HGH Linear Guideway Static Load Rating
In mechanical transmission and precision positioning system, HGH Linear Guideway is widely used due to its high rigidity, high precision and long life. Its static load rating as a key parameter, directly related to the guideway in the static or low-speed operating conditions of the load carrying capacity and reliability. In this paper, we will analyze the knowledge of HGR linear guide static load rating.
First, the definition of static load rating
HGR linear guide static load rating, refers to the static or very low speed (general speed less than 10mm/min) under the state of motion, the guide system can withstand for a long time and does not produce beyond the permissible range of permanent deformation of the maximum load value. Here the permanent deformation is usually rolling body (such as ball) and raceway contact with the amount of plastic deformation as a measure of standards, the general requirements of the total amount of plastic deformation does not exceed 0.0001 times the diameter of the rolling body. This parameter is the core index to assess the strength and stability of HGR linear guide in static conditions.
Second, the factors affecting the static load rating of HGR linear guide
1. The structural design of the guide
number of balls and layout: HGR linear guide more than four columns of ball design, the number of balls and the arrangement of the number of static load rating has a significant impact. More balls can disperse the load and improve the load carrying capacity. For example, under the same size specifications, an optimized ball layout can increase the static load rating by 10%-15%.
Raceway Shape and Size: Raceways are usually shaped as single or double arcs. The proper radius of curvature and depth of the raceway increases the contact area between the ball and raceway, reduces contact stresses, and thus increases the static load rating. For example, the static load rating can be increased by about 20% by optimizing the raceway dimensions for a specific type of HGR guideway.
2. Material Characteristics
Guide Body Material: HGR linear guide body is generally used high-quality alloy steel, such as S55C and so on. This type of steel after heat treatment, with high hardness (usually require HRC58-62) and good toughness. The high hardness enhances the rail's ability to resist deformation and increases the static load rating. If the hardness of the material is not enough, the static load rating will be reduced accordingly, up to 30% -50%.
Ball material: ball commonly used high carbon chrome bearing steel (such as SUJ2) manufacturing, its hardness and wear resistance directly affect the guideway load bearing performance. High-quality ball material can withstand higher static loads, to ensure the reliability of the guide in the long-term static load.
3. Manufacturing accuracy
Processing accuracy: the processing accuracy of the guide, including straightness, flatness, and ball and raceway fit accuracy, etc., has an important impact on the static load rating. High-precision machining can ensure that the load is evenly distributed between the balls and raceways to avoid localized stress concentration. For example, a guideway with straightness error control within ±0.002mm/m can increase the static load rating by 15%-20% compared to a guideway with larger error.
Assembly Accuracy: Accurate assembly ensures that the balls run smoothly in the raceway and that there is a tight fit between the components. Assembly errors can lead to uneven load distribution, reducing the static load carrying capacity of the rail. Good assembly process can make the static load rating close to the theoretical design value.
Examples of Static Load Ratings for Different HGR Linear Guideway Specifications
Take the common HGR15, HGR20, HGR25 and HGR30 models for example:
| Rail model: | Static load rating (Co, in kN) | Allowable static moment (Mr in kN-m) | Allowable static moment (Mr in kN-m) | Allowable static moment (Mr in kN-m) |
| HGR15 | 25.31 - 63.46 | 0.17 - 1.06 | 0.23 - 1.86 | 0.10 - 0.65 |
| HGR20 | 37.34 - 93.37 | 0.34 - 2.13 | 0.46 - 3.72 | 0.20 - 1.30 |
| HGR25 | 53.40 - 133.50 | 0.83 - 6.68 | 0.83 - 6.68 | 0.36 - 2.34 |
| HGR30 | 73.57 - 183.92 | 1.40 - 11.31 | 1.40 - 11.31 | 0.61 - 3.94 |
It should be noted that these values are theoretical reference values, the actual application, but also need to consider the working environment (such as temperature, humidity, dust, etc.), lubrication conditions and installation methods and other factors on the static load rating.
Fourth, the importance of static load rating in practical applications
1. Ensure the structural safety of equipment: in many mechanical devices, such as machine tools, table support, automated production lines, such as fixed load-bearing components, HGR linear guide needs to be subjected to static loads for a long time. Matching the static load rating of the working condition can make the guide rail resist the risk of overload in this kind of application, prevent the permanent deformation or structural damage caused by overloading, and build up a solid safety defense for the overall framework of the equipment to ensure the stability of operation.
2. Maintain equipment accuracy: When the actual static load breaks through the rated upper limit of the guide rail, even if there is no visible damage within a short time, it may cause the guide rail to produce subtle plastic deformation. This deformation can snowball over time, gradually eroding the accuracy of the equipment's movement - for example, leading to machine tools machining parts with excessive dimensional deviations, or making the positioning of automation equipment have an indiscernible, but affect the efficiency of the deviation. Therefore, according to the static load rating scientific selection, is the core premise of the equipment to maintain long-term high-precision operation.
3. Extend the service life of the guide rail: the use of HGR linear guide in the rated static load range can reduce the wear and tear between the ball and the raceway, reduce the risk of fatigue failure, thus significantly extending the service life of the guide rail, reduce equipment maintenance costs and downtime.
In summary, the static load rating of HGH linear guide is a comprehensive key parameter that involves the design, manufacture, materials and application of the guide. In the actual selection of HGR linear guide, must give full consideration to the static load rating, and combined with the specific conditions of reasonable selection and application, to ensure efficient and stable operation of the mechanical system.
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