Advantages of new mold surfacing technology

The earliest mold surfacing repair was used in aviation, aerospace and military fields, and later widely used in industrial fields. It is a relatively mature technology. Die surfacing repair is widely used in EU countries and has been introduced to the country for about 10 years. Since it can greatly reduce production costs, domestic die forging companies are vying to adopt it.

　　 The current domestic die forging surfacing repair process is generally: pre-welding cavity cleaning mold 450 ℃ preheating welding after welding 450 ℃ normalizing air cooling 530-570 ℃ tempering (1-2 times) air cooling to room temperature machine Processing. The newer mold surfacing technology omits the tempering process, which has obvious advantages:

　　1, save time

　　 The tempering process is omitted, and the subsequent heating, heat preservation, and slow cooling process are also omitted, which can save 2-5 days of processing time.

　　2. Increasing the utilization rate of electric furnace (Guide: Analysis of machine tool casting repair)

　　 The tempering process is omitted, only 450℃ normalization is carried out. The normalization temperature and the mold preheating temperature are the same at 450℃, so that the preheating and normalization can be carried out in the same electric furnace, and the mold can be continuously performed regardless of batches. Put it in an electric furnace, which improves the speed of mold repair and the utilization rate of the electric furnace.

　　3, mold base material cost reduction

　　The general material of domestic large and medium-sized molds is 5CrNiMo. This material has average red hardness, and the hardness will be greatly reduced with welding repair, and the life of the mold will also be reduced. The new mold can only be normalized at 450°C to fundamentally solve this problem. The cost of the base material is greatly reduced, and the service life is increased by 30-50%.

　　4, reduce the use of welding consumables

　　 New mold surfacing technology Because the hardness of the base material is guaranteed, the mold base material generally only needs to weld 12mm thick welding material, which reduces the amount of welding material used for mold repair.

　　5. Reduce machining costs

　　The hardness of the welding material used in the new mold surfacing technology is lower than that of the original welding material. After welding, the hardness of the large and medium-sized molds is 45HRC, and the hardness of the small molds is around 52HRC. This is very beneficial for machining and accepts man-hours and tool costs.

　　 This updated technology not only saves a lot of die costs for forging companies, but also improves production efficiency and reduces subsequent processing costs for forgings. It is believed that more forging companies will adopt this technology.

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