Metal section mould with controllable cross section and gravity slantingly-rotated foundry technique of aluminum alloy cylinder cover of metal section mould

Abstract

The invention discloses a metal section mould with a controllable cross section and a gravity slantly-rotated foundry technique of an aluminum alloy cylinder cover of the metal section mould. The metal section mould comprises a pouring cup (1), a dead head sand core (2), a molding module (3), an ejector device (4), a water cooling device (5) and a negative pressure air extractor (6), and a control cross section retaining plate (7) is installed at the intersection position of the pouring cup and the dead head sand core on the lower portion of the pouring cup (1). Molten aluminum can only enter a casting cavity from a dead head beside an air inlet lateral cover due to retaining functions of the control cross section retaining plate in a slantingly-rotated pouring process, then the molten aluminum is discharged from a dead head at the position of a middle spark plug and a dead head beside an air discharge lateral cover, stable molten aluminum mold filling in a mold filling process is achieved, a principle of mold filling sequence and air inlet and air outlet in sequence is followed, the whole mold filling speed and time of a casting piece are controlled by controlling the minimum mold filling cross section of the pouring cup, defects such as air holes, shrinkage holes and shrinkage porosities produced by an original piece are obviously overcome, and accordingly product yield, acceptability and quality of the metal casting piece are improved.

Description

technical field [0001] The invention relates to a metal mold for aluminum alloy casting technology and the aluminum alloy cylinder head casting technology thereof. Background technique [0002] The structure of the cylinder head of an automobile engine is complex, consisting of multi-layer cavities, and no leakage is allowed in each cavity, and its wall thickness is uneven, making casting difficult. At present, the casting process methods for producing engine aluminum cylinder heads at home and abroad include metal mold gravity casting process, low pressure casting process, special low pressure casting process, lost foam casting process, sand mold low pressure casting process, metal type gravity tilting casting process, etc. : Metal mold gravity casting process and low pressure casting process are traditional, mature, and most used methods of casting aluminum alloys, and metal mold gravity tilting casting process is a gradually mature and widely used new technology. However...

AI Technical Summary

Problems solved by technology

However, metal type gravity casting has defects such as long mold production cycle, high cost, low cylinder head yield, and easy shrinkage and porosity. Easy to produce defects such as pores, shrinkage cavities and shrinkage porosity

[0003] The metal mold used in the above-mentioned metal mold gravity tilting casting aluminum cylinder head process includes sprue cup, riser sand core, molding module, ejector device, water cooling device, negative pressure suction device, etc. The sprue cup In the process of gravity tilting pouring, while the liquid aluminum will enter the casting cavity from the side riser of the intake side cover, part of the liquid aluminum will flow directly over the sand core of the riser into the riser of the middle spark plug, and then flow from the middle spark plug. The mouth enters the casting cavity, so that the molten aluminum entering from the side riser of the intake side cover and the riser of the middle spark plug will cause turbulent flow in the casting cavity, and at the same time, the molten aluminum entering from the riser of the middle spark plug will affect the casting. The discharge of gas in the cavity leads to the occurrence of air hole defects in the cylinder head castings, which affects the yield and quality of the castings

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