Large-duty loader hydraulic valve body casting mold and manufacturing method

Abstract

The invention discloses a large-duty loader hydraulic valve body casting mold. The large-duty loader hydraulic valve body casting mold comprises an upper shell mold body, a lower shell mold body, a sand core and a pouring and riser system. The sand core comprises a core head, a main core body and small core bodies. The main core body is composed of seven longitudinal arbors and four transverse arbors, and the longitudinal arbors and the transverse arbors are horizontally arranged in the same plane. The main core is provided with a plurality of convex blocks. Installation grooves are formed in the convex blocks. The small core bodies are fixed to the main core body through the installation grooves. The pouring and riser system comprises two exothermic and insulating risers with the diameter being 90 mm and the height being 120 mm. The large-duty loader hydraulic valve body casting mold has the advantages of being reasonable and compact in structure, high in reliability and convenient to assemble and cast, the straightness of a blank casted through a main valve hole is controlled to be smaller than 0.8 mm, assembly errors of a complex sand core are avoided, the casting defects of shrinkage cavities, shrinkage porosity, internal pores and the like of a casting piece are overcome, and the compactness of the internal structure is improved, so that leakage is avoided under a high-pressure working condition with the rated pressure being larger than or equal to 35 Mpa; and the casting qualified rate is improved greatly, and the casting cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of mechanical equipment manufacturing, in particular to a large loader hydraulic valve body casting mold and a manufacturing method. Background technique [0002] Most of today’s large loaders have hydraulic control systems. The hydraulic system consists of hydraulic pumps, control valves, hydraulic cylinders, hydraulic motors, pipelines, oil tanks, etc. The hydraulic transmission system transmits the power of the engine to the hydraulic through the hydraulic pump Actuating components such as motors and hydraulic cylinders push the working device to complete various tasks. [0003] The hydraulic valve is a key component of the hydraulic system. The structure and accuracy of the hydraulic valve of a large loader are very high, and it is required to have no leakage under the high pressure working condition of pressure ≥ 35Mpa. [0004] Because the internal flow channel structure of the valve body casting is complicate...

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Problems solved by technology

[0004] Due to the complex structure of the internal channel of the valve body casting, it cannot be formed at one time. The sand core needs to be assembled in multiple steps through the main core and many small cores. During the assembly process, clearance errors often occur, and the castings will have shrinkage cavities. Casting defects such as shrinkage porosity and internal pores cannot guarantee the compactness of the internal structure, and leakage is prone to occur under high-pressure working conditions with a pressure ≥ 35Mpa, resulting in low casting pass rate and high casting cost

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