Flat welding flange

rough bore preformed gap exists, to send students decarburization or oxidation, therefore, should strictly control the exposure time. According to the exposure time for forging welded flange performance impact, and identify forging preform in the air before the transfer time. General For alloy welded flange, special or high-alloy steel flat welding flange preform, heat exposure time should not exceed five minutes. To reduce oxidation and decarburization tendency can also be sprayed on the preform glass, colloidal graphite lubricant or lubricant. Forged Flanges are generally closed die forging, forging sometimes there are burrs, so the high precision molds. Preform dimensional accuracy and weight must be strictly controlled in order to ensure Hydraulic ferrulesof flat welding flange forgings. Mold design should ensure that the module easy to replace worn. Under normal circumstances forging die life should be at least 5000-15000 pieces. Forging, the mold lubrication and preheating are two important factors. Sufficiently good lubrication, mold preheating temperatures are conducive to improve forging forgings overcome flat welding surface layer formation density, to ensure the quality of forgings, to improve die life, reduce the deformation resistance, which will help fill the mold cavity preform. Mold temperature begins to be preheated to 200-300 degrees, but too high will reduce the life of the die mold temperature, continuous forging production, the mold temperature should be controlled automatically. For example, by spraying lubricant or spray cold air to reduce the mold temperature. Generally flat welding flange forging lubricants are generally choose water-based suspensions or colloidal graphite graphite suspension in the mold and the preform surface coating. There are also water-soluble glass lubricant coating the mold surface or the surface of the preform. Flat welding flange forging process equipment requirements, strict than traditional forging punch displacement characteristics must preform with dense match the characteristics of the deformation. Billet and the mold contact time as short as possible. Forging machines have good rigidity, activities beams and pistons have a good guiding precision forgings to ensure accuracy. Therefore, the flat welding flange forging usually selected mechanical presses, such as the crankshaft presses, or high precision friction press.