Forming technology of air cylinder cover casting

Abstract

The invention discloses a forming technology of an air cylinder cover casting. The forming technology of the air cylinder cover casting comprises the following steps of: firstly modeling the appearance profile and a sand core of the cylinder cover casting by adopting precoated sand; then assembling an outer model and the sand core and putting into a sand box; and then filling in dry sand or dry stones for pouring. According to the invention, the technology of combining precoated sand modeling and dry sand (stone) mold casting is adopted, the outer model moulding sand is molded and is assembled with the moulding sand, and is put into the sand box, the mold thickness adopts dry sand/stones to replace resin sand completely, and pouring is carried out after the dry sand/stones is/are compacted. Because the dry sand (stone) has no bonding agent and has good permeability, gases generated during pouring can be exhausted rapidly and smoothly; mold filling is stable; and because the metal liquids at the upper part are lower than metal liquids at the lower part, sequential condensation and dead head feeding are carried out smoothly; the mold-filling capacity is high; defects of cavity shrinkage, shrinkage porosity, incapability of pouring and the like can be prevented easily; and moreover, one-mold multi-element processing is easy to realize, and the production efficiency and casting technology yield are improved.

Description

technical field [0001] The invention relates to the field of casting processing, in particular to a forming process of cylinder head castings Background technique [0002] At present, the manufacturing level of engine block and cylinder head is one of the important symbols to measure the manufacturing level of a country, and it also represents the development level of a country's automobile industry to a large extent. Constantly improving engine power, reducing fuel consumption and reducing exhaust emissions are the internal needs of the auto industry's own development and the objective requirements of the external environment. The cylinder head has a great influence on many technical parameters of the engine, so it requires high dimensional accuracy and strict requirements on the quality of the inner and outer surfaces; Repeated and rapid changes, alternating thermal stress due to continuous expansion and contraction, easily lead to fatigue failure, so the cylinder head ca...

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