We are standing at the dawn of the explosion of the humanoid robot industry. When the Tesla Optimus Gen-3 accurately grasps small objects under the spotlight, and when the Boston Dynamics Atlas completes a series of stunning complex movements, one of the true core technologies behind it is condensed in the "nimble hands" that simulate human hands. The dexterous hand is the ultimate carrier for humanoid robots to interact with the physical world and perform refined tasks. Its performance directly determines the breadth and value of robot applications. In the transmission scheme of dexterous hands, tendon technology, known as the "muscle" of robots, has become the core path to achieve high degrees of freedom, lightweight, and low cost.

As pointed out in the industry analysis report, the proportion of tendon rope in the total cost of dexterous hands is about 30%, and its value is rapidly increasing with technological iteration. Currently, material innovation is pushing this key component to new heights - PBO fibers, with their outstanding performance surpassing traditional ultra-high molecular weight polyethylene (UHMWPE), are becoming the ideal choice for the next generation of dexterous hand tendon ropes.

However, materials with ultimate performance also bring about extreme processing challenges. As a technical team that has been deeply involved in the field of industrial lasers for many years, Guanghui Laser is well aware that accurately, efficiently, and non destructively processing PBO fiber, a "super material", into tendon ropes that meet strict standards is a huge gap in the industrial chain. How to analyze and solve this technical pain point, and how to provide the ultimate solution for the high-quality and efficient production of PBO tendon ropes with the core technology advantage of high brightness fiber lasers, fully empowering the innovative development of the humanoid robot industry, has become another key issue for us!

-NO.1-
Why PBO
The inevitable evolution of tendon rope materials for dexterous hands

To understand the processing difficulties, it is necessary to first clarify the excellence of PBO materials and the inevitability of their application, especially the advantages of PBO fiber performance compared to the widely used UHMWPE. Specifically:

oneUltimate strength and modulusThe tensile strength of PBO fiber is as high as 5.8 GPa, and the modulus is 270 GPa, which are 1.7 times and 2.4 times higher than UHMWPE, respectively. This means that under the same thickness, PBO tendon ropes can withstand greater loads, transmit more accurate force control signals, and significantly improve the gripping force and operational accuracy of dexterous hands.

twoExcellent thermal stabilityThe decomposition temperature of PBO is as high as 650 ℃, far exceeding the 150 ℃ of UHMWPE. This feature ensures that the temperature rise caused by motor heating during long-term operation or high load conditions of the dexterous hand will not affect the dimensional stability and mechanical performance of the tendon rope, greatly improving reliability.

threeExcellent creep resistance performanceUnder sustained stress of 60N, the failure time of PBO material can reach up to 19 years. This is crucial for dexterous hands that require long-term maintenance of posture and accuracy, avoiding positioning deviations caused by material creep.

fourLow density and environmental resistanceThe density is only 1.54g/cm ³, which is lighter than carbon fiber and has excellent acid and alkali corrosion resistance.

Its performance advantage determines that PBO is an inevitable choice to meet the high load, high precision, and high reliability requirements of future dexterous hands. International leading robot manufacturers have started testing PBO tendon rope solutions and are expected to enter mass production in 2025-2026.

-NO.2-
Pain points in PBO processing
The 'powerlessness' of traditional craftsmanship and ordinary lasers

PBO fiber combines numerous advantages, but its extremely high heat resistance and extraordinary molecular stability make it a typical "difficult to process material". In the production process of tendon ropes, cutting is a key process that determines the quality, length accuracy, and final service life of their end faces. Traditional processing methods are facing severe challenges here:

The Tragedy of Mechanical Cutting

①Burr and brushed edgesPBO fiber has excellent toughness, and mechanical blade cutting can easily produce difficult to eliminate burrs and wire drawing. These tiny flaws can become stress concentration points during the high-frequency stretching rebound motion of the tendon rope, accelerating wear and even leading to fracture. Usually, the tendon of humanoid robots needs to pass over 2 million fatigue tests, and the presence of burrs is fatal.

②Tool wear and costThe high strength and hardness of PBO can cause severe wear on cutting tools, leading to frequent tool changes, increased production costs, and affecting machining consistency

③Crushing deformationMechanical pressure may cause the fiber end face to crush and deform, affecting its ability to pass through precision sleeves and increasing transmission friction.

