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Ball screw is an efficient transmission element that converts rotary motion into linear motion. It is widely used in CNC machine tools, automation equipment, precision instruments and other fields. Correct selection is essential to ensure equipment performance and extend service life. This article will introduce the key steps and precautions for ball screw selection in detail.   1. Determine the load conditions 1.1 Axial load Axial load is the primary consideration for ball screw selection. It is necessary to calculate the maximum axial force applied to the screw during operation. The calculation formula for axial load is:   1.2 Radial load and bending moment In some applications, ball screws may be subjected to radial loads or bending moments. These loads affect the life and accuracy of the screw, so comprehensive considerations are required when selecting.   2. Determine the stroke and speed 2.1 Stroke The stroke refers to the maximum distance the ball screw needs to move. Determine the stroke according to the range of motion of the equipment and ensure that the length of the selected screw meets the requirements.   2.2 Speed Speed ​​includes maximum moving speed and acceleration. According to the working requirements of the equipment, calculate the required moving speed and acceleration to ensure that the lead and speed of the selected screw can meet the speed requirements.   3. Select the lead and accuracy 3.1 Lead The lead refers to the distance the nut moves for each turn of the screw. The choice of lead directly affects the moving speed and resolution. The larger the lead, the faster the moving speed, but the lower the resolution; the smaller the lead, the higher the resolution, but the slower the moving speed.   3.2 Accuracy Accuracy is an important performance indicator of ball screws, including positioning accuracy and repeat positioning accuracy. According to the accuracy requirements of the equipment, select the appropriate accuracy grade. Common accuracy grades are C0, C1, C2, C3, C5, C7, C10, etc. The smaller the number, the higher the accuracy.   4. Determine the screw diameter and length 4.1 Screw diameter The selection of screw diameter is mainly based on axial load and speed. The larger the diameter, the stronger the load-bearing capacity, but the weight and cost are also higher. Select the appropriate diameter according to the load and speed requirements.   4.2 Screw length The selection of screw length needs to consider the stroke and installation space. Too long length may cause deflection, affecting accuracy and life, so it is necessary to select the appropriate length according to the actual situation.   5. Select nut type The nut types of ball screws include single nut and double nut. Single nut has a simple structure and low cost, but small preload; double nut has large preload and good rigidity, which is suitable for occasions with high precision and high rigidity requirements.   6. Consider lubrication and sealing 6.1 Lubrication Good lubrication can reduce friction and extend the life of the screw. Select the appropriate lubrication method according to the use environment, such as grease lubrication or oil lubrication.   6.2 Sealing The sealing device can prevent dust and impurities from entering the screw and affecting accuracy and life. Select the appropriate sealing method according to the use environment, such as dust ring or sealing ring.         Conclusion The selection of ball screw is a complex process, which requires comprehensive consideration of multiple factors such as load, speed, accuracy, life, etc. Through scientific selection methods, it can ensure that the ball screw performs best in the equipment, prolongs the service life, and improves the reliability of the equipment. We hope this article can provide valuable reference for your ball screw selection. If you have any needs, please contact us for more information.

As a key component of precision linear motion systems, the development of linear guides in the next three years will be closely centered around high-end manufacturing upgrades, the explosion of intelligent demand, and the deepening of industry applications. Nanjing Chunxin has begun to develop linear guide products linked to intelligence. The following is a detailed analysis of the core development trends: 1. Technology upgrade direction (1) Ultra-high precision and rigidity Nano-level repeatability: The demand for semiconductor equipment (such as photolithography machines) and optical inspection instruments drives the guide rail accuracy to ±0.1μm, which is achieved by optimizing the raceway grinding process and preload adaptive adjustment. Heavy-duty high-rigidity design: Heavy-duty fields such as wind turbine blade processing require guide rails with a static stiffness of more than 500 N/μm, using a multi-slider parallel structure and enhanced roller design. (2) High speed and low friction Speed ​​exceeds 5 m/s (such as packaging machinery), relying on ceramic balls and self-lubricating coatings (such as PTFE composite film) technology, and the friction coefficient is reduced to below 0.001. (3) Intelligent integration Built-in sensor rails: real-time monitoring of load, vibration, temperature, and feedback of wear status through edge computing (such as THK's "Smart Rails"). Self-adjusting system: AI algorithm dynamically adjusts preload and compensates for thermal deformation (especially suitable for high-precision machine tools).   2. Innovation in materials and manufacturing processes Lightweight materials: aluminum alloy rail skeleton (30% weight reduction) + ceramic balls, used in scenarios such as drone servos. Corrosion-resistant special steel: molybdenum-containing stainless steel or surface nitriding treatment is used in ships and chemical environments, and the life span is increased by 3 times. Additive manufacturing applications: 3D printing of complex rail end caps, integrated oil circuits and sensor slots (such as Siemens' directed energy deposition technology).   3. Industry application explosion point New energy field: power battery module stacking equipment: requires rails to be dustproof (IP67) + high speed (2m/s) + long life (10 years maintenance-free). Photovoltaic silicon wafer cutting machine: The demand for dust-resistant rails has surged, and the market size may exceed US$800 million in 2025. Semiconductor and panel manufacturing: Vacuum environment rails (no outgassing materials) are used for wafer handling robots, and global demand is expected to grow by 25% in 2026. Medical robots: Micro rails (width ≤ 15mm) are used for surgical robotic arms and must meet MRI compatibility (non-magnetic materials such as titanium alloys).   4. Market competition pattern Domestic substitution is accelerating: Chinese manufacturers (such as Guangdong Kate, Nanjing Technology, and Nanjing Chunxin) will increase their market share in small and medium-sized rails from 35% in 2023 to 50% in 2026, but the high-end market is still dominated by HIWIN and THK. Cost competition strategy: Large-scale production reduces the price of mid-range products by 10%-15%. Modular design (such as integrated guide rails and drive motor kits) reduces customer assembly costs.   5. Integration of emerging technologies Digital twin operation and maintenance: Build a life prediction model through rail operation data to reduce unplanned downtime by more than 50%.   6. Summary and suggestions The core competitiveness of linear guides in the next three years will be reflected in: Scenario-based innovation (such as explosion-proof guides for lithium battery workshops and clean guides for biological laboratories). Intelligent penetration (upgrade from a single moving part to a "perception-decision" terminal). Industry chain collaboration (co-building an ecosystem with servo motor and controller manufacturers).   If you are looking for high - quality products, welcome to visit our website at www.chunxinauto.com to learn more product information. We look forward to cooperating with you to jointly unlock a new chapter of creativity.   If you are interested in this article, you can contact us at WhatsApp or WeChat +86 17372250019