What is spin forming technology?
Spinning is a combination of forging, extrusion, stretching, bending, ring rolling, cross rolling and rolling and other technological characteristics of less, no cutting of advanced processing technology, widely used in the processing and forming of rotating parts.Is based on the characteristics of material of plastic, the blank card on the mandrel and spin, choose reasonable spinning process parameters, spinning tools (wheel or other special-shaped pieces) as opposed to a mandrel continuous feed, in order to tiny parts of deformation pressure, workpiece blank compression and generate continuous point deformation artifacts and gradually forming a kind of advanced plastic processing methods.
The characteristics of spinning forming process: in short, less cost, low power consumption, made of product strength, used people say good!
●1) In the spinning process, the roller pressure on the blank point by point, the contact area is small, the unit pressure can reach 250 ~ 350 kg force/mm 2 or more, for processing high strength and difficult to deform materials, the total deformation force is small, so that the power consumption is greatly reduced.
●2) Under the action of the three-way deformation force, the metal grains of the billet mismove along the slip plane of the deformation zone. The direction of each slip layer on the slip plane is consistent with the direction of the deformation. Therefore, the metal fiber remains continuous and complete.The strength, hardness, tensile strength and yield limit of the spinning products are improved due to the strain of the metal lattice structure.
●3) Powerful spinning can make products to achieve higher dimensional accuracy and surface finish.In the spinning process, the spinning wheel not only has the effect of calendering the spinning metal, but also has the effect of leveling, so the surface finish of the products is high.
●4) Spinning can be spun under the normal temperature and heating conditions of the metal.
●5) a wide range of products.According to the ability of the spinning machine can produce large diameter thin-walled pipe, special pipe, variable section pipe and spherical, hemispherical, elliptical, curved line and with steps and varying wall thickness of almost all rotary system parts, such as rockets, missiles and satellite nose cones and shells;Submarines penetrate seal rings and torpedo housings;Radar mirror and searchlight housing;Jet engine fairing and prime mover parts;Hydraulic cylinder, compressor housing and cylinder;Turbine shafts, nozzles, television cones, combustion chamber cones and bellows;Rotary drum of dryer, mixer and washing machine;Heads, wheels and cylinders;As well as the super width of about 7 meters, about 9 meters long plate (the large diameter of the spinning pipe is cut open and pressed flat).
●7) The blank has a wide source, which can be made of hollow stamping parts, extruded parts, castings, welding parts, machinated forgings and rolled parts as well as circular plates. It can spin non-ferrous metals, ferrous metals and alloy metals containing titanium, molybdenum, tungsten, tantalum and niobium which are difficult to deformation.In addition, spinning is often combined with stretching, coiling and other pre-forming processes to produce more complex parts.
●8) In the spinning process, due to the approximately point-by-point deformation of the spinning billet, any slag inclusion, interlayer, crack, sand hole and other defects are easily exposed.This spinning process has also played a role in the automatic inspection of products.However, at the same time, this feature can also effectively improve the defects such as cracks and trachoma in the material. For example, in the spinning of the rim of the cast aluminum wheel hub, the removal rate of the trachoma after spinning is close to 100%.
●9) The main difference between spinning and drawing and stamping is that the drawing and stamping is made from the line into the surface process gradually, so the forming force is relatively large, spinning is from the point to the line, and then from the line to the surface forming process, so the shape can be made into relatively complex parts through spinning.Therefore, compared with sheet stamping, metal spinning can greatly simplify the equipment used in the process. Some parts that need to be pressed many times can be manufactured by spinning once.Reduce the cost of mold manufacturing.
What is the difference between normal spinning and strong spinning?In a word, the general spin focuses on concave shape, and the strong spin focuses on pressing thin and pressing long
Ordinary spinning is a spinning process in which the shape of billet is changed and the wall thickness is basically unchanged or less changed.The general spinning is mainly formed by changing the diameter of the sheet material to form the workpiece, which is a no-cutting forming process for processing the thin-walled rotating body. The rotating metal circular plate or pre-formed billet is formed by feeding motion through the spinning wheel.
Power spinning (also known as thinning spinning) is derived from ordinary spinning. During spinning, not only the shape of the blank is changed but also the wall thickness is significantly changed (thinned).The difference between thinning spinning and ordinary spinning is that thinning spinning belongs to the category of volume deformation. In the process of deformation, the wall thickness is thinned and the blank volume is basically unchanged. The shape of the finished product is completely determined by the size of the core die, and the size accuracy of the finished product depends on the reasonable matching of process parameters.When the cylindrical parts are powerfully spinning, only the outside diameter is reduced but the inside diameter is not changed (the opposite is true when the inside is spinning).As the strength spinning reduces the wall thickness of the blank, a large amount of deformation is allowed in one spinning, which makes the production efficiency of the strength spinning much higher than that of the ordinary spinning, and its application scope is greatly expanded, but the corresponding strength spinning needs a large amount of equipment power.
Finally, to tell the truth, there are many enterprises that can do ordinary spinning in China at this stage, and there are three enterprises that can do good spinning. The domestic part is just developing. If you are interested in spinning or have questions, you can also contact us
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