Archive for category: Product News

When choosing the linear guide rail of linear module, we should choose the appropriate size according to the working environment, and choose the appropriate product while ensuring the accuracy. Besides, the correct installation and lubrication protection of the guide rail are also very important.

1. High guiding accuracy: the guiding accuracy refers to the linearity of moving parts along the guide rail and the accuracy of the relative positions between the base surfaces.

2. High enough rigidity: The external force on the moving parts is borne by the guide rail surface, so the guide rail should have high enough rigidity. Therefore, we often increase the width of the guide rail surface to reduce the specific pressure of the guide rail surface, and set up auxiliary guide rails to bear the external load.

3. Smooth and light movement of the guide rail: When the linear guide rail works, it should be light and labor-saving, with uniform speed, and there should be no crawling phenomenon at low speed.

4. The structural manufacturability of the guide rail is good: on the premise of ensuring other requirements of the guide rail, the structure of the guide rail should be simple to facilitate processing, measurement, assembly and adjustment, so as to reduce the cost. The guide rails used by different equipments must be analyzed in detail, and corresponding design requirements should be put forward.

5. Good wear resistance: The wear resistance of the guide rail is to guide the rail to maintain a certain accuracy after long-term use. The guide rail will be worn during use, but the amount of wear should be small, and it can be automatically compensated or easily adjusted after wear.

6. High adaptability to temperature change: the linear guide rail of linear module should still work normally under the condition of changing working temperature.

At present, with the high speed of the machine tool industry, the load on the ball screw is increasing, and the high-precision and large-lead screw is very necessary. Therefore, the ball screw has become an indispensable part of the machine tool. The maintenance method of the ball screw is generally the same as other devices to prevent dust and dryness, which affects work efficiency and prevents accident risks. Doing the following points can more effectively improve the service life:

(1) Eliminate the axial clearance. After the ball screw pair is disassembled and assembled, in order to ensure the accuracy of the reverse transmission and the axial rigidity, the axial clearance must be eliminated. The method of double nut ball screw pair to eliminate the gap is to use the relative axial displacement of the two nuts to make the balls in the two ball nuts stick to the two opposite sides of the threaded raceway respectively. When using this method to pre-tighten to eliminate the axial gap, it should be noted that the pre-tightening force should not be too large, otherwise it will increase the no-load moment and reduce the transmission efficiency.

(2) Regularly check the lubrication of the ball screw pair. Can be lubricated with grease and lubricating oil. Grease is generally added to the threaded raceway and the housing space where the nut is installed, and the lubricating oil is injected into the space of the nut through the oil hole on the housing. The grease on the ball screw should be replaced every six months, the old grease on the screw should be cleaned, and new grease should be applied. The ball screw pair lubricated with lubricating oil can be oiled once before each machine tool work.

(3) Protect the ball screw pair. The ball screw pair should be protected from dust or chips and closed, such as spiral spring steel belt casing, telescopic casing or folding casing. When installing, connect one end of the protective cover to the end surface of the ball nut, and fix the other end to the support seat of the ball screw.

If the ball screw is in a hidden position, a sealing ring can be used for protection, and the sealing ring can be installed on both ends of the nut. The contact seal ring has a good dust-proof effect, but due to the contact pressure, the friction torque is slightly increased. Non-contact sealing can avoid friction torque, but the dustproof effect is slightly worse. Avoid hitting the protective device when working, and replace the protective device in time if it is damaged.

(4) Regularly check the supporting bearings. Regularly check whether the connection between the screw support and the bed is loose, and whether the support bearing is damaged. If there is any problem, fasten the loose part and replace the supporting bearing in time.

Reasons affecting the normal use of ball screw. One of the reasons for the unsmooth running of the ball screw can be divided into two situations. One is that during shipment, many packing materials and anti-bagging packing ball nuts, and when the screw is packed or arranged with steel balls, there is no proper standard procedure to complete the execution. Foreign objects or other debris and other sundries will block the track of the steel balls, resulting in the packing materials blocking the track, thus affecting the running of the ball screw. Another possibility is that if the ball screw is installed without a brush scraper, the machining chips and dust will easily accumulate in the track and block the steel ball track during machining, thus causing the ball screw to run unsmooth. The internal circulation of the ball screw is realized by the reverser, but what factors will affect the operation of the ball screw when it is running?

1. When the nut is installed, it is inclined or eccentric, which will cause abnormal load on the screw rod and cause unstable voltage when the motor is running. Damage of ball screw during handling.

2. When using lead screw for machining, it should be operated according to strict procedures, especially during early installation. If the installation is not in place, it will affect the working accuracy of lead screw.

3. Whether the axial line of the ball screw nut can be coaxial with the hole of the motor seat will also affect the operation, so pay attention to the details during operation.

4. In addition, the quality of ball screw will also directly affect its accuracy during operation. Pay attention to its quality when selecting screw.

5. Rough surface of ball groove of screw or nut, uneven size or hardness of steel ball, incorrect assembly of return pipe, etc. can cause obstacles in the operation of screw rod.

Ball screw is a kind of high-precision component, its precision is reduced and its life is shortened, so it is necessary to ensure its normal operation.

1. Linear guide rail pair is generally composed of guide rail, slide block, reverser, rolling body and holder, etc. It is a new rolling support for relative reciprocating linear motion, which can replace direct sliding touch with steel ball rolling between slide block and guide rail, and the rolling body can complete infinite circulation in raceway and slide block by means of reverser, with simple structure.

2. Small dynamic-static conflict coefficient, high positioning accuracy, good accuracy persistence, etc. Linear guide rail, also known as fine rolling linear guide rail pair, slide rail, linear guide rail, linear slide rail and rolling guide rail, is used for linear reciprocating motion occasions requiring accurate control of walking parallelism of worktable, has higher rated load than linear bearing, can bear a certain torque together, and can complete high-precision linear motion under high load.

3. The function of the linear guide rail is to support and guide the moving parts, and the worktable is driven to move smoothly in a given direction to make reciprocating linear motion by two or four rows of balls on both sides of the guide rail. According to the nature of conflict, linear motion guide can be divided into sliding conflict guide, rolling conflict guide, elastic conflict guide, fluid conflict guide and so on.

Linear module is a mechanical equipment component commonly used in modern industry. Its appearance can be said to be the crystallization of mechanical development and transformation. It can be seen in the modern military industry, food industry, spraying industry, logistics industry and other industries. This is because it has more significant advantages compared with traditional mechanical systems. For example, its high precision, no empty return but almost zero maintenance (no contact parts), which is difficult for mechanical systems to achieve. What’s more, there are many other advantages such as very high speed, very low speed and high acceleration.

However, there will be some minor problems in the use of any machine, such as noise, and the linear module is no exception!

1. Noise is prone to appear in a dusty environment

Solution: Use a dustproof device when in use. Generally, manufacturers will have stocks; at the same time, when choosing a linear module, you should also give priority to a closed/dust-proof linear module, such as the following one, with a steel belt The screw slide table is more suitable for use in dusty environments. In addition to the dust-proof of the module itself, other dust-proof devices should also be set according to the size of the dust.

2. Different equipment requires different pre-pressure, so noise will also occur;

Solution: According to different equipment, technical adjustment of pre-compression is required before use.

3. The lubricating grease is different, there will be noise

Solution: According to different types of linear modules, select special lubricants.