Cast sand core for cylinder cover of diesel engine

Abstract

The invention discloses a cast sand core for a cylinder cover of a diesel engine. The cast sand core comprises a composite overall sand core, a base plate core, an upper cover plate core and a casting auxiliary core, wherein the composite overall sand core comprises a base plate part, an air inlet channel part, an exhaust channel part, an upper water sleeve part, a lower water sleeve part, a tappet hole part and an exhaust system channel; the exhaust system channel is formed in the composite overall sand core; a sand removal window is formed in the bottom of the composite overall sand core; the base plate core comprises a core assembly frame position, a core assembly abdicating position, a sand core exhaust channel and a casting position; the core assembly frame position is used for accommodating the composite overall sand core; the sand core exhaust channel is communicated with the exhaust system channel; a first sprue is formed in the upper cover plate core; and the casting auxiliary core comprises a second sprue and a first cross gate. According to a casting method for the cylinder cover of the diesel engine by employing the composite overall sand core, the cylinder cover with an accurate shape and a uniform wall thickness can be obtained; and according to the cylinder cover of the diesel engine, the floating core phenomenon in casting of the air inlet cannel, the exhaust channel, the upper water sleeve and the lower water sleeve is avoided, a cylinder cover water cavity is free of a joint surface, a product casting is free of a water sleeve burr, and the water cavity is high in cleanliness.

Description

technical field [0001] The invention relates to the casting field of a diesel engine cylinder head, in particular to a casting sand core of a diesel engine cylinder head. Background technique [0002] Diesel engine cylinder head is the core component of diesel engine. The outside of the cylinder head has an outer shape, and the inside is composed of complex structures such as intake passages, exhaust passages, cooling water chambers, oil passages, and injector seats. The bottom surface of the cylinder head has structures such as intake valves and exhaust valves. A typical complex thin-walled box-type part is obtained by casting the blank. [0003] The existing diesel engine cylinder head is composed of a chassis core, a lower water jacket core, an air intake core, an exhaust core, an upper water jacket core, a tappet hole core, and a cover disc core. . During the assembly process, the 6 types of sand cores cannot be assembled accurately and precisely due to factors such a...

AI Technical Summary

Problems solved by technology

During the assembly process, the 6 types of sand cores cannot be assembled accurately and precisely due to factors such as gaps and offsets, resulting in uneven wall thickness; especially the assembly and positioning of the sand cores for the intake and exhaust passages and the sand core for the chassis. To prevent the sand cores of the intake and exhaust passages from floating up under the buoyancy of molten iron during the casting process, the measures adopted are usually to apply glue to the head of the intake and exhaust passages of the chassis core, and then use the sand cores of the intake and exhaust passages to The screw fastening method fastens the intake and exhaust channels to the chassis core, but this method is not only complicated but also cannot fundamentally solve the disadvantages of the sand core floating up after the high-temperature molten metal is filled, thus affecting the positioning of the intake and exhaust channels in the casting. The correct position of the airway becomes the main factor affecting the consistency of the airway parameters in the long run, which in turn affects the performance of the intake and exhaust passages

This kind of production method is mostly used for familiar products. Its mold design and manufacturing costs are high and the manufacturing cycle is long, which cannot meet the rapid production and manufacturing of diesel engine cylinder heads. Especially in the process of new product development and verification, its verification speed can no longer be achieved. Meet the rapid manufacturing and rapid verification of new products

The trial production of new products affects the development cycle of new products; and due to uncertain factors such as change and optimization of new products, it will cause changes in molds, which may lead to scrapping of molds in severe cases

Therefore, the existing diesel engine cylinder head casting methods cannot meet the requirements of rapid prototype casting verification of new products and the requirements of small batch rapid manufacturing.

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