咱們直接進入正題，聊聊滾珠絲桿這玩意兒的設計和選型。別看他名字挺機械，里面的門道可不少。上回咱們聊了滾珠絲桿的基本原理，就是靠那些小鋼珠在絲杠和螺母之間滾來滾去，把旋轉運動變成直線運動，效率高，摩擦小。聽起來是不是挺簡單的？但魔鬼都在細節里。今天咱們就來扒一扒怎么根據實際需求給他選個合適的型號，這可是個技術活。

　　Let's get straight to the point and talk about the design and selection of ball screws. Don't be fooled by his mechanical name, there are quite a few tricks inside. Last time we talked about the basic principle of ball screws, which relies on small steel balls rolling back and forth between the screw and nut to convert rotational motion into linear motion, with high efficiency and low friction. Does it sound quite simple? But the devil is in the details. Today, let's explore how to choose a suitable model for him based on actual needs. This is a technical task.

　　咱們先來看兩種常見的應用場景：水平和垂直。你看這張圖，像不像工廠里那些大家伙？水平安裝的時候主要得考慮工作臺的摩擦力，還有加工時產生的切削力。公式就是 F 等于 mu 乘以 N 加 FC，簡單粗暴對吧？但一旦變成垂直安裝，比如這個升降平臺，那可就麻煩了。除了剛才那些力，還得加上一個重量級選手：重力。你想想，幾千斤的東西掉在那兒，光是往下掉的勁兒就夠你受的。而且升降過程中啟動停止加速，慣性力也得算進去。所以你看，垂直工況下的推力計算那可不是簡單加個數就能完事的。系數必須得留足！不然掉下來可不是鬧著玩的。

　　Let's first take a look at the two most common application scenarios: horizontal and vertical. Do you think this picture looks like those big guys in the factory? When installing horizontally, the main considerations are the friction of the workbench and the cutting force generated during machining. The formula is F equals mu multiplied by N plus FC, which is simple and crude, right? But once it becomes a vertical installation, such as this lifting platform, it will be troublesome. In addition to the forces just now, we also need to add a heavyweight player: gravity. Think about it, thousands of pounds of things falling there, just the force of falling is enough for you to endure. And during the lifting process, starting and stopping acceleration, inertia force must also be taken into account. So you see, the calculation of thrust under vertical working conditions is not just about adding a few numbers. The safety factor must be sufficient! Otherwise, falling down is not a joke.

　　這張表總結的挺好，咱們細品一下。水平工況主要就是跟外力較勁，比如切削力，摩擦力，還有啟動加速時的慣性力。島城可以大一點，追求速度。但電機扭矩和系統剛性得跟上。預壓一般中等就行，C3級平衡精度和壽命。但如果負載特別大，那就得上 c5預壓了。再看垂直工況，那簡直就是跟重力死磕。的挑戰就是防止負載自己滑下來，所以必須用高預壓螺母把間隙徹底掉，不然定位精度就沒法保證。震動一來精度更是雪上加霜。島城的選擇也得悠著點，不能光圖快得考慮自鎖性，不然斷電或者意外情況，那后果不堪設想。

　　This table summarizes quite well, let's take a closer look. Horizontal working conditions mainly involve competing with external forces, such as cutting force, friction force, and inertial force during acceleration. Island city can be bigger, pursuing speed. But the motor torque and system rigidity need to keep up. Preloading is generally moderate, with C3 level balance accuracy and lifespan. But if the load is particularly large, then C5 preloading is required. Looking at the vertical working condition again, it's like a collision with gravity. The biggest challenge is to prevent the load from slipping off on its own, so it is necessary to use high preload nuts to completely eliminate the gap, otherwise the positioning accuracy cannot be guaranteed. The vibration makes the accuracy even worse. The choice of island city also needs to be taken lightly, and we cannot just focus on speed. We need to consider self-locking, otherwise the consequences of power outages or unexpected situations will be unimaginable.

　　接著看電機扭矩和設計這塊。水平工況下，電機主要負責加速和克服摩擦扭矩，要求相對溫和。但垂直工況就不一樣了，電機不僅要加速，還得時刻對抗著重力持續輸出扭矩，而且還得有足夠的保持扭矩。不然負載稍微有點晃動，他就得趕緊剎住。所以，垂直工況對電機的要求更高。方面，水平工況一般沒啥特別的，頂多擔心點灰塵啥的。但垂直工況問題就凸顯出來了，不能掉鏈子。必須加裝制動器，要么是電機自帶的，要么是外部的，確保斷電后能穩穩的停住，防止意外發生。效率方面，雖然兩種工況都有影響，但垂直工況因為要持續對抗重力效率的損失會直接影響到電機功率的選擇和制動器的發熱量。這點千萬不能忽視。

