Collaborative Robots
Tolerance Typically ISO 2768-m. Tighter tolerances of +/- 0.05 mm are achievable on specific features but will increase machining time and cost. · min feature Min Wall Thickness: ~1.0 mm; Min Hole Diameter: ~1.0 mm (highly dependent on material and depth-to-diameter ratio).
| Physical Properties | |
| Density | 1.05 |
|---|---|
| Tensile Strength | 45.0 |
| Max Service Temp | 78.0 |
| Hardness | R105 |
| Standard Tolerance | Typically ISO 2768-m. Tighter tolerances of +/- 0.05 mm are achievable on specific features but will increase machining time and cost. |
| Manufacturing Limits | |
| Equipment Specs | Clamping Force: 1300 kN; Tie Bar Spacing (H x V): 460 x 460 mm; Max Mold Size (H x V): 450 x 450 mm; Screw Diameter Options: 28mm, 32mm, 36mm; Max Shot Volume (PS): ~154 cm³ (with 36mm screw); Injection Speed: up to 300 mm/s; Ejector Stroke: 100 mm. |
| Min Feature Size | Min Wall Thickness: ~1.0 mm; Min Hole Diameter: ~1.0 mm (highly dependent on material and depth-to-diameter ratio). |
| Precision Grade | Capable of achieving dimensional tolerances of ±0.02 mm to ±0.05 mm on critical features, consistently holding an IT7-IT8 grade with a high-quality mold and stable process control. |
| Commercial | |
| Factory Advantage | Processing ABS for high-gloss robotic components demands strict process control, particularly managing its high melt viscosity and hygroscopic nature. Our approach leverages the Sumitomo SE-EV-A 130T's all-electric direct-drive system, which provides the exceptional shot-to-shot consistency needed to overcome flow inconsistencies. The Z-Molding control allows us to precisely manage injection pressure and fill speed, effectively eliminating weld line weakness and flow marks. By meticulously pre-drying the material as required and utilizing the Sumitomo's stable, high-speed clamping, MechanoFab produces net-shape parts with superior surface finish and dimensional accuracy in a single step. This ensures components for collaborative robots meet both aesthetic standards and tight assembly tolerances right out of the mold. |
| Target Volume | Optimized for 1,000-25,000 units |
Technical Deep Dive
Collaborative Robots ABS Standard Injection Molding with Sumitomo SE-EV-A 130T
As an engineer designing the next generation of human-interactive automation, you operate at the intersection of aesthetics, safety, and mechanical precision. The housings, bezels, and structural components for Collaborative Robots aren't just plastic shells; they are the primary interface between a powerful machine and a human operator. They demand a Class-A surface finish straight from the mold, absolute dimensional stability for seamless assembly, and the inherent toughness to withstand the rigors of an industrial environment. This is a materials and processing challenge of the highest order, and it's where most off-the-shelf molding solutions fail. The common culprit is the material itself: Acrylonitrile Butadiene Styrene, or ABS. While prized for its impact resistance and rigidity, its high melt viscosity and profoundly hygroscopic nature make it notoriously difficult to process. The result? Unacceptable flow marks, weak weld lines where melt fronts meet, and dimensional inconsistencies that throw assembly tolerances out the window.
At MechanoFab, we don't just tolerate these challenges; we've engineered a complete system to master them. We’ve paired a specific, high-flow grade of ABS (Chi Mei PA-757K) with a meticulously controlled Standard Injection Molding process, all orchestrated by a machine built for this exact level of precision: the Sumitomo SE-EV-A 130T. This isn't just about squirting plastic into a mold. It's a technical deep dive into managing melt flow, controlling pressure gradients at a granular level, and ensuring absolute shot-to-shot repeatability. This combination allows us to produce net-shape, high-gloss robotic components that meet stringent aesthetic and functional requirements in a single, highly repeatable step, eliminating the need for costly and inconsistent secondary finishing operations.
