As a new cutting tool, TiAlN coated cutting tool shows incomparable excellent performance in milling material with high hardness and high strength at high speed. The study shows that TiAlN has its unique cutting characteristics and rule in milling materials with high hardness and high strength in high speed under different milling conditions. This study shall provide reference for TiAlN coated cutting tool to mill materials with high hardness and high strength through the study on the wear rule of TiAlN coated cutting tool.
In high-strength steel hot forming, under the heating and quenching interaction, the material is oxidized and de-carbonized in the surface layer, forming a gradual change microstructure composed of ferrite, ferrite and martensite mixture and full martensite layers from surface to interior. The experiment enunciation: Form the table to ferrite, ferrite and martensite hybrid organization, completely martensite gradual change microstructure,and make the strength and rigidity of material one by one in order lower from inside to surface, ductility one by one in order increment in 22MnB5 for hot forming;Changes depends on the hot forming process temperature and the control of reheating furnace gas content protection, when oxygen levels of 5% protective gas, can better prevent oxidation and decarburization;Boron segregation in the grain boundary, solid solution strengthening, is a major cause of strength increase in ;The gradual change microstructure in outer big elongation properties, make the structure of the peak force is relatively flat, to reduce the peak impact force of structure, keep the structure of high energy absorption capacity;With lower temperature, the material yield strength rise rapidly,when the temperature is 650 °C, the yield strength at 950 °C was more than 3 times as much.
Starting with 22MnB5 boron and magnesium alloy sheet material forming temperature, cooling rate and phase deformation, the impact of cooling rate and temperature change on rebound during hot-stamping as well as the impact of factors such as sheet material thickness on high strength sheet material forming performance. The study shows that the initial conditions, temperature changes during thermal forming and phase deformation are the main factors affecting rebound. When the cooling rate is above the critical cooling rate, rebound increases dramatically. The sheet material thickness has important impact on rebound control and formulating parameters for thermal forming process.
High-strength sheet including 2MnB5 Boron and magnesium alloy sheet is the material commonly used in modern machinery, which is easy to induce problems such as excessive rebound, cracking, forming force increase, easy mould wear and the like. The heat analysis of 2MnB5 Boron and magnesium alloy sheet hot stamping forming process and experiments indicate that the transition process from Austenite to Martensite by controlling the sheet heating and cooling temperature is the foundation of heat forming. Only when the cooling rate reaches or surpasses the critical cooling rate, Austenite can be transformed to Martensite directly. Critical cooling rate of sheet is related to the elements of critical water flow rate, mould cooling system design, cooling medium, dented mould medium and the like. Under the condition that the elements of mould structure, cooling system, cooling medium and the like are defined, critical cooling rate is a constant value. As a result, through controlling critical water flow rate, hot forming transition process and hot forming requirements can be guaranteed to overcome the excessive rebound, cracking, forming force increase, easy mould wear and the like in hot forming process.
Microscopic observation and testing were carried out on the structure & texture, bonding form and performances of different plasma-sprayed ceramic coatings on the wear surface of Cr12MoV dies by KYKY-2800B SEM. The result indicates that the bonding between the coating and the die matrix surface is mainly of mechanical form, the bonding strength of coating is higher than that of the matrix material, the coating has a low structural porosity and the hardness and friction performance of the die surface are somewhat improved. Compared with the original dies, not only their dimensional accuracy and quality standard are no lower but also their performance such as wear resistance and corrosion resistance are better, fully satisfying the requirements of die repair & remanufacture.
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