　　Next, let's take a look at the motor torque and safety design. Under horizontal working conditions, the motor is mainly responsible for accelerating and overcoming frictional torque, requiring relatively gentle operation. But the vertical working condition is different. The motor not only needs to accelerate, but also needs to continuously output torque against gravity at all times, and has sufficient holding torque. Otherwise, if the load shakes slightly, he will have to brake quickly. So, vertical working conditions have higher requirements for the motor. In terms of safety, there is generally nothing special about horizontal working conditions, at most there is a concern about dust and other things. But the safety issue of vertical working conditions has become prominent, and the chain must not fall off. It is necessary to install a brake, either built-in to the motor or external, to ensure a stable stop after power failure and prevent accidents. In terms of efficiency, although both operating conditions have an impact, the vertical operating condition will directly affect the selection of motor power and the heat generation of the brake due to the continuous resistance to gravity and the loss of efficiency. This must not be ignored.

　　說了這么多，到底該怎么一步步選呢？得判斷工況類型是水平還是垂直？受力方向是啥？靜載荷還是動載荷？這就像看病，先得診斷清楚病癥。然后是軸向載荷計算，這是核心中的核心。要把工作臺的重量，切削力，加速度產生的力等等都算進去。別忘了考慮摩擦系數和效率損失。算出來的總載荷 F 總是后續選型的基礎。一步就是根據算出來的 F 總去匹配滾珠絲桿的額定，動載和 CA 找到合適的型號。但這還沒完，還得驗算幾個關鍵參數，比如臨界轉速轉速太高，死桿可能失穩。還有壓感穩定性，尤其是在垂直工況下別選了個細長的絲桿，結果被壓彎了。整個流程下來，環環相扣，一步都不能錯。

　　After all that has been said, how should we choose step by step? Firstly, it is necessary to determine whether the working condition type is horizontal or vertical? What is the direction of force? Static load or dynamic load? It's like seeing a doctor, you have to diagnose the illness first. Then there is the calculation of axial load, which is the core of the core. We need to include the weight of the workbench, cutting force, acceleration generated force, and so on. Don't forget to consider the friction coefficient and efficiency loss. The calculated total load F is always the basis for subsequent selection. The final step is to match the rated, dynamic load, and CA of the ball screw based on the calculated F total to find the appropriate model. But that's not all, we still need to verify several key parameters, such as the critical speed being too high, which may cause the dead rod to become unstable. There is also pressure stability, especially when choosing a slender screw under vertical working conditions, which resulted in being bent. Throughout the entire process, every step is interconnected and cannot be wrong.

　　理論講完了，咱們來看幾個實際案例。比如數控機床的 Z 軸，通常都是垂直安裝的滾珠絲桿，那自重補償，防逆轉裝置這些就必不可少。不然加工精度和設備就沒法保證。再看自動化設備，很多是水平應用，這時候導向機構的設計和防塵密封性能就變得非常重要。畢竟水平運動容易積灰，導向不好，還容易跑偏。當然怕的就是選型錯誤。比如，忽略了臨界轉速計算結果，高速運轉時絲桿直接散架。或者沒考慮溫度補償，環境溫度變化導致絲感膨脹，收縮，影響精度甚損壞。還有潤滑方式選不對？該加油的地方沒油，不該有的地方油太多都會出問題。這些都是血淚教訓。

　　The theory is finished, let's take a look at a few practical cases. For example, the Z-axis of a CNC machine tool is usually a vertically installed ball screw, so self weight compensation and anti reverse devices are essential. Otherwise, the machining accuracy and equipment safety cannot be guaranteed. Looking at automation equipment again, many of them are used horizontally, and at this time, the design of the guiding mechanism and the dust-proof sealing performance become very important. After all, horizontal exercise is prone to accumulation of dust, poor guidance, and easy deviation. Of course, the biggest fear is the selection error. For example, ignoring the calculation results of critical speed, the screw rod directly breaks apart during high-speed operation. Or without considering temperature compensation, changes in environmental temperature can cause silk to expand, contract, affect accuracy, and even damage. Is the lubrication method chosen incorrectly? There is no fuel in the areas that should be refueled, and excessive fuel in some areas can cause problems. These are all painful lessons.

　　關于滾珠絲桿的設計選型，今天就先聊到這里。希望這些內容能幫大家更好的理解和應用這項技術。如果需要更深入的學習資料或者筆記，可以關注我，評論區留言久久，。當然，有任何疑問或者想吐槽的地方，也歡迎隨時留言，我會盡力解答。

　　That's all for today's discussion on the design and selection of ball screws. I hope these contents can help everyone better understand and apply this technology. If you need more in-depth learning materials or notes, you can follow me, leave a long comment in the comment section, and receive them for free. Of course, if you have any questions or want to roast, please leave a message at any time. I will try my best to answer them.

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