A kind of preparation method of balance shaft bracket casting

A balance shaft bracket and casting technology, which is applied in the field of preparation of balance shaft bracket castings, can solve the problems of shrinkage cavity, difficult machining, low heat conduction and heat storage capacity, etc., prevent the formation of oxidation pinholes, and improve the utilization rate of molten iron , The effect of strong heat conduction and heat storage capacity
CN110625066BActive Publication Date: 2021-12-21HUBEI XINGYUAN SCI & TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
HUBEI XINGYUAN SCI & TECH
Publication Date
2021-12-21

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Abstract

The invention provides a preparation method of a balance shaft support casting, which belongs to the technical field of balance shaft support castings. The present invention can accelerate the solidification speed of the molten iron at the position of the balance shaft support casting (hot spot) by placing the graphite chill at the position where defects are likely to occur in the casting of the balance shaft support, cancel the feeding riser, and reduce the shrinkage and shrinkage of the casting Significantly reduced, but also increased the utilization rate of molten iron.
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Description

technical field

[0001] The invention relates to the technical field of balance shaft brackets, in particular to a preparation method of a balance shaft bracket casting. Background technique

[0002] There are many types of balance shaft brackets for commercial vehicles, including heavy, medium and light models, all of which are made of ductile iron QT500-7. The product structure is basically similar, but the structure is more complex, the wall thickness is uneven, and there are many hot spots, so it is difficult to cast, especially the position of the installation hole on the bottom surface is prone to shrinkage porosity and shrinkage cavity defects, which leads to the scrapping of castings during processing, and the scrap rate is as high as 30% %. This also brings difficulties to machining. Internal shrinkage and shrinkage often break the drill bit and the hole position is out of tolerance.

[0003] The existing casting method of balance shaft bracket castings is: adding ...

Claims

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