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PROCESS

Cold forming sheet metal

The GROB cold forming process is based on a straightforward and universally applicable principle: the total forming effort needed is broken down into numerous forming increments spread along the entire cylindrical length of the zone being formed.

Benefits

- Very short forming cycles
- Affordable tooling costs
- Superior spline and gear quality
- Surface work-hardening
- Ability to form high-strength steels
- Compensation for the elastic recovery behaviour of the material

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

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DATA PROTECTION

This subdivision means that the forces needed to achieve superior forming rates and high degrees of deformation are relatively low, allowing ready-to-install precision spline geometries to be produced.

As its name implies, the applied process is a pure forming technique during which no swarf is generated.

Using rolling tools a blank is formed onto a roller mandrel (support die).

Depending on the requirements, different process applications are employed. These include splining from cup-shaped blanks, spinning and splining from disc-shaped blanks, or direct splining from disc-shaped blanks (direct cold reduction).

As a result, a diversity of profile geometries can be produced on internally and/or externally splined workpieces.

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]
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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
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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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BRAKE DISCS - sheet metal

High-precision, splined and slotted cup shapes preformed from light-gauge sheet metal are pressed into brake friction rings. The resultant lightweight disc brakes offer significant weight savings compared to cast iron brake discs.

Typical applications

Composite brake discs
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