Hydraulic Press Brake vs Electric Press Brake: Which Is ...

I. Introduction

If you work in the sheet metal bending industry, you must be familiar with press brake machines. A press brake is an important tool that can bend, shape, and cut metal plates into various forms and sizes.

With competitive price and timely delivery, HAVEN sincerely hope to be your supplier and partner.

With the development of technology, press brake technology continues to be upgraded from manual to electric. Currently, the main types of press brake machines &#; are hydraulic, electric, and hybrid press brakes. The most widely used press brakes are hydraulic and electric press brakes.

This article will discuss the differences, advantages, and disadvantages of these two types of press brakes to help you make a more informed choice. The following video is about hydraulic press brake vs electric press brake:

II. What Are Hydraulic Press Brakes?

Hydraulic press brakes have been dominant in the field of sheet metal bending since their inception. The power source of the hydraulic press brake is the hydraulic cylinder, which pushes the ram to apply force to the metal plate for bending.

The traditional hydraulic press brake has a hydraulic system where hydraulic oil is pumped into the cylinder to generate force. The pressure generated by the synchronous hydraulic cylinder forces the crossbeam or ram to press down onto the bending metal plate.

The hydraulic system provides high tonnage for hydraulic press brakes, suitable for heavy-duty bending. The hydraulic system can also accurately control the movement of the ram, providing accurate and consistent bending.

The hydraulic press brake machine also includes a mechanical, hydraulic hybrid system and an electric hydraulic system. Each type of hydraulic press brake has its own unique functions and advantages.

Some hydraulic press brakes may also have more advanced functions, such as CNC control or automatic tooling change systems. The CNC hydraulic press brake has a large tonnage range and is ideal for bending thicker materials.

Moreover, it can also bend different types of metals, from aluminium to stainless steel. The hydraulic press brake is also very durable, and proper use and maintenance can extend its service life.

III. How Does A Hydraulic Press Brake Work?

The hydraulic press brake uses a motor-driven hydraulic pump to transport hydraulic oil to the valve, guiding the pressurized oil to the cylinder. The hydraulic cylinder pushes the ram downward to apply pressure on the metal sheet, causing it to bend into the desired shape.

The operator places the metal sheet on the workbench, and the back gauge needs to clamp the material to prevent it from moving during the bending process. The back gauge can be manually adjusted or automatically adjusted by a CNC controller.

The operator presses the pedal or activates the hydraulic system through the controller. The hydraulic oil is pumped into the cylinder, and the pressure generated causes the ram to apply pressure to the metal plate to achieve bending.

The size of the bending force and the length of the bending can be set according to the required workpiece size. After a bending is completed, the hydraulic system releases pressure, allowing the ram to move back to its original position.

IV. What Are Electric Press Brakes?

Electric press brakes are also processing machines used for metal bending and forming. Unlike hydraulic press brakes, electric press brakes use electric motors instead of hydraulic oil to provide power to the ram, so there is no pollution problem such as hydraulic oil leakage and waste oil disposal, which is more environmentally friendly.

The electric motor drives the ball screw or belt to move the ram and apply pressure to the metal plate. Electric press brakes offer higher precision than hydraulic press brakes. Through this precise and repetitive bending, a precise workpiece can be completed.

Due to the fact that the electric motor does not use hydraulic oil to generate pressure, it makes less noise when used. And the power of the electric press brake is only consumed when the ram moves, which can save energy consumption.

Taking a 100-ton press brake as an example, assuming an 8-hour workday, the power consumption of a fully servo electric press brake is about 12 kWh/day. In contrast, the power consumption of the hydraulic system in a hydraulic press brake is about 60 kWh/day. The fully electric servo press brake saves about 80% in energy.

The body and structure of the electric press brake are simpler, with fewer components and easier maintenance. The types of electric press brakes include fully electric press brakes and hybrid electric press brakes. The fully electric press brake only uses an electric motor as the power source to push the ram to move.

The hybrid electric press brake may use both an electric motor and a hydraulic system to provide power support. Electric press brakes can be programmed for automatic bending, making them suitable for automated and large-scale production.

V. How Does An Electric Press Brake Machine Work?

The working principles of electric press brakes and hydraulic press brakes are basically similar, with the main difference being the different power sources. The electric press brake machine uses an electric motor to drive the ram to move downwards and apply pressure to the metal sheet for bending.

After each bending step is completed, the motor releases pressure, and the ram returns to its original position. By repeating this process, the bending of the workpiece is achieved. The hybrid electric press brake is powered by a combination of an electric motor and a hydraulic system.

