Globoidal cams
Globoidal cams are found in indexing gear boxes. These high-precision, purely mechanical components are the heart, or you might say the “brain”, of this type of gear unit.
They are capable of “storing” the cycle frequency, movement, acceleration ramp and position dwell time. Indexing gear boxes are used not only for filling, portioning and packaging, but can also carry out highly precise assembly work. You would think that nowadays reduction gear units controlled by servomotors would be the first choice. However, this is not the case, as indexing gear boxes have their own advantages. By mechanically coupling multiple of these units together, even of different types, it is possible to implement a very complex process with only one drive motor, all with perfect coordination. They largely do away with the need for expensive electronic control components that are likely to be damaged.
Obviously the cams must engage in the
globoidal cams with no play. Since multiple
cams are generally engaged at the
same time, even the slightest deviation in
the curves will cause the gear unit to jam.
The globoidal cams are initially milled
with an allowance. After the hardening
process, they are ready for the grinding
process. Traditionally an eccentric grinding
device is used for this. If the aim is to
achieve good surface quality, then this old
process is very slow and also inflexible.
Manual reworking is generally required.
SCHNEEBERGER follows a different,
flexible approach for this. It is based
upon the machine data from the milling
process. From this information, our
grinding software QUINTO calculates
both flanks of the cam separately. The
two grinding paths can therefore be modified
individually, e.g. in order to optimise
the beginning of the curve. A dressing
unit and a wheel probe are meaningful
options when it comes to process optimisation.
Depending on the size of the workpieces
and the diameter of the cams, several
SCHNEEBERGER machine types can
be equipped for this application. normaNGC,
geminiNGM and corvusGDS are
already in service with manufacturers of
indexing gear boxes.
Categories
All posts
- Visit SCHNEEBERGER at GrindingHub and see 5-axis CNC Grinding Technology at its best
- Live from CCMT Shanghai: Skiving Cutter Profiling, Shank Tool Grinding and more…
- Economical Regrinding of Large Tools with the Aries NGP+ from SCHNEEBERGER
- Reliable Manufacturing of Wire-Bonding Tools
- A 30-year successful partnership between FANUC and SCHNEEBERGER, brought to the point via video