It is a flat blank or pre-formed blank fixed to the rotating gas meter hose

Hot extrusion technology is a metal in the recrystallization temperature or higher, extrusion, so that the tube extruded from a die orifice to obtain a cross-sectional shape of the die hole of the metal pipe molding method. Before extrusion billet machined need pretreatment, when squeezing the tube diameter of 100mm or less, equipment investment is small, less material waste, the technology is more mature. These methods are high efficiency, low consumption of metal, good product quality, advanced control system, used widely. The method of expanding hot push the system

Push system expanding device is simple, low cost, easy maintenance, economical, durable, flexible product specifications change, such as the need to prepare large-caliber elbow and other similar products, you only need to add some accessories to. This not only can solve difficult deformable steel pipe molding problems, but also avoids the blank pipe inside and outside surface defects caused by the tensile stress.

Mold tool is simple, easy to replace, the production cost is lower than other methods. The disadvantage is that low productivity, greater labor intensity, more suitable for prototype and small batch production. So perforation process plays an important role in modern steel production. However, once the pipe diameter method increases, hot extrusion requires large tonnage and high-power devices, the corresponding control system must be upgraded. So hot extrusion method is particularly suitable for a variety of alloy steel, stainless steel, high-strength steel, nickel-based superalloy, such as profiles, molded pipe.

The main disadvantage is the production of long working hours, low output, the processing of the tube by the device length limit, short size. The entire production process generally include perforation, rolling and fixed reducing processes. Throughout the hot extrusion process (from tube to tube shortage), the tube is in a three-state deformation of compressive stress. In the feed movement and rotational movement of the rotary joint action of the blank, so that local plastic deformation gradually extended to the entire surface of the blank, and close to the mold, complete spinning parts. Advantages of the spinning process is relatively simple equipment and tooling (not available dedicated lathe instead when spinning machine), in addition to forming such as cylindrical, conical, parabolic or rotate in vitro formation of various other curved lines, but also fairly complex shape machining rotating body parts. As the first step of perforated metal deformation, piercing the pipe wall thickness is thicker, shorter length, the inner and outer surfaces of poor quality, so called capillary.

Vertical extension of the rolling mill is mainly limited MPM rolling chassis metal flex hose less MPM tube rolling, three-roll MPM pipe rolling and floating mandrel mill rolling. Suitable for the production of thin-walled seamless steel pipe diameter Heavy material, also can produce no more than the capacity of the thick-walled tube equipment. It is a flat blank or pre-formed blank fixed to the rotating gas meter hose mandrel wheel spin to put pressure on the blank, spin the wheel at the same time as the axial feed, after one or more processing to obtain a variety of thin-walled hollow rotary system Commodities process method.