Cylinder head manufacturing die based on green sand process

Abstract

The invention provides a cylinder head manufacturing die based on a green sand process for solving the problem of a sand hole defect of a casting as loose sand flows into the casting because a tappetcore collides with a sand mould and extrudes the sand mould. The cylinder head manufacturing die comprises an upper die, a lower die, the tappet core, the sand mould, a tray core and a combination core. The cylinder head manufacturing die is characterized in that two guide holes where a lower core head of the tappet core passes are formed in the tray core, notches corresponding to the guide holesin position are formed in the sand mould, sand collecting grooves are formed in the notches, and the sand collecting grooves of annular groove structures are formed in the bottoms of the inner walls of the notches. By adopting the technical scheme, the tappet core does not collide with and extrude the sand mould, so that the tendency that the cylinder head has and hole defect is reduced.

Description

technical field [0001] The invention belongs to the technical field of cylinder head casting, and in particular relates to a mold for manufacturing a cylinder head based on a green sand process. Background technique [0002] The function of the cylinder head is to seal the cylinder, form a combustion space together with the piston, and bear the force of high-temperature and high-pressure gas, which requires the cylinder head to have a compact structure and no trachoma defects. At present, the mainstream production method of cylinder head is mass production using green sand process, and its casting process generally includes core making, molding, core setting, box closing, pouring, cleaning, etc. Green sand is the most widely used and most convenient molding method, which has the advantages of low cost, high production efficiency, and easy realization of mechanization and automation. However, the disadvantages of green sand are also obvious, that is, the strength of the sand...

AI Technical Summary

Problems solved by technology

[0004] (1) The material of the tappet core is coated sand with high strength, while the material of the sand mold is wet sand with relatively low strength. When the tappet core is matched with the sand mold, the high-strength tappet core is easy to crush the low-strength sand mold , the loose sand produced caused the defects of sand holes in castings;

[0005] (2) Due to the slender structure of the lifter core and the complex structure of the combined core, the operator cannot effectively observe the cooperation between the lower core head of the lifter core and the sand mold through the combined core when lowering the lifter core, resulting in the lowering of the lifter core. The core head collides with the sand mold and squeezes, resulting in sand hole defects in the casting;

[0006] (3) In order to prevent sand extrusion, the casting process design requires that the minimum fit gap between the sand core and the sand mold can only be 0.3mm. When the tappet core is dumped in the sand mold, even if the lower core head only has a gap of 0.3mm, It will also cause an eccentric distance of about 2mm at the position of the upper core head of the tappet core, resulting in sand hole defects caused by the upper core head of the tappet core and the sand mold being squeezed

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