Casting riser structure for upper end surface-sealed castings and construction method thereof

Abstract

The invention discloses a casting riser structure for upper end surface-sealed castings and a construction method thereof, which solve the technical problem that the internal structure index and surface index of castings cannot come up to requirements because a riser structure for the low-pressure and counter-pressure casting of aluminium alloy of upper end surface-sealed castings is unreasonable.The casting riser structure comprises a cross gate (1), sprues (2), and sidewall slot pouring gates (3), a slot pouring gate type riser (4) is arranged between each two sidewall slot pouring gates (3), each slot pouring gate type riser is composed of a lower slot pouring gate slot (5) and an upper molten metal storage area (6), and the upper molten metal storage areas (6) communicate with the sidewall slot pouring gates (3) via the slot pouring gate slots. A chiller (7) is arranged between each two slot pouring gate type risers (4). The invention integrates the functions of the slot pouring gates and the risers together, solving the defect of upper end surface-sealed structural parts existing in the process of counter-pressure and low-pressure casting, and the yield of cast structural parts can be increased to 95 percent or more.

Description

technical field [0001] The invention relates to an aluminum alloy low-differential pressure casting, in particular to a riser structure and a construction method of an aluminum alloy low-differential pressure casting with an upper end surface closed casting. Background technique [0002] In the aluminum alloy low and differential pressure casting process, the upper end faces of some casted structural parts are closed, and the area of ​​the closed upper end faces is relatively large, and the upper end faces are still important bearing parts. Various casting technical indicators The requirements are relatively high. After casting, the internal structure is not allowed to have casting defects such as shrinkage cavity, shrinkage porosity, pores, loose dispersion, pinholes, coarse grains and segregation. The mechanical performance requirements: σb≥300MPa, σb 0.2 ≥260MPa, δ 5 ≥5%, discrete value of strength ≤8%, discrete value of elongation ≤30%; surface quality requirements: bla...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a casting riser structure and construction method of a casting with a closed upper surface, which solves the problem of low differential pressure casting of an aluminum alloy casting with a closed upper surface During the process, the unreasonable riser structure is likely to cause technical problems of stress concentration in structural parts

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