Die-Cast Components for Robots: Advantages & Latest Breakthroughs in 2025

As humanoid robots edge closer to mass production, die-casting technology has emerged as a game-changer for manufacturing high-performance, cost-effective robot parts. Here's the latest progress and core advantages of this innovation:

Core Advantages of Die-Cast Robot Components

Die-cast parts (typically made of aluminum or magnesium alloys) solve two critical pain points for robot development: lightweighting and scalability:

Unmatched Lightweight PerformanceAluminum die-cast components are 30-50% lighter than steel alternatives while retaining high structural strength. For humanoid robots, every 1kg weight reduction boosts battery life by 3-5 minutes-a key factor for practical deployment.

Cost & Efficiency GainsIntegrated die-casting replaces traditional multi-step machining (e.g., forging + milling), cutting production time by 50x and material waste by 90%. This drives component costs down by 60%, a vital leap for scaling robot production.

Precision & DurabilityVacuum high-pressure die-casting ensures dimensional accuracy within ±0.01mm, fitting the tight tolerances of robot assemblies. These parts also pass 10,000+ cycle fatigue tests, meeting the demands of dynamic robot movements.

Latest 2025 Breakthrough: Domestic Die-Cast Robot Skeletons Enter Mass Production

On December 18, 2025, China's CITIC Dicastal announced the mass production of its first domestically developed vacuum high-pressure die-cast humanoid robot leg skeleton components. Key details:

The aluminum alloy leg parts (4 core models) are now shipping to local robot clients, with an initial batch of 20 units delivered.

The components cut the robot's overall weight by 15% while supporting its load-bearing and locomotion needs.

CITIC Dicastal (a global leader in automotive aluminum components) leveraged 37 years of lightweight expertise to adapt die-casting for robots-completing R&D to mass production in just 12 months.

Industry Momentum: Die-Casting Becomes a Core Robot Supply Chain Focus

2025 has seen a surge in die-cast robot part adoption:

Lizhong Group secured a ¥75 million order (5,000 sets of robot structural parts, including skeletons and joints) with Chinese robot firm Weijing Intelligence.

Unitree Robotics uses magnesium die-cast joints in its Leggy robot, achieving a 40% weight reduction vs. traditional designs.

The 2025 market size for China's robot aluminum die-cast parts is projected to hit ¥12.8 billion (≈$1.78 billion), growing 65% year-over-year.

Die-casting is no longer just an automotive manufacturing technique-it's now a cornerstone of making humanoid robots lighter, cheaper, and ready for real-world use.