Ventilation cooling sand core for casting cylinder jacket of diesel engine and manufacturing method thereof

Abstract

The invention discloses a ventilation cooling sand core for casting a cylinder jacket of a diesel engine. The ventilation cooling sand core comprises a core shell, a core bar and a ventilation rope, wherein the core bar comprises a sleeved inner steel pipe and a longer outer steel pipe; the upper ends of the inner steel pipe and the outer steel pipe are fixed together with a first ring-shaped steel plate; multiple upper vent holes are arranged at the upper end of the inner steel pipe; the lower end of the inner steel pipe is fixed together with the upper surface of a second ring-shaped steel plate; the inner opening of the second ring-shaped steel plate is downward connected with a hopper-shaped conical steel pipe and provided with multiple lower vent holes; a bottom sealing plate is fixed at the lower end of the outer steel pipe; a cold air cavity is formed among the outer steel pipe, the bottom sealing plate and the hopper-shaped conical steel pipe; the central inner ring of the first ring-shaped steel plate is upward fixedly provided with a first steel pipe; the first steel pipe, the inner steel pipe and the hopper-shaped conical steel pipe form an insertion channel of a cooling ventilation pipe; and the space among the lower vent holes, the inner steel pipe and the outer steel pipe and an upper air outlet form a hot air channel. According to the invention, the core manufacturing efficiency is improved, the qualification rate of the cylinder jacket is increased, the quality of the cylinder jacket is stabilized, and the production cost is lowered.

Description

technical field [0001] The invention relates to the field of marine diesel engines, in particular to a ventilating and cooling sand core for casting cylinder liners of diesel engines and a manufacturing method thereof. Background technique [0002] The cylinder liner is one of the key parts of the diesel engine, and the casting quality (wear resistance, safety) of the cylinder liner directly affects the quality of the diesel engine. Since the cylinder liner has a cylindrical structure, the inner wall of the casting cannot dissipate heat during the solidification process, and the final solidification position of the casting is close to the inner wall of the casting. After finishing, the inner wall of the cylinder liner is prone to looseness and uneven distribution of hard phases, which reduces the wear resistance. Therefore, the existing technology is to place a large amount of cold iron on the inner wall for chilling. However, the increase of cold iron increases the worklo...

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Problems solved by technology

However, the increase of cold iron increases the workload of core making on the one hand, and on the other hand, it also causes fluctuations in the quality of the cylinder liner because the molding sand between the cold iron is not easy to compact

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