Core pain points

The cutting of PBO tendon requires not only "cutting", but also "high-quality minimally invasive cutting". It requires an advanced processing method that can achieve a minimal heat affected zone, no mechanical stress, and a smooth and even cut. This is precisely the technical bottleneck that humanoid robot companies must overcome when seeking tendon rope solutions.

-NO.3-
High brightness fiber laser
The way to break the tendon rope with Guanghui laser PBO

In response to the above pain points, Guanghui Laser has launched a special solution based on high brightness fiber lasers with years of technological accumulation, providing a perfect answer for the precision processing of PBO tendon ropes. The core principle lies in the ability to control the ultimate laser energy. High brightness is the key to victory. Laser brightness is essentially the core indicator for measuring its energy concentration. The Guanghui high brightness fiber laser outputs a "perfect" beam with extremely high beam quality (M ² factor approaching 1) and extremely uniform energy distribution through unique beam shaping technology and core device optimization. How can this specifically solve the problem of PBO processing?

oneExtremely small heat affected zone, safeguarding the original performance of the material:The high brightness beam of the Guanghui laser can precisely focus enormous energy on a very small point. When cutting PBO fibers, energy acts instantly (in microseconds or even nanoseconds) on a very small area, causing the material to rapidly vaporize and evaporate rather than slowly conducting heat. This minimizes the diffusion of heat to surrounding fibers, thereby controlling the heat affected zone at the micrometer level. This means that the cutting surface is hardly damaged by heat, maintaining the original high strength and modulus of PBO fibers, ensuring the reliability of the tendon rope in millions of cycles of testing.

twoThe incision is smooth and flat, eliminating fatigue hazards from the source:Due to the concentration and stability of energy, high-intensity lasers can achieve a "super fast thermal processing" effect similar to "cold processing". The cut PBO fiber end face is smooth, flat, without burrs or melt beads. This high-quality incision significantly reduces the friction coefficient between the tendon rope and the sleeve during transmission, eliminating stress concentration and wear problems caused by uneven incisions from the source, directly improving the fatigue resistance and service life of the product.

3. Non contact processing to avoid physical damage:Laser processing is non-contact, completely avoiding physical damage such as crushing and deformation caused by mechanical cutting. The processing consistency is extremely high, especially suitable for advanced materials such as PBO, which have high value and high requirements.

4. Intelligent control empowers efficient mass production:Guanghui high brightness fiber laser can be seamlessly integrated with automation systems to achieve fixed length, high-speed, and precise cutting of tendons and ropes. The laser has excellent power stability and fast response capability, coupled with a process database specially developed for PBO materials, which can ensure that the cutting quality of each tendon rope is stable and reliable in large-scale production, empowering robot enterprises to achieve efficient and high-quality production capacity ramp up.

-NO.4-
Advance together hand in hand
Empowering the Future of Humanoid Robotics Industry

The humanoid robot industry is a comprehensive competition involving multiple fields such as materials, transmission, control, and AI. As the core actuator, the performance breakthrough of the dexterous hand cannot be achieved without the advancement of every technology upstream in the industrial chain. Guanghui Laser is the 'enabler' in this crucial link. We not only provide advanced laser hardware, but also offer a complete set of process solutions based on high-performance fiber cutting such as PBO and UHMWPE. Our technical team is willing to collaborate closely with every explorer in the field of humanoid robots to optimize processing techniques and overcome manufacturing challenges.

The evolution of tendon materials from UHMWPE to PBO is a microcosm of the pursuit of ultimate performance by humanoid robots. The innovation of processing technology is the bridge that enables top-level materials to move from the laboratory to the mass production line. Guanghui Laser High Brightness Fiber Laser is willing to become such a solid and reliable bridge. We use excellent beam quality, ultimate energy control, and clever process adaptability to precisely solve the bottleneck of precision processing of PBO tendon ropes. We are committed to making every tendon rope flawless and equipping humanoid robots with the most sensitive and reliable "hands" to welcome the arrival of the intelligent manufacturing era together.

If you are looking for reliable processing solutions for the selection, trial production or mass production of tendon rope of humanoid robot dexterous hand, please contact us through official website, official account and other channels. Guanghui Laser is willing to use the sharpness, benefits, and innovation of "light" to help your robotics business move forward steadily.