PROCESSES

Internal forming thin-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
- Forming of high strenght sheet metals
- 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 - sheet metal

Sheet metal components, splined, slotted and coined on GROB machines allow space-saving, lightweight elements which are eminently suitable for powertrain assemblies that shift under load. Typical examples are clutch disc carriers made of high-strength sheet steel. Tube-in-tube sets of steel or aluminium that telescope within each other along splines are used as drive shafts which incorporate safety functions.

Typical applications

Clutch plate carriers [cold forming / stroke-stamping / slotting / coining / forming]
Tube-in-tube sets for drive shafts [cold forming]
Sensor discs [cold forming / slotting / coining / forming]
...
...

ENGINE TECHNOLOGY - sheet metal

Sheet metal components, splined, slotted and coined on GROB machines are popular in both lightweight design applications and as highly accurate elements for speed detection.

Typical applications

Sensor Discs
Timing belt pulleys
Flex plates
Starter ring gears
...
...

AUTOMOTIVE ENGINEERING - sheet metal

In addition to engine and power train applications, GROB cold forming is used to produce various other cost-effective automotive components. A typical example is splined tubing for height adjustment in steering columns.

Typical applications

Tube-in-tube steering columns
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...