ã€China Aluminum Industry Network】 Aluminum alloy die steel die casting die will produce cracks after a period of production. After analysis, the following are the main reasons for this phenomenon: (1) mold temperature is too high stress is too large (2) mold mold material use 8407, skd61 (3) mold heat treatment hardness is too high (4) Regular maintenance, 5ktimes1 tempering, 15ktimes1 tempering 30ktimes........ To prevent cracking in die casting molds and improve the service life of imported die steels? 1. Heat treatment requirements for die-casting molds (dynamic molds and cores) Hardness must be guaranteed at HRC 43-48 (materials can be SKD 61 or 8407) 2. The mold should be fully preheated before the production of die-casting. Its function is as follows: 2.1 to achieve a good thermal balance of the mold? Make the casting solidification speed and conducive to pressure transfer. 2.2 Maintain the fluidity of the die-casting alloy filled with good moldability and improve the surface quality of the casting. 2.3 Reduce early production failures and increase die casting productivity. 2.4 Reduce the thermal stress of the mold and improve the service life of the mold. The specific specifications are as follows: Alloy Type Aluminum Alloy Zinc Alloy Mold preheating temperature (°C) 3. After the new mold has been in production for a period of time, the accumulation of thermal stress is the direct cause of cracks in the mold core. To reduce the thermal stress, the mold core and slider after a certain period of production should be tempered to eliminate thermal stress. specific Need to eliminate the thermal stress production model as follows? The mold type is tempered by the previous tempering. The second tempering is the third tempering. Aluminum alloy <2000 molds <10000 molds <30000 molds Zinc alloy <10000 molds <20000 molds <50000 molds 20 points for long life of the mold: 1, high quality molding materials 2, reasonable design mold wall thickness and other mold size 3, try to use the insert end of the home page 4, in the possible conditions, choose the largest possible corner R 5, the spacing of the cooling water channel and the profile and corner must be large enough 6, after the rough processing should go to stress tempering 7, the correct heat treatment, quenching cooling should be fast enough 8, thoroughly polished to remove the EDM enamel layer 9, the profile can not be highly polished 10, mold surface should be oxidized 11, if the election nitriding, seepage layer can not be too deep 12. Preheat the mold to the recommended temperature in the correct way 13, start the die casting 5 - 10 should use the slow hammer speed 14, as far as possible under the premise of qualified products to reduce the temperature of liquid aluminum 15, do not use too high aluminum injection speed 16, to ensure that the mold is properly cooled, the cooling water temperature should be maintained at 40 - 50 °C 17, temporary shutdown, should try to close the mold and reduce the amount of cooling water, to avoid the mold to withstand thermal shock when the boot 18. When the model surface is at a higher temperature, shut off the coolant 19, but more spray mold agent 20, to stress and temper after a certain number of die-casting LED floor lamps have become a popular lighting choice for homeowners looking to modernize their living spaces. With their sleek designs and energy-saving capabilities, these floor lamps offer various benefits to homeowners looking to upgrade their lighting. Among these benefits include dimmable floor lamp options, corner floor lamp placement, and tall floor lamps for added illumination in any room. Additionally, modern floor lamps for living rooms are available in various colors and styles, making them perfect for any interior design choice. Overall, LED floor lamps offer an excellent lighting solution for homeowners looking to enhance their living spaces without compromising on their style or energy bills. dimmable floor lamp,corner floor lamp,tall floor lamps,modern floor lamps for living room Ningbo Le Monde Lighting Co.,Ltd , http://www.shineverlighting.com
Analysis of Causes for Cracks in Aluminum Alloy Dies and Preventive Measures