The advantages of using aluminium profiles to manufacture robot arms

The use of aluminium profiles to manufacture robot arms (including industrial robotic arms, collaborative robots, mobile robot arms, etc.) has become a mainstream and optimized choice in the modern automation field. Compared with traditional steel, cast iron or other materials, aluminium profiles have a series of key advantages in the application of robot arms, which can directly affect the performance, efficiency and cost of the robots.

The following are the core benefits of using aluminium profiles for the robot arm, analyzed from multiple perspectives:

I.Lightweighting and Dynamic Performance

1. Lightweight, enhanced speed and acceleration

The density of aluminium is approximately 2.7g/cm³, which is only one third of that of steel (about 7.8 g/cm³).

For the robotic arm, the reduction in self-weight directly leads to : higher movement speed and acceleration; reduced inertia, lower motor load, and the ability to achieve faster cycles.

Smaller motor and reducer requirements: Smaller-sized driving components can be selected to reduce costs.

Lower energy consumption: The lightweight structure significantly reduces the power consumption during operation.

• Optimize the ratio of load to self-weight

The key performance indicators of the robot arm are the ratio of its load capacity to its own weight. The high strength of aluminum profiles combined with lightweight design enables the robot to carry a greater load while remaining lightweight itself, making it particularly suitable for collaborative robots and mobile robots (such as the mechanical arms installed on AGVs).

II. Strength and Structural Properties

1. Excellent strength and rigidity

When 6 series aluminum alloys (such as 6061, 6063, 6082) undergo heat treatment (T5/T6 state), their tensile strength can reach 200-310 MPa, which is close to that of ordinary carbon steel, while the modulus of elasticity is approximately one-third of that of steel.

By adopting reasonable cross-sectional designs (such as hollow profiles and reinforced structures), it is possible to achieve sufficient rigidity and torsional resistance while maintaining lightweight. This meets the requirements of the robot arm for positioning accuracy and repetitive positioning accuracy.

2. Excellent fatigue resistance performance

During operation, the robotic arm is subjected to repeated stress cycles. The 6 series aluminum alloy has excellent fatigue strength and is suitable for applications involving long-term and high-frequency movements.

3. Excellent vibration damping performance

The damping coefficient of aluminum is higher than that of steel. It can effectively absorb and attenuate vibrations, which helps improve the stability and trajectory accuracy of the robot’s movement and reduces end-point jitter.

III. Manufacturing and Design Flexibility

1. Easy to be extruded and formed, enabling the creation of complex cross-sections

Aluminum profiles can be manufactured through the hot extrusion process to produce various complex cross-sectional shapes, such as:

Hollow structure (reduces weight)

Built-in cable channels (facilitating the routing of air pipes and wires)

Integrated design of guide rails and sliding channels (simplifies assembly)

This level of design flexibility is something that steel cannot achieve.

2. Modularization and Rapid Assembly

Aluminum profiles are typically designed with standardized slots, combined with specialized connecting components (angle brackets, T-type nuts, bolts, etc.), enabling seamless and rapid assembly without welding.

For the design of the robotic arm, this means:

Shorten the development cycle: Quickly build prototypes and samples.

Easy to adjust and modify: The arm length and structural form can be flexibly changed according to the requirements.

Reduce manufacturing complexity: No need for complex welding processes and tooling.

3. Excellent machining performance

The aluminum profiles have excellent cutting processing properties. They offer high efficiency for operations such as drilling, milling, and tapping, with minimal tool wear and easy realization of high-precision processing.