Reconditioned hollow bars are composed of mechanical components. Therefore, the design of the reconditioned hollow bars and whether they meet the aforementioned basic requirements will play a decisive role in the quality of the design. To this end, the following basic requirements should be proposed for the components of the reconditioned hollow bars.
Strength, stiffness, and life requirements
Strength refers to the ability of a part to resist damage. Insufficient part strength can lead to excessive plastic deformation and even fracturing, causing second-hand hollow wire to cease operation or even result in severe accidents. The use of high-strength materials, increasing the cross-sectional size of parts, designing the cross-sectional shape reasonably, employing heat treatment and chemical processing methods, enhancing the manufacturing accuracy of moving parts, and properly arranging the relative positions of various parts within the machine all contribute to improving part strength.
Stiffness refers to the ability of a component to resist elastic deformation. Insufficient component stiffness can lead to excessive elastic deformation, causing load concentration, affecting the performance of hollow shafts, and even leading to accidents. For example, in machine tools, such as the main spindle and guide rails, if the stiffness is insufficient and deformation is excessive, it can severely impact the accuracy of the components being added. There are two types of component stiffness: overall deformation stiffness and surface contact stiffness. Measures such as increasing the cross-sectional size of the component or its moment of inertia, shortening the span of the bearing, or using a multi-point structure can help improve the overall stiffness of the component. Increasing the mating surface area and employing fine machining techniques can enhance the contact stiffness. Generally speaking, components that meet stiffness requirements also meet their strength requirements.
Life span refers to the duration for which a part operates normally. Factors affecting the life span of parts include material fatigue, corrosion, wear from relative movement of contacting surfaces, and deformation of parts under high temperatures. Key measures to enhance the resistance of parts to fatigue failure include reducing stress concentration, ensuring parts have sufficient size, and improving the surface quality of parts. To improve the corrosion resistance of parts, primary measures involve selecting corrosion-resistant materials and implementing various anti-corrosion surface protection measures.
