Flat welding flange

To obtain a dense, high-performance flat welding flange forgings, forging temperature must be properly selected, the speed, the deformation force and other parameters. Initial deformation welding flange forging, since the porous preform deformation, the deformation force is small, the density increases rapidly. Forging late, because most of the pore is closed, deformation resistance increases, the need to eliminate the residual porosity increased rapidly deforming forces. Deformation resistance is closely related to the deformation temperature, the higher temperatures favor dense distortion and reduce the deformation resistance. Higher strain Hydraulic pipe fittings  welded flange dense. To this end, various factors must be taken into account impact on forging quality, selection of process parameters. For low alloy steel, usually forged 1125 degrees. But in the interval 850-900 ° also has a low flow stress. Flat welding flange forging cold forging can avoid high temperatures during grain coarsening, eliminating the need for normalizing treatment after forging. Help save energy, improve die life, but also can improve the performance of welded flange, heating before forging preform blank, you need to protect the atmosphere pressure. In order to prevent oxidation and decarburization, usually in an inert gas or hydrogen gas within the furnace Hydraulic hose fittings . In the flat welding flange forging production line under a protective atmosphere generally use high-frequency induction heating. Heating time, according to the degree of alloying material, the oxygen content and the size of the preform determined. Heat through heating time should prevail, namely flat welding flange rough materials inside and outside temperature uniformity. When you reach forging temperature and heating time, it should immediately be forged. Good heating before forging preform blanks in, always put in the air for some time, because of 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 the accuracy of flat welding flange