Aligning with the Unforgiving Standards of Cobot Design
Manufacturing components for collaborative robots means navigating a stringent regulatory landscape where safety and reliability are non-negotiable. Your designs must adhere to standards like ISO/TS 15066, ISO 10218-1, and carry CE/UL markings, all of which place immense pressure on the integrity of every single component. Our process is architected from the ground up to ensure your parts meet and exceed these requirements.
ISO/TS 15066 (Safety of Collaborative Robots): This technical specification is the bedrock of cobot safety, focusing on the design and implementation of systems where humans and robots share a workspace. A key principle is the mitigation of injury through design. This is where our process control becomes a critical safety feature. A poorly molded part with a weak weld line or internal stress can fail catastrophically under unexpected load or impact, turning a collaborative application into a hazardous one. Our use of the Sumitomo's Z-Molding flow front control actively minimizes molded-in stress and creates significantly stronger weld lines by reducing the injection pressure required to fill the cavity. Furthermore, the standard emphasizes smooth, rounded surfaces to minimize injury during contact. Our ability to produce high-gloss, defect-free surfaces with no flash or sharp edges directly contributes to this requirement, ensuring the robot's physical interface is as safe as its control system.
ISO 10218-1 (Robots and Robotic Devices - Safety Requirements): This broader standard for industrial robots also emphasizes mechanical integrity. The reliability of the robot over its entire lifecycle is paramount. The hygroscopic nature of ABS means that any moisture in the pellets turns to steam at processing temperatures, leading to splay marks on the surface and, more dangerously, hydrolytic degradation of the polymer chains. This results in a brittle part that may pass initial QC but fail prematurely in the field. Our process begins with meticulous, documented material pre-drying in dehumidifying hopper dryers, ensuring the resin's moisture content is well below the 0.1% threshold before it ever enters the barrel. This, combined with the shot-to-shot consistency of the all-electric press, guarantees that the mechanical properties of part #25,000 are identical to part #1, ensuring the long-term reliability demanded by ISO 10218-1.
CE/UL Compliance: Achieving CE marking or UL listing requires exhaustive documentation, traceability, and process validation. An unstable manufacturing process introduces variables that can invalidate your testing and certification. Our reliance on the Sumitomo SE-EV-A 130T all-electric platform provides a digitally controlled, fully monitored process. Every critical parameter—injection speed, pressure, temperature, clamping force, and cycle time—is logged. This creates an unimpeachable data record for your technical file, proving that every part was manufactured within the exact parameters that produced your certified test articles. This level of process discipline de-risks your compliance journey and accelerates your time to market.
Technical Specification Deep Dive: Material, Process, and Machine
To achieve the required outcomes for cobot components, we must operate within a tightly defined process window. The parameters below are not just guidelines; they are the core specifications of our production capability, representing the synthesis of material science, process engineering, and machine technology.
| Parameter Group | Specification | Value / Detail |
|---|---|---|
| Material Properties | Material | ABS (Chi Mei PA-757K) |
| Density | 1.05 g/cm³ | |
| Tensile Strength (Yield) | 45.0 MPa | |
| Max Service Temperature | 78.0 °C | |
| Hardness (Rockwell) | R105 | |
| Process Limits | Standard Tolerance | ISO 2768-m (general) |
| Achievable Tolerance | ±0.05 mm on critical features | |
| Min. Wall Thickness | ~1.0 mm | |
| Min. Hole Diameter | ~1.0 mm (feature dependent) | |
| Machine Parameters | Equipment | Sumitomo SE-EV-A 130T (All-Electric) |
| Clamping Force | 1300 kN | |
| Tie Bar Spacing (H x V) | 460 x 460 mm | |
| Max Mold Size (H x V) | 450 x 450 mm | |
| Max Shot Volume (PS) | ~154 cm³ (with 36mm screw) | |
| Max Injection Speed | 300 mm/s | |
| Precision Grade | IT7-IT8 (±0.02 mm to ±0.05 mm) |
Cost & Volume Dynamics: The TCO of Precision
This specific manufacturing cell is optimized for production volumes between 1,000 and 25,000 units. This range represents the economic sweet spot where the initial, non-recurring engineering (NRE) and tooling costs are amortized effectively across the part volume, delivering a competitive piece-part price without requiring the capital outlay of massive, multi-cavity tooling systems. However, the true economic advantage of our approach lies in reducing your Total Cost of Ownership (TCO) through superior process control.