VI. Electric Press Brake vs. Hydraulic Press Brake: Which is Better?

The hydraulic press brake is a widely used machine due to its powerful power and versatility. Electric press brakes are a relatively new technology that has become increasingly popular in recent years due to their energy efficiency and automation capabilities.

Both types of hydraulic press brake and servo electric press brake have their unique characteristics, with significant differences in structure, working principle, performance, and other aspects. Choosing the right press brake depends on your application needs, budget, and production volume. Below is a detailed comparative analysis of electric and hydraulic press brakes.

1. Structural Differences

Hydraulic press brake is mainly composed of a workbench, hydraulic system, control system, and frame. The hydraulic system includes components such as the main oil cylinder, oil tank, oil pump, and directional valve. The hydraulic bending machine uses the pressure generated by pumping hydraulic oil to achieve up and down movement of the ram, thereby completing the bending of the sheet metal.

Electric press brakes usually include ram, workbenches, electric motor transmission mechanisms, cantilever devices, electronic control systems, etc. Its transmission method is the electric motor drive, which drives the ram and workbench up and down through transmission mechanisms such as gears and reducers.

2. Working Principles Differences

The hydraulic press brake mainly pumps hydraulic oil into the cylinder through a hydraulic cylinder, causing the cylinder piston to move upwards. From this, push the ram down and the workbench up to achieve the bending of the sheet.

The electric press brake is composed of a transmission mechanism through an electric motor. This drives the ram and the workbench to move up and down, achieving the bending of the sheet metal.

In contrast, the working principle of hydraulic press brakes is more stable and reliable.

3. Performance Differences

The hydraulic press brake has the following characteristics:

• High bending force: Hydraulic press brakes have strong pressure and torque and can process thicker metal sheets.
• Fast bending speed: Adopting hydraulic direct drive, the speed can be adjusted, the bending speed is fast, and the production volume is large.
• Good stability: The hydraulic system can adjust the pressure, which can better control the bending angle and accuracy, and the bending effect is stable and reliable.

The electric press brake has the following characteristics:

• Simple and convenient operation: the electric press brake is easy to operate, does not require professional personnel, and has low investment costs.
• Automation: electric machines can be programmed to automatically perform multiple bends, reducing the need for manual labour.
• Low noise: due to the lack of hydraulic oil being pumped, the operation of electric presses are silent than that of hydraulic press brakes.
• Easy maintenance: the transmission mechanism is relatively simple, with fewer moving parts than hydraulic machines, so easier than the maintenance of hydraulic press brake machine.
• Energy efficiency: electric press brakes consume less energy compared to hydraulic press brakes, and only use electricity when the ram is moving.
• Cost: the cost of the machine are usually expensive than electric press brakes. The electric press brakes are mainly used for small-scale production.
• High transmission accuracy: electric bending machines typically use servo motors to drive ball screws or belts, achieving precise motion control of the slider. This design effectively reduces mechanical errors, ensuring higher bending accuracy.

4. Material Compatibility

Thick Materials: Hydraulic press brakes are better suited for bending thick or high-strength materials often used in construction, shipbuilding, and heavy manufacturing. Their higher force capacity enables them to handle demanding tasks that electric press brakes may not be able to perform effectively.

Thin Materials: Electric press brakes are ideal for thin materials like sheet metal, offering precision and repeatability for intricate bends and tight tolerances.

VII. Advantages and Disadvantages of Each Technology

A. Hydraulic Press Brakes

Advantages

High Force Capacity: Hydraulic press brakes generate high bending forces, handling thick materials like steel, aluminum, and brass, essential for shipbuilding, construction beams, and automotive chassis manufacturing.

Versatility Across Industries: These machines can process various materials and thicknesses, making them suitable for industries like automotive, aerospace, and construction. Their ability to perform complex bends with multi-step sequences enhances adaptability for intricate designs.

Durable in Heavy-Duty Applications: Hydraulic press brakes are built to last, maintaining performance with minimal downtime in high-demand environments.

Cost-Effectiveness in Mass Production: Hydraulic press brakes are efficient for large-scale production due to their precision and minimal material waste, consolidating multiple tasks into one machine.

Advanced Safety Features: Modern hydraulic systems have safety mechanisms such as emergency stop buttons, light curtains, and gradual force application to protect operators.

Disadvantages

Higher Energy Consumption: Hydraulic press brakes need continuous pump and motor operation to maintain pressure, leading to higher energy use and increased costs compared to electric models.

