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Research on the relationship between sprue conditions and casting defects by means of observation of the titanium flow in a mold cavity

通过观察型腔内钛的流动研究浇道条件与铸造缺陷的关系

基本信息

批准号：
03807128
负责人：
WATANABE Kouichi
金额：
$ 1.09万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

By means of the tracer element molten method, the titanium flow behavior in the mold cavity can be clarified and the obtained results provide the mechanism of the several defects of titanium castings.In this period, we investigate the relationship between the casting defects and the titanium flow affected by the sprue conditions. The characterization of a centrifugal casting machine has become clear because of its laminar flow. In spite of the casting mechanism of each casting machine, pressure casting machine or centrifugal casting machine, the molten titanium was moved partly by its velocity obtained in sprue and partly by the internal pressure. Each part has been governed by the shape of the cavity, casting machine, and flow condition (laminar or turbulent). In thick plate, even in the case of the pressure casting machine, molten titanium moves by its velocity because of small flow resistance. The pipe like casting was made by the part of molten titanium which obtained the excess velocity. In the mesh type cavity, the internal pressure of the molten titanium was very important for smooth flow and castability. Furthermore, each part of the casting areas which were moved by the driving force of either the velocity or the internal pressure was very clear by the use of the centrifugal casting. In conclusion, when we investigate the complete titanium casting, we must always concern the driving force, the velocity of molten titanium or the internal pressure.

本文采用示踪元素熔融法研究了钛合金在型腔内的流动行为，揭示了钛合金铸件缺陷产生的机理，并研究了直浇道条件对钛合金流动的影响与铸件缺陷的关系。离心铸造机的特征由于其层流而变得清晰。不管每种铸造机、压力铸造机或离心铸造机的铸造机构如何，熔融钛部分地通过其在浇道中获得的速度移动，部分地通过内部压力移动。每个零件都由型腔的形状、铸造机和流动条件（层流或湍流）控制。在厚板中，即使在压力铸造机的情况下，由于流动阻力小，熔融钛也以其速度移动。利用获得超高速的部分钛液制成管状铸件。在网状型腔中，钛液的内压对钛液的平稳流动和可铸性至关重要。此外，通过使用离心铸造，由速度或内压的驱动力移动的铸造区域的每个部分都非常清楚。总之，在研究钛合金整体铸造时，必须始终关注钛液的流动速度或内压。