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Shutai explains the following situation for you Ball screws are usually made of the following materials: 1. Shaft material: Commonly used shaft materials include carbon steel, alloy steel and stainless steel. These materials have high strength and good stiffness, making them suitable for applications with high loads and torsional forces. 2. Nuts: Common materials include brass and alloy steel. Brass nuts have good wear resistance and self-lubricating properties, while alloy steel nuts have higher strength and wear resistance. 3. Balls: Balls are usually made of steel and have high hardness and wear resistance. Ball diameter and material selection will depend on the requirements of the specific application. It should be noted that the material selection of the ball screw will also depend on the specific requirements of the application, such as load, speed, environmental conditions, etc. Therefore, specific application scenarios may require selecting a suitable material combination. If you have any other questions, please contact us WhatsApp: +86 17372250019 WeChat: +86 17372250019

As a kind of precision transmission element, the ball screw bears a large load during the working process. It is widely used in automation equipment, such as industrial robots, automatic loaders, laser processing machines, handling devices, ATC devices of machining centers, etc. It is most suitable for use in combined devices of rotational motion and linear motion. In order to ensure its normal operation and extend its service life, maintenance and care are essential. Today we will briefly understand the maintenance and care methods of ball screws. 1. Clean regularly. During use, the ball screw may accumulate foreign matter such as dust and sand. These foreign matter will not only affect its normal operation, but also cause wear. Therefore, foreign matter inside the spline should be cleaned regularly with tools such as vacuum cleaners or air guns to ensure that its internal cleaning is unobstructed. 2. Lubrication. Select appropriate grease or lubricating oil and lubricate the ball screw regularly to reduce friction resistance, reduce wear and extend service life. At the same time, lubrication can also play a role in cooling and noise reduction, and improve the overall performance of the mechanical system. 3. Regularly check whether the bearing is damaged or severely worn. If there is any problem, it should be replaced in time; check whether the key teeth are deformed or damaged, and adjust or replace them if necessary; check whether the ball screw shaft end is bent or damaged, and repair or replace it if necessary. The ball screw threads also needs to be checked for foreign matter stuck inside. In addition, it should be ensured that all components are firmly installed without looseness to maintain the stability of the equipment. 4. Anti-corrosion treatment, when stored and idle, it should be avoided from being exposed to high humidity and strong acid and alkali environments. At the same time, regular maintenance and anti-corrosion treatment of the ball screw can extend its service life. The maintenance and maintenance of the ball screw must be carried out strictly in accordance with the machine manual and relevant maintenance requirements. It cannot be carried out blindly to avoid unnecessary damage to the ball screw. At the same time, maintenance and maintenance records should be kept to facilitate tracking and troubleshooting. In order to ensure production efficiency and product quality, it is crucial to master maintenance methods.

In the fields of industrial automation and CNC machine tools, ball screws are the core transmission element that converts rotational motion into linear motion. Many people often make an intuitive mistake when selecting a screw: simply thinking that "the thicker the lead screw, the heavier things can be lifted." In fact, the "carrying capacity" of a ball screw is a comprehensive index determined by the force direction, static/dynamic mechanical limits, and system installation constraints. For specialized applications, such as a precision ball screw for medical device applications, understanding the load-bearing capacity of the screw rod is especially important. It is not only related to whether the mechanical structure can push and pull normally, but also directly determines the operating accuracy and service life of the equipment. Core force principle: only "push and pull" is allowed, "side attack" is strictly prohibited First of all, it is necessary to clarify the most fundamental force characteristics of the ball screw: it can only bear axial force. • Ideal state: All load forces are concentrated along the central axis of the screw (thrust or pull). • Physical taboos: The screw nut is extremely taboo against bearing radial forces or overturning moments. If the structure is improperly designed, allowing the screw to directly hang heavy objects or bear lateral cutting forces will cause the balls to be unevenly stressed in the raceway, leading to eccentric wear, vibration, and even the slide rail becoming stuck or broken in a short period of time. This is particularly important when using a customized 4005 non-standard ball screw, as its design should be matched to the specific load, installation conditions, and operating requirements of the equipment. Engineering standard practice: Linear guides or guide shafts must be configured in the mechanism to absorb all lateral weight and tilting moments, so that the ball screw purely plays the role of "providing axial push and pull power". Two core parameters for selection: dynamic load vs static load In the sample manual provided by the manufacturer, the two most critical indicators for evaluating load-bearing capacity are the rated dynamic load and the rated static load. 1. Rated dynamic load: determines "how long it can be used" It refers to the constant axial load that 90% of the screws can withstand without metal fatigue spalling when the rated operating life of a set of identical ball screws is revolutions (1 million revolutions). Selection rule of thumb: The average axial load in actual work is usually controlled within 10% ~ 30% of the dynamic rated load. If the screw is operated under high load for a long time, the life of the screw will be reduced exponentially. 2. Rated static load: determines "whether it will be crushed" It refers to the ultimate axial load when the contact surface between the most stressed ball and the raceway produces the maximum permanent deformation (indentation) when the screw is stationary or running at very low speed. Once the actual impact force exceeds, pits that are difficult to detect with the naked eye will appear inside the raceway. After that, every time the nut passes through a pit, it will vibrate violently, and the accuracy will be lost instantly. The “three physical limits” that determine the actual load capacity Even if the rated load of the selected nut is large enough, in the real physical world, the actual load capacity of the screw will be limited by the following three boundary conditions: 1. Instability limit of pressure rod (slenderness ratio and compressive yield) When the ball screw is subjected to axial thrust (compressive stress), if the screw is too thin or too long, it will be "bent" from the middle like a bamboo pole. This phenomenon is called strut instability. 2. Load bottleneck of support bearings The ball screw nut pushes the load, but the reaction force on the nut will eventually be transmitted to the fixed end support bearings (such as angular contact ball bearings) at both ends of the screw. In many high-load conditions, the screw itself is not broken, nor is the nut. Instead, the fixed seat bearing is crushed first. The allowable axial load of the bearing must be checked when selecting. Correction of operating environment and working conditions When calculating the actual force, the theoretical axial force must be multiplied by the working condition coefficient to derive the equivalent dynamic load: • 1. Smooth and impact-free (such as optical instruments, precision measuring equipment) • 2. General automation • 3. Heavy load/strong impact Summary Evaluating and improving the load-bearing capacity of ball screws is essentially a system engineering balance: • Structurally: Use guide rails to absorb lateral forces to ensure that the screw only bears pure axial force. • Calculation: Calculate the required, combined with the expected life, and leave sufficient margin with the impact coefficient. • Physically: Verify the instability limit of the pressure rod under long strokes and ensure that the end fixed bearing can match the same endurance level. Only when the screw body, support bearings and guide rail structure are considered as a whole can the stability and durability of the mechanical system be ensured while maximizing the load-bearing potential.