We all know that the bed and the machine-tool transmission system directly affect the rigidity of the entire machine tool. The machine tools with different rigidity directly affect the accuracy, the efficiency of production, the stability of the treatment of machines and the lifespan of the whole machine during the processing of products.
So what material should be selected as a machine-tool bed material to improve the overall rigidity of the machine tool?
Here are some comparisons of several bed tool materials commonly used:
Welding structure | |
advantage | default |
High form stability | Withdrawal during welding |
High traction resistance | Residual constraint causes microstructure changes |
High vibration damping is provided by the design of friction damping plates | Potential risks due to possible internal cracks and brittle structures |
Design flexibility | Higher cost compared to the cast iron bed |
No additional cost of mold | No self-lubricating |
Light structure |
|
cast iron | ||
advantage | default | |
High form stability | Crisp that steel | |
High compression resistance | Low tensile resistance | |
High shock absorption |
| |
Good thermal conductivity, thermal expansion coefficient101/10 ^ 6k The finishing process can correct thermal drift. | The melting has a preheating phase | |
Good self-lubricating | High flow cost | |
Due to the storage structure of trace oil, it does not rust | Material weight, density7.20g / cm3 Lighter than artificial granite beds because they can be used3Thin thickness of the wall. |
|
Artificial granite | |
advantage | default |
High form stability | Crisp that cast iron |
| Low resistance to compression and traction |
High shock absorption | Potential risks due to possible internal cracks and brittle structures |
Low thermal conductivity, good thermal stability, thermal expansion coefficient 2.91/10 ^ 6k | Metal components such as guide rails affect the performance of their advantages. Due to the presence of different expansion coefficients, this means that stress and deformation can occur. The overall increase in temperature is very slow, which means that the size change will hardly stop. |
| No self-lubricating |
Do not rust | The material is lighter than melting and density is2.70 g / cm3To obtain the same rigidity, it must be used in relation to the cast iron3The material is twice as heavy as the overall weight. |
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