Casting technique for bracket casting of marine pod-type electric propulsion system

Abstract

The invention relates to a casting technique, in particular to a casting technique for bracket casting of a marine pod-type electric propulsion system, characterized by comprising the following steps of: designing a three-dimensional technique, performing analog simulation conformation on the casting technique, manufacturing a mould and a sand box tool set, horizontally configuring, manufacturing a core, assembling the core and closing the box, pouring, cooling and opening the box. The casting technique provided by the invention has the advantages of improving the casting cleanness, reducing the shrinkage defects, meeting a wall thickness demand, satisfying UT and MT flaw detection demands, reducing the production cost, and realizing safe production and excellent batch production of bracket casting.

Description

technical field [0001] The invention relates to a casting process, in particular to a casting process for a bracket casting of a marine pod type electric propulsion system. Background technique [0002] The pod-type electric propulsion system has first-class hydrodynamic force and operating efficiency. It integrates the functions of slurry and rudder, and can realize 360° rotation of large ships in situ, and precise GPS positioning. It is mainly installed on ocean-going scientific research ships and deep-water drilling ships. On large high-tech ships such as ice-breaking offshore support ships, the electric propulsion system has occupied more than half of the global pod propulsion device market. The bracket casting is a key part of the propulsion module of the pod-type electric propulsion system. It is installed at the rear of the ship, soaked in water, and can rotate 360°. The material is EN-GJS-400-18U-LT. , UT, MT, PT and other inspections. [0003] Casting weight 5000-...

AI Technical Summary

Problems solved by technology

Both ends of the casting are large, and the flat and thin fish-shaped connection in the middle is a streamlined structure. The fish-shaped aspect ratio is (4-5): 1. The sand core is easy to deform and difficult to fix, and the wall thickness of the casting is not easy to guarantee.

At present, this kind of casting adopts the process of flat pouring. Due to the great difference in height between the two ends of the casting, the flat and large plane in the middle, and the flat and thin core in the inner cavity is bent upward by the buoyancy of the molten iron, it cannot guarantee the wall thickness of the casting is 55±5 mm. The range of deviation requirements; the molten iron filling is turbulent and convective in the cavity, and a large area is in contact with air to oxidize, and there are many slags on the castings, which is difficult to meet the requirements of MT flaw detection