Other castings technology
Known as lost wax casting, the process of investment casting is one of the oldest manufacturing processes. Egyptian pharaoh to use the time to make gold jewelry (hence the name Investment) some 5,000 years ago. Complex shapes, can be high precision. In addition, the metal is difficult to machine or fabricate are good candidates for this process. It can be used to make can not be through normal production techniques, such as turbine blades with complex shapes, or aircraft components to high temperature, the production of spare parts.
The materials used in the mud of Paris, a binder and powder of quartz, a low-temperature refractory materials, melting the mixture of plaster. For higher temperature melts, sillimanite as a refractory aluminum silicate and silica gel as an adhesive. According to the plan after the completion of fineness and the ideal sillimanite TEOS additional coating can be applied. Therefore, the production can be used for light castings, or placed in a larger container, and enhance it more directly mud reinforced mold.
0.5% of the length tolerance is usually possible, as low as 0.15%, the small size possible. Casting weight from a few grams to 35 kg (0.1 to 80 ounces), but the normal size range from 200 grams of about 8 kg (7-15 ounces). The minimum wall thickness is about the normal 1 to 0.5 mm, you can easily alloy casting (0.040-0.020 inches).
On down, mold preheat to about 1000 ℃ (1832 ℉) to remove any wax residue, hardened adhesive. Into the preheated mold also ensures that the mold will be completed. Casting can be done using gravity, pressure or vacuum conditions. Should be noted that the use of pressure to penetrate into the mold, so that the air to escape towards the completion of.
Any type of material can be die cast aluminum, bronze, tool steel, stainless steel, tungsten chromium-cobalt alloy, Hastelloys, and precious metals. Components and investment castings often do not need any further processing, because it can be achieved tolerance.
Mold is caused by a model using wax or other material that can be gradually disappear. This pattern wax dip in the refractory mortar, while the coat of the wax model of the formation of the skin. This is not dry, soaking in the slurry process, is a strong thickness, until the realization of repeated dry. After that, the entire pattern is placed in the oven and the wax was melted. This has resulted in filling molds with molten metal. As the mold is built around a single model, the formation of the (this does not have to be pulled, mold from the traditional sand casting process), very complex parts and can be weakened. Wax pattern itself is by the use of stereo lithography or similar model, has been the use of computer manufacturing entity model for replication.
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Die Casting is a very wide industry product, almost all the metal products can be included in die casting. There are many kinds for materials that can do die castings, for example, aluminum, zinc,carbon steel, alloy steel, stainless steel , grey iron, ductile iron, brass as well as bronze. Meanwhile, we are also able to supply a series of finishing process for the rough casting and metal parts, such as fine machining, polishing, heat treating, powder coating, plating, anodizing ,painting etc. Moreover, thanks to our many qualified suppliers for the rubber, plastic injectiong molding,spring, punching,stamping prouducts, that enable us to provide our customers the complete set projects while assembling the correlative products if customers request.
There are machines for die casting from 250kN to 1000kN. Aluminum die casting from several grams to kilograms. Supply finish machining process when customer require.
Die Casting is a very versatile casting process, it is considered a relatively expensive process to see. But compared to other programs, the need for extensive investment in the welding or processing components can be significantly reduced are often expressed in the party’s overall production costs. Of course, not every metal part casting requirement appropriate process. However, the difficult part for many applications, investment casting offers an effective and cost-effective solution for forging.
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Die-casting production process is capable of producing a geometric reusable mold by use of complex metal parts, known as dies. Precision die casting process involves the use of a furnace, metal, die-casting machines and molds. Metal, usually a non-such as aluminum, zinc alloy, is melted in the furnace, and then in the die-casting machine mold injection. There are two die-casting machine die-casting – the main types of hot-chamber machines (used for low melting temperature, such as zinc, alloys) and cold chamber machines (used for melting temperatures are high, such as aluminum and alloys). The difference between these machines will be set out in the equipment and tools section. However, in the two machines, molten metal injected into the post-death, it is quickly cooled and solidified the last part, called casting. The steps in this process described in more detail in the next section.
Investment is created in this process, and can vary greatly in size and weight, from a couple castings ranging from ounces to 100 pounds. One die-casting of general application, Block – thin-walled shell, often require a lot of ribs and internal boss. For a variety of appliances and equipment, metal shell, often casting. Several auto parts also used die-casting manufacturing, including the pistons, cylinder heads, engine blocks. Other common die-casting parts, including the propeller, gears, bushings, pumps and valves.