Frequent Maintenance Causes Downtime: Hydraulic systems need regular oil changes, filter replacements, and seal inspections to prevent leaks and maintain performance, increasing costs and causing machine downtime that disrupts production.

Slower Cycle Times Compared to Electric Models: Hydraulic press brakes operate slower than electric models due to hydraulic fluid movement and stroke adjustments, which can be a disadvantage in high-volume production where speed is critical.

Environmental Concerns: Hydraulic systems risk fluid leaks, potentially contaminating soil and water, posing environmental concerns for sustainability-focused industries.

Space Requirements: Hydraulic press brakes need significant space for operation and material handling, posing challenges for smaller workshops.

B. Electric Press Brakes

Advantages

Superior Precision and Repeatability: Electric press brakes provide high precision and repeatability, achieving 1 micron accuracy with servo motor control, ideal for aerospace and medical device manufacturing.

Faster Cycle Times for Increased Productivity: Electric models operate with faster ram speeds and shorter cycle times compared to hydraulic systems (up to 35% faster), enabling higher throughput in production environments.

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Energy Efficiency Reduces Operational Costs: Electric press brakes use energy only during bending, unlike hydraulic systems needing constant power. This can cut electricity use by up to 50%, saving costs significantly.

Quiet Operation Enhances Workplace Comfort: Electric systems operate more quietly than hydraulic machines due to the absence of constantly running pumps, benefiting noise-sensitive environments and worker well-being.

Ease of Maintenance: Electric press brakes require minimal maintenance due to fewer moving parts, reducing downtime and costs. Advanced diagnostic systems in electric models streamline troubleshooting.

Adaptability and Programmability: Electric press brakes with CNC integration enable programmable bending sequences, reducing setup times and enhancing flexibility.

Disadvantages

Limited Force Capacity for Heavy-Duty Tasks: Electric press brakes lack the power of hydraulic systems, making them unsuitable for bending thick or hard materials, limiting their use in industries like shipbuilding or large-scale construction.

Higher Initial Investment Costs: Electric press brakes have higher upfront costs due to their advanced technology and precision, which can be prohibitive for small-to-medium businesses with limited budgets.

Complex Maintenance Requirements: Electric presses need less frequent maintenance but rely on complex electrical components, making repairs costly and requiring specialized expertise.

Suitability Limited to Specific Applications: Electric press brakes are ideal for precision bending of lighter materials and smaller production runs, but may lack versatility for diverse material types or thicknesses.

Electrical Hazards: Electric press brakes pose risks like faulty wiring or improper grounding. Follow safety protocols to mitigate these risks.

VIII. FAQs

1. Which press brake type is more energy-efficient?

Electric press brakes are more energy-efficient because they consume power only during the bending process, unlike hydraulic press brakes, which require continuous power to maintain hydraulic pressure.

This on-demand power usage significantly reduces energy consumption, making electric press brakes both cost-effective and environmentally friendly over time.

2. What are the maintenance costs associated with hydraulic and electric press brakes?

Hydraulic press brakes have higher maintenance costs due to complex hydraulic systems needing regular fluid changes, filter replacements, and seal inspections, costing hundreds to thousands annually based on size and usage.

Electric press brakes have lower costs with simpler systems, avoiding regular oil changes or filter replacements, but may require specialized expertise for electrical components. Overall, electric press brakes offer more cost-effective maintenance.

3. What are the environmental impacts of hydraulic press brakes compared to electric ones?

Electric press brakes have a lower environmental impact than hydraulic ones. They are more energy-efficient, operating only during bending and shutting off when idle, reducing power consumption and emissions.

They eliminate hydraulic fluid leak risks and produce less noise. Overall, they offer a more sustainable option by minimizing energy use, emissions, noise, and environmental contamination.

IX. Conclusion

When deciding to select the right press brake on the market, please consider your business needs, production capacity, and energy efficiency goals. If you use thicker materials that require higher tonnage or precise control of the bending process, a hydraulic press brake may be a better choice.

On the other hand, if you prefer machines with low energy consumption, high automation, and low noise, an electrical press brake may be a better choice.

Compared to electric press brakes, hydraulic press brakes often have a higher initial cost. However, in the long run, well-maintained hydraulic press brakes can save money because they have a longer lifespan.

We are a manufacturer of professional press brakes, laser cutting machines, shearing machines, and other machines with a history of 20 years. If you are interested in purchasing a press brake now, you can browse our official website. If you are interested in our products, you can contact our sales personnel.