Core-making method and casting method of cylinder head oil channel sand core for making riser

Abstract

The invention discloses a core manufacturing method of a riser oil duct sand core during cylinder cover casting. An exhaust needle is designed on a core box, so that the final riser oil duct sand core can enable gas to be conveniently discharged during the cylinder cover casting, and a high-quality cylinder cover casting piece is obtained; meanwhile, a bonder-phenolic resin is mixed with polyisocyanate according to a ratio, triethylamine is added by blowing, and the core is manufactured on a special cold-box core blower. The obtained sand core is high in strength and good in knockout performance. Sand cores with different complexities and sizes can be manufactured. The invention further discloses a cylinder cover casting method utilizing the riser oil duct sand core manufactured by the method. In addition to the utilization of the riser oil duct sand core with a cavity, processes are reasonably arranged and process conditions are accurately controlled, so that the labor intensity of workers is reduced, the production efficiency is improved, the obtained cylinder cover casting piece is high in structure density, good in quality and high in finished product rate, and the defects of high possibility of forming pores, shrinkage porosity and misrun are effectively avoided.

Description

technical field [0001] The invention relates to the field of metal casting, in particular to a core-making method for making a riser oil passage sand core for a cylinder head, and a method for casting a cylinder head by using the prepared riser oil passage sand core. Background technique [0002] The cylinder head is a key part of the engine, and its outer contour is about 420mm×300mm×150mm. Customers require castings with high dimensional accuracy, smooth appearance, and clear and complete contours; the internal structure of castings is dense, and there are no casting defects such as pores and shrinkage porosity. However, since the average wall thickness of the casting is in the range of 4-5mm, there are many isolated and thick structures with a wall thickness difference of more than 2 times, and the water jacket core has a large amount of gas generation, and due to structural limitations, it cannot be effectively exhausted. Therefore, casting is more difficult, and pores ...

AI Technical Summary

Problems solved by technology

However, since the average wall thickness of the casting is in the range of 4-5mm, there are many isolated and thick structures with a wall thickness difference of more than 2 times, and the water jacket core has a large amount of gas generation, and due to structural limitations, it cannot be effectively exhausted. Therefore, it is difficult to cast, and it is easy to produce pores and shrinkage defects.

Images