GFM rotary former
The workpiece is stationary, while the hammers rotate. Construction resembles a roller bearing. The anvils are free to move rapidly in a slot of the rotating shaft, and are thus hurled against the rollers which, in turn, knocks them back.
- The GFM rotary forging machine consists of four rotatable adjustable housings in which eccentric shafts drive the forging hammers at speeds up to 210 strokes min-1.
- Two manipulators, one on either side of the machine, are used to hold the workpiece.
- The four-hammer system contains the workpiece on all sides, which eliminates the tensile stresses developed in conventional hot forging.
- The high rate of working leads to heat generation to compensate for radiation losses, so that multiple passes can be used to produce a forging in a single heat. This leads to substantial energy and labour savings compared with conventional forging.
- Can rotary forge or swage most forgeable materials.
- Some “difficult-to-forge” materials by conventional techniques can be rotary forged or swaged because of the prevention of tensile forces that would normally cause tensile cracking on upset surfaces.
- The GFM rotary forging technique gives greater precision than conventional hot forging techniques, which in turn reduces machining allowances and costs.
- Rotary swaging can produce exceptionally smooth surfaces to close tolerance.
- Tube can be drawn-out lengthwise, and the use of a mandrel can be employed to form internal contours inside the tube.
This article is a part of Manupedia, a collection of information about some of the processes used to convert materials into useful objects.