Archive for category: Product News

Rust treatment and antirust method of linear guide rail. As one of the core components of the equipment, the linear guide rail and the linear shaft play a guiding and supporting role. In order to ensure the high machining accuracy of the machine, it is required that the guide rails and straight lines have high guiding accuracy and good motion stability.

During the operation of the equipment, a large amount of corrosive dust and smoke will be produced during the processing of the machined parts, which will be deposited on the surfaces of guide rails and linear shafts for a long time, which will greatly affect the machining accuracy of the equipment.

And corrosion spots will be formed on the surface of the straight axis of the guide rail, thus shortening the service life of the equipment. In order to make the machine work normally and stably and ensure the processing quality of products, the daily maintenance of guide rails and linear shafts should be done carefully.

Please prepare for cleaning the guide rail-dry cotton cloth and lubricating oil. For example, the guide rail of engraving machine is divided into linear guide rail and roller guide rail. Cleaning of linear guide rail: firstly, move the laser head to the right (or left), find the linear guide rail, wipe it with dry cotton cloth until it is bright and dust-free, add a little lubricating oil (sewing machine oil can be used, but not engine oil), and slowly push the laser head left and right several times, so that the lubricating oil can be evenly distributed.

Cleaning of straight guide rail: move the beam to the inside, open the end covers on both sides of the machine, find the guide rail, wipe the contact areas between the guide rails on both sides and the rollers with dry cotton cloth, and then move the beam to clean the remaining areas. After finishing the use of the linear guide rail, it is necessary to apply anti-rust oil on its surface again.

1. The accuracy grades of linear guide rail are divided into (walking parallelism, taking the guide rail 100mm long as an example), general grade (unmarked /C)5μm, (H)3μm, precision grade (P)2μm, precision grade (SP)1.5μm and precision grade (UP)1μm according to the use of different machines. Preload the slider. Generally, preloading is divided into medium preloading and heavy preloading without preloading. The greater the preloading, the better the rigidity. Load: Generally, at the beginning of selection, it is concluded that 1/3 of rated dynamic load is the upper limit of practical load. Therefore, it is generally ensured that there is no sinking when it is added to medium preloading. If the guide rail is used up and down, it will play a guiding role. How much the slider rises is related to the screw or other transmission methods used, but not to the slide rail and slider.

2. There are basically three kinds of different brands. Usually, the gap effect of light preloading and medium preloading can affect the walking accuracy, load bearing ability and rigidity of the guide rail. And the guide rail with gap is selected, which can reduce the oscillation and impact caused by reciprocating motion to a certain extent.

3. When loading, the slider won’t sink much, so it should be called elastic deformation. If you want to say how much, no guide rail material is marked now, because it can be neglected.

Screw rod is one of the common product components of large-scale machinery, and its importance has been well known by more and more people. For example, people engaged in industrial mechanization also regard screw rod as a sign that the machine can run stably and normally. It can be seen that its functionality is relatively strong, mainly in the following industries:

In the electronic and mechanical industry, there are many equipments that use screw rods, such as measuring instruments, which have high requirements for measuring accuracy.

In the field of machinery, it has a wide range of products, because in the machinery industry, machinery has high requirements for the processing of each workpiece, whether it is milling machine, grinding machine, drilling machine, lathe, etc., as long as it is used, the precision error is generally below 0.1 mm.

Screw rod is also widely used in the field of numerical control, and many CNC mechanical equipment are large, which can realize automatic processing, but this will not affect its processing accuracy at all; However, with its application, the linear motion and reciprocating motion of CNC machining machinery can be freely converted, and the machining accuracy is also guaranteed.

As we all know, in the process of running the screw rod, the temperature will rise more or less, and the shaft will stretch due to thermal expansion, resulting in positioning accuracy error. Therefore, under the condition of strict positioning accuracy, corresponding cooling measures should be taken:

1. On the premise of meeting product requirements, minimize the pre-tightening amount of screw rod and bearing seat;

2. Choose a large lead as much as possible to reduce the rotating speed;

3. It is very important to choose suitable lubricant.

4. If conditions permit, use lubricating oil or cold air to forcibly cool the screw shaft.

To sum up, the above four measures can prevent the screw from generating high temperature in operation.

The problems caused by ball screw are various, and there is no fixed form. The ball screw shaft or nut sometimes falls off due to its own weight, and when it falls off carelessly, it may cause the loss of product function due to the collision of track or the damage of circulating parts. At this time, it needs to be checked by the company. If there are scars and damages on circulating parts, outer diameter of shaft, track, etc., it will cause poor circulation, which will lead to the loss of product function. Only through correct detection to determine the real cause of the problem, can it be repaired quickly and accurately.

If there is no preparation and inspection before operating the ball screw, there may be faults. In order to reduce the occurrence of faults, how should everyone prepare for the normal operation of the ball screw? For the axis of rotation of ball screw, we should ensure that it is parallel to the linear guide rail of the main base of the machine tool, so as to avoid affecting the machining quality of ball screw due to imbalance.

For single nut ball screw, the gap between screw and nut pair cannot be adjusted. If it is detected that there is a gap between the lead screw and nut pair. First, check whether the thread arcs of the lead screw and nut are worn. If the wear is serious, a complete set of lead screw nuts must be replaced. Whether the axis line of ball screw nut can be coaxial with the hole of the motor seat can also directly affect the movement process of the machine tool.

If noise and vibration are generated in the work of machine tools, the problem of poor lubrication should be considered first after detecting that there is no problem in the mechanical transmission part. After many years of operation of machine tools, the automatic lubrication system of lead screw and nut is often blocked and cannot be lubricated automatically. Grease with high temperature resistance and high speed resistance can be added to bearings and nuts to solve the problem. Grease can ensure the normal operation of bearings and nuts for several years.

In the daily use of transmission parts, for the fluid lubrication of sliding guide rail surface, the movement accuracy error caused by the floating of oil film is inevitable. In most cases, fluid lubrication is limited to the boundary area, and direct friction caused by metal contact is inevitable, in which a large amount of energy is wasted by friction loss. On the contrary, because of the low friction energy consumption and the corresponding reduction of friction loss on the rolling surface, the linear guide rail system can be in a high-precision state for a long time. At the same time, due to the small amount of lubricating oil, grease lubrication is enough in most cases, which makes it very easy to design and maintain the lubrication system of machine tools.

There is a slight or negative gap between the slider of the rolling linear guide rail and the guide rail, so the overall rigidity and movement accuracy of the guide rail can be greatly improved. The E2 self-lubricating module product with innovative design of linear guide rail combines the concept of removable type, which makes the linear guide rail extend its maintenance cycle. E2 self-lubricating module is characterized by cost saving, cleanness and environmental protection, flexible installation, convenient disassembly and assembly and easy maintenance. The transparent oil tank design can check the oil quantity at any time, and the corresponding lubricating oil can be selected. It can be used in special environment such as dust, bad weather and water environment.

In order to improve the motion accuracy and accuracy maintenance, linear guideway requires enough negative numbers, which are two contradictory aspects. When the working time is too long, the steel balls begin to wear, and the preload acting on the steel balls begins to weaken, which leads to the decrease of the motion accuracy of the working parts of the machine tool. If you want to keep the initial accuracy of the linear guide, you must replace the guide bracket or even the guide. If the guide rail system has been preloaded. The accuracy of the system has been lost,  and the only way is to replace the linear slider and guide rail.