Though lost foam casting started earlier in China, its progress has been slow. Until the early 1990s, it has carried out some research work. But the research about lost foam casting supplies was a blank at that time. Casting factories basically took use of ordinary EPS packaging materials or imported some expensive special lost EPS raw materials. This situation seriously restricts the development of lost foam casting technology in China. In order to change the backward condition on lost foam casting supplies and casting production in China, in the late 90s we began to research new materials for lost foam casting supplies.
Reviewing these ten years of history, the research work about lost foam casting supplies has roughly experienced the following two phases: The first phase, the initial stage goal is to develop new materials EPMMA, but synthetic EPMMA beads have a lot of problems in the application. Beads of pretest and shape are difficult, and in the process of pouring shape,gas is easy to jet. With small demand of the EPMMA, research work cannot proceed.
The second stage is about copolymer resin research of STMMA. After several years of efforts, a series of technical challenges have been overcome. In three years we complete the test to trial production and application research, then gradually we put the new products into the market at home and abroad.
lost foam casting has a very detailed process during its making. Firstly, we need to produce some empty foam model to make a complete casting system, then brush the tailor-made painting on the pervaporation and need to be totally dried.
Secondly, we need to install the tailor-made inter-layer sand box on the vibration table which should be filled with dried sand. Then make the bottom sand hard enough on the vibration table, smoothing and filling sand around it after putting the dried pervaporation on the bottom sand.
Thirdly of the lost foam casting technological process, the top of the sand box need to be covered with plastic film. Using the pouring cup to inhaling the air from the box. Then we could start to pour metal inside after the dried sand is hard enough and be shaped.
At last of the lost foam casting technological process, we need to release the vacuum. After the condensation of the casting which should be turn over which will make it easier to take out the casting mold from the box.
In a word, the process of lost foam casting is a complex process which need high technology and time but worm welcomed by the factories since the low costs. But the choose of foam and casting materials are also important to the final result of the lost form casting.
China in 513 BC, cast the earliest written records of cast iron parts of the world – the state of Jin cast cauldrons and weighs about 270 kilograms.craft has reached a quite high level, Casting refers to the solid metal melt as liquid into the specific shape of the casting, awaiting the coagulation process, processing way of solidification, include: cast iron parts, cast copper parts,cast aluminum parts etc, special casting mold include: lost foam casting, sand mould casting, investment casting, metal mold casting, ceramic mold casting, etc. common mold material is the original sand, clay, sodium silicate, resin and other auxiliary materials. the original sand include: magnesia olivine sand, disthene sand and graphite sand, quartz sand, magnesia and zircon sand and chromite sand, iron ore, etc.
In Europe before and after the eighth century began the production of iron castings. The emergence of cast iron parts, expand the application range of castings. In the 15 ~ 17 century, for example, Germany, France and other countries has been equipped with a lot of to residents cast iron parts(pipes) for drinking water. Afterthe industrial revolution of 18th century, industries of the steam engine, the loom and railway were on the upgrade ,casting into the new period for serving the great industry ,the technology of casting had great. Development.
ZHY processes a research team led by domestic senior engineers who have been in this industry for many years, has been committed to the research and development on new products.
Senior engineer, Zhang ruifen, graduated from HenanUniversity of Science and Technology in 1982. She worked in foundry Institute of China YTO Group. And Zhang has been in foundry industry for over forty years.
Senior engineer , Li Shuhui, as well as Zhang, worked in foundry Institute of China YTO Group. Engineer is also a professional in foundry industry for over forty years.
Senior engineer, Zhou huayue, graduated from Tsinghua university in 1988, was the director or Luoyang Wanshun High-Tech Application Research Institute of China YTO Group and the manager of Industry Institute of Dongfang Industry Company of China YTO Group.