Robot Mould: Precision Injection Moulds for Robot Housings, Gears & Structural Parts
Robot Mould: High-End Precision Injection Moulds for Industrial, Service & Humanoid Robots
The robot industry is moving from factory floors into homes, logistics and service scenarios. Whether it is a six-axis industrial arm, a collaborative robot, a vacuum robot, a delivery robot or a humanoid robot, the plastic housings, joints, gears and structural brackets behind these machines call for extreme dimensional accuracy, strength and durability — and behind those parts are precisely engineered robot moulds. A robot mould is the heart of this precision chain: the quality of every robot mould directly decides the assembly fit, running noise and service life of the whole robot.
A robot mould is not simply an enlarged appliance mould: it must handle the high wear and high shrinkage of glass-fibre-reinforced materials such as PA66+GF30, master the moulding of self-lubricating materials such as POM for gears, and deliver the high-gloss, flaw-free surfaces expected of PC+ABS flame-retardant cosmetic parts. With more than 20 years of precision injection mould experience, SinoMould provides robot brands worldwide with one-stop service from DFM feasibility analysis, mould design and tooling to injection moulding production. Every robot mould is validated through mould-flow simulation, precision machining and T1 trial shots, so the robot mould stays dimensionally stable and durable over mass production.
Choosing a SinoMould robot injection mould gives you more than a tool — it gives you process assurance for mass production. Gear-mesh accuracy, joint clearances and housing assembly gaps are all locked in during the robot mould design stage. Whether you need a robot housing mould, a POM gear mould or a structural robot parts mould, SinoMould delivers a robot mould proven in high-volume manufacturing. Partner with us and your next robot mould will be engineered right the first time — a robot injection mould built for precision, consistency and long tool life.
Robot Mould Specification Table (Incorporating Material Characteristics of Robot Components)
The following table defines mould specifications item by item for robot gear moulds, structural component moulds, and housing moulds, following the parameter listing style of the official mould section.
Parameter | Specification | Remarks |
Material | PA66+GF30/50, POM (POM-C), PC+ABS, ABS, PC, PA6+GF | POM for gears, glass fibre reinforced PA for structural parts, flame retardant PC+ABS for housings |
Cavity / Core Steel | S136 / S136H, NAK80, 718H, 738H + nitriding/hard chrome plating for POM gear areas | Glass fibre materials cause severe wear; gear areas require high hardness wear resistant coating |
Hardness | HRC 48–54 (HRC 52+ for glass fibre areas) | Resists glass fibre erosion wear, ensuring gear tooth profile life |
Mould Type | Two plate/three plate mould, hot runner, rotary core pulling (gear moulds), secondary ejection | Gear tooth profiles require forced demoulding or rotary core pulling structures |
Cavitation | 1×1 to 8×8 (depending on part size and capacity) | Small parts such as gears: 8 cavities or more; large housings: 1+1 |
Gear Precision | Involute tolerance DIN 7–9 grade, controllable tooth profile/lead | Robot reducer/transmission gears demand high precision for low noise and long life |
Parting Line | Precision parting, flash control ≤0.02 mm | Prevents glass fibre flash sticking and ensures burr free appearance |
Tolerance | Critical functional dimensions ±0.01–0.02 mm, general ±0.05 mm | Joint fits and gear centre distances require high precision |
Shrinkage Compensation | PA66+GF 0.3%–0.8%, POM 1.8%–2.2% (anisotropic directional compensation) | Glass fibre orientation causes anisotropic shrinkage; mould flow prediction required |
Gating | Pin point gate, submarine gate, multi point injection (large housings) | Balanced filling, concealed gates; centre gate for gear parts |
Cooling System | Conformal cooling channels + zoned mould temperature control | Controls glass fibre orientation, reduces warpage and gear deformation |
Ejection System | Ejector pins + ejector blocks + stripper plate; rotary discharge/angled lifters for gears | Prevents ejector marks and damage on glass fibre parts; reduces residual stress at gear roots |
Mould Temperature | PA66: 80–120°C; POM: 60–90°C; PC+ABS: 70–110°C | Zoned temperature control according to material crystallization/gloss requirements |
Machine Tonnage | 90T–1600T (depending on projected area and clamping force) | Large robot housings require high clamping force to prevent mold opening |
Mould Base Standard | LKM / Futaba standard mould base, thickened A/S plates | Gear moulds use additional guide pins and bushings for improved clamping accuracy |
Mould Life | ≥500,000 – 1,000,000 cycles (wear resistant design for glass fibre areas) | Glass fibre reinforced materials cause significant wear; wear resistant coatings and regular maintenance required |
Mould Inspection | CMM, gear measuring instrument, projector, roughness tester | 100% gear precision inspection before delivery with T1 report issued |
Key Technical Points for Robot Moulds
Point 1 – Wear Resistant Design for Glass Fibre Reinforced Materials: PA66+GF30/50 has poor flowability and causes severe wear. Cavities use high hardness steel + hard chrome plating/nitriding. Gates and runner areas prone to wear are hardened to ensure robot mould life.
Point 2 – Precision Moulding of POM Gears: Rotary core pulling/forced demoulding structures are used, with centre gating for balanced filling. Shrinkage and tooth profile errors are controlled to achieve low noise, long life robot injection mould standards for gear meshing.
Point 3 – Anisotropic Shrinkage Control: Glass fibre reinforced materials shrink differently along and perpendicular to the flow direction. Mould flow analysis prediction + conformal cooling adjustment ensure robot mould dimensional stability without warpage.
Point 4 – High Gloss, Mark Free Appearance: Exterior parts such as robot housings use mirror polishing SPI A1–A2 + valve gate hot runners + mould temperature control to achieve uniform assembly gaps and zero surface defects for robot housing mould quality.
Point 5 – Thin Wall High Strength Structures: Robot structural parts often contain thin wall ribs, clips, and hinges. Precision inserts and local hardening are required to prevent whitening or breakage during part removal.
Point 6 – Venting System Design: Venting slots/vent pins are provided at the parting line and around inserts to prevent gas entrapment and burning of glass fibre materials – avoiding black spots and poor filling.
Point 7 – Mass Production Consistency and Traceability: Standard mould base + high hardness hardened steel + complete T1/T2 trial moulding ensure consistency of over 500,000 cycles and batch traceability for robot parts moulds.
One Stop Service: From DFM to Mass Production
Step 1 – DFM Feasibility Analysis: Evaluate moulding feasibility for mass production and optimise structure, wall thickness, and gating based on robot part materials and operating conditions.
Step 2 – Mould Design & Manufacturing: 3D/2D design, Moldflow analysis, gear precision simulation, precision machining, assembly, and T1–T2 trial moulding.
Step 3 – Injection Molding Mass Production: In house injection workshop with 50 injection molding machines (100T–4000T), stable batch delivery of robot parts.
For four application categories – industrial robots, collaborative robots, service robots, and humanoid robots – SINOMOULD has established dedicated robot mould design specifications: industrial robot structural component moulds emphasise strength and service life; gear moulds emphasise POM precision and low noise; service robot housing moulds emphasise high gloss appearance and flame retardant safety; humanoid robot joint moulds emphasise thin wall lightweighting and high precision. Whichever type of robot injection mould you need, SINOMOULD can deliver rapidly with a mature methodology and manufacturing system.
SINOMOULD Robot Mould Showcase
Robot Mould FAQ
Q: What level of precision can be achieved with a gear mould robot mould?
A: POM gears can achieve DIN 7 grade involute precision, with controllable tooth profile and lead. Combined with rotary core pulling and secondary ejection structures, they meet the low noise, long life requirements of reducers and transmission systems.
Q: How is the service life of a robot mould for glass fibre reinforced materials ensured?
A: HRC52+ high hardness steel with hard chrome plating/nitriding wear resistant coating is used. Wear prone areas are hardened. The design life is 500,000–1,000,000 cycles, supported by regular maintenance.
Q: How is the highgloss surface of a robot housing mould achieved?
A: Mirror polished SPI A1–A2 cavities + valve gate hot runners + zoned mould temperature control eliminate weld lines and flow marks, ensuring uniform assembly gaps and zero surface defects.
Q: Can PC+ABS flameretardant housings and PA66 structural parts be produced with the same service package?
A: Yes. SINOMOULD provides complete robot mould development and injection molding for multiple materials and parts, with unified mould flow analysis and project management, shortening the overall machine iteration cycle.