The era of cycling seems to have become a thing of the past. Today, in a busy city, more and more people have chosen cars and buses. Since the initiation of green life, bicycles have reappeared in people's eyes.
The biggest benefit of cycling is "aerobic exercise." The most important feature of "aerobic exercise" is "increasing cardiopulmonary function" and "reducing fat," and "increasing cardiopulmonary function," of course, will also enhance physical fitness. Cyclists not only use the movement of the legs to compress the blood flow, but also draw the blood from the end of the blood vessels back to the heart. In fact, they also strengthen the microvascular tissue. This is called an "incidental cycle." Strengthening blood vessels can keep you from being threatened by age and youth. Research shows that cycling exercise extends life!
A recent study in the United Kingdom also showed that regular cyclists have a health condition equivalent to 10 years younger than their own, while those who still insist on regular cycling in their 30s can increase their life expectancy by an average of 2 years. .
Lu Yifan, a professor of sports medicine at the Sports University of Beijing Sports University, points out that cycling, like running and swimming, is an endurance exercise that can improve people's heart and lung function. It can not only train muscles and joints, lose weight, and evenly build, but also strengthen the heart and prevent high blood pressure. It can also prevent brain aging and improve the agility of the nervous system. "Hi bikes will accelerate blood circulation, allowing the brain to take in more oxygen and stay awake thinking."
"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."
Gravity Die Casting
Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.
The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.
GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.
There are three key stages in the process.
- The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
- Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
- Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.
Advantages
- Good dimensional accuracy
- Smoother cast surface finish than sand casting
- Improved mechanical properties compared to sand casting
- Thinner walls can be cast compared to sand casting
- Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
- Steel pins and inserts can be cast in to the part
- Faster production times compared to other processes.
- Once the tolling is proven, the product quality is very repeatable.
- Outsourced Tooling setup costs can be lower than sand casting.
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