What are the common fault phenomena of ball nut screw pairs?

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Common faults: 1. The nut is unscrewed out from one end of the ball thread, and it needs to be repaired by a professional lead screw factory, because professional tools are needed.

2. The preload of the lead screw pair is reduced or disappears, because the lead screw pair has been adjusted according to the customer's requirements before leaving the factory, so this item needs to be returned to the manufacturer for maintenance.

3. The reverse structure of the lead screw pair nut is damaged and needs to be returned to the manufacturer for replacement.

4. The screw thread raceway is worn, and the transmission or positioning accuracy of the screw pair is reduced, if the user has high requirements for accuracy, the screw pair can only be scrapped and redone.

In short, the ball screw pair is a kind of precision parts, and most of the failures can only be returned to the lead screw factory for repair, and the user will only repair it by himself. See for yourself!

The failure of the ball screw pair with high precision requirements should be the loss of accuracy, mainly due to the loss of preload caused by the wear of the raceway.

For the general lead screw, it is mainly the pitting corrosion of the lead screw raceway, which leads to the unstable operation of the steel ball. Generally, it cannot be repaired, and the raceway can only be re-grinded, but the nut needs to be remade, which costs a lot more, so it is better to buy one as a whole.

For the lead screw pair with a large load, there will be a phenomenon that the reverse part is impacted, and it can only be repaired by returning to the original manufacturer.

The ball screw is a more precise component, it is best to do a good job of sealing, do not let the fine chips into the nut body, at the same time, the assembly accuracy is better, to avoid the nut by the radial force caused by the uneven bearing of the raceway and accelerate the wear.

A lot, you can be specific, and then it's good for you.

1. The accuracy of precision ball screws does not meet the requirements.

The ball screw has been inspected for accuracy when it is put into storage, which can eliminate its own quality problems.

2. Improper assembly damages the accuracy of the lead screw.

Through understanding, the assembly workers are familiar with the precision ball screw components, and the assembly is also carried out with extra care, and the assembly process is completely carried out, so this possibility is also ruled out.

3. The stroke of the machine tool is overtraveled, and the workbench collides, resulting in damage to the accuracy.

Overtravel occurs when operating the machine tool, which is easy to cause the collision of the machine tool. However, it is understood that there is no problem with the travel limit switch of the machine tool, and the user has no feedback in this regard.

4. The detection method is incorrect, resulting in the accuracy being out of tolerance.

The inspector uses the dial gauge with the magnetic gauge base, and uses the linear guide slide of the workbench as the test benchmark for testing, and the test method and test benchmark also meet the requirements. Hood burns hail.

5.Insufficient lubrication.

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Founded in 2005, Shanghai Sijiangli Transmission Machinery Co., Ltd. is a veteran supplier of professional transmission components engaged in ball screws, linear guide rails and bearings, and its service industry involves many fields such as semiconductors, automobiles, new energy, medical treatment, electronic 3C, machine tools, injection molding machines, etc., with many years of industry experience and a group of excellent transmission components team, which can provide a series of professional services from the early stage of technology selection - design - processing - testing - installation guidance - after-sales maintenance. In order to better serve customers, in 2018, we invested 20 acres of plant in Yancheng, Jiangsu Province, which integrates warehousing, lead screw shaft end processing, guide rail cutting, and integrated testing.

For customers in the machine tool industry, our company has a large number of inventory, and combined with the factory's own back-end processing capabilities, we can provide customers in the machine tool industry with all kinds of ball screws, linear guides, bearings and other spare parts in a short period of time, and emergency customers provide customers with maintenance services, greatly reducing the loss of production caused by machine tool shutdown to the factory, and winning unanimous praise from the industry.

Oak Features:

Zheng Qin 1. High transmission efficiency: The transmission efficiency of the ball screw pair is very high, up to 92% to 98%, which is 2 to 4 times that of ordinary screw transmission.

2. High positioning accuracy and repeated positioning accuracy: the driving torque of the ball screw pair is reduced to about one-third of the sliding screw, the heating rate is greatly reduced, and the temperature rise is reduced. And when installing the ball screw pair, measures such as eliminating the axial clearance in the preload mode are taken, so that the ball screw pair has high positioning accuracy and repeated positioning accuracy.

3. Long service life: The ball screw pair is made of high-quality alloy steel, so its actual life is much higher than that of the sliding screw, so as to make up for the shortcomings that its manufacturing cost is higher than that of the sliding screw.

4. High stiffness: the axial clearance can be eliminated after the ball screw pair is preloaded, and the stiffness of the beam cluster is high.

5. Reversibility of transmission: The ball screw pair eliminates the creeping phenomenon that may occur in the transmission process, and can realize the two transmission modes of converting rotary motion into linear motion or converting linear motion into rotary motion and transmitting power.

Figure 3-6 shows the structural principle of the ball screw nut pair. There are semi-circular arc-shaped spiral grooves on the lead screw 3 and nut 1, and when they are set together, the nut raceway of the ball is formed. There is a ball circuit pipe 4 on the nut, and the two ends of several circles of nut raceways are connected to form a closed circulating raceway, and balls 2 are filled in the raceway.

When the lead screw rotates, the ball rotates in the raceway and circulates along the raceway, thus forcing the nut to move axially is basically rolling friction, so it has the following characteristics.

The transmission efficiency is high, and the wear loss is small. The transmission efficiency of the ball screw nut pair is u0 92 0 96, which is 3 4 times higher than that of the conventional nut pair. Therefore, the power consumption is only equivalent to 1 4-1 3 of the conventional lead screw nut pair.

Proper preload can eliminate the thread gap between the lead screw and the nut, and the dead zone of the idle stroke can be eliminated when reverse, with high positioning accuracy and good stiffness.

