Hydropneumatic presses

 

Our range of presses has:

 

• 6 different standard C-frames and 60 cylinders allowing an unlimited number of combinations.
• a power capacity from 7 to 100 tonnes.
• a total stroke from 50 to 300 mm.
• a working stroke from 6 to 60 mm.
• 4 feet for guaranteed stability.

 

 

CHARACTERISTICS OF AN EMG HYDROPNEUMATIC PRESS:

 

The core characteristics of an EMG hydro pneumatic press lie in its patented compressed air cylinder featuring closed hydraulic circuits. This design allows attaining the requested loads with a stroke which is triggered when the piston gets a resistance. The action is very simple and similar to pneumatic double effect cylinders. The resulting air-over-oil" technology thus combines the speed of pneumatic with the multiplicative power effect of hydraulic systems, without any adverse effects (these include for example, no noisy, dirty massive hydraulic motors, and low air consumption). The result is perfect workmanship on every part, whatever the application.

 

Economical and silent, our C-frame presses require little or no maintenance.

Compared with manual presses, they offer greater power, stroke and speed, for perfect results on every operation or machined part.

 

 

Rapidity and Cycle Speed: Because the initial approach stroke is driven entirely by compressed air, an air hydraulic press operates much faster than a standard hydraulic press. The rapid descent and retraction speeds significantly reduce overall cycle times. This makes the hydro pneumatic press machine ideal for high-volume, continuous manufacturing where throughput is critical.	Power and Multiplicative Force  Despite its compact footprint, an air powered hydraulic press can generate between 7 and 100 tonnes of pressing force. By leveraging Pascal’s principle, the internal hydraulic intensifier converts a standard 80 PSI shop air supply into immense hydraulic fluid pressure, delivering full tonnage at the end of the stroke, exactly when the tool contacts the workpiece.
Quality and Precision: Precision positioning is a hallmark of a high-end hydraulic pneumatic press machine. Unlike pure pneumatic systems that can suffer from an uncontrolled "air spring" effect causing violent breakthrough shocks, the hydraulic dampening within our presses ensures a smooth, shockless, and incredibly powerful squeeze. This guarantees +/-.001” repeatability, preserving delicate tooling and ensuring consistent component quality across millions of cycles.	Economy and Energy Efficiency: Investing in an air operated hydraulic press yields immediate cost savings. The machine consumes energy only during the active press stroke. As a result, it can reduce energy consumption by up to approximately 70% compared to a traditional hydraulic press with a constantly running electric motor. Furthermore, the initial investment is highly competitive, often costing a fraction of a full hydraulic system.
Quiet and Ergonomic Operation: Workplace safety and ergonomics are paramount. By eliminating the mechanical compression springs and the continuous hum of hydraulic pumps, our hydro pneumatic presses operate at exceptionally low noise levels. This contributes to a safer, less fatiguing environment for press operators.	Zero Maintenance Requirements: Economical and resilient, our hydro pneumatic press range requires virtually no maintenance compared to traditional hydraulic units. Because the hydraulic oil is self-contained within a small, sealed intensifier circuit, there are no messy fluid leaks, no large oil reservoirs to monitor, and no complex pump motors to service. Routine care is generally limited to simple pneumatic filter checks, drastically reducing expensive machine downtime.

 

 

Our commitment

 

EMG has been a French manufacturer of bench, workshop and industrial presses for over 50 years. Quality is our priority. For us, it's the result of a flawless process. Our aim is to design the perfect oleo-pneumatic press to meet your needs, while respecting 5 essential commitments:

• a work in the rules of the art
• guaranteed long-term strength
• fast delivery times
• a very good quality/price ratio
• a total listening and understanding of your expectations.

 

 

 

Understanding the internal mechanics of an air hydraulic press reveals why it is so highly regarded for assembly press and forming press machine tasks. The operation relies on the principle of differential areas, using low-pressure compressed air over a large piston area to generate extremely high-pressure hydraulic fluid over a smaller plunger area.The standard operating cycle of a hydro pneumatic press is divided into three distinct and highly controlled phases

 

 

Because a hydro pneumatic press delivers exceptional power and precision (specifically at the critical end of the stroke) it is an incredibly versatile asset on the factory floor. The unique ability to rapidly approach a part and then seamlessly transition into a high-pressure, controlled working stroke makes the air hydraulic press perfectly suited for a vast array of complex manufacturing operations that require force without destructive impact.

