PROCESSES

Internal forming thick-walled

The GROB internal cold forming process is based on a straightforward and universally applicable principle: the total forming effort needed is broken down into numerous of axial and radial forming increments.

beNEFITS

- Splines up to flange
- Economical tooling costs
- Superior spline and gear quality
- Surface work hardening
- Surface finish Ra 0. 4 ~ N5
- No disruption of material grain flow

PROCESSES

SPINNING SHEET METAL
COLD FORMING SPLINES
INTERMITTENT FORMING SPLINES

INTERNAL FORMING & JOINING
SLOTTING, COINING, FORMING SHEET METAL

MACHINES
A-SERIES COLD FORMING MACHINES

C-SERIES COLD FORMING MACHINES

R3 SPINNING MACHINE
i9 INTERNAL FORMING MACHINE

T12 COLD FORMING MACHINE

S8 SLOTTING MACHINE

ERNST GROB AG
Rohrgasse 9
P.O. Box 830
CH-8708 Männedorf
Switzerland

T +41 44 922 77 00
F +41 44 922 77 88
info@ernst-grob.com
sales@ernst-grob.com

SITEMAP
IMPRINT
DATA PROTECTION

The total splined length is normally generated by the axial infeed of the workpiece. In certain cases, however, the entire spline length can be produced by vertical infeed towards the centerline.
Depending on the application, up to four different tools can be used.
This enables the production of geometries that cannot be otherwise generated.

In contrast to other GROB spline forming processes, the tools (punches) do not rotate in a planetary motion around the roller spindle, but „stamp" the splines at a 90 degree angle to the workpiece.

As practically no spline fillet is generated, splining can be run very close to shoulders or steps.

APPLICATIONS

POWERTRAIN - Solid stock

Mit dem GROB- Kaltwalzverfahren hergestellte Steck- und Laufverzahnungen sowie Torsionsfedern, werden dank dem wirtschaftlichen Verfahren und den prozessbedingten Vorteilen sehr oft in Bauteilen des Antriebsstrangs von Personenwagen, Nutzfahrzeugen oder landwirtschaftlichen Fahrzeugen eingesetzt.

Anwendungsbeispiele

Getriebewellen
Steckachsen
Gelenkwellen
Antriebswellen
Gabelwellen
Abgangswellen
Flanschwellen
Getriebeschaltwellen
Kupplungswellen
Novikov-Getriebe
Radwellen
Halbwellen
Abtriebswellen
...
...

ENGINE TECHNOLOGY - solid stock

The extremely high manufacturing accuracy achieved on GROB cold forming machines makes them eminently suitable for precision spline and gear generation on key engine components such as camshafts for valve lift adjustment.

Typical applications

Crankshafts
Camshafts
Starter pinions
...
...

INDUSTRY - solid stock

In addition to superior cost-effectiveness, the technological benefits of cold forming are crucial to the success of numerous industrial applications. Prominent among these are, for example, high accuracy levels, surface work-hardening, low distortion after post-forming heat treatment etc.

Typical applications

Extruder shafts
Pump drive shafts
Torsions bars
Shredder blade shafts
Splined shafts for printers
Door closer racks
Selector shafts for medium- and high-voltage switchgear
...
...