Introduction of aluminum alloy production
The main process is:
(1) Ingredients: According to the specific winning prizes required to be produced, the amount of each alloy component added is calculated and properly matched with various raw materials.
(2) Smelting: The prepared raw materials are added into the smelting furnace according to the process requirements to be melted, and the impurities and gases in the melt are effectively removed through degassing and deslagging refining means.
(3) Casting: The smelted aluminum liquid is cooled and cast into a variety of round cast rods under a certain casting process condition through a deep well casting system.
2. Extrusion: Extrusion is a means of forming a profile. First, molds were designed and manufactured according to the profiles of the profile products, and the heated round cast rods were extruded from the mold using an extruder. Commonly used grade 6063 alloy, when used in the extrusion also uses an air-cooled quenching process and artificial aging process to complete the heat treatment. Different brands of heat treatable alloys have different heat treatment regimes.
3. Oxidation: Extrusion of aluminum alloy profiles, the corrosion resistance of the surface is not strong, must be surface treatment by anodizing to increase the aluminum corrosion resistance, wear resistance and appearance of the appearance.
Its main process is:
(1) Surface pretreatment: The surface of the profile is chemically or physically cleaned to expose a pure matrix to facilitate obtaining a complete, dense artificial oxide film. It is also possible to obtain a specular or matt (matte) surface by mechanical means.
(2) Anodizing: After surface pretreatment of the profiles, anodization occurs on the surface of the substrate under certain process conditions to form a dense, porous, strong AL203 film layer.
(3) Sealing: The pores of the pores of the porous oxide film formed after the anodization are closed, so that the oxide film is prevented from contamination, corrosion and abrasion resistance. The oxide film is colorless and transparent. By using the strong adsorption of the oxide film before sealing, some metal salts can be adsorbed and deposited in the film pores, which can make the appearance of the material besides the colors (silver white), such as: black, bronze, Gold and stainless steel and so on.
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Otis is the world's largest manufacturer and maintainer of people-moving products, including elevators, escalators and moving walkways. Founded more than 160 years ago by the inventor of the safety elevator, Otis offers products and services through its companies in more than 200 countries and territories, and maintains approximately 1.9 million elevators and escalators worldwide. Otis is a unit of United Technologies Corp., a leading provider to the aerospace and building systems industries worldwide
| People | Nearly 66,000 employees globally with approximately 1,000 branch offices |
| Revenue | $12 billion in 2015 |
| Installed Base |
Approximately 2.6 million Otis® elevators and escalators in operation worldwide |
| Service Base | Approximately 1.9 million elevators and escalators serviced by Otis worldwide |
| Countries | Products sold and serviced in more than 200 countries and territories |
| Manufacturing | Major manufacturing facilities on four continents |
| Engineering and Test Centers |
Otis has a network of research and engineering facilities and test towers around the world Company's two tallest elevator test towers are located in Shibayama, Japan (505 feet or 154 meters above ground; 89 feet or 27 meters below ground) and Bristol, Conn., United States (384 feet or 117 meters above ground) |
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