuum heat treatment process technology

World Health:Casting mold heat treatment process technology occupies a vital influence in the field of tablet service platform.A, the surface solution technology of the mold...

Apr 28,2022 | Madison

Castingmoldvacuumheattreatmentprocesstechnology

Casting mold heat treatment process technology occupies a vital influence in the field of tablet service platform.

A, the surface solution technology of the mold

Mold in addition to the work on the provisions of the base material has a very high strength and ductility of the effective mutual cooperation, its surface properties of the mold in the work of the performance and use of the term is vacuum casting particularly important. Such surface properties refer to: anti-wear properties, anti-corrosion properties, friction resistance, fatigue properties, etc. This kind of performance improvement, purely rely on the base material raw material perfection and enhance is very insufficient, also is not economic development, and according to the surface solution technology, usually can receive half the actual effect with twice the effort, this also happens to be the reason why the surface solution technology obtains the rapid development trend.

The surface solution technology of mold is an engineering project to change the shape, composition, organization and internal stress situation of mold surface to obtain the required surface performance according to the surface coating, surface modified material or compound solution technology. In terms of the form of surface solution, it can be further divided into: organic chemical approach, physical approach physical approach and mechanical equipment approach. Although new solution techniques dedicated to enhance the surface properties of the mold are emerging, the more specific nitriding, nitriding and hard bottoming film buildup used in the manufacture of molds.

Nitriding processes include vapor nitriding, positive ion nitriding, liquid nitriding and other methods. In each nitriding method, there are several nitriding techniques that can meet the regulations of different products with different steel grades. Because nitriding technology can generate high-quality performance of the surface, and nitriding process and mold steel heat treatment process has excellent harmony, and at the same time the nitriding temperature is low after nitriding does not need violent cooling, mold deformation is very small, so the surface of the mold to strengthen is the choice of nitriding technology earlier, but also the most common use.

The purpose of die nitriding is mainly to better enhance the overall strong ductility of the die, that is, the working surface of the die has high strength and wear resistance. The technology thus introduced was conceived to reduce manufacturing costs by replacing high grade other raw materials with lower grade raw materials, i.e., based on carburizing and hardening.

At the present stage, CVD and PVD are the most advanced hardened film deposition technologies, and nowadays, there are various types of enhanced CVD and PVI technologies to improve the compressive strength of the surface of the film products. Hardened film stacking technology was first used on special tools (CNC inserts, tools, measuring instruments, etc.), and the actual effect is excellent, and a variety of CNC inserts have been coated with hardened film as a standard processing process. Moulds since the 20th century 80 era began to choose the coating of hard primer technology. At this stage of technical standards, hard bottoming film stacking technology (mainly machinery and equipment) the cost is high, still only in some high precision, long life mold use, if you choose to create the core of the heat treatment process method, the cost of coating hard bottoming film will be significantly reduced, a large number of molds if you choose this technology, can overall enhance the level of mold production and manufacturing in China.

Second, the mold vacuum heat treatment process technology

Vacuum heat treatment process technology is a new type of heat treatment process technology that has been developed rapidly in recent years, it has the characteristics, it is precisely the urgent need to solve the mold manufacturing, such as avoiding air oxidation and not carburization, vacuum decompression distillation or degassing, remove hydrogen embrittlement, and thus enhance the plasticity of raw materials (parts), ductility and fatigue limit. Vacuum heating is slow, the temperature difference between the inside and outside of the part is small, and other elements, the decision of the vacuum heat treatment method leads to small deformation of the part, etc..

According to the choice of cooling medium is different, vacuum heat treatment can be divided into vacuum oil cooling heat treatment, vacuum air cooling heat treatment, vacuum water cooling heat treatment and vacuum nitrate isothermal process heat treatment. The specific use of vacuum heat treatment process in mold is vacuum oil cooling heat treatment, vacuum air cooling heat treatment and vacuum quenching. In order to maintain the excellent characteristics of the product workpiece (such as mold) vacuum heating, the selection and development of coolant and refrigeration processing process is very critical, the key to the whole process of mold heat treatment is the selection of oil cooling and air cooling.

For the heat treatment process will not be carried out again after the processing of the mold table, after heat treatment, try to choose vacuum quenching, especially the vacuum heat treatment of the product workpiece (mold), it can improve the performance of mechanical equipment related to the surface quality. Such as fatigue performance, surface gloss, corrosion, etc.

Heat treatment process of the electronic computer simulation simulation technology (including institutional simulation simulation and performance prediction analysis technology) of the successful development and use, prompting the mold of intelligent system heat treatment process into a very possible. Because the mold production and manufacturing of small batch (or even bulk), multi-category characteristics, and its heat treatment process performance provisions of high and do not allow the occurrence of scrap characteristics, and prompted the mold intelligent system solution into a must. The intelligent system heat treatment process of mold contains: establish the structure of mold, material, heat treatment process performance regulations: mold heating whole process temperature field, ground stress all over the electronic computer simulation; mold cooling whole process temperature field, change the whole process and ground stress all over the electronic computer simulation; heating and cooling process whole process simulation; heat treatment process development; heat treatment electric furnace of Mechanical automation technology. Overseas industrial production capitalist countries, the

Such as the United States, Japan, etc., in the vacuum Koran gas quenching level, has long been carried out in this area of technology product development, the key for the overall goal is also mold.

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