 

Process-Specific Capabilities

 

• Assembly and Press-Fitting

Interference fits, where one component is forcefully inserted into another to create a permanent mechanical bond, demand both extreme force and perfect alignment. An air powered hydraulic press is ideal as Assembly press for inserting bearings into cast housings, pressing bushings, installing dowel pins, and seating heavy-duty seals. The hydraulic dampening ensures that delicate bearing races are seated squarely without the shattering impact that pure pneumatic cylinders might cause.

 

• Joining, Riveting, and Clinching

When fasteners like bolts are not viable, materials must be joined by deformation. Hydro pneumatic presses excel as riveting press, swaging, and staking. Clinching requires the exact force profile generated by an air operated hydraulic press. The press carefully manages the lowering speed and applies immense force at the absolute bottom dead center (BDC) to securely interlock the metals.

 

• Precision Cutting, Punching, and Blanking

While mechanical power presses are often used for high-speed cutting, using a hydraulic pneumatic press machine as a press cutting machine or punch press machine, provides superior edge quality for intricate punching, trimming, and die-cutting tasks. The sustained hydraulic force slices through thin metals and rigid plastics cleanly, while the machine's robust frame absorbs the breakthrough shock, extending the lifespan of expensive custom dies.

 

• Bending, Forming, and Compacting 

Manipulating sheet metal into precise geometries, such as brackets or flanged components, requires a steady application of force to overcome the material's yield strength and prevent "springback". Furthermore, the continuous force delivery makes these presses highly effective as bending press or forming press machine for powder compaction in metallurgy and ceramics or compressing soap or materials in recycling facilities to reduce waste volume.
Key Industries Utilizing our Air Operated Hydraulic Presses

 

The adaptability of the EMG hydro pneumatic press machine has led to its widespread adoption across highly regulated and demanding sectors :

 

• Automotive Manufacturing: The automotive sector relies heavily on the air hydraulic press for both sub-assembly and structural forming. They are routinely deployed for pressing wheel bearings, forming suspension brackets, assembling fuel injectors, and stamping critical chassis components where safety and repeatability cannot be compromised.
• Aerospace and Defense: In aerospace, materials like titanium and high-strength aluminum alloys must be formed with zero tolerance for micro-fractures. The secure, vibration-free, and consistent power stroke of a hydro pneumatic press ensures the structural integrity of flight-critical components and the security of military munitions.
• Medical Device Manufacturing: Cleanliness is paramount in the medical field. Because an air powered hydraulic press confines its hydraulic fluid within a small internal intensifier and utilizes dry compressed air for movement, the risk of oil mist contamination is virtually eliminated. This makes them the standard choice for cleanroom environments, used in molding syringe parts or assembling precision surgical instruments.
• Electronics and Appliances: Delicate circuit boards, sensors, and consumer appliance components require a press that can deliver a "soft touch" approach followed by a firm, calibrated squeeze. The modular and highly controlled nature of these presses ensures that fragile electronic housings are snapped together or crimped without shattering.
   

 

 

To explore our complete range of industrial press,

discover our main press machine catalog. For constant and linear power during manual assembly tasks, a rack and pinion press provides reliable operation up to 5000kg. If your application requires maximum force precisely at the end of the stroke for crimping or fine cutting, a manual toggle press is the ideal solution. For environments requiring higher output rates and adjustable air-driven force up to 6000kg, a Pneumatic press delivers fast and precise cycles. When unparalleled productivity and high-speed operations are essential, an eccentric mechanical press offers robust capacities ranging from 6 to 80 tonnes. Finally, for part identification, numbering, or riveting applications requiring consistent striking power, an impact press machine ensures perfect repeatability with its built-in double-strike prevention device.