Bottom casting system of strip sectional inner runners

A technology of gating system and inner runner, which is applied in the direction of casting molding equipment, molds, cores, etc., can solve the problems of shrinkage cavity and shrinkage castings, scrapping, high sand-iron ratio, etc., and achieve small contact heat joints and reduce production The effect of low cost and low sand-iron ratio

CN101966560BActive Publication Date: 2012-07-18ZHEJIANG JIALI WIND POWER TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-07-18

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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.
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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...

Examples

Embodiment Construction

[0011] The present invention will be further described below through a preferred embodiment in conjunction with the accompanying drawings.

[0012] The bottom pouring type pouring system of the belt-shaped cross-section inner runner of the present invention, such as figure 1 , 2 As shown, it includes a connected sprue 1, a runner 2, at least two ingates 3, and a cavity 4. The runner 2 and the ingate 3 are located below the cavity 4, and the ingate 3 is in the form of The runner 2 is connected vertically and from the bottom of the cavity 4, and the inner runner 3 is made of molding sand to form a strip-shaped cross section. The strip-shaped cross-section refers to the fact that the length L of the cross-section is greater than the width D of the cross-section, especially the aspect ratio of the cross-section of the ingate (that is, the ratio of the length L of the cross-section to the width D of the cross-section) is 3 :1 to 12:1, during specific implementation, the cross-sec...