The routine maintenance and replacement of the operational A program is more convenient to repair, but the sleeve weight is about 70kg when replacing, and the disassembly and assembly requires more than two people and the special tools and the crane. The maintenance of the B program is inconvenient. And the set weight is about 105kg, it is very difficult to disassemble, and it needs the cooperation of many people and special tools and cranes. The C program is easy to repair and replace. Moreover, the circular ring block weighs only 15kg, and only one person is required for replacement. Therefore, Scheme C shows obvious advantages in the comparison of major projects, especially in terms of safety and reliability and operational operability.
We selected the C program to repair the lower mold base. In the C scheme, although the M20 tapped hole was repaired, the surface hardness of the toroidal bearing surface was improved, but the circular ring block was still fixed by the mold base M20 bolt. There is still no improvement in the overall mechanical properties and the joint strength of the bolts. This is the weakness of the C program. Therefore, the abnormal failure of the four M20 tapped holes will affect the service life of the repaired lower die holder. Therefore, each time you replace the mold of the lower mold forming station, you should carefully inspect the four M20 fastening bolts. If loose, tighten them in time. Replace bolts and washers if necessary to ensure reliable fastening and maximize the life of the mold base.
According to the C repair plan, the lower mold base weighing about 1.5t and worth 45,000 yuan was put back into use in March 1998. After nearly one year of production test, the repaired lower mold base has realized the expected goal of short repair cycle, low cost, safe and reliable structure, convenient inspection and maintenance, and played a role in our company's operation and production.
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