金属浇铸就是将金属先熔化成液态,再将液态金属浇注到预先做好的铸型空腔中,冷却凝固后便获得具有一定形状和尺寸的铸件。

根据金属型铸造的某些特点，在设计浇注系统时须注意以下几点：金属浇注速度大，超过砂型的约20％。其次，在液 体金属充型时，型 腔里的气体要能顺利排除，其流向应尽可能与液流方向一致，顺利的将气体挤向冒口或出气冒口；此外，应注意使液体金属在充型时流动平稳，不产生涡流，不冲击型壁或型芯，更不可产生飞溅。

金属型的浇注系统一般分为顶注式底注式和侧注式三类。
1）顶注式，其热分布较合理，有利于顺序凝固，可减少金属液的消耗，但金属液流动不平稳，易进法，铸件高时，易冲击型胶底部或型芯。若用于浇注铝合金件，一般只适用于铸件高度小于100毫米的简单件；
2）底注式，金属液流动较平稳，有利于排气，但温度分布不合理，不利于铸件顺利凝固；
3）侧注式，兼有上述两者的优点，金属液流动平稳，便于集渣，排气等，但金属液消耗大，浇口清理工作量大。

金属型浇注系统的结构与砂型铸造基本相似，因此要求浇注系统结构，能有利于降低金属液流速，流动平稳，减少其对型壁的冲刷。除应保证型腔内气体有充裕的时间排除外，还保证在充型过程中不得产生喷溅。

The Aluminum Advantage

Aluminum is everywhere. The most abundant, naturally occurring metal in the earth’s crust, aluminum is an essential element of modern life.

The metal is so ubiquitous that many of us don’t even realize how often it touches our lives. In fact, people use more aluminum today than at any point in the 125-year history of the metal’s commercial production. Aluminum is so critical to modern mobility, increasing sustainability and the national economy that without it, many of the conveniences of today’s world would simply not exist.

 

Mobility

Innovative applications for aluminum are all around us. The car you drive to work most likely has an aluminum hood and other lightweight parts to drive fuel efficiency. Your house or office building likely uses aluminum windows and doors or maybe even a cool roof to improve insulation and decrease heating and cooling bills.

That airplane you fly in for summer vacation or that latest business trip would literally not be possible without lightweight aluminum as a key component. Increasingly, even the high-tech gadgets you use to keep in touch with friends and family make use of sleek, attractive aluminum casings.

Sustainability

Outside the day-to-day conveniences that aluminum provides, it is also the sustainable material of choice in many markets.

Lightweight, durable and infinitely recyclable, value-added aluminum products can lower energy costs and carbon emissions in dozens of applications. Coated aluminum roofs can reflect up to 95 percent of sunlight, dramatically increasing building energy efficiency.

Highly recycled and lightweight aluminum packaging can reduce shipping costs and carbon emissions for beverage makers.

Economy

Aluminum is an essential element to this country’s energy and manufacturing future.

The industry today supports 692,000 jobs and $174 billion in economic output in the United States—that’s nearly 1 percent of GDP. These high quality, advanced manufacturing jobs provide average compensation far exceeding the national average.

Demand for the metal is reaching record heights —up 45.1% percent since 2009. And the industry is poised for even greater success as more and more companies turn to aluminum as a solution to modern manufacturing challenges.;

Aluminum is truly the metal of modern life.