hydraulic vs mechanical

8/3/2019 Hydraulic vs Mechanical

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IMPROVE YOUR PRESS SHOP TECHNOLOGY

Hydraulic Press vs Mechanical Press

1

Hydraulic Pressversus

Mechanical Press

www.hydraulico.com





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Hydraulic press

Single-acting

Single-acting with passive cushion

- In bed or ram

Double-acting with inner ramDouble-acting with active cushion

(single acting press with active cushion)

Triple-acting with inner ram and active bed cushion

Triple-acting with passive ram cushion andactive/passive bed cushion

(single-acting press with active cushion in ram and bed)

Mechanical press

Single-acting

Single-acting with passive :

- air cushion in bed/ram

- hydraulic cushion in bed

Double-acting (inner and outer ram)

- passive cushion, pneumatic or hydraulic





3

DEEP

DRAWING

PUNCHING

PIERCING

A B I L I T Y

FORMING FLANGING RESTRIKE EMBOSSING TRIMMING BANKING





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Hydraulic presses versus mechanical presses

DEEP

DRAWING

PUNCHING

PIERCING

A B I L I T Y






5

Hydraulic presses versus mechanical presses

DEEP

DRAWING

PUNCHING

PIERCING

A B I L I T Y






6

DEEP

DRAWING

PUNCHING

PIERCING

A B I L I T Y



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Deep drawing

Function Hydraulic press DA Mechanical press DA

Forming force Full tonnage at full stroke Limited tonnage at limted stroke

Emboss force Adjustable in tonnage Restricted to position

Blankhold force Adjustable during stroke(overload control of blank and press)

Restricted to position(overload control only on press)

Forming speed Adjustable during stroke Fixed curve

Dwell at BDC Programable Not available

Forming down Yes Yes

Forming up Yes No

Die wear Good Bad

Limitations PPM Depth of part, complexity of part




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Blanking and trimming

Function Hydraulic press DA Mechanical press DA

Blanking force Full tonnage Full tonnage available

Surface quality of cut Good Better

PPM Medium High

Shock Shock absorbers needed Small

Die wear Medium Medium

Energy High Low




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Other characteristica

Hydraulic press

• The programable forming speed and blankholderforce are optimum

• Programable impact at die closing

• Flexibility to die hights• Die change: index 100

• Run in die : index 100

• Fast and simple repair

• Best for low and medium batch quantities

• Cycle time 5 sec+handling 2,7-4 sec

• ( 6.6- 8 PPM)

•

Dynamic force control + 1 PPM ( 3 cyl action)• Leaks belongs to the past

• LOW Investment

Mechanical press

• Link presses are more versatile than excentricdriven presses.

• Excentric presses gives high impact speed at die

closing ( bad draw condition. Bad for die, cushion,clutch and brake.

• Limitations to die hights ( max +/-300 mm)

• Die change: index 125 - 150

• Run in die: index 150 - 300

• Best for high batch quantities

• Cycle time 3.5 sec+handling 2.5 – 4 sec

• (8-12 PPM)

• Expensive and slow to repair

• Risk factor is high in case of break down

• HIGH Investment





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TRENDS in automotive

• 40 years ago: Hydraulic press lines (flexibility, low volume, complex part

geometry)

• 20 years ago: Mechanical presses (high volume, simple part geometry)

• Last 10 years: Hydraulic and mechanical press lines (just in time or high volume)

Future requirements:

• Just In time > smaller runs > short change over time & flexibility

• Low weight > High strength steel: sensible controllable forming speeds

•

Synchronised load and unload





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Thank you for watching this presentation

Hydraulico as

Raadhusgade 87 · 8300 Odder · Denmark

Tel.: +45 8780 2000 Fax: +45 8780 2001

E-mail: [email protected]

www.hydraulico.com

hydraulic vs mechanical

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