With the development of industry, especially the development of manufacturing, the share of welded structural parts and copper and aluminum castings in the market is quite. Obviously, the application range of welded structural parts has been expanded, because it has the advantages of short production cycle, light weight, relatively simple equipment required, and fast modification. It is favored by manufacturers. So is it better to make copper and aluminum castings or welded structural parts? As a structural part on the machine tool, it often has to bear a large load. Take the beam of the gantry machining center as an example. The beam must bear gravity, tension, torsion, etc., in order to reduce deformation, the beam needs to have better Of stiffness. The material used for welding parts is carbon steel, and its elastic modulus and mechanical properties are much better than the copper-aluminum materials used for copper-aluminum castings. In other words, under the same stress, we can make the cross-section of the beam smaller. Because the span of the beam is larger, the weight reduction by reducing the cross-section is considerable, and the weight is reduced. The amount of sag of the beam is reduced, so that the use of welded parts not only ensures the rigidity of the machine, but also ensures the static geometric accuracy of the machine. Because the E value of the material used for the weldment is large, the static stiffness of the weldment is relatively large bronze cast factory under the same load. In this way, if the workpiece is forced to vibrate, increasing the static stiffness of the object can reduce the amplitude of the object, and also increase the natural frequency of the object, thereby reducing or avoiding the occurrence of resonance. For self-excited vibration, increasing the static stiffness can increase the limit of self-excited vibration stability. Because the elastic modulus and mechanical properties of copper and aluminum materials are greater than carbon steel materials, under the premise of the same rigidity, the weight of copper and aluminum castings can be much lighter than that of welded structures, so reducing the weight increases the natural frequency and reduces the probability of resonance. Or avoid. In addition, the vibration absorption performance of copper and aluminum castings is better than that of welded parts. Because the internal damping of castings is much higher than that of carbon steel on average, so in general, the vibration absorption performance of welded parts is almost the same as that of copper and aluminum castings. Analytical methods, scientific calculations, and reasonable layout. The vibration absorption damping of such copper-aluminum castings is much higher than that of welded parts. Of course, its vibration absorption performance is better than welded parts.
