Manufacturing process of intermediate casting of diesel engine

Abstract

The invention discloses a manufacturing process of an intermediate casting of a diesel engine. The manufacturing process is characterized by comprising the following basic steps of: designing the manufacturing process; manufacturing a die; assembling the die; smelting; pouring; opening a box; shaking out; shoveling sand; cutting a feed head; supplementing; coarsely cleaning; spraying; performing shot blasting; performing hogging machining; performing comprehensive MT and UT; remedying defects; thermally processing; spraying; performing shot blasting; roughly machining; inspecting by classification society; and finally inspecting. According to the manufacturing process, PROCAST casting process simulating die software is utilized to perform simulated calculation, the casting process can be optimized based on the simulation result, and thus the inner quality of the casting can meet the technical requirement; and the smelting process, welding process, thermal processing process, formulation of rough processing process, research and development of an inspection route, and other works are accomplished.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a manufacturing process of a diesel engine intermediate casting. Background technique [0002] Diesel engine cast steel intermediate is one of the key components of marine low-speed high-power diesel engine. The intermediate through-bolt hole belongs to the elongated hole, and the casting of the elongated hole has always been a difficult problem in casting production. In the existing casting method, a thick-walled seamless steel pipe is used to make a water-cooled mandrel, and the water-cooled mandrel is cooled by passing through the water-cooled mandrel during or after casting. The disadvantage is: serious waste of water resources and increased costs. [0003] The wall thickness of the intermediate body has a large difference, and the casting produces a large shrinkage stress during the solidification process, which is prone to hot cracks, especially at the arc transition ...

AI Technical Summary

Problems solved by technology

The disadvantage is: serious waste of water resources, increased costs

[0007] 3) The flaw detection standard is high, and the main body needs to do magnetic particle flaw detection and ultrasonic flaw detection, which must meet the different flaw detection level requirements of different parts in the technical documents;

[0008] 4) The heat treatment is difficult, the wall of the casting is thick, the casting state is easy to appear and difficult to eliminate, and it is easy to produce coarse grains and uneven structure. At the same time, this will also bring certain difficulties to the follow-up flaw detection work