Spinning is to fix the flat plate or hollow blank on the mold of the spinning machine. While the blank rotates with the spindle of the machine, a rotating wheel or rod is used to pressurize the blank to cause local plastic deformation. Under the combined action of the feed motion of the rotating wheel and the rotational motion of the blank, the local plastic deformation gradually extends to the entire surface of the blank and is closely attached to the mold to complete the spinning process(as stainless steel spinning) of the part.
Spinning is a special forming method. The spinning method can be used to complete the drawing, flanging, shrinking, bulging and curling processes of rotating bodies of various shapes.
Spinning equipment
According to the principle of deformation
Ordinary spinning machine Powerful spinning machine
According to the spindle position
Horizontal spinning machine: A horizontal spinning machine with a horizontal spindle is called a horizontal spinning machine.
Vertical spinning machine: The spindle is vertically oriented. It is called vertical spinning machine.
According to the number of wheels
Single-wheel spinning machine: A spinning machine with only one wheel is called a single-wheel spinning machine.
Double-wheel spinning machine: A spinning machine with two wheels is called a double-wheel spinning machine.
Three-wheel spinning machine: Those with three wheels are called three-wheel spinning machines. Multi-wheel spinning machines: Those with three or more wheels are called multi-wheel spinning machines.
Relative position of core mold
External spinning machine: A spinning machine in which the rotating wheel spins the workpiece from the outside.
Internal spinning machine: a spinning wheel that spins the workpiece from the inside
According to the direction of metal flow
Forward spinning: spinning in which the direction of metal flow is the same as the direction of movement of the wheel
Anti-spin: The direction of metal flow is opposite to the direction of wheel movement.
Forward and reverse spinning: The metal flows in two directions during the spinning process.
According to the spinning temperature
Hot spinning machine: A spinning machine that can heat and spin the workpiece?
Cold spinning machine: spinning at room temperature
spinning process
The slab and the mandrel rotate together, and the rollers feed and apply pressure to make the slab close to the mandrel and deform locally point by point. (See the figure [Spinning Principle]). Spinning can be used to manufacture various axially symmetric rotating body parts, such as speakers, projectiles, high-pressure vessel heads, and gongs; it can also be used for gas bottle closing, tube blank forming, etc. The characteristics of spinning are: large workpieces can be formed with very small deformation force; the equipment is relatively simple to use, and small and medium-sized thin plates can be spun on ordinary lathes; the mold is simple, only a mandrel is needed, and the material requirements are low. Spinning is suitable for small batch cnc machining, because it can only process rotating parts, which has great limitations and low productivity. Special machinery can be used for spinning, using profiling spinning and digitally controlled spinning. The process of thinning the plate thickness while spinning is called thinning spinning, also known as powerful spinning. It is mostly used to process tapered parts, thin-walled tubular parts, etc. It can also be used to spin large-diameter deep parts. cylinder, and then cut into flat plates.
Advantages and disadvantages of spinning
The advantage of spinning processing is that the equipment and molds are relatively simple (when there is no dedicated spinning machine, a lathe can be used instead). In addition to being able to form rotating bodies such as cylindrical, conical, parabolic or other various curves, it can also be used to form rotating bodies. Processing of rotating parts with quite complex shapes. The disadvantages are low productivity and high labor intensity, so it is more suitable for trial production and small batch production.
With the production needs of aircraft, rockets and missiles, thinning spinning (also called powerful spinning) has been developed on the basis of ordinary spinning.
Rotary forging
Rotary forging is a processing technology using a rotary forging press. The rotary forging press is a forging machine that combines forging and rolling. On a rotary forging press, the deformation process is completed by the gradual expansion of local deformation, so the deformation resistance is small, the machine mass is small, the work is stable, and there is no vibration, and it is easy to realize automated production. Roll forging machines, forming rolling machines, plate rolling machines, multi-roller straightening machines, rolling machines, spinning machines, etc. are all rotary forging machines.
Principle of rotary forging
The deformation process of processing a loose and porous sintered molybdenum rod (blank) into a dense metal with a certain strength. Rotary forging is a periodic reciprocation of two hammer dies in the chute while rotating at high speed around the longitudinal axis. Movement, high-speed and high-frequency forging of forging blanks
. Rotary forging has the characteristics of multi-directional forging and pulse forging in terms of technology. The forging is subject to three-dimensional compressive stress, which is more suitable for billet processing of molybdenum, a metal with low plasticity and high strength. The three rolls on each stand of the Y-shaped rolling mill are axially aligned at 120 degrees from each other. Angle. The hole pattern consists of 3 holes that are 120 degrees each other. It is surrounded by angled roll surfaces. During the rolling process, the rolls compress the rolled piece from three symmetrical directions, and the next roll flips 180 degrees. , compressing and deforming the rolled piece from the other three directions. During the entire multi-stand three-roll rolling process, the hydrostatic pressure on the rolled piece is relatively large, which is extremely beneficial to improving metal plasticity. The Y-shaped three-high rolling mill divides the pass into arc triangular pass and flat triangular pass according to the shape of the roll surface. The arc triangular pass is especially suitable for billet rolling of tungsten and molybdenum materials.
Rotary forging applications
The automotive industry’s ongoing search for fuel savings has led to the use of cold rotary forming technology, which significantly reduces the weight of components. The first phase of improvements, a 50% weight reduction, involved replacing the solid cup with tubular parts, without any loss in the technical characteristics of the component. A particularly attractive result of this process is the machining of hollow gear shafts, where complex changes in wall thickness can be well controlled, which is generally not possible with other processes.If you want to find a cost-effective and rapid CNC metal spinning solution for your manufacturing needs, Be-cu.com can be a good choice for you. Based on extensive experiences and professional expertise, our CNC metal spinning services are available for both prototypes and low to high volume production runs. Working with Be-cu, the most advanced fabrication machinery allows us to fabricate end-use metal spinning parts and products in high efficiency while maintaining premium quality, which saves money and time for our clients significantly.
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