The movement is stable, there is no crawling phenomenon, and the transmission accuracy is high.

It is reversible, and can be converted from rotary motion to linear motion and from linear motion to rotary motion, that is, both the lead screw and the nut can be used as active parts.

Low wear and tear and long service life.

The manufacturing process is complex and costly. Elements such as ball screws and nuts require high machining accuracy and high surface roughness, so the manufacturing cost is high.

Cannot self-lock. Especially for the vertical lead screw, due to the effect of its own weight, when the transmission is cut off when descending, it cannot stop moving immediately, so it is often necessary to add a braking device.

1. High transmission efficiency and low friction loss.

2.High sensitivity, stable transmission, not easy to produce low-speed crawling phenomenon, high follow-up accuracy and positioning accuracy.

3.Low wear, long life, good accuracy retention.

4.Proper preload can eliminate the thread gap between the lead screw and nut, and the idle dead zone can be eliminated by reversing, improving the reverse transmission accuracy and axial stiffness.

5.The movement is reversible, so it cannot be self-locking, and the braking device should be added when the wire is vertical.

6. The manufacturing process is complex and the cost is high.

Preload prevents the balls from slipping. The self-locking performance of the ball screw nut pair is poor, and it can be said that there is no, and it is easy to fall off without preloading.

Principle: form a spiral channel, and the raceway is filled with balls, when the screw rod is rotated relative to Luo Nu, the axial displacement occurs between the two, and the ball can flow along the raceway to reduce friction resistance, after the ball rolls several times on the screw mandle, through the return guide device, roll back between the screw and the nut one by one, forming a closed loop pipe.

Features: Ball screw nut pair is a high-precision transmission device. It replaces the sliding friction spiral with a rolling friction spiral, which has the advantages of low wear, high transmission efficiency, stable transmission, long life, high precision and low temperature rise.

Due to the outstanding advantages of low motion friction and easy elimination of transmission clearance, the ball screw nut pair brings great benefits to the performance improvement of mechatronic systems. Disadvantages: It cannot be self-locking, and a locking device is required when it is used for lifting transmission.

Well, to put it simply, it will be a little loose when you turn the nut by hand without pretension.

Not all ball screws are preloaded, mainly to see the accuracy requirements, the general preload accuracy is high, and the load capacity is also large. The preload is graded, and the selection is based on the requirements of use, and the samples of different brands can be checked.

Reduce the clearance of the ball screw.

Overview of how ball screws work Ball screws are ideal products for converting rotary motion into linear motion, or for converting linear motion into rotary motion. Choose high-quality ball screws to identify Tihao, professional quality assurance, because professional, so excellent! The ball screw is composed of a screw, a nut, a steel ball, a pre-pressed sheet, a reverser, and a dust preventer.

Its function is to convert the rotational motion into linear motion, which is a further extension and development of the Eckham screw, and the significance of this development is to change the bearing from a sliding action to a rolling action. Due to their low frictional resistance, ball screws are widely used in various industrial equipment and precision instruments. Ball screw is the most commonly used transmission element in machine tools and precision machinery, its main function is to convert rotary motion into linear motion, or torque into axial repetitive force, while having the characteristics of high precision, reversibility and high efficiency.

The principle of ball screw transmission is: the ball screw is used as the active body, and the nut will be converted into linear motion according to the lead of the corresponding specification with the rotation angle of the screw, and the passive workpiece can be connected by the nut seat and the nut, so as to achieve the corresponding linear motion.

The function of a ball screw is to turn the rotational motion into a linear motion, or to turn the linear motion into a rotary motion. Rotational MotionHuawei Linear Motion Principle is: when the screw (nut) rotates, the nut is a closed cycle, the lead screw is an open cycle, in the process of circulation, the nut (lead screw) is fixed on the equipment, the nut will be along the raceway of the lead screw to a relative motion, and at the same time will drive the parts to move.

Converting linear motion into rotational motion can be understood in reverse.

Working principle of ball screw nut:

The lead screw and nut are machined with arc-shaped spiral grooves, and when they are packed together, a spiral raceway can be formed, and the raceway is filled with balls, and when the lead screw makes a rotational motion relative to the nut, the axial displacement occurs between the two. The balls, on the other hand, can be rolled along the raceway. Reduces frictional resistance.

After the ball has been rolled on the screw several times, it passes through the return guide device (ball returner).Roll back between the lead screw and nut one by one. Constitutes a closed loop pipe.

When transmitting, there is basically rolling friction between the ball, the screw and the nut. Therefore it has the following advantages:

1) High transmission efficiency.

The transmission efficiency of the ball screw pair is very high, up to 92% 98%, which is 2 4 times that of ordinary lead screw transmission.

2) High positioning accuracy and repeat positioning accuracy.

The driving torque of the ball screw pair is reduced to about 1 3 of the sliding screw, the heating rate is greatly reduced, and the temperature rise is reduced. And when installing the ball screw pair, take measures such as eliminating axial clearance in a preload mode. The ball screw pair has high positioning accuracy and repeated positioning accuracy.

3) Long service life.

The ball screw pair is made of high-quality alloy steel, and its raceway surface has a hardness of up to 60 HRC after quenching and heat treatment, so its actual life is much higher than that of the sliding screw, so as to make up for the shortcomings that its manufacturing cost is higher than that of the sliding screw.

4) High stiffness.

The ball screw pair can be preloaded to eliminate axial backlash and improve the stiffness of the system.

5) Reversibility of transmission.

The ball screw pair eliminates the creeping phenomenon that may occur during the transmission process, and can realize two transmission modes: converting rotary motion into linear motion or converting linear motion into rotary motion and transmitting power.