The core of this advantage is our mastery over the challenges of ABS, enabled by the Sumitomo SE-EV-A 130T's architecture. Let's break down the engineering reality. Processing ABS for high-gloss robotic components is a battle against its fundamental properties. Its high melt viscosity means it resists flowing into thin sections or complex geometries, requiring high injection pressures. This high pressure, in turn, can cause flash, warp, and high levels of molded-in stress, which leads to dimensional instability and premature failure. Furthermore, its hygroscopic nature means it acts like a sponge for ambient moisture. As mentioned, failure to properly dry the material results in steam generation during molding, causing cosmetic splay and severe embrittlement of the final part.
Our solution is a multi-faceted strategy. First, we leverage the Sumitomo's all-electric, direct-drive system. Unlike hydraulic machines which can have pressure and speed variations due to fluid temperature and valve response times, the direct-drive servomotors provide instantaneous response and unparalleled shot-to-shot consistency. This precision is the foundation for overcoming the flow inconsistencies inherent to ABS. We can replicate the exact injection profile, time and time again, to within milliseconds and micrometers.
The second, and perhaps most critical, element is the Sumitomo's proprietary Z-Molding control system. Traditional molding relies on a "pack and hold" phase where high pressure is maintained to compensate for material shrinkage. This is a primary source of molded-in stress. Z-Molding is a fundamentally different philosophy. It utilizes a "flow front control" algorithm that allows us to fill the mold cavity at a lower, more consistent pressure. The system intelligently modulates injection speed and pressure to maintain a uniform melt front velocity, effectively "persuading" the material to fill the mold rather than forcing it. This elegant approach drastically reduces the pressure needed, which directly translates to:
- Elimination of Flow Marks: By maintaining a consistent melt front, we prevent the turbulent flow that causes visible "read-through" of part features and gloss variation on the surface.
- Stronger Weld Lines: Where two melt fronts meet, a weld line is formed. High-pressure, high-speed filling can trap air and prevent the polymer chains from properly entangling, creating a significant weak point. The low-pressure, controlled fill of Z-Molding allows the fronts to merge gently, creating a molecularly stronger bond and a visually imperceptible seam.
- Reduced Molded-in Stress: Lower packing pressure means the polymer chains are not as highly oriented and "frozen" in a state of tension. This results in a more dimensionally stable part that is far less prone to warping after ejection or during post-molding thermal cycles.
Finally, we combine this advanced machine control with process fundamentals. Meticulous pre-drying of the Chi Mei PA-757K resin is a non-negotiable first step. We utilize the Sumitomo's stable, high-speed clamping mechanism to ensure the mold remains perfectly sealed during injection, preventing flash even with complex parting lines. The result of this synthesis is the ability to produce net-shape parts with superior surface finish and tight dimensional accuracy in a single step. For you, the design engineer, this means the parts you receive are ready for assembly. There is no TCO overhead from scrap, rework, or secondary operations like sanding, painting, or polishing. The components for your collaborative robots meet both the demanding aesthetic standards for human interaction and the tight assembly tolerances required for precision mechanics, right out of the mold.
From Design to Production
You've engineered a complex system; allow us to handle the complexity of its physical realization. Our process is designed to translate your CAD model into a flawless physical component with maximum efficiency and reliability. If you are designing parts for collaborative robotics and require the impact strength of ABS without compromising on surface finish or dimensional accuracy, this manufacturing cell is your solution.