Now there horizontal parting flaskless molding machine 人氣: 39 回覆: 0
The process entails forcing molten metal under high pressure into steel molds or dies that are reusable. These moulding machine can be designed to produce complex shapes with a remarkable accuracy as well as repeatability. The v-process casting method was first developed in Japan
This process is favored by many industries today because of some its advantages over plastic molding. It can be said that it produces sturdy and more durable parts with closer tolerances. Furthermore, die cast parts have greater resistance to extreme temperature and possess superior electrical properties. The foundry business has been under siege for the last 10 years, maybe more. In fact, here in Philadelphia, during the 60's there were at least 30 major foundries. Now there horizontal parting flaskless molding machine is only one major producer. But the casting process is growing on a global basis. It is the backbone of manufacturing the majority of our metal products. Let's take a look at the advantages and disadvantages of 5 casting processes.
1) Sand Casting
Sand casting is one of the oldest processes. As the name implies. a fine form of sand is used as the
mold. Metal is poured(gravity feed) into the mold. After the material has cooled, the frame is released and the sand falls away. Leaving the parts to be ground and cleaned.
This type of casting is the most rudimentary of all. But it has a tremendous advantage. This is the least expensive and maybe the only way to make large castings. Castings that weigh 50 lbs., up to thousand of pounds are made using this method.
2) Investment Casting
Compared to sand casting, this process yields a more precise, complex component. IC process has been used for hundreds of years to make jewelry.
To make an investment casting, a tool is machined out of aluminum. Then wax is injected into the tool. The tool then produces a wax model that is an exact replica(with some allowances for shrinkage) of the part to be made.
The wax is then assembled with other waxes on a tree. Depending on the size of the part, each tree becomes 10 - 200 pieces. After the tree is totally assembled, heat treatment furnace is dipped in 5 coats of ceramic slurry.
After the ceramic hardens, the wax is melted out of the tree. Dies are made of hot work tool steel which was melted, remelted under vacuum, forged, cut into size, machined to the required shape and finally heat treated. Even with the best efforts put in to increase the steel hardness, strength, toughness, ductility and thermal conductivity die tools can start wearing off after 10,000- 20,000 castings made. Imaging now how much money to be saved by finding a way of increasing the die life to hundred thousand or more castings.