Bottom casting system of strip sectional inner runners

Abstract

The invention discloses a bottom casting system of strip sectional inner runners, and belongs to the technical field of casting. The conventional casting system causes high sand-iron ratio, shrinkage cavity and shrinkage porosity defects and casting scraps by using a ceramic pipe as an inner runner. The system comprises a straight runner, a transverse runner, at least two inner runners and a die cavity which are communicated, wherein the transverse runner and the inner runners are positioned below the die cavity; and the inner runners are vertical and communicated with the transverse runner from the bottom of the die cavity. The system is characterized in that: the inner runners have strip cross sections formed by casting sand. The inner runners have strip sections so that the section area of the inner runners can be enlarged and the casting speed of large castings is ensured; the inner runners are made of casting sand, so the production cost can be reduced, breaking and cracking are not caused during use, and casting scraps are avoided; and the cross sections of the inner runners have high length-width ratio and few contact heat sections, so shrinkage cavity and shrinkage porosity defects at the contact part are avoided.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a bottom pouring type pouring system for a band-shaped cross-section inner runner. Background technique [0002] In casting technology, injecting molten metal into the cavity requires a channel, usually called a gating system. The gating system generally consists of sprue, runner and inner runner. Large castings often use a bottom pour gating system, that is, the molten metal is injected into the cavity from the bottom of the cavity. This gating system fills the mold smoothly and is not prone to turbulence and splashing. The opening method of the inner runner of the bottom pouring gating system In actual production, the ceramic tube is often used as the inner runner to introduce the molten metal into the cavity. The cross-section of the ceramic tube is circular, and there are the following disadvantages when used: ①The size of the cross-sectional area of ​​the inne...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved and the technical task proposed by the present invention are to overcome the disadvantages of high sand-iron ratio, easy to cause shrinkage cavity and shrinkage defects, and scrapped castings caused by using porcelain tubes as inner runners in the existing gating system, and provide a casting with Bottom pouring gating system with shaped cross-section inner runner

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