Ball Screw Rotating Nut

The ball screw rotating nut, as a composite functional component, ingeniously integrates the linear motion characteristics of the ball screw with the rotational motion function. Its core advantages lie in: it can not only efficiently transmit axial loads to meet power transmission requirements but also allow the nut to freely rotate around the screw axis, thereby constructing a more flexible motion coupling relationship in the mechanical structure. This design breaks through the limitation that traditional ball screws can only achieve single linear motion, providing an innovative solution with both bearing capacity and rotational freedom for precision mechanical transmission systems, especially suitable for scenarios of automated equipment and precision instruments requiring composite motion control.

The ball screw nut pair is composed of a screw, a nut, a ball and a return guide device (bead return device). The screw and the nut are machined with arc-shaped spiral grooves, which are suit together to form a spiral raceway, and the raceway is filled with balls.

1.Product Features of Ball Screw Rotating Nut

• Transmission Efficiency and Energy Consumption Optimization

High-efficiency transmission performance: The transmission efficiency reaches an excellent range of 90% to 96%, significantly surpassing traditional trapezoidal screws. Frictional loss is only 25% to 33% of that in traditional screws, drastically reducing energy consumption while enhancing system response speed.

• Bidirectional Transmission and Motion Precision

Zero-lag bidirectional transmission: Leveraging a rolling friction mechanism, it enables bidirectional transmission without hysteresis. The motion is smooth without crawling, supporting micrometer-level fine feeding to meet precise control requirements.

Nanometer-level positioning capability: Reverse backlash is eliminated via a pre-tightening clearance removal structure, achieving repeat positioning accuracy ≤1μm (C5 grade standard), suitable for high-precision scenarios like semiconductor equipment.

High-rigidity structural design: A four-row raceway layout enhances axial stiffness, capable of withstanding dynamic impact loads ≥6910N and demonstrating superior anti-deformation performance.

• Longevity and Maintenance Advantages

Upgraded wear resistance: The rolling friction mode of the ball screw rotating nut significantly reduces wear, with a theoretical service life exceeding 10,000 hours-more than 10 times that of sliding screws.

Sealing and lubrication design: Equipped with standard IP54-grade rubber/polyurethane seals to block pollutants effectively. Pre-set oil injection holes are compatible with various lubricants (e.g., lithium-based grease), ensuring long maintenance cycles and low cleaning requirements.

• Integrated Structural Innovations

Integrated bearing design: The outer cylinder of the ball screw rotating nut and special bearings adopt a 45° contact angle combination, automatically compensating for assembly errors and improving installation compatibility.

Compact installation solution: The integrated design of the ball screw rotating nut and support bearings allows direct locking to the support base during installation, saving space and simplifying assembly.

Multi-scenario structural adaptability: Supports various circulation structures, including internal circulation (for miniaturization), external circulation (high-temperature environments), and end-cover type (large lead conditions).

2.Application Challenges and Material Solutions

• Usage limitations and countermeasures:

Lacks self-locking, requiring additional braking devices for vertical installations to prevent load slippage.

High manufacturing costs due to precision raceway processing and high-performance materials (e.g., nickel-based alloys, ceramic balls).

• Material selection guidelines:

Inconel-718 nickel-based alloy for high-temperature environments.

1Cr15Co14Mo5VN stainless steel for corrosive scenarios.

GCr15 bearing steel for heavy-duty, high-precision applications.

3. Applications of Ball Screw Rotating Nuts

Industrial Robots

• Precision Joint Drive

Used for robot joints, the nut rotating design integrates support bearings to directly drive the mechanical arm to achieve composite rotational and linear motion, improving space utilization and dynamic response accuracy.

• End Effector Control

Drives the gripper mechanism of welding/assembly robots. The high transmission efficiency (90%-96%) reduces motor load and extends continuous operation time.

Semiconductor and Precision Manufacturing

• Wafer Transmission System

Drives wafer manipulators to achieve nanometer-level step positioning (C5-level accuracy), avoiding backslash from affecting lithography precision.

• Optical Inspection Platform

Controls multi-axis linkage of the stage. The low friction characteristics (friction coefficient ≤ 0.003) ensure smooth and jitter-free scanning trajectories.

• High-Speed CNC Equipment

ATC Tool Magazine Tool Change Mechanism
The large lead design (40-50mm) enables simultaneous rotation of the tool arm and linear insertion/extraction, compressing the tool change time to within 1.5 seconds.

• Laser Cutting Head Drive

Supports high-speed rotational feed with a DN value exceeding 150,000. The impact-resistant bearing structure adapts to high-frequency vibration loads.

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• ISO 9001 Certification

The DLY production system has obtained ISO 9001 quality management system certification, covering the entire process from design, manufacturing to inspection, strictly ensuring process consistency and traceability for each batch of ball screw rotating nut.

• Raw Material Control

ball screw rotating nut are made of 20CrMo material (hardness 60-64 HRC), complying with international standards, which can maintain excellent anti-deformation capability under high-load working conditions. All raw materials are required to undergo rechecks on chemical compositions and mechanical properties before warehousing, eliminating unqualified materials from entering the production process at the source.

• Quality Certification System

DLY products have passed a number of international authoritative certifications such as ISO 9001 quality management system certification, CE certification, and RoHS certification, fully demonstrating that the products meet international general standards and industry quality requirements. The authoritative qualifications endorse product quality and effectively enhance market trust.

Inventory and Delivery

Our factory maintains abundant inventory of this product, ensuring high delivery efficiency. The preparation and packaging cycle typically ranges from 3 to 15 days. For large shipments, we conventionally use wooden cases to guarantee product safety during transportation.

Quality Assurance Policies and Terms

• Standard Warranty Period: Provides 12-month warranty coverage for material defects and manufacturing process issues.
• Warranty Scope: Includes non-human-induced damages such as screw fracture, nut jamming, and ball detachment, requiring submission of purchase certificates and inspection reports.
• Exceptions: Damages caused by overload, insufficient lubrication, or improper installation are not covered by the warranty.

Technical Support and Fault Response

• Installation Guidance

Offers free installation guidance (in paper documents or video format), focusing on preload adjustment, end support (BK/BF seat) installation, and anti-interference key points. Remote video guidance is available, and P2/P4 preload grade solutions can be matched for high-speed application scenarios.

Fault Diagnosis

• Common Issue Responses:

Abnormal noise: Mostly due to reverser wear or insufficient lubrication; replacing the reverser is recommended.

• Precision degradation: Requires detection of axial clearance (C7 grade standard ≤52μm/300mm). If out of tolerance, apply for factory return for grinding repair.

Detection support: Provides precision inspection report comparison services to assist in problem troubleshooting.

Value-Added Services and Customized Support

Customized After-Sales Service

• Length customization: Supports screw length customization (100-6000mm). Non-standard parts enjoy the same warranty during the warranty period, requiring submission of design drawings.
• Lubrication solutions: For high-temperature and high-speed scenarios, customized solid lubrication film services are available to reduce crawling and optimize operational stability.

Extended Warranty and Long-Term Cooperation

Supports warranty extension with reasonable fees. We look forward to establishing long-term and stable cooperation to achieve mutual benefit.

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Maintenance

• Anti-rust Treatment and Lubrication:

The ball screw rotating nut of our company are pre-treated with anti-rust coating before delivery. Before use, please clean the anti-rust oil thoroughly and immediately apply lubricating oil. If rust occurs due to failure to apply lubricant, we will not provide free warranty services.

Long-term Storage:

If the product is not used within one month after purchase, regular anti-rust treatment is required. The frequency of anti-rust treatment should be adjusted according to the temperature difference in different regions.

• Regular Inspection and Cleaning:

Inspect the condition of the nuts monthly.

If contaminated by dust or metal particles, clean with kerosene first and then apply lubricant.

• Lubricant Maintenance:

The ball screw rotating nut must be kept lubricated at all times. Free warranty will not be provided for rust or damage caused by lack of lubrication.

Use

• Prohibition of Unauthorized Disassembly:

Due to the strict technical requirements for the assembly of ball screw rotating nut, do not disassemble the nuts without authorization to avoid damaging the entire ball screw set and causing equipment failure.

• Vertical Installation Precautions:

When installing the ball screw vertically, pay special attention to preventing the nut from slipping. In case of accidental slipping, contact our authorized company immediately for assistance.

• Environmental Requirements and Protection:

Use the product in a clean environment and install a protective cover outside to prevent dust and metal particles from entering, which may affect product accuracy and service life.

• Temperature Limitation:

Do not use the product in an environment exceeding 80°C (except for heat-resistant specifications), as it may damage the seals and shorten the service life.

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