Screw manufacturing process consists of several steps by the detail in each step, there will be differences according to the type of product. Qualitative terms, subdivided according to this.1. the process of cleansing and lubricating coatingTo prevent rust on the surface of steel and other materials, contamination on the surface of the metal insert process for the production of bolts, screws, need to be cleanse. Usually there are 2 methods; -Traction to get rid of the rust, the so-called "Mechanical Descaling". -Cleaning the skin with acid is the acid hydrochloride (HCL) is called "Chemical Descaling" and the Phosphate coating, Hot lime for use as a lubricant in pulling the size reduction.2. pull the steel wire size reduction process.The normal pull shrink in low carbon steel during the 0.06 – 0.22 will have a 20 percent reduction in size and carbon steel between 0.25-0.50, there will be a reduction of 15 percent per year by pulling the wire through mold resembles a tilted angle, to reduce the size.3. the process of thermal (Heat Treatment).Such a process would be done in case of steel wire and steel wire. Can be divided into groups according to this.• Annealing (Annealing): a baking at a higher temperature than the temperature of the steel structure is approximately 900 oc nanai or Australia is with low carbon steel to reduce internal stress and increase in processing qualification.Spheroidized Annealing: baking • a temperature lower than the 723 oc takes approximately 11 hours of baking, so sea domain to the tight round steel with medium to high carbon to add properties in processing.• Patenting is baking at a higher temperature than: temperature at which steel structure as Australia nanai. Approximately 900 oc and then cooling rapidly and maintain the temperature of approximately 540 oc in a salt bath in order to get a lead structure is completely pearlitic is used with medium to high carbon steel for added in processing qualification.4. the process of smashing the head (Cold Heading).As the cold processing by using the in-mold, forging the iron bolts, screws, according to the head of material used in making Tungsten Carbide is the Group mold.5. the process of threading (Threading)Order processing, has a threaded end of the pass, then smashed by the raw material in the production of High Speed Steel Group is the mold.6. the heat treatment process.In order to improve the mechanical properties, in particular hardness of the product can be divided into two groups.• The Case Hardening: hardness that feature is how to add skin treatments with low carbon steel bolts, screws, a group at a temperature above the temperature of the steel structure is approximately 900 oc nanai or Australia in a friendly atmosphere with high carbon to make carbon diffuses into the surface (usually LPG gas to create the atmosphere of high-carbon) from the hardening by cold temperatures, oil samples 90 oc and bake themselves do. (Tempering) at a temperature of 250-400 oc, then let cool in air products will have a high surface hardness of approx. 400 HV.• Features: the Quenching hardness of the product by using the screw nut with moderate to high carbon steel group. The baking temperatures over approx. 900 oc AC3 or, and then let cool on the baking temperature 90 oc and oil to make themselves. (Tempering) at a temperature of 250-400 oc, then let cool in air, the product will have a high surface hardness, and will have a higher strength properties.7. coating, corrosion resistant properties (Corrosion Resistance).Plating with methods and substances include zinc plating with hot-dip method (Hot-dipped galvanized) coatings (Electroplating) and electric plating with a special color.
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