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Casting Improves Performance
Jun 19, 2017

Casting improves performance
Casting forming process is the use of special elbow push machine, core mold and heating device, in order to achieve in the mold on the billet pushed forward in the push machine, in the movement of heating, expansion and bending process The The deformation of the casting is characterized by the fact that the diameter of the tube is determined according to the law of the volume before and after the plastic deformation of the metal material. The diameter of the tube is smaller than the diameter of the elbow, and the deformation process of the blank is controlled by the mandrel, Metal flow, added to the expansion due to the expansion of the other parts, resulting in uniform wall thickness of the casting.
Casting forming process has a beautiful appearance, uniform wall thickness and continuous operation, suitable for high-volume production of the product characteristics, thus becoming a carbon steel, alloy steel elbow of the main production methods, and also used in some specifications of the stainless steel elbow manufacturing in. The heating method of the forming process is medium frequency or high frequency induction heating (heating ring can be multi-turn or single lap), flame heating and reverberatory furnace heating, what kind of heating method used to shape the product requirements and energy decisions.
Casting rigidity is poor, suitable for the pressure p ≤ 4MPa of the occasion; GB castings larger rigidity, suitable for high pressure temperature occasions. Casting forming technology The basic process is: first welding a cross-section of the polygonal polygonal ring shell or closed ends of the polygonal fan-shaped shell, the internal pressure medium pressure, the pressure applied under the pressure in the cross-section by the polygon Gradually become a circle, and eventually become a circular ring shell. There are three types of flange sealing surface: flat type sealing surface, suitable for pressure is not high, the media non-toxic occasions; convex sealing surface, for a little higher pressure occasions.
Casting technology for manufacturing work pressure less than 10MPa, casting diameter d? 125mm, casting diameter D and casting diameter d ratio d / d? 1.5 of any casting, and the size of the diameter of the casting is not restricted. For example, can be processed casting diameter of 12m, casting diameter of 60m or more large GB castings. GB of petroleum, natural gas, chemical, hydropower, construction and boilers and other industries pipeline system. Tongue and groove sealing surface, suitable for flammable, explosive, toxic media and high pressure occasions. A gasket is a ring made of a material that produces plastic deformation and has a certain strength.
 Casting (HG20600, GB / T9121, JB / T83) is relatively simple, mainly for corrosive media with the pipeline system; elbow flat welding ring can use different materials, reduce elbow costs and improve performance. Elbow sealing surface with auricle, convex surface, tongue and groove surface.
So that the pipe and pipe connected to each other parts, connected to the tube end. There are holes in the elbow, the bolts make the elbows tight. The elbow is sealed with a gasket. Flanged pipe fittings (flanged pipe fittings) refers to the elbow (flange or plate) of the pipe. It can be cast from (tentative), but also by the thread connection or welding composition. Elbow joint (flange, joint) by a pair of elbow, a gasket and a number of bolts and nuts. Gasket on the elbow between the sealing surface, tighten the nut, the gasket on the surface of the specific pressure to a certain value after the deformation, and fill the sealing surface on the uneven, so that the connection tightly leak. Elbow connection is